feat: edit SQLite databases in the file manager - the agent opens them through SQLite: values by a click, rows added and deleted, an SQL tab; changes go to the audit log

README.md

@@ -1,74 +1,151 @@
 # LPRA - LongPolling Remote Access
 
 Лёгкий self-hosted сервис для доступа к Linux-машинам **без белого IP** (за NAT).
-Агент на клиенте сам исходяще подключается к серверу по HTTP long-polling; админ
+Агент на клиенте сам исходяще подключается к серверу - по WebSocket, а где он не проходит,
-в веб-панели видит список машин и открывает по каждой **терминал в браузере** (по умолчанию от root, пользователя можно сменить).
+по HTTP long-polling. В веб-панели видно список машин, и по каждой есть терминал в браузере,
+файловый менеджер, проброс портов и статус.
 
 ```
-браузер ──WS──> [nginx :8445 TLS] ──> [Go server 127.0.0.1:8091] <──long-poll── агент (root, за NAT)
+браузер ──HTTPS/WS──> [Cloudflare] ──> [nginx TLS] ──> [Go server 127.0.0.1:8091] <──WS / long-poll── агент (за NAT)
-                                          │
+                                                              │         ▲
-                                        SQLite
+                                                            SQLite      └──── прямой TCP/UDP-туннель :8446 (проброс tcp/udp)
 ```
 
+## Возможности
+- **Терминал** - вкладки на нескольких машинах сразу, до четырёх терминалов в одной вкладке
+  (перетаскиванием, с изменяемыми размерами), переименование вкладок. На телефоне - панель
+  клавиш (Esc, Ctrl, Alt, стрелки и т.д.).
+- **SSH-терминал** - в меню «+»: агент открывает SSH-соединение к другому хосту (по паролю,
+  ключу - можно загрузить файл - или своими ключами из `~/.ssh`), шелл открывается во вкладке,
+  а шаги подключения видны в статусе. Ключ хоста запоминается при первом входе
+  (`ssh_known_hosts` рядом с `state.json` агента); если он сменится, вход откажет.
+- **Файлы** - просмотр, редактор с подсветкой, hex-редактор, предпросмотр картинок, видео, PDF,
+  баз SQLite с правкой (значение по клику, добавление и удаление строк, вкладка SQL; агент меняет базу через сам SQLite, так что работающая база не ломается); загрузка и скачивание до 512 МБ кусками по 4 МБ (проходит через Cloudflare);
+  свойства (chmod/chown), zip/unzip.
+- **Перемещение и копирование** - внутри машины или, кнопкой «сеть» в том же окне, **на другую
+  машину или на SSH-хост**: папка уходит потоком tar без промежуточных файлов, с прогрессом,
+  скоростью и отменой. «Переместить» удаляет исходник после успешной отправки. Правила для
+  существующего: сообщить / заменить / оставить как есть.
+- **Проброс портов** - `http` через панель, `tcp`/`udp` через прямой туннель.
+- **Статус** - нагрузка, память, диски, сеть, тест скорости канала до сервера.
+- **Вход** - пароль и/или ключи доступа (passkeys); пароль можно выключить, когда есть ключ.
+- **PIN-код** (необязательный, 4 цифры) - спрашивается в каждой новой вкладке браузера, но не при
+  перезагрузке. На устройстве можно не спрашивать его 5/15/30/60 минут после ввода.
+  Пять неверных попыток - выход из сессии.
+
+## Пользователи и роли
+- **Администратор** видит всё: все машины, настройки, пользователей, ufw.
+- **Пользователь** видит только выданные ему машины (терминал, файлы, порты, статус, «Изменить» без удаления);
+  настроек, других пользователей и чужих машин для него нет.
+
+Роль и машины задаются в «Настройки → Пользователи» (квадратная кнопка у пользователя открывает список машин).
+Там же галочка «Пароль» включает или выключает вход по паролю (выключить можно, когда у человека есть ключ доступа),
+а «Закрепить» не даёт ему поменять это самому. Последнего администратора нельзя удалить или понизить.
+
 ## Компоненты
-- **Сервер** (`cmd/server`) - админ-панель + точка встречи для агентов. За nginx (TLS).
+- **Сервер** (`cmd/server`) - панель и точка встречи для агентов. Ставится за nginx (TLS).
-- **Агент** (`cmd/agent`) - Linux-бинарь, systemd-сервис от root, PTY по запросу.
+- **Агент** (`cmd/agent`) - бинарь для Linux (amd64/arm64), systemd-сервис от root.
-- **install.sh** - интерактивный установщик, отдаётся сервером как статика.
+- **install.sh** - установщик агента, отдаётся сервером.
 
 ## Сборка
 ```sh
 ./build.sh
 ```
-Получаются `bin/lpra-server` и `dist/agent-linux-{amd64,arm64}`.
+Получаются `bin/lpra-server*` и `dist/agent-linux-{amd64,arm64}`.
+Версия задаётся в одном месте - `VERSION.txt`, она вшивается в сервер и агент.
 
 ## Запуск сервера
 ```sh
 ./bin/lpra-server -addr 127.0.0.1:8091 -dist ./dist -db ./lpra.db
 ```
-Поставьте перед ним nginx по `deploy/nginx.conf.example` (TLS, long-poll/WS).
+| Флаг | Переменная | По умолчанию | |
-Локально без TLS можно добавить `-insecure-cookies`.
+|---|---|---|---|
+| `-addr` | `LPRA_ADDR` | `127.0.0.1:8091` | адрес HTTP (за nginx) |
+| `-db` | `LPRA_DB` | `lpra.db` | база SQLite |
+| `-dist` | `LPRA_DIST` | `dist` | бинарники агента для `/download/` |
+| `-tunnel` | `LPRA_TUNNEL_ADDR` | `:8446` | прямой туннель TCP+UDP (пусто - выключен) |
+| `-insecure-cookies` | `LPRA_INSECURE_COOKIES=1` | | куки без Secure - только для локального запуска без TLS |
 
-Первый запуск: откройте `/setup` - мастер создаст администратора. Дальше `/settings`:
+Пример юнита - `deploy/lpra-server.service`.
-адрес хоста (по умолчанию `https://localhost:8445`), enroll-секрет и готовая
-команда установки.
 
-## Установка агента на клиент
+Первый запуск: откройте `/setup` - мастер создаст администратора. Дальше в `/settings`:
-Одной командой (под root):
+адрес хоста, enroll-секрет, короткий код установки и готовая команда.
-```sh
+
-curl -fsSL https://localhost:8445/install.sh | sudo HOST=https://localhost:8445 ENROLL_SECRET=<секрет> sh
+### nginx
+Конфиг - `deploy/nginx.conf.example`. Обязательно:
+- заголовки `Upgrade` / `Connection` (через `map $http_upgrade $connection_upgrade`) - без них
+  WebSocket не пройдёт, и агенты и терминалы останутся на long-polling (работает, но медленнее
+  на больших выводах);
+- `proxy_read_timeout` больше 25 с (удержание long-poll), `proxy_buffering off`.
+
+### Прямой адрес (без Cloudflare)
+В «Настройки → Адрес хоста» можно задать второй, прямой адрес - например `https://direct.lpra.example.com`,
+DNS-запись без проксирования. Тогда:
+- агенты, не достучавшись до основного адреса 30 секунд, переходят на прямой и каждые 5 минут проверяют,
+  не ожил ли основной; уже установленные агенты получают прямой адрес с сервера сами (он хранится в `state.json`);
+- установщик берёт адреса с того домена, с которого его скачали: с основного - агент работает через основной
+  с резервом на прямой, с прямого - наоборот (и бинарник качается с прямого); если первый адрес не отвечает,
+  бинарник качается со второго. В «Полных вариантах» есть короткая команда и через прямой адрес;
+- в «Изменить → Связь с сервером» у клиента, подключённого через прямой адрес, после статуса стоит «(direct)»;
+- если хост туннеля не задан, агентам отдаётся хост прямого адреса;
+- ключи доступа основного домена работают и на его поддомене.
+
+### Cloudflare
+Работает за проксирующим Cloudflare: WebSocket он пропускает, файлы идут кусками меньше лимита
+на запрос, статика с хешем в имени кэшируется. Чтобы панель видела настоящие IP (ограничение
+попыток входа и кода установки считается по адресу), включите в nginx real IP:
+```nginx
+real_ip_header CF-Connecting-IP;
+set_real_ip_from 173.245.48.0/20;   # и остальные диапазоны с https://www.cloudflare.com/ips/
 ```
-Или интерактивно (спросит секрет, а если агент уже стоит - предложит удалить):
+Прямой туннель (`:8446`) - это не HTTP, через проксирующий Cloudflare он не идёт: в
+«Настройки → Прямой туннель» укажите для агентов IP хоста или DNS-имя без проксирования.
+
+## Установка агента
+Короткой командой из `/settings` (код из 3-24 букв и цифр, кнопка «Новый код» меняет его):
 ```sh
-curl -fsSL https://localhost:8445/install.sh | sudo sh
+curl -fsSL https://panel.example/i/<код> | sudo sh
 ```
+Или полной:
+```sh
+curl -fsSL https://panel.example/install.sh | sudo HOST=https://panel.example ENROLL_SECRET=<секрет> sh
+```
+Без параметров установщик спросит секрет, а если агент уже стоит - предложит удалить.
+Обновить агента можно кнопкой в панели («Изменить» → обновить).
+
+## Связь агента с сервером
+В «Изменить» → «Связь с сервером» для каждой машины:
+- **auto** (по умолчанию) - WebSocket; если он не подключается, long-polling ровно минуту, потом
+  снова попытка WebSocket;
+- **ws** - только WebSocket;
+- **lp** - только long-polling.
 
 ## Проброс портов и прямой туннель
-Правила проброса создаются на странице машины. Режим `http` идёт через адрес панели (long-poll),
+Правила создаются на странице машины «Порты». Режим `http` идёт через адрес панели,
-режимы `tcp`/`udp` - через прямой туннель: агент держит исходящее соединение к порту туннеля хоста
+`tcp`/`udp` - через прямой туннель: агент держит исходящее соединение к порту туннеля хоста,
-(флаг `-tunnel` / `LPRA_TUNNEL_ADDR`).
+по нему мультиплексируются все соединения.
 
-Порт туннеля и хост, к которому для него подключаются агенты (например, IP вместо домена панели),
+Порт туннеля и хост для агентов меняются в `/settings` → «Прямой туннель»; агенты забирают их
-меняются в `/settings` → «Прямой туннель». Агенты забирают адрес с панели сами - при подключении и
+сами, переустановка не нужна. Локальные `TUNNEL_ADDR` / `TUNNEL_PORT` в окружении агента имеют
-при каждом опросе, переустановка не нужна. Локальные `TUNNEL_ADDR` / `TUNNEL_PORT` в окружении агента
+приоритет (`TUNNEL_ADDR=off` отключает туннель).
-имеют приоритет над настройкой панели (`TUNNEL_ADDR=off` отключает туннель).
 
-Если на хосте активен ufw и сервер запущен от root, панель сама открывает порт хоста правила
+Если на хосте активен ufw и сервер запущен от root, панель сама открывает порты правил и порт
-(tcp для `http`/`tcp`, udp для `udp`) и порт туннеля для прямых режимов, а при удалении правила - закрывает.
+туннеля, а при удалении правила закрывает. При `ProtectSystem=strict` в юните нужно
-При `ProtectSystem=strict` в systemd-юните ufw нужны права на запись: `ReadWritePaths=/etc/ufw /run`.
+`ReadWritePaths=/etc/ufw /run`.
-
-## Версия
-Версия задаётся в одном месте - `VERSION.txt`; файл вшивается в сервер и агент при сборке.
 
 ## Пользователь терминала
-По умолчанию терминал открывается от пользователя, под которым запущен агент (на Linux - root).
+По умолчанию терминал открывается от пользователя агента (root). В «Изменить машину» можно выбрать
-В окне «Изменить машину» можно выбрать другого пользователя машины или создать нового
+другого пользователя или создать нового (с паролем, по желанию с sudo) - если агент запущен от root.
-(имя, пароль, опционально - добавить в sudo). Смена и создание работают, только если агент запущен от root.
+Файловый менеджер работает от пользователя агента.
-Файловый менеджер по-прежнему работает от пользователя агента.
 
 ## Безопасность
-- Пароли админов - bcrypt; сессии в HttpOnly/Secure/SameSite куках; CSRF на формах; rate-limit логина.
+- Пароли админов - bcrypt; сессии в HttpOnly/Secure/SameSite куках; CSRF на формах;
-- Агенты: общий enroll-секрет → индивидуальный токен (хранится хешем, сверка constant-time).
+  ограничение попыток входа, PIN и кода установки.
-- Открытие терминала пишется в таблицу `audit` (терминал даёт root-доступ), как и смена/создание пользователя.
+- Ключи доступа (WebAuthn) - вход без пароля; пароль можно выключить совсем.
+- Агенты: общий enroll-секрет → индивидуальный токен (хранится хешем, сверка constant-time);
+  туннель авторизуется HMAC от токена.
+- SSH-пароли и ключи передаются агенту один раз для подключения и нигде не сохраняются.
+- Открытие терминала и SSH, перенос файлов на другие машины, смена пользователя пишутся в `audit`.
 
 ## Скриншоты
 <img width="1256" height="709" alt="image" src="https://github.com/user-attachments/assets/5f0b30f1-d5e3-4b62-817e-4041641df6e3" />

VERSION.txt

@@ -1 +1 @@
-0.0.6
+0.1.2

cmd/agent/main.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"os/signal"
 	"strconv"
+	"strings"
 	"syscall"
 
 	"github.com/x-grk/longpolling-remote-access/internal/agent"
@@ -21,6 +22,7 @@ func main() {
 	host := envOr("HOST", "https://REDACTED:8445")
 	cfg := agent.Config{
 		Host:         host,
+		Fallback:     strings.TrimRight(os.Getenv("FALLBACK_HOST"), "/"),
 		EnrollSecret: os.Getenv("ENROLL_SECRET"),
 		Name:         os.Getenv("AGENT_NAME"),
 		StatePath:    envOr("STATE_PATH", "/etc/lpagent/state.json"),
@@ -38,7 +40,11 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
 	defer stop()
 
-	if err := agent.New(cfg).Run(ctx); err != nil {
+	err := agent.New(cfg).Run(ctx)
+	// Stopping (an update, a restart): hang the terminals up, so their shells
+	// save their history instead of being killed.
+	agent.CloseTerminals()
+	if err != nil {
 		log.Fatalf("agent: %v", err)
 	}
 }

deploy/nginx.conf.example

@@ -4,14 +4,21 @@
 # Put this in /etc/nginx/sites-available/lp_agent and symlink it into
 # sites-enabled, then:  sudo nginx -t && sudo systemctl reload nginx
 #
-# Everything (agent + browser terminal) is plain HTTP long-polling, so NO
+# Agents connect by WebSocket (from 0.1.0), with HTTP long polling to fall
-# WebSocket config is needed. The two settings that matter:
+# back on; the browser uses plain HTTP. The settings that matter:
+#   - Upgrade / Connection headers -> let the agents' WebSocket through
 #   - proxy_buffering off          -> deliver long-poll responses immediately
-#   - proxy_read_timeout 120s  -> longer than the 25s long-poll hold
+#   - proxy_read_timeout 300s      -> longer than the 25s long-poll hold
 #
 # NOTE: proxy_pass MUST start with "http://". A bare "proxy_pass 127.0.0.1:8091;"
 # causes nginx error:  [emerg] invalid URL prefix.
 
+# "Connection: upgrade" for a WebSocket, "close" for everything else.
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    ''      close;
+}
+
 server {
     listen 8445 ssl;
     server_name REDACTED;
@@ -21,7 +28,8 @@ server {
     include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
     ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
 
-    # Agent binaries can be large; allow the download.
+    # Files go through the panel in 4 MB pieces; 64m leaves room for a client
+    # that predates the pieces, which takes a file of up to 32 MB in one request.
     client_max_body_size 64m;
 
     location / {
@@ -32,6 +40,9 @@ server {
         proxy_set_header X-Real-IP         $remote_addr;
         proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
+        # Agents' WebSocket.
+        proxy_set_header Upgrade           $http_upgrade;
+        proxy_set_header Connection        $connection_upgrade;
 
         # Long-poll behaviour: no buffering, generous read timeout.
         proxy_buffering     off;
@@ -39,7 +50,7 @@ server {
         # Pass uploads on as they arrive: the speed test through the browser
         # times them on the client.
         proxy_request_buffering off;
-        proxy_read_timeout  120s;
+        proxy_read_timeout  300s;
-        proxy_send_timeout  120s;
+        proxy_send_timeout  300s;
     }
 }

go.mod

@@ -3,6 +3,7 @@ module github.com/x-grk/longpolling-remote-access
 go 1.26
 
 require (
+	github.com/coder/websocket v1.8.12
 	github.com/creack/pty v1.1.21
 	golang.org/x/crypto v0.31.0
 	golang.org/x/sys v0.28.0
@@ -12,9 +13,19 @@ require (
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
 	github.com/mattn/go-isatty v0.0.16 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	lukechampine.com/uint128 v1.2.0 // indirect
+	modernc.org/cc/v3 v3.40.0 // indirect
+	modernc.org/ccgo/v3 v3.16.13 // indirect
 	modernc.org/libc v1.22.5 // indirect
 	modernc.org/mathutil v1.5.0 // indirect
 	modernc.org/memory v1.5.0 // indirect
+	modernc.org/opt v0.1.3 // indirect
+	modernc.org/strutil v1.1.3 // indirect
+	modernc.org/token v1.0.1 // indirect
 )

go.sum

@@ -1,28 +1,80 @@
+github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
+github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
 github.com/creack/pty v1.1.21 h1:1/QdRyBaHHJP61QkWMXlOIBfsgdDeeKfK8SYVUWJKf0=
 github.com/creack/pty v1.1.21/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
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 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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internal/agent/client.go

@@ -18,6 +18,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	lpra "github.com/x-grk/longpolling-remote-access"
@@ -30,6 +31,7 @@ var Version = lpra.Version
 // Config is the agent's runtime configuration (from env / config.env).
 type Config struct {
 	Host         string // e.g. https://REDACTED:8445
+	Fallback     string // the direct address, from the installer (FALLBACK_HOST); may be empty
 	EnrollSecret string
 	Name         string // optional friendly name
 	StatePath    string // where the enrolled id+token are persisted
@@ -42,16 +44,23 @@ type Config struct {
 type state struct {
 	AgentID string `json:"agent_id"`
 	Token   string `json:"token"`
+	// Fallback is the direct address as the server told it.
+	Fallback string `json:"fallback,omitempty"`
 }
 
 // Agent is a running client.
 type Agent struct {
 	cfg       Config
 	http      *http.Client
+	stream    *http.Client
 	state     state
+	stateMu   sync.Mutex
+	hosts     hostState
 	pollCount int
 
 	// Direct tunnel currently running (see setTunnelAddr).
+	transport atomic.Value // string: auto, ws or lp, as the server says
+	link      atomic.Pointer[wsLink]
 	tunMu     sync.Mutex
 	tunAddr   string
 	tunCancel context.CancelFunc
@@ -81,6 +90,8 @@ func New(cfg Config) *Agent {
 		cfg: cfg,
 		// Timeout must exceed the server's long-poll hold (25s) plus slack.
 		http: &http.Client{Timeout: 60 * time.Second, Transport: tr},
+		// File streams take as long as the file needs.
+		stream: &http.Client{Transport: tr},
 	}
 }
 
@@ -91,11 +102,20 @@ func (a *Agent) Run(ctx context.Context) error {
 		return err
 	}
 	if a.state.AgentID == "" || a.state.Token == "" {
-		if err := a.enroll(ctx); err != nil {
+		err := a.enroll(ctx)
+		// The main address out of reach at install: the direct one.
+		if err != nil && a.cfg.Fallback != "" && a.cfg.Fallback != a.cfg.Host {
+			log.Printf("enroll at %s: %v - trying %s", a.cfg.Host, err, a.cfg.Fallback)
+			a.setHost(a.cfg.Fallback)
+			a.hostChanged()
+			err = a.enroll(ctx)
+		}
+		if err != nil {
 			return fmt.Errorf("enroll: %w", err)
 		}
 	}
-	log.Printf("agent %s connected to %s", a.state.AgentID, a.cfg.Host)
+	go a.watchMain(ctx)
+	log.Printf("agent %s connected to %s", a.state.AgentID, a.host())
 
 	// Direct forward tunnel (low-latency TCP mux + UDP). Its address comes
 	// from the panel; fall back to the configured one when the server sends
@@ -104,25 +124,142 @@ func (a *Agent) Run(ctx context.Context) error {
 		a.setTunnelAddr(ctx, a.cfg.TunnelAddr)
 	}
 
+	// The control channel: a WebSocket, or long polls. In "auto" a failed or
+	// dropped WebSocket gives way to long polling for a minute, then is tried
+	// again; "ws" keeps trying the WebSocket; "lp" only polls.
 	backoff := time.Second
 	for ctx.Err() == nil {
-		if err := a.pollOnce(ctx); err != nil {
+		if a.mode() == proto.TransportLP {
-			log.Printf("poll: %v (retry in %s)", err, backoff)
+			a.longPoll(ctx, 0)
+			continue
+		}
+		err := a.runWS(ctx)
+		if ctx.Err() != nil {
+			return nil
+		}
+		// Moved to the other address: the WebSocket goes there at once.
+		if a.hostChanged() {
+			backoff = time.Second
+			continue
+		}
+		a.failed()
+		if a.hostChanged() {
+			continue
+		}
+		switch a.mode() {
+		case proto.TransportWS:
+			log.Printf("websocket: %v (retry in %s)", err, backoff)
 			select {
 			case <-time.After(backoff):
 			case <-ctx.Done():
 				return nil
 			}
-			if backoff < 15*time.Second {
+			backoff = min(backoff*2, retryCap)
-				backoff *= 2
-			}
 			continue
+		case proto.TransportAuto:
+			log.Printf("websocket: %v - long polling, websocket again in a minute", err)
 		}
 		backoff = time.Second
+		a.longPoll(ctx, time.Minute)
 	}
 	return nil
 }
 
+// mode is the transport the server set for this agent.
+func (a *Agent) mode() string {
+	if v, ok := a.transport.Load().(string); ok {
+		return v
+	}
+	return proto.TransportAuto
+}
+
+func (a *Agent) applyTransport(v string) {
+	switch v {
+	case proto.TransportAuto, proto.TransportWS, proto.TransportLP:
+		if v != a.mode() {
+			log.Printf("transport: %s", v)
+			a.transport.Store(v)
+		}
+	}
+}
+
+// longPoll runs control polls: for d, or with d zero until the transport is
+// no longer long polling.
+func (a *Agent) longPoll(ctx context.Context, d time.Duration) {
+	until := time.Now().Add(d)
+	backoff := time.Second
+	// The server was out of reach (a network down, a machine asleep): once
+	// a poll gets through again, "auto" tries the WebSocket at once rather
+	// than at the end of the minute - it was the network, not the WebSocket.
+	lost := false
+	for ctx.Err() == nil {
+		if d > 0 && (time.Now().After(until) || a.mode() == proto.TransportWS) {
+			return
+		}
+		if d == 0 && a.mode() != proto.TransportLP {
+			return
+		}
+		// Back from out of reach in "auto": a quick request tells when the
+		// server answers again, and the WebSocket is tried then; a poll
+		// would sit held on the server first.
+		if lost && d > 0 {
+			if a.reachable(ctx) {
+				a.reached()
+				return
+			}
+			a.failed()
+			if a.hostChanged() {
+				return
+			}
+			select {
+			case <-time.After(backoff):
+			case <-ctx.Done():
+				return
+			}
+			backoff = min(backoff*2, retryCap)
+			continue
+		}
+		// In "auto" the minute is a minute: a poll still held then is cut
+		// short (the server keeps its job for the next one).
+		reqCtx, cancel := ctx, context.CancelFunc(func() {})
+		if d > 0 {
+			reqCtx, cancel = context.WithDeadline(ctx, until)
+		}
+		err := a.pollOnce(ctx, reqCtx)
+		cut := reqCtx.Err() == context.DeadlineExceeded
+		cancel()
+		if err != nil && cut && ctx.Err() == nil {
+			return
+		}
+		if err != nil {
+			a.failed()
+			if a.hostChanged() {
+				return
+			}
+			log.Printf("poll: %v (retry in %s)", err, backoff)
+			select {
+			case <-time.After(backoff):
+			case <-ctx.Done():
+				return
+			}
+			backoff = min(backoff*2, retryCap)
+			lost = true
+			continue
+		}
+		a.reached()
+		backoff = time.Second
+	}
+}
+
+// reachable reports whether the server answers a quick request.
+func (a *Agent) reachable(ctx context.Context) bool {
+	return a.reachableAt(ctx, a.host())
+}
+
+// retryCap bounds the wait between attempts to reach the server, so a
+// machine back from sleep or a network back up is reconnected in seconds.
+const retryCap = 5 * time.Second
+
 func (a *Agent) enroll(ctx context.Context) error {
 	host, _ := os.Hostname()
 	body, _ := json.Marshal(proto.EnrollRequest{
@@ -133,7 +270,7 @@ func (a *Agent) enroll(ctx context.Context) error {
 		Version:  Version,
 		User:     currentUser(),
 	})
-	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.cfg.Host+"/api/agent/enroll", bytes.NewReader(body))
+	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.host()+"/api/agent/enroll", bytes.NewReader(body))
 	req.Header.Set("X-Enroll-Secret", a.cfg.EnrollSecret)
 	req.Header.Set("Content-Type", "application/json")
 	resp, err := a.http.Do(req)
@@ -154,8 +291,10 @@ func (a *Agent) enroll(ctx context.Context) error {
 }
 
 // pollOnce performs one control long-poll and dispatches any instruction.
-func (a *Agent) pollOnce(ctx context.Context) error {
+// The poll itself runs on reqCtx, which may end early; what it starts runs on
-	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, a.cfg.Host+"/api/agent/poll", nil)
+// ctx.
+func (a *Agent) pollOnce(ctx, reqCtx context.Context) error {
+	req, _ := http.NewRequestWithContext(reqCtx, http.MethodGet, a.host()+"/api/agent/poll", nil)
 	a.authHeaders(req)
 	// Report the version and our OS user occasionally (not every poll), so the
 	// panel can flag outdated agents without extra traffic.
@@ -180,7 +319,15 @@ func (a *Agent) pollOnce(ctx context.Context) error {
 		return err
 	}
 	a.applyTunnelHeader(ctx, resp.Header)
-	// Dispatch in the background so we keep polling for more work.
+	a.learnAddrs(resp.Header.Get(proto.MainHeader), resp.Header.Get(proto.FallbackHeader))
+	a.applyTransport(resp.Header.Get(proto.TransportHeader))
+	a.dispatch(ctx, msg)
+	return nil
+}
+
+// dispatch starts what a control message asks for, in the background, so the
+// control channel keeps listening.
+func (a *Agent) dispatch(ctx context.Context, msg proto.ControlMessage) {
 	switch msg.Type {
 	case proto.CtrlOpenTerminal:
 		go a.runTerminal(ctx, msg.SessionID, msg.User)
@@ -188,8 +335,11 @@ func (a *Agent) pollOnce(ctx context.Context) error {
 		go a.runForward(ctx, msg.SessionID, msg.Port)
 	case proto.CtrlTask:
 		go a.runTask(ctx, msg.TaskID)
+	case proto.CtrlOpenSSH:
+		if msg.SSH != nil {
+			go a.runSSH(ctx, msg.SessionID, *msg.SSH)
+		}
 	}
-	return nil
 }
 
 // fetchConfig asks the server for the settings it hands to agents and reports
@@ -197,20 +347,25 @@ func (a *Agent) pollOnce(ctx context.Context) error {
 func (a *Agent) fetchConfig(ctx context.Context) bool {
 	ctx2, cancel := context.WithTimeout(ctx, 10*time.Second)
 	defer cancel()
-	req, _ := http.NewRequestWithContext(ctx2, http.MethodGet, a.cfg.Host+"/api/agent/config", nil)
+	req, _ := http.NewRequestWithContext(ctx2, http.MethodGet, a.host()+"/api/agent/config", nil)
 	a.authHeaders(req)
 	resp, err := a.http.Do(req)
 	if err != nil {
 		return false
 	}
 	defer resp.Body.Close()
+	a.applyTransport(resp.Header.Get(proto.TransportHeader))
+	a.learnAddrs(resp.Header.Get(proto.MainHeader), resp.Header.Get(proto.FallbackHeader))
 	return a.applyTunnelHeader(ctx, resp.Header)
 }
 
 // applyTunnelHeader follows the tunnel address the server advertises as
 // "host:port"; an empty host means the host we already reach the server on.
 func (a *Agent) applyTunnelHeader(ctx context.Context, h http.Header) bool {
-	v := h.Get("X-Tunnel-Addr")
+	return a.applyTunnelAddr(ctx, h.Get("X-Tunnel-Addr"))
+}
+
+func (a *Agent) applyTunnelAddr(ctx context.Context, v string) bool {
 	if v == "" || a.cfg.TunnelPinned {
 		return false
 	}
@@ -219,7 +374,7 @@ func (a *Agent) applyTunnelHeader(ctx context.Context, h http.Header) bool {
 		return false
 	}
 	if host == "" {
-		u, err := url.Parse(a.cfg.Host)
+		u, err := url.Parse(a.host())
 		if err != nil || u.Hostname() == "" {
 			return false
 		}
@@ -274,7 +429,9 @@ func (a *Agent) saveState() error {
 	if err := os.MkdirAll(filepath.Dir(a.cfg.StatePath), 0o700); err != nil {
 		return err
 	}
+	a.stateMu.Lock()
 	b, _ := json.MarshalIndent(a.state, "", "  ")
+	a.stateMu.Unlock()
 	return os.WriteFile(a.cfg.StatePath, b, 0o600)
 }
 

internal/agent/fs.go

@@ -72,6 +72,18 @@ func dispatchFS(env proto.TaskEnvelope) (any, error) {
 		var a proto.FSZipArgs
 		_ = json.Unmarshal(env.Args, &a)
 		return fsZip(a.Paths, a.Dest)
+	case proto.TaskFSStat:
+		var a proto.FSPathArgs
+		_ = json.Unmarshal(env.Args, &a)
+		return fsStat(a.Path)
+	case proto.TaskFSChmod:
+		var a proto.FSChmodArgs
+		_ = json.Unmarshal(env.Args, &a)
+		return fsChmod(a)
+	case proto.TaskFSCopy:
+		var a proto.FSCopyArgs
+		_ = json.Unmarshal(env.Args, &a)
+		return fsCopy(a)
 	default:
 		return nil, fmt.Errorf("неизвестная операция %q", env.Type)
 	}

internal/agent/fscopy.go

@@ -0,0 +1,166 @@
+package agent
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// fsCopy copies or moves Src to Dst, following Conflict when Dst exists.
+func fsCopy(a proto.FSCopyArgs) (any, error) {
+	src, dst := filepath.Clean(a.Src), filepath.Clean(a.Dst)
+	if a.Src == "" || a.Dst == "" {
+		return nil, errors.New("не указан путь")
+	}
+	if src == dst {
+		return nil, errors.New("откуда и куда - одно и то же")
+	}
+	if strings.HasPrefix(dst, src+string(filepath.Separator)) {
+		return nil, errors.New("нельзя положить папку внутрь неё самой")
+	}
+	if _, err := os.Lstat(src); err != nil {
+		return nil, err
+	}
+	if _, err := os.Stat(filepath.Dir(dst)); err != nil {
+		return nil, fmt.Errorf("нет папки %s", filepath.Dir(dst))
+	}
+	c := &copier{move: a.Move, conflict: a.Conflict}
+	if err := c.place(src, dst); err != nil {
+		return map[string]int{"done": c.done, "skipped": c.skipped}, err
+	}
+	return map[string]int{"done": c.done, "skipped": c.skipped}, nil
+}
+
+type copier struct {
+	move          bool
+	conflict      string
+	done, skipped int
+}
+
+// place puts src at dst. Two folders merge when the rule allows it; anything
+// else that is in the way stops, is replaced or is kept, by the rule.
+func (c *copier) place(src, dst string) error {
+	si, err := os.Lstat(src)
+	if err != nil {
+		return err
+	}
+	di, err := os.Lstat(dst)
+	if err == nil {
+		if c.conflict != "replace" && c.conflict != "skip" {
+			return fmt.Errorf("%s уже существует", dst)
+		}
+		if si.IsDir() && di.IsDir() {
+			entries, err := os.ReadDir(src)
+			if err != nil {
+				return err
+			}
+			for _, e := range entries {
+				if err := c.place(filepath.Join(src, e.Name()), filepath.Join(dst, e.Name())); err != nil {
+					return err
+				}
+			}
+			if c.move {
+				// Whatever was skipped stays where it was.
+				_ = os.Remove(src)
+			}
+			return nil
+		}
+		if c.conflict == "skip" {
+			c.skipped++
+			return nil
+		}
+		if err := os.RemoveAll(dst); err != nil {
+			return err
+		}
+	} else if !errors.Is(err, fs.ErrNotExist) {
+		return err
+	}
+	if c.move {
+		err := os.Rename(src, dst)
+		if err == nil {
+			c.done++
+			return nil
+		}
+		// Another file system: copy, then take the original away.
+		if !errors.Is(err, syscall.EXDEV) {
+			return err
+		}
+		if err := c.copyTree(src, dst); err != nil {
+			return err
+		}
+		return os.RemoveAll(src)
+	}
+	return c.copyTree(src, dst)
+}
+
+// copyTree copies a file, a symlink or a whole folder, keeping modes and
+// times.
+func (c *copier) copyTree(src, dst string) error {
+	return filepath.WalkDir(src, func(p string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		rel, _ := filepath.Rel(src, p)
+		to := filepath.Join(dst, rel)
+		info, err := os.Lstat(p)
+		if err != nil {
+			return err
+		}
+		switch {
+		case info.Mode()&fs.ModeSymlink != 0:
+			link, err := os.Readlink(p)
+			if err != nil {
+				return err
+			}
+			if err := os.Symlink(link, to); err != nil {
+				return err
+			}
+		case info.IsDir():
+			if err := os.Mkdir(to, info.Mode().Perm()); err != nil && !errors.Is(err, fs.ErrExist) {
+				return err
+			}
+		case info.Mode().IsRegular():
+			if err := copyFile(p, to, info); err != nil {
+				return err
+			}
+		default:
+			return nil // sockets, devices: not copied
+		}
+		c.done++
+		if st, ok := info.Sys().(*syscall.Stat_t); ok {
+			_ = os.Lchown(to, int(st.Uid), int(st.Gid))
+		}
+		if info.Mode()&fs.ModeSymlink == 0 {
+			_ = os.Chtimes(to, info.ModTime(), info.ModTime())
+		}
+		return nil
+	})
+}
+
+func copyFile(src, dst string, info fs.FileInfo) error {
+	in, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer in.Close()
+	out, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, info.Mode().Perm())
+	if err != nil {
+		return err
+	}
+	if _, err := io.Copy(out, in); err != nil {
+		out.Close()
+		os.Remove(dst)
+		return err
+	}
+	if err := out.Close(); err != nil {
+		return err
+	}
+	return os.Chmod(dst, info.Mode()&(fs.ModePerm|fs.ModeSetuid|fs.ModeSetgid|fs.ModeSticky))
+}

internal/agent/fsprops.go

@@ -0,0 +1,163 @@
+package agent
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"os/user"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"syscall"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// fsStat reports a file's properties, following a symlink to what it points
+// at, and the user and group names to choose an owner from.
+func fsStat(path string) (proto.FSStatResult, error) {
+	res := proto.FSStatResult{Path: path}
+	if li, err := os.Lstat(path); err == nil && li.Mode()&os.ModeSymlink != 0 {
+		res.Link, _ = os.Readlink(path)
+	}
+	info, err := os.Stat(path)
+	if err != nil {
+		return res, err
+	}
+	res.IsDir, res.Size, res.MTime = info.IsDir(), info.Size(), info.ModTime().Unix()
+	if st, ok := info.Sys().(*syscall.Stat_t); ok {
+		res.Mode = uint32(st.Mode) & 07777
+		res.UID, res.GID = int(st.Uid), int(st.Gid)
+	} else {
+		res.Mode = uint32(info.Mode().Perm())
+	}
+	res.Owner, res.Group = strconv.Itoa(res.UID), strconv.Itoa(res.GID)
+	if u, err := user.LookupId(res.Owner); err == nil {
+		res.Owner = u.Username
+	}
+	if g, err := user.LookupGroupId(res.Group); err == nil {
+		res.Group = g.Name
+	}
+	res.Users, res.Groups = namesIn("/etc/passwd"), namesIn("/etc/group")
+	return res, nil
+}
+
+// namesIn lists the first field of a passwd- or group-style file.
+func namesIn(file string) []string {
+	f, err := os.Open(file)
+	if err != nil {
+		return nil
+	}
+	defer f.Close()
+	var out []string
+	sc := bufio.NewScanner(f)
+	for sc.Scan() && len(out) < 1000 {
+		line := sc.Text()
+		if line == "" || line[0] == '#' {
+			continue
+		}
+		if name, _, ok := strings.Cut(line, ":"); ok && name != "" {
+			out = append(out, name)
+		}
+	}
+	sort.Strings(out)
+	return out
+}
+
+// lookupID resolves a user or group given by name or number; -1 for none.
+func lookupID(name string, group bool) (int, error) {
+	if name == "" {
+		return -1, nil
+	}
+	if n, err := strconv.Atoi(name); err == nil && n >= 0 {
+		return n, nil
+	}
+	if group {
+		g, err := user.LookupGroup(name)
+		if err != nil {
+			return -1, fmt.Errorf("группа %s не найдена", name)
+		}
+		return strconv.Atoi(g.Gid)
+	}
+	u, err := user.Lookup(name)
+	if err != nil {
+		return -1, fmt.Errorf("пользователь %s не найден", name)
+	}
+	return strconv.Atoi(u.Uid)
+}
+
+// fsChmod sets mode, owner and group on a path, and with Recursive on all
+// that is inside a folder. Symlinks inside are not followed.
+func fsChmod(a proto.FSChmodArgs) (any, error) {
+	if a.Path == "" {
+		return nil, errors.New("не указан путь")
+	}
+	if a.Recursive && filepath.Clean(a.Path) == "/" {
+		return nil, errors.New("отказ: рекурсивно для корня нельзя")
+	}
+	if a.Mode != nil && *a.Mode > 07777 {
+		return nil, errors.New("неверные права")
+	}
+	uid, err := lookupID(a.Owner, false)
+	if err != nil {
+		return nil, err
+	}
+	gid, err := lookupID(a.Group, true)
+	if err != nil {
+		return nil, err
+	}
+	changed, failed := 0, 0
+	var errs []string
+	// The path itself always gets the change; Only picks among what is in it.
+	apply := func(p string, isDir, isLink, self bool) {
+		if !self && ((a.Only == "files" && isDir) || (a.Only == "dirs" && !isDir)) {
+			return
+		}
+		var err error
+		if uid >= 0 || gid >= 0 {
+			err = os.Lchown(p, uid, gid)
+		}
+		// A symlink has no mode of its own: chmod would change its target.
+		if err == nil && a.Mode != nil && !isLink {
+			err = syscall.Chmod(p, *a.Mode)
+		}
+		if err != nil {
+			failed++
+			if len(errs) < 5 {
+				errs = append(errs, err.Error())
+			}
+			return
+		}
+		changed++
+	}
+	info, err := os.Stat(a.Path)
+	if err != nil {
+		return nil, err
+	}
+	if !a.Recursive || !info.IsDir() {
+		apply(a.Path, info.IsDir(), false, true)
+	} else {
+		err = filepath.WalkDir(a.Path, func(p string, d fs.DirEntry, err error) error {
+			if err != nil {
+				failed++
+				if len(errs) < 5 {
+					errs = append(errs, err.Error())
+				}
+				return nil
+			}
+			apply(p, d.IsDir(), d.Type()&fs.ModeSymlink != 0, p == a.Path)
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+	}
+	res := map[string]any{"changed": changed, "failed": failed, "errors": errs}
+	if failed > 0 && changed == 0 {
+		return res, errors.New(errs[0])
+	}
+	return res, nil
+}

internal/agent/fsstream.go

@@ -0,0 +1,291 @@
+package agent
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// Files go to and from the browser in pieces, each a request of its own
+// through the server: small enough for any proxy in front, and sent again
+// alone when the link drops it. A few go at once, so a good link is kept as
+// busy as by one long stream.
+
+const (
+	// xferWorkers is how many pieces are in flight at once.
+	xferWorkers = 4
+	// xferPieceTimeout bounds one piece's request: a link that slow, or
+	// stuck, gets the piece sent again.
+	xferPieceTimeout = 5 * time.Minute
+	// xferTries bounds how often a piece is tried over a failing link.
+	xferTries = 30
+)
+
+// errXferGone is the server saying the transfer is over: the browser left
+// or gave up.
+type errXferGone string
+
+func (e errXferGone) Error() string { return string(e) }
+
+func (a *Agent) xferURL(id string, i int) string {
+	return a.host() + "/api/agent/fs/xfer/" + id + "/" + strconv.Itoa(i)
+}
+
+// xferRequest makes one request for a piece, trying again over a failing link.
+// A 503 is the server waiting on the other side: asked again at once.
+func (a *Agent) xferRequest(ctx context.Context, newReq func(context.Context) (*http.Request, error), keep func(*http.Response) error) error {
+	fails := 0
+	for {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		rctx, cancel := context.WithTimeout(ctx, xferPieceTimeout)
+		req, err := newReq(rctx)
+		if err != nil {
+			cancel()
+			return err
+		}
+		a.authHeaders(req)
+		resp, err := a.stream.Do(req)
+		if err == nil {
+			switch {
+			case resp.StatusCode == http.StatusGone:
+				msg, _ := io.ReadAll(io.LimitReader(resp.Body, 512))
+				resp.Body.Close()
+				cancel()
+				return errXferGone(strings.TrimSpace(string(msg)))
+			case resp.StatusCode == http.StatusServiceUnavailable:
+				io.Copy(io.Discard, resp.Body)
+				resp.Body.Close()
+				cancel()
+				continue
+			case resp.StatusCode < 300:
+				err = keep(resp)
+				resp.Body.Close()
+				cancel()
+				if err == nil {
+					return nil
+				}
+			default:
+				io.Copy(io.Discard, resp.Body)
+				resp.Body.Close()
+				err = errStatus(resp.StatusCode)
+			}
+		}
+		cancel()
+		if fails++; fails >= xferTries {
+			return fmt.Errorf("сеть не держит передачу: %w", err)
+		}
+		select {
+		case <-time.After(min(time.Duration(fails)*time.Second, 10*time.Second)):
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}
+
+// pieces runs fn for every piece, xferWorkers at a time, until one fails.
+func pieces(ctx context.Context, n int, fn func(ctx context.Context, i int) error) error {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	var (
+		mu    sync.Mutex
+		next  int
+		first error
+		wg    sync.WaitGroup
+	)
+	for w := 0; w < min(xferWorkers, n); w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for {
+				mu.Lock()
+				if first != nil || next >= n {
+					mu.Unlock()
+					return
+				}
+				i := next
+				next++
+				mu.Unlock()
+				if err := fn(ctx, i); err != nil {
+					mu.Lock()
+					if first == nil {
+						first = err
+						cancel()
+					}
+					mu.Unlock()
+					return
+				}
+			}
+		}()
+	}
+	wg.Wait()
+	return first
+}
+
+func pieceCount(size int64, chunk int) int {
+	if size <= 0 {
+		return 1
+	}
+	return int((size + int64(chunk) - 1) / int64(chunk))
+}
+
+// doFSPut writes the file the browser is uploading. It lands in a temporary
+// file next to the target first, so a broken upload leaves the old file as it
+// was.
+func (a *Agent) doFSPut(ctx context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSXferArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if args.Size < 0 || args.Size > proto.FSFileCap || args.Chunk <= 0 {
+		return proto.TaskResult{Error: "файл больше 512 МБ"}
+	}
+	dir, base := filepath.Split(args.Path)
+	if dir == "" {
+		dir = "."
+	}
+	if info, err := os.Stat(args.Path); err == nil && info.IsDir() {
+		return proto.TaskResult{Error: "это каталог"}
+	}
+	tmp, err := os.CreateTemp(dir, "."+base+".lpra-*")
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	done := false
+	defer func() {
+		if !done {
+			tmp.Close()
+			os.Remove(tmp.Name())
+		}
+	}()
+
+	// Pieces written so far, to tell the server which it can let go.
+	n := pieceCount(args.Size, args.Chunk)
+	var (
+		mu     sync.Mutex
+		got    = make([]bool, n)
+		contig int
+	)
+	err = pieces(ctx, n, func(ctx context.Context, i int) error {
+		want := min(int64(args.Chunk), args.Size-int64(i)*int64(args.Chunk))
+		mu.Lock()
+		ack := contig
+		mu.Unlock()
+		var data []byte
+		err := a.xferRequest(ctx, func(ctx context.Context) (*http.Request, error) {
+			return http.NewRequestWithContext(ctx, http.MethodGet, a.xferURL(args.Xfer, i)+"?ack="+strconv.Itoa(ack), nil)
+		}, func(resp *http.Response) error {
+			b, err := io.ReadAll(io.LimitReader(resp.Body, int64(args.Chunk)+1))
+			if err == nil && int64(len(b)) != want {
+				err = errors.New("кусок не той длины")
+			}
+			data = b
+			return err
+		})
+		if err != nil {
+			return err
+		}
+		if _, err := tmp.WriteAt(data, int64(i)*int64(args.Chunk)); err != nil {
+			return err
+		}
+		mu.Lock()
+		got[i] = true
+		for contig < n && got[contig] {
+			contig++
+		}
+		mu.Unlock()
+		return nil
+	})
+	if err != nil {
+		var gone errXferGone
+		if errors.As(err, &gone) {
+			return proto.TaskResult{Error: "загрузка прервана: " + string(gone)}
+		}
+		return proto.TaskResult{Error: "загрузка прервана: " + err.Error()}
+	}
+	if err := tmp.Truncate(args.Size); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if err := tmp.Close(); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	// A file that is being replaced keeps its mode and owner.
+	mode := os.FileMode(0o644)
+	if info, err := os.Stat(args.Path); err == nil {
+		mode = info.Mode().Perm()
+		if st, ok := info.Sys().(*syscall.Stat_t); ok {
+			_ = os.Chown(tmp.Name(), int(st.Uid), int(st.Gid))
+		}
+	}
+	if err := os.Chmod(tmp.Name(), mode); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if err := os.Rename(tmp.Name(), args.Path); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	done = true
+	data, _ := json.Marshal(map[string]any{"path": args.Path, "size": args.Size})
+	return proto.TaskResult{OK: true, Data: data}
+}
+
+// doFSSend sends a file to the browser that asked for it.
+func (a *Agent) doFSSend(ctx context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSXferArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if args.Chunk <= 0 {
+		return proto.TaskResult{Error: "не задан размер куска"}
+	}
+	f, err := os.Open(args.Path)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	defer f.Close()
+	info, err := f.Stat()
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if info.IsDir() {
+		return proto.TaskResult{Error: "это каталог"}
+	}
+	size := info.Size()
+	if size > proto.FSFileCap {
+		return proto.TaskResult{Error: "файл больше 512 МБ"}
+	}
+	sizeHdr := strconv.FormatInt(size, 10)
+	err = pieces(ctx, pieceCount(size, args.Chunk), func(ctx context.Context, i int) error {
+		off := int64(i) * int64(args.Chunk)
+		buf := make([]byte, min(int64(args.Chunk), size-off))
+		if _, err := f.ReadAt(buf, off); err != nil && err != io.EOF {
+			return err
+		}
+		return a.xferRequest(ctx, func(ctx context.Context) (*http.Request, error) {
+			req, err := http.NewRequestWithContext(ctx, http.MethodPost, a.xferURL(args.Xfer, i), bytes.NewReader(buf))
+			if err == nil {
+				req.Header.Set("X-Size", sizeHdr)
+				req.Header.Set("Content-Type", "application/octet-stream")
+			}
+			return req, err
+		}, func(*http.Response) error { return nil })
+	})
+	if err != nil {
+		return proto.TaskResult{Error: "передача прервана: " + err.Error()}
+	}
+	data, _ := json.Marshal(map[string]any{"path": args.Path, "size": size})
+	return proto.TaskResult{OK: true, Data: data}
+}

internal/agent/hosts.go

@@ -0,0 +1,176 @@
+package agent
+
+import (
+	"context"
+	"log"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// The server can be reached at two addresses: the main one (behind
+// Cloudflare, say) and a direct one that goes to the server itself. The
+// direct one comes from the installer or, for agents installed before it was
+// set, from the server, and is kept in the state file. When the address in
+// use has been out of reach for a while the agent tries the other; on the
+// direct one it keeps checking the main one and goes back when it answers.
+
+const (
+	// switchAfter is how long the address in use may fail before the other
+	// is tried.
+	switchAfter = 30 * time.Second
+	// mainCheck is how often the main address is checked from the direct one.
+	mainCheck = 5 * time.Minute
+)
+
+type hostState struct {
+	mu        sync.Mutex
+	cur       string
+	downSince time.Time
+	changed   bool // the address changed: the WebSocket goes there at once
+}
+
+// host is the server address in use now.
+func (a *Agent) host() string {
+	a.hosts.mu.Lock()
+	defer a.hosts.mu.Unlock()
+	if a.hosts.cur == "" {
+		return a.cfg.Host
+	}
+	return a.hosts.cur
+}
+
+// fallback is the direct address: the installer's, else the one the server
+// told.
+func (a *Agent) fallback() string {
+	if a.cfg.Fallback != "" {
+		return a.cfg.Fallback
+	}
+	a.stateMu.Lock()
+	defer a.stateMu.Unlock()
+	return a.state.Fallback
+}
+
+// learnAddrs keeps the server's other address from the two it tells: the
+// direct one, or the main one when the agent was set to the direct one.
+func (a *Agent) learnAddrs(main, direct string) {
+	main = strings.TrimRight(strings.TrimSpace(main), "/")
+	direct = strings.TrimRight(strings.TrimSpace(direct), "/")
+	v := direct
+	if direct != "" && strings.EqualFold(direct, a.cfg.Host) {
+		v = main
+	}
+	if v == "" || strings.EqualFold(v, a.cfg.Host) || a.cfg.Fallback != "" {
+		return
+	}
+	a.stateMu.Lock()
+	same := a.state.Fallback == v
+	if !same {
+		a.state.Fallback = v
+	}
+	a.stateMu.Unlock()
+	if !same {
+		log.Printf("fallback address: %s", v)
+		_ = a.saveState()
+	}
+}
+
+// setHost moves to addr: requests go there from now on, and the WebSocket
+// is dropped to reconnect there.
+func (a *Agent) setHost(addr string) {
+	a.hosts.mu.Lock()
+	if a.hosts.cur == addr || (a.hosts.cur == "" && addr == a.cfg.Host) {
+		a.hosts.mu.Unlock()
+		return
+	}
+	a.hosts.cur, a.hosts.downSince, a.hosts.changed = addr, time.Time{}, true
+	a.hosts.mu.Unlock()
+	log.Printf("server address: %s", addr)
+	if l := a.link.Load(); l != nil {
+		l.close()
+	}
+}
+
+// hostChanged reports, once, that the address changed.
+func (a *Agent) hostChanged() bool {
+	a.hosts.mu.Lock()
+	defer a.hosts.mu.Unlock()
+	c := a.hosts.changed
+	a.hosts.changed = false
+	return c
+}
+
+// reached notes the server answered; failed notes it did not, and after
+// switchAfter of that moves to the other address.
+func (a *Agent) reached() {
+	a.hosts.mu.Lock()
+	a.hosts.downSince = time.Time{}
+	a.hosts.mu.Unlock()
+}
+
+func (a *Agent) failed() {
+	fb := a.fallback()
+	if fb == "" || fb == a.cfg.Host {
+		return
+	}
+	a.hosts.mu.Lock()
+	now := time.Now()
+	if a.hosts.downSince.IsZero() {
+		a.hosts.downSince = now
+		a.hosts.mu.Unlock()
+		return
+	}
+	long := now.Sub(a.hosts.downSince) >= switchAfter
+	cur := a.hosts.cur
+	a.hosts.mu.Unlock()
+	if !long {
+		return
+	}
+	next := fb
+	if cur == fb {
+		next = a.cfg.Host
+	}
+	log.Printf("server out of reach for %s, trying %s", switchAfter, next)
+	a.setHost(next)
+}
+
+// watchMain moves back to the main address once it answers again.
+func (a *Agent) watchMain(ctx context.Context) {
+	t := time.NewTicker(mainCheck)
+	defer t.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+		}
+		if a.host() == a.cfg.Host {
+			continue
+		}
+		if a.reachableAt(ctx, a.cfg.Host) {
+			log.Printf("main address answers again")
+			a.setHost(a.cfg.Host)
+		}
+	}
+}
+
+// reachableAt reports whether the server answers a quick request at base.
+func (a *Agent) reachableAt(ctx context.Context, base string) bool {
+	ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, base+"/api/agent/config", nil)
+	a.authHeaders(req)
+	resp, err := a.http.Do(req)
+	if err != nil {
+		return false
+	}
+	resp.Body.Close()
+	if resp.StatusCode < 300 {
+		a.learnAddrs(resp.Header.Get(proto.MainHeader), resp.Header.Get(proto.FallbackHeader))
+		return true
+	}
+	return false
+}

internal/agent/session.go

@@ -54,6 +54,15 @@ func (a *Agent) bridgeStream(parent context.Context, sid string, rw io.ReadWrite
 	ctx, cancel := context.WithCancel(parent)
 	defer cancel()
 	defer rw.Close()
+	defer func() {
+		if l := a.link.Load(); l != nil {
+			l.unsubscribe(sid)
+		}
+	}()
+	// A session closed from the panel (a tab reloaded, a window shut) ends
+	// the stream at once, not on its next output: an idle shell would live
+	// on until the agent stopped.
+	go func() { <-ctx.Done(); rw.Close() }()
 
 	// Downstream: pull input frames and write them to the stream.
 	go func() {
@@ -84,7 +93,22 @@ func (a *Agent) bridgeStream(parent context.Context, sid string, rw io.ReadWrite
 // pollIn performs one downstream long-poll and applies the frames.
 // Returns false when the session is gone and the loop should stop.
 func (a *Agent) pollIn(ctx context.Context, sid string, w io.Writer, onResize func(cols, rows uint16)) bool {
-	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, a.cfg.Host+"/api/agent/term/"+sid+"/in", nil)
+	// On the WebSocket the input comes pushed; if it drops, by a long poll.
+	if l := a.link.Load(); l != nil {
+		if ch := l.subscribe(sid); ch != nil {
+			select {
+			case in := <-ch:
+				if in.gone {
+					return false
+				}
+				return applyFrames(in.frames, w, onResize)
+			case <-l.done:
+			case <-ctx.Done():
+				return false
+			}
+		}
+	}
+	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, a.host()+"/api/agent/term/"+sid+"/in", nil)
 	a.authHeaders(req)
 	resp, err := a.http.Do(req)
 	if err != nil {
@@ -101,7 +125,13 @@ func (a *Agent) pollIn(ctx context.Context, sid string, w io.Writer, onResize fu
 	if err := json.NewDecoder(resp.Body).Decode(&batch); err != nil {
 		return true
 	}
-	for _, f := range batch.Frames {
+	return applyFrames(batch.Frames, w, onResize)
+}
+
+// applyFrames writes a session's input to its stream; false once the panel
+// closed it.
+func applyFrames(frames []proto.InFrame, w io.Writer, onResize func(cols, rows uint16)) bool {
+	for _, f := range frames {
 		switch f.Type {
 		case proto.FrameStdin:
 			if data, err := b64.DecodeString(f.Data); err == nil {
@@ -120,8 +150,13 @@ func (a *Agent) pollIn(ctx context.Context, sid string, w io.Writer, onResize fu
 
 // postOut sends one upstream message. Returns false if the session is gone.
 func (a *Agent) postOut(ctx context.Context, sid string, msg proto.OutMessage) bool {
+	if l := a.link.Load(); l != nil {
+		if l.send(proto.WSMsg{T: "out", SID: sid, Out: &msg}) == nil {
+			return true
+		}
+	}
 	body, _ := json.Marshal(msg)
-	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.cfg.Host+"/api/agent/term/"+sid+"/out", bytes.NewReader(body))
+	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.host()+"/api/agent/term/"+sid+"/out", bytes.NewReader(body))
 	a.authHeaders(req)
 	req.Header.Set("Content-Type", "application/json")
 	resp, err := a.http.Do(req)

internal/agent/ship.go

@@ -0,0 +1,580 @@
+package agent
+
+import (
+	"archive/tar"
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// A file or folder goes to another machine as a tar stream: packed here on
+// the fly, then either posted in pieces to a relay on the server for the
+// other agent to unpack, or written by SSH straight into tar on that host.
+// Nothing is staged on disk on either side.
+
+// shipMeter counts what has gone out, for the panel's progress bar.
+type shipMeter struct {
+	total, done atomic.Int64
+	files       atomic.Int64
+	note        atomic.Value // string
+}
+
+func (m *shipMeter) snapshot() proto.ShipProgress {
+	n, _ := m.note.Load().(string)
+	return proto.ShipProgress{Total: m.total.Load(), Done: m.done.Load(), Files: int(m.files.Load()), Note: n}
+}
+
+// reportShip posts the progress to the job until ctx ends; the server
+// answering 410 means the job was cancelled, and cancel is called.
+func (a *Agent) reportShip(ctx context.Context, job string, m *shipMeter, cancel func()) {
+	if job == "" {
+		return
+	}
+	t := time.NewTicker(700 * time.Millisecond)
+	defer t.Stop()
+	for {
+		body, _ := json.Marshal(m.snapshot())
+		req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.host()+"/api/agent/fs/job/"+job+"/progress", bytes.NewReader(body))
+		a.authHeaders(req)
+		req.Header.Set("Content-Type", "application/json")
+		if resp, err := a.http.Do(req); err == nil {
+			io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			if resp.StatusCode == http.StatusGone {
+				cancel()
+				return
+			}
+		}
+		select {
+		case <-ctx.Done():
+			return
+		case <-t.C:
+		}
+	}
+}
+
+// shipName checks the name the thing gets at the other end.
+func shipName(name string) error {
+	if name == "" || name == "." || name == ".." || strings.ContainsAny(name, "/\x00") {
+		return errors.New("недопустимое имя")
+	}
+	return nil
+}
+
+// treeSize is how many bytes of files are under p.
+func treeSize(ctx context.Context, p string) int64 {
+	var n int64
+	_ = filepath.WalkDir(p, func(_ string, d fs.DirEntry, err error) error {
+		if err != nil || ctx.Err() != nil {
+			return nil
+		}
+		if d.Type().IsRegular() {
+			if info, err := d.Info(); err == nil {
+				n += info.Size()
+			}
+		}
+		return nil
+	})
+	return n
+}
+
+// packTar writes src as a tar stream whose entries start at name. Owners are
+// left out: the numbers mean other people on another machine.
+func packTar(ctx context.Context, w io.Writer, src, name string, m *shipMeter) error {
+	tw := tar.NewWriter(w)
+	err := filepath.WalkDir(src, func(p string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		info, err := os.Lstat(p)
+		if err != nil {
+			return err
+		}
+		link := ""
+		switch {
+		case info.Mode()&fs.ModeSymlink != 0:
+			if link, err = os.Readlink(p); err != nil {
+				return err
+			}
+		case info.IsDir(), info.Mode().IsRegular():
+		default:
+			return nil // sockets, devices, pipes: not sent
+		}
+		hdr, err := tar.FileInfoHeader(info, link)
+		if err != nil {
+			return err
+		}
+		rel, _ := filepath.Rel(src, p)
+		hdr.Name = name
+		if rel != "." {
+			hdr.Name = path.Join(name, filepath.ToSlash(rel))
+		}
+		if info.IsDir() {
+			hdr.Name += "/"
+		}
+		hdr.Uid, hdr.Gid, hdr.Uname, hdr.Gname = 0, 0, "", ""
+		hdr.Format = tar.FormatPAX
+		if err := tw.WriteHeader(hdr); err != nil {
+			return err
+		}
+		if info.Mode().IsRegular() {
+			f, err := os.Open(p)
+			if err != nil {
+				return err
+			}
+			_, err = io.CopyN(tw, &countReader{r: f, n: &m.done}, hdr.Size)
+			f.Close()
+			if err != nil {
+				return fmt.Errorf("%s: %v", p, err)
+			}
+		}
+		m.files.Add(1)
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+	return tw.Close()
+}
+
+type countReader struct {
+	r io.Reader
+	n *atomic.Int64
+}
+
+func (c *countReader) Read(p []byte) (int, error) {
+	n, err := c.r.Read(p)
+	c.n.Add(int64(n))
+	return n, err
+}
+
+// doShipOut sends Src to the other machine: by the relay, or by SSH.
+func (a *Agent) doShipOut(parent context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSShipArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if err := shipName(args.Name); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	src := filepath.Clean(args.Src)
+	if _, err := os.Lstat(src); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	ctx, cancel := context.WithCancel(parent)
+	defer cancel()
+	m := &shipMeter{}
+	m.note.Store("подсчёт")
+	go a.reportShip(ctx, args.Job, m, cancel)
+	m.total.Store(treeSize(ctx, src))
+
+	var err error
+	if args.SSH != nil {
+		err = a.shipSSH(ctx, args, src, m)
+	} else {
+		m.note.Store("")
+		err = a.shipRelay(ctx, args, src, m)
+	}
+	if err != nil {
+		if ctx.Err() != nil && parent.Err() == nil {
+			err = errors.New("отменено")
+		}
+		return proto.TaskResult{Error: err.Error()}
+	}
+	res := map[string]any{"files": m.files.Load(), "bytes": m.done.Load()}
+	if args.Move && args.SSH != nil {
+		if err := os.RemoveAll(src); err != nil {
+			return proto.TaskResult{Error: "отправлено, но здесь не удалилось: " + err.Error()}
+		}
+	}
+	data, _ := json.Marshal(res)
+	return proto.TaskResult{OK: true, Data: data}
+}
+
+func (a *Agent) relayURL(id string, i int) string {
+	return a.host() + "/api/agent/fs/relay/" + id + "/" + strconv.Itoa(i)
+}
+
+// shipRelay posts the tar stream in pieces, a few at once; the last carries
+// X-Last.
+func (a *Agent) shipRelay(ctx context.Context, args proto.FSShipArgs, src string, m *shipMeter) error {
+	if args.Relay == "" || args.Chunk <= 0 {
+		return errors.New("не задана передача")
+	}
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	pr, pw := io.Pipe()
+	go func() { pw.CloseWithError(packTar(ctx, pw, src, args.Name, m)) }()
+	defer pr.Close()
+
+	type piece struct {
+		i    int
+		data []byte
+		last bool
+	}
+	ch := make(chan piece, 1)
+	var (
+		mu    sync.Mutex
+		first error
+		wg    sync.WaitGroup
+	)
+	setErr := func(err error) {
+		mu.Lock()
+		if first == nil {
+			first = err
+			cancel()
+		}
+		mu.Unlock()
+	}
+	for w := 0; w < xferWorkers; w++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for p := range ch {
+				err := a.xferRequest(ctx, func(ctx context.Context) (*http.Request, error) {
+					req, err := http.NewRequestWithContext(ctx, http.MethodPost, a.relayURL(args.Relay, p.i), bytes.NewReader(p.data))
+					if err == nil {
+						req.Header.Set("Content-Type", "application/octet-stream")
+						if p.last {
+							req.Header.Set("X-Last", "1")
+						}
+					}
+					return req, err
+				}, func(*http.Response) error { return nil })
+				if err != nil {
+					setErr(err)
+				}
+			}
+		}()
+	}
+	for i := 0; ; i++ {
+		buf := make([]byte, args.Chunk)
+		n, err := io.ReadFull(pr, buf)
+		last := err == io.EOF || err == io.ErrUnexpectedEOF
+		if err != nil && !last {
+			setErr(err)
+			break
+		}
+		select {
+		case ch <- piece{i, buf[:n], last}:
+		case <-ctx.Done():
+		}
+		if last || ctx.Err() != nil {
+			break
+		}
+	}
+	close(ch)
+	wg.Wait()
+	if first != nil {
+		var gone errXferGone
+		if errors.As(first, &gone) {
+			return errors.New(string(gone))
+		}
+		return first
+	}
+	return ctx.Err()
+}
+
+// doShipIn takes the tar stream from the relay and unpacks it into Dir.
+func (a *Agent) doShipIn(ctx context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSShipArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if err := shipName(args.Name); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	dir := filepath.Clean(args.Dir)
+	if _, err := os.Lstat(filepath.Join(dir, args.Name)); err == nil && args.Conflict != "replace" && args.Conflict != "skip" {
+		return proto.TaskResult{Error: filepath.Join(dir, args.Name) + " уже существует"}
+	}
+	if err := os.MkdirAll(dir, 0o755); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	pr, pw := io.Pipe()
+	go func() {
+		for i := 0; ; i++ {
+			var data []byte
+			var last bool
+			err := a.xferRequest(ctx, func(ctx context.Context) (*http.Request, error) {
+				return http.NewRequestWithContext(ctx, http.MethodGet, a.relayURL(args.Relay, i), nil)
+			}, func(resp *http.Response) error {
+				b, err := io.ReadAll(io.LimitReader(resp.Body, int64(args.Chunk)+1))
+				data, last = b, resp.Header.Get("X-Last") != ""
+				return err
+			})
+			if err == nil {
+				_, err = pw.Write(data)
+			}
+			if err != nil {
+				pw.CloseWithError(err)
+				return
+			}
+			if last {
+				pw.Close()
+				return
+			}
+		}
+	}()
+	u := &unpacker{dir: dir, name: args.Name, conflict: args.Conflict}
+	if os.Geteuid() == 0 {
+		// New things belong to whoever owns the folder they land in.
+		if info, err := os.Stat(dir); err == nil {
+			if st, ok := info.Sys().(*syscall.Stat_t); ok {
+				u.uid, u.gid, u.chown = int(st.Uid), int(st.Gid), true
+			}
+		}
+	}
+	err := u.unpack(tar.NewReader(pr))
+	if err == nil {
+		// Whatever follows the archive's end is read off, so the sender
+		// finishes.
+		_, err = io.Copy(io.Discard, pr)
+	}
+	pr.CloseWithError(errors.New("распаковка закончена"))
+	if err != nil {
+		var gone errXferGone
+		if errors.As(err, &gone) {
+			err = errors.New(string(gone))
+		}
+		return proto.TaskResult{Error: err.Error()}
+	}
+	data, _ := json.Marshal(map[string]int{"done": u.done, "skipped": u.skipped})
+	return proto.TaskResult{OK: true, Data: data}
+}
+
+// unpacker writes a tar stream into dir, every entry under name, following
+// the conflict rule for what is there already: folders merge, and files are
+// replaced or kept.
+type unpacker struct {
+	dir, name, conflict string
+	uid, gid            int
+	chown               bool
+	done, skipped       int
+}
+
+func (u *unpacker) unpack(tr *tar.Reader) error {
+	var skipUnder string
+	for {
+		hdr, err := tr.Next()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		clean := path.Clean(hdr.Name)
+		if clean != u.name && !strings.HasPrefix(clean, u.name+"/") {
+			return fmt.Errorf("в архиве чужой путь %q", hdr.Name)
+		}
+		target := filepath.Join(u.dir, filepath.FromSlash(clean))
+		if skipUnder != "" && strings.HasPrefix(target, skipUnder) {
+			continue
+		}
+		have, err := os.Lstat(target)
+		exists := err == nil
+		if exists && !(hdr.Typeflag == tar.TypeDir && have.IsDir()) {
+			switch u.conflict {
+			case "skip":
+				u.skipped++
+				if hdr.Typeflag == tar.TypeDir {
+					skipUnder = target + string(filepath.Separator)
+				}
+				continue
+			case "replace":
+				if have.IsDir() || hdr.Typeflag != tar.TypeReg {
+					if err := os.RemoveAll(target); err != nil {
+						return err
+					}
+				}
+			default:
+				return fmt.Errorf("%s уже существует", target)
+			}
+		}
+		mode := os.FileMode(hdr.Mode).Perm()
+		switch hdr.Typeflag {
+		case tar.TypeDir:
+			if !exists || !have.IsDir() {
+				if err := os.MkdirAll(target, mode|0o700); err != nil {
+					return err
+				}
+				_ = os.Chmod(target, mode)
+				u.own(target)
+			}
+		case tar.TypeReg:
+			if err := u.writeFile(target, tr, mode, hdr.ModTime); err != nil {
+				return err
+			}
+		case tar.TypeSymlink:
+			if err := os.Symlink(hdr.Linkname, target); err != nil {
+				return err
+			}
+			u.own(target)
+		default:
+			continue
+		}
+		u.done++
+	}
+}
+
+// writeFile writes next to the target first and puts it in place when all of
+// it is there.
+func (u *unpacker) writeFile(target string, r io.Reader, mode os.FileMode, mtime time.Time) error {
+	tmp, err := os.CreateTemp(filepath.Dir(target), "."+filepath.Base(target)+".lpra-*")
+	if err != nil {
+		return err
+	}
+	if _, err := io.Copy(tmp, r); err != nil {
+		tmp.Close()
+		os.Remove(tmp.Name())
+		return err
+	}
+	if err := tmp.Close(); err != nil {
+		os.Remove(tmp.Name())
+		return err
+	}
+	_ = os.Chmod(tmp.Name(), mode)
+	_ = os.Chtimes(tmp.Name(), mtime, mtime)
+	u.own(tmp.Name())
+	if err := os.Rename(tmp.Name(), target); err != nil {
+		os.Remove(tmp.Name())
+		return err
+	}
+	return nil
+}
+
+func (u *unpacker) own(p string) {
+	if u.chown {
+		_ = os.Lchown(p, u.uid, u.gid)
+	}
+}
+
+// shq quotes s for a POSIX shell.
+func shq(s string) string { return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'" }
+
+// shipSSH writes the tar stream into tar on the SSH host, in Dir.
+func (a *Agent) shipSSH(ctx context.Context, args proto.FSShipArgs, src string, m *shipMeter) error {
+	client, _, err := a.sshConnect(ctx, *args.SSH, func(_, note string) { m.note.Store(note) })
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+	go func() { <-ctx.Done(); client.Close() }()
+	dir := args.Dir
+	if dir == "" {
+		dir = "."
+	}
+	target := strings.TrimSuffix(dir, "/") + "/" + args.Name
+
+	// What tar is there, and whether the target is.
+	m.note.Store("проверка на той стороне")
+	out, err := sshRun(client, "command -v tar >/dev/null 2>&1 || echo LPRA_NOTAR; tar --version 2>/dev/null | head -n 1; test -e "+shq(target)+" -o -L "+shq(target)+" && echo LPRA_EXISTS")
+	if err != nil {
+		return err
+	}
+	if strings.Contains(out, "LPRA_NOTAR") {
+		return errors.New("на той стороне нет tar")
+	}
+	if strings.Contains(out, "LPRA_EXISTS") && args.Conflict != "replace" && args.Conflict != "skip" {
+		return errors.New(target + " там уже существует")
+	}
+	gnu := strings.Contains(out, "GNU tar")
+	flags := ""
+	switch args.Conflict {
+	case "skip":
+		if gnu {
+			flags = " --skip-old-files"
+		} else {
+			flags = " -k"
+		}
+	case "replace":
+		if gnu {
+			flags = " --overwrite"
+		}
+	}
+
+	sess, err := client.NewSession()
+	if err != nil {
+		return err
+	}
+	defer sess.Close()
+	var stderr bytes.Buffer
+	sess.Stderr = &limitBuf{b: &stderr, max: 4096}
+	stdin, err := sess.StdinPipe()
+	if err != nil {
+		return err
+	}
+	cmd := "mkdir -p -- " + shq(dir) + " && cd -- " + shq(dir) + " && tar -xf -" + flags
+	if err := sess.Start(cmd); err != nil {
+		return err
+	}
+	m.note.Store("")
+	packErr := packTar(ctx, stdin, src, args.Name, m)
+	stdin.Close()
+	waitErr := sess.Wait()
+	msg := strings.TrimSpace(stderr.String())
+	if packErr != nil {
+		if msg != "" {
+			return fmt.Errorf("%v (%s)", packErr, msg)
+		}
+		return packErr
+	}
+	if waitErr != nil {
+		var ee *ssh.ExitError
+		if errors.As(waitErr, &ee) && msg != "" {
+			return errors.New("tar на той стороне: " + msg)
+		}
+		return waitErr
+	}
+	return nil
+}
+
+// sshRun runs a command and returns its output.
+func sshRun(c *ssh.Client, cmd string) (string, error) {
+	s, err := c.NewSession()
+	if err != nil {
+		return "", err
+	}
+	defer s.Close()
+	out, err := s.Output(cmd)
+	var ee *ssh.ExitError
+	if errors.As(err, &ee) {
+		err = nil // the checks may exit non-zero; what they print is the answer
+	}
+	return string(out), err
+}
+
+type limitBuf struct {
+	b   *bytes.Buffer
+	max int
+}
+
+func (l *limitBuf) Write(p []byte) (int, error) {
+	if room := l.max - l.b.Len(); room > 0 {
+		l.b.Write(p[:min(len(p), room)])
+	}
+	return len(p), nil
+}

internal/agent/speed.go

@@ -119,7 +119,7 @@ func (a *Agent) speedDown(ctx context.Context, path string, window time.Duration
 }
 
 func (a *Agent) speedRequest(ctx context.Context, method, path string, body io.Reader) (*http.Response, error) {
-	req, err := http.NewRequestWithContext(ctx, method, a.cfg.Host+path, body)
+	req, err := http.NewRequestWithContext(ctx, method, a.host()+path, body)
 	if err != nil {
 		return nil, err
 	}

internal/agent/sqlitedb.go

@@ -0,0 +1,512 @@
+package agent
+
+import (
+	"context"
+	"database/sql"
+	"encoding/hex"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	_ "modernc.org/sqlite"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// SQLite databases are read and changed here, through SQLite itself, so a
+// database that is in use keeps its locks and journal: a value is set with an
+// UPDATE, not by writing the file over.
+
+// dbCell is one value as the panel shows and sends it: t is "i" (integer),
+// "r" (real), "s" (text), "b" (blob, v its size, not editable) or "n" (NULL).
+type dbCell struct {
+	T string `json:"t"`
+	V string `json:"v,omitempty"`
+}
+
+func cellOf(v any) dbCell {
+	switch x := v.(type) {
+	case nil:
+		return dbCell{T: "n"}
+	case int64:
+		return dbCell{T: "i", V: strconv.FormatInt(x, 10)}
+	case float64:
+		return dbCell{T: "r", V: strconv.FormatFloat(x, 'g', -1, 64)}
+	case string:
+		return dbCell{T: "s", V: x}
+	case []byte:
+		return dbCell{T: "b", V: strconv.Itoa(len(x))}
+	case bool:
+		if x {
+			return dbCell{T: "i", V: "1"}
+		}
+		return dbCell{T: "i", V: "0"}
+	case time.Time:
+		return dbCell{T: "s", V: x.Format(time.RFC3339Nano)}
+	}
+	return dbCell{T: "s", V: fmt.Sprint(v)}
+}
+
+// value is what a cell becomes for SQLite.
+func (c dbCell) value() (any, error) {
+	switch c.T {
+	case "n":
+		return nil, nil
+	case "i":
+		n, err := strconv.ParseInt(strings.TrimSpace(c.V), 10, 64)
+		if err != nil {
+			return nil, fmt.Errorf("%q - не целое число", c.V)
+		}
+		return n, nil
+	case "r":
+		f, err := strconv.ParseFloat(strings.TrimSpace(c.V), 64)
+		if err != nil {
+			return nil, fmt.Errorf("%q - не число", c.V)
+		}
+		return f, nil
+	case "x":
+		b, err := hex.DecodeString(strings.ReplaceAll(c.V, " ", ""))
+		if err != nil {
+			return nil, errors.New("blob - нужны шестнадцатеричные байты")
+		}
+		return b, nil
+	}
+	return c.V, nil
+}
+
+type dbArgs struct {
+	Path   string            `json:"path"`
+	Table  string            `json:"table,omitempty"`
+	Offset int               `json:"offset,omitempty"`
+	Limit  int               `json:"limit,omitempty"`
+	Key    json.RawMessage   `json:"key,omitempty"`
+	Keys   []json.RawMessage `json:"keys,omitempty"`
+	Column string            `json:"column,omitempty"`
+	Value  *dbCell           `json:"value,omitempty"`
+	Values map[string]dbCell `json:"values,omitempty"`
+	SQL    string            `json:"sql,omitempty"`
+}
+
+func dbOpen(path string) (*sql.DB, error) {
+	info, err := os.Stat(path)
+	if err != nil {
+		return nil, err
+	}
+	if info.IsDir() {
+		return nil, errors.New("это каталог")
+	}
+	u := url.URL{Scheme: "file", Path: path}
+	db, err := sql.Open("sqlite", u.String()+"?mode=rw&_pragma=busy_timeout(5000)")
+	if err != nil {
+		return nil, err
+	}
+	db.SetMaxOpenConns(1)
+	return db, nil
+}
+
+func qid(name string) string { return `"` + strings.ReplaceAll(name, `"`, `""`) + `"` }
+
+// dbTable is a table's shape: its columns, and how a row is found again -
+// by rowid, by its primary key (a WITHOUT ROWID table), or not at all (a
+// view: shown, not changed).
+type dbTable struct {
+	Name    string     `json:"name"`
+	Type    string     `json:"type"`
+	Columns []dbColumn `json:"columns"`
+	Key     string     `json:"key"` // "rowid", "pk" or ""
+	// Alias is the INTEGER PRIMARY KEY column: another name for the rowid.
+	Alias string `json:"alias,omitempty"`
+	pk    []string
+}
+
+type dbColumn struct {
+	Name    string `json:"name"`
+	Type    string `json:"type"`
+	NotNull bool   `json:"notnull,omitempty"`
+	PK      bool   `json:"pk,omitempty"`
+	Default string `json:"default,omitempty"`
+}
+
+func dbTableInfo(ctx context.Context, db *sql.DB, name string) (*dbTable, error) {
+	t := &dbTable{Name: name}
+	if err := db.QueryRowContext(ctx, `SELECT type FROM sqlite_master WHERE name = ? AND type IN ('table','view')`, name).Scan(&t.Type); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, fmt.Errorf("нет таблицы %s", name)
+		}
+		return nil, err
+	}
+	rows, err := db.QueryContext(ctx, `SELECT name, type, "notnull", dflt_value, pk FROM pragma_table_info(?)`, name)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	type pkc struct {
+		n   int
+		col string
+	}
+	var pks []pkc
+	for rows.Next() {
+		var c dbColumn
+		var notnull, pk int
+		var dflt sql.NullString
+		if err := rows.Scan(&c.Name, &c.Type, &notnull, &dflt, &pk); err != nil {
+			return nil, err
+		}
+		c.NotNull, c.PK, c.Default = notnull == 1, pk > 0, dflt.String
+		if pk > 0 {
+			pks = append(pks, pkc{pk, c.Name})
+		}
+		t.Columns = append(t.Columns, c)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	for i := 1; i <= len(pks); i++ {
+		for _, p := range pks {
+			if p.n == i {
+				t.pk = append(t.pk, p.col)
+			}
+		}
+	}
+	if t.Type == "table" {
+		if r, err := db.QueryContext(ctx, `SELECT rowid FROM `+qid(name)+` LIMIT 0`); err == nil {
+			r.Close()
+			t.Key = "rowid"
+			if len(t.pk) == 1 {
+				for _, c := range t.Columns {
+					if c.Name == t.pk[0] && strings.EqualFold(strings.TrimSpace(c.Type), "INTEGER") {
+						t.Alias = c.Name
+					}
+				}
+			}
+		} else if len(t.pk) > 0 {
+			t.Key = "pk"
+		}
+	}
+	return t, nil
+}
+
+// where is the condition that finds the row by its key: a rowid, or the
+// primary key's cells in order.
+func (t *dbTable) where(key json.RawMessage) (string, []any, error) {
+	switch t.Key {
+	case "rowid":
+		var id int64
+		if err := json.Unmarshal(key, &id); err != nil {
+			var s string
+			if json.Unmarshal(key, &s) != nil {
+				return "", nil, errors.New("плохой ключ строки")
+			}
+			if id, err = strconv.ParseInt(s, 10, 64); err != nil {
+				return "", nil, errors.New("плохой ключ строки")
+			}
+		}
+		return "rowid = ?", []any{id}, nil
+	case "pk":
+		var cells []dbCell
+		if err := json.Unmarshal(key, &cells); err != nil || len(cells) != len(t.pk) {
+			return "", nil, errors.New("плохой ключ строки")
+		}
+		parts, args := make([]string, len(t.pk)), make([]any, len(t.pk))
+		for i, col := range t.pk {
+			v, err := cells[i].value()
+			if err != nil {
+				return "", nil, err
+			}
+			parts[i], args[i] = qid(col)+" IS ?", v
+		}
+		return strings.Join(parts, " AND "), args, nil
+	}
+	return "", nil, errors.New("строки этой таблицы нельзя менять: нет ни rowid, ни первичного ключа")
+}
+
+func (t *dbTable) column(name string) bool {
+	for _, c := range t.Columns {
+		if c.Name == name {
+			return true
+		}
+	}
+	return false
+}
+
+// dbTask runs one database task.
+func dbTask(env proto.TaskEnvelope) (any, error) {
+	var a dbArgs
+	if err := json.Unmarshal(env.Args, &a); err != nil {
+		return nil, err
+	}
+	db, err := dbOpen(a.Path)
+	if err != nil {
+		return nil, err
+	}
+	defer db.Close()
+	ctx, cancel := context.WithTimeout(context.Background(), 50*time.Second)
+	defer cancel()
+
+	if env.Type == proto.TaskDBTables {
+		rows, err := db.QueryContext(ctx, `SELECT name, type FROM sqlite_master WHERE type IN ('table','view') AND name NOT LIKE 'sqlite_%' ORDER BY type, name`)
+		if err != nil {
+			return nil, dbErr(err)
+		}
+		defer rows.Close()
+		type item struct {
+			Name string `json:"name"`
+			Type string `json:"type"`
+		}
+		out := []item{}
+		for rows.Next() {
+			var it item
+			if err := rows.Scan(&it.Name, &it.Type); err != nil {
+				return nil, err
+			}
+			out = append(out, it)
+		}
+		return map[string]any{"tables": out}, rows.Err()
+	}
+	if env.Type == proto.TaskDBSQL {
+		return dbSQL(ctx, db, a.SQL)
+	}
+
+	t, err := dbTableInfo(ctx, db, a.Table)
+	if err != nil {
+		return nil, dbErr(err)
+	}
+	switch env.Type {
+	case proto.TaskDBRows:
+		return dbRows(ctx, db, t, a.Offset, a.Limit)
+	case proto.TaskDBSet:
+		if !t.column(a.Column) || a.Value == nil {
+			return nil, errors.New("нет такого столбца")
+		}
+		cond, args, err := t.where(a.Key)
+		if err != nil {
+			return nil, err
+		}
+		v, err := a.Value.value()
+		if err != nil {
+			return nil, err
+		}
+		res, err := db.ExecContext(ctx, `UPDATE `+qid(t.Name)+` SET `+qid(a.Column)+` = ? WHERE `+cond, append([]any{v}, args...)...)
+		if err != nil {
+			return nil, dbErr(err)
+		}
+		if n, _ := res.RowsAffected(); n != 1 {
+			return nil, fmt.Errorf("изменено строк: %d - строку могли удалить или поменять", n)
+		}
+		// A key column changed: the row is found by its new key now.
+		out := map[string]any{}
+		switch {
+		case t.Key == "rowid" && a.Column == t.Alias:
+			args = []any{v}
+			out["key"] = a.Value.V
+		case t.Key == "pk":
+			var cells []dbCell
+			_ = json.Unmarshal(a.Key, &cells)
+			for i, col := range t.pk {
+				if col == a.Column {
+					args[i], cells[i] = v, *a.Value
+					out["key"] = cells
+				}
+			}
+		}
+		// What SQLite stored, after its type affinity.
+		var got any
+		_ = db.QueryRowContext(ctx, `SELECT `+qid(a.Column)+` FROM `+qid(t.Name)+` WHERE `+cond, args...).Scan(&got)
+		out["value"] = cellOf(got)
+		if k, ok := out["key"].([]dbCell); ok {
+			for i, col := range t.pk {
+				if col == a.Column {
+					k[i] = cellOf(got)
+				}
+			}
+		}
+		return out, nil
+	case proto.TaskDBAdd:
+		if t.Type != "table" {
+			return nil, errors.New("в представление строки не добавляются")
+		}
+		var cols, marks []string
+		var vals []any
+		for name, c := range a.Values {
+			if !t.column(name) {
+				return nil, fmt.Errorf("нет столбца %s", name)
+			}
+			v, err := c.value()
+			if err != nil {
+				return nil, err
+			}
+			cols, marks, vals = append(cols, qid(name)), append(marks, "?"), append(vals, v)
+		}
+		q := `INSERT INTO ` + qid(t.Name) + ` DEFAULT VALUES`
+		if len(cols) > 0 {
+			q = `INSERT INTO ` + qid(t.Name) + ` (` + strings.Join(cols, ", ") + `) VALUES (` + strings.Join(marks, ", ") + `)`
+		}
+		res, err := db.ExecContext(ctx, q, vals...)
+		if err != nil {
+			return nil, dbErr(err)
+		}
+		id, _ := res.LastInsertId()
+		return map[string]any{"rowid": id}, nil
+	case proto.TaskDBDel:
+		tx, err := db.BeginTx(ctx, nil)
+		if err != nil {
+			return nil, dbErr(err)
+		}
+		defer tx.Rollback()
+		n := int64(0)
+		for _, k := range a.Keys {
+			cond, args, err := t.where(k)
+			if err != nil {
+				return nil, err
+			}
+			res, err := tx.ExecContext(ctx, `DELETE FROM `+qid(t.Name)+` WHERE `+cond, args...)
+			if err != nil {
+				return nil, dbErr(err)
+			}
+			c, _ := res.RowsAffected()
+			n += c
+		}
+		if err := tx.Commit(); err != nil {
+			return nil, dbErr(err)
+		}
+		return map[string]any{"deleted": n}, nil
+	}
+	return nil, errors.New("неизвестная операция")
+}
+
+// dbRows is a page of a table's rows, with each row's key.
+func dbRows(ctx context.Context, db *sql.DB, t *dbTable, offset, limit int) (any, error) {
+	if limit <= 0 || limit > 1000 {
+		limit = 200
+	}
+	var total int64
+	_ = db.QueryRowContext(ctx, `SELECT COUNT(*) FROM `+qid(t.Name)).Scan(&total)
+	sel := make([]string, 0, len(t.Columns)+1)
+	if t.Key == "rowid" {
+		sel = append(sel, "rowid")
+	}
+	for _, c := range t.Columns {
+		sel = append(sel, qid(c.Name))
+	}
+	order := ""
+	switch t.Key {
+	case "rowid":
+		order = " ORDER BY rowid"
+	case "pk":
+		parts := make([]string, len(t.pk))
+		for i, c := range t.pk {
+			parts[i] = qid(c)
+		}
+		order = " ORDER BY " + strings.Join(parts, ", ")
+	}
+	rows, err := db.QueryContext(ctx, `SELECT `+strings.Join(sel, ", ")+` FROM `+qid(t.Name)+order+` LIMIT ? OFFSET ?`, limit, offset)
+	if err != nil {
+		return nil, dbErr(err)
+	}
+	defer rows.Close()
+	type row struct {
+		K any      `json:"k,omitempty"`
+		V []dbCell `json:"v"`
+	}
+	out := []row{}
+	n := len(sel)
+	for rows.Next() {
+		vals := make([]any, n)
+		ptrs := make([]any, n)
+		for i := range vals {
+			ptrs[i] = &vals[i]
+		}
+		if err := rows.Scan(ptrs...); err != nil {
+			return nil, err
+		}
+		r := row{}
+		if t.Key == "rowid" {
+			r.K = cellOf(vals[0]).V
+			vals = vals[1:]
+		}
+		for _, v := range vals {
+			r.V = append(r.V, cellOf(v))
+		}
+		if t.Key == "pk" {
+			key := make([]dbCell, len(t.pk))
+			for i, pk := range t.pk {
+				for j, c := range t.Columns {
+					if c.Name == pk {
+						key[i] = r.V[j]
+					}
+				}
+			}
+			r.K = key
+		}
+		out = append(out, r)
+	}
+	return map[string]any{"table": t, "total": total, "offset": offset, "rows": out}, rows.Err()
+}
+
+// dbSQL runs what was typed: a query gives up to 500 rows, anything else
+// how many rows it changed.
+func dbSQL(ctx context.Context, db *sql.DB, q string) (any, error) {
+	q = strings.TrimSpace(q)
+	if q == "" {
+		return nil, errors.New("пустой запрос")
+	}
+	head := strings.ToLower(strings.Fields(q)[0])
+	if head == "select" || head == "pragma" || head == "with" || head == "explain" || head == "values" {
+		rows, err := db.QueryContext(ctx, q)
+		if err != nil {
+			return nil, dbErr(err)
+		}
+		defer rows.Close()
+		cols, _ := rows.Columns()
+		out := [][]dbCell{}
+		more := false
+		for rows.Next() {
+			if len(out) == 500 {
+				more = true
+				break
+			}
+			vals := make([]any, len(cols))
+			ptrs := make([]any, len(cols))
+			for i := range vals {
+				ptrs[i] = &vals[i]
+			}
+			if err := rows.Scan(ptrs...); err != nil {
+				return nil, err
+			}
+			r := make([]dbCell, len(cols))
+			for i, v := range vals {
+				r[i] = cellOf(v)
+			}
+			out = append(out, r)
+		}
+		return map[string]any{"columns": cols, "rows": out, "more": more}, dbErr(rows.Err())
+	}
+	res, err := db.ExecContext(ctx, q)
+	if err != nil {
+		return nil, dbErr(err)
+	}
+	n, _ := res.RowsAffected()
+	return map[string]any{"changed": n}, nil
+}
+
+// dbErr says the common SQLite troubles in words.
+func dbErr(err error) error {
+	if err == nil {
+		return nil
+	}
+	m := err.Error()
+	switch {
+	case strings.Contains(m, "file is not a database"):
+		return errors.New("это не база SQLite")
+	case strings.Contains(m, "database is locked"), strings.Contains(m, "SQLITE_BUSY"):
+		return errors.New("база занята другой программой - попробуйте ещё раз")
+	case strings.Contains(m, "readonly"):
+		return errors.New("база только для чтения (нет прав на файл или его папку)")
+	}
+	return err
+}

internal/agent/ssh.go

@@ -0,0 +1,250 @@
+package agent
+
+import (
+	"bufio"
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// An SSH terminal: the agent connects to another host by SSH and bridges the
+// remote shell to the session, as it does a local one. The panel is told how
+// the connection goes (connecting, signing in, in) to show it.
+
+// sshKnownHosts holds the host keys seen, next to the agent's state: a host
+// is trusted the first time, and a changed key is refused.
+func (a *Agent) sshKnownHosts() string {
+	return filepath.Join(filepath.Dir(a.cfg.StatePath), "ssh_known_hosts")
+}
+
+var knownHostsMu sync.Mutex
+
+// hostKeyCheck trusts a new host and remembers its key; a host whose key
+// has changed since is refused, as ssh would.
+func (a *Agent) hostKeyCheck(seen *string) ssh.HostKeyCallback {
+	return func(hostname string, _ net.Addr, key ssh.PublicKey) error {
+		knownHostsMu.Lock()
+		defer knownHostsMu.Unlock()
+		fp := ssh.FingerprintSHA256(key)
+		*seen = fp
+		path := a.sshKnownHosts()
+		line := hostname + " " + key.Type() + " "
+		if f, err := os.Open(path); err == nil {
+			sc := bufio.NewScanner(f)
+			for sc.Scan() {
+				fields := strings.Fields(sc.Text())
+				if len(fields) != 3 || fields[0] != hostname {
+					continue
+				}
+				if fields[1] == key.Type() && fields[2] == fp {
+					f.Close()
+					return nil
+				}
+				if fields[1] == key.Type() {
+					f.Close()
+					return fmt.Errorf("ключ хоста %s изменился: был %s, теперь %s. Если так и должно быть, удалите строку с этим хостом из %s на агенте",
+						hostname, fields[2], fp, path)
+				}
+			}
+			f.Close()
+		}
+		_ = os.MkdirAll(filepath.Dir(path), 0o700)
+		f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
+		if err == nil {
+			_, _ = f.WriteString(line + fp + "\n")
+			f.Close()
+		}
+		return nil
+	}
+}
+
+// sshAuth is how to sign in: the key given, the password given (also
+// answered to keyboard-interactive prompts), or the agent user's own keys.
+func sshAuth(t proto.SSHTarget) ([]ssh.AuthMethod, error) {
+	var methods []ssh.AuthMethod
+	if t.Key != "" {
+		var signer ssh.Signer
+		var err error
+		if t.Passphrase != "" {
+			signer, err = ssh.ParsePrivateKeyWithPassphrase([]byte(t.Key), []byte(t.Passphrase))
+		} else {
+			signer, err = ssh.ParsePrivateKey([]byte(t.Key))
+		}
+		var missing *ssh.PassphraseMissingError
+		if errors.As(err, &missing) {
+			return nil, errors.New("ключ защищён фразой - введите её")
+		}
+		if err != nil {
+			return nil, fmt.Errorf("ключ не читается: %v", err)
+		}
+		methods = append(methods, ssh.PublicKeys(signer))
+	}
+	if t.Password != "" {
+		pw := t.Password
+		methods = append(methods, ssh.Password(pw),
+			ssh.KeyboardInteractive(func(_, _ string, qs []string, _ []bool) ([]string, error) {
+				ans := make([]string, len(qs))
+				for i := range ans {
+					ans[i] = pw
+				}
+				return ans, nil
+			}))
+	}
+	if len(methods) == 0 {
+		var signers []ssh.Signer
+		for _, n := range []string{"id_ed25519", "id_ecdsa", "id_rsa"} {
+			b, err := os.ReadFile(filepath.Join(homeDir(""), ".ssh", n))
+			if err != nil {
+				continue
+			}
+			if s, err := ssh.ParsePrivateKey(b); err == nil {
+				signers = append(signers, s)
+			}
+		}
+		if len(signers) == 0 {
+			return nil, errors.New("не задан ни пароль, ни ключ, и в ~/.ssh агента нет ключей без фразы")
+		}
+		methods = append(methods, ssh.PublicKeys(signers...))
+	}
+	return methods, nil
+}
+
+// sshShell is the remote shell as a stream: its output (stdout and stderr,
+// one on a PTY) to read, keystrokes to write.
+type sshShell struct {
+	client *ssh.Client
+	sess   *ssh.Session
+	stdin  io.WriteCloser
+	out    *io.PipeReader
+	once   sync.Once
+}
+
+func (s *sshShell) Read(b []byte) (int, error)  { return s.out.Read(b) }
+func (s *sshShell) Write(b []byte) (int, error) { return s.stdin.Write(b) }
+func (s *sshShell) Resize(cols, rows uint16) {
+	if cols > 0 && rows > 0 {
+		_ = s.sess.WindowChange(int(rows), int(cols))
+	}
+}
+func (s *sshShell) Close() error {
+	s.once.Do(func() {
+		_ = s.sess.Close()
+		_ = s.client.Close()
+		_ = s.out.Close()
+	})
+	return nil
+}
+
+// sshConnect connects and signs in to t, saying how it goes by status (the
+// SSHStatus steps). It returns the client and the host key's fingerprint.
+func (a *Agent) sshConnect(ctx context.Context, t proto.SSHTarget, status func(st, note string)) (*ssh.Client, string, error) {
+	if t.Port == 0 {
+		t.Port = 22
+	}
+	addr := net.JoinHostPort(t.Host, strconv.Itoa(t.Port))
+	auth, err := sshAuth(t)
+	if err != nil {
+		return nil, "", err
+	}
+	status(proto.SSHDial, "подключение к "+addr)
+	d := net.Dialer{Timeout: 15 * time.Second, KeepAlive: 30 * time.Second}
+	conn, err := d.DialContext(ctx, "tcp", addr)
+	if err != nil {
+		return nil, "", fmt.Errorf("не подключиться к %s: %v", addr, err)
+	}
+	status(proto.SSHAuth, "вход как "+t.User)
+	var fp string
+	_ = conn.SetDeadline(time.Now().Add(30 * time.Second))
+	c, chans, reqs, err := ssh.NewClientConn(conn, addr, &ssh.ClientConfig{
+		User:            t.User,
+		Auth:            auth,
+		HostKeyCallback: a.hostKeyCheck(&fp),
+		Timeout:         15 * time.Second,
+	})
+	if err != nil {
+		conn.Close()
+		msg := strings.TrimPrefix(err.Error(), "ssh: handshake failed: ")
+		if strings.Contains(msg, "unable to authenticate") {
+			msg = "сервер не принял вход как " + t.User + " - проверьте пароль или ключ"
+		}
+		return nil, "", errors.New(msg)
+	}
+	_ = conn.SetDeadline(time.Time{})
+	return ssh.NewClient(c, chans, reqs), fp, nil
+}
+
+// runSSH connects to the target and bridges its shell to the session.
+func (a *Agent) runSSH(parent context.Context, sid string, t proto.SSHTarget) {
+	status := func(st, note string) {
+		a.postOut(context.Background(), sid, proto.OutMessage{Status: st, Note: note})
+	}
+	fail := func(err error) {
+		log.Printf("ssh %s: %v", sid, err)
+		status(proto.SSHErr, err.Error())
+		a.postOut(context.Background(), sid, proto.OutMessage{Data: b64.EncodeToString([]byte("\x1b[31m" + err.Error() + "\x1b[0m\r\n"))})
+		a.postOut(context.Background(), sid, proto.OutMessage{Exit: true})
+	}
+	client, fp, err := a.sshConnect(parent, t, status)
+	if err != nil {
+		fail(err)
+		return
+	}
+	port := t.Port
+	if port == 0 {
+		port = 22
+	}
+	addr := net.JoinHostPort(t.Host, strconv.Itoa(port))
+	sess, err := client.NewSession()
+	if err != nil {
+		client.Close()
+		fail(fmt.Errorf("сессия не открылась: %v", err))
+		return
+	}
+	modes := ssh.TerminalModes{ssh.ECHO: 1, ssh.TTY_OP_ISPEED: 115200, ssh.TTY_OP_OSPEED: 115200}
+	if err := sess.RequestPty("xterm-256color", 24, 80, modes); err != nil {
+		sess.Close()
+		client.Close()
+		fail(fmt.Errorf("терминал не выделен: %v", err))
+		return
+	}
+	stdin, _ := sess.StdinPipe()
+	pr, pw := io.Pipe()
+	sess.Stdout = pw
+	sess.Stderr = pw
+	if err := sess.Shell(); err != nil {
+		sess.Close()
+		client.Close()
+		fail(fmt.Errorf("оболочка не запустилась: %v", err))
+		return
+	}
+	sh := &sshShell{client: client, sess: sess, stdin: stdin, out: pr}
+	go func() { _ = sess.Wait(); pw.Close() }()
+	// Keep-alives, so a dead host is noticed and the session ends.
+	go func() {
+		tk := time.NewTicker(30 * time.Second)
+		defer tk.Stop()
+		for range tk.C {
+			if _, _, err := client.SendRequest("keepalive@openssh.com", true, nil); err != nil {
+				sh.Close()
+				return
+			}
+		}
+	}()
+	log.Printf("ssh %s: %s@%s up (host key %s)", sid, t.User, addr, fp)
+	status(proto.SSHOK, t.User+"@"+addr)
+	a.bridgeStream(parent, sid, sh, sh.Resize)
+	log.Printf("ssh %s: ended", sid)
+}

internal/agent/task.go

@@ -22,6 +22,14 @@ func (a *Agent) runTask(ctx context.Context, taskID string) {
 		res = a.doUpdate()
 	case proto.TaskSysSpeed:
 		res = a.doSpeed(ctx, env)
+	case proto.TaskFSPut:
+		res = a.doFSPut(ctx, env)
+	case proto.TaskFSSend:
+		res = a.doFSSend(ctx, env)
+	case proto.TaskFSShipOut:
+		res = a.doShipOut(ctx, env)
+	case proto.TaskFSShipIn:
+		res = a.doShipIn(ctx, env)
 	default:
 		res = a.execTask(env)
 	}
@@ -30,7 +38,7 @@ func (a *Agent) runTask(ctx context.Context, taskID string) {
 
 func (a *Agent) fetchTask(ctx context.Context, taskID string) (proto.TaskEnvelope, error) {
 	var env proto.TaskEnvelope
-	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, a.cfg.Host+"/api/agent/task/"+taskID, nil)
+	req, _ := http.NewRequestWithContext(ctx, http.MethodGet, a.host()+"/api/agent/task/"+taskID, nil)
 	a.authHeaders(req)
 	resp, err := a.http.Do(req)
 	if err != nil {
@@ -46,7 +54,7 @@ func (a *Agent) fetchTask(ctx context.Context, taskID string) (proto.TaskEnvelop
 
 func (a *Agent) postResult(ctx context.Context, taskID string, res proto.TaskResult) {
 	body, _ := json.Marshal(res)
-	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.cfg.Host+"/api/agent/task/"+taskID+"/result", bytes.NewReader(body))
+	req, _ := http.NewRequestWithContext(ctx, http.MethodPost, a.host()+"/api/agent/task/"+taskID+"/result", bytes.NewReader(body))
 	a.authHeaders(req)
 	req.Header.Set("Content-Type", "application/json")
 	resp, err := a.http.Do(req)

internal/agent/terminal.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"sync"
+	"syscall"
+	"time"
 
 	"github.com/creack/pty"
 )
@@ -12,6 +15,27 @@ import (
 type PTY struct {
 	cmd    *exec.Cmd
 	f      *os.File
+	exited chan struct{} // closed once the shell has exited
+	once   sync.Once
+}
+
+// hangupGrace is how long a shell gets after the hangup to save its history
+// and exit before it is killed.
+const hangupGrace = 3 * time.Second
+
+// openPTYs are the terminals running now, to close on shutdown.
+var openPTYs sync.Map // *PTY -> struct{}
+
+// CloseTerminals hangs up every open terminal and waits for them, so the
+// shells save their history before the agent exits.
+func CloseTerminals() {
+	var wg sync.WaitGroup
+	openPTYs.Range(func(k, _ any) bool {
+		wg.Add(1)
+		go func() { defer wg.Done(); k.(*PTY).Close() }()
+		return true
+	})
+	wg.Wait()
 }
 
 // StartPTY launches a login shell attached to a new PTY. With user empty (or
@@ -20,8 +44,16 @@ type PTY struct {
 // `su -l`, which only a root agent can do without a password.
 func StartPTY(user string) (*PTY, error) {
 	var cmd *exec.Cmd
+	env := append(os.Environ(), "TERM=xterm-256color")
 	if user == "" || user == currentUser() {
 		cmd = exec.Command(defaultShell(), "-l")
+		// A login shell does not change directory by itself: it would start
+		// where the service runs, "/". Start it at home, and say where home
+		// is, as a root service often has no $HOME.
+		if home := homeDir(""); isDir(home) {
+			cmd.Dir = home
+			env = append(env, "HOME="+home)
+		}
 	} else {
 		if !validUserName(user) {
 			return nil, fmt.Errorf("недопустимое имя пользователя %q", user)
@@ -37,13 +69,26 @@ func StartPTY(user string) (*PTY, error) {
 			return nil, fmt.Errorf("su не найден: %w", err)
 		}
 		cmd = exec.Command(su, "-l", user)
+		// su -l goes to the user's home; starting there too keeps the shell
+		// out of "/" should it not.
+		if home := homeDir(user); isDir(home) {
+			cmd.Dir = home
 		}
-	cmd.Env = append(os.Environ(), "TERM=xterm-256color")
+	}
+	cmd.Env = env
 	f, err := pty.Start(cmd)
 	if err != nil {
 		return nil, err
 	}
-	return &PTY{cmd: cmd, f: f}, nil
+	p := &PTY{cmd: cmd, f: f, exited: make(chan struct{})}
+	go func() { _ = cmd.Wait(); close(p.exited) }()
+	openPTYs.Store(p, struct{}{})
+	return p, nil
+}
+
+func isDir(p string) bool {
+	info, err := os.Stat(p)
+	return err == nil && info.IsDir()
 }
 
 // Read reads terminal output.
@@ -60,12 +105,24 @@ func (p *PTY) Resize(cols, rows uint16) {
 	_ = pty.Setsize(p.f, &pty.Winsize{Rows: rows, Cols: cols})
 }
 
-// Close terminates the shell and releases the PTY.
+// Close hangs the terminal up as a closed window would: the shell gets
+// SIGHUP, saves its history and exits. One that does not within hangupGrace
+// is killed. Safe to call more than once.
 func (p *PTY) Close() error {
-	err := p.f.Close()
+	var err error
-	if p.cmd.Process != nil {
+	p.once.Do(func() {
-		_ = p.cmd.Process.Kill()
+		// Closing the master hangs up the session; the signal to the
+		// shell's process group makes sure it hears, through su as well.
+		err = p.f.Close()
+		pid := p.cmd.Process.Pid
+		_ = syscall.Kill(-pid, syscall.SIGHUP)
+		select {
+		case <-p.exited:
+		case <-time.After(hangupGrace):
+			_ = syscall.Kill(-pid, syscall.SIGKILL)
+			<-p.exited
 		}
-	_ = p.cmd.Wait()
+		openPTYs.Delete(p)
+	})
 	return err
 }

internal/agent/tunnel.go

@@ -26,9 +26,7 @@ func (a *Agent) runTunnel(ctx context.Context, addr string) {
 			case <-ctx.Done():
 				return
 			}
-			if backoff < 15*time.Second {
+			backoff = min(backoff*2, retryCap)
-				backoff *= 2
-			}
 			continue
 		}
 		backoff = time.Second
@@ -96,8 +94,14 @@ func (t *tunClient) write(f tunnel.Frame) error {
 	return tunnel.WriteFrame(t.conn, f)
 }
 
+// tunnelSilence is how long the tunnel may say nothing before it is taken
+// for dead: the server pings every 20 s, so this is three missed pings - a
+// connection a NAT forgot while the machine slept, say.
+const tunnelSilence = 65 * time.Second
+
 func (t *tunClient) readLoop() error {
 	for {
+		_ = t.conn.SetReadDeadline(time.Now().Add(tunnelSilence))
 		f, err := tunnel.ReadFrame(t.conn)
 		if err != nil {
 			t.shutdown()
@@ -207,9 +211,7 @@ func (a *Agent) runUDP(ctx context.Context, addr string) {
 			case <-ctx.Done():
 				return
 			}
-			if backoff < 15*time.Second {
+			backoff = min(backoff*2, retryCap)
-				backoff *= 2
-			}
 			continue
 		}
 		backoff = time.Second

internal/agent/update.go

@@ -3,31 +3,40 @@ package agent
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"runtime"
+	"strings"
+	"syscall"
 	"time"
 
 	"github.com/x-grk/longpolling-remote-access/internal/proto"
 )
 
-// doUpdate downloads the latest agent binary for this platform, atomically
+// doUpdate downloads the latest agent binary for this platform, replaces the
-// replaces the running executable, and schedules a service restart. It never
+// running executable and restarts the service. It runs as root when it can:
-// uninstalls - only updates.
+// the agent's own user if that is root, otherwise sudo when it needs no
+// password. It never uninstalls - only updates.
 func (a *Agent) doUpdate() proto.TaskResult {
 	exe, err := os.Executable()
 	if err != nil {
 		return proto.TaskResult{Error: "не удалось определить путь бинарника: " + err.Error()}
 	}
 	exe, _ = filepath.EvalSymlinks(exe)
+	sudo := ""
+	if os.Geteuid() != 0 {
+		sudo = sudoPath()
+	}
 
-	url := fmt.Sprintf("%s/download/agent-%s-%s", a.cfg.Host, runtime.GOOS, runtime.GOARCH)
+	url := fmt.Sprintf("%s/download/agent-%s-%s", a.host(), runtime.GOOS, runtime.GOARCH)
 	req, _ := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
-	resp, err := a.http.Do(req)
+	resp, err := a.stream.Do(req)
 	if err != nil {
 		return proto.TaskResult{Error: "скачивание: " + err.Error()}
 	}
@@ -36,41 +45,125 @@ func (a *Agent) doUpdate() proto.TaskResult {
 		return proto.TaskResult{Error: "скачивание: сервер вернул " + resp.Status}
 	}
 
-	tmp := exe + ".new"
+	// The new binary lands next to the old one, or, when root's hand is
-	f, err := os.OpenFile(tmp, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0o755)
+	// needed to put it there, in a temporary folder first.
-	if err != nil {
+	dir := filepath.Dir(exe)
-		return proto.TaskResult{Error: "создание файла: " + err.Error()}
+	if sudo != "" {
+		dir = ""
 	}
-	if _, err := io.Copy(f, resp.Body); err != nil {
+	f, err := os.CreateTemp(dir, ".lpagent-new-*")
-		f.Close()
+	if err != nil {
-		os.Remove(tmp)
+		return proto.TaskResult{Error: "создание файла: " + err.Error() + userNote()}
+	}
+	tmp := f.Name()
+	defer os.Remove(tmp)
+	n, err := io.Copy(f, io.LimitReader(resp.Body, 256<<20))
+	if cerr := f.Close(); err == nil {
+		err = cerr
+	}
+	if err != nil {
 		return proto.TaskResult{Error: "запись: " + err.Error()}
 	}
-	f.Close()
+	if err := checkBinary(tmp, n); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if err := os.Chmod(tmp, 0o755); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
 
-	// Atomic replace: renaming over a running executable is allowed on Linux;
+	how := "от " + currentUser()
-	// the live process keeps the old inode until it restarts.
+	if sudo != "" {
-	if err := os.Rename(tmp, exe); err != nil {
+		// install copies it in place under a new inode, as a rename would.
-		os.Remove(tmp)
+		if out, err := exec.Command(sudo, "-n", "install", "-m", "0755", tmp, exe).CombinedOutput(); err != nil {
-		return proto.TaskResult{Error: "замена бинарника: " + err.Error()}
+			return proto.TaskResult{Error: "замена бинарника через sudo: " + strings.TrimSpace(string(out)+" "+err.Error())}
+		}
+		how = "через sudo"
+	} else if err := os.Rename(tmp, exe); err != nil {
+		// Renaming over a running executable is allowed; the live process
+		// keeps the old inode until it restarts.
+		return proto.TaskResult{Error: "замена бинарника: " + err.Error() + userNote()}
 	}
 
 	// Restart shortly, after the result has been reported.
 	go func() {
 		time.Sleep(1500 * time.Millisecond)
-		restartSelf()
+		restartSelf(exe, sudo)
 	}()
 
-	data, _ := json.Marshal(map[string]string{"status": "обновлено, перезапуск"})
+	data, _ := json.Marshal(map[string]string{"status": "обновлено " + how + ", перезапуск"})
 	return proto.TaskResult{OK: true, Data: data}
 }
 
-// restartSelf restarts the agent so the new binary takes effect.
+// sudoPath is sudo when it lets this user run commands without a password.
-func restartSelf() {
+func sudoPath() string {
+	p, err := exec.LookPath("sudo")
+	if err != nil {
+		return ""
+	}
+	if exec.Command(p, "-n", "true").Run() != nil {
+		return ""
+	}
+	return p
+}
+
+func userNote() string {
+	if os.Geteuid() == 0 {
+		return ""
+	}
+	return " (агент запущен от " + currentUser() + ", без root и sudo без пароля - обновите установщиком)"
+}
+
+// checkBinary makes sure what came is a program for this system, not an
+// error page: a binary of a sensible size with the right header.
+func checkBinary(path string, size int64) error {
+	if size < 1<<20 {
+		return fmt.Errorf("скачанный файл слишком мал (%d байт) - не похоже на агента", size)
+	}
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	var magic [4]byte
+	if _, err := io.ReadFull(f, magic[:]); err != nil {
+		return err
+	}
+	ok := false
+	switch runtime.GOOS {
+	case "linux":
+		ok = string(magic[:]) == "\x7fELF"
+	case "darwin":
+		ok = magic == [4]byte{0xcf, 0xfa, 0xed, 0xfe} || magic == [4]byte{0xca, 0xfe, 0xba, 0xbe}
+	default:
+		ok = true
+	}
+	if !ok {
+		return errors.New("скачанный файл - не программа для " + runtime.GOOS)
+	}
+	return nil
+}
+
+// restartSelf starts the new binary. Under systemd the service is restarted
+// (queued, so it goes on after this process is stopped); otherwise the
+// process replaces itself with the new binary.
+func restartSelf(exe, sudo string) {
+	if os.Getenv("INVOCATION_ID") != "" {
 		if path, err := exec.LookPath("systemctl"); err == nil {
-		_ = exec.Command(path, "restart", "lpagent").Start()
+			args := []string{"--no-block", "restart", "lpagent"}
+			cmd := exec.Command(path, args...)
+			if sudo != "" {
+				cmd = exec.Command(sudo, append([]string{"-n", path}, args...)...)
+			}
+			if cmd.Run() == nil {
 				return
 			}
-	// No systemd (e.g. launchd/manual run): exit so the supervisor restarts us.
+		}
+		// systemd brings a service that stopped back up (Restart=always).
 		os.Exit(0)
 	}
+	CloseTerminals()
+	if err := syscall.Exec(exe, os.Args, os.Environ()); err != nil {
+		log.Printf("update: restart: %v", err)
+		os.Exit(0)
+	}
+}

internal/agent/users.go

@@ -39,6 +39,8 @@ func dispatchTask(env proto.TaskEnvelope) (any, error) {
 		var a proto.SysUserAddArgs
 		_ = json.Unmarshal(env.Args, &a)
 		return nil, addUser(a)
+	case proto.TaskDBTables, proto.TaskDBRows, proto.TaskDBSet, proto.TaskDBAdd, proto.TaskDBDel, proto.TaskDBSQL:
+		return dbTask(env)
 	}
 	return dispatchFS(env)
 }

internal/agent/wslink.go

@@ -0,0 +1,179 @@
+package agent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/coder/websocket"
+	"github.com/coder/websocket/wsjson"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// The WebSocket to the server: control messages arrive on it as soon as they
+// are queued, and terminal and http-forward sessions send and take their
+// bytes over it instead of a request each. When it drops, sessions carry on
+// over plain requests.
+
+const wsPing = 20 * time.Second
+
+type wsLink struct {
+	c     *websocket.Conn
+	ctx   context.Context
+	mu    sync.Mutex
+	subs  map[string]chan wsIn
+	asked map[string]bool // sessions whose input was asked for
+	done  chan struct{}
+	stop  context.CancelFunc
+}
+
+// close drops the link: the agent then connects again, to the address in
+// use by then.
+func (l *wsLink) close() { l.stop() }
+
+// wsIn is what the server sent for a session: its input, or that it is over.
+type wsIn struct {
+	frames []proto.InFrame
+	gone   bool
+}
+
+func (l *wsLink) send(m proto.WSMsg) error {
+	ctx, cancel := context.WithTimeout(l.ctx, 30*time.Second)
+	defer cancel()
+	return wsjson.Write(ctx, l.c, m)
+}
+
+// subscribe asks the server for a session's input on this link, once, and
+// returns where it arrives; nil when the link cannot take it.
+func (l *wsLink) subscribe(sid string) chan wsIn {
+	l.mu.Lock()
+	ch := l.subs[sid]
+	if ch == nil {
+		ch = make(chan wsIn, 64)
+		l.subs[sid] = ch
+	}
+	fresh := !l.subscribed(sid)
+	l.mu.Unlock()
+	if fresh && l.send(proto.WSMsg{T: "sub", SID: sid}) != nil {
+		return nil
+	}
+	return ch
+}
+
+// subscribed marks a session as asked for; l.mu is held.
+func (l *wsLink) subscribed(sid string) bool {
+	if l.asked == nil {
+		l.asked = map[string]bool{}
+	}
+	if l.asked[sid] {
+		return true
+	}
+	l.asked[sid] = true
+	return false
+}
+
+func (l *wsLink) unsubscribe(sid string) {
+	l.mu.Lock()
+	delete(l.subs, sid)
+	delete(l.asked, sid)
+	l.mu.Unlock()
+}
+
+func (l *wsLink) deliver(sid string, in wsIn) {
+	l.mu.Lock()
+	ch := l.subs[sid]
+	l.mu.Unlock()
+	if ch == nil {
+		return
+	}
+	select {
+	case ch <- in:
+	case <-l.done:
+	}
+}
+
+// runWS holds the WebSocket until it ends, dispatching what comes on it.
+func (a *Agent) runWS(ctx context.Context) error {
+	u := a.host() + "/api/agent/ws"
+	u = "ws" + strings.TrimPrefix(u, "http")
+	hdr := http.Header{}
+	hdr.Set("X-Agent-Id", a.state.AgentID)
+	hdr.Set("Authorization", "Bearer "+a.state.Token)
+	hdr.Set("X-Agent-Version", Version)
+	hdr.Set("X-Agent-User", currentUser())
+	dctx, dcancel := context.WithTimeout(ctx, 15*time.Second)
+	c, resp, err := websocket.Dial(dctx, u, &websocket.DialOptions{
+		HTTPClient: a.stream, HTTPHeader: hdr, CompressionMode: websocket.CompressionDisabled,
+	})
+	dcancel()
+	if err != nil {
+		if resp != nil {
+			a.applyTransport(resp.Header.Get(proto.TransportHeader))
+			return fmt.Errorf("server answered %s", resp.Status)
+		}
+		return err
+	}
+	c.SetReadLimit(8 << 20)
+	lctx, lcancel := context.WithCancel(ctx)
+	l := &wsLink{c: c, ctx: lctx, subs: map[string]chan wsIn{}, done: make(chan struct{}), stop: lcancel}
+	a.link.Store(l)
+	defer func() {
+		a.link.CompareAndSwap(l, nil)
+		close(l.done)
+		lcancel()
+		c.CloseNow()
+	}()
+	log.Printf("connected by websocket")
+	a.reached()
+	go func() {
+		t := time.NewTicker(wsPing)
+		defer t.Stop()
+		for {
+			select {
+			case <-lctx.Done():
+				return
+			case <-t.C:
+				pctx, pcancel := context.WithTimeout(lctx, 15*time.Second)
+				err := c.Ping(pctx)
+				pcancel()
+				if err != nil {
+					lcancel()
+					return
+				}
+			}
+		}
+	}()
+	for {
+		var m proto.WSMsg
+		if err := wsjson.Read(lctx, c, &m); err != nil {
+			if errors.Is(err, context.Canceled) && ctx.Err() == nil {
+				return errors.New("no answer to ping")
+			}
+			return err
+		}
+		switch m.T {
+		case "ctrl":
+			if m.Ctrl != nil {
+				// Sessions live on the agent's context: they outlast the link.
+				a.dispatch(ctx, *m.Ctrl)
+			}
+		case "cfg":
+			a.applyTunnelAddr(ctx, m.Tunnel)
+			a.learnAddrs(m.Main, m.Fallback)
+			a.applyTransport(m.Transport)
+			if a.mode() == proto.TransportLP {
+				return errors.New("set to long polling")
+			}
+		case "in":
+			l.deliver(m.SID, wsIn{frames: m.Frames})
+		case "gone":
+			l.deliver(m.SID, wsIn{gone: true})
+		}
+	}
+}

internal/proto/proto.go

@@ -18,8 +18,23 @@ const (
 	CtrlOpenForward = "open_forward"
 	// CtrlTask tells the agent to fetch and run the one-shot task TaskID.
 	CtrlTask = "task"
+	// CtrlOpenSSH tells the agent to open an SSH connection to SSH and bridge
+	// its shell to the session id, as a terminal.
+	CtrlOpenSSH = "open_ssh"
 )
 
+// SSHTarget is where an SSH terminal connects and how it signs in: a
+// password, a private key (PEM or OpenSSH, with its passphrase if it has
+// one), or, with neither, the agent user's own keys in ~/.ssh.
+type SSHTarget struct {
+	Host       string `json:"host"`
+	Port       int    `json:"port,omitempty"`
+	User       string `json:"user"`
+	Password   string `json:"password,omitempty"`
+	Key        string `json:"key,omitempty"`
+	Passphrase string `json:"passphrase,omitempty"`
+}
+
 // EnrollRequest is sent once by a freshly installed agent.
 type EnrollRequest struct {
 	Name     string `json:"name"`
@@ -43,6 +58,44 @@ type ControlMessage struct {
 	Port      int        `json:"port,omitempty"`    // CtrlOpenForward: client-side port to dial
 	TaskID    string     `json:"task_id,omitempty"` // CtrlTask
 	User      string     `json:"user,omitempty"`    // CtrlOpenTerminal: OS user for the shell ("" = the agent's own)
+	SSH       *SSHTarget `json:"ssh,omitempty"`     // CtrlOpenSSH
+}
+
+// Transports an agent can reach the server by.
+const (
+	TransportAuto = "auto" // WebSocket, long polling while it cannot connect
+	TransportWS   = "ws"   // WebSocket only
+	TransportLP   = "lp"   // long polling only
+)
+
+// TransportHeader carries the agent's transport setting on poll and config
+// answers.
+const TransportHeader = "X-Transport"
+
+// FallbackHeader carries the server's direct address (one not behind a
+// proxy like Cloudflare) on poll and config answers, for the agent to turn
+// to when the main one is out of reach.
+const FallbackHeader = "X-Fallback-Host"
+
+// MainHeader carries the server's main address beside FallbackHeader, for an
+// agent set to the direct one to fall back to the main one.
+const MainHeader = "X-Main-Host"
+
+// WSMsg is one message on an agent's WebSocket, either way. Server to agent:
+// "ctrl" (Ctrl, as a control poll would answer), "cfg" (Tunnel and
+// Transport, also a keep-alive), "in" (Frames for session SID), "gone"
+// (session SID is over). Agent to server: "sub" (send the input of session
+// SID here), "out" (Out of session SID).
+type WSMsg struct {
+	T         string          `json:"t"`
+	Ctrl      *ControlMessage `json:"ctrl,omitempty"`
+	SID       string          `json:"sid,omitempty"`
+	Frames    []InFrame       `json:"frames,omitempty"`
+	Out       *OutMessage     `json:"out,omitempty"`
+	Tunnel    string          `json:"tunnel,omitempty"`
+	Transport string          `json:"transport,omitempty"`
+	Fallback  string          `json:"fallback,omitempty"`
+	Main      string          `json:"main,omitempty"`
 }
 
 // Terminal / stream frame types on the session "in" channel (server -> agent).
@@ -70,8 +123,20 @@ type InBatch struct {
 type OutMessage struct {
 	Data string `json:"data,omitempty"` // base64 bytes
 	Exit bool   `json:"exit,omitempty"`
+	// Status tells the panel how an SSH terminal's connection goes: one of
+	// the SSHStatus values, with Note to show.
+	Status string `json:"status,omitempty"`
+	Note   string `json:"note,omitempty"`
 }
 
+// The steps of an SSH terminal's connection, as OutMessage.Status.
+const (
+	SSHDial = "dial" // connecting to the host
+	SSHAuth = "auth" // the host answered, signing in
+	SSHOK   = "ok"   // signed in, the shell runs
+	SSHErr  = "err"  // it failed; Note says why
+)
+
 // --- one-shot tasks (file manager, native in the agent) ---
 
 const (
@@ -85,18 +150,44 @@ const (
 	TaskFSZip      = "fs.zip"      // zip selected paths (native archive/zip)
 	TaskFSMove     = "fs.move"     // move/rename
 	TaskFSDownload = "fs.download" // read a whole file (larger cap) for browser download
+	TaskFSStat     = "fs.stat"     // a file's properties: type, size, mode, owner
+	TaskFSChmod    = "fs.chmod"    // change mode and owner, of a folder's contents too
+	TaskFSCopy     = "fs.copy"     // copy or move, with a rule for what is already there
+	TaskFSPut      = "fs.put"      // write a file the browser sends in pieces
+	TaskFSSend     = "fs.send"     // send a file to the browser in pieces
 
 	TaskSysUpdate  = "sys.update"  // download the latest agent binary and restart
 	TaskSysUsers   = "sys.users"   // report the agent's user and the login-capable users
 	TaskSysUserAdd = "sys.useradd" // create a new OS user
 	TaskSysStat    = "sys.stat"    // CPU load, RAM and disk usage right now
 	TaskSysSpeed   = "sys.speed"   // measure the link to the server (ping, down, up)
+	TaskDBTables   = "db.tables"   // an SQLite database's tables and views
+	TaskDBRows     = "db.rows"     // a page of a table's rows, with each row's key
+	TaskDBSet      = "db.set"      // set one value of one row
+	TaskDBAdd      = "db.add"      // add a row
+	TaskDBDel      = "db.del"      // delete rows by their keys
+	TaskDBSQL      = "db.sql"      // run a statement typed in the panel
+	TaskFSShipOut  = "fs.ship.out" // pack a file or folder and send it to another machine
+	TaskFSShipIn   = "fs.ship.in"  // unpack what another machine sends
 )
 
 // FSReadCap bounds how many bytes TaskFSRead returns (5 MiB). The panel lets a
 // file be edited only when it fits, so that a save never cuts it short.
 const FSReadCap = 5 * 1024 * 1024
 
+// FSFileCap bounds a file sent either way in pieces (TaskFSPut, TaskFSSend).
+const FSFileCap = 512 << 20
+
+// FSXferArgs are the arguments of TaskFSPut and TaskFSSend: the file, and the
+// transfer on the server whose pieces carry it - GET them for a put, POST them
+// for a send, Chunk bytes each. Size is a put's length; -1 for a send.
+type FSXferArgs struct {
+	Path  string `json:"path"`
+	Xfer  string `json:"xfer"`
+	Size  int64  `json:"size"`
+	Chunk int    `json:"chunk"`
+}
+
 // TaskEnvelope is what the agent fetches for a task id.
 type TaskEnvelope struct {
 	Type string          `json:"type"`
@@ -131,6 +222,47 @@ type FSMoveArgs struct {
 	Dst string `json:"dst"`
 }
 
+// FSStatResult is returned for TaskFSStat. Mode holds the permission bits
+// with setuid, setgid and sticky (07777). Users and Groups are the names on
+// the machine, offered when choosing an owner.
+type FSStatResult struct {
+	Path   string   `json:"path"`
+	IsDir  bool     `json:"is_dir"`
+	Link   string   `json:"link,omitempty"` // where a symlink points
+	Size   int64    `json:"size"`
+	MTime  int64    `json:"mtime"`
+	Mode   uint32   `json:"mode"`
+	UID    int      `json:"uid"`
+	GID    int      `json:"gid"`
+	Owner  string   `json:"owner"`
+	Group  string   `json:"group"`
+	Users  []string `json:"users"`
+	Groups []string `json:"groups"`
+}
+
+// FSChmodArgs are the arguments of TaskFSChmod. Mode nil, Owner or Group
+// empty leave that as it is. Recursive applies to everything inside a folder
+// as well, Only narrowing it to "files" or "dirs".
+type FSChmodArgs struct {
+	Path      string  `json:"path"`
+	Mode      *uint32 `json:"mode,omitempty"`
+	Owner     string  `json:"owner,omitempty"`
+	Group     string  `json:"group,omitempty"`
+	Recursive bool    `json:"recursive,omitempty"`
+	Only      string  `json:"only,omitempty"`
+}
+
+// FSCopyArgs are the arguments of TaskFSCopy: Src goes to Dst (the full new
+// path), copied or, with Move, moved. Conflict says what to do when Dst is
+// already there: "error" (the default) stops, "replace" puts Src in its place,
+// "skip" keeps it. Folders on both sides are merged under replace and skip.
+type FSCopyArgs struct {
+	Src      string `json:"src"`
+	Dst      string `json:"dst"`
+	Move     bool   `json:"move,omitempty"`
+	Conflict string `json:"conflict,omitempty"`
+}
+
 // FSEntry is one directory entry.
 type FSEntry struct {
 	Name  string `json:"name"`
@@ -200,3 +332,30 @@ type SysSpeedResult struct {
 	// counted on its own side by then.
 	Partial bool `json:"partial,omitempty"`
 }
+
+// FSShipArgs are the arguments of TaskFSShipOut and TaskFSShipIn: Src (on the
+// sending machine) lands in Dir as Name (on the receiving one), following
+// Conflict as FSCopyArgs does. The sender packs it as a tar stream and either
+// posts it in pieces of Chunk bytes to Relay on the server, for the receiver
+// to take, or with SSH set writes it to tar on that host itself, and with
+// Move then deletes Src. Both report to Job how far they are.
+type FSShipArgs struct {
+	Src      string     `json:"src,omitempty"`
+	Name     string     `json:"name"`
+	Dir      string     `json:"dir"`
+	Conflict string     `json:"conflict,omitempty"`
+	Move     bool       `json:"move,omitempty"`
+	Relay    string     `json:"relay,omitempty"`
+	Chunk    int        `json:"chunk,omitempty"`
+	Job      string     `json:"job,omitempty"`
+	SSH      *SSHTarget `json:"ssh,omitempty"`
+}
+
+// ShipProgress is what a sending machine reports: bytes of files sent out of
+// Total, and files done.
+type ShipProgress struct {
+	Total int64  `json:"total"`
+	Done  int64  `json:"done"`
+	Files int    `json:"files"`
+	Note  string `json:"note,omitempty"` // what is going on: connecting, signing in
+}

internal/server/config.go

@@ -3,6 +3,7 @@ package server
 import (
 	"crypto/rand"
 	"encoding/hex"
+	"net/url"
 	"strconv"
 
 	lpra "github.com/x-grk/longpolling-remote-access"
@@ -14,9 +15,11 @@ const (
 	cfgEnrollSecret = "enroll_secret"
 	cfgSetupDone    = "setup_done"
 	cfgInstallCode  = "install_code"
+	cfgInstallLen   = "install_code_len"
 	cfgUfwEnabled   = "ufw_enabled"
 	cfgTunnelHost   = "tunnel_host"
 	cfgTunnelPort   = "tunnel_port"
+	cfgDirectAddr   = "direct_address"
 )
 
 // DefaultHostAddress is the public URL agents dial by default. It is baked into
@@ -52,7 +55,7 @@ func (db *DB) ensureDefaults() error {
 		return err
 	}
 	if code == "" {
-		if err := db.SetConfig(cfgInstallCode, shortCode()); err != nil {
+		if err := db.SetConfig(cfgInstallCode, shortCode(db.InstallCodeLen())); err != nil {
 			return err
 		}
 	}
@@ -67,6 +70,23 @@ func (db *DB) HostAddress() string {
 	return v
 }
 
+// DirectAddress is the server's direct URL, one that is not behind a proxy
+// like Cloudflare: the agents' fallback, and a way to install when the main
+// address is out of reach. Empty when not set.
+func (db *DB) DirectAddress() string {
+	v, _ := db.GetConfig(cfgDirectAddr)
+	return v
+}
+
+// directHost is the direct address's host name, without scheme and port.
+func directHost(addr string) string {
+	u, err := url.Parse(addr)
+	if err != nil {
+		return ""
+	}
+	return u.Hostname()
+}
+
 func (db *DB) EnrollSecret() string {
 	v, _ := db.GetConfig(cfgEnrollSecret)
 	return v
@@ -125,16 +145,36 @@ func randToken() string {
 	return hex.EncodeToString(b)
 }
 
-// shortCode returns a short, URL-safe, typo-resistant code for install links.
+// Install code length: 3 by default, up to 24.
-// It avoids ambiguous characters (0/O, 1/l/I) so it is easy to read and type.
+const (
-func shortCode() string {
+	installCodeMin = 3
-	const alphabet = "abcdefghjkmnpqrstuvwxyz23456789"
+	installCodeMax = 24
-	b := make([]byte, 7)
+	installCodeDef = 3
+)
+
+// InstallCodeLen is how many characters a new install code has.
+func (db *DB) InstallCodeLen() int {
+	v, _ := db.GetConfig(cfgInstallLen)
+	if n, err := strconv.Atoi(v); err == nil && n >= installCodeMin && n <= installCodeMax {
+		return n
+	}
+	return installCodeDef
+}
+
+// shortCode returns a random code of n English letters and digits for the
+// /i/<code> install link. Every character is equally likely.
+func shortCode(n int) string {
+	const alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+	out := make([]byte, 0, n)
+	b := make([]byte, 1)
+	for len(out) < n {
 		if _, err := rand.Read(b); err != nil {
 			panic("crypto/rand failed: " + err.Error())
 		}
-	for i := range b {
+		// 248 = 4 * 62: drop the rest, so no character comes up more often.
-		b[i] = alphabet[int(b[i])%len(alphabet)]
+		if b[0] < 248 {
+			out = append(out, alphabet[int(b[0])%len(alphabet)])
 		}
-	return string(b)
+	}
+	return string(out)
 }

internal/server/db.go

@@ -85,6 +85,16 @@ CREATE TABLE IF NOT EXISTS ufw_rules (
     created_at INTEGER NOT NULL,
     UNIQUE(port, proto)
 );
+CREATE TABLE IF NOT EXISTS admin_keys (
+    id          INTEGER PRIMARY KEY AUTOINCREMENT,
+    admin_id    INTEGER NOT NULL REFERENCES admins(id) ON DELETE CASCADE,
+    cred_id     BLOB UNIQUE NOT NULL,
+    public_key  BLOB NOT NULL,
+    sign_count  INTEGER NOT NULL DEFAULT 0,
+    name        TEXT NOT NULL DEFAULT '',
+    created_at  INTEGER NOT NULL,
+    last_used   INTEGER NOT NULL DEFAULT 0
+);
 CREATE TABLE IF NOT EXISTS forward_rules (
     id          INTEGER PRIMARY KEY AUTOINCREMENT,
     agent_id    TEXT NOT NULL,
@@ -107,6 +117,15 @@ CREATE TABLE IF NOT EXISTS forward_rules (
 		`ALTER TABLE agents ADD COLUMN login_user TEXT NOT NULL DEFAULT ''`,
 		`ALTER TABLE forward_rules ADD COLUMN no_ufw INTEGER NOT NULL DEFAULT 0`,
 		`ALTER TABLE forward_rules ADD COLUMN label TEXT NOT NULL DEFAULT ''`,
+		`ALTER TABLE admins ADD COLUMN password_off INTEGER NOT NULL DEFAULT 0`,
+		`ALTER TABLE agents ADD COLUMN transport TEXT NOT NULL DEFAULT 'auto'`,
+		`ALTER TABLE admins ADD COLUMN pin_hash TEXT NOT NULL DEFAULT ''`,
+		`ALTER TABLE admins ADD COLUMN role TEXT NOT NULL DEFAULT 'admin'`,
+		`ALTER TABLE admins ADD COLUMN pw_locked INTEGER NOT NULL DEFAULT 0`,
+		`CREATE TABLE IF NOT EXISTS admin_agents (
+		    admin_id INTEGER NOT NULL REFERENCES admins(id) ON DELETE CASCADE,
+		    agent_id TEXT NOT NULL,
+		    PRIMARY KEY (admin_id, agent_id))`,
 	} {
 		if _, err := db.sql.Exec(alter); err != nil && !strings.Contains(err.Error(), "duplicate column") {
 			return err
@@ -142,24 +161,56 @@ func (db *DB) CountAdmins() (int, error) {
 }
 
 func (db *DB) CreateAdmin(username, passHash string) error {
-	_, err := db.sql.Exec(
+	_, err := db.CreateUser(username, passHash, RoleAdmin)
-		`INSERT INTO admins(username, pass_hash, created_at) VALUES(?, ?, ?)`,
-		username, passHash, time.Now().Unix())
 	return err
 }
 
-// Admin is one row of the admins table.
+// CreateUser adds a panel user with the role given and returns its id.
+func (db *DB) CreateUser(username, passHash, role string) (int64, error) {
+	res, err := db.sql.Exec(
+		`INSERT INTO admins(username, pass_hash, created_at, role) VALUES(?, ?, ?, ?)`,
+		username, passHash, time.Now().Unix(), role)
+	if err != nil {
+		return 0, err
+	}
+	return res.LastInsertId()
+}
+
+// Roles of panel users: an admin sees and runs everything; a user only the
+// machines given to them, and none of the settings.
+const (
+	RoleAdmin = "admin"
+	RoleUser  = "user"
+)
+
+// Admin is one row of the admins table: a panel user, an admin or not.
 type Admin struct {
 	ID       int64
 	Username string
 	PassHash string
+	Role     string
+	// PwLocked keeps the user from turning the password sign-in on or off
+	// themselves: an admin set it.
+	PwLocked bool
+}
+
+// IsAdmin reports whether the user has the run of the whole panel.
+func (a *Admin) IsAdmin() bool { return a != nil && a.Role != RoleUser }
+
+const adminCols = `id, username, pass_hash, role, pw_locked`
+
+func scanAdmin(row interface{ Scan(...any) error }) (*Admin, error) {
+	a := &Admin{}
+	var locked int
+	if err := row.Scan(&a.ID, &a.Username, &a.PassHash, &a.Role, &locked); err != nil {
+		return nil, err
+	}
+	a.PwLocked = locked == 1
+	return a, nil
 }
 
 func (db *DB) AdminByUsername(username string) (*Admin, error) {
-	a := &Admin{}
+	a, err := scanAdmin(db.sql.QueryRow(`SELECT `+adminCols+` FROM admins WHERE username = ?`, username))
-	err := db.sql.QueryRow(
-		`SELECT id, username, pass_hash FROM admins WHERE username = ?`, username).
-		Scan(&a.ID, &a.Username, &a.PassHash)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}
@@ -167,27 +218,215 @@ func (db *DB) AdminByUsername(username string) (*Admin, error) {
 }
 
 func (db *DB) ListAdmins() ([]Admin, error) {
-	rows, err := db.sql.Query(`SELECT id, username FROM admins ORDER BY username`)
+	rows, err := db.sql.Query(`SELECT ` + adminCols + ` FROM admins ORDER BY role, username`)
 	if err != nil {
 		return nil, err
 	}
 	defer rows.Close()
 	var out []Admin
 	for rows.Next() {
-		var a Admin
+		a, err := scanAdmin(rows)
-		if err := rows.Scan(&a.ID, &a.Username); err != nil {
+		if err != nil {
 			return nil, err
 		}
-		out = append(out, a)
+		out = append(out, *a)
 	}
 	return out, rows.Err()
 }
 
+// CountRole is how many users have the role.
+func (db *DB) CountRole(role string) int {
+	var n int
+	_ = db.sql.QueryRow(`SELECT COUNT(*) FROM admins WHERE role = ?`, role).Scan(&n)
+	return n
+}
+
+func (db *DB) SetUserRole(id int64, role string) error {
+	_, err := db.sql.Exec(`UPDATE admins SET role = ? WHERE id = ?`, role, id)
+	return err
+}
+
+func (db *DB) SetPwLocked(id int64, locked bool) error {
+	_, err := db.sql.Exec(`UPDATE admins SET pw_locked = ? WHERE id = ?`, boolInt(locked), id)
+	return err
+}
+
+// UserAgents are the machines a user may use.
+func (db *DB) UserAgents(adminID int64) map[string]bool {
+	out := map[string]bool{}
+	rows, err := db.sql.Query(`SELECT agent_id FROM admin_agents WHERE admin_id = ?`, adminID)
+	if err != nil {
+		return out
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var id string
+		if rows.Scan(&id) == nil {
+			out[id] = true
+		}
+	}
+	return out
+}
+
+// SetUserAgents gives the user exactly these machines.
+func (db *DB) SetUserAgents(adminID int64, agentIDs []string) error {
+	tx, err := db.sql.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec(`DELETE FROM admin_agents WHERE admin_id = ?`, adminID); err != nil {
+		return err
+	}
+	for _, id := range agentIDs {
+		if _, err := tx.Exec(`INSERT OR IGNORE INTO admin_agents(admin_id, agent_id) VALUES(?, ?)`, adminID, id); err != nil {
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
+// CanUseAgent reports whether the user may use the machine.
+func (db *DB) CanUseAgent(a *Admin, agentID string) bool {
+	if a == nil {
+		return false
+	}
+	if a.IsAdmin() {
+		return true
+	}
+	var n int
+	_ = db.sql.QueryRow(`SELECT COUNT(*) FROM admin_agents WHERE admin_id = ? AND agent_id = ?`, a.ID, agentID).Scan(&n)
+	return n > 0
+}
+
 func (db *DB) DeleteAdmin(id int64) error {
 	_, err := db.sql.Exec(`DELETE FROM admins WHERE id = ?`, id)
 	return err
 }
 
+// AdminKey is a passkey an admin signs in with.
+type AdminKey struct {
+	ID        int64
+	AdminID   int64
+	CredID    []byte
+	PublicKey []byte // PKIX DER
+	SignCount uint32
+	Name      string
+	CreatedAt int64
+	LastUsed  int64
+}
+
+func (db *DB) AdminByID(id int64) (*Admin, error) {
+	a, err := scanAdmin(db.sql.QueryRow(`SELECT `+adminCols+` FROM admins WHERE id = ?`, id))
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return a, err
+}
+
+func (db *DB) AddAdminKey(k AdminKey) error {
+	_, err := db.sql.Exec(
+		`INSERT INTO admin_keys(admin_id, cred_id, public_key, sign_count, name, created_at) VALUES(?, ?, ?, ?, ?, ?)`,
+		k.AdminID, k.CredID, k.PublicKey, k.SignCount, k.Name, time.Now().Unix())
+	return err
+}
+
+func (db *DB) ListAdminKeys(adminID int64) ([]AdminKey, error) {
+	rows, err := db.sql.Query(
+		`SELECT id, admin_id, cred_id, public_key, sign_count, name, created_at, last_used
+		   FROM admin_keys WHERE admin_id = ? ORDER BY id`, adminID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []AdminKey
+	for rows.Next() {
+		var k AdminKey
+		if err := rows.Scan(&k.ID, &k.AdminID, &k.CredID, &k.PublicKey, &k.SignCount, &k.Name, &k.CreatedAt, &k.LastUsed); err != nil {
+			return nil, err
+		}
+		out = append(out, k)
+	}
+	return out, rows.Err()
+}
+
+// PasswordOff tells an admin who turned the password off: then only a
+// passkey signs them in. It holds only while they have one.
+func (db *DB) PasswordOff(adminID int64) bool {
+	var off int
+	_ = db.sql.QueryRow(`SELECT password_off FROM admins WHERE id = ?`, adminID).Scan(&off)
+	return off == 1 && db.CountAdminKeys(adminID) > 0
+}
+
+// AdminPin is the hash of the admin's PIN, "" when there is none.
+func (db *DB) AdminPin(adminID int64) string {
+	var h string
+	_ = db.sql.QueryRow(`SELECT pin_hash FROM admins WHERE id = ?`, adminID).Scan(&h)
+	return h
+}
+
+func (db *DB) SetAdminPin(adminID int64, pinHash string) error {
+	_, err := db.sql.Exec(`UPDATE admins SET pin_hash = ? WHERE id = ?`, pinHash, adminID)
+	return err
+}
+
+func (db *DB) SetAdminPassword(adminID int64, passHash string) error {
+	_, err := db.sql.Exec(`UPDATE admins SET pass_hash = ? WHERE id = ?`, passHash, adminID)
+	return err
+}
+
+func (db *DB) SetPasswordOff(adminID int64, off bool) error {
+	v := 0
+	if off {
+		v = 1
+	}
+	_, err := db.sql.Exec(`UPDATE admins SET password_off = ? WHERE id = ?`, v, adminID)
+	return err
+}
+
+// CountAdminKeys is how many passkeys an admin has.
+func (db *DB) CountAdminKeys(adminID int64) int {
+	var n int
+	_ = db.sql.QueryRow(`SELECT COUNT(*) FROM admin_keys WHERE admin_id = ?`, adminID).Scan(&n)
+	return n
+}
+
+func (db *DB) AdminKeyByCredID(credID []byte) (*AdminKey, error) {
+	k := &AdminKey{}
+	err := db.sql.QueryRow(
+		`SELECT id, admin_id, cred_id, public_key, sign_count, name, created_at, last_used
+		   FROM admin_keys WHERE cred_id = ?`, credID).
+		Scan(&k.ID, &k.AdminID, &k.CredID, &k.PublicKey, &k.SignCount, &k.Name, &k.CreatedAt, &k.LastUsed)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return k, err
+}
+
+func (db *DB) UseAdminKey(id int64, signCount uint32) error {
+	_, err := db.sql.Exec(`UPDATE admin_keys SET sign_count = ?, last_used = ? WHERE id = ?`, signCount, time.Now().Unix(), id)
+	return err
+}
+
+// DeleteAdminKey removes a passkey; with the last one gone, the password
+// signs the admin in again.
+func (db *DB) DeleteAdminKey(adminID, id int64) error {
+	if _, err := db.sql.Exec(`DELETE FROM admin_keys WHERE admin_id = ? AND id = ?`, adminID, id); err != nil {
+		return err
+	}
+	if db.CountAdminKeys(adminID) == 0 {
+		return db.SetPasswordOff(adminID, false)
+	}
+	return nil
+}
+
+func (db *DB) DeleteAdminKeys(adminID int64) error {
+	if _, err := db.sql.Exec(`DELETE FROM admin_keys WHERE admin_id = ?`, adminID); err != nil {
+		return err
+	}
+	return db.SetPasswordOff(adminID, false)
+}
+
 // --- admin sessions ---
 
 func (db *DB) CreateSession(id string, adminID int64, ttl time.Duration) error {
@@ -200,12 +439,10 @@ func (db *DB) CreateSession(id string, adminID int64, ttl time.Duration) error {
 
 // SessionAdmin returns the admin for a live (non-expired) session, or nil.
 func (db *DB) SessionAdmin(sessionID string) (*Admin, error) {
-	a := &Admin{}
+	a, err := scanAdmin(db.sql.QueryRow(
-	err := db.sql.QueryRow(
+		`SELECT a.id, a.username, a.pass_hash, a.role, a.pw_locked
-		`SELECT a.id, a.username, a.pass_hash
 		   FROM admin_sessions s JOIN admins a ON a.id = s.admin_id
-		  WHERE s.id = ? AND s.expires_at > ?`, sessionID, time.Now().Unix()).
+		  WHERE s.id = ? AND s.expires_at > ?`, sessionID, time.Now().Unix()))
-		Scan(&a.ID, &a.Username, &a.PassHash)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}
@@ -230,6 +467,7 @@ type Agent struct {
 	Version   string
 	RunUser   string // OS user the agent process runs as (reported by the agent)
 	LoginUser string // OS user terminals are opened as; "" = RunUser
+	Transport string // auto, ws or lp: how the agent is to reach us
 	LastSeen  time.Time
 }
 
@@ -259,8 +497,8 @@ func (db *DB) GetAgent(id string) (*Agent, error) {
 	a := &Agent{}
 	var last int64
 	err := db.sql.QueryRow(
-		`SELECT id, name, hostname, os, arch, token_hash, version, run_user, login_user, last_seen FROM agents WHERE id = ?`, id).
+		`SELECT id, name, hostname, os, arch, token_hash, version, run_user, login_user, transport, last_seen FROM agents WHERE id = ?`, id).
-		Scan(&a.ID, &a.Name, &a.Hostname, &a.OS, &a.Arch, &a.TokenHash, &a.Version, &a.RunUser, &a.LoginUser, &last)
+		Scan(&a.ID, &a.Name, &a.Hostname, &a.OS, &a.Arch, &a.TokenHash, &a.Version, &a.RunUser, &a.LoginUser, &a.Transport, &last)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}
@@ -291,6 +529,11 @@ func (db *DB) ListAgents() ([]Agent, error) {
 	return out, rows.Err()
 }
 
+func (db *DB) SetAgentTransport(id, transport string) error {
+	_, err := db.sql.Exec(`UPDATE agents SET transport = ? WHERE id = ?`, transport, id)
+	return err
+}
+
 func (db *DB) TouchAgent(id string) error {
 	_, err := db.sql.Exec(`UPDATE agents SET last_seen = ? WHERE id = ?`, time.Now().Unix(), id)
 	return err
@@ -311,6 +554,9 @@ func (db *DB) SetAgentLoginUser(id, user string) error {
 
 func (db *DB) DeleteAgent(id string) error {
 	_, err := db.sql.Exec(`DELETE FROM agents WHERE id = ?`, id)
+	if err == nil {
+		_, _ = db.sql.Exec(`DELETE FROM admin_agents WHERE agent_id = ?`, id)
+	}
 	return err
 }
 
@@ -487,3 +733,10 @@ func (db *DB) Audit(adminID int64, agentID, action string) {
 		`INSERT INTO audit(admin_id, agent_id, action, at) VALUES(?, ?, ?, ?)`,
 		adminID, agentID, action, time.Now().Unix())
 }
+
+func boolInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}

internal/server/fsstream.go

@@ -0,0 +1,623 @@
+package server
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"path"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// Files go between the browser and the agent in pieces. Each piece is a
+// request of its own, small enough for any proxy in front (Cloudflare takes
+// 100 MB a request at most), and one that fails is sent again instead of the
+// whole file. Several pieces are in flight at once, so a good link stays as
+// busy as it would with one long stream. The server holds only a few pieces
+// of a transfer: whoever sends waits while they wait to be taken.
+//
+// A download keeps one plain response towards the browser, which a proxy
+// passes on whatever its size: links, previews and the hex editor read it.
+
+const (
+	// xferChunk is the size of a piece.
+	xferChunk = 4 << 20
+	// xferBuffer is how many pieces of a transfer the server holds.
+	xferBuffer = 8
+	// xferWait is how long a request waits for its piece, or for room for it,
+	// before it is told to ask again: well under a proxy's timeout.
+	xferWait = 50 * time.Second
+	// xferIdle ends a transfer nobody has touched for this long.
+	xferIdle = 10 * time.Minute
+	// xferTimeout bounds one transfer, however slow the links.
+	xferTimeout = 2 * time.Hour
+)
+
+// fsLegacyCap is the most an agent that predates the pieces can take in or
+// hand over: the file goes base64 inside a task then.
+const fsLegacyCap = 32 << 20
+
+// xfer is one file on its way.
+type xfer struct {
+	id, agentID string
+
+	mu      sync.Mutex
+	changed chan struct{} // closed and replaced on every change
+	size    int64         // -1 until known
+	n       int           // pieces in all, once the size is known
+	chunks  map[int][]byte
+	// low is the first piece still to go: the ones below it were written by
+	// the agent (upload) or to the browser (download).
+	low    int
+	sized  chan struct{} // closed once the size is known
+	err    string        // why the transfer failed
+	done   bool
+	result proto.TaskResult
+	last   time.Time
+}
+
+func pieces(size int64) int {
+	if size <= 0 {
+		return 1 // an empty file is one empty piece
+	}
+	return int((size + xferChunk - 1) / xferChunk)
+}
+
+// pieceLen is how long piece i of the file is.
+func (x *xfer) pieceLen(i int) int64 {
+	return min(int64(xferChunk), x.size-int64(i)*xferChunk)
+}
+
+// notify wakes whoever waits on the transfer; x.mu is held.
+func (x *xfer) notify() {
+	x.last = time.Now()
+	close(x.changed)
+	x.changed = make(chan struct{})
+}
+
+// await waits until ready() holds and returns true with x.mu held; false,
+// with it free, when the wait ran out or ctx ended.
+func (x *xfer) await(ctx context.Context, d time.Duration, ready func() bool) bool {
+	t := time.NewTimer(d)
+	defer t.Stop()
+	for {
+		x.mu.Lock()
+		if ready() {
+			return true
+		}
+		ch := x.changed
+		x.mu.Unlock()
+		select {
+		case <-ch:
+		case <-t.C:
+			return false
+		case <-ctx.Done():
+			return false
+		}
+	}
+}
+
+func (x *xfer) fail(msg string) {
+	x.mu.Lock()
+	if x.err == "" && !x.done {
+		x.err = msg
+		x.chunks = nil
+		x.notify()
+	}
+	x.mu.Unlock()
+}
+
+func (x *xfer) finish(res proto.TaskResult) {
+	x.mu.Lock()
+	x.done, x.result, x.chunks = true, res, nil
+	x.notify()
+	x.mu.Unlock()
+}
+
+// setSize records the file's size; false when it differs from the one known.
+func (x *xfer) setSize(size int64) bool {
+	x.mu.Lock()
+	defer x.mu.Unlock()
+	if x.size >= 0 {
+		return x.size == size
+	}
+	x.size, x.n = size, pieces(size)
+	close(x.sized)
+	x.notify()
+	return true
+}
+
+// put stores piece i once there is room for it, and answers with the HTTP
+// status for its sender. A piece already taken or held is accepted again: it
+// is a retry.
+func (x *xfer) put(ctx context.Context, i int, data []byte) (int, string) {
+	if !x.await(ctx, xferWait, func() bool { return x.err != "" || x.done || i < x.low+xferBuffer }) {
+		return http.StatusServiceUnavailable, "нет места, повторите"
+	}
+	defer x.mu.Unlock()
+	if x.err != "" || x.done {
+		return http.StatusGone, x.gone()
+	}
+	if i < 0 || i >= x.n || int64(len(data)) != x.pieceLen(i) {
+		return http.StatusBadRequest, "не тот кусок"
+	}
+	if i >= x.low && x.chunks[i] == nil {
+		x.chunks[i] = data
+		x.notify()
+	}
+	return http.StatusNoContent, ""
+}
+
+// take hands over piece i, the next one in order, and lets it go.
+func (x *xfer) take(ctx context.Context, i int, d time.Duration) ([]byte, error) {
+	if !x.await(ctx, d, func() bool { return x.err != "" || x.chunks[i] != nil }) {
+		return nil, errors.New("кусок не пришёл вовремя")
+	}
+	defer x.mu.Unlock()
+	if x.err != "" {
+		return nil, errors.New(x.err)
+	}
+	data := x.chunks[i]
+	delete(x.chunks, i)
+	x.low = i + 1
+	x.notify()
+	return data, nil
+}
+
+func (x *xfer) gone() string {
+	if x.err != "" {
+		return x.err
+	}
+	return "передача закончена"
+}
+
+// Read makes an upload a plain reader, for an agent that takes a file whole.
+type xferReader struct {
+	ctx context.Context
+	x   *xfer
+	i   int
+	buf []byte
+}
+
+func (r *xferReader) Read(p []byte) (int, error) {
+	for len(r.buf) == 0 {
+		if r.i >= r.x.n {
+			return 0, io.EOF
+		}
+		data, err := r.x.take(r.ctx, r.i, xferIdle)
+		if err != nil {
+			return 0, err
+		}
+		r.buf, r.i = data, r.i+1
+	}
+	n := copy(p, r.buf)
+	r.buf = r.buf[n:]
+	return n, nil
+}
+
+type xfers struct {
+	mu sync.Mutex
+	m  map[string]*xfer
+}
+
+func (c *xfers) open(agentID string, size int64) *xfer {
+	x := &xfer{
+		id: randToken()[:24], agentID: agentID, size: -1,
+		changed: make(chan struct{}), chunks: map[int][]byte{},
+		sized: make(chan struct{}), last: time.Now(),
+	}
+	if size >= 0 {
+		x.size, x.n = size, pieces(size)
+		close(x.sized)
+	}
+	c.mu.Lock()
+	if c.m == nil {
+		c.m = map[string]*xfer{}
+	}
+	// Forget the ones left behind: a closed tab, a client gone for good.
+	for id, old := range c.m {
+		old.mu.Lock()
+		stale := time.Since(old.last) > xferIdle
+		old.mu.Unlock()
+		if stale {
+			old.fail("передача брошена")
+			delete(c.m, id)
+		}
+	}
+	c.m[x.id] = x
+	c.mu.Unlock()
+	return x
+}
+
+func (c *xfers) get(id string) *xfer {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.m[id]
+}
+
+// forAgent returns the transfer if it is the asking agent's.
+func (c *xfers) forAgent(id, agentID string) *xfer {
+	if x := c.get(id); x != nil && x.agentID == agentID {
+		return x
+	}
+	return nil
+}
+
+func (c *xfers) drop(id string) {
+	c.mu.Lock()
+	delete(c.m, id)
+	c.mu.Unlock()
+}
+
+// waitTask runs a task on the agent and waits for its result, or for ctx to
+// end.
+func (s *Server) waitTask(ctx context.Context, agentID, typ string, args any, timeout time.Duration) (proto.TaskResult, error) {
+	raw, _ := json.Marshal(args)
+	taskID, ch := s.hub.CreateTask(agentID, typ, raw)
+	defer s.hub.DiscardTask(taskID)
+	t := time.NewTimer(timeout)
+	defer t.Stop()
+	select {
+	case res := <-ch:
+		return res, nil
+	case <-ctx.Done():
+		return proto.TaskResult{}, ctx.Err()
+	case <-t.C:
+		return proto.TaskResult{}, errors.New("таймаут ожидания агента")
+	}
+}
+
+// unknownOp tells an agent that predates the task.
+func unknownOp(res proto.TaskResult) bool {
+	return !res.OK && strings.Contains(res.Error, "неизвестная операция")
+}
+
+// fsAgent answers the request itself and returns false when the agent is
+// unknown or offline.
+func (s *Server) fsAgent(w http.ResponseWriter, agentID string, asJSON bool) bool {
+	a, err := s.db.GetAgent(agentID)
+	if err != nil || a == nil {
+		http.Error(w, "not found", http.StatusNotFound)
+		return false
+	}
+	if !s.online(a) {
+		if asJSON {
+			writeJSON(w, proto.TaskResult{Error: "машина офлайн"})
+		} else {
+			http.Error(w, "машина офлайн", http.StatusServiceUnavailable)
+		}
+		return false
+	}
+	return true
+}
+
+// readPiece reads a piece's body into a buffer of its own size, so pieces
+// leave no trail of grown buffers behind.
+func readPiece(w http.ResponseWriter, r *http.Request) ([]byte, error) {
+	if r.ContentLength >= 0 && r.ContentLength <= xferChunk {
+		data := make([]byte, r.ContentLength)
+		_, err := io.ReadFull(r.Body, data)
+		return data, err
+	}
+	return io.ReadAll(http.MaxBytesReader(w, r.Body, xferChunk))
+}
+
+// ---------- upload: browser -> agent ----------
+
+// POST /api/panel/agents/{id}/fs/upload?path=...&size=N - start writing a
+// file. The answer names the transfer and the piece size; the browser then
+// PUTs the pieces and asks for the result.
+func (s *Server) handleFSUploadStart(w http.ResponseWriter, r *http.Request) {
+	agentID, p := r.PathValue("id"), r.URL.Query().Get("path")
+	if !s.fsAgent(w, agentID, true) {
+		return
+	}
+	size, err := strconv.ParseInt(r.URL.Query().Get("size"), 10, 64)
+	if p == "" || err != nil || size < 0 {
+		writeJSON(w, proto.TaskResult{Error: "не указан путь или размер"})
+		return
+	}
+	if size > proto.FSFileCap {
+		writeJSON(w, proto.TaskResult{Error: "файл больше 512 МБ"})
+		return
+	}
+	x := s.xfers.open(agentID, size)
+	go s.runUpload(x, p)
+	data, _ := json.Marshal(map[string]any{"id": x.id, "chunk": xferChunk})
+	writeJSON(w, proto.TaskResult{OK: true, Data: data})
+}
+
+// runUpload has the agent write the file and keeps the result for the
+// browser to collect.
+func (s *Server) runUpload(x *xfer, p string) {
+	ctx, cancel := context.WithTimeout(context.Background(), xferTimeout)
+	defer cancel()
+	args := proto.FSXferArgs{Path: p, Xfer: x.id, Size: x.size, Chunk: xferChunk}
+	res, err := s.waitTask(ctx, x.agentID, proto.TaskFSPut, args, xferTimeout)
+	if err == nil && unknownOp(res) {
+		res = s.legacyUpload(ctx, x, p)
+	}
+	if err != nil {
+		res = proto.TaskResult{Error: err.Error()}
+	}
+	if !res.OK {
+		x.fail(res.Error)
+	}
+	x.finish(res)
+	// The result waits a while for the browser to come for it.
+	time.AfterFunc(xferIdle, func() { s.xfers.drop(x.id) })
+}
+
+// legacyUpload writes a file through an agent that predates the pieces.
+func (s *Server) legacyUpload(ctx context.Context, x *xfer, p string) proto.TaskResult {
+	if x.size > fsLegacyCap {
+		return proto.TaskResult{Error: "клиент принимает файлы до 32 МБ - обновите его"}
+	}
+	data, err := io.ReadAll(&xferReader{ctx: ctx, x: x})
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	args := proto.FSWriteArgs{Path: p, Data: base64.StdEncoding.EncodeToString(data)}
+	res, err := s.waitTask(ctx, x.agentID, proto.TaskFSWrite, args, fsTaskTimeout)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	return res
+}
+
+// PUT /api/panel/fs/xfer/{xid}/{i} - piece i of a file being uploaded. 503:
+// no room yet, send it again; 410: the transfer is over.
+func (s *Server) handleXferPut(w http.ResponseWriter, r *http.Request) {
+	x := s.xfers.get(r.PathValue("xid"))
+	i, err := strconv.Atoi(r.PathValue("i"))
+	if x == nil || err != nil {
+		http.Error(w, "передача не найдена", http.StatusGone)
+		return
+	}
+	data, err := readPiece(w, r)
+	if err != nil {
+		http.Error(w, "кусок не дошёл", http.StatusBadRequest)
+		return
+	}
+	code, msg := x.put(r.Context(), i, data)
+	if code == http.StatusNoContent {
+		w.WriteHeader(code)
+		return
+	}
+	http.Error(w, msg, code)
+}
+
+// POST /api/panel/fs/xfer/{xid}/cancel - the browser gives the upload up.
+func (s *Server) handleXferCancel(w http.ResponseWriter, r *http.Request) {
+	if x := s.xfers.get(r.PathValue("xid")); x != nil {
+		x.fail("отменено")
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// GET /api/panel/fs/xfer/{xid}/result - the upload's result, once the agent
+// has written the file; {"done":false} means ask again.
+func (s *Server) handleXferResult(w http.ResponseWriter, r *http.Request) {
+	x := s.xfers.get(r.PathValue("xid"))
+	if x == nil {
+		writeJSON(w, map[string]any{"done": true, "result": proto.TaskResult{Error: "передача не найдена"}})
+		return
+	}
+	if !x.await(r.Context(), xferWait, func() bool { return x.done }) {
+		writeJSON(w, map[string]any{"done": false})
+		return
+	}
+	res := x.result
+	x.mu.Unlock()
+	writeJSON(w, map[string]any{"done": true, "result": res})
+}
+
+// GET /api/agent/fs/xfer/{xid}/{i}?ack=K - piece i of the upload, for the
+// agent to write. K says the agent has written every piece below it, so
+// those are let go. 503: not here yet, ask again; 410: the transfer is over.
+func (s *Server) handleAgentXferGet(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	x := s.xfers.forAgent(r.PathValue("xid"), a.ID)
+	i, err := strconv.Atoi(r.PathValue("i"))
+	if x == nil || err != nil {
+		http.Error(w, "передача не найдена", http.StatusGone)
+		return
+	}
+	if ack, err := strconv.Atoi(r.URL.Query().Get("ack")); err == nil {
+		x.mu.Lock()
+		if ack > x.low {
+			for k := x.low; k < ack; k++ {
+				delete(x.chunks, k)
+			}
+			x.low = ack
+			x.notify()
+		}
+		x.mu.Unlock()
+	}
+	if !x.await(r.Context(), xferWait, func() bool { return x.err != "" || x.chunks[i] != nil }) {
+		http.Error(w, "кусок ещё не пришёл", http.StatusServiceUnavailable)
+		return
+	}
+	if x.err != "" {
+		msg := x.err
+		x.mu.Unlock()
+		http.Error(w, msg, http.StatusGone)
+		return
+	}
+	data := x.chunks[i]
+	x.mu.Unlock()
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("Content-Length", strconv.Itoa(len(data)))
+	_, _ = w.Write(data)
+}
+
+// ---------- download: agent -> browser ----------
+
+// inlineTypes are the files the panel shows in place rather than downloads.
+var inlineTypes = map[string]string{
+	".png": "image/png", ".jpg": "image/jpeg", ".jpeg": "image/jpeg", ".gif": "image/gif",
+	".webp": "image/webp", ".bmp": "image/bmp", ".ico": "image/x-icon", ".avif": "image/avif",
+	".svg": "image/svg+xml",
+	".mp4": "video/mp4", ".m4v": "video/mp4", ".webm": "video/webm", ".ogv": "video/ogg", ".mov": "video/quicktime",
+	".mp3": "audio/mpeg", ".wav": "audio/wav", ".ogg": "audio/ogg", ".oga": "audio/ogg", ".m4a": "audio/mp4",
+	".aac": "audio/aac", ".flac": "audio/flac", ".opus": "audio/ogg",
+	".pdf": "application/pdf",
+}
+
+// fileHeaders sets what the browser needs to download or show the file. A
+// file shown in place runs nothing: no scripts in an SVG, whatever it holds.
+// A PDF is the exception, as the browser's viewer will not open in a sandbox;
+// it runs in that viewer, not in the panel's page.
+func fileHeaders(w http.ResponseWriter, p string, inline bool) {
+	name := path.Base(p)
+	ctype := "application/octet-stream"
+	if t, ok := inlineTypes[strings.ToLower(path.Ext(name))]; ok && inline {
+		ctype = t
+	}
+	disp := "attachment"
+	if inline {
+		disp = "inline"
+	}
+	w.Header().Set("Content-Type", ctype)
+	w.Header().Set("Content-Disposition", disp+"; filename=\""+strings.ReplaceAll(name, "\"", "")+"\"")
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	if ctype != "application/pdf" {
+		w.Header().Set("Content-Security-Policy", "sandbox; default-src 'none'; img-src data:; style-src 'unsafe-inline'")
+	}
+	w.Header().Set("Cache-Control", "no-store")
+}
+
+// GET /api/panel/agents/{id}/fs/download?path=...[&inline=1] - the file, as
+// one response fed by the pieces the agent sends. inline=1 serves pictures,
+// video and sound for the page to show.
+func (s *Server) handleFSDownload(w http.ResponseWriter, r *http.Request) {
+	agentID, p := r.PathValue("id"), r.URL.Query().Get("path")
+	inline := r.URL.Query().Get("inline") != ""
+	if !s.fsAgent(w, agentID, false) {
+		return
+	}
+	x := s.xfers.open(agentID, -1)
+	defer s.xfers.drop(x.id)
+	defer x.fail("браузер ушёл") // stops the agent if the response ends early
+
+	raw, _ := json.Marshal(proto.FSXferArgs{Path: p, Xfer: x.id, Size: -1, Chunk: xferChunk})
+	taskID, ch := s.hub.CreateTask(agentID, proto.TaskFSSend, raw)
+	defer s.hub.DiscardTask(taskID)
+	// The agent's result: an error ends the transfer wherever it stands.
+	results := make(chan proto.TaskResult, 1)
+	go func() {
+		select {
+		case res := <-ch:
+			if !res.OK && !unknownOp(res) {
+				x.fail(res.Error)
+			}
+			results <- res
+		case <-r.Context().Done():
+		}
+	}()
+
+	select {
+	case <-x.sized:
+	case res := <-results:
+		if unknownOp(res) {
+			s.legacyDownload(w, r, agentID, p, inline)
+			return
+		}
+		msg := res.Error
+		if msg == "" {
+			msg = "агент не отдал файл"
+		}
+		http.Error(w, msg, http.StatusBadGateway)
+		return
+	case <-r.Context().Done():
+		return
+	case <-time.After(fsTaskTimeout):
+		http.Error(w, "таймаут ожидания агента", http.StatusGatewayTimeout)
+		return
+	}
+
+	fileHeaders(w, p, inline)
+	w.Header().Set("Content-Length", strconv.FormatInt(x.size, 10))
+	rc := http.NewResponseController(w)
+	for i := 0; i < x.n; i++ {
+		data, err := x.take(r.Context(), i, xferIdle)
+		if err == nil {
+			_, err = w.Write(data)
+		}
+		if err != nil {
+			// Cut the response off, so the browser does not take a part of
+			// the file for all of it.
+			x.fail(err.Error())
+			panic(http.ErrAbortHandler)
+		}
+		_ = rc.Flush()
+	}
+}
+
+// legacyDownload gets a file from an agent that predates the pieces.
+func (s *Server) legacyDownload(w http.ResponseWriter, r *http.Request, agentID, p string, inline bool) {
+	res, err := s.waitTask(r.Context(), agentID, proto.TaskFSDownload, proto.FSPathArgs{Path: p}, fsTaskTimeout)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusGatewayTimeout)
+		return
+	}
+	if !res.OK {
+		http.Error(w, res.Error, http.StatusBadGateway)
+		return
+	}
+	var rr proto.FSReadResult
+	if err := json.Unmarshal(res.Data, &rr); err != nil {
+		http.Error(w, "bad result", http.StatusBadGateway)
+		return
+	}
+	data, _ := base64.StdEncoding.DecodeString(rr.Content)
+	fileHeaders(w, p, inline)
+	if rr.Truncated {
+		w.Header().Set("X-Truncated", "1")
+	}
+	_, _ = w.Write(data)
+}
+
+// POST /api/agent/fs/xfer/{xid}/{i} - piece i of the file the browser asked
+// for, X-Size its whole size. 503: no room yet, send it again; 410: the
+// browser is gone.
+func (s *Server) handleAgentXferPost(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	x := s.xfers.forAgent(r.PathValue("xid"), a.ID)
+	i, err := strconv.Atoi(r.PathValue("i"))
+	if x == nil || err != nil {
+		http.Error(w, "передача не найдена", http.StatusGone)
+		return
+	}
+	size, err := strconv.ParseInt(r.Header.Get("X-Size"), 10, 64)
+	if err != nil || size < 0 || size > proto.FSFileCap || !x.setSize(size) {
+		http.Error(w, "не тот размер", http.StatusBadRequest)
+		return
+	}
+	data, err := readPiece(w, r)
+	if err != nil {
+		http.Error(w, "кусок не дошёл", http.StatusBadRequest)
+		return
+	}
+	code, msg := x.put(r.Context(), i, data)
+	if code == http.StatusNoContent {
+		w.WriteHeader(code)
+		return
+	}
+	http.Error(w, msg, code)
+}

internal/server/handlers_agent.go

@@ -45,6 +45,7 @@ func (s *Server) handlePoll(w http.ResponseWriter, r *http.Request) {
 	}
 	// The agent sends its version and OS user occasionally; record them when
 	// present. Agents older than 0.0.2 send no user, so keep what we have.
+	s.viaDirectA.Store(a.ID, s.viaDirect(r))
 	v := r.Header.Get("X-Agent-Version")
 	u := firstNonEmpty(r.Header.Get("X-Agent-User"), a.RunUser)
 	if v != "" && (v != a.Version || u != a.RunUser) {
@@ -53,8 +54,9 @@ func (s *Server) handlePoll(w http.ResponseWriter, r *http.Request) {
 		_ = s.db.TouchAgent(a.ID)
 	}
 	msg := s.hub.WaitControl(r.Context().Done(), a.ID, pollHold)
-	// Set after the hold so a port changed meanwhile reaches the agent now.
+	// Set after the hold so a setting changed meanwhile reaches the agent now.
 	s.setTunnelHeader(w)
+	w.Header().Set(proto.TransportHeader, s.transportOf(a.ID))
 	writeJSON(w, msg)
 }
 
@@ -66,16 +68,22 @@ func (s *Server) setTunnelHeader(w http.ResponseWriter) {
 	if addr := s.tunnelAdvert(); addr != "" {
 		w.Header().Set(tunnelAddrHeader, addr)
 	}
+	if d := s.db.DirectAddress(); d != "" {
+		w.Header().Set(proto.FallbackHeader, d)
+		w.Header().Set(proto.MainHeader, s.db.HostAddress())
+	}
 }
 
 // GET /api/agent/config - settings an agent picks up when it connects, without
 // waiting out a poll hold.
 func (s *Server) handleAgentConfig(w http.ResponseWriter, r *http.Request) {
-	if s.authenticateAgent(r) == nil {
+	a := s.authenticateAgent(r)
+	if a == nil {
 		http.Error(w, "unauthorized", http.StatusUnauthorized)
 		return
 	}
 	s.setTunnelHeader(w)
+	w.Header().Set(proto.TransportHeader, s.transportOf(a.ID))
 	w.WriteHeader(http.StatusNoContent)
 }
 

internal/server/handlers_panel.go

@@ -11,6 +11,7 @@ import (
 	"slices"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/x-grk/longpolling-remote-access/internal/proto"
@@ -87,7 +88,12 @@ func (s *Server) handleLoginSubmit(w http.ResponseWriter, r *http.Request) {
 	admin, _ := s.db.AdminByUsername(username)
 	if admin == nil || !checkPassword(admin.PassHash, pw) {
 		s.limiter.fin(ip, false)
-		s.render(w, "login.html", map[string]any{"Error": "Неверный логин или пароль."})
+		s.render(w, "login.html", map[string]any{"Error": "Неверный логин или пароль.", "Username": username})
+		return
+	}
+	// An admin who turned the password off signs in with a passkey only.
+	if s.db.PasswordOff(admin.ID) {
+		s.render(w, "login.html", map[string]any{"Error": "Для этого аккаунта вход только по ключу доступа.", "Username": username})
 		return
 	}
 	s.limiter.fin(ip, true)
@@ -116,13 +122,18 @@ func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
 		Online bool
 		Seen   string
 	}
+	me := s.currentAdmin(r)
 	rows := make([]row, 0, len(agents))
 	for _, a := range agents {
+		if !s.db.CanUseAgent(me, a.ID) {
+			continue
+		}
 		on := s.online(&a)
 		rows = append(rows, row{Agent: a, Online: on, Seen: seenText(on, a.LastSeen)})
 	}
 	s.render(w, "dashboard.html", map[string]any{
-		"Admin":  s.currentAdmin(r),
+		"Admin":   me,
+		"IsAdmin": me.IsAdmin(),
 		"Agents":  rows,
 		"CSRF":    csrfToken(r),
 	})
@@ -147,13 +158,20 @@ func (s *Server) handlePresence(w http.ResponseWriter, r *http.Request) {
 	}
 	type item struct {
 		ID       string `json:"id"`
+		Name     string `json:"name"`
+		Hostname string `json:"hostname"`
+		User     string `json:"user"` // who a terminal opens as
 		Online   bool   `json:"online"`
 		Seen     string `json:"seen"`
 	}
+	me := s.currentAdmin(r)
 	out := make([]item, 0, len(agents))
 	for _, a := range agents {
+		if !s.db.CanUseAgent(me, a.ID) {
+			continue
+		}
 		on := s.online(&a)
-		out = append(out, item{ID: a.ID, Online: on, Seen: seenText(on, a.LastSeen)})
+		out = append(out, item{ID: a.ID, Name: a.Name, Hostname: a.Hostname, User: a.TerminalUser(), Online: on, Seen: seenText(on, a.LastSeen)})
 	}
 	writeJSON(w, out)
 }
@@ -199,12 +217,19 @@ func (s *Server) handleAgentEdit(w http.ResponseWriter, r *http.Request) {
 	}
 	data := map[string]any{
 		"Agent":         a,
+		"IsAdmin":       s.currentAdmin(r).IsAdmin(),
 		"CSRF":          csrfToken(r),
 		"ServerVersion": Version,
 		"Outdated":      a.Version != "" && a.Version != Version,
 		"Updated":       r.URL.Query().Get("updated") == "1",
+		"UpdateMsg":     r.URL.Query().Get("umsg"),
+		"UpdateErr":     r.URL.Query().Get("uperr"),
 		"UserOK":        r.URL.Query().Get("uok"),
 		"UserErr":       r.URL.Query().Get("uerr"),
+		"Transport":     firstNonEmpty(a.Transport, proto.TransportAuto),
+		"OnWS":          s.wsAgents.On(a.ID),
+		"ViaDirect":     viaDirectOf(&s.viaDirectA, a.ID),
+		"Online":        s.online(a),
 	}
 	// The user list lives on the machine, so it is only known while it is online.
 	if s.online(a) {
@@ -217,6 +242,21 @@ func (s *Server) handleAgentEdit(w http.ResponseWriter, r *http.Request) {
 	s.render(w, "edit.html", data)
 }
 
+// POST /agents/{id}/transport - how the agent is to reach the server: auto,
+// ws or lp. A connected agent picks it up within a poll round.
+func (s *Server) handleAgentTransport(w http.ResponseWriter, r *http.Request) {
+	if !checkCSRF(r) {
+		http.Error(w, "bad csrf", http.StatusForbidden)
+		return
+	}
+	id, t := r.PathValue("id"), r.FormValue("transport")
+	switch t {
+	case proto.TransportAuto, proto.TransportWS, proto.TransportLP:
+		_ = s.db.SetAgentTransport(id, t)
+	}
+	http.Redirect(w, r, "/agents/"+id+"/edit", http.StatusSeeOther)
+}
+
 // usersTaskTimeout bounds how long the edit page waits for the agent.
 const usersTaskTimeout = 8 * time.Second
 
@@ -340,17 +380,28 @@ func (s *Server) handleAgentUpdate(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
+	back := func(q url.Values) { http.Redirect(w, r, "/agents/"+id+"/edit?"+q.Encode(), http.StatusSeeOther) }
 	if !s.online(a) {
-		http.Redirect(w, r, "/agents/"+id+"/edit?updated=0", http.StatusSeeOther)
+		back(url.Values{"uperr": {"машина не в сети"}})
 		return
 	}
-	taskID, ch := s.hub.CreateTask(id, proto.TaskSysUpdate, nil)
+	if admin := s.currentAdmin(r); admin != nil {
-	defer s.hub.DiscardTask(taskID)
+		s.db.Audit(admin.ID, id, "update:"+a.Version+" -> "+Version)
-	select {
+	}
-	case <-ch:
+	// The download can take a while on a slow link; under a proxy's timeout.
-	case <-time.After(30 * time.Second):
+	res, err := s.waitTask(r.Context(), id, proto.TaskSysUpdate, nil, 80*time.Second)
+	switch {
+	case err != nil:
+		back(url.Values{"uperr": {"агент не ответил: " + err.Error()}})
+	case !res.OK:
+		back(url.Values{"uperr": {res.Error}})
+	default:
+		var d struct {
+			Status string `json:"status"`
+		}
+		_ = json.Unmarshal(res.Data, &d)
+		back(url.Values{"updated": {"1"}, "umsg": {d.Status}})
 	}
-	http.Redirect(w, r, "/agents/"+id+"/edit?updated=1", http.StatusSeeOther)
 }
 
 func (s *Server) handleAgentRename(w http.ResponseWriter, r *http.Request) {
@@ -370,7 +421,15 @@ func (s *Server) handleAgentRename(w http.ResponseWriter, r *http.Request) {
 
 func (s *Server) handleSettings(w http.ResponseWriter, r *http.Request) {
 	admins, _ := s.db.ListAdmins()
+	keyCounts, passOff, agentCounts := map[int64]int{}, map[int64]bool{}, map[int64]int{}
+	for _, a := range admins {
+		keyCounts[a.ID] = s.db.CountAdminKeys(a.ID)
+		passOff[a.ID] = s.db.PasswordOff(a.ID)
+		agentCounts[a.ID] = len(s.db.UserAgents(a.ID))
+	}
+	allAgents, _ := s.db.ListAgents()
 	host := s.db.HostAddress()
+	direct := s.db.DirectAddress()
 	secret := s.db.EnrollSecret()
 	code := s.db.InstallCode()
 	ufwInstalled, ufwActive, ufwRunnable := s.ufw.status()
@@ -378,8 +437,17 @@ func (s *Server) handleSettings(w http.ResponseWriter, r *http.Request) {
 	s.render(w, "settings.html", map[string]any{
 		"Admin":         s.currentAdmin(r),
 		"Host":          host,
+		"Direct":        direct,
+		"DirectShort":   fmt.Sprintf("wget -qO- %s/i/%s | sudo sh", direct, code),
+		"DirectCurl":    fmt.Sprintf("curl -fsSL %s/install.sh | sudo HOST=%s FALLBACK_HOST=%s ENROLL_SECRET=%s sh", direct, direct, host, secret),
 		"Secret":        secret,
+		"CodeLen":       s.db.InstallCodeLen(),
 		"Admins":        admins,
+		"KeyCounts":     keyCounts,
+		"AgentCounts":   agentCounts,
+		"AllAgents":     allAgents,
+		"Me":            s.currentAdmin(r),
+		"PassOff":       passOff,
 		"CSRF":          csrfToken(r),
 		"InstallShort":  fmt.Sprintf("wget -qO- %s/i/%s | sudo sh", host, code),
 		"InstallCurl":   fmt.Sprintf("curl -fsSL %s/install.sh | sudo HOST=%s ENROLL_SECRET=%s sh", host, host, secret),
@@ -397,6 +465,7 @@ func (s *Server) handleSettings(w http.ResponseWriter, r *http.Request) {
 		"TunnelCustom":  s.db.TunnelPort() > 0,
 		"Error": map[string]string{
 			"tunnel_host":   "Некорректный хост туннеля: нужен IP или имя без схемы и порта.",
+			"host":          "Некорректный адрес: нужен URL вида https://panel.example.com, без пути.",
 			"tunnel_port":   "Некорректный порт туннеля.",
 			"ufw_port":      "Некорректное правило ufw: нужен порт 1-65535 и протокол tcp или udp.",
 			"ufw_off":       "Правило ufw не добавлено: ufw выключен или интеграция с ним отключена.",
@@ -470,9 +539,20 @@ func (s *Server) handleSetHost(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	host := strings.TrimRight(strings.TrimSpace(r.FormValue("host")), "/")
+	direct := strings.TrimRight(strings.TrimSpace(r.FormValue("direct")), "/")
+	for _, v := range []string{host, direct} {
+		if v == "" {
+			continue
+		}
+		if u, err := url.Parse(v); err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" || (u.Path != "" && u.Path != "/") {
+			http.Redirect(w, r, "/settings?err=host", http.StatusSeeOther)
+			return
+		}
+	}
 	if host != "" {
 		_ = s.db.SetConfig(cfgHostAddress, host)
 	}
+	_ = s.db.SetConfig(cfgDirectAddr, direct)
 	http.Redirect(w, r, "/settings", http.StatusSeeOther)
 }
 
@@ -483,7 +563,22 @@ func (s *Server) handleRotateSecret(w http.ResponseWriter, r *http.Request) {
 	}
 	_ = s.db.SetConfig(cfgEnrollSecret, randToken())
 	// Rotate the short install code too so old /i/<code> links stop working.
-	_ = s.db.SetConfig(cfgInstallCode, shortCode())
+	_ = s.db.SetConfig(cfgInstallCode, shortCode(s.db.InstallCodeLen()))
+	http.Redirect(w, r, "/settings", http.StatusSeeOther)
+}
+
+// POST /settings/install/code - a new install code, of the length given:
+// the old /i/<code> link stops working.
+func (s *Server) handleInstallCode(w http.ResponseWriter, r *http.Request) {
+	if !checkCSRF(r) {
+		http.Error(w, "bad csrf", http.StatusForbidden)
+		return
+	}
+	if n, err := strconv.Atoi(r.FormValue("len")); err == nil {
+		n = min(installCodeMax, max(installCodeMin, n))
+		_ = s.db.SetConfig(cfgInstallLen, strconv.Itoa(n))
+	}
+	_ = s.db.SetConfig(cfgInstallCode, shortCode(s.db.InstallCodeLen()))
 	http.Redirect(w, r, "/settings", http.StatusSeeOther)
 }
 
@@ -494,12 +589,21 @@ func (s *Server) handleAddAdmin(w http.ResponseWriter, r *http.Request) {
 	}
 	username := strings.TrimSpace(r.FormValue("username"))
 	pw := r.FormValue("password")
+	role := RoleAdmin
+	if r.FormValue("role") == RoleUser {
+		role = RoleUser
+	}
 	if username != "" && len(pw) >= 8 {
 		if hash, err := hashPassword(pw); err == nil {
-			_ = s.db.CreateAdmin(username, hash)
+			if id, err := s.db.CreateUser(username, hash, role); err == nil && role == RoleUser {
+				_ = s.db.SetUserAgents(id, r.Form["agents"])
+			}
+			if me := s.currentAdmin(r); me != nil {
+				s.db.Audit(me.ID, "", "user_add:"+username+":"+role)
 			}
 		}
-	http.Redirect(w, r, "/settings", http.StatusSeeOther)
+	}
+	http.Redirect(w, r, "/settings#users", http.StatusSeeOther)
 }
 
 func (s *Server) handleDeleteAdmin(w http.ResponseWriter, r *http.Request) {
@@ -509,7 +613,7 @@ func (s *Server) handleDeleteAdmin(w http.ResponseWriter, r *http.Request) {
 	}
 	id, _ := strconv.ParseInt(r.FormValue("id"), 10, 64)
 	// Never delete the last admin.
-	if n, _ := s.db.CountAdmins(); n > 1 {
+	if u, _ := s.db.AdminByID(id); u != nil && (!u.IsAdmin() || s.db.CountRole(RoleAdmin) > 1) {
 		_ = s.db.DeleteAdmin(id)
 	}
 	http.Redirect(w, r, "/settings", http.StatusSeeOther)
@@ -562,7 +666,7 @@ func (s *Server) handleUfwRevoke(w http.ResponseWriter, r *http.Request) {
 // handleInstallScript serves the generic installer; the secret is NOT baked in,
 // so it must be supplied via env or the interactive prompt.
 func (s *Server) handleInstallScript(w http.ResponseWriter, r *http.Request) {
-	s.renderInstall(w, "")
+	s.renderInstall(w, r, "")
 }
 
 // handleShortInstall serves the installer behind the short /i/<code> link with
@@ -570,20 +674,48 @@ func (s *Server) handleInstallScript(w http.ResponseWriter, r *http.Request) {
 //
 //	wget -qO- https://host/i/<code> | sudo sh
 func (s *Server) handleShortInstall(w http.ResponseWriter, r *http.Request) {
+	// A short code can be guessed: wrong ones count against the address
+	// like wrong passwords do.
+	ip := clientIP(r)
+	if s.limiter.blocked(ip) {
+		http.Error(w, "too many attempts", http.StatusTooManyRequests)
+		return
+	}
 	code := r.PathValue("code")
 	want := s.db.InstallCode()
 	if want == "" || !constantTimeEqual(code, want) {
+		s.limiter.fin(ip, false)
 		http.NotFound(w, r)
 		return
 	}
-	s.renderInstall(w, s.db.EnrollSecret())
+	s.renderInstall(w, r, s.db.EnrollSecret())
 }
 
-// renderInstall writes install.sh with the current host and an optional secret.
+// viaDirect reports whether the request came to the direct address.
-func (s *Server) renderInstall(w http.ResponseWriter, secret string) {
+func (s *Server) viaDirect(r *http.Request) bool {
+	d := directHost(s.db.DirectAddress())
+	if d == "" {
+		return false
+	}
+	host := r.Host
+	if h, _, err := net.SplitHostPort(host); err == nil {
+		host = h
+	}
+	return strings.EqualFold(host, d)
+}
+
+// renderInstall writes install.sh with the server's addresses and an
+// optional secret. Fetched from the direct address, it makes that the
+// agent's address and the main one its fallback; otherwise the other way.
+func (s *Server) renderInstall(w http.ResponseWriter, r *http.Request, secret string) {
+	host, fallback := s.db.HostAddress(), s.db.DirectAddress()
+	if s.viaDirect(r) {
+		host, fallback = fallback, host
+	}
 	w.Header().Set("Content-Type", "text/x-shellscript; charset=utf-8")
 	if err := s.installTmpl.Execute(w, map[string]any{
-		"Host":   s.db.HostAddress(),
+		"Host":     host,
+		"Fallback": fallback,
 		"Secret":   secret,
 	}); err != nil {
 		log.Printf("install.sh render: %v", err)
@@ -596,3 +728,11 @@ func (s *Server) downloadHandler() http.Handler {
 	// install one-liner works before the machine is enrolled.
 	return http.FileServer(http.Dir(s.distDir))
 }
+
+// viaDirectOf tells whether the agent last reached the server at the direct
+// address.
+func viaDirectOf(m *sync.Map, id string) bool {
+	v, _ := m.Load(id)
+	b, _ := v.(bool)
+	return b
+}

internal/server/handlers_panel_fs.go

@@ -1,11 +1,9 @@
 package server
 
 import (
-	"encoding/base64"
 	"encoding/json"
 	"io"
 	"net/http"
-	"path"
 	"time"
 
 	"github.com/x-grk/longpolling-remote-access/internal/proto"
@@ -22,6 +20,15 @@ var fsOps = map[string]string{
 	"unzip":     proto.TaskFSUnzip,
 	"zip":       proto.TaskFSZip,
 	"move":      proto.TaskFSMove,
+	"stat":      proto.TaskFSStat,
+	"chmod":     proto.TaskFSChmod,
+	"copy":      proto.TaskFSCopy,
+	"db.tables": proto.TaskDBTables,
+	"db.rows":   proto.TaskDBRows,
+	"db.set":    proto.TaskDBSet,
+	"db.add":    proto.TaskDBAdd,
+	"db.del":    proto.TaskDBDel,
+	"db.sql":    proto.TaskDBSQL,
 }
 
 // fsTaskTimeout bounds how long we wait for an agent to answer a file op.
@@ -63,6 +70,26 @@ func (s *Server) handleFSOp(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Changes to a database go to the audit log, with what was done.
+	if op == "db.set" || op == "db.add" || op == "db.del" || op == "db.sql" {
+		var d struct {
+			Path, Table, Column, SQL string
+		}
+		_ = json.Unmarshal(args, &d)
+		what := d.Path + " " + d.Table
+		if d.Column != "" {
+			what += "." + d.Column
+		}
+		if d.SQL != "" {
+			what += " " + d.SQL
+		}
+		if len(what) > 300 {
+			what = what[:300]
+		}
+		if admin := s.currentAdmin(r); admin != nil {
+			s.db.Audit(admin.ID, agentID, op+":"+what)
+		}
+	}
 	taskID, resultCh := s.hub.CreateTask(agentID, taskType, args)
 	defer s.hub.DiscardTask(taskID)
 
@@ -73,44 +100,3 @@ func (s *Server) handleFSOp(w http.ResponseWriter, r *http.Request) {
 		writeJSON(w, proto.TaskResult{Error: "таймаут ожидания агента"})
 	}
 }
-
-// GET /api/panel/agents/{id}/fs/download?path=... - stream a file as a download.
-func (s *Server) handleFSDownload(w http.ResponseWriter, r *http.Request) {
-	agentID := r.PathValue("id")
-	p := r.URL.Query().Get("path")
-	a, err := s.db.GetAgent(agentID)
-	if err != nil || a == nil {
-		http.NotFound(w, r)
-		return
-	}
-	if !s.online(a) {
-		http.Error(w, "машина офлайн", http.StatusServiceUnavailable)
-		return
-	}
-	args, _ := json.Marshal(proto.FSPathArgs{Path: p})
-	taskID, ch := s.hub.CreateTask(agentID, proto.TaskFSDownload, args)
-	defer s.hub.DiscardTask(taskID)
-
-	select {
-	case res := <-ch:
-		if !res.OK {
-			http.Error(w, res.Error, http.StatusBadGateway)
-			return
-		}
-		var rr proto.FSReadResult
-		if err := json.Unmarshal(res.Data, &rr); err != nil {
-			http.Error(w, "bad result", http.StatusBadGateway)
-			return
-		}
-		data, _ := base64.StdEncoding.DecodeString(rr.Content)
-		name := path.Base(p)
-		w.Header().Set("Content-Type", "application/octet-stream")
-		w.Header().Set("Content-Disposition", "attachment; filename=\""+name+"\"")
-		if rr.Truncated {
-			w.Header().Set("X-Truncated", "1")
-		}
-		_, _ = w.Write(data)
-	case <-time.After(fsTaskTimeout):
-		http.Error(w, "таймаут ожидания агента", http.StatusGatewayTimeout)
-	}
-}

internal/server/handlers_panel_fwd.go

@@ -114,6 +114,10 @@ func (s *Server) handleForwardDelete(w http.ResponseWriter, r *http.Request) {
 	}
 	rid, _ := strconv.ParseInt(r.PathValue("rid"), 10, 64)
 	rule, _ := s.db.GetForwardRule(rid)
+	if rule == nil || !s.db.CanUseAgent(s.currentAdmin(r), rule.AgentID) {
+		http.NotFound(w, r)
+		return
+	}
 	s.removeForward(rid)
 	dest := "/"
 	if rule != nil {

internal/server/handlers_panel_term.go

@@ -1,9 +1,18 @@
 package server
 
 import (
+	"context"
 	"encoding/json"
+	"io"
 	"log"
+	"net"
 	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/coder/websocket"
+	"github.com/coder/websocket/wsjson"
 
 	"github.com/x-grk/longpolling-remote-access/internal/proto"
 )
@@ -12,7 +21,9 @@ import (
 // same transport the agent uses), so it works through any reverse proxy without
 // WebSocket upgrade support.
 
-// POST /api/panel/term/{agentID}/open - create a terminal session.
+// POST /api/panel/term/{agentID}/open - create a terminal session: a shell
+// on the agent, or with {"ssh": {...}} in the body a shell the agent opens
+// by SSH on another host.
 func (s *Server) handlePanelOpen(w http.ResponseWriter, r *http.Request) {
 	agentID := r.PathValue("agentID")
 	agent, err := s.db.GetAgent(agentID)
@@ -21,6 +32,33 @@ func (s *Server) handlePanelOpen(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
+	var body struct {
+		SSH *proto.SSHTarget `json:"ssh"`
+	}
+	if r.ContentLength != 0 {
+		if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&body); err != nil && err != io.EOF {
+			http.Error(w, "bad request", http.StatusBadRequest)
+			return
+		}
+	}
+	if t := body.SSH; t != nil {
+		t.Host, t.User = strings.TrimSpace(t.Host), strings.TrimSpace(t.User)
+		if t.Port == 0 {
+			t.Port = 22
+		}
+		if t.Host == "" || t.User == "" || t.Port < 1 || t.Port > 65535 || strings.ContainsAny(t.Host+t.User, " \t\r\n/") {
+			w.Header().Set("Content-Type", "application/json")
+			w.WriteHeader(http.StatusBadRequest)
+			_ = json.NewEncoder(w).Encode(map[string]string{"error": "нужны хост, порт 1-65535 и пользователь"})
+			return
+		}
+		sess := s.hub.CreateSSH(agentID, *t)
+		if admin := s.currentAdmin(r); admin != nil {
+			s.db.Audit(admin.ID, agentID, "open_ssh:"+t.User+"@"+net.JoinHostPort(t.Host, strconv.Itoa(t.Port)))
+		}
+		writeJSON(w, map[string]string{"session_id": sess.ID})
+		return
+	}
 	sess := s.hub.CreateSession(agentID, agent.LoginUser)
 	if admin := s.currentAdmin(r); admin != nil {
 		s.db.Audit(admin.ID, agentID, "open_terminal:"+agent.TerminalUser())
@@ -49,6 +87,9 @@ type panelInMsg struct {
 	D    string `json:"d,omitempty"`
 	Cols uint16 `json:"cols,omitempty"`
 	Rows uint16 `json:"rows,omitempty"`
+	// Seq numbers the messages of a session from 1; 0 from a page that
+	// predates it.
+	Seq uint64 `json:"seq,omitempty"`
 }
 
 // POST /api/panel/term/{sid}/in - send keystrokes/resize to the agent PTY.
@@ -63,13 +104,86 @@ func (s *Server) handlePanelIn(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "bad request", http.StatusBadRequest)
 		return
 	}
+	takePanelIn(sess, m)
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// takePanelIn passes the browser's keystrokes or resize on to the agent; a
+// repeat of one already taken is dropped.
+func takePanelIn(sess *Session, m panelInMsg) {
+	if m.Seq > 0 && !sess.TakeSeq(m.Seq) {
+		return
+	}
 	switch m.T {
 	case "i":
 		sess.PushIn(proto.InFrame{Type: proto.FrameStdin, Data: m.D})
 	case "r":
 		sess.PushIn(proto.InFrame{Type: proto.FrameResize, Cols: m.Cols, Rows: m.Rows})
 	}
-	w.WriteHeader(http.StatusNoContent)
+}
+
+// GET /api/panel/term/{sid}/ws - the browser's terminal on a WebSocket: what
+// the "in" requests send comes as messages, and output goes out as soon as
+// it is there, in the "out" answers' shape. The page falls back to those
+// requests when this does not connect.
+func (s *Server) handlePanelTermWS(w http.ResponseWriter, r *http.Request) {
+	sess := s.hub.Session(r.PathValue("sid"))
+	if sess == nil {
+		http.Error(w, "closed", http.StatusGone)
+		return
+	}
+	conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{CompressionMode: websocket.CompressionDisabled})
+	if err != nil {
+		return
+	}
+	conn.SetReadLimit(1 << 20)
+	defer conn.CloseNow()
+	ctx, cancel := context.WithCancel(r.Context())
+	defer cancel()
+	go func() {
+		defer cancel()
+		for ctx.Err() == nil {
+			msgs, alive := sess.PollOutUntil(ctx.Done(), pollHold)
+			if ctx.Err() != nil {
+				return
+			}
+			out := map[string]any{"frames": msgs}
+			if !alive {
+				out = map[string]any{"closed": true}
+			}
+			wctx, wcancel := context.WithTimeout(ctx, 30*time.Second)
+			err := wsjson.Write(wctx, conn, out)
+			wcancel()
+			if err != nil || !alive {
+				return
+			}
+		}
+	}()
+	go func() {
+		t := time.NewTicker(wsPing)
+		defer t.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				pctx, pcancel := context.WithTimeout(ctx, 15*time.Second)
+				err := conn.Ping(pctx)
+				pcancel()
+				if err != nil {
+					cancel()
+					return
+				}
+			}
+		}
+	}()
+	for {
+		var m panelInMsg
+		if err := wsjson.Read(ctx, conn, &m); err != nil {
+			return
+		}
+		takePanelIn(sess, m)
+	}
 }
 
 // POST /api/panel/term/{sid}/close - tear the session down.

internal/server/hub.go

@@ -45,6 +45,7 @@ type Session struct {
 	mu       sync.Mutex
 	inBuf    []proto.InFrame
 	inSignal chan struct{} // size-1; pulsed when inBuf gains data
+	inSeq    uint64        // number of the last browser message taken
 
 	out chan proto.OutMessage // agent -> panel
 
@@ -99,6 +100,13 @@ func (h *Hub) CreateSession(agentID, user string) *Session {
 	return s
 }
 
+// CreateSSH registers a terminal session the agent opens by SSH to t.
+func (h *Hub) CreateSSH(agentID string, t proto.SSHTarget) *Session {
+	s := h.newSession(agentID)
+	h.enqueueJob(agentID, proto.ControlMessage{Type: proto.CtrlOpenSSH, SessionID: s.ID, SSH: &t})
+	return s
+}
+
 // CreateForward registers a port-forward stream (agent dials 127.0.0.1:port).
 func (h *Hub) CreateForward(agentID string, port int) *Session {
 	s := h.newSession(agentID)
@@ -250,6 +258,19 @@ func (s *Session) close() { s.closeOnce.Do(func() { close(s.closed) }) }
 // Done returns a channel closed when the session ends.
 func (s *Session) Done() <-chan struct{} { return s.closed }
 
+// TakeSeq reports whether the browser message numbered seq is new, and takes
+// note of it. The browser sends them one at a time in rising order and sends
+// one again when it got no answer, so a number not above the last is a repeat.
+func (s *Session) TakeSeq(seq uint64) bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if seq <= s.inSeq {
+		return false
+	}
+	s.inSeq = seq
+	return true
+}
+
 // PushIn appends a downstream frame (panel -> agent) and wakes the agent poll.
 func (s *Session) PushIn(f proto.InFrame) {
 	s.mu.Lock()
@@ -261,6 +282,18 @@ func (s *Session) PushIn(f proto.InFrame) {
 	}
 }
 
+// Unpoll puts frames taken by PollIn back in front, for frames that could not
+// be delivered.
+func (s *Session) Unpoll(frames []proto.InFrame) {
+	s.mu.Lock()
+	s.inBuf = append(append([]proto.InFrame{}, frames...), s.inBuf...)
+	s.mu.Unlock()
+	select {
+	case s.inSignal <- struct{}{}:
+	default:
+	}
+}
+
 // PollIn drains queued downstream frames, blocking up to timeout for the first.
 func (s *Session) PollIn(timeout time.Duration) ([]proto.InFrame, bool) {
 	deadline := time.After(timeout)
@@ -298,10 +331,18 @@ func (s *Session) Out() <-chan proto.OutMessage { return s.out }
 
 // PollOut drains queued upstream messages, blocking up to timeout for the first.
 func (s *Session) PollOut(timeout time.Duration) ([]proto.OutMessage, bool) {
+	return s.PollOutUntil(nil, timeout)
+}
+
+// PollOutUntil is PollOut that also gives up when done closes, taking
+// nothing: for a reader that has gone, so no output is lost on it.
+func (s *Session) PollOutUntil(done <-chan struct{}, timeout time.Duration) ([]proto.OutMessage, bool) {
 	var batch []proto.OutMessage
 	select {
 	case m := <-s.out:
 		batch = append(batch, m)
+	case <-done:
+		return nil, true
 	case <-time.After(timeout):
 		return nil, true
 	case <-s.closed:

internal/server/passkeys.go

@@ -0,0 +1,644 @@
+package server
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/binary"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math/big"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+)
+
+// Passkeys (WebAuthn): an admin signs in with a key held by the device - a
+// fingerprint, the phone's lock, a hardware key - instead of a password. With
+// a key in place, the admin can turn the password off in their account.
+//
+// Attestation is not checked ("none"): the panel trusts any authenticator,
+// it only needs the public key and, at sign-in, a signature made with it.
+
+var b64u = base64.RawURLEncoding
+
+// challenges are the ones handed out and not yet used, a few minutes each.
+type challenges struct {
+	mu sync.Mutex
+	m  map[string]challenge
+}
+
+type challenge struct {
+	adminID int64 // the admin registering a key; 0 for a sign-in
+	expires time.Time
+}
+
+func (c *challenges) issue(adminID int64) string {
+	b := make([]byte, 32)
+	if _, err := rand.Read(b); err != nil {
+		panic("crypto/rand failed: " + err.Error())
+	}
+	id := b64u.EncodeToString(b)
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.m == nil {
+		c.m = map[string]challenge{}
+	}
+	for k, v := range c.m {
+		if time.Now().After(v.expires) {
+			delete(c.m, k)
+		}
+	}
+	c.m[id] = challenge{adminID: adminID, expires: time.Now().Add(5 * time.Minute)}
+	return id
+}
+
+// take uses up a challenge: true when it was issued, for this admin, and is
+// still fresh.
+func (c *challenges) take(id string, adminID int64) bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	ch, ok := c.m[id]
+	delete(c.m, id)
+	return ok && ch.adminID == adminID && time.Now().Before(ch.expires)
+}
+
+// mainHost is the main address's host name, set when the server starts.
+var mainHost = func() string { return "" }
+
+// rpID is the site the keys belong to: the host the browser is on, or the
+// main address's host when the browser is on it or under it - so the keys
+// made on lpra.example.com also sign in on direct.lpra.example.com.
+func rpID(r *http.Request) string {
+	host := r.Host
+	if h, _, err := net.SplitHostPort(host); err == nil {
+		host = h
+	}
+	if m := mainHost(); m != "" && strings.HasSuffix(host, "."+m) {
+		return m
+	}
+	return host
+}
+
+// checkClientData verifies what the browser signed over: the kind of
+// ceremony, our challenge and our origin. A proxy in front may speak plain
+// http to us, so the origin is matched by host, and must be https unless the
+// panel is on this machine.
+func checkClientData(r *http.Request, raw []byte, typ string, adminID int64, ch *challenges) error {
+	var cd struct {
+		Type      string `json:"type"`
+		Challenge string `json:"challenge"`
+		Origin    string `json:"origin"`
+	}
+	if err := json.Unmarshal(raw, &cd); err != nil {
+		return errors.New("ответ ключа не читается")
+	}
+	if cd.Type != typ {
+		return errors.New("ответ ключа не того вида")
+	}
+	if !ch.take(cd.Challenge, adminID) {
+		return errors.New("запрос устарел - попробуйте ещё раз")
+	}
+	u, err := url.Parse(cd.Origin)
+	if err != nil || u.Host != r.Host {
+		return errors.New("ключ подписал запрос для другого сайта")
+	}
+	local := u.Hostname() == "localhost" || u.Hostname() == "127.0.0.1" || u.Hostname() == "::1"
+	if u.Scheme != "https" && !local {
+		return errors.New("ключи доступа работают только по https")
+	}
+	return nil
+}
+
+// authData is the authenticator's part: rpIdHash, flags, counter, then the
+// new credential at registration.
+type authData struct {
+	rpIDHash  []byte
+	flags     byte
+	signCount uint32
+	credID    []byte
+	coseKey   []byte
+}
+
+func parseAuthData(b []byte, wantCred bool) (*authData, error) {
+	if len(b) < 37 {
+		return nil, errors.New("данные ключа слишком короткие")
+	}
+	ad := &authData{rpIDHash: b[:32], flags: b[32], signCount: binary.BigEndian.Uint32(b[33:37])}
+	if !wantCred {
+		return ad, nil
+	}
+	if ad.flags&0x40 == 0 || len(b) < 37+18 {
+		return nil, errors.New("ключ не прислал себя")
+	}
+	n := int(binary.BigEndian.Uint16(b[53:55]))
+	if len(b) < 55+n {
+		return nil, errors.New("данные ключа обрезаны")
+	}
+	ad.credID = b[55 : 55+n]
+	ad.coseKey = b[55+n:]
+	return ad, nil
+}
+
+func (ad *authData) check(r *http.Request) error {
+	sum := sha256.Sum256([]byte(rpID(r)))
+	if !bytes.Equal(ad.rpIDHash, sum[:]) {
+		return errors.New("ключ создан для другого сайта")
+	}
+	if ad.flags&0x01 == 0 {
+		return errors.New("ключ не подтвердил присутствие")
+	}
+	return nil
+}
+
+// coseToPKIX turns a COSE public key (ES256, RS256 or EdDSA) into PKIX DER.
+func coseToPKIX(raw []byte) ([]byte, error) {
+	v, _, err := cborDecode(raw)
+	if err != nil {
+		return nil, err
+	}
+	m, ok := v.(map[any]any)
+	if !ok {
+		return nil, errors.New("ключ не в формате COSE")
+	}
+	num := func(k int64) int64 { n, _ := m[k].(int64); return n }
+	bin := func(k int64) []byte { b, _ := m[k].([]byte); return b }
+	var pub any
+	switch num(1) { // kty
+	case 2: // EC2
+		x, y := bin(-2), bin(-3)
+		if num(-1) != 1 || len(x) != 32 || len(y) != 32 {
+			return nil, errors.New("поддерживается только кривая P-256")
+		}
+		k := &ecdsa.PublicKey{Curve: elliptic.P256(), X: new(big.Int).SetBytes(x), Y: new(big.Int).SetBytes(y)}
+		if !k.Curve.IsOnCurve(k.X, k.Y) {
+			return nil, errors.New("ключ не на кривой")
+		}
+		pub = k
+	case 3: // RSA
+		n, e := bin(-1), bin(-2)
+		if len(n) < 256 || len(e) == 0 || len(e) > 4 {
+			return nil, errors.New("неподходящий ключ RSA")
+		}
+		pub = &rsa.PublicKey{N: new(big.Int).SetBytes(n), E: int(new(big.Int).SetBytes(e).Int64())}
+	case 1: // OKP
+		x := bin(-2)
+		if num(-1) != 6 || len(x) != ed25519.PublicKeySize {
+			return nil, errors.New("поддерживается только Ed25519")
+		}
+		pub = ed25519.PublicKey(x)
+	default:
+		return nil, errors.New("неизвестный вид ключа")
+	}
+	return x509.MarshalPKIXPublicKey(pub)
+}
+
+func verifySig(der, data, sig []byte) bool {
+	pub, err := x509.ParsePKIXPublicKey(der)
+	if err != nil {
+		return false
+	}
+	sum := sha256.Sum256(data)
+	switch k := pub.(type) {
+	case *ecdsa.PublicKey:
+		return ecdsa.VerifyASN1(k, sum[:], sig)
+	case *rsa.PublicKey:
+		return rsa.VerifyPKCS1v15(k, crypto.SHA256, sum[:], sig) == nil
+	case ed25519.PublicKey:
+		return ed25519.Verify(k, data, sig)
+	}
+	return false
+}
+
+// ---------- CBOR, as much as WebAuthn needs ----------
+
+func cborDecode(b []byte) (any, []byte, error) {
+	r := &cborReader{b: b}
+	v, err := r.item(0)
+	return v, r.b[r.i:], err
+}
+
+type cborReader struct {
+	b []byte
+	i int
+}
+
+var errCBOR = errors.New("данные ключа повреждены")
+
+func (r *cborReader) arg(info byte) (uint64, error) {
+	size := map[byte]int{24: 1, 25: 2, 26: 4, 27: 8}
+	if info < 24 {
+		return uint64(info), nil
+	}
+	n, ok := size[info]
+	if !ok || r.i+n > len(r.b) {
+		return 0, errCBOR
+	}
+	var v uint64
+	for _, c := range r.b[r.i : r.i+n] {
+		v = v<<8 | uint64(c)
+	}
+	r.i += n
+	return v, nil
+}
+
+func (r *cborReader) take(n uint64) ([]byte, error) {
+	if n > uint64(len(r.b)-r.i) {
+		return nil, errCBOR
+	}
+	out := r.b[r.i : r.i+int(n)]
+	r.i += int(n)
+	return out, nil
+}
+
+func (r *cborReader) item(depth int) (any, error) {
+	if r.i >= len(r.b) || depth > 16 {
+		return nil, errCBOR
+	}
+	ib := r.b[r.i]
+	r.i++
+	major, info := ib>>5, ib&31
+	if major == 7 {
+		switch info {
+		case 20:
+			return false, nil
+		case 21:
+			return true, nil
+		case 22, 23:
+			return nil, nil
+		}
+		_, err := r.arg(info) // a float: not used, skipped
+		return nil, err
+	}
+	n, err := r.arg(info)
+	if err != nil {
+		return nil, err
+	}
+	switch major {
+	case 0:
+		return int64(n), nil
+	case 1:
+		return -1 - int64(n), nil
+	case 2:
+		return r.take(n)
+	case 3:
+		s, err := r.take(n)
+		return string(s), err
+	case 4:
+		if n > 1024 {
+			return nil, errCBOR
+		}
+		arr := make([]any, 0, n)
+		for k := uint64(0); k < n; k++ {
+			v, err := r.item(depth + 1)
+			if err != nil {
+				return nil, err
+			}
+			arr = append(arr, v)
+		}
+		return arr, nil
+	case 5:
+		if n > 1024 {
+			return nil, errCBOR
+		}
+		m := make(map[any]any, n)
+		for k := uint64(0); k < n; k++ {
+			key, err := r.item(depth + 1)
+			if err != nil {
+				return nil, err
+			}
+			v, err := r.item(depth + 1)
+			if err != nil {
+				return nil, err
+			}
+			switch key.(type) {
+			case int64, string:
+				m[key] = v
+			default:
+				return nil, errCBOR
+			}
+		}
+		return m, nil
+	case 6:
+		return r.item(depth + 1) // a tag: its content
+	}
+	return nil, errCBOR
+}
+
+// ---------- handlers ----------
+
+func credParams() []map[string]any {
+	return []map[string]any{
+		{"type": "public-key", "alg": -7},   // ES256
+		{"type": "public-key", "alg": -8},   // EdDSA
+		{"type": "public-key", "alg": -257}, // RS256
+	}
+}
+
+func userHandle(id int64) string {
+	b := make([]byte, 8)
+	binary.BigEndian.PutUint64(b, uint64(id))
+	return b64u.EncodeToString(b)
+}
+
+// GET /api/panel/account - who is signed in, and their passkeys.
+func (s *Server) handleAccount(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	keys, _ := s.db.ListAdminKeys(a.ID)
+	list := []map[string]any{}
+	for _, k := range keys {
+		list = append(list, map[string]any{"id": k.ID, "name": k.Name, "created": k.CreatedAt, "last_used": k.LastUsed})
+	}
+	writeJSON(w, map[string]any{"username": a.Username, "keys": list, "password_off": s.db.PasswordOff(a.ID), "pin": s.db.AdminPin(a.ID) != "",
+		"pw_locked": a.PwLocked, "admin": a.IsAdmin()})
+}
+
+// POST /api/panel/account/password/change - a new password, given the
+// current one.
+func (s *Server) handlePasswordChange(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	var in struct {
+		Current string `json:"current"`
+		New     string `json:"new"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 4<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	ip := clientIP(r)
+	if s.limiter.blocked(ip) {
+		writeJSON(w, map[string]any{"ok": false, "error": "Слишком много попыток. Подождите немного."})
+		return
+	}
+	if !checkPassword(a.PassHash, in.Current) {
+		s.limiter.fin(ip, false)
+		writeJSON(w, map[string]any{"ok": false, "error": "текущий пароль не тот"})
+		return
+	}
+	if len(in.New) < 8 {
+		writeJSON(w, map[string]any{"ok": false, "error": "новый пароль - не короче 8 символов"})
+		return
+	}
+	hash, err := hashPassword(in.New)
+	if err == nil {
+		err = s.db.SetAdminPassword(a.ID, hash)
+	}
+	if err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+		return
+	}
+	s.limiter.fin(ip, true)
+	s.db.Audit(a.ID, "", "password_change")
+	writeJSON(w, map[string]any{"ok": true})
+}
+
+// POST /api/panel/account/password {"off": bool} - turn signing in with the
+// password off or on again. Off only with a passkey to sign in with.
+func (s *Server) handlePasswordToggle(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	var in struct {
+		Off bool `json:"off"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	if a.PwLocked {
+		writeJSON(w, map[string]any{"ok": false, "error": "вход по паролю закрепил администратор"})
+		return
+	}
+	if in.Off && s.db.CountAdminKeys(a.ID) == 0 {
+		writeJSON(w, map[string]any{"ok": false, "error": "сначала добавьте ключ доступа"})
+		return
+	}
+	if err := s.db.SetPasswordOff(a.ID, in.Off); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+		return
+	}
+	action := "password_on"
+	if in.Off {
+		action = "password_off"
+	}
+	s.db.Audit(a.ID, "", action)
+	writeJSON(w, map[string]any{"ok": true})
+}
+
+// POST /api/panel/account/keys/begin - options to make a new passkey with.
+func (s *Server) handleKeyRegisterBegin(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	keys, _ := s.db.ListAdminKeys(a.ID)
+	exclude := []map[string]any{}
+	for _, k := range keys {
+		exclude = append(exclude, map[string]any{"type": "public-key", "id": b64u.EncodeToString(k.CredID)})
+	}
+	writeJSON(w, map[string]any{"ok": true, "options": map[string]any{
+		"challenge":          s.challenges.issue(a.ID),
+		"rp":                 map[string]any{"id": rpID(r), "name": "LPRA"},
+		"user":               map[string]any{"id": userHandle(a.ID), "name": a.Username, "displayName": a.Username},
+		"pubKeyCredParams":   credParams(),
+		"excludeCredentials": exclude,
+		"authenticatorSelection": map[string]any{
+			"residentKey": "preferred", "userVerification": "preferred",
+		},
+		"attestation": "none",
+		"timeout":     120000,
+	}})
+}
+
+// POST /api/panel/account/keys/finish - keep the passkey the browser made.
+func (s *Server) handleKeyRegisterFinish(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	var in struct {
+		Name              string `json:"name"`
+		ClientDataJSON    string `json:"clientDataJSON"`
+		AttestationObject string `json:"attestationObject"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	fail := func(err error) { writeJSON(w, map[string]any{"ok": false, "error": err.Error()}) }
+	cd, err1 := b64u.DecodeString(in.ClientDataJSON)
+	att, err2 := b64u.DecodeString(in.AttestationObject)
+	if err1 != nil || err2 != nil {
+		fail(errors.New("плохой запрос"))
+		return
+	}
+	if err := checkClientData(r, cd, "webauthn.create", a.ID, &s.challenges); err != nil {
+		fail(err)
+		return
+	}
+	v, _, err := cborDecode(att)
+	m, ok := v.(map[any]any)
+	if err != nil || !ok {
+		fail(errCBOR)
+		return
+	}
+	raw, _ := m["authData"].([]byte)
+	ad, err := parseAuthData(raw, true)
+	if err != nil {
+		fail(err)
+		return
+	}
+	if err := ad.check(r); err != nil {
+		fail(err)
+		return
+	}
+	der, err := coseToPKIX(ad.coseKey)
+	if err != nil {
+		fail(err)
+		return
+	}
+	if k, _ := s.db.AdminKeyByCredID(ad.credID); k != nil {
+		fail(errors.New("этот ключ уже добавлен"))
+		return
+	}
+	name := strings.TrimSpace(in.Name)
+	if name == "" {
+		name = "ключ " + time.Now().Format("02.01.2006")
+	}
+	if len(name) > 60 {
+		name = name[:60]
+	}
+	if err := s.db.AddAdminKey(AdminKey{AdminID: a.ID, CredID: ad.credID, PublicKey: der, SignCount: ad.signCount, Name: name}); err != nil {
+		fail(err)
+		return
+	}
+	s.db.Audit(a.ID, "", "passkey_add:"+name)
+	writeJSON(w, map[string]any{"ok": true})
+}
+
+// POST /api/panel/account/keys/{id}/delete
+func (s *Server) handleKeyDelete(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	id, _ := strconv.ParseInt(r.PathValue("id"), 10, 64)
+	if err := s.db.DeleteAdminKey(a.ID, id); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+		return
+	}
+	s.db.Audit(a.ID, "", "passkey_delete:"+strconv.FormatInt(id, 10))
+	writeJSON(w, map[string]any{"ok": true})
+}
+
+// POST /api/login/key/begin - options to sign in with a passkey. With a
+// username, its keys are named, for keys that do not keep the account
+// themselves.
+func (s *Server) handleKeyLoginBegin(w http.ResponseWriter, r *http.Request) {
+	if s.limiter.blocked(clientIP(r)) {
+		writeJSON(w, map[string]any{"ok": false, "error": "Слишком много попыток. Подождите немного."})
+		return
+	}
+	var in struct {
+		Username string `json:"username"`
+	}
+	_ = json.NewDecoder(http.MaxBytesReader(w, r.Body, 4<<10)).Decode(&in)
+	allow := []map[string]any{}
+	if u := strings.TrimSpace(in.Username); u != "" {
+		if a, _ := s.db.AdminByUsername(u); a != nil {
+			keys, _ := s.db.ListAdminKeys(a.ID)
+			for _, k := range keys {
+				allow = append(allow, map[string]any{"type": "public-key", "id": b64u.EncodeToString(k.CredID)})
+			}
+		}
+	}
+	writeJSON(w, map[string]any{"ok": true, "options": map[string]any{
+		"challenge":        s.challenges.issue(0),
+		"rpId":             rpID(r),
+		"allowCredentials": allow,
+		"userVerification": "preferred",
+		"timeout":          120000,
+	}})
+}
+
+// POST /api/login/key/finish - check the signature and sign the admin in.
+func (s *Server) handleKeyLoginFinish(w http.ResponseWriter, r *http.Request) {
+	ip := clientIP(r)
+	if s.limiter.blocked(ip) {
+		writeJSON(w, map[string]any{"ok": false, "error": "Слишком много попыток. Подождите немного."})
+		return
+	}
+	var in struct {
+		ID                string `json:"id"`
+		ClientDataJSON    string `json:"clientDataJSON"`
+		AuthenticatorData string `json:"authenticatorData"`
+		Signature         string `json:"signature"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	fail := func(msg string) {
+		s.limiter.fin(ip, false)
+		writeJSON(w, map[string]any{"ok": false, "error": msg})
+	}
+	credID, e1 := b64u.DecodeString(in.ID)
+	cd, e2 := b64u.DecodeString(in.ClientDataJSON)
+	rawAD, e3 := b64u.DecodeString(in.AuthenticatorData)
+	sig, e4 := b64u.DecodeString(in.Signature)
+	if e1 != nil || e2 != nil || e3 != nil || e4 != nil {
+		fail("плохой запрос")
+		return
+	}
+	k, _ := s.db.AdminKeyByCredID(credID)
+	if k == nil {
+		fail("этот ключ здесь не привязан ни к одному аккаунту")
+		return
+	}
+	if err := checkClientData(r, cd, "webauthn.get", 0, &s.challenges); err != nil {
+		fail(err.Error())
+		return
+	}
+	ad, err := parseAuthData(rawAD, false)
+	if err == nil {
+		err = ad.check(r)
+	}
+	if err != nil {
+		fail(err.Error())
+		return
+	}
+	cdHash := sha256.Sum256(cd)
+	if !verifySig(k.PublicKey, append(append([]byte{}, rawAD...), cdHash[:]...), sig) {
+		fail("подпись ключа не сошлась")
+		return
+	}
+	// A counter that goes back means a copy of the key is in use.
+	if ad.signCount != 0 && k.SignCount != 0 && ad.signCount <= k.SignCount {
+		fail("ключ похож на копию: счётчик не вырос")
+		return
+	}
+	_ = s.db.UseAdminKey(k.ID, ad.signCount)
+	s.limiter.fin(ip, true)
+	if err := s.setSession(w, k.AdminID); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "внутренняя ошибка"})
+		return
+	}
+	s.db.Audit(k.AdminID, "", "login_passkey:"+k.Name)
+	writeJSON(w, map[string]any{"ok": true})
+}
+
+// POST /settings/admins/keys/reset - drop all passkeys of an admin, who signs
+// in with the password again: for one who lost theirs.
+func (s *Server) handleResetAdminKeys(w http.ResponseWriter, r *http.Request) {
+	if !checkCSRF(r) {
+		http.Error(w, "bad csrf", http.StatusForbidden)
+		return
+	}
+	id, _ := strconv.ParseInt(r.FormValue("id"), 10, 64)
+	_ = s.db.DeleteAdminKeys(id)
+	if a := s.currentAdmin(r); a != nil {
+		s.db.Audit(a.ID, "", fmt.Sprintf("passkeys_reset:%d", id))
+	}
+	http.Redirect(w, r, "/settings", http.StatusSeeOther)
+}

internal/server/pin.go

@@ -0,0 +1,108 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+	"regexp"
+	"sync"
+)
+
+// The PIN: four digits an admin can set, asked for by the page in every new
+// browser tab (a reload of the same tab does not ask again). The server
+// checks it; five wrong ones in a row end the session.
+
+var pinRe = regexp.MustCompile(`^[0-9]{4}$`)
+
+// pinMisses counts wrong PINs per session.
+type pinMisses struct {
+	mu sync.Mutex
+	m  map[string]int
+}
+
+func (p *pinMisses) miss(sid string) int {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	if p.m == nil {
+		p.m = map[string]int{}
+	}
+	p.m[sid]++
+	return p.m[sid]
+}
+
+func (p *pinMisses) clear(sid string) {
+	p.mu.Lock()
+	delete(p.m, sid)
+	p.mu.Unlock()
+}
+
+// GET /api/panel/pin - whether the admin has a PIN to ask for.
+func (s *Server) handlePinState(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	w.Header().Set("Cache-Control", "no-store")
+	writeJSON(w, map[string]any{"pin": s.db.AdminPin(a.ID) != ""})
+}
+
+// POST /api/panel/pin/check {"pin"} - the PIN typed in a new tab.
+func (s *Server) handlePinCheck(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	var in struct {
+		Pin string `json:"pin"`
+	}
+	_ = json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<10)).Decode(&in)
+	h := s.db.AdminPin(a.ID)
+	c, _ := r.Cookie(sessionCookie)
+	if h == "" || (pinRe.MatchString(in.Pin) && checkPassword(h, in.Pin)) {
+		s.pinMisses.clear(c.Value)
+		writeJSON(w, map[string]any{"ok": true})
+		return
+	}
+	if n := s.pinMisses.miss(c.Value); n >= 5 {
+		s.pinMisses.clear(c.Value)
+		s.clearSession(w, r)
+		s.db.Audit(a.ID, "", "pin_lockout")
+		writeJSON(w, map[string]any{"ok": false, "out": true, "error": "слишком много неверных попыток"})
+		return
+	} else {
+		writeJSON(w, map[string]any{"ok": false, "left": 5 - n, "error": "неверный PIN"})
+	}
+}
+
+// POST /api/panel/account/pin {"pin", "current"} - set or change the PIN;
+// with pin empty, remove it. A PIN in place is needed to change or drop it.
+func (s *Server) handlePinSet(w http.ResponseWriter, r *http.Request) {
+	a := s.currentAdmin(r)
+	var in struct {
+		Pin     string `json:"pin"`
+		Current string `json:"current"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 1<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	if h := s.db.AdminPin(a.ID); h != "" && !checkPassword(h, in.Current) {
+		writeJSON(w, map[string]any{"ok": false, "error": "текущий PIN не тот"})
+		return
+	}
+	hash := ""
+	if in.Pin != "" {
+		if !pinRe.MatchString(in.Pin) {
+			writeJSON(w, map[string]any{"ok": false, "error": "PIN - ровно 4 цифры"})
+			return
+		}
+		var err error
+		if hash, err = hashPassword(in.Pin); err != nil {
+			writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+			return
+		}
+	}
+	if err := s.db.SetAdminPin(a.ID, hash); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": err.Error()})
+		return
+	}
+	action := "pin_set"
+	if hash == "" {
+		action = "pin_remove"
+	}
+	s.db.Audit(a.ID, "", action)
+	writeJSON(w, map[string]any{"ok": true})
+}

internal/server/server.go

@@ -1,7 +1,9 @@
 package server
 
 import (
+	"crypto/sha256"
 	"embed"
+	"encoding/hex"
 	"html/template"
 	"io/fs"
 	"log"
@@ -56,6 +58,13 @@ type Server struct {
 	stats      statCache         // last load sample per agent, for the status page
 	relays     speedRelays       // speed tests that run through the browser
 	meters     speedMeters       // byte counts of the speed tests under way
+	xfers      xfers             // files on their way between a browser and an agent
+	ship       shipping          // files on their way from one machine to another
+	viaDirectA sync.Map          // agent id -> true while it reaches the server at the direct address
+	challenges challenges        // passkey challenges handed out
+	wsAgents   wsAgents          // agents on their WebSocket now
+	pinMisses  pinMisses         // wrong PINs per session
+	assets     map[string]string // static file -> hash of its content
 }
 
 // New builds the server, parsing embedded templates.
@@ -63,7 +72,15 @@ func New(opts Options) (*Server, error) {
 	if err := opts.DB.ensureDefaults(); err != nil {
 		return nil, err
 	}
-	tmpl, err := template.ParseFS(webFS, "web/templates/*.html")
+	mainHost = func() string { return directHost(opts.DB.HostAddress()) }
+	staticFS, _ := fs.Sub(webFS, "web/static")
+	assets := assetHashes(staticFS)
+	funcs := template.FuncMap{
+		// asset is a static file's URL with its content hash, so a new
+		// release is a new URL that no browser or proxy has cached.
+		"asset": func(name string) string { return "/static/" + name + "?v=" + assets[name] },
+	}
+	tmpl, err := template.New("").Funcs(funcs).ParseFS(webFS, "web/templates/*.html")
 	if err != nil {
 		return nil, err
 	}
@@ -89,6 +106,7 @@ func New(opts Options) (*Server, error) {
 		distDir:       opts.DistDir,
 		secureCookies: opts.SecureCookies,
 		installTmpl:   installTmpl,
+		assets:        assets,
 	}
 	s.ufw = newUfwManager(opts.DB, s.TunnelPort)
 	// Start the direct forward tunnel (TCP mux + UDP), on the port from the
@@ -123,13 +141,19 @@ func (s *Server) tunnelListenAddr(port int) string {
 }
 
 // tunnelAdvert is the tunnel address handed to agents as "host:port". The host
-// is empty unless one is set in Settings; agents then use the panel's host.
+// is the one set in Settings, else the direct address's (the main one may be
+// behind a proxy that carries no raw TCP), else empty: agents then use the
+// panel's host.
 func (s *Server) tunnelAdvert() string {
 	port := s.TunnelPort()
 	if port == 0 {
 		return ""
 	}
-	return net.JoinHostPort(s.db.TunnelHost(), strconv.Itoa(port))
+	host := s.db.TunnelHost()
+	if host == "" {
+		host = directHost(s.db.DirectAddress())
+	}
+	return net.JoinHostPort(host, strconv.Itoa(port))
 }
 
 // setTunnelPort moves the direct tunnel to another port. Connected agents are
@@ -183,7 +207,7 @@ func (s *Server) Handler() http.Handler {
 
 	// Static assets (xterm.js etc.) from the embedded FS.
 	staticFS, _ := fs.Sub(webFS, "web/static")
-	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.FS(staticFS))))
+	mux.Handle("GET /static/", http.StripPrefix("/static/", staticHandler(staticFS, s.assets)))
 
 	// Public: install script + agent binary downloads.
 	mux.HandleFunc("GET /install.sh", s.handleInstallScript)
@@ -198,6 +222,8 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("GET /login", s.handleLoginForm)
 	mux.HandleFunc("POST /login", s.handleLoginSubmit)
 	mux.HandleFunc("POST /logout", s.handleLogout)
+	mux.HandleFunc("POST /api/login/key/begin", s.handleKeyLoginBegin)
+	mux.HandleFunc("POST /api/login/key/finish", s.handleKeyLoginFinish)
 
 	// Panel (admin-only).
 	mux.Handle("GET /{$}", s.requireAdmin(s.handleDashboard))
@@ -209,26 +235,48 @@ func (s *Server) Handler() http.Handler {
 	mux.Handle("POST /agents/{id}/rename", s.requireAdmin(s.handleAgentRename))
 	mux.Handle("POST /agents/{id}/update", s.requireAdmin(s.handleAgentUpdate))
 	mux.Handle("POST /agents/{id}/user", s.requireAdmin(s.handleAgentSetUser))
+	mux.Handle("POST /agents/{id}/transport", s.requireAdmin(s.handleAgentTransport))
 	mux.Handle("POST /agents/{id}/users/add", s.requireAdmin(s.handleAgentAddUser))
-	mux.Handle("POST /agents/{id}/delete", s.requireAdmin(s.handleAgentDelete))
+	mux.Handle("POST /agents/{id}/delete", s.adminsOnly(s.handleAgentDelete))
-	mux.Handle("GET /settings", s.requireAdmin(s.handleSettings))
+	mux.Handle("GET /settings", s.adminsOnly(s.handleSettings))
-	mux.Handle("POST /settings/host", s.requireAdmin(s.handleSetHost))
+	mux.Handle("POST /settings/host", s.adminsOnly(s.handleSetHost))
-	mux.Handle("POST /settings/tunnel", s.requireAdmin(s.handleSetTunnel))
+	mux.Handle("POST /settings/tunnel", s.adminsOnly(s.handleSetTunnel))
-	mux.Handle("POST /settings/secret/rotate", s.requireAdmin(s.handleRotateSecret))
+	mux.Handle("POST /settings/secret/rotate", s.adminsOnly(s.handleRotateSecret))
-	mux.Handle("POST /settings/admins/add", s.requireAdmin(s.handleAddAdmin))
+	mux.Handle("POST /settings/install/code", s.adminsOnly(s.handleInstallCode))
-	mux.Handle("POST /settings/admins/delete", s.requireAdmin(s.handleDeleteAdmin))
+	mux.Handle("POST /settings/admins/add", s.adminsOnly(s.handleAddAdmin))
-	mux.Handle("POST /settings/ufw/toggle", s.requireAdmin(s.handleUfwToggle))
+	mux.Handle("POST /settings/admins/delete", s.adminsOnly(s.handleDeleteAdmin))
-	mux.Handle("POST /settings/ufw/add", s.requireAdmin(s.handleUfwAdd))
+	mux.Handle("GET /api/panel/users/{id}/agents", s.adminsOnly(s.handleUserAgents))
-	mux.Handle("POST /settings/ufw/revoke", s.requireAdmin(s.handleUfwRevoke))
+	mux.Handle("POST /api/panel/users/{id}", s.adminsOnly(s.handleUserEdit))
+	mux.Handle("POST /settings/admins/keys/reset", s.adminsOnly(s.handleResetAdminKeys))
+	mux.Handle("GET /api/panel/account", s.requireAdmin(s.handleAccount))
+	mux.Handle("POST /api/panel/account/keys/begin", s.requireAdmin(s.handleKeyRegisterBegin))
+	mux.Handle("POST /api/panel/account/keys/finish", s.requireAdmin(s.handleKeyRegisterFinish))
+	mux.Handle("POST /api/panel/account/keys/{id}/delete", s.requireAdmin(s.handleKeyDelete))
+	mux.Handle("POST /api/panel/account/password", s.requireAdmin(s.handlePasswordToggle))
+	mux.Handle("POST /api/panel/account/pin", s.requireAdmin(s.handlePinSet))
+	mux.Handle("GET /api/panel/pin", s.requireAdmin(s.handlePinState))
+	mux.Handle("POST /api/panel/pin/check", s.requireAdmin(s.handlePinCheck))
+	mux.Handle("POST /api/panel/account/password/change", s.requireAdmin(s.handlePasswordChange))
+	mux.Handle("POST /settings/ufw/toggle", s.adminsOnly(s.handleUfwToggle))
+	mux.Handle("POST /settings/ufw/add", s.adminsOnly(s.handleUfwAdd))
+	mux.Handle("POST /settings/ufw/revoke", s.adminsOnly(s.handleUfwRevoke))
 
 	// Panel terminal over HTTP long-polling (admin-only).
 	mux.Handle("POST /api/panel/term/{agentID}/open", s.requireAdmin(s.handlePanelOpen))
 	mux.Handle("GET /api/panel/term/{sid}/out", s.requireAdmin(s.handlePanelOut))
 	mux.Handle("POST /api/panel/term/{sid}/in", s.requireAdmin(s.handlePanelIn))
+	mux.Handle("GET /api/panel/term/{sid}/ws", s.requireAdmin(s.handlePanelTermWS))
 	mux.Handle("POST /api/panel/term/{sid}/close", s.requireAdmin(s.handlePanelClose))
 
 	// Panel file manager (admin-only).
 	mux.Handle("GET /api/panel/agents/{id}/fs/download", s.requireAdmin(s.handleFSDownload))
+	mux.Handle("POST /api/panel/agents/{id}/fs/upload", s.requireAdmin(s.handleFSUploadStart))
+	mux.Handle("PUT /api/panel/fs/xfer/{xid}/{i}", s.requireAdmin(s.handleXferPut))
+	mux.Handle("POST /api/panel/fs/xfer/{xid}/cancel", s.requireAdmin(s.handleXferCancel))
+	mux.Handle("GET /api/panel/fs/xfer/{xid}/result", s.requireAdmin(s.handleXferResult))
+	mux.Handle("POST /api/panel/agents/{id}/fs/ship", s.requireAdmin(s.handleFSShip))
+	mux.Handle("GET /api/panel/fs/job/{jid}", s.requireAdmin(s.handleShipJob))
+	mux.Handle("POST /api/panel/fs/job/{jid}/cancel", s.requireAdmin(s.handleShipCancel))
 	mux.Handle("POST /api/panel/agents/{id}/fs/{op}", s.requireAdmin(s.handleFSOp))
 
 	// Machine status (admin).
@@ -248,6 +296,7 @@ func (s *Server) Handler() http.Handler {
 	// Agent API (token/secret auth inside handlers).
 	mux.HandleFunc("POST /api/agent/enroll", s.handleEnroll)
 	mux.HandleFunc("GET /api/agent/poll", s.handlePoll)
+	mux.HandleFunc("GET /api/agent/ws", s.handleAgentWS)
 	mux.HandleFunc("GET /api/agent/config", s.handleAgentConfig)
 	mux.HandleFunc("GET /api/agent/term/{sid}/in", s.handleTermIn)
 	mux.HandleFunc("POST /api/agent/term/{sid}/out", s.handleTermOut)
@@ -257,6 +306,11 @@ func (s *Server) Handler() http.Handler {
 	mux.HandleFunc("POST /api/agent/speed/up", s.handleSpeedUp)
 	mux.HandleFunc("GET /api/agent/speed/relay/down", s.handleSpeedRelayDown)
 	mux.HandleFunc("POST /api/agent/speed/relay/up", s.handleSpeedRelayUp)
+	mux.HandleFunc("GET /api/agent/fs/xfer/{xid}/{i}", s.handleAgentXferGet)
+	mux.HandleFunc("POST /api/agent/fs/xfer/{xid}/{i}", s.handleAgentXferPost)
+	mux.HandleFunc("POST /api/agent/fs/job/{jid}/progress", s.handleShipProgress)
+	mux.HandleFunc("POST /api/agent/fs/relay/{rid}/{i}", s.handleRelayPost)
+	mux.HandleFunc("GET /api/agent/fs/relay/{rid}/{i}", s.handleRelayGet)
 
 	return s.logRequests(mux)
 }
@@ -273,6 +327,36 @@ func (s *Server) requireAdmin(h http.HandlerFunc) http.Handler {
 			http.Redirect(w, r, "/login", http.StatusSeeOther)
 			return
 		}
+		// A user who is not an admin uses only the machines given to them:
+		// any other is as if it were not there.
+		if !admin.IsAdmin() {
+			p := r.URL.Path
+			if strings.HasPrefix(p, "/agents/") || strings.HasPrefix(p, "/api/panel/agents/") || strings.HasPrefix(p, "/api/panel/term/") {
+				id := r.PathValue("id")
+				if id == "" {
+					id = r.PathValue("agentID")
+				}
+				if id != "" && id != "presence" && !s.db.CanUseAgent(admin, id) {
+					http.NotFound(w, r)
+					return
+				}
+			}
+		}
+		h(w, r)
+	})
+}
+
+// adminsOnly lets only admins through: the settings, users, the firewall.
+func (s *Server) adminsOnly(h http.HandlerFunc) http.Handler {
+	return s.requireAdmin(func(w http.ResponseWriter, r *http.Request) {
+		if !s.currentAdmin(r).IsAdmin() {
+			if r.Method == http.MethodGet && !strings.HasPrefix(r.URL.Path, "/api/") {
+				http.Redirect(w, r, "/", http.StatusSeeOther)
+				return
+			}
+			http.Error(w, "только для администраторов", http.StatusForbidden)
+			return
+		}
 		h(w, r)
 	})
 }
@@ -326,3 +410,39 @@ func clientIP(r *http.Request) string {
 	}
 	return host
 }
+
+// assetHashes hashes every static file, for asset URLs and ETags.
+func assetHashes(fsys fs.FS) map[string]string {
+	out := map[string]string{}
+	_ = fs.WalkDir(fsys, ".", func(p string, d fs.DirEntry, err error) error {
+		if err != nil || d.IsDir() {
+			return nil
+		}
+		if data, err := fs.ReadFile(fsys, p); err == nil {
+			sum := sha256.Sum256(data)
+			out[p] = hex.EncodeToString(sum[:8])
+		}
+		return nil
+	})
+	return out
+}
+
+// staticHandler serves the embedded assets. Pages ask for them by URLs that
+// carry the content hash (?v=): such a file never changes and is kept for a
+// year, by the browser and by a proxy in front such as Cloudflare. Asked for
+// without it, a file is checked every time against its ETag.
+func staticHandler(fsys fs.FS, hashes map[string]string) http.Handler {
+	files := http.FileServer(http.FS(fsys))
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		h := hashes[strings.TrimPrefix(r.URL.Path, "/")]
+		if h != "" {
+			w.Header().Set("ETag", `"`+h+`"`)
+		}
+		if v := r.URL.Query().Get("v"); h != "" && v == h {
+			w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+		} else {
+			w.Header().Set("Cache-Control", "no-cache")
+		}
+		files.ServeHTTP(w, r)
+	})
+}

internal/server/ship.go

@@ -0,0 +1,418 @@
+package server
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// Sending a file or folder to another machine. The sending agent packs it as
+// a tar stream; to another agent the stream goes in pieces through a relay
+// here, a few pieces held at most, and the receiving agent unpacks it as it
+// comes. To an SSH host the sending agent writes it there itself. The panel
+// follows a job: how far the sender is, and the result.
+
+// relay carries one stream between two agents, in numbered pieces.
+type relay struct {
+	id, from, to string
+
+	mu      sync.Mutex
+	changed chan struct{}
+	chunks  map[int][]byte
+	low     int // pieces below it were taken
+	end     int // the last piece's number, -1 until it came
+	err     string
+}
+
+func (x *relay) notify() {
+	close(x.changed)
+	x.changed = make(chan struct{})
+}
+
+// await waits until ready() holds and returns true with x.mu held.
+func (x *relay) await(ctx context.Context, d time.Duration, ready func() bool) bool {
+	t := time.NewTimer(d)
+	defer t.Stop()
+	for {
+		x.mu.Lock()
+		if ready() {
+			return true
+		}
+		ch := x.changed
+		x.mu.Unlock()
+		select {
+		case <-ch:
+		case <-t.C:
+			return false
+		case <-ctx.Done():
+			return false
+		}
+	}
+}
+
+func (x *relay) fail(msg string) {
+	x.mu.Lock()
+	if x.err == "" {
+		x.err = msg
+		x.chunks = nil
+		x.notify()
+	}
+	x.mu.Unlock()
+}
+
+type shipJob struct {
+	id      string
+	mu      sync.Mutex
+	changed chan struct{}
+	ver     int
+	prog    proto.ShipProgress
+	done    bool
+	res     proto.TaskResult
+	cancel  context.CancelFunc
+	stopped bool
+}
+
+func (j *shipJob) update(fn func()) {
+	j.mu.Lock()
+	fn()
+	j.ver++
+	close(j.changed)
+	j.changed = make(chan struct{})
+	j.mu.Unlock()
+}
+
+type shipping struct {
+	mu     sync.Mutex
+	relays map[string]*relay
+	jobs   map[string]*shipJob
+}
+
+func (c *shipping) relay(id string) *relay {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.relays[id]
+}
+
+func (c *shipping) job(id string) *shipJob {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.jobs[id]
+}
+
+// shipReq is what the panel asks for: Src on this agent to Dir/Name on agent
+// To, or on the SSH host.
+type shipReq struct {
+	Src      string           `json:"src"`
+	Name     string           `json:"name"`
+	Dir      string           `json:"dir"`
+	Conflict string           `json:"conflict"`
+	Move     bool             `json:"move"`
+	To       string           `json:"to"`
+	SSH      *proto.SSHTarget `json:"ssh"`
+}
+
+// POST /api/panel/agents/{id}/fs/ship - start sending; the answer names the
+// job to follow.
+func (s *Server) handleFSShip(w http.ResponseWriter, r *http.Request) {
+	from := r.PathValue("id")
+	var q shipReq
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&q); err != nil {
+		writeJSON(w, proto.TaskResult{Error: "bad request"})
+		return
+	}
+	q.Name, q.Dir = strings.TrimSpace(q.Name), strings.TrimSpace(q.Dir)
+	if q.Src == "" || q.Name == "" || strings.Contains(q.Name, "/") || q.Dir == "" {
+		writeJSON(w, proto.TaskResult{Error: "не указано, что и куда"})
+		return
+	}
+	if !s.fsAgent(w, from, true) {
+		return
+	}
+	where := ""
+	if q.SSH != nil {
+		t := q.SSH
+		t.Host, t.User = strings.TrimSpace(t.Host), strings.TrimSpace(t.User)
+		if t.Port == 0 {
+			t.Port = 22
+		}
+		if t.Host == "" || t.User == "" || t.Port < 1 || t.Port > 65535 {
+			writeJSON(w, proto.TaskResult{Error: "нужны хост, порт и пользователь"})
+			return
+		}
+		where = "ssh:" + t.User + "@" + t.Host + ":" + strconv.Itoa(t.Port)
+	} else {
+		if q.To == "" {
+			writeJSON(w, proto.TaskResult{Error: "не выбрана машина"})
+			return
+		}
+		if !s.db.CanUseAgent(s.currentAdmin(r), q.To) {
+			writeJSON(w, proto.TaskResult{Error: "нет доступа к той машине"})
+			return
+		}
+		if !s.fsAgent(w, q.To, true) {
+			return
+		}
+		where = "agent:" + q.To
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), xferTimeout)
+	j := &shipJob{id: randToken()[:24], changed: make(chan struct{}), cancel: cancel}
+	s.ship.mu.Lock()
+	if s.ship.jobs == nil {
+		s.ship.jobs, s.ship.relays = map[string]*shipJob{}, map[string]*relay{}
+	}
+	s.ship.jobs[j.id] = j
+	s.ship.mu.Unlock()
+	if admin := s.currentAdmin(r); admin != nil {
+		op := "copy"
+		if q.Move {
+			op = "move"
+		}
+		s.db.Audit(admin.ID, from, "fs.ship."+op+":"+q.Src+" -> "+where+":"+strings.TrimSuffix(q.Dir, "/")+"/"+q.Name)
+	}
+	go s.runShip(ctx, j, from, q)
+	data, _ := json.Marshal(map[string]string{"job": j.id})
+	writeJSON(w, proto.TaskResult{OK: true, Data: data})
+}
+
+func (s *Server) runShip(ctx context.Context, j *shipJob, from string, q shipReq) {
+	defer j.cancel()
+	res := s.ship1(ctx, j, from, q)
+	if !res.OK && j.stopped {
+		res.Error = "отменено"
+	}
+	j.update(func() { j.done, j.res = true, res })
+	// The result waits a while for the panel to come for it.
+	time.AfterFunc(xferIdle, func() {
+		s.ship.mu.Lock()
+		delete(s.ship.jobs, j.id)
+		s.ship.mu.Unlock()
+	})
+}
+
+func oldAgent(res proto.TaskResult) proto.TaskResult {
+	if unknownOp(res) {
+		res.Error = "агент не умеет отправлять на другие машины - обновите его"
+	}
+	return res
+}
+
+func (s *Server) ship1(ctx context.Context, j *shipJob, from string, q shipReq) proto.TaskResult {
+	args := proto.FSShipArgs{Src: q.Src, Name: q.Name, Dir: q.Dir, Conflict: q.Conflict, Job: j.id}
+	if q.SSH != nil {
+		args.SSH, args.Move = q.SSH, q.Move
+		res, err := s.waitTask(ctx, from, proto.TaskFSShipOut, args, xferTimeout)
+		if err != nil {
+			return proto.TaskResult{Error: err.Error()}
+		}
+		return oldAgent(res)
+	}
+
+	x := &relay{id: randToken()[:24], from: from, to: q.To, changed: make(chan struct{}), chunks: map[int][]byte{}, end: -1}
+	s.ship.mu.Lock()
+	s.ship.relays[x.id] = x
+	s.ship.mu.Unlock()
+	defer func() {
+		s.ship.mu.Lock()
+		delete(s.ship.relays, x.id)
+		s.ship.mu.Unlock()
+	}()
+	go func() { <-ctx.Done(); x.fail("отменено") }()
+	args.Relay, args.Chunk = x.id, xferChunk
+
+	var in proto.TaskResult
+	inDone := make(chan struct{})
+	go func() {
+		defer close(inDone)
+		res, err := s.waitTask(ctx, q.To, proto.TaskFSShipIn, args, xferTimeout)
+		if err != nil {
+			res = proto.TaskResult{Error: err.Error()}
+		}
+		in = oldAgent(res)
+		if !in.OK {
+			x.fail(in.Error)
+		}
+	}()
+	out, err := s.waitTask(ctx, from, proto.TaskFSShipOut, args, xferTimeout)
+	if err != nil {
+		out = proto.TaskResult{Error: err.Error()}
+	}
+	out = oldAgent(out)
+	if !out.OK {
+		x.fail(out.Error)
+	}
+	<-inDone
+	if !in.OK {
+		return proto.TaskResult{Error: "на той машине: " + in.Error}
+	}
+	if !out.OK {
+		return out
+	}
+	if q.Move {
+		res, err := s.waitTask(ctx, from, proto.TaskFSDelTree, proto.FSPathArgs{Path: q.Src}, fsTaskTimeout)
+		if err == nil && !res.OK {
+			err = errText(res.Error)
+		}
+		if err != nil {
+			return proto.TaskResult{Error: "отправлено, но здесь не удалилось: " + err.Error()}
+		}
+	}
+	// The receiver's count: what it put down and what it kept as it was.
+	return in
+}
+
+type errText string
+
+func (e errText) Error() string { return string(e) }
+
+// GET /api/panel/fs/job/{jid}?v=N - the job's state once it differs from
+// version N, or after a while anyway.
+func (s *Server) handleShipJob(w http.ResponseWriter, r *http.Request) {
+	j := s.ship.job(r.PathValue("jid"))
+	if j == nil {
+		writeJSON(w, map[string]any{"done": true, "result": proto.TaskResult{Error: "задание не найдено"}})
+		return
+	}
+	seen, _ := strconv.Atoi(r.URL.Query().Get("v"))
+	t := time.NewTimer(25 * time.Second)
+	defer t.Stop()
+	for {
+		j.mu.Lock()
+		if j.ver != seen || j.done {
+			out := map[string]any{"v": j.ver, "progress": j.prog, "done": j.done}
+			if j.done {
+				out["result"] = j.res
+			}
+			j.mu.Unlock()
+			writeJSON(w, out)
+			return
+		}
+		ch := j.changed
+		j.mu.Unlock()
+		select {
+		case <-ch:
+		case <-t.C:
+			seen = -1 // answer with what there is
+		case <-r.Context().Done():
+			return
+		}
+	}
+}
+
+// POST /api/panel/fs/job/{jid}/cancel
+func (s *Server) handleShipCancel(w http.ResponseWriter, r *http.Request) {
+	if j := s.ship.job(r.PathValue("jid")); j != nil {
+		j.update(func() { j.stopped = true })
+		j.cancel()
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// POST /api/agent/fs/job/{jid}/progress - the sender's progress. 410: the
+// job is over or cancelled, stop.
+func (s *Server) handleShipProgress(w http.ResponseWriter, r *http.Request) {
+	if s.authenticateAgent(r) == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	j := s.ship.job(r.PathValue("jid"))
+	var p proto.ShipProgress
+	if j == nil || json.NewDecoder(http.MaxBytesReader(w, r.Body, 4096)).Decode(&p) != nil {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	stop := false
+	j.update(func() { j.prog, stop = p, j.stopped || j.done })
+	if stop {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// POST /api/agent/fs/relay/{rid}/{i} - piece i of the stream from the
+// sender, X-Last on the last. 503: no room yet, again; 410: it is over.
+func (s *Server) handleRelayPost(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	x := s.ship.relay(r.PathValue("rid"))
+	i, err := strconv.Atoi(r.PathValue("i"))
+	if x == nil || x.from != a.ID || err != nil || i < 0 {
+		http.Error(w, "передача не найдена", http.StatusGone)
+		return
+	}
+	data, err := readPiece(w, r)
+	if err != nil {
+		http.Error(w, "кусок не дошёл", http.StatusBadRequest)
+		return
+	}
+	if !x.await(r.Context(), xferWait, func() bool { return x.err != "" || i < x.low+xferBuffer }) {
+		http.Error(w, "нет места, повторите", http.StatusServiceUnavailable)
+		return
+	}
+	defer x.mu.Unlock()
+	if x.err != "" {
+		http.Error(w, x.err, http.StatusGone)
+		return
+	}
+	if i >= x.low && x.chunks[i] == nil {
+		x.chunks[i] = data
+		if r.Header.Get("X-Last") != "" {
+			x.end = i
+		}
+		x.notify()
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
+
+// GET /api/agent/fs/relay/{rid}/{i} - piece i for the receiver, X-Last on
+// the last. Asking for i says every piece below it is written, so those are
+// let go. 503: not here yet, ask again; 410: it is over.
+func (s *Server) handleRelayGet(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	x := s.ship.relay(r.PathValue("rid"))
+	i, err := strconv.Atoi(r.PathValue("i"))
+	if x == nil || x.to != a.ID || err != nil || i < 0 {
+		http.Error(w, "передача не найдена", http.StatusGone)
+		return
+	}
+	x.mu.Lock()
+	if i > x.low {
+		for k := x.low; k < i; k++ {
+			delete(x.chunks, k)
+		}
+		x.low = i
+		x.notify()
+	}
+	x.mu.Unlock()
+	if !x.await(r.Context(), xferWait, func() bool { return x.err != "" || x.chunks[i] != nil }) {
+		http.Error(w, "кусок ещё не пришёл", http.StatusServiceUnavailable)
+		return
+	}
+	if x.err != "" {
+		msg := x.err
+		x.mu.Unlock()
+		http.Error(w, msg, http.StatusGone)
+		return
+	}
+	data, last := x.chunks[i], i == x.end
+	x.mu.Unlock()
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("Content-Length", strconv.Itoa(len(data)))
+	if last {
+		w.Header().Set("X-Last", "1")
+	}
+	_, _ = w.Write(data)
+}

internal/server/users.go

@@ -0,0 +1,89 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+)
+
+// GET /api/panel/users/{id}/agents - every machine, and which of them the
+// user may use, for the editor of a user's machines.
+func (s *Server) handleUserAgents(w http.ResponseWriter, r *http.Request) {
+	id, _ := strconv.ParseInt(r.PathValue("id"), 10, 64)
+	u, _ := s.db.AdminByID(id)
+	if u == nil {
+		http.NotFound(w, r)
+		return
+	}
+	agents, _ := s.db.ListAgents()
+	mine := s.db.UserAgents(id)
+	type item struct {
+		ID       string `json:"id"`
+		Name     string `json:"name"`
+		Hostname string `json:"hostname"`
+		Online   bool   `json:"online"`
+		On       bool   `json:"on"`
+	}
+	out := make([]item, 0, len(agents))
+	for _, a := range agents {
+		out = append(out, item{a.ID, a.Name, a.Hostname, s.online(&a), mine[a.ID]})
+	}
+	writeJSON(w, map[string]any{"username": u.Username, "agents": out})
+}
+
+// POST /api/panel/users/{id} - change a user: the role, the machines, the
+// password sign-in, and whether they may switch it themselves. Fields left
+// out stay as they are.
+func (s *Server) handleUserEdit(w http.ResponseWriter, r *http.Request) {
+	me := s.currentAdmin(r)
+	id, _ := strconv.ParseInt(r.PathValue("id"), 10, 64)
+	u, _ := s.db.AdminByID(id)
+	if u == nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "нет такого пользователя"})
+		return
+	}
+	var in struct {
+		Role        *string   `json:"role"`
+		Agents      *[]string `json:"agents"`
+		PasswordOff *bool     `json:"password_off"`
+		PwLocked    *bool     `json:"pw_locked"`
+	}
+	if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 64<<10)).Decode(&in); err != nil {
+		writeJSON(w, map[string]any{"ok": false, "error": "плохой запрос"})
+		return
+	}
+	fail := func(msg string) { writeJSON(w, map[string]any{"ok": false, "error": msg}) }
+	if in.Role != nil {
+		role := *in.Role
+		if role != RoleAdmin && role != RoleUser {
+			fail("нет такой роли")
+			return
+		}
+		if role == RoleUser && u.IsAdmin() && s.db.CountRole(RoleAdmin) <= 1 {
+			fail("это последний администратор")
+			return
+		}
+		_ = s.db.SetUserRole(id, role)
+		s.db.Audit(me.ID, "", "user_role:"+u.Username+":"+role)
+	}
+	if in.Agents != nil {
+		_ = s.db.SetUserAgents(id, *in.Agents)
+		s.db.Audit(me.ID, "", "user_agents:"+u.Username+":"+strconv.Itoa(len(*in.Agents)))
+	}
+	if in.PasswordOff != nil {
+		if *in.PasswordOff && s.db.CountAdminKeys(id) == 0 {
+			fail("у пользователя нет ключей доступа - без пароля он не войдёт")
+			return
+		}
+		_ = s.db.SetPasswordOff(id, *in.PasswordOff)
+		action := "password_on"
+		if *in.PasswordOff {
+			action = "password_off"
+		}
+		s.db.Audit(me.ID, "", action+":"+u.Username)
+	}
+	if in.PwLocked != nil {
+		_ = s.db.SetPwLocked(id, *in.PwLocked)
+	}
+	writeJSON(w, map[string]any{"ok": true})
+}

internal/server/web/install.sh.tmpl

@@ -7,6 +7,10 @@
 set -eu
 
 HOST="${HOST:-{{.Host}}}"
+# The server's other address (the direct one, not behind a proxy like
+# Cloudflare, or the main one when this script came from the direct one): the
+# agent turns to it when HOST is out of reach.
+FALLBACK_HOST="${FALLBACK_HOST:-{{.Fallback}}}"
 {{if .Secret}}ENROLL_SECRET="${ENROLL_SECRET:-{{.Secret}}}"
 {{end}}
 BIN_PATH="/usr/local/bin/lpagent"
@@ -108,9 +112,9 @@ fi
 # --- downloader -------------------------------------------------------------
 download() { # download URL DEST
   if command -v curl >/dev/null 2>&1; then
-    curl -fSL -o "$2" "$1"
+    curl -fSL --connect-timeout 15 -o "$2" "$1"
   elif command -v wget >/dev/null 2>&1; then
-    wget -qO "$2" "$1"
+    wget -q -T 30 -O "$2" "$1"
   else
     red "Нужен curl или wget."; exit 1
   fi
@@ -118,7 +122,14 @@ download() { # download URL DEST
 
 bold "Скачивание агента ($ARCH) с $HOST…"
 TMP="$(mktemp)"
-download "$HOST/download/agent-linux-$ARCH" "$TMP"
+if ! download "$HOST/download/agent-linux-$ARCH" "$TMP"; then
+  if [ -n "$FALLBACK_HOST" ] && [ "$FALLBACK_HOST" != "$HOST" ]; then
+    bold "$HOST недоступен, скачивание с $FALLBACK_HOST…"
+    download "$FALLBACK_HOST/download/agent-linux-$ARCH" "$TMP"
+  else
+    red "Не удалось скачать агента."; exit 1
+  fi
+fi
 install -m 0755 "$TMP" "$BIN_PATH"
 rm -f "$TMP"
 green "Бинарник установлен: $BIN_PATH"
@@ -129,6 +140,7 @@ chmod 700 "$CONF_DIR"
 umask 077
 cat > "$CONF_FILE" <<EOF
 HOST=$HOST
+FALLBACK_HOST=$FALLBACK_HOST
 ENROLL_SECRET=${ENROLL_SECRET:-}
 AGENT_NAME=$AGENT_NAME
 STATE_PATH=$STATE_FILE

internal/server/web/static/account.js

@@ -0,0 +1,209 @@
+// The account button in the top bar: a dialog with who is signed in, their
+// passkeys (add one, remove one), the password switch and signing out. The
+// password can be turned off once there is a passkey to sign in with.
+(function () {
+  'use strict';
+  var btn = document.getElementById('acct');
+  if (!btn) return;
+
+  var b64u = {
+    enc: function (buf) {
+      var s = '', b = new Uint8Array(buf);
+      for (var i = 0; i < b.length; i++) s += String.fromCharCode(b[i]);
+      return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+    },
+    dec: function (str) {
+      var s = atob(str.replace(/-/g, '+').replace(/_/g, '/') + '==='.slice((str.length + 3) % 4));
+      var b = new Uint8Array(s.length);
+      for (var i = 0; i < s.length; i++) b[i] = s.charCodeAt(i);
+      return b.buffer;
+    }
+  };
+  var esc = function (s) { return String(s).replace(/[&<>"]/g, function (c) { return {'&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;'}[c]; }); };
+  var when = function (t) { return t ? new Date(t * 1000).toLocaleString() : 'ещё не использовался'; };
+  var csrf = (document.cookie.match(/(?:^|; )lpra_csrf=([^;]*)/) || [])[1] || '';
+  var X = '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M18 6 6 18M6 6l12 12"/></svg>';
+  var KEY = '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="7.5" cy="15.5" r="4.5"/><path d="m21 2-9.6 9.6M15.5 7.5l3 3L22 7l-3-3"/></svg>';
+
+  var dlg = document.createElement('dialog');
+  dlg.id = 'acctdlg';
+  dlg.tabIndex = -1;
+  dlg.innerHTML =
+    '<div class="dlg-h"><strong style="flex:1">Аккаунт</strong>' +
+    '<button type="button" class="btn ghost small icon close x" data-close title="Закрыть" aria-label="Закрыть">' + X + '</button></div>' +
+    '<div class="dlg-b acct">' +
+    '  <div class="acct-who"><span class="acct-ava"></span><div><div class="acct-name"></div><div class="muted acct-mode"></div></div></div>' +
+    '  <h3>Ключи доступа</h3>' +
+    '  <p class="muted acct-hint">Вход отпечатком, лицом, PIN-кодом устройства или аппаратным ключом. Ключей может быть несколько - например, телефон и ноутбук.</p>' +
+    '  <ul class="acct-keys"></ul>' +
+    '  <div class="acct-add"><input type="text" class="acct-keyname" maxlength="60" placeholder="название, например «телефон»">' +
+    '  <button type="button" class="acct-addbtn">Добавить ключ</button></div>' +
+    '  <p class="acct-msg"></p>' +
+    '  <label class="acct-pw"><span><b>Вход по паролю</b><small class="muted acct-pwnote"></small></span>' +
+    '  <input type="checkbox" class="sw" role="switch"></label>' +
+    '  <details class="acct-chpw"><summary>Сменить пароль</summary>' +
+    '  <form class="acct-pwform" autocomplete="on">' +
+    '  <input type="text" name="username" autocomplete="username" hidden>' +
+    '  <input type="password" name="current" placeholder="текущий пароль" autocomplete="current-password" required>' +
+    '  <input type="password" name="new" placeholder="новый пароль, от 8 символов" autocomplete="new-password" minlength="8" required>' +
+    '  <input type="password" name="again" placeholder="новый ещё раз" autocomplete="new-password" required>' +
+    '  <button type="submit">Сменить</button></form></details>' +
+    '  <details class="acct-pin"><summary>PIN-код <small class="acct-pinstate"></small></summary>' +
+    '  <form class="acct-pinform">' +
+    '  <input type="password" name="current" inputmode="numeric" maxlength="4" pattern="[0-9]{4}" placeholder="текущий PIN" autocomplete="off">' +
+    '  <input type="password" name="pin" inputmode="numeric" maxlength="4" pattern="[0-9]{4}" placeholder="новый PIN, 4 цифры" autocomplete="off">' +
+    '  <input type="password" name="again" inputmode="numeric" maxlength="4" pattern="[0-9]{4}" placeholder="новый ещё раз" autocomplete="off">' +
+    '  <div class="row"><button type="button" class="btn danger acct-pindel">Убрать PIN</button><button type="submit" class="acct-pinsave">Сохранить</button></div>' +
+    '  </form>' +
+    '  <label class="acct-pingrace"><span>На этом устройстве не спрашивать после ввода</span><select>' +
+    '  <option value="0">каждый раз</option><option value="5">5 минут</option><option value="15">15 минут</option>' +
+    '  <option value="30">30 минут</option><option value="60">60 минут</option></select></label>' +
+    '  <p class="acct-pinmsg" aria-live="polite"></p><p class="muted" style="font-size:12px;margin:8px 0 0">Спрашивается в каждой новой вкладке; при перезагрузке той же вкладки - нет.</p></details>' +
+    '  <form method="post" action="/logout" class="acct-out"><input type="hidden" name="csrf"><button type="submit" class="btn ghost">Выйти</button></form>' +
+    '</div>';
+  document.body.appendChild(dlg);
+  dlg.querySelector('.acct-out [name=csrf]').value = decodeURIComponent(csrf);
+  var $ = function (sel) { return dlg.querySelector(sel); };
+  $('[data-close]').onclick = function () { dlg.close(); };
+  var supported = !!(window.PublicKeyCredential && navigator.credentials && window.isSecureContext);
+
+  function msg(text, bad) {
+    $('.acct-msg').textContent = text || '';
+    $('.acct-msg').className = 'acct-msg' + (bad ? ' bad' : '');
+  }
+  function load() {
+    return fetch('/api/panel/account', {cache: 'no-store'}).then(function (r) { return r.json(); }).then(function (d) {
+      $('.acct-name').textContent = d.username;
+      dlg.querySelector('.acct-pwform [name=username]').value = d.username;
+      const pf = dlg.querySelector('.acct-pinform');
+      dlg.querySelector('.acct-pinstate').textContent = d.pin ? '· установлен' : '· не задан';
+      pf.current.hidden = !d.pin;
+      pf.querySelector('.acct-pindel').hidden = !d.pin;
+      pf.querySelector('.acct-pinsave').textContent = d.pin ? 'Сменить' : 'Установить';
+      $('.acct-pingrace').hidden = !d.pin;
+      try { $('.acct-pingrace select').value = localStorage.getItem('lpra.pin.grace') || '0'; } catch (e) { /* default */ }
+      $('.acct-ava').textContent = (d.username || '?').slice(0, 1).toUpperCase();
+      $('.acct-mode').textContent = d.password_off ? 'вход только по ключу доступа' : d.keys.length ? 'вход по паролю или ключу' : 'вход по паролю';
+      const sw = $('.acct-pw .sw');
+      sw.checked = !d.password_off;
+      sw.disabled = !d.keys.length || d.pw_locked;
+      $('.acct-pwnote').textContent = d.pw_locked ? 'закреплено администратором' + (d.password_off ? ': только по ключу' : '')
+        : !d.keys.length ? 'выключить можно, когда есть хотя бы один ключ'
+        : d.password_off ? 'выключен: войти можно только ключом' : 'можно выключить и входить только ключом';
+      var ul = $('.acct-keys');
+      ul.innerHTML = d.keys.length ? '' : '<li class="muted">Ключей пока нет.</li>';
+      d.keys.forEach(function (k) {
+        var li = document.createElement('li');
+        li.innerHTML = '<span class="acct-kicon">' + KEY + '</span><div class="acct-kinfo"><div>' + esc(k.name) + '</div>' +
+          '<div class="muted">добавлен ' + esc(when(k.created)) + ' · вход: ' + esc(when(k.last_used)) + '</div></div>' +
+          '<button type="button" class="btn danger small" title="Удалить ключ">Удалить</button>';
+        li.querySelector('button').onclick = function () {
+          var last = d.keys.length === 1;
+          if (!confirm('Удалить ключ «' + k.name + '»?' + (last && d.password_off ? ' Это последний ключ: вход по паролю снова включится.' : ''))) return;
+          fetch('/api/panel/account/keys/' + k.id + '/delete', {method: 'POST'}).then(function (r) { return r.json(); })
+            .then(function (r) { if (!r.ok) msg(r.error, true); else { msg('ключ удалён'); load(); } });
+        };
+        ul.appendChild(li);
+      });
+    });
+  }
+  $('.acct-addbtn').onclick = function () {
+    if (!supported) { msg('этот браузер не умеет ключи доступа, или страница открыта не по https', true); return; }
+    var add = $('.acct-addbtn');
+    add.disabled = true;
+    msg('подтвердите на устройстве…');
+    fetch('/api/panel/account/keys/begin', {method: 'POST'}).then(function (r) { return r.json(); }).then(function (r) {
+      var o = r.options;
+      o.challenge = b64u.dec(o.challenge);
+      o.user.id = b64u.dec(o.user.id);
+      o.excludeCredentials.forEach(function (c) { c.id = b64u.dec(c.id); });
+      return navigator.credentials.create({publicKey: o});
+    }).then(function (cred) {
+      return fetch('/api/panel/account/keys/finish', {
+        method: 'POST', headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify({
+          name: $('.acct-keyname').value,
+          clientDataJSON: b64u.enc(cred.response.clientDataJSON),
+          attestationObject: b64u.enc(cred.response.attestationObject)
+        })
+      }).then(function (r) { return r.json(); });
+    }).then(function (r) {
+      if (!r.ok) { msg(r.error, true); return; }
+      $('.acct-keyname').value = '';
+      msg('ключ добавлен - теперь вход по нему');
+      load();
+    }).catch(function (e) {
+      msg(e && e.name === 'NotAllowedError' ? 'отменено' : e && e.name === 'InvalidStateError' ? 'этот ключ уже добавлен' : 'не вышло: ' + (e && e.message || e), true);
+    }).then(function () { add.disabled = false; });
+  };
+  $('.acct-pwform').onsubmit = function (ev) {
+    ev.preventDefault();
+    const f = ev.target;
+    if (f.new.value !== f.again.value) { msg('новые пароли не совпадают', true); return; }
+    f.querySelector('button').disabled = true;
+    fetch('/api/panel/account/password/change', {method: 'POST', headers: {'Content-Type': 'application/json'},
+      body: JSON.stringify({current: f.current.value, new: f.new.value})})
+      .then(function (r) { return r.json(); })
+      .then(function (r) {
+        if (!r.ok) { msg(r.error, true); return; }
+        f.reset();
+        dlg.querySelector('.acct-chpw').open = false;
+        msg('пароль сменён');
+      })
+      .catch(function () { msg('ошибка сети', true); })
+      .then(function () { f.querySelector('button').disabled = false; });
+  };
+  function pinMsg(text, bad) {
+    $('.acct-pinmsg').textContent = text || '';
+    $('.acct-pinmsg').className = 'acct-pinmsg' + (bad ? ' bad' : '');
+  }
+  function savePin(pin) {
+    const f = $('.acct-pinform');
+    return fetch('/api/panel/account/pin', {method: 'POST', headers: {'Content-Type': 'application/json'},
+      body: JSON.stringify({pin: pin, current: f.current.value})})
+      .then(function (r) { return r.json(); })
+      .then(function (r) {
+        if (!r.ok) { pinMsg(r.error, true); return; }
+        f.reset();
+        // This tab stays unlocked: the PIN is for tabs opened from now on.
+        try { sessionStorage.setItem('lpra.pin.ok', '1'); } catch (e) { /* asked next load */ }
+        pinMsg(pin ? 'PIN сохранён' : 'PIN убран');
+        load();
+      })
+      .catch(function () { pinMsg('ошибка сети', true); });
+  }
+  $('.acct-pinform').onsubmit = function (ev) {
+    ev.preventDefault();
+    const f = ev.target;
+    if (!/^[0-9]{4}$/.test(f.pin.value)) { pinMsg('PIN - ровно 4 цифры', true); return; }
+    if (f.pin.value !== f.again.value) { pinMsg('новые PIN не совпадают', true); return; }
+    savePin(f.pin.value);
+  };
+  $('.acct-pingrace select').onchange = function (ev) {
+    const min = Number(ev.target.value);
+    try {
+      localStorage.setItem('lpra.pin.grace', String(min));
+      // Counted from now, as the PIN was entered to get here.
+      localStorage.setItem('lpra.pin.until', min ? String(Date.now() + min * 60000) : '0');
+    } catch (e) { pinMsg('браузер не даёт сохранить настройку', true); return; }
+    pinMsg(min ? 'на этом устройстве PIN не спросят ' + min + ' мин после ввода' : 'PIN спрашивается в каждой новой вкладке');
+  };
+  $('.acct-pindel').onclick = function () {
+    if (confirm('Убрать PIN-код?')) savePin('');
+  };
+  $('.acct-pw .sw').onchange = function (ev) {
+    const off = !ev.target.checked;
+    if (off && !confirm('Выключить вход по паролю? Войти можно будет только ключом доступа. Если ключи потеряются, их сможет сбросить другой администратор в «Настройках».')) {
+      ev.target.checked = true;
+      return;
+    }
+    fetch('/api/panel/account/password', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({off: off})})
+      .then(function (r) { return r.json(); })
+      .then(function (r) { if (!r.ok) msg(r.error, true); else msg(off ? 'вход по паролю выключен' : 'вход по паролю включён'); load(); });
+  };
+  btn.onclick = function () {
+    msg('');
+    pinMsg('');
+    load().then(function () { dlg.showModal(); dlg.focus(); });
+  };
+})();

internal/server/web/static/app.css

@@ -25,6 +25,13 @@ header.topbar {
   padding: 14px 24px; border-bottom: 1px solid var(--border); background: var(--panel);
 }
 header.topbar .brand { font-weight: 600; }
+header.topbar .brand a.home { color: inherit; text-decoration: none; transition: color .15s; }
+header.topbar .brand a.home:hover { color: var(--accent); }
+/* A long machine name gives way: the links and the status stay in sight. */
+@media (min-width: 641px) {
+  header.topbar .brand { flex: 1 1 auto; min-width: 0; margin-right: 16px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  header.topbar nav { flex: none; white-space: nowrap; }
+}
 header.topbar nav a { margin-left: 18px; color: var(--muted); }
 header.topbar nav a:hover { color: var(--text); }
 .wrap { max-width: 960px; margin: 0 auto; padding: 24px 16px; }
@@ -62,6 +69,12 @@ button, .btn {
 button:hover, .btn:hover { background: var(--accent-hover); text-decoration: none; }
 .btn.ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
 .btn.danger { background: var(--danger); }
+/* Close buttons: red text and border on the ghost button. */
+.btn.close, .btn.ghost.close { background: transparent; border: 1px solid rgba(255, 92, 92, .6); color: var(--danger); }
+.btn.close:hover, .btn.ghost.close:hover { background: #3a1d1d; border-color: var(--danger); }
+/* A close button that is just a cross: square, the height of the buttons by it. */
+.btn.close.x { width: 32px; height: 32px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }
+.btn.small.close.x { width: 28px; height: 28px; }
 .btn.small { padding: 6px 10px; font-size: 13px; }
 .btn.icon { width: 30px; height: 30px; padding: 0; display: inline-flex;
   align-items: center; justify-content: center; font-size: 14px; line-height: 1; text-decoration: none; }
@@ -96,6 +109,112 @@ pre { padding: 12px; overflow-x: auto; font-size: 13px; white-space: pre-wrap; w
 .row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
 .spacer { flex: 1; }
 #terminal { width: 100%; height: calc(100vh - 150px); }
+/* The PIN lock of a new tab: the page stays hidden until it is unlocked. */
+html.pin-wait body > :not(.pinlock) { visibility: hidden; }
+.pinlock { position: fixed; inset: 0; z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 16px;
+  background: rgba(10, 13, 17, .92); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
+  opacity: 0; transition: opacity .3s ease; }
+.pinlock.on { opacity: 1; }
+.pinlock.done { opacity: 0; pointer-events: none; }
+.pin-card { width: 100%; max-width: 300px; display: flex; flex-direction: column; align-items: center; text-align: center;
+  transform: translateY(8px) scale(.98); transition: transform .3s ease; }
+.pinlock.on .pin-card { transform: none; }
+.pinlock.done .pin-card { transform: scale(1.03); }
+.pin-ico { width: 54px; height: 54px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
+  background: #12202f; border: 1px solid var(--border); color: var(--accent); }
+.pin-title { margin: 14px 0 18px; font-size: 18px; font-weight: 600; }
+.pin-dots { display: flex; gap: 16px; }
+.pin-dots i { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--muted); transition: background .15s, border-color .15s, transform .15s; }
+.pin-dots i.on { background: var(--accent); border-color: var(--accent); transform: scale(1.1); }
+.pin-card.bad .pin-dots i.on { background: var(--danger); border-color: var(--danger); }
+.pin-card.bad .pin-dots { animation: pin-shake .38s ease; }
+@keyframes pin-shake { 20% { transform: translateX(-9px); } 40% { transform: translateX(8px); } 60% { transform: translateX(-5px); } 80% { transform: translateX(3px); } }
+.pin-msg { min-height: 20px; margin: 14px 0 6px; font-size: 13px; color: var(--danger); }
+.pin-pad { display: grid; grid-template-columns: repeat(3, 72px); gap: 14px; justify-content: center; }
+.pin-pad button { width: 72px; height: 72px; border-radius: 50%; padding: 0; display: inline-flex; align-items: center; justify-content: center;
+  background: #151a21; border: 1px solid var(--border); color: var(--text); font-size: 26px; font-weight: 400;
+  -webkit-tap-highlight-color: transparent; touch-action: manipulation; transition: background .12s, transform .08s; }
+.pin-pad button:hover { background: #1b222c; }
+.pin-pad button:active { background: #12202f; transform: scale(.94); }
+.pin-pad button[data-k="back"], .pin-pad button[data-k="out"] { background: transparent; border-color: transparent; color: #c26a6a; }
+.pin-pad button[data-k="out"] { font-size: 15px; font-weight: 500; }
+.pin-pad button[data-k="back"]:hover, .pin-pad button[data-k="out"]:hover { background: rgba(194, 106, 106, .1); }
+.pin-pad button[data-k="back"]:active, .pin-pad button[data-k="out"]:active { background: rgba(194, 106, 106, .18); }
+@media (max-height: 560px) { .pin-pad { grid-template-columns: repeat(3, 58px); gap: 10px; } .pin-pad button { width: 58px; height: 58px; font-size: 22px; } .pin-pad button[data-k="out"] { font-size: 13px; } }
+
+/* Dialogs shared by the pages. */
+dialog { background: var(--panel); color: var(--text); border: 1px solid var(--border);
+  border-radius: 12px; padding: 0; max-width: 900px; width: 92vw; }
+dialog::backdrop { background: rgba(0, 0, 0, .6); }
+dialog:focus { outline: none; }
+/* Dialogs come and go smoothly: rise and fade in, sink and fade out, the
+   backdrop with them. Browsers without the exit transition just close. */
+dialog { opacity: 0; transform: translateY(10px) scale(.97);
+  transition: opacity .2s ease, transform .2s ease, overlay .2s ease allow-discrete, display .2s ease allow-discrete; }
+dialog[open] { opacity: 1; transform: none; }
+dialog::backdrop { opacity: 0; transition: opacity .2s ease, overlay .2s ease allow-discrete, display .2s ease allow-discrete; }
+dialog[open]::backdrop { opacity: 1; }
+@starting-style {
+  dialog[open] { opacity: 0; transform: translateY(10px) scale(.97); }
+  dialog[open]::backdrop { opacity: 0; }
+}
+@media (prefers-reduced-motion: reduce) { dialog, dialog::backdrop { transition: none; } }
+.dlg-h { padding: 14px 18px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 10px; }
+.dlg-b { padding: 16px 18px; }
+/* The account button in the top bar, and its dialog. */
+header.topbar nav .acct-btn { margin-left: 22px; width: 34px; height: 34px; padding: 0; vertical-align: middle; }
+#acctdlg { max-width: 480px; }
+.acct-who { display: flex; align-items: center; gap: 12px; }
+.acct-ava { width: 40px; height: 40px; border-radius: 50%; background: #12202f; border: 1px solid var(--border);
+  display: inline-flex; align-items: center; justify-content: center; font-weight: 600; color: var(--accent); flex: none; }
+.acct-name { font-weight: 600; }
+.acct-mode { font-size: 13px; }
+.acct h3 { font-size: 15px; margin: 18px 0 4px; }
+.acct-hint { font-size: 13px; margin: 0 0 10px; }
+.acct-keys { list-style: none; margin: 0; padding: 0; }
+.acct-keys li { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
+.acct-keys li .muted { font-size: 12px; }
+.acct-kicon { color: var(--accent); display: inline-flex; flex: none; }
+.acct-kinfo { flex: 1; min-width: 0; overflow-wrap: anywhere; }
+.acct-add { display: flex; gap: 8px; margin-top: 12px; }
+.acct-add input { flex: 1; min-width: 0; }
+.acct-add button { flex: none; }
+.acct-msg { min-height: 20px; margin: 8px 0 0; font-size: 13px; color: var(--ok); }
+.acct-msg.bad { color: var(--danger); }
+.acct-pw { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 14px 0 0; padding-top: 12px;
+  border-top: 1px solid var(--border); color: var(--text); font-size: 14px; cursor: pointer; }
+.acct-pw b { display: block; font-weight: 500; }
+.acct-pw small { display: block; font-size: 12px; margin-top: 2px; }
+/* A switch: a checkbox drawn as a sliding knob. */
+input.sw { -webkit-appearance: none; appearance: none; flex: none; width: 40px; height: 22px; margin: 0; border-radius: 11px;
+  background: var(--border); position: relative; cursor: pointer; transition: background .2s; }
+input.sw::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%;
+  background: #fff; transition: transform .2s; }
+input.sw:checked { background: var(--accent); }
+input.sw:checked::after { transform: translateX(18px); }
+input.sw:disabled { opacity: .45; cursor: not-allowed; }
+.acct-chpw { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
+.acct-chpw summary { cursor: pointer; font-size: 14px; color: var(--text); }
+.acct-pwform { display: grid; gap: 8px; margin-top: 10px; }
+.acct-pwform button { justify-self: end; }
+.acct-pin { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
+.acct-pin summary { cursor: pointer; font-size: 14px; color: var(--text); }
+.acct-pin small { color: var(--muted); font-size: 12px; }
+.acct-pinform { display: grid; gap: 8px; margin-top: 10px; }
+.acct-pinform input:not(:placeholder-shown) { letter-spacing: .4em; font-family: ui-monospace, Menlo, monospace; }
+.acct-pinform .row { justify-content: flex-end; }
+.acct-pingrace { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 12px; font-size: 13px; color: var(--muted); }
+.acct-pingrace[hidden] { display: none; }
+.acct-pingrace select { width: auto; flex: none; }
+.acct-pinmsg { margin: 8px 0 0; font-size: 13px; color: var(--ok, #3fb950); min-height: 0; }
+.acct-pinmsg.bad { color: var(--danger); }
+.acct-out { margin-top: 10px; padding-top: 14px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; }
+/* Sign-in page. */
+.or { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 13px; margin: 18px 0 4px; }
+.or::before, .or::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
+.or + .keybtn { margin-top: 10px; }
+.keybtn { width: 100%; display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
+
 /* Phones. A table marked .stack turns each row into a block of
    "label: value" lines, the labels coming from data-l on the cells; a cell
    marked .lead goes first, as the row's title. */
@@ -106,6 +225,9 @@ pre { padding: 12px; overflow-x: auto; font-size: 13px; white-space: pre-wrap; w
     overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
   header.topbar nav::-webkit-scrollbar { display: none; }
   header.topbar nav > * { margin-left: 0 !important; flex: none; }
+  .acct-add { flex-wrap: wrap; }
+  .acct-add button { width: 100%; }
+  .acct-keys li { flex-wrap: wrap; }
   .wrap { padding: 16px 12px; }
   .card { padding: 16px; border-radius: 8px; }
   h1 { font-size: 20px; }
@@ -124,3 +246,16 @@ pre { padding: 12px; overflow-x: auto; font-size: 13px; white-space: pre-wrap; w
   table.stack td.actions { width: auto; padding-top: 8px; justify-content: flex-start; }
   table.stack td:empty { display: none; }
 }
+
+/* Scrollbars as on a Mac: thin, no track, seen only while scrolling or with
+   the pointer at the edge, then fading out (scroll.js sets --sb from 0 to 1).
+   Nothing to scroll, nothing shown. */
+* { --sb: 0; }
+::-webkit-scrollbar { width: 8px; height: 8px; background: transparent; }
+::-webkit-scrollbar-track, ::-webkit-scrollbar-corner { background: transparent; }
+::-webkit-scrollbar-thumb { border-radius: 4px; border: 2px solid transparent; background-clip: padding-box;
+  background-color: rgba(62, 68, 78, calc(var(--sb) * .9)); }
+::-webkit-scrollbar-thumb:hover { background-color: rgba(80, 87, 98, calc(var(--sb) * .95)); }
+@supports not selector(::-webkit-scrollbar) {
+  * { scrollbar-width: thin; scrollbar-color: rgba(62, 68, 78, calc(var(--sb) * .9)) transparent; }
+}

internal/server/web/static/codemirror/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (C) 2017 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

internal/server/web/static/codemirror/codemirror.css

@@ -0,0 +1 @@
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internal/server/web/static/codemirror/codemirror.js

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internal/server/web/static/dbedit.js

@@ -0,0 +1,326 @@
+// SQLite editor of the file manager: the agent opens the database and runs
+// the queries, so a database in use keeps its locks. Tables and views in
+// tabs, rows a page at a time; a click on a value edits it (Enter saves,
+// Esc cancels, Shift+Enter a new line, the ∅ button makes it NULL). Rows are
+// added and deleted, and a tab runs any SQL.
+(function () {
+  'use strict';
+  var PAGE = 200;
+  var esc = function (s) { return String(s).replace(/[&<>"]/g, function (c) { return {'&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;'}[c]; }); };
+
+  function cellHTML(c) {
+    if (c.t === 'n') return '<i class="dbx-null">NULL</i>';
+    if (c.t === 'b') return '<i class="dbx-null">BLOB ' + esc(c.v) + ' Б</i>';
+    var v = c.v || '';
+    return esc(v.length > 300 ? v.slice(0, 300) + '…' : v);
+  }
+  // The type a typed value goes as: what the value was, or what the column
+  // is declared as, when the text fits it.
+  function typeFor(text, was, decl) {
+    var d = (decl || '').toUpperCase();
+    var int = /^\s*-?\d+\s*$/.test(text), num = text.trim() !== '' && isFinite(Number(text));
+    if (was === 'i' || (was !== 's' && /INT/.test(d))) return int ? 'i' : num ? 'r' : 's';
+    if (was === 'r' || (was !== 's' && /REAL|FLOA|DOUB|NUM|DEC/.test(d))) return num ? 'r' : 's';
+    return 's';
+  }
+
+  function open(box, path, call, toast) {
+    var S = {tables: [], cur: null, offset: 0, data: null, sel: new Set()};
+    box.innerHTML =
+      '<div class="dbx">' +
+      '<div class="dbx-tabs" role="tablist"></div>' +
+      '<div class="dbx-tools">' +
+      '  <span class="muted dbx-info"></span>' +
+      '  <span class="dbx-pager"><button type="button" class="btn ghost small icon dbx-prev" title="Назад" aria-label="Назад">‹</button>' +
+      '  <span class="muted dbx-range"></span><button type="button" class="btn ghost small icon dbx-next" title="Дальше" aria-label="Дальше">›</button></span>' +
+      '  <span class="dbx-sp"></span>' +
+      '  <button type="button" class="btn ghost small dbx-add">+ Строка</button>' +
+      '  <button type="button" class="btn danger small dbx-del" disabled>Удалить</button>' +
+      '</div>' +
+      '<div class="dbx-grid"></div>' +
+      '<div class="dbx-sql" hidden>' +
+      '  <textarea class="dbx-q" spellcheck="false" placeholder="SELECT * FROM … - Ctrl+Enter выполнить"></textarea>' +
+      '  <div class="dbx-sqlbar"><button type="button" class="dbx-run">Выполнить</button><span class="muted dbx-sqlmsg"></span></div>' +
+      '  <div class="dbx-sqlres"></div>' +
+      '</div>' +
+      '</div>';
+    var $ = function (s) { return box.querySelector(s); };
+
+    function busy(on) { box.querySelector('.dbx').classList.toggle('busy', on); }
+    function req(op, args) {
+      args.path = path;
+      busy(true);
+      return call(op, args).then(function (r) { busy(false); return r; }, function (e) { busy(false); throw e; });
+    }
+
+    function tabs() {
+      var t = $('.dbx-tabs');
+      t.innerHTML = '';
+      S.tables.forEach(function (x) {
+        var b = document.createElement('button');
+        b.type = 'button';
+        b.textContent = x.name;
+        if (x.type === 'view') b.title = 'представление - только чтение';
+        b.className = x.name === S.cur ? 'on' : '';
+        b.onclick = function () { show(x.name, 0); };
+        t.appendChild(b);
+      });
+      var q = document.createElement('button');
+      q.type = 'button';
+      q.textContent = 'SQL';
+      q.className = 'dbx-sqltab' + (S.cur === null ? ' on' : '');
+      q.onclick = sqlTab;
+      t.appendChild(q);
+    }
+
+    function show(name, offset) {
+      S.cur = name; S.offset = offset; S.sel.clear();
+      tabs();
+      $('.dbx-sql').hidden = true;
+      $('.dbx-grid').hidden = false;
+      $('.dbx-tools').hidden = false;
+      return req('db.rows', {table: name, offset: offset, limit: PAGE}).then(function (r) {
+        if (!r.ok) { $('.dbx-grid').innerHTML = '<p class="dv-note">' + esc(r.error || 'ошибка') + '</p>'; return; }
+        S.data = r.data;
+        draw();
+      });
+    }
+
+    function draw() {
+      var d = S.data, t = d.table, editable = !!t.key;
+      // An INTEGER PRIMARY KEY column already shows the rowid.
+      var showRowid = t.key === 'rowid' && !t.alias;
+      $('.dbx-info').textContent = d.total + ' ' + plural(d.total) + (t.type === 'view' ? ' · представление' : !editable ? ' · только чтение' : '');
+      $('.dbx-range').textContent = d.rows.length ? (d.offset + 1) + '–' + (d.offset + d.rows.length) : '';
+      $('.dbx-prev').disabled = d.offset <= 0;
+      $('.dbx-next').disabled = d.offset + d.rows.length >= d.total;
+      $('.dbx-pager').hidden = d.total <= PAGE;
+      $('.dbx-add').hidden = t.type !== 'table';
+      $('.dbx-del').hidden = !editable;
+      selInfo();
+      var h = '<table class="dbx-t"><thead><tr>' + (editable ? '<th class="dbx-ck"><input type="checkbox" class="dbx-all" aria-label="Выбрать все"></th>' : '') +
+        (showRowid ? '<th class="dbx-k">rowid</th>' : '');
+      t.columns.forEach(function (c) {
+        h += '<th title="' + esc(c.type + (c.pk ? ' · ключ' : '') + (c.notnull ? ' · NOT NULL' : '')) + '">' + esc(c.name) +
+          (c.type ? '<small>' + esc(c.type.toLowerCase()) + '</small>' : '') + '</th>';
+      });
+      h += '</tr></thead><tbody>';
+      d.rows.forEach(function (row, i) {
+        h += '<tr data-i="' + i + '">' + (editable ? '<td class="dbx-ck"><input type="checkbox" aria-label="Выбрать строку"></td>' : '') +
+          (showRowid ? '<td class="dbx-k">' + esc(row.k) + '</td>' : '');
+        row.v.forEach(function (c, j) {
+          h += '<td data-j="' + j + '" class="' + (c.t === 'i' || c.t === 'r' ? 'num' : '') + (editable && c.t !== 'b' ? ' ed' : '') + '">' + cellHTML(c) + '</td>';
+        });
+        h += '</tr>';
+      });
+      h += '</tbody></table>';
+      if (!d.rows.length) h += '<p class="dv-note">строк нет</p>';
+      $('.dbx-grid').innerHTML = h;
+      $('.dbx-grid').scrollTop = 0;
+      fixWidths($('.dbx-grid table'));
+    }
+    // The columns keep the widths they first came out at, so a value being
+    // edited does not move the table about.
+    function fixWidths(table) {
+      if (!table) return;
+      var ths = table.querySelectorAll('thead th'), ws = [], sum = 0;
+      ths.forEach(function (th) { var w = Math.ceil(th.getBoundingClientRect().width); ws.push(w); sum += w; });
+      ths.forEach(function (th, i) { th.style.width = ws[i] + 'px'; });
+      table.style.width = sum + 'px';
+      table.style.tableLayout = 'fixed';
+    }
+    function plural(n) {
+      var m10 = n % 10, m100 = n % 100;
+      return m10 === 1 && m100 !== 11 ? 'строка' : m10 >= 2 && m10 <= 4 && (m100 < 12 || m100 > 14) ? 'строки' : 'строк';
+    }
+    function selInfo() {
+      var b = $('.dbx-del');
+      b.disabled = !S.sel.size;
+      b.textContent = S.sel.size ? 'Удалить (' + S.sel.size + ')' : 'Удалить';
+    }
+
+    $('.dbx-prev').onclick = function () { show(S.cur, Math.max(0, S.offset - PAGE)); };
+    $('.dbx-next').onclick = function () { show(S.cur, S.offset + PAGE); };
+
+    // ---- selecting rows ----
+    $('.dbx-grid').addEventListener('change', function (ev) {
+      var el = ev.target;
+      if (el.classList.contains('dbx-all')) {
+        box.querySelectorAll('tbody .dbx-ck input').forEach(function (c, i) { c.checked = el.checked; el.checked ? S.sel.add(i) : S.sel.delete(i); });
+      } else if (el.closest('tbody .dbx-ck')) {
+        var i = +el.closest('tr').dataset.i;
+        el.checked ? S.sel.add(i) : S.sel.delete(i);
+      }
+      selInfo();
+    });
+
+    // ---- editing a value ----
+    var editing = null;
+    $('.dbx-grid').addEventListener('click', function (ev) {
+      var td = ev.target.closest('td.ed');
+      if (!td || td.querySelector('textarea') || ev.target.closest('.dbx-edit')) return;
+      edit(td);
+    });
+    function edit(td) {
+      if (editing) finish(editing, true);
+      var i = +td.parentNode.dataset.i, j = +td.dataset.j;
+      var row = S.data.rows[i], cell = row.v[j], col = S.data.table.columns[j];
+      var hgt = td.offsetHeight;
+      td.classList.add('editing');
+      td.innerHTML = '<div class="dbx-edit"><textarea spellcheck="false"></textarea><button type="button" class="dbx-nullb" title="Сделать NULL" aria-label="Сделать NULL">∅</button></div>';
+      var ta = td.querySelector('textarea');
+      ta.value = cell.t === 'n' ? '' : cell.v;
+      ta.placeholder = cell.t === 'n' ? 'NULL' : '';
+      ta.style.height = Math.max(hgt, 30) + 'px';
+      ta.focus();
+      ta.select();
+      editing = {td: td, i: i, j: j, ta: ta, cell: cell, col: col, nul: false};
+      ta.addEventListener('keydown', function (ev) {
+        if (ev.key === 'Enter' && !ev.shiftKey) { ev.preventDefault(); finish(editing, true); }
+        else if (ev.key === 'Escape') { ev.preventDefault(); ev.stopPropagation(); finish(editing, false); }
+        else if (ev.key === 'Tab') {
+          ev.preventDefault();
+          var cur = editing, next = ev.shiftKey ? cur.td.previousElementSibling : cur.td.nextElementSibling;
+          finish(cur, true);
+          if (next && next.classList.contains('ed')) edit(next);
+        }
+      });
+      ta.addEventListener('blur', function () { setTimeout(function () { if (editing && editing.ta === ta && document.activeElement !== td.querySelector('.dbx-nullb')) finish(editing, true); }, 120); });
+      td.querySelector('.dbx-nullb').onmousedown = function (ev) { ev.preventDefault(); editing.nul = true; finish(editing, true); };
+    }
+    function finish(e, keep) {
+      if (!e || editing !== e) return;
+      editing = null;
+      var text = e.ta.value, cell = e.cell;
+      var value = e.nul ? {t: 'n'} : {t: typeFor(text, cell.t, e.col.type), v: text};
+      var same = e.nul ? cell.t === 'n' : (cell.t !== 'n' || text !== '') && text === (cell.v || '') && (cell.t === value.t || cell.t === 's' || value.t === 's');
+      if (cell.t === 'n' && !e.nul && text === '') same = true;
+      e.td.classList.remove('editing');
+      if (!keep || same) { e.td.innerHTML = cellHTML(cell); return; }
+      e.td.innerHTML = cellHTML(value);
+      e.td.classList.add('saving');
+      req('db.set', {table: S.cur, key: S.data.rows[e.i].k, column: e.col.name, value: value}).then(function (r) {
+        e.td.classList.remove('saving');
+        if (!r.ok) {
+          e.td.innerHTML = cellHTML(cell);
+          flash(e.td, 'bad');
+          toast(r.error || 'не сохранилось', true);
+          return;
+        }
+        var got = r.data.value;
+        S.data.rows[e.i].v[e.j] = got;
+        // A changed key column moves the row's key too.
+        if (r.data.key !== undefined) S.data.rows[e.i].k = r.data.key;
+        e.td.innerHTML = cellHTML(got);
+        e.td.className = (got.t === 'i' || got.t === 'r' ? 'num' : '') + ' ed';
+        flash(e.td, 'ok');
+      });
+    }
+    function flash(td, kind) {
+      td.classList.remove('flash-ok', 'flash-bad');
+      void td.offsetWidth;
+      td.classList.add('flash-' + kind);
+    }
+
+    // ---- adding and deleting rows ----
+    $('.dbx-add').onclick = function () {
+      if (box.querySelector('tr.dbx-new')) return;
+      var t = S.data.table, tbody = box.querySelector('.dbx-t tbody');
+      var tr = document.createElement('tr');
+      tr.className = 'dbx-new';
+      var h = (t.key ? '<td class="dbx-ck"></td>' : '') + (t.key === 'rowid' && !t.alias ? '<td class="dbx-k">новая</td>' : '');
+      t.columns.forEach(function (c) {
+        h += '<td><input type="text" data-c="' + esc(c.name) + '" placeholder="' + esc(c.default ? 'по умолч.: ' + c.default : c.notnull ? 'обязательно' : 'NULL') + '"></td>';
+      });
+      tr.innerHTML = h;
+      tbody.insertBefore(tr, tbody.firstChild);
+      var bar = document.createElement('tr');
+      bar.className = 'dbx-newbar';
+      bar.innerHTML = '<td colspan="' + (t.columns.length + 2) + '"><button type="button" class="small dbx-addok">Добавить</button> <button type="button" class="btn ghost small dbx-addno">Отмена</button> <span class="muted">пустое поле - значение по умолчанию</span></td>';
+      tbody.insertBefore(bar, tr.nextSibling);
+      $('.dbx-grid').scrollTop = 0;
+      tr.querySelector('input').focus();
+      var done = function () { tr.remove(); bar.remove(); };
+      bar.querySelector('.dbx-addno').onclick = done;
+      var add = function () {
+        var values = {};
+        tr.querySelectorAll('input').forEach(function (inp) {
+          if (inp.value === '') return;
+          var c = t.columns.filter(function (x) { return x.name === inp.dataset.c; })[0];
+          values[c.name] = {t: typeFor(inp.value, '', c.type), v: inp.value};
+        });
+        req('db.add', {table: S.cur, values: values}).then(function (r) {
+          if (!r.ok) { toast(r.error || 'не добавилось', true); return; }
+          toast('строка добавлена');
+          var total = S.data.total + 1;
+          show(S.cur, Math.floor((total - 1) / PAGE) * PAGE);
+        });
+      };
+      bar.querySelector('.dbx-addok').onclick = add;
+      tr.addEventListener('keydown', function (ev) {
+        if (ev.key === 'Enter') { ev.preventDefault(); add(); }
+        if (ev.key === 'Escape') { ev.preventDefault(); ev.stopPropagation(); done(); }
+      });
+    };
+    $('.dbx-del').onclick = function () {
+      var keys = [];
+      S.sel.forEach(function (i) { keys.push(S.data.rows[i].k); });
+      if (!keys.length || !confirm('Удалить строк: ' + keys.length + '?')) return;
+      req('db.del', {table: S.cur, keys: keys}).then(function (r) {
+        if (!r.ok) { toast(r.error || 'не удалилось', true); return; }
+        toast('удалено строк: ' + r.data.deleted);
+        show(S.cur, S.offset);
+      });
+    };
+
+    // ---- SQL ----
+    function sqlTab() {
+      S.cur = null;
+      tabs();
+      $('.dbx-grid').hidden = true;
+      $('.dbx-tools').hidden = true;
+      $('.dbx-sql').hidden = false;
+      $('.dbx-q').focus();
+    }
+    function run() {
+      var q = $('.dbx-q').value;
+      if (!q.trim()) return;
+      $('.dbx-sqlmsg').textContent = '';
+      req('db.sql', {sql: q}).then(function (r) {
+        var out = $('.dbx-sqlres');
+        if (!r.ok) { out.innerHTML = ''; $('.dbx-sqlmsg').textContent = r.error || 'ошибка'; $('.dbx-sqlmsg').className = 'dbx-sqlmsg bad'; return; }
+        $('.dbx-sqlmsg').className = 'muted dbx-sqlmsg';
+        var d = r.data;
+        if (d.columns) {
+          $('.dbx-sqlmsg').textContent = 'строк: ' + d.rows.length + (d.more ? ' (показаны первые 500)' : '');
+          var h = '<table class="dbx-t"><thead><tr>' + d.columns.map(function (c) { return '<th>' + esc(c) + '</th>'; }).join('') + '</tr></thead><tbody>';
+          d.rows.forEach(function (row) {
+            h += '<tr>' + row.map(function (c) { return '<td class="' + (c.t === 'i' || c.t === 'r' ? 'num' : '') + '">' + cellHTML(c) + '</td>'; }).join('') + '</tr>';
+          });
+          out.innerHTML = h + '</tbody></table>';
+        } else {
+          out.innerHTML = '';
+          $('.dbx-sqlmsg').textContent = 'готово · изменено строк: ' + d.changed;
+          loadTables(true);
+        }
+      });
+    }
+    $('.dbx-run').onclick = run;
+    $('.dbx-q').addEventListener('keydown', function (ev) {
+      if (ev.key === 'Enter' && (ev.ctrlKey || ev.metaKey)) { ev.preventDefault(); run(); }
+    });
+
+    function loadTables(keep) {
+      return req('db.tables', {}).then(function (r) {
+        if (!r.ok) return r;
+        S.tables = r.data.tables;
+        if (keep) { tabs(); return r; }
+        if (S.tables.length) show(S.tables[0].name, 0); else sqlTab();
+        return r;
+      });
+    }
+    return loadTables(false);
+  }
+
+  window.DBEdit = {open: open};
+})();

internal/server/web/static/docview.js

@@ -0,0 +1,528 @@
+// Light previews of office files for the file manager, with no libraries:
+// docx, xlsx and ods are zip archives of XML, opened with the browser's own
+// DecompressionStream; csv and tsv are parsed here; an old binary .doc only
+// gives up its text. Each turns into plain HTML the page styles itself.
+(function () {
+  'use strict';
+
+  const esc = s => String(s).replace(/[&<>"]/g, c => ({'&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;'}[c]));
+
+  // ---------- zip ----------
+  // Reads the central directory; a file is inflated only when asked for.
+  function openZip(buf) {
+    const b = buf instanceof Uint8Array ? buf : new Uint8Array(buf);
+    const dv = new DataView(b.buffer, b.byteOffset, b.byteLength);
+    let eocd = -1;
+    for (let i = b.length - 22; i >= Math.max(0, b.length - 65557); i--) {
+      if (dv.getUint32(i, true) === 0x06054b50) { eocd = i; break; }
+    }
+    if (eocd < 0) throw new Error('не zip-архив');
+    const count = dv.getUint16(eocd + 10, true);
+    let p = dv.getUint32(eocd + 16, true);
+    const files = new Map();
+    const dec = new TextDecoder();
+    for (let n = 0; n < count && dv.getUint32(p, true) === 0x02014b50; n++) {
+      const method = dv.getUint16(p + 10, true), size = dv.getUint32(p + 20, true);
+      const nameLen = dv.getUint16(p + 28, true), extra = dv.getUint16(p + 30, true), comment = dv.getUint16(p + 32, true);
+      const local = dv.getUint32(p + 42, true);
+      files.set(dec.decode(b.subarray(p + 46, p + 46 + nameLen)), {method, size, local});
+      p += 46 + nameLen + extra + comment;
+    }
+    async function bytes(name) {
+      const f = files.get(name);
+      if (!f) return null;
+      const start = f.local + 30 + dv.getUint16(f.local + 26, true) + dv.getUint16(f.local + 28, true);
+      const raw = b.subarray(start, start + f.size);
+      if (f.method === 0) return raw;
+      if (f.method !== 8) throw new Error('сжатие zip, которое браузер не знает');
+      const out = new Blob([raw]).stream().pipeThrough(new DecompressionStream('deflate-raw'));
+      return new Uint8Array(await new Response(out).arrayBuffer());
+    }
+    async function xml(name) {
+      const raw = await bytes(name);
+      return raw ? new DOMParser().parseFromString(new TextDecoder().decode(raw), 'application/xml') : null;
+    }
+    return {files, bytes, xml};
+  }
+
+  // Children of an element by local name, whatever the namespace prefix.
+  const kids = (el, name) => el ? Array.from(el.children).filter(c => c.localName === name) : [];
+  const kid = (el, name) => kids(el, name)[0] || null;
+  const attr = (el, name) => {
+    if (!el) return null;
+    for (const a of el.attributes) if (a.localName === name) return a.value;
+    return null;
+  };
+
+  // ---------- docx ----------
+  async function docx(buf) {
+    const z = openZip(buf);
+    const doc = await z.xml('word/document.xml');
+    if (!doc) throw new Error('в архиве нет word/document.xml');
+    // Style ids to names, to know headings whatever the language of Word.
+    const styles = {};
+    const st = await z.xml('word/styles.xml');
+    if (st) for (const s of st.getElementsByTagNameNS('*', 'style')) {
+      styles[attr(s, 'styleId')] = (attr(kid(s, 'name'), 'val') || '').toLowerCase();
+    }
+    const body = doc.getElementsByTagNameNS('*', 'body')[0];
+    return '<div class="dv-doc">' + blocks(body, styles) + '</div>';
+  }
+  function blocks(el, styles) {
+    let html = '', list = false;
+    for (const c of el ? el.children : []) {
+      if (c.localName === 'p') {
+        const pPr = kid(c, 'pPr');
+        const isList = !!kid(pPr, 'numPr');
+        if (isList && !list) { html += '<ul>'; list = true; }
+        if (!isList && list) { html += '</ul>'; list = false; }
+        html += para(c, pPr, styles, isList);
+      } else {
+        if (list) { html += '</ul>'; list = false; }
+        if (c.localName === 'tbl') html += table(c, styles);
+        else if (c.localName === 'sdt') html += blocks(kid(c, 'sdtContent'), styles);
+      }
+    }
+    return html + (list ? '</ul>' : '');
+  }
+  function para(p, pPr, styles, isList) {
+    const name = styles[attr(kid(pPr, 'pStyle'), 'val')] || '';
+    const h = /^heading (\d)/.exec(name);
+    const tag = isList ? 'li' : name === 'title' ? 'h1' : h ? 'h' + Math.min(6, +h[1] + 1) : 'p';
+    const jc = attr(kid(pPr, 'jc'), 'val');
+    const align = jc === 'center' ? 'center' : (jc === 'right' || jc === 'end') ? 'right' : (jc === 'both' ? 'justify' : '');
+    const inner = runs(p);
+    return '<' + tag + (align ? ' style="text-align:' + align + '"' : '') + '>' + (inner || '&nbsp;') + '</' + tag + '>';
+  }
+  function runs(el) {
+    let html = '';
+    for (const c of el.children) {
+      if (c.localName === 'r') html += run(c);
+      else if (c.localName === 'hyperlink' || c.localName === 'smartTag' || c.localName === 'ins' || c.localName === 'sdt' || c.localName === 'sdtContent' || c.localName === 'fldSimple') {
+        const inner = runs(c);
+        html += c.localName === 'hyperlink' ? '<u class="dv-link">' + inner + '</u>' : inner;
+      }
+    }
+    return html;
+  }
+  function run(r) {
+    const pr = kid(r, 'rPr');
+    const on = n => { const e = kid(pr, n); return !!e && attr(e, 'val') !== '0' && attr(e, 'val') !== 'false'; };
+    let t = '';
+    for (const c of r.children) {
+      if (c.localName === 't') t += esc(c.textContent);
+      else if (c.localName === 'tab') t += '&emsp;';
+      else if (c.localName === 'br' || c.localName === 'cr') t += '<br>';
+    }
+    if (!t) return '';
+    if (on('b')) t = '<b>' + t + '</b>';
+    if (on('i')) t = '<i>' + t + '</i>';
+    if (kid(pr, 'u') && attr(kid(pr, 'u'), 'val') !== 'none') t = '<u>' + t + '</u>';
+    if (on('strike')) t = '<s>' + t + '</s>';
+    // A size set on the run itself, as many documents do instead of styles.
+    const sz = +attr(kid(pr, 'sz'), 'val');
+    if (sz && sz !== 24) t = '<span style="font-size:' + Math.max(9, Math.min(36, sz / 2)) + 'pt">' + t + '</span>';
+    const va = attr(kid(pr, 'vertAlign'), 'val');
+    if (va === 'superscript') t = '<sup>' + t + '</sup>';
+    else if (va === 'subscript') t = '<sub>' + t + '</sub>';
+    return t;
+  }
+  function table(tbl, styles) {
+    let html = '<div class="dv-scroll"><table class="dv-table">';
+    for (const tr of kids(tbl, 'tr')) {
+      html += '<tr>';
+      for (const tc of kids(tr, 'tc')) {
+        const span = attr(kid(kid(tc, 'tcPr'), 'gridSpan'), 'val');
+        html += '<td' + (span > 1 ? ' colspan="' + span + '"' : '') + '>' + blocks(tc, styles) + '</td>';
+      }
+      html += '</tr>';
+    }
+    return html + '</table></div>';
+  }
+
+  // ---------- tables: one grid per sheet ----------
+  const MAX_ROWS = 2000, MAX_COLS = 60;
+  function colName(i) { let s = ''; for (i++; i > 0; i = Math.floor((i - 1) / 26)) s = String.fromCharCode(65 + (i - 1) % 26) + s; return s; }
+  function grid(rows, names) {
+    let cols = names ? names.length : 0;
+    for (const r of rows) cols = Math.max(cols, r.length);
+    cols = Math.min(cols, MAX_COLS);
+    const cut = rows.length > MAX_ROWS || rows.some(r => r.length > MAX_COLS);
+    let html = '<div class="dv-scroll dv-grid"><table class="dv-sheet"><thead><tr><th></th>';
+    for (let c = 0; c < cols; c++) html += '<th>' + esc(names && names[c] != null ? names[c] : colName(c)) + '</th>';
+    html += '</tr></thead><tbody>';
+    rows.slice(0, MAX_ROWS).forEach((r, i) => {
+      html += '<tr><th>' + (i + 1) + '</th>';
+      for (let c = 0; c < cols; c++) {
+        const v = r[c] == null ? '' : r[c];
+        html += '<td' + (typeof v === 'number' ? ' class="n"' : '') + '>' + esc(v) + '</td>';
+      }
+      html += '</tr>';
+    });
+    html += '</tbody></table></div>';
+    return {html, cut};
+  }
+  // Several sheets: tabs over the grid.
+  function sheets(list) {
+    if (!list.length) return '<p class="dv-note">в книге нет листов</p>';
+    let html = '';
+    if (list.length > 1) {
+      html += '<div class="dv-tabs">' + list.map((s, i) => '<button type="button" data-sheet="' + i + '"' + (i ? '' : ' class="on"') + '>' + esc(s.name) + '</button>').join('') + '</div>';
+    }
+    list.forEach((s, i) => {
+      const g = grid(s.rows, s.cols);
+      html += '<div class="dv-pane" data-pane="' + i + '"' + (i ? ' hidden' : '') + '>' + (s.note ? '<p class="dv-note">' + esc(s.note) + '</p>' : '') + g.html +
+        (g.cut ? '<p class="dv-note">показаны первые ' + MAX_ROWS + ' строк и ' + MAX_COLS + ' столбцов</p>' : '') + '</div>';
+    });
+    return html;
+  }
+  function bindTabs(root) {
+    root.querySelectorAll('[data-sheet]').forEach(b => b.onclick = () => {
+      root.querySelectorAll('[data-sheet]').forEach(x => x.classList.toggle('on', x === b));
+      root.querySelectorAll('[data-pane]').forEach(p => p.hidden = p.dataset.pane !== b.dataset.sheet);
+    });
+  }
+
+  // ---------- xlsx ----------
+  async function xlsx(buf) {
+    const z = openZip(buf);
+    const wb = await z.xml('xl/workbook.xml');
+    if (!wb) throw new Error('в архиве нет xl/workbook.xml');
+    const rels = {};
+    const rx = await z.xml('xl/_rels/workbook.xml.rels');
+    if (rx) for (const r of rx.getElementsByTagNameNS('*', 'Relationship')) rels[r.getAttribute('Id')] = r.getAttribute('Target');
+    const shared = [];
+    const ss = await z.xml('xl/sharedStrings.xml');
+    if (ss) for (const si of ss.getElementsByTagNameNS('*', 'si')) {
+      shared.push(Array.from(si.getElementsByTagNameNS('*', 't')).filter(t => t.parentElement.localName !== 'rPh').map(t => t.textContent).join(''));
+    }
+    const list = [];
+    for (const s of wb.getElementsByTagNameNS('*', 'sheet')) {
+      let target = rels[attr(s, 'id')] || '';
+      target = target.startsWith('/') ? target.slice(1) : 'xl/' + target.replace(/^\.\//, '');
+      const doc = await z.xml(target);
+      list.push({name: s.getAttribute('name') || '?', rows: doc ? xlsxRows(doc, shared) : []});
+    }
+    return sheets(list);
+  }
+  function xlsxRows(doc, shared) {
+    const rows = [];
+    for (const row of doc.getElementsByTagNameNS('*', 'row')) {
+      const ri = (+row.getAttribute('r') || rows.length + 1) - 1;
+      if (ri >= MAX_ROWS) break;
+      const out = rows[ri] = rows[ri] || [];
+      let next = 0;
+      for (const c of kids(row, 'c')) {
+        const ref = /^([A-Z]+)/.exec(c.getAttribute('r') || '');
+        let ci = next;
+        if (ref) { ci = 0; for (const ch of ref[1]) ci = ci * 26 + ch.charCodeAt(0) - 64; ci--; }
+        next = ci + 1;
+        if (ci >= MAX_COLS + 1) continue;
+        const t = c.getAttribute('t'), v = kid(c, 'v');
+        let val = v ? v.textContent : '';
+        if (t === 's') val = shared[+val] || '';
+        else if (t === 'inlineStr') val = Array.from(c.getElementsByTagNameNS('*', 't')).map(x => x.textContent).join('');
+        else if (t === 'b') val = val === '1' ? 'TRUE' : 'FALSE';
+        else if (t !== 'str' && t !== 'e' && val !== '' && !isNaN(val)) val = +val;
+        out[ci] = val;
+      }
+    }
+    for (let i = 0; i < rows.length; i++) rows[i] = rows[i] || [];
+    return rows;
+  }
+
+  // ---------- ods / odt ----------
+  async function ods(buf) {
+    const z = openZip(buf);
+    const doc = await z.xml('content.xml');
+    if (!doc) throw new Error('в архиве нет content.xml');
+    const list = [];
+    for (const t of doc.getElementsByTagNameNS('*', 'table')) {
+      if (t.parentElement && t.parentElement.localName === 'table-cell') continue;
+      const rows = [];
+      for (const r of t.getElementsByTagNameNS('*', 'table-row')) {
+        const cells = [];
+        for (const c of r.children) {
+          if (c.localName !== 'table-cell' && c.localName !== 'covered-table-cell') continue;
+          const rep = Math.min(+attr(c, 'number-columns-repeated') || 1, MAX_COLS + 1 - cells.length);
+          const num = attr(c, 'value');
+          const text = Array.from(c.getElementsByTagNameNS('*', 'p')).map(p => p.textContent).join('\n');
+          const val = attr(c, 'value-type') === 'float' && num != null ? +num : text;
+          for (let i = 0; i < rep; i++) cells.push(val);
+          if (cells.length > MAX_COLS) break;
+        }
+        while (cells.length && cells[cells.length - 1] === '') cells.pop();
+        const rep = Math.min(+attr(r, 'number-rows-repeated') || 1, MAX_ROWS + 1 - rows.length);
+        for (let i = 0; i < rep; i++) rows.push(cells);
+        if (rows.length > MAX_ROWS) break;
+      }
+      while (rows.length && !rows[rows.length - 1].length) rows.pop();
+      list.push({name: attr(t, 'name') || '?', rows});
+    }
+    return sheets(list);
+  }
+  async function odt(buf) {
+    const z = openZip(buf);
+    const doc = await z.xml('content.xml');
+    const body = doc && doc.getElementsByTagNameNS('*', 'text')[0];
+    if (!body) throw new Error('в архиве нет текста');
+    // Runs of spaces, tabs and breaks are elements of their own in ODF.
+    const inline = el => {
+      let html = '';
+      for (const n of el.childNodes) {
+        if (n.nodeType === 3) html += esc(n.nodeValue);
+        else if (n.localName === 's') html += ' '.repeat(+attr(n, 'c') || 1);
+        else if (n.localName === 'tab') html += '&emsp;';
+        else if (n.localName === 'line-break') html += '<br>';
+        else if (n.nodeType === 1) html += inline(n);
+      }
+      return html;
+    };
+    const walk = el => {
+      let html = '';
+      for (const c of el.children) {
+        if (c.localName === 'h') { const l = Math.min(6, (+attr(c, 'outline-level') || 1) + 1); html += '<h' + l + '>' + inline(c) + '</h' + l + '>'; }
+        else if (c.localName === 'p') html += '<p>' + (inline(c) || '&nbsp;') + '</p>';
+        else if (c.localName === 'list') html += '<ul>' + kids(c, 'list-item').map(li => '<li>' + walk(li) + '</li>').join('') + '</ul>';
+        else if (c.localName === 'table') html += '<div class="dv-scroll"><table class="dv-table">' + Array.from(c.getElementsByTagNameNS('*', 'table-row')).map(r =>
+          '<tr>' + kids(r, 'table-cell').map(td => '<td>' + walk(td) + '</td>').join('') + '</tr>').join('') + '</table></div>';
+        else if (c.localName === 'section') html += walk(c);
+      }
+      return html;
+    };
+    return '<div class="dv-doc">' + walk(body) + '</div>';
+  }
+
+  // ---------- csv / tsv ----------
+  function csv(text, tab) {
+    const first = text.slice(0, text.indexOf('\n') >>> 0 || text.length);
+    const sep = tab ? '\t' : (first.split(';').length > first.split(',').length ? ';' : ',');
+    const rows = [];
+    let row = [], f = '', q = false;
+    for (let i = 0; i < text.length; i++) {
+      const c = text[i];
+      if (q) {
+        if (c === '"') { if (text[i + 1] === '"') { f += '"'; i++; } else q = false; }
+        else f += c;
+      } else if (c === '"' && f === '') q = true;
+      else if (c === sep) { row.push(f); f = ''; }
+      else if (c === '\n' || c === '\r') {
+        if (c === '\r' && text[i + 1] === '\n') i++;
+        row.push(f); f = ''; rows.push(row); row = [];
+        if (rows.length > MAX_ROWS) break;
+      } else f += c;
+    }
+    if (f !== '' || row.length) { row.push(f); rows.push(row); }
+    return sheets([{name: '', rows: rows.map(r => r.map(v => v !== '' && !isNaN(v) && /^-?[\d.]+$/.test(v.trim()) ? +v : v))}]);
+  }
+
+  // ---------- old .doc ----------
+  // Word 97-2003 is a binary format; without a full parser all that can be
+  // shown is the text, picked out of the document's WordDocument stream as
+  // the runs that read as words.
+  function cfbStream(b, want) {
+    const dv = new DataView(b.buffer, b.byteOffset, b.byteLength);
+    if (dv.getUint32(0, true) !== 0xE011CFD0) return null;
+    const ss = 1 << dv.getUint16(0x1E, true);
+    const sector = n => 512 + n * ss;
+    const fat = [];
+    const addFat = n => { const o = sector(n); for (let i = 0; i < ss / 4; i++) fat.push(dv.getUint32(o + i * 4, true)); };
+    for (let i = 0; i < 109; i++) { const n = dv.getUint32(0x4C + i * 4, true); if (n < 0xFFFFFFFA) addFat(n); }
+    for (let n = dv.getUint32(0x44, true), k = 0; n < 0xFFFFFFFA && k < 1000; k++) {
+      const o = sector(n);
+      for (let i = 0; i < ss / 4 - 1; i++) { const m = dv.getUint32(o + i * 4, true); if (m < 0xFFFFFFFA) addFat(m); }
+      n = dv.getUint32(o + ss - 4, true);
+    }
+    const chain = (start, size) => {
+      const out = new Uint8Array(size);
+      let n = start, at = 0;
+      for (let guard = 0; n < 0xFFFFFFFA && at < size && guard < 1e6; guard++) {
+        const o = sector(n), len = Math.min(ss, size - at);
+        if (o + len > b.length) break;
+        out.set(b.subarray(o, o + len), at);
+        at += len;
+        n = fat[n];
+      }
+      return out.subarray(0, at);
+    };
+    const dirStart = dv.getUint32(0x30, true);
+    const dir = chain(dirStart, ss * 64);
+    const dd = new DataView(dir.buffer, dir.byteOffset, dir.byteLength);
+    for (let o = 0; o + 128 <= dir.length; o += 128) {
+      const nameLen = dd.getUint16(o + 0x40, true);
+      let name = '';
+      for (let i = 0; i + 2 < nameLen; i += 2) name += String.fromCharCode(dd.getUint16(o + i, true));
+      if (name === want && dd.getUint8(o + 0x42) === 2) return chain(dd.getUint32(o + 0x74, true), dd.getUint32(o + 0x78, true));
+    }
+    return null;
+  }
+  function doc(buf) {
+    const all = new Uint8Array(buf);
+    const b = cfbStream(all, 'WordDocument') || all;
+    const ok = c => c === 9 || c === 10 || c === 13 || (c >= 32 && c < 127) || (c >= 0xA0 && c <= 0x24F) || (c >= 0x400 && c <= 0x4FF) || (c >= 0x2010 && c <= 0x2026) || c === 0x2116;
+    const pieces = [];
+    let cur = '';
+    const flush = min => {
+      const letters = (cur.match(/[A-Za-zА-Яа-яЁё0-9]/g) || []).length;
+      if (cur.trim().length >= min && letters >= cur.trim().length * 0.5) pieces.push(cur);
+      cur = '';
+    };
+    for (let i = 0; i + 1 < b.length; i += 2) {
+      const c = b[i] | (b[i + 1] << 8);
+      if (ok(c)) cur += String.fromCharCode(c); else flush(3);
+    }
+    flush(4);
+    let text = pieces.join('\n');
+    if (text.length < 40) { // a document that keeps its text 8-bit
+      const p8 = [];
+      for (let i = 0; i < b.length; i++) {
+        const c = b[i];
+        if (c === 9 || c === 10 || c === 13 || (c >= 32 && c < 127)) cur += String.fromCharCode(c);
+        else { if (cur.trim().length >= 8 && (cur.match(/[A-Za-z]/g) || []).length >= cur.length * 0.5) p8.push(cur); cur = ''; }
+      }
+      text = p8.join('\n');
+    }
+    if (!text.trim()) throw new Error('текст не нашёлся');
+    return '<p class="dv-note">старый формат .doc: показан только текст, без оформления</p><div class="dv-doc">' +
+      text.split(/\r\n|\r|\n|\x07/).filter(l => l.trim()).map(l => '<p>' + esc(l) + '</p>').join('') + '</div>';
+  }
+
+  // ---------- sqlite ----------
+  // Reads the database file itself: the b-tree of sqlite_master for the
+  // tables, then each table's b-tree for its first rows. No SQL engine.
+  function sqlite(buf) {
+    const b = new Uint8Array(buf);
+    if (new TextDecoder().decode(b.subarray(0, 15)) !== 'SQLite format 3') throw new Error('не база SQLite');
+    const dv = new DataView(b.buffer, b.byteOffset, b.byteLength);
+    let ps = dv.getUint16(16);
+    if (ps === 1) ps = 65536;
+    const usable = ps - b[20];
+    const enc = dv.getUint32(56);
+    const dec = new TextDecoder(enc === 2 ? 'utf-16le' : enc === 3 ? 'utf-16be' : 'utf-8');
+    const page = n => (n - 1) * ps;
+
+    function varint(o) {
+      let v = 0;
+      for (let i = 0; i < 9; i++) {
+        const c = b[o + i];
+        if (i === 8) return [v * 256 + c, o + 9];
+        v = v * 128 + (c & 0x7f);
+        if (!(c & 0x80)) return [v, o + i + 1];
+      }
+    }
+    // A cell's payload, gathered from its overflow pages when it spills.
+    function payload(o, size) {
+      const max = usable - 35;
+      if (size <= max) return b.subarray(o, o + size);
+      const min = Math.floor((usable - 12) * 32 / 255) - 23;
+      let local = min + (size - min) % (usable - 4);
+      if (local > max) local = min;
+      const out = new Uint8Array(size);
+      out.set(b.subarray(o, o + local));
+      let at = local, next = dv.getUint32(o + local);
+      for (let guard = 0; next && at < size && guard < 1e6; guard++) {
+        const po = page(next), len = Math.min(usable - 4, size - at);
+        out.set(b.subarray(po + 4, po + 4 + len), at);
+        at += len;
+        next = dv.getUint32(po);
+      }
+      return out;
+    }
+    function record(p) {
+      const pv = new DataView(p.buffer, p.byteOffset, p.byteLength);
+      let [hlen, o] = vi(p, 0);
+      const types = [];
+      while (o < hlen) { const r = vi(p, o); types.push(r[0]); o = r[1]; }
+      let d = hlen;
+      return types.map(t => {
+        let v = null;
+        if (t >= 1 && t <= 6) {
+          const n = [0, 1, 2, 3, 4, 6, 8][t];
+          let x = 0;
+          for (let i = 0; i < n; i++) x = x * 256 + p[d + i];
+          if (p[d] & 0x80) x -= Math.pow(2, 8 * n);
+          v = n === 8 && Math.abs(x) > Number.MAX_SAFE_INTEGER ? pv.getBigInt64(d).toString() : x;
+          d += n;
+        } else if (t === 7) { v = pv.getFloat64(d); d += 8; }
+        else if (t === 8) v = 0;
+        else if (t === 9) v = 1;
+        else if (t >= 12 && t % 2 === 0) { const n = (t - 12) / 2; v = '[blob ' + n + ' B]'; d += n; }
+        else if (t >= 13) { const n = (t - 13) / 2; v = dec.decode(p.subarray(d, d + n)); d += n; }
+        return v;
+      });
+    }
+    // varint over a payload buffer rather than the file
+    function vi(p, o) {
+      let v = 0;
+      for (let i = 0; i < 9; i++) {
+        const c = p[o + i];
+        if (i === 8) return [v * 256 + c, o + 9];
+        v = v * 128 + (c & 0x7f);
+        if (!(c & 0x80)) return [v, o + i + 1];
+      }
+    }
+    // Walks a table b-tree in rowid order, up to limit rows; also counts all.
+    function table(root, limit) {
+      const rows = [];
+      let count = 0;
+      const walk = (n, depth) => {
+        if (depth > 40) return;
+        const h = page(n) + (n === 1 ? 100 : 0);
+        const type = b[h], cells = dv.getUint16(h + 3);
+        const ptrs = h + (type === 0x05 ? 12 : 8);
+        if (type === 0x0d) {
+          count += cells;
+          for (let i = 0; i < cells && rows.length < limit; i++) {
+            let o = page(n) + dv.getUint16(ptrs + i * 2), size, rowid;
+            [size, o] = varint(o);
+            [rowid, o] = varint(o);
+            rows.push({rowid, values: record(payload(o, size))});
+          }
+        } else if (type === 0x05) {
+          for (let i = 0; i < cells; i++) walk(dv.getUint32(page(n) + dv.getUint16(ptrs + i * 2)), depth + 1);
+          walk(dv.getUint32(h + 8), depth + 1);
+        }
+      };
+      walk(root, 0);
+      return {rows, count};
+    }
+    // Column names out of CREATE TABLE; an INTEGER PRIMARY KEY is the rowid.
+    function columns(sql) {
+      const m = /\(([\s\S]*)\)/.exec(sql || '');
+      if (!m) return {names: [], rowidCol: -1};
+      const parts = [];
+      let depth = 0, cur = '';
+      for (const c of m[1]) {
+        if (c === '(') depth++;
+        if (c === ')') depth--;
+        if (c === ',' && !depth) { parts.push(cur); cur = ''; } else cur += c;
+      }
+      parts.push(cur);
+      const names = [];
+      let rowidCol = -1;
+      for (const p of parts) {
+        const t = p.trim();
+        if (!t || /^(constraint|primary\s+key|unique|check|foreign\s+key)\b/i.test(t)) continue;
+        const nm = /^("(?:[^"]|"")+"|`[^`]+`|\[[^\]]+\]|\S+)/.exec(t)[1].replace(/^["`\[]|["`\]]$/g, '');
+        if (/^\S+\s+integer\s+primary\s+key\b/i.test(t.replace(/^("(?:[^"]|"")+"|`[^`]+`|\[[^\]]+\])/, 'x'))) rowidCol = names.length;
+        names.push(nm);
+      }
+      return {names, rowidCol};
+    }
+
+    const master = table(1, 100000).rows.map(r => ({type: r.values[0], name: r.values[1], root: r.values[3], sql: r.values[4] || ''}));
+    const list = [];
+    for (const t of master.filter(x => x.type === 'table' && x.root).sort((a, c) => String(a.name).localeCompare(String(c.name)))) {
+      if (/without\s+rowid/i.test(t.sql)) { list.push({name: t.name, rows: [], note: 'таблица WITHOUT ROWID - её строки здесь не показываются'}); continue; }
+      const {names, rowidCol} = columns(t.sql);
+      let data;
+      try { data = table(t.root, MAX_ROWS); } catch (e) { list.push({name: t.name, rows: [], note: 'не удалось прочитать: ' + e.message}); continue; }
+      const rows = data.rows.map(r => { const v = r.values.slice(); if (rowidCol >= 0 && v[rowidCol] == null) v[rowidCol] = r.rowid; return v; });
+      list.push({name: t.name, cols: names, rows, note: data.count + ' ' + (data.count % 10 === 1 && data.count % 100 !== 11 ? 'строка' : data.count % 10 >= 2 && data.count % 10 <= 4 && (data.count % 100 < 12 || data.count % 100 > 14) ? 'строки' : 'строк') + (data.count > rows.length ? ', показаны первые ' + rows.length : '')});
+    }
+    if (!list.length) return '<p class="dv-note">в базе нет таблиц</p>';
+    return sheets(list);
+  }
+
+  window.DocView = {docx, xlsx, ods, odt, csv, doc, sqlite, bindTabs};
+})();

internal/server/web/static/pin.js

@@ -0,0 +1,118 @@
+// The PIN lock: in a new browser tab the panel asks for the admin's PIN
+// before showing anything. The tab remembers it was unlocked (sessionStorage
+// lives as long as the tab, through reloads, and a new tab starts empty), so
+// a reload does not ask again. Loaded in <head>, before the page shows.
+// A device can be set to trust the PIN for a while: for that many minutes
+// after it was entered, new tabs there open without asking (localStorage,
+// this browser only).
+(function () {
+  'use strict';
+  var KEY = 'lpra.pin.ok';
+  var ok = false;
+  try { ok = sessionStorage.getItem(KEY) === '1'; } catch (e) { /* no storage: ask */ }
+  if (ok) return;
+  try {
+    if (Date.now() < Number(localStorage.getItem('lpra.pin.until') || 0)) {
+      sessionStorage.setItem(KEY, '1');
+      return;
+    }
+  } catch (e) { /* ask */ }
+  var root = document.documentElement;
+  root.classList.add('pin-wait');
+  function release() { root.classList.remove('pin-wait'); }
+  function remember() { try { sessionStorage.setItem(KEY, '1'); } catch (e) { /* asked again next load */ } }
+  // After the PIN itself: no asking on this device for the minutes it trusts.
+  function trust() {
+    try {
+      var min = Number(localStorage.getItem('lpra.pin.grace') || 0);
+      if (min > 0) localStorage.setItem('lpra.pin.until', String(Date.now() + min * 60000));
+    } catch (e) { /* asks every tab */ }
+  }
+
+  fetch('/api/panel/pin', {cache: 'no-store'})
+    .then(function (r) { return r.ok ? r.json() : {pin: false}; })
+    .then(function (d) {
+      if (!d.pin) { remember(); release(); return; }
+      if (document.body) lock(); else document.addEventListener('DOMContentLoaded', lock);
+    })
+    .catch(release);
+
+  function lock() {
+    var LOCK = '<svg width="26" height="26" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="11" width="16" height="10" rx="2"/><path d="M8 11V7a4 4 0 0 1 8 0v4"/></svg>';
+    var BACK = '<svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 5H9l-6 7 6 7h12a1 1 0 0 0 1-1V6a1 1 0 0 0-1-1z"/><path d="m16 9-5 6M11 9l5 6"/></svg>';
+    var box = document.createElement('div');
+    box.className = 'pinlock';
+    box.setAttribute('role', 'dialog');
+    box.setAttribute('aria-modal', 'true');
+    box.setAttribute('aria-label', 'Ввод PIN-кода');
+    var keys = '';
+    ['1', '2', '3', '4', '5', '6', '7', '8', '9', 'out', '0', 'back'].forEach(function (k) {
+      var label = k === 'back' ? ' aria-label="Стереть">' + BACK : k === 'out' ? ' title="Выйти из панели">Выйти' : '>' + k;
+      keys += '<button type="button" data-k="' + k + '"' + label + '</button>';
+    });
+    box.innerHTML =
+      '<div class="pin-card">' +
+      '<div class="pin-ico">' + LOCK + '</div>' +
+      '<div class="pin-title">Введите PIN-код</div>' +
+      '<div class="pin-dots"><i></i><i></i><i></i><i></i></div>' +
+      '<div class="pin-msg" aria-live="polite"></div>' +
+      '<div class="pin-pad">' + keys + '</div>' +
+      '<form method="post" action="/logout" class="pin-out" hidden></form>' +
+      '</div>';
+    document.body.appendChild(box);
+    requestAnimationFrame(function () { box.classList.add('on'); });
+    var dots = box.querySelectorAll('.pin-dots i'), msg = box.querySelector('.pin-msg'), card = box.querySelector('.pin-card');
+    var code = '', busy = false;
+    function show() {
+      for (var i = 0; i < 4; i++) dots[i].classList.toggle('on', i < code.length);
+    }
+    function press(k) {
+      if (k === 'out') { box.querySelector('.pin-out').submit(); return; }
+      if (busy) return;
+      if (k === 'back') { code = code.slice(0, -1); show(); return; }
+      if (code.length >= 4) return;
+      code += k;
+      msg.textContent = '';
+      card.classList.remove('bad');
+      show();
+      if (code.length === 4) check();
+    }
+    function check() {
+      busy = true;
+      fetch('/api/panel/pin/check', {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({pin: code})})
+        .then(function (r) { return r.json(); })
+        .then(function (r) {
+          if (r.ok) {
+            remember();
+            trust();
+            box.classList.add('done');
+            release();
+            setTimeout(function () { box.remove(); }, 320);
+            document.removeEventListener('keydown', onKey, true);
+            return;
+          }
+          if (r.out) { location.href = '/login'; return; }
+          card.classList.remove('bad');
+          void card.offsetWidth; // restart the shake
+          card.classList.add('bad');
+          msg.textContent = r.error + (r.left ? ' - осталось попыток: ' + r.left : '');
+          setTimeout(function () { code = ''; show(); busy = false; }, 380);
+        })
+        .catch(function () { msg.textContent = 'нет связи с сервером'; code = ''; show(); busy = false; });
+    }
+    box.querySelector('.pin-pad').addEventListener('click', function (ev) {
+      var b = ev.target.closest('button');
+      if (b) press(b.dataset.k);
+    });
+    // Typed digits, ahead of anything on the page (the terminal included).
+    function onKey(ev) {
+      if (/^[0-9]$/.test(ev.key)) press(ev.key);
+      else if (ev.key === 'Backspace') press('back');
+      else if (ev.key !== 'Tab') return;
+      ev.preventDefault();
+      ev.stopPropagation();
+    }
+    document.addEventListener('keydown', onKey, true);
+    if (document.activeElement && document.activeElement.blur) document.activeElement.blur();
+  }
+})();

internal/server/web/static/scroll.js

@@ -0,0 +1,54 @@
+// Mac-like scrollbars: a scrolled element shows its thin scrollbar, and so
+// does one whose edge the pointer is at; after a second at rest it fades out.
+// Elements with nothing to scroll never show one. The look is in app.css.
+(function () {
+  'use strict';
+  var live = new Map(); // element -> {v: shown 0..1, until: ms to stay}
+  var raf = 0;
+  function el(t) { return t === document || t === window ? document.documentElement : t; }
+  function scrollable(e) {
+    return e.scrollHeight > e.clientHeight + 1 || e.scrollWidth > e.clientWidth + 1;
+  }
+  function show(e, ms) {
+    if (!e || !e.style || !scrollable(e)) return;
+    var s = live.get(e) || {v: 0, until: 0};
+    s.until = Math.max(s.until, performance.now() + ms);
+    live.set(e, s);
+    if (!raf) raf = setTimeout(tick, 16);
+  }
+  var last = 0;
+  // A timer, not animation frames: those stop in a tab out of sight, and the
+  // bar would stay shown.
+  function tick() {
+    var now = performance.now();
+    var dt = Math.min(64, now - (last || now - 16));
+    last = now;
+    live.forEach(function (s, e) {
+      // In fast (about 0.12 s), out slowly (about 0.4 s).
+      var want = now < s.until ? 1 : 0;
+      s.v = want ? Math.min(1, s.v + dt / 120) : Math.max(0, s.v - dt / 400);
+      e.style.setProperty('--sb', s.v.toFixed(3));
+      if (!want && s.v === 0) { e.style.removeProperty('--sb'); live.delete(e); }
+    });
+    raf = live.size ? setTimeout(tick, 16) : 0;
+    if (!raf) last = 0;
+  }
+  document.addEventListener('scroll', function (ev) { show(el(ev.target), 900); }, {capture: true, passive: true});
+  // The pointer at a scrollable element's right or bottom edge shows its bar.
+  var moved = null;
+  document.addEventListener('pointermove', function (ev) {
+    if (ev.pointerType !== 'mouse') return;
+    if (!moved) requestAnimationFrame(function () {
+      var m = moved; moved = null;
+      for (var e = m.target; e && e.nodeType === 1; e = e.parentElement) {
+        if (!scrollable(e)) continue;
+        var st = getComputedStyle(e);
+        if (!/(auto|scroll)/.test(st.overflowY + st.overflowX) && e !== document.documentElement) continue;
+        var r = e === document.documentElement ? {right: innerWidth, bottom: innerHeight} : e.getBoundingClientRect();
+        if (m.x >= r.right - 14 || m.y >= r.bottom - 14) show(e, 700);
+        break;
+      }
+    });
+    moved = {target: ev.target, x: ev.clientX, y: ev.clientY};
+  }, {passive: true});
+})();

internal/server/web/static/terminal.js

@@ -0,0 +1,858 @@
+// Terminal page: shells on one or more machines, in tabs. With one tab the
+// page is a plain terminal and a faint "+" in the corner; a second tab brings
+// the tab strip in. On a computer a tab can be dragged onto the current one
+// to share it - up to four terminals, split side by side or one above the
+// other - and a terminal dragged out of it back to the strip. Splits resize
+// by their gutters; a tab is renamed by a double click on its title.
+(function () {
+  'use strict';
+  const PAGE = window.TERM_PAGE;
+  const touch = matchMedia('(pointer: coarse)').matches;
+  const desk = !touch; // drag and drop, splits: computers only
+  if (touch) document.body.classList.add('touch');
+  const $ = id => document.getElementById(id);
+  const statusEl = $('status'), area = $('area'), tablist = $('tablist'), addBtn = $('tabadd'),
+    floatAdd = $('floatadd'), addMenu = $('addmenu'), hint = $('hint'), mark = $('tabmark');
+  const base = '/api/panel/term/';
+  const GAP = 6;
+  const X = '<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.6" stroke-linecap="round"><path d="M18 6 6 18M6 6l12 12"/></svg>';
+
+  function bytesToB64(bytes) {
+    let bin = '';
+    for (let i = 0; i < bytes.length; i++) bin += String.fromCharCode(bytes[i]);
+    return btoa(bin);
+  }
+  function b64ToBytes(b64) {
+    const bin = atob(b64), u = new Uint8Array(bin.length);
+    for (let i = 0; i < bin.length; i++) u[i] = bin.charCodeAt(i);
+    return u;
+  }
+
+  // ---------- copy and paste by keys ----------
+  // Off a Mac, where Cmd does it, Ctrl+C copies when there is a selection and
+  // interrupts as ever when there is none; Ctrl+Shift+C always copies (and is
+  // kept from the browser, whose developer tools it would open); Ctrl+V and
+  // Ctrl+Shift+V paste. Keys go by position, so a Russian layout works too.
+  const mac = /Mac|iPhone|iPad/.test(navigator.platform || navigator.userAgent);
+  function copyText(text) {
+    if (navigator.clipboard && window.isSecureContext) return navigator.clipboard.writeText(text);
+    // Plain http: the old way, through a field that is there for a moment.
+    const ta = document.createElement('textarea'), back = document.activeElement;
+    ta.value = text;
+    ta.style.cssText = 'position:fixed;top:0;left:0;opacity:0';
+    document.body.appendChild(ta);
+    ta.select();
+    const ok = document.execCommand('copy');
+    ta.remove();
+    if (back && back.focus) back.focus();
+    return ok ? Promise.resolve() : Promise.reject(new Error('нет доступа к буферу'));
+  }
+  function clipKeys(s, ev) {
+    if (mac || !ev.ctrlKey || ev.altKey || ev.metaKey) return true;
+    const c = ev.code === 'KeyC', v = ev.code === 'KeyV';
+    if (!c && !v) return true;
+    if (c && !ev.shiftKey && !s.term.hasSelection()) return true; // ^C to the shell
+    // From here the key is ours: xterm does not turn it into a control code.
+    if (ev.type === 'keydown' && c) {
+      ev.preventDefault();
+      if (s.term.hasSelection()) {
+        const text = s.term.getSelection();
+        s.term.clearSelection();
+        copyText(text).then(() => flashStatus('скопировано', 'st-ok'), e => flashStatus('не скопировалось: ' + e.message, 'st-err'));
+      }
+    }
+    // Ctrl+V: the browser's paste goes on into the terminal's text field.
+    return false;
+  }
+  function flashStatus(t, cls) {
+    statusEl.textContent = t;
+    statusEl.className = cls;
+    clearTimeout(flashStatus.t);
+    flashStatus.t = setTimeout(showStatus, 1500);
+  }
+
+  // ---------- one shell ----------
+  class Session {
+    // ssh, when given, is where the agent connects by SSH for this shell:
+    // {host, port, user} and the secret to sign in with, sent once on open.
+    constructor(agent, ssh) {
+      this.agent = agent;
+      this.ssh = ssh || null;
+      this.sid = null; this.closed = false; this.connected = false;
+      this.state = 'wait'; this.text = 'подключение…';
+      this.inSeq = 0; this.inBusy = false; this.inQueue = [];
+      this.el = document.createElement('div');
+      this.el.className = 'pane';
+      this.el.innerHTML = '<div class="pane-head"><span class="dot wait"></span><span class="pane-title"></span>' +
+        '<button type="button" class="pane-x" title="Закрыть терминал" aria-label="Закрыть терминал">' + X + '</button></div>' +
+        '<div class="pane-body"></div>';
+      this.el.querySelector('.pane-title').textContent = who(this);
+      this.el.querySelector('.pane-title').title = ssh ? 'SSH через ' + agent.name : agent.name;
+      if (ssh) this.el.querySelector('.dot').insertAdjacentHTML('afterend', '<span class="badge-ssh">SSH</span>');
+      this.term = new Terminal({
+        cursorBlink: true, fontSize: touch ? 13 : 14,
+        fontFamily: 'ui-monospace, SFMono-Regular, Menlo, monospace', theme: { background: '#0c0f13' }
+      });
+      this.fitter = new FitAddon.FitAddon();
+      this.term.loadAddon(this.fitter);
+      this.term.open(this.el.querySelector('.pane-body'));
+      this.term.attachCustomKeyEventHandler(ev => clipKeys(this, ev));
+      this.term.onData(d => this.send(TermKeys.withMods(d)));
+      this.term.onResize(() => this.queueIn({ t: 'r', cols: this.term.cols, rows: this.term.rows }));
+      this.term.onSelectionChange(() => TermKeys.selectionChanged(this));
+      this.el.addEventListener('pointerdown', () => setActivePane(this), true);
+      this.term.textarea.addEventListener('focus', () => setActivePane(this));
+      this.el.querySelector('.pane-x').onclick = ev => { ev.stopPropagation(); closePane(this); };
+      if (desk) this.el.querySelector('.pane-head').addEventListener('pointerdown', ev => startDrag(ev, 'pane', this));
+      this.open();
+    }
+    setState(state, text) {
+      this.state = state; this.text = text;
+      this.el.querySelector('.dot').className = 'dot ' + state;
+      const t = tabOf(this);
+      if (t) renderTab(t);
+      showStatus();
+    }
+    async open() {
+      try {
+        let opt = { method: 'POST' };
+        if (this.ssh) {
+          opt = { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ ssh: this.ssh }) };
+          // The password or key goes once, to the agent; the page keeps no copy.
+          this.ssh = { host: this.ssh.host, port: this.ssh.port, user: this.ssh.user };
+        }
+        const r = await fetch(base + encodeURIComponent(this.agent.id) + '/open', opt);
+        if (!r.ok) {
+          let why = 'HTTP ' + r.status;
+          try { why = (await r.json()).error || why; } catch (e) { /* plain text */ }
+          this.setState('err', 'ошибка открытия: ' + why);
+          this.term.write('\r\n\x1b[31m[не удалось открыть сессию: ' + why + ']\x1b[0m\r\n');
+          return;
+        }
+        this.sid = (await r.json()).session_id;
+        this.setState('wait', 'ожидание агента…');
+        // An agent from before SSH terminals does not answer the request.
+        if (this.ssh) setTimeout(() => {
+          if (!this.closed && !this.ended && this.text === 'ожидание агента…') {
+            this.setState('err', 'агент не начал SSH-подключение');
+            this.term.write('\x1b[33mАгент не ответил. Если он старой версии, обновите его - SSH-терминал появился в новой.\x1b[0m\r\n');
+          }
+        }, 20000);
+        this.fit();
+        // A WebSocket if it connects; the long polls otherwise, and from a
+        // dropped WebSocket on for the rest of this session.
+        if (!(await this.openWS())) this.poll();
+        this.queueIn({ t: 'r', cols: this.term.cols, rows: this.term.rows });
+      } catch (e) {
+        this.setState('err', 'ошибка сети');
+        this.term.write('\r\n\x1b[31m[ошибка сети: ' + (e && e.message ? e.message : e) + ']\x1b[0m\r\n');
+      }
+    }
+    openWS() {
+      return new Promise(resolve => {
+        if (!window.WebSocket) { resolve(false); return; }
+        const ws = new WebSocket((location.protocol === 'https:' ? 'wss://' : 'ws://') + location.host + base + this.sid + '/ws');
+        let opened = false;
+        const timer = setTimeout(() => { if (!opened) { ws.close(); resolve(false); } }, 5000);
+        ws.onopen = () => { opened = true; clearTimeout(timer); this.ws = ws; resolve(true); };
+        ws.onmessage = ev => {
+          let j;
+          try { j = JSON.parse(ev.data); } catch (e) { return; }
+          this.take(j);
+        };
+        ws.onclose = () => {
+          clearTimeout(timer);
+          if (!opened) { resolve(false); return; }
+          this.ws = null;
+          if (!this.closed && !this.ended) this.poll();
+        };
+      });
+    }
+    // take applies one answer of the output channel, either transport's.
+    take(j) {
+      if (j.closed) { this.finish('[сессия завершена]'); return false; }
+      for (const f of j.frames || []) {
+        if (f.status) this.sshStatus(f.status, f.note || '');
+        if (f.exit) { this.finish('[сессия завершена]'); return false; }
+        if (f.data) {
+          if (!this.connected && !this.ssh) { this.connected = true; this.setState('ok', 'подключено'); }
+          this.term.write(b64ToBytes(f.data));
+        }
+      }
+      return true;
+    }
+    // sshStatus shows how the agent's SSH connection goes.
+    sshStatus(st, note) {
+      if (st === 'dial') this.setState('wait', 'SSH: ' + note + '…');
+      else if (st === 'auth') this.setState('wait', 'SSH: ' + note + '…');
+      else if (st === 'ok') { this.connected = true; this.setState('ok', 'SSH: ' + note); }
+      else if (st === 'err') this.setState('err', 'SSH: ' + note);
+    }
+    async poll() {
+      while (!this.closed && this.sid) {
+        let r;
+        try { r = await fetch(base + this.sid + '/out', { cache: 'no-store' }); }
+        catch (e) { await new Promise(res => setTimeout(res, 1000)); continue; }
+        if (this.closed) return;
+        if (!r.ok) { this.finish('[соединение закрыто]'); return; }
+        if (!this.take(await r.json())) return;
+      }
+    }
+    finish(msg) {
+      if (this.ended) return;
+      this.ended = true;
+      if (this.state !== 'err') this.setState('off', 'соединение закрыто');
+      this.term.write('\r\n\x1b[33m' + msg + '\x1b[0m\r\n');
+    }
+    // Input goes out one request at a time, so on a slow link a keystroke can
+    // never overtake the one before it; a request that fails goes again under
+    // the same number, and the server drops one it already has.
+    queueIn(m) {
+      if (this.closed || !this.sid) return;
+      const q = this.inQueue, last = q[q.length - 1];
+      if (last && last.t === 'i' && m.t === 'i') last.text += m.text;
+      else if (last && last.t === 'r' && m.t === 'r') q[q.length - 1] = m;
+      else q.push(m);
+      this.pumpIn();
+    }
+    async pumpIn() {
+      if (this.inBusy || !this.inQueue.length) return;
+      this.inBusy = true;
+      while (this.inQueue.length && !this.closed) {
+        const m = this.inQueue.shift();
+        const body = m.t === 'i'
+          ? { t: 'i', d: bytesToB64(new TextEncoder().encode(m.text)), seq: ++this.inSeq }
+          : { t: 'r', cols: m.cols, rows: m.rows, seq: ++this.inSeq };
+        // On the WebSocket a message goes out in order with no answer to wait
+        // for; numbered as well, so a repeat by the long polls is dropped.
+        if (this.ws && this.ws.readyState === 1) {
+          try { this.ws.send(JSON.stringify(body)); continue; } catch (e) { /* by request below */ }
+        }
+        for (let wait = 300; !this.closed; wait = Math.min(wait * 2, 5000)) {
+          let r = null;
+          try {
+            r = await fetch(base + this.sid + '/in', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) });
+          } catch (e) { /* no answer: send it again */ }
+          if (r && r.status < 500) break;
+          await new Promise(res => setTimeout(res, wait));
+        }
+      }
+      this.inBusy = false;
+    }
+    send(data) { this.queueIn({ t: 'i', text: data }); }
+    fit() {
+      const b = this.el.querySelector('.pane-body');
+      if (b.clientWidth > 20 && b.clientHeight > 20) { try { this.fitter.fit(); } catch (e) { /* not shown yet */ } }
+    }
+    close() {
+      if (this.closed) return;
+      this.closed = true;
+      if (this.ws) { try { this.ws.close(); } catch (e) { /* closed already */ } }
+      if (this.sid) fetch(base + this.sid + '/close', { method: 'POST', keepalive: true }).catch(() => {});
+      this.term.dispose();
+      this.el.remove();
+    }
+  }
+
+  // who is what a shell is signed in as, for titles.
+  function who(s) {
+    return s.ssh ? s.ssh.user + '@' + s.ssh.host + (s.ssh.port && s.ssh.port !== 22 ? ':' + s.ssh.port : '') : s.agent.user + '@' + s.agent.host;
+  }
+
+  // ---------- tabs ----------
+  const tabs = [];
+  let active = null, activePane = null;
+  const tabOf = s => tabs.find(t => t.panes.includes(s));
+
+  function makeTab(panes, index) {
+    const t = { title: null, panes: panes, layout: panes.length === 1 ? '1' : 'h', c: 0.5, r: 0.5, gutters: [] };
+    t.view = document.createElement('div');
+    t.view.className = 'tabview';
+    area.insertBefore(t.view, hint);
+    panes.forEach(s => t.view.appendChild(s.el));
+    t.el = document.createElement('div');
+    t.el.className = 'tab enter';
+    t.el.innerHTML = '<span class="dot wait"></span><span class="tab-title"></span>' +
+      '<button type="button" class="tab-x" title="Закрыть вкладку" aria-label="Закрыть вкладку">' + X + '</button>';
+    t.el.addEventListener('click', ev => { if (!ev.target.closest('.tab-x, input') && !dragJustEnded) activate(t); });
+    t.el.querySelector('.tab-x').onclick = ev => { ev.stopPropagation(); closeTab(t); };
+    t.el.querySelector('.tab-title').addEventListener('dblclick', ev => { ev.stopPropagation(); rename(t); });
+    if (desk) t.el.addEventListener('pointerdown', ev => { if (!ev.target.closest('.tab-x, input')) startDrag(ev, 'tab', t); });
+    const at = index == null ? tabs.length : index;
+    tablist.insertBefore(t.el, tabs[at] ? tabs[at].el : mark);
+    tabs.splice(at, 0, t);
+    renderTab(t);
+    fitTabs();
+    requestAnimationFrame(() => requestAnimationFrame(() => t.el.classList.remove('enter')));
+    return t;
+  }
+  function tabTitle(t) {
+    if (t.title) return t.title;
+    const s = t.panes[0], name = s.ssh ? s.ssh.host : s.agent.name;
+    return t.panes.length > 1 ? name + ' +' + (t.panes.length - 1) : name;
+  }
+  // Tab widths: as wide as the title wants, from a comfortable minimum up to
+  // a maximum; when they do not fit, all give way evenly down to a floor,
+  // titles cut with "…", and below the floor the strip scrolls instead.
+  const ruler = document.createElement('canvas').getContext('2d');
+  const W = touch ? { min: 76, base: 124, max: 180, font: 12 } : { min: 96, base: 180, max: 300, font: 13 };
+  const CHROME = touch ? 52 : 62; // padding, dot, gaps, close button, borders
+  function fitTabs() {
+    ruler.font = W.font + 'px ' + getComputedStyle(document.body).fontFamily;
+    const live = tabs;
+    const want = live.map(t => Math.min(W.max, Math.max(W.base, Math.ceil(ruler.measureText(tabTitle(t)).width) + CHROME + (t.panes.some(p => p.ssh) ? 46 : 0))));
+    const strip = $('tabs');
+    const room = strip.clientWidth - parseFloat(getComputedStyle(strip).paddingLeft) * 2 - addBtn.offsetWidth - 4 * (live.length + 1);
+    let cap = W.max;
+    if (want.reduce((a, b) => a + b, 0) > room) {
+      // The widest give way first, to one width for all at the most.
+      let lo = W.min, hi = W.max;
+      for (let k = 0; k < 20; k++) {
+        const mid = (lo + hi) / 2;
+        if (want.reduce((a, b) => a + Math.min(b, mid), 0) > room) hi = mid; else lo = mid;
+      }
+      cap = Math.max(W.min, Math.floor(lo));
+    }
+    live.forEach((t, i) => { t.el.style.width = Math.min(want[i], cap) + 'px'; });
+  }
+  window.addEventListener('resize', () => fitTabs());
+
+  function renderTab(t) {
+    t.el.querySelector('.tab-title').textContent = tabTitle(t);
+    const ssh = t.panes.some(s => s.ssh);
+    if (ssh !== !!t.el.querySelector('.badge-ssh')) {
+      if (ssh) t.el.querySelector('.dot').insertAdjacentHTML('afterend', '<span class="badge-ssh">SSH</span>');
+      else t.el.querySelector('.badge-ssh').remove();
+    }
+    requestAnimationFrame(fitTabs);
+    t.el.title = t.panes.map(who).join(', ');
+    // The tab's dot: red if any shell failed, amber while one connects.
+    const st = t.panes.map(s => s.state);
+    t.el.querySelector('.dot').className = 'dot ' + (st.includes('err') ? 'err' : st.includes('wait') ? 'wait' : st.includes('ok') ? 'ok' : 'off');
+    t.el.classList.toggle('on', t === active);
+    t.view.classList.toggle('split', t.panes.length > 1);
+    syncFloat();
+  }
+  function activate(t) {
+    if (!t) return;
+    active = t;
+    tabs.forEach(x => { x.view.classList.toggle('on', x === t); renderTab(x); });
+    if (!t.panes.includes(activePane)) setActivePane(t.panes[0]);
+    layout(t, false);
+    t.el.scrollIntoView({ block: 'nearest', inline: 'nearest', behavior: 'smooth' });
+    if (desk && activePane) activePane.term.focus();
+    updateMode();
+  }
+  function setActivePane(s) {
+    activePane = s;
+    document.querySelectorAll('.pane.active').forEach(p => p.classList.toggle('active', p === s.el));
+    s.el.classList.add('active');
+    showStatus();
+  }
+  function showStatus() {
+    if (!activePane) { statusEl.textContent = ''; return; }
+    statusEl.textContent = activePane.text;
+    statusEl.title = activePane.text;
+    statusEl.className = activePane.state === 'ok' ? 'st-ok' : activePane.state === 'err' ? 'st-err' : 'muted';
+  }
+  // The corner "+" moves down out of the way of a split tab's title bars.
+  function syncFloat() {
+    document.body.classList.toggle('split1', tabs.length === 1 && tabs[0].panes.length > 1);
+  }
+  // One tab: a plain terminal, the strip folded into the corner "+".
+  function updateMode() {
+    syncFloat();
+    const multi = tabs.length > 1;
+    if (document.body.classList.contains('multi') === multi) return;
+    document.body.classList.toggle('multi', multi);
+    setTimeout(() => active && layout(active, false), 280);
+  }
+  function openTerminal(agent, ssh) {
+    $('empty').hidden = true;
+    const t = makeTab([new Session(agent, ssh)]);
+    activate(t);
+  }
+  function closeTab(t) {
+    const i = tabs.indexOf(t);
+    if (i < 0) return;
+    if (t.panes.length > 1 && !confirm('Закрыть вкладку с ' + t.panes.length + ' терминалами?')) return;
+    tabs.splice(i, 1);
+    t.panes.forEach(s => s.close());
+    t.el.classList.add('leave');
+    t.view.classList.remove('on');
+    setTimeout(() => { t.el.remove(); t.view.remove(); }, 220);
+    if (active === t) {
+      active = null;
+      activate(tabs[Math.min(i, tabs.length - 1)]);
+    }
+    if (!tabs.length) { activePane = null; showStatus(); $('empty').hidden = false; }
+    updateMode();
+  }
+  function rename(t) {
+    const span = t.el.querySelector('.tab-title');
+    const inp = document.createElement('input');
+    inp.className = 'tab-edit';
+    inp.value = tabTitle(t);
+    inp.size = Math.max(6, inp.value.length);
+    span.replaceWith(inp);
+    inp.focus(); inp.select();
+    let done = false;
+    const end = save => {
+      if (done) return;
+      done = true;
+      if (save) t.title = inp.value.trim() || null;
+      inp.replaceWith(span);
+      renderTab(t);
+    };
+    inp.onkeydown = ev => { if (ev.key === 'Enter') end(true); else if (ev.key === 'Escape') end(false); ev.stopPropagation(); };
+    inp.onblur = () => end(true);
+    inp.onpointerdown = ev => ev.stopPropagation();
+  }
+
+  // ---------- splits ----------
+  // Where each terminal of a tab goes, and its gutters, for a layout:
+  // 1, h (side by side), v (one above the other), top2 (two over one),
+  // bottom2 (one over two), grid (two over two). c and r are where the
+  // column and the row divide.
+  function rects(layout, c, r, W, H) {
+    const g = GAP, cw = Math.round((W - g) * c), rh = Math.round((H - g) * r);
+    const top = (y, h) => [{ x: 0, y, w: cw, h }, { x: cw + g, y, w: W - cw - g, h }];
+    const colG = (y, h) => ({ k: 'c', x: cw, y, w: g, h });
+    const rowG = { k: 'r', x: 0, y: rh, w: W, h: g };
+    const bottomY = rh + g, bottomH = H - rh - g;
+    switch (layout) {
+      case 'h': return { panes: top(0, H), gutters: [colG(0, H)] };
+      case 'v': return { panes: [{ x: 0, y: 0, w: W, h: rh }, { x: 0, y: bottomY, w: W, h: bottomH }], gutters: [rowG] };
+      case 'top2': return { panes: top(0, rh).concat([{ x: 0, y: bottomY, w: W, h: bottomH }]), gutters: [colG(0, rh), rowG] };
+      case 'bottom2': return { panes: [{ x: 0, y: 0, w: W, h: rh }].concat(top(bottomY, bottomH)), gutters: [colG(bottomY, bottomH), rowG] };
+      case 'grid': return { panes: top(0, rh).concat(top(bottomY, bottomH)), gutters: [colG(0, H), rowG] };
+      default: return { panes: [{ x: 0, y: 0, w: W, h: H }], gutters: [] };
+    }
+  }
+  function layout(t, animate) {
+    const W = t.view.clientWidth, H = t.view.clientHeight;
+    if (!W || !H) return;
+    const L = rects(t.layout, t.c, t.r, W, H);
+    t.view.classList.toggle('instant', !animate);
+    t.panes.forEach((s, i) => {
+      const p = L.panes[i];
+      s.el.style.left = p.x + 'px'; s.el.style.top = p.y + 'px';
+      s.el.style.width = p.w + 'px'; s.el.style.height = p.h + 'px';
+    });
+    while (t.gutters.length < L.gutters.length) {
+      const g = document.createElement('div');
+      g.className = 'gutter';
+      g.addEventListener('pointerdown', ev => startResize(ev, t, g));
+      t.view.appendChild(g);
+      t.gutters.push(g);
+    }
+    t.gutters.forEach((g, i) => {
+      const d = L.gutters[i];
+      g.hidden = !d;
+      if (!d) return;
+      g.className = 'gutter ' + d.k;
+      g.style.left = d.x + 'px'; g.style.top = d.y + 'px'; g.style.width = d.w + 'px'; g.style.height = d.h + 'px';
+    });
+    clearTimeout(t.fitTimer);
+    t.fitTimer = setTimeout(() => t.panes.forEach(s => s.fit()), animate ? 270 : 0);
+  }
+  function startResize(ev, t, g) {
+    ev.preventDefault();
+    g.setPointerCapture(ev.pointerId);
+    const box = t.view.getBoundingClientRect(), k = g.classList.contains('c') ? 'c' : 'r';
+    g.classList.add('drag');
+    let raf = 0;
+    const move = e => {
+      const v = k === 'c' ? (e.clientX - box.left) / box.width : (e.clientY - box.top) / box.height;
+      t[k] = Math.min(0.85, Math.max(0.15, v));
+      if (!raf) raf = requestAnimationFrame(() => { raf = 0; layout(t, false); });
+    };
+    const up = () => {
+      g.classList.remove('drag');
+      g.removeEventListener('pointermove', move);
+      g.removeEventListener('pointerup', up);
+      layout(t, false);
+    };
+    g.addEventListener('pointermove', move);
+    g.addEventListener('pointerup', up);
+  }
+  // A layout with one terminal fewer, the others keeping their places.
+  function withoutPane(layout, i) {
+    if (layout === 'h' || layout === 'v') return '1';
+    if (layout === 'top2') return i === 2 ? 'h' : 'v';
+    if (layout === 'bottom2') return i === 0 ? 'h' : 'v';
+    if (layout === 'grid') return i < 2 ? 'bottom2' : 'top2';
+    return '1';
+  }
+  function takePane(t, s) {
+    const i = t.panes.indexOf(s);
+    t.layout = withoutPane(t.layout, i);
+    t.panes.splice(i, 1);
+  }
+  function closePane(s) {
+    const t = tabOf(s);
+    if (!t) return;
+    if (t.panes.length === 1) { closeTab(t); return; }
+    takePane(t, s);
+    s.close();
+    if (activePane === s) setActivePane(t.panes[0]);
+    renderTab(t);
+    layout(t, true);
+  }
+  // Where a terminal dropped on tab t at (x, y) would go: the new layout,
+  // the order of its terminals ('P' the new one), and its place.
+  const SIDE = { left: 'слева', right: 'справа', top: 'сверху', bottom: 'снизу' };
+  function mergePlan(t, x, y) {
+    const n = t.panes.length, W = t.view.clientWidth, H = t.view.clientHeight;
+    const fx = x / W, fy = y / H;
+    let lay, order, label;
+    if (n === 1) {
+      const d = { left: fx, right: 1 - fx, top: fy, bottom: 1 - fy };
+      const k = Object.keys(d).reduce((a, b) => d[a] <= d[b] ? a : b);
+      lay = k === 'left' || k === 'right' ? 'h' : 'v';
+      order = k === 'left' || k === 'top' ? ['P', 0] : [0, 'P'];
+      label = SIDE[k];
+    } else if (n === 2 && t.layout === 'h') {
+      if (fy < 0.5) { lay = 'bottom2'; order = ['P', 0, 1]; label = 'сверху'; }
+      else { lay = 'top2'; order = [0, 1, 'P']; label = 'снизу'; }
+    } else if (n === 2) {
+      if (fy < 0.5) { lay = 'top2'; order = fx < 0.5 ? ['P', 0, 1] : [0, 'P', 1]; }
+      else { lay = 'bottom2'; order = fx < 0.5 ? [0, 'P', 1] : [0, 1, 'P']; }
+      label = (fy < 0.5 ? 'сверху ' : 'снизу ') + (fx < 0.5 ? 'слева' : 'справа');
+    } else if (n === 3) {
+      lay = 'grid';
+      if (t.layout === 'top2') { order = fx < 0.5 ? [0, 1, 'P', 2] : [0, 1, 2, 'P']; label = 'снизу ' + (fx < 0.5 ? 'слева' : 'справа'); }
+      else { order = fx < 0.5 ? ['P', 0, 1, 2] : [0, 'P', 1, 2]; label = 'сверху ' + (fx < 0.5 ? 'слева' : 'справа'); }
+    } else return null;
+    return { layout: lay, order, label, rect: rects(lay, t.c, t.r, W, H).panes[order.indexOf('P')] };
+  }
+
+  // ---------- drag and drop ----------
+  // A tab: along the strip to reorder it, or onto the current tab to join
+  // it. A terminal from a split, by its title bar: to the strip to make it a
+  // tab of its own, or onto another terminal of its tab to swap places.
+  let drag = null, dragJustEnded = false;
+  function startDrag(ev, kind, obj) {
+    if (ev.button !== 0) return;
+    drag = { kind, obj, x0: ev.clientX, y0: ev.clientY, on: false, id: ev.pointerId };
+  }
+  function beginDrag() {
+    drag.on = true;
+    const src = drag.kind === 'tab' ? drag.obj.el : drag.obj.el.querySelector('.pane-head');
+    const g = document.createElement('div');
+    g.className = 'drag-ghost ' + drag.kind;
+    g.textContent = drag.kind === 'tab' ? tabTitle(drag.obj) : drag.obj.agent.user + '@' + drag.obj.agent.host;
+    document.body.appendChild(g);
+    drag.ghost = g;
+    drag.src = src;
+    src.classList.add('dragging');
+    document.body.classList.add('dnd');
+    // Pulling a terminal out: the strip shows, one tab or not, to drop it on.
+    if (drag.kind === 'pane') document.body.classList.add('multi-hint');
+  }
+  function stripIndex(x) {
+    const others = tabs.filter(t => !(drag.kind === 'tab' && t === drag.obj));
+    let i = others.findIndex(t => { const r = t.el.getBoundingClientRect(); return x < r.left + r.width / 2; });
+    if (i < 0) i = others.length;
+    const ref = others[i] ? others[i].el.getBoundingClientRect() : (others.length ? others[others.length - 1].el.getBoundingClientRect() : null);
+    const lr = tablist.getBoundingClientRect();
+    const mx = others[i] ? ref.left - 3 : ref ? ref.right + 1 : lr.left;
+    return { i, others, mx: mx - lr.left + tablist.scrollLeft };
+  }
+  function showHint(r, label, bad) {
+    hint.hidden = false;
+    hint.classList.toggle('bad', !!bad);
+    const v = active.view;
+    hint.style.left = (v.offsetLeft + r.x) + 'px'; hint.style.top = (v.offsetTop + r.y) + 'px';
+    hint.style.width = r.w + 'px'; hint.style.height = r.h + 'px';
+    hint.textContent = label;
+  }
+  function onDragMove(ev) {
+    if (!drag || ev.pointerId !== drag.id) return;
+    if (!drag.on) {
+      if (Math.hypot(ev.clientX - drag.x0, ev.clientY - drag.y0) < 6) return;
+      beginDrag();
+    }
+    drag.ghost.style.transform = 'translate(' + (ev.clientX + 10) + 'px,' + (ev.clientY + 8) + 'px)';
+    drag.target = null;
+    hint.hidden = true; mark.hidden = true;
+    const strip = $('tabs').getBoundingClientRect();
+    const stripShown = document.body.classList.contains('multi') || document.body.classList.contains('multi-hint');
+    const inStrip = stripShown && ev.clientY >= strip.top - 6 && ev.clientY <= strip.bottom + 10;
+    const inArea = active && (() => { const r = active.view.getBoundingClientRect(); return ev.clientX >= r.left && ev.clientX <= r.right && ev.clientY >= r.top && ev.clientY <= r.bottom; })();
+    if (inStrip) {
+      const s = stripIndex(ev.clientX);
+      mark.hidden = false; mark.style.left = s.mx + 'px';
+      drag.target = { kind: 'strip', index: s.i, others: s.others };
+      drag.ghost.dataset.hint = drag.kind === 'tab' ? 'переставить' : 'отдельной вкладкой';
+    } else if (inArea && drag.kind === 'tab' && drag.obj !== active) {
+      const r = active.view.getBoundingClientRect();
+      if (drag.obj.panes.length > 1) {
+        showHint({ x: 0, y: 0, w: r.width, h: r.height }, 'вкладку с несколькими терминалами не объединить', true);
+      } else if (active.panes.length >= 4) {
+        showHint({ x: 0, y: 0, w: r.width, h: r.height }, 'в одной вкладке не больше 4 терминалов', true);
+      } else {
+        const plan = mergePlan(active, ev.clientX - r.left, ev.clientY - r.top);
+        showHint(plan.rect, plan.label);
+        drag.target = { kind: 'merge', plan };
+      }
+      drag.ghost.dataset.hint = '';
+    } else if (inArea && drag.kind === 'pane' && tabOf(drag.obj) === active) {
+      const r = active.view.getBoundingClientRect();
+      const over = active.panes.find(s => { const p = s.el.getBoundingClientRect(); return s !== drag.obj && ev.clientX >= p.left && ev.clientX <= p.right && ev.clientY >= p.top && ev.clientY <= p.bottom; });
+      if (over) {
+        const p = over.el.getBoundingClientRect();
+        showHint({ x: p.left - r.left, y: p.top - r.top, w: p.width, h: p.height }, 'поменять местами');
+        drag.target = { kind: 'swap', with: over };
+      }
+      drag.ghost.dataset.hint = over ? '' : 'к вкладкам - отдельной вкладкой';
+    } else {
+      drag.ghost.dataset.hint = '';
+    }
+  }
+  function onDragEnd(ev) {
+    if (!drag || ev.pointerId !== drag.id) return;
+    const d = drag;
+    drag = null;
+    if (!d.on) return;
+    d.ghost.remove();
+    d.src.classList.remove('dragging');
+    document.body.classList.remove('dnd', 'multi-hint');
+    hint.hidden = true; mark.hidden = true;
+    dragJustEnded = true;
+    setTimeout(() => { dragJustEnded = false; }, 0);
+    const tg = d.target;
+    if (!tg) return;
+    if (d.kind === 'tab' && tg.kind === 'strip') {
+      const t = d.obj, ref = tg.others[tg.index];
+      tabs.splice(tabs.indexOf(t), 1);
+      tabs.splice(ref ? tabs.indexOf(ref) : tabs.length, 0, t);
+      tablist.insertBefore(t.el, ref ? ref.el : mark);
+    } else if (d.kind === 'tab' && tg.kind === 'merge') {
+      const src = d.obj, s = src.panes[0], t = active, plan = tg.plan;
+      // The joining terminal starts where the hint showed it.
+      s.el.classList.add('instant');
+      s.el.style.left = plan.rect.x + 'px'; s.el.style.top = plan.rect.y + 'px';
+      s.el.style.width = plan.rect.w + 'px'; s.el.style.height = plan.rect.h + 'px';
+      t.view.appendChild(s.el);
+      requestAnimationFrame(() => s.el.classList.remove('instant'));
+      t.panes = plan.order.map(o => o === 'P' ? s : t.panes[o]);
+      t.layout = plan.layout;
+      tabs.splice(tabs.indexOf(src), 1);
+      src.el.classList.add('leave');
+      setTimeout(() => { src.el.remove(); src.view.remove(); }, 220);
+      setActivePane(s);
+      renderTab(t);
+      layout(t, true);
+      updateMode();
+      s.term.focus();
+    } else if (d.kind === 'pane' && tg.kind === 'strip') {
+      const s = d.obj, from = tabOf(s), ref = tg.others[tg.index];
+      takePane(from, s);
+      renderTab(from);
+      const t = makeTab([s], ref ? tabs.indexOf(ref) : tabs.length);
+      layout(from, true);
+      activate(t);
+    } else if (d.kind === 'pane' && tg.kind === 'swap') {
+      const t = active, a = t.panes.indexOf(d.obj), b = t.panes.indexOf(tg.with);
+      [t.panes[a], t.panes[b]] = [t.panes[b], t.panes[a]];
+      layout(t, true);
+    }
+  }
+  window.addEventListener('pointermove', onDragMove);
+  window.addEventListener('pointerup', onDragEnd);
+  window.addEventListener('pointercancel', onDragEnd);
+
+  // ---------- the "+" menu ----------
+  let agentsCache = null;
+  function openMenu(anchor) {
+    const here = (activePane && activePane.agent) || PAGE.agent;
+    addMenu.innerHTML = '';
+    const item = (html, fn, cls) => {
+      const b = document.createElement('button');
+      b.type = 'button'; b.className = 'item ' + (cls || ''); b.innerHTML = html;
+      b.onclick = fn;
+      addMenu.appendChild(b);
+      return b;
+    };
+    const esc = s => String(s).replace(/[&<>"]/g, c => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));
+    item('<span class="ico">+</span><span><b>Новый терминал здесь</b><small>' + esc(here.name) + ' · ' + esc(here.user + '@' + here.host) + '</small></span>',
+      () => { closeMenu(); openTerminal(here); });
+    item('<span class="ico">' + KEYI + '</span><span><b>SSH-подключение</b><small>агент откроет SSH к другому хосту</small></span>',
+      () => { closeMenu(); openSSH(here); });
+    const other = item('<span class="ico">⇄</span><span><b>На другой машине</b><small>выбрать из списка</small></span><span class="chev">›</span>', () => {
+      other.remove();
+      const list = document.createElement('div');
+      list.className = 'mlist';
+      list.innerHTML = '<div class="muted" style="padding:8px 10px;font-size:13px">загрузка…</div>';
+      addMenu.appendChild(list);
+      (agentsCache ? Promise.resolve(agentsCache) : fetch('/api/panel/agents/presence', { cache: 'no-store' }).then(r => r.json()))
+        .then(all => {
+          agentsCache = all;
+          list.innerHTML = '';
+          all.forEach(a => {
+            const b = document.createElement('button');
+            b.type = 'button'; b.className = 'item machine'; b.disabled = !a.online;
+            b.innerHTML = '<span class="dot ' + (a.online ? 'ok' : 'off') + '"></span><span><b>' + esc(a.name) + '</b><small>' +
+              esc(a.user + '@' + a.hostname) + (a.online ? '' : ' · ' + esc(a.seen)) + '</small></span>';
+            b.onclick = () => { closeMenu(); openTerminal({ id: a.id, name: a.name, host: a.hostname, user: a.user }); };
+            list.appendChild(b);
+          });
+          if (!all.length) list.innerHTML = '<div class="muted" style="padding:8px 10px">машин нет</div>';
+          placeMenu(anchor);
+        })
+        .catch(() => { list.innerHTML = '<div class="muted" style="padding:8px 10px">не загрузилось</div>'; });
+    });
+    addMenu.hidden = false;
+    placeMenu(anchor);
+    setTimeout(() => document.addEventListener('pointerdown', outside, true), 0);
+  }
+  function placeMenu(anchor) {
+    const r = anchor.getBoundingClientRect(), m = addMenu.getBoundingClientRect();
+    addMenu.style.left = Math.max(8, Math.min(innerWidth - m.width - 8, r.right - m.width)) + 'px';
+    addMenu.style.top = Math.min(innerHeight - m.height - 8, r.bottom + 6) + 'px';
+  }
+  function outside(ev) { if (!addMenu.contains(ev.target)) closeMenu(); }
+  function closeMenu() {
+    addMenu.hidden = true;
+    agentsCache = null;
+    document.removeEventListener('pointerdown', outside, true);
+  }
+  addBtn.onclick = () => openMenu(addBtn);
+  floatAdd.onclick = () => openMenu(floatAdd);
+  $('emptyadd').onclick = ev => openMenu(ev.currentTarget);
+  document.addEventListener('keydown', ev => { if (ev.key === 'Escape' && !addMenu.hidden) closeMenu(); });
+
+  // ---------- the SSH dialog ----------
+  const KEYI = '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="7.5" cy="15.5" r="4.5"/><path d="m21 2-9.6 9.6M15.5 7.5l3 3L22 7l-3-3"/></svg>';
+  let sshDlg = null;
+  function openSSH(here) {
+    if (!sshDlg) sshDlg = makeSSHDialog();
+    sshDlg.show(here);
+  }
+  function makeSSHDialog() {
+    const d = document.createElement('dialog');
+    d.className = 'sshdlg';
+    d.innerHTML =
+      '<form method="dialog" autocomplete="off">' +
+      '<div class="dlg-h"><span class="ico">' + KEYI + '</span><strong style="flex:1">SSH-подключение</strong>' +
+      '<button type="button" class="btn ghost small icon close x" data-close aria-label="Закрыть">' + X + '</button></div>' +
+      '<div class="dlg-b">' +
+      '<label class="f"><span>Подключаться с машины</span><select name="agent"></select></label>' +
+      '<div class="frow"><label class="f grow"><span>Хост</span><input type="text" name="host" placeholder="example.com или 10.0.0.5" required autocapitalize="off" spellcheck="false"></label>' +
+      '<label class="f port"><span>Порт</span><input type="number" name="port" min="1" max="65535" value="22" required></label></div>' +
+      '<label class="f"><span>Пользователь</span><input type="text" name="user" placeholder="root" required autocapitalize="off" spellcheck="false"></label>' +
+      '<div class="f"><span>Вход</span><div class="seg" role="tablist">' +
+      '<button type="button" data-auth="password" class="on">Пароль</button><button type="button" data-auth="key">Ключ</button><button type="button" data-auth="agent">Ключи агента</button></div></div>' +
+      '<div class="auth" data-for="password"><input type="password" name="password" placeholder="пароль" autocomplete="off"></div>' +
+      '<div class="auth" data-for="key" hidden>' +
+      '<textarea name="key" rows="5" spellcheck="false" placeholder="-----BEGIN OPENSSH PRIVATE KEY-----&#10;…вставьте ключ или загрузите файл"></textarea>' +
+      '<div class="frow"><button type="button" class="btn ghost small" data-load>Загрузить файл…</button><span class="muted keyname"></span>' +
+      '<input type="file" hidden></div>' +
+      '<input type="password" name="passphrase" placeholder="фраза ключа, если есть" autocomplete="off"></div>' +
+      '<p class="auth muted" data-for="agent" hidden>Агент войдёт своими ключами из ~/.ssh (id_ed25519, id_ecdsa, id_rsa) без фразы.</p>' +
+      '<p class="sshmsg"></p>' +
+      '<div class="row end"><button type="button" class="btn ghost" data-close>Отмена</button><button type="submit">Подключиться</button></div>' +
+      '</div></form>';
+    document.body.appendChild(d);
+    const f = d.querySelector('form'), msg = d.querySelector('.sshmsg');
+    let auth = 'password';
+    const setAuth = a => {
+      auth = a;
+      d.querySelectorAll('.seg button').forEach(b => b.classList.toggle('on', b.dataset.auth === a));
+      d.querySelectorAll('.auth').forEach(el => { el.hidden = el.dataset.for !== a; });
+    };
+    d.querySelectorAll('.seg button').forEach(b => { b.onclick = () => setAuth(b.dataset.auth); });
+    d.querySelectorAll('[data-close]').forEach(b => { b.onclick = () => close(); });
+    const file = d.querySelector('input[type=file]');
+    d.querySelector('[data-load]').onclick = () => file.click();
+    file.onchange = () => {
+      const fl = file.files[0];
+      if (!fl) return;
+      if (fl.size > 32768) { msg.textContent = 'файл великоват для ключа'; return; }
+      fl.text().then(t => { f.key.value = t.trim() + '\n'; d.querySelector('.keyname').textContent = fl.name; msg.textContent = ''; });
+      file.value = '';
+    };
+    // then runs once the dialog is shut and focus is back where it was, so
+    // what it focuses stays focused.
+    function close(then) {
+      d.close();
+      if (then) then();
+    }
+    d.addEventListener('cancel', ev => { ev.preventDefault(); close(); });
+    d.addEventListener('click', ev => { if (ev.target === d) close(); });
+    let agents = [];
+    f.onsubmit = ev => {
+      ev.preventDefault();
+      const a = agents.find(x => x.id === f.agent.value);
+      if (!a) { msg.textContent = 'выберите машину'; return; }
+      const t = { host: f.host.value.trim(), port: Number(f.port.value) || 22, user: f.user.value.trim() };
+      if (auth === 'password') {
+        if (!f.password.value) { msg.textContent = 'введите пароль'; f.password.focus(); return; }
+        t.password = f.password.value;
+      } else if (auth === 'key') {
+        if (!/PRIVATE KEY/.test(f.key.value)) { msg.textContent = 'вставьте закрытый ключ или загрузите файл'; return; }
+        t.key = f.key.value;
+        if (f.passphrase.value) t.passphrase = f.passphrase.value;
+      }
+      try { localStorage.setItem('lpra.ssh.last', JSON.stringify({ agent: a.id, host: t.host, port: t.port, user: t.user, auth: auth })); } catch (e) { /* not kept */ }
+      f.password.value = ''; f.passphrase.value = ''; f.key.value = '';
+      d.querySelector('.keyname').textContent = '';
+      close(() => openTerminal(a, t));
+    };
+    return {
+      show(here) {
+        msg.textContent = '';
+        let last = {};
+        try { last = JSON.parse(localStorage.getItem('lpra.ssh.last') || '{}'); } catch (e) { /* none */ }
+        agents = [here];
+        const fill = () => {
+          f.agent.innerHTML = '';
+          agents.forEach(a => {
+            const o = document.createElement('option');
+            o.value = a.id; o.textContent = a.name + ' · ' + a.user + '@' + a.host + (a.online === false ? ' (не в сети)' : '');
+            o.disabled = a.online === false;
+            f.agent.appendChild(o);
+          });
+          f.agent.value = agents.some(a => a.id === last.agent && a.online !== false) ? last.agent : here.id;
+        };
+        fill();
+        fetch('/api/panel/agents/presence', { cache: 'no-store' }).then(r => r.json()).then(all => {
+          agents = all.map(a => ({ id: a.id, name: a.name, host: a.hostname, user: a.user, online: a.online }));
+          if (!agents.some(a => a.id === here.id)) agents.unshift(here);
+          fill();
+        }).catch(() => {});
+        if (last.host) { f.host.value = last.host; f.port.value = last.port || 22; f.user.value = last.user || ''; }
+        setAuth(last.auth === 'key' || last.auth === 'agent' ? last.auth : 'password');
+        d.showModal();
+        // On a phone the keyboard waits for a tap.
+        if (desk) (last.host ? (last.auth === 'password' || !last.auth ? f.password : f.host) : f.host).focus();
+      }
+    };
+  }
+
+  // ---------- page ----------
+  function refit() {
+    if (touch && window.visualViewport) {
+      // Follow the visible area, so the extra keys sit right above the
+      // on-screen keyboard.
+      const vv = window.visualViewport;
+      document.body.style.top = vv.offsetTop + 'px';
+      document.body.style.height = vv.height + 'px';
+    }
+    if (active) layout(active, false);
+  }
+  window.addEventListener('resize', refit);
+  if (touch && window.visualViewport) {
+    window.visualViewport.addEventListener('resize', refit);
+    window.visualViewport.addEventListener('scroll', refit);
+  }
+  window.addEventListener('pagehide', () => {
+    tabs.forEach(t => t.panes.forEach(s => { if (s.sid) navigator.sendBeacon(base + s.sid + '/close'); }));
+  });
+
+  // For the touch helpers in the page: the terminal being typed in.
+  window.TermPane = { active: () => activePane };
+  openTerminal(PAGE.agent);
+  refit();
+})();

internal/server/web/static/users.js

@@ -0,0 +1,105 @@
+// The users table in Settings: the role, the machines a user may use (a
+// dialog with a list to tick), the password sign-in and whether the user
+// may switch it themselves. Each change is saved at once.
+(function () {
+  'use strict';
+  var table = document.querySelector('table.users');
+  if (!table) return;
+  var $ = function (id) { return document.getElementById(id); };
+
+  function save(id, body) {
+    return fetch('/api/panel/users/' + id, {method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify(body)})
+      .then(function (r) { return r.json(); })
+      .catch(function () { return {ok: false, error: 'ошибка сети'}; });
+  }
+  function note(tr, text, bad) {
+    var n = tr.querySelector('.u-note');
+    if (!n) {
+      n = document.createElement('div');
+      n.className = 'u-note';
+      tr.cells[0].appendChild(n);
+    }
+    n.textContent = text;
+    n.classList.toggle('bad', !!bad);
+    n.classList.remove('fade');
+    void n.offsetWidth;
+    n.classList.add('fade');
+  }
+
+  table.addEventListener('change', function (ev) {
+    var tr = ev.target.closest('tr'), id = tr && tr.dataset.id, el = ev.target;
+    if (!id) return;
+    var body = {}, undo;
+    if (el.classList.contains('u-role')) {
+      body.role = el.value;
+      undo = function () { el.value = el.value === 'user' ? 'admin' : 'user'; };
+    } else if (el.classList.contains('u-pw')) {
+      body.password_off = !el.checked;
+      undo = function () { el.checked = !el.checked; };
+    } else if (el.classList.contains('u-lock')) {
+      body.pw_locked = el.checked;
+      undo = function () { el.checked = !el.checked; };
+    } else {
+      return;
+    }
+    save(id, body).then(function (r) {
+      if (!r.ok) { undo(); note(tr, r.error || 'не сохранилось', true); return; }
+      note(tr, 'сохранено');
+      if (body.role) {
+        var user = body.role === 'user';
+        tr.querySelector('.u-agents').hidden = !user;
+        tr.querySelector('.u-count').hidden = !user;
+      }
+    });
+  });
+
+  // ---- the machines of a user ----
+  var dlg = $('uadlg'), list = $('ualist'), cur = null;
+  function render(filter) {
+    var f = (filter || '').toLowerCase();
+    list.querySelectorAll('label').forEach(function (l) {
+      l.hidden = f && l.textContent.toLowerCase().indexOf(f) < 0;
+    });
+  }
+  table.addEventListener('click', function (ev) {
+    var b = ev.target.closest('.u-agents');
+    if (!b) return;
+    var tr = b.closest('tr');
+    cur = tr;
+    $('uaname').textContent = tr.dataset.name;
+    list.innerHTML = '<div class="muted">загрузка…</div>';
+    $('uafilter').value = '';
+    dlg.showModal();
+    fetch('/api/panel/users/' + tr.dataset.id + '/agents', {cache: 'no-store'}).then(function (r) { return r.json(); }).then(function (d) {
+      list.innerHTML = '';
+      d.agents.forEach(function (a) {
+        var l = document.createElement('label');
+        l.className = 'ua-item';
+        l.innerHTML = '<input type="checkbox"><span class="dot ' + (a.online ? 'on' : 'off') + '"></span><span class="ua-name"></span><span class="muted ua-host"></span>';
+        l.querySelector('input').value = a.id;
+        l.querySelector('input').checked = a.on;
+        l.querySelector('.ua-name').textContent = a.name;
+        l.querySelector('.ua-host').textContent = a.hostname;
+        list.appendChild(l);
+      });
+      if (!d.agents.length) list.innerHTML = '<div class="muted">машин пока нет</div>';
+    });
+  });
+  $('uafilter').addEventListener('input', function (ev) { render(ev.target.value); });
+  $('uaall').onclick = function () { list.querySelectorAll('label:not([hidden]) input').forEach(function (i) { i.checked = true; }); };
+  $('uanone').onclick = function () { list.querySelectorAll('label:not([hidden]) input').forEach(function (i) { i.checked = false; }); };
+  $('uaclose').onclick = $('uacancel').onclick = function () { dlg.close(); };
+  $('uasave').onclick = function () {
+    var ids = [].map.call(list.querySelectorAll('input:checked'), function (i) { return i.value; });
+    save(cur.dataset.id, {agents: ids}).then(function (r) {
+      if (!r.ok) { note(cur, r.error || 'не сохранилось', true); return; }
+      cur.querySelector('.u-count').textContent = ids.length;
+      note(cur, 'машин: ' + ids.length);
+      dlg.close();
+    });
+  };
+
+  // ---- a new user: the machines appear for a plain user ----
+  var role = $('newrole'), pick = $('newagents');
+  if (role) role.onchange = function () { pick.hidden = role.value !== 'user'; };
+})();

internal/server/web/templates/dashboard.html

@@ -4,17 +4,17 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Машины - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Удалённый доступ</div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Удалённый доступ</div>
   <nav>
     <a href="/">Машины</a>
-    <a href="/settings">Настройки</a>
+    {{if .IsAdmin}}<a href="/settings">Настройки</a>{{end}}
-    <form method="post" action="/logout" style="display:inline; margin-left:22px">
+    <button type="button" class="btn ghost icon acct-btn" id="acct" title="Аккаунт" aria-label="Аккаунт"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="8" r="4"/><path d="M4 21a8 8 0 0 1 16 0"/></svg></button>
-      <button class="btn ghost small" type="submit">Выйти</button>
-    </form>
   </nav>
 </header>
 <div class="wrap">
@@ -48,13 +48,13 @@
               <a class="btn ghost small icon" href="/agents/{{.ID}}/edit" data-tip="Изменить" aria-label="Изменить">
                 <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 20h9"/><path d="M16.5 3.5a2.12 2.12 0 0 1 3 3L7 19l-4 1 1-4 12.5-12.5z"/></svg>
               </a>
-              <form method="post" action="/agents/{{.ID}}/delete" style="display:inline"
+              {{if $.IsAdmin}}<form method="post" action="/agents/{{.ID}}/delete" style="display:inline"
                     onsubmit="return confirm('Удалить машину {{.Name}}? Сервис на ней продолжит работать, но перестанет быть виден. Чтобы снова подключиться - переустановите агента.')">
                 <input type="hidden" name="csrf" value="{{$.CSRF}}">
                 <button class="btn danger small icon" type="submit" data-tip="Удалить" aria-label="Удалить">
                   <svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M3 6h18"/><path d="M8 6V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/><path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6"/><line x1="10" y1="11" x2="10" y2="17"/><line x1="14" y1="11" x2="14" y2="17"/></svg>
                 </button>
-              </form>
+              </form>{{end}}
             </div>
           </td>
         </tr>
@@ -62,8 +62,9 @@
       </tbody>
     </table>
     {{else}}
-      <p class="muted">Пока нет подключённых машин. Добавьте первую в разделе
+      {{if .IsAdmin}}<p class="muted">Пока нет подключённых машин. Добавьте первую в разделе
         <a href="/settings">Настройки</a> - там одна команда для установки.</p>
+      {{else}}<p class="muted">Вам пока не выдали ни одной машины - попросите администратора.</p>{{end}}
     {{end}}
   </div>
 </div>
@@ -100,5 +101,6 @@
   if (Object.keys(rows).length) schedule();
 })();
 </script>
+<script src="{{asset "account.js"}}"></script>
 </body>
 </html>

internal/server/web/templates/edit.html

@@ -4,11 +4,13 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Изменить машину - LPRA</title>
-<link rel="stylesheet" href="/static/app.css?v={{.ServerVersion}}-2">
+<link rel="stylesheet" href="{{asset "app.css"}}">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Изменить машину</div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Изменить машину</div>
   <nav>
     <a href="/">← Машины</a>
     <a href="/agents/{{.Agent.ID}}/terminal">Терминал</a>
@@ -72,9 +74,29 @@
     {{end}}
   </div>
 
+  <div class="card">
+    <h2>Связь с сервером</h2>
+    <p class="muted">
+      Сейчас: {{if not .Online}}<span>офлайн</span>{{else if .OnWS}}<span style="color:var(--ok)">WebSocket</span>{{else}}<span>long polling</span>{{end}}{{if and .Online .ViaDirect}} <span class="muted">(direct)</span>{{end}}
+    </p>
+    <form method="post" action="/agents/{{.Agent.ID}}/transport" class="row">
+      <input type="hidden" name="csrf" value="{{.CSRF}}">
+      <select name="transport">
+        <option value="auto" {{if eq .Transport "auto"}}selected{{end}}>Авто: WebSocket, а если не выходит - long polling</option>
+        <option value="ws" {{if eq .Transport "ws"}}selected{{end}}>Только WebSocket</option>
+        <option value="lp" {{if eq .Transport "lp"}}selected{{end}}>Только long polling</option>
+      </select>
+      <button type="submit">Сохранить</button>
+    </form>
+    <p class="muted" style="font-size:13px; margin-top:10px">WebSocket держит одно соединение: команды и терминал идут по нему без отдельного запроса на каждое нажатие.
+      В режиме «Авто» клиент, потеряв WebSocket, переходит на long polling и раз в минуту пробует вернуться.
+      Нужен клиент 0.1.0+ и прокси, пропускающий WebSocket (nginx: заголовки Upgrade и Connection).</p>
+  </div>
+
   <div class="card">
     <h2>Версия клиента</h2>
-    {{if .Updated}}<div class="err" style="background:#1d3a24;border-color:#2b6b3a;color:#b3ffcb">Команда обновления отправлена. Клиент скачает свежий бинарник и перезапустится.</div>{{end}}
+    {{if .Updated}}<div class="err" style="background:#1d3a24;border-color:#2b6b3a;color:#b3ffcb">Клиент {{if .UpdateMsg}}{{.UpdateMsg}}{{else}}обновлён и перезапускается{{end}}. Через несколько секунд он вернётся с новой версией.</div>{{end}}
+    {{if .UpdateErr}}<div class="err">Обновление не вышло: {{.UpdateErr}}</div>{{end}}
     <p class="muted">
       Клиент: <code>{{if .Agent.Version}}{{.Agent.Version}}{{else}}неизвестно{{end}}</code>
       · Сервер: <code>{{.ServerVersion}}</code>
@@ -91,7 +113,7 @@
     {{end}}
   </div>
 
-  <div class="card">
+  {{if .IsAdmin}}<div class="card">
     <h2>Удаление</h2>
     <p class="muted">Удаляет машину из панели. Сервис на самой машине продолжит работать,
       но перестанет быть виден; чтобы подключиться снова - переустановите агента.</p>
@@ -100,7 +122,7 @@
       <input type="hidden" name="csrf" value="{{.CSRF}}">
       <button class="btn danger" type="submit">Удалить машину</button>
     </form>
-  </div>
+  </div>{{end}}
 </div>
 </body>
 </html>

internal/server/web/templates/forwards.html

@@ -4,7 +4,9 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Порты · {{.Agent.Name}} - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
 <style>
   /* One line: fixed narrow fields, the label takes what is left. */
   .frow { display:flex; align-items:flex-end; gap:12px; flex-wrap:wrap; }
@@ -37,7 +39,7 @@
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Порты - {{.Agent.Name}} <span class="muted">({{.Agent.Hostname}})</span></div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Порты - {{.Agent.Name}} <span class="muted">({{.Agent.Hostname}})</span></div>
   <nav>
     <a href="/">← Машины</a>
     <a href="/agents/{{.Agent.ID}}/terminal">Терминал</a>

internal/server/web/templates/login.html

@@ -4,21 +4,67 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Вход - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
 </head>
 <body>
 <div class="center">
   <div class="card">
     <h1>Вход в панель</h1>
-    {{if .Error}}<div class="err">{{.Error}}</div>{{end}}
+    {{if .Error}}<div class="err" id="err">{{.Error}}</div>{{else}}<div class="err" id="err" hidden></div>{{end}}
     <form method="post" action="/login">
-      <label>Имя пользователя</label>
+      <label for="u">Имя пользователя</label>
-      <input type="text" name="username" autofocus required>
+      <input type="text" id="u" name="username" value="{{.Username}}" autocomplete="username webauthn" autofocus required>
-      <label>Пароль</label>
+      <label for="pw">Пароль</label>
-      <input type="password" name="password" required>
+      <input type="password" id="pw" name="password" autocomplete="current-password" required>
-      <div style="margin-top:18px"><button type="submit">Войти</button></div>
+      <div style="margin-top:18px"><button type="submit" style="width:100%">Войти</button></div>
     </form>
+    <div class="or" id="or" hidden>или</div>
+    <button type="button" class="keybtn btn ghost" id="keylogin" hidden><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="7.5" cy="15.5" r="4.5"/><path d="m21 2-9.6 9.6M15.5 7.5l3 3L22 7l-3-3"/></svg>Войти с ключом доступа</button>
   </div>
 </div>
+<script>
+// Sign in with a passkey: with the name typed, its keys are offered; without
+// it, the device offers the keys it keeps for this site.
+(function () {
+  if (!(window.PublicKeyCredential && navigator.credentials && window.isSecureContext)) return;
+  var btn = document.getElementById('keylogin'), err = document.getElementById('err');
+  btn.hidden = false;
+  document.getElementById('or').hidden = false;
+  var enc = function (buf) {
+    var s = '', b = new Uint8Array(buf);
+    for (var i = 0; i < b.length; i++) s += String.fromCharCode(b[i]);
+    return btoa(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+  };
+  var dec = function (str) {
+    var s = atob(str.replace(/-/g, '+').replace(/_/g, '/') + '==='.slice((str.length + 3) % 4)), b = new Uint8Array(s.length);
+    for (var i = 0; i < s.length; i++) b[i] = s.charCodeAt(i);
+    return b.buffer;
+  };
+  function show(t) { err.textContent = t; err.hidden = !t; }
+  btn.onclick = function () {
+    btn.disabled = true;
+    show('');
+    fetch('/api/login/key/begin', {method: 'POST', headers: {'Content-Type': 'application/json'},
+      body: JSON.stringify({username: document.getElementById('u').value})})
+      .then(function (r) { return r.json(); })
+      .then(function (r) {
+        if (!r.ok) throw new Error(r.error);
+        var o = r.options;
+        o.challenge = dec(o.challenge);
+        o.allowCredentials.forEach(function (c) { c.id = dec(c.id); });
+        return navigator.credentials.get({publicKey: o});
+      })
+      .then(function (c) {
+        return fetch('/api/login/key/finish', {method: 'POST', headers: {'Content-Type': 'application/json'},
+          body: JSON.stringify({id: enc(c.rawId), clientDataJSON: enc(c.response.clientDataJSON),
+            authenticatorData: enc(c.response.authenticatorData), signature: enc(c.response.signature)})})
+          .then(function (r) { return r.json(); });
+      })
+      .then(function (r) { if (!r.ok) throw new Error(r.error); location.href = '/'; })
+      .catch(function (e) { show(e && e.name === 'NotAllowedError' ? 'Вход по ключу отменён.' : (e && e.message) || 'Не вышло.'); })
+      .then(function () { btn.disabled = false; });
+  };
+})();
+</script>
 </body>
 </html>

internal/server/web/templates/settings.html

@@ -4,17 +4,58 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Настройки - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
+<style>
+  /* An install command, with a button to copy it at its right. */
+  /* Users: role, machines, password sign-in. */
+  .tablewrap { overflow-x:auto; }
+  table.users th { font-size:12px; font-weight:500; color:var(--muted); text-align:left; white-space:nowrap; }
+  table.users td { vertical-align:middle; }
+  table.users select.u-role { width:auto; height:30px; padding:2px 30px 2px 8px; font-size:13px; }
+  table.users .u-agents { vertical-align:middle; margin-left:4px; }
+  table.users .u-count { font-size:12px; margin-left:2px; }
+  table.users .u-lock { width:16px; height:16px; cursor:pointer; }
+  .u-note { font-size:12px; color:var(--ok); opacity:0; }
+  .u-note.bad { color:var(--danger); }
+  .u-note.fade { animation:u-note 3s ease forwards; }
+  @keyframes u-note { 0%, 70% { opacity:1; } 100% { opacity:0; } }
+  .u-add { margin-top:14px; }
+  .u-pick { display:flex; flex-wrap:wrap; gap:6px; align-items:center; animation:u-in .2s ease; }
+  .u-pick[hidden] { display:none; }
+  .u-pick > .muted:first-child { flex-basis:100%; }
+  .u-chip { display:inline-flex; align-items:center; gap:6px; margin:0; padding:5px 10px; border:1px solid var(--border); border-radius:16px;
+            font-size:13px; color:var(--text); cursor:pointer; transition:border-color .15s, background .15s; }
+  .u-chip:has(input:checked) { border-color:var(--accent); background:#12202f; }
+  .u-chip input { width:14px; height:14px; margin:0; }
+  @keyframes u-in { from { opacity:0; transform:translateY(-4px); } }
+  #uadlg { max-width:480px; }
+  .ua-tools { display:flex; gap:8px; margin-bottom:10px; }
+  .ua-tools input { flex:1; height:32px; }
+  .ua-list { max-height:50vh; overflow:auto; border:1px solid var(--border); border-radius:9px; padding:4px; }
+  .ua-item { display:flex; align-items:center; gap:10px; margin:0; padding:8px 10px; border-radius:7px; cursor:pointer; color:var(--text); font-size:14px; }
+  .ua-item:hover { background:#151a21; }
+  .ua-item[hidden] { display:none; }
+  .ua-item input { width:16px; height:16px; margin:0; }
+  .ua-host { margin-left:auto; font-size:12px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
+  .copybox { position:relative; }
+  .copybox pre { padding-right:48px; }
+  .copybox .copy { position:absolute; top:7px; right:7px; width:30px; height:30px; padding:0;
+                   display:inline-flex; align-items:center; justify-content:center; background:var(--panel); }
+  .copybox .copy.done { color:var(--ok); border-color:var(--ok); }
+  .codeform { display:flex; flex-wrap:wrap; align-items:center; gap:8px 10px; margin-top:10px; font-size:13px; }
+  .codeform label { margin:0; }
+  .codeform input[type=number] { width:72px; height:30px; padding:4px 8px; }
+  .codeform .ico { display:inline-flex; align-items:center; gap:6px; height:30px; }
+</style>
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Удалённый доступ</div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Удалённый доступ</div>
   <nav>
     <a href="/">Машины</a>
-    <a href="/settings">Настройки</a>
+    <button type="button" class="btn ghost icon acct-btn" id="acct" title="Аккаунт" aria-label="Аккаунт"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="8" r="4"/><path d="M4 21a8 8 0 0 1 16 0"/></svg></button>
-    <form method="post" action="/logout" style="display:inline; margin-left:22px">
-      <button class="btn ghost small" type="submit">Выйти</button>
-    </form>
   </nav>
 </header>
 <div class="wrap">
@@ -27,14 +68,29 @@
       поставит сервис и зарегистрирует машину.</p>
 
     <label>Короткая команда (секрет уже вшит в ссылку)</label>
-    <pre id="short">{{.InstallShort}}</pre>
+    <div class="copybox"><pre id="short">{{.InstallShort}}</pre><button type="button" class="btn ghost small icon sq copy" data-copy="short" title="Скопировать" aria-label="Скопировать"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg></button></div>
+
+    <form method="post" action="/settings/install/code" class="codeform"
+          onsubmit="return confirm('Сделать новый код? Старая короткая ссылка перестанет работать.')">
+      <input type="hidden" name="csrf" value="{{.CSRF}}">
+      <label for="codelen">Символов в коде</label>
+      <input type="number" id="codelen" name="len" min="3" max="24" value="{{.CodeLen}}">
+      <button type="submit" class="btn ghost small ico"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12a9 9 0 1 1-3-6.7L21 8"/><path d="M21 3v5h-5"/></svg>Новый код</button>
+      <span class="muted">латиница и цифры, от 3 до 24; новый код отменяет старую ссылку</span>
+    </form>
 
     <details style="margin-top:10px">
       <summary class="muted" style="cursor:pointer">Полные варианты (секрет в команде)</summary>
       <label>curl</label>
-      <pre id="curl">{{.InstallCurl}}</pre>
+      <div class="copybox"><pre id="curl">{{.InstallCurl}}</pre><button type="button" class="btn ghost small icon sq copy" data-copy="curl" title="Скопировать" aria-label="Скопировать"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg></button></div>
       <label>wget</label>
-      <pre id="wget">{{.InstallWget}}</pre>
+      <div class="copybox"><pre id="wget">{{.InstallWget}}</pre><button type="button" class="btn ghost small icon sq copy" data-copy="wget" title="Скопировать" aria-label="Скопировать"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg></button></div>
+      {{if .Direct}}
+      <label>Короткая через прямой адрес (если основной недоступен)</label>
+      <div class="copybox"><pre id="dshort">{{.DirectShort}}</pre><button type="button" class="btn ghost small icon sq copy" data-copy="dshort" title="Скопировать" aria-label="Скопировать"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg></button></div>
+      <label>curl через прямой адрес</label>
+      <div class="copybox"><pre id="dcurl">{{.DirectCurl}}</pre><button type="button" class="btn ghost small icon sq copy" data-copy="dcurl" title="Скопировать" aria-label="Скопировать"><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg></button></div>
+      {{end}}
       <p class="muted">Без переменных окружения скрипт спросит секрет интерактивно:
         <code>curl -fsSL {{.Host}}/install.sh | sudo sh</code></p>
     </details>
@@ -42,11 +98,18 @@
 
   <div class="card">
     <h2>Адрес хоста</h2>
-    <p class="muted">URL, на который звонят агенты. Подставляется в скрипт установки.</p>
+    <form method="post" action="/settings/host" class="hostform">
-    <form method="post" action="/settings/host" class="row">
       <input type="hidden" name="csrf" value="{{.CSRF}}">
-      <input type="text" name="host" value="{{.Host}}" style="max-width:420px">
+      <label for="host">Основной</label>
-      <button type="submit">Сохранить</button>
+      <input type="text" id="host" name="host" value="{{.Host}}" placeholder="https://lpra.example.com">
+      <p class="muted">URL, на который звонят агенты. Подставляется в скрипт установки.</p>
+      <label for="direct">Прямой (без Cloudflare) - необязательно</label>
+      <input type="text" id="direct" name="direct" value="{{.Direct}}" placeholder="https://direct.lpra.example.com">
+      <p class="muted">Имя, которое ведёт прямо на сервер, мимо прокси. Агенты переходят на него, если основной
+        недоступен 30 секунд, и возвращаются, когда он ответит; уже установленные получат его сами. Установщик
+        качает агента с него, если основной не отвечает. Если хост туннеля ниже не задан, туннель тоже идёт на этот хост.
+        Ключи доступа с основного домена работают на прямом, если он его поддомен (direct.lpra.example.com).</p>
+      <div><button type="submit">Сохранить</button></div>
     </form>
   </div>
 
@@ -84,15 +147,38 @@
   </div>
 
   <div class="card">
-    <h2>Администраторы</h2>
+    <h2 id="users">Пользователи</h2>
-    <table>
+    <p class="muted" style="font-size:13px">Администратор видит всё. Пользователь - только выданные ему машины, без настроек.
+      «Пароль» - можно ли входить по паролю (выключить можно, когда у человека есть ключ доступа);
+      «Закрепить» - он не сможет сам поменять это в своём аккаунте.</p>
+    <div class="tablewrap"><table class="users">
+      <thead><tr><th>Имя</th><th>Роль</th><th>Вход</th><th title="Вход по паролю">Пароль</th><th title="Не даёт менять вход по паролю самому">Закрепить</th><th></th></tr></thead>
       <tbody>
       {{range .Admins}}
-        <tr>
+        <tr data-id="{{.ID}}" data-name="{{.Username}}">
-          <td>{{.Username}}</td>
+          <td>{{.Username}}{{if eq .ID $.Me.ID}} <span class="muted">(вы)</span>{{end}}</td>
-          <td style="text-align:right">
+          <td class="nowrap">
+            <select class="u-role" aria-label="Роль">
+              <option value="admin"{{if .IsAdmin}} selected{{end}}>Администратор</option>
+              <option value="user"{{if not .IsAdmin}} selected{{end}}>Пользователь</option>
+            </select>
+            <button type="button" class="btn ghost small icon sq u-agents" title="Машины пользователя" aria-label="Машины пользователя"{{if .IsAdmin}} hidden{{end}}><svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2"/><path d="M8 21h8M12 17v4"/></svg></button>
+            <span class="muted u-count"{{if .IsAdmin}} hidden{{end}}>{{index $.AgentCounts .ID}}</span>
+          </td>
+          <td class="muted">{{with index $.KeyCounts .ID}}ключей: {{.}}{{else}}только пароль{{end}}</td>
+          <td><input type="checkbox" class="sw u-pw" aria-label="Вход по паролю"{{if not (index $.PassOff .ID)}} checked{{end}}{{if not (index $.KeyCounts .ID)}} disabled title="Нет ключей доступа - пароль выключить нельзя"{{end}}></td>
+          <td><input type="checkbox" class="u-lock" aria-label="Закрепить"{{if .PwLocked}} checked{{end}}></td>
+          <td style="text-align:right" class="nowrap">
+            {{if index $.KeyCounts .ID}}
+            <form method="post" action="/settings/admins/keys/reset" style="display:inline"
+                  onsubmit="return confirm('Сбросить все ключи доступа {{.Username}}? Вход по паролю снова включится.')">
+              <input type="hidden" name="csrf" value="{{$.CSRF}}">
+              <input type="hidden" name="id" value="{{.ID}}">
+              <button class="btn ghost small" type="submit" title="Удалить все ключи доступа и снова включить вход по паролю">Сбросить ключи</button>
+            </form>
+            {{end}}
             <form method="post" action="/settings/admins/delete" style="display:inline"
-                  onsubmit="return confirm('Удалить администратора {{.Username}}?')">
+                  onsubmit="return confirm('Удалить {{.Username}}?')">
               <input type="hidden" name="csrf" value="{{$.CSRF}}">
               <input type="hidden" name="id" value="{{.ID}}">
               <button class="btn danger small" type="submit">Удалить</button>
@@ -101,17 +187,35 @@
         </tr>
       {{end}}
       </tbody>
-    </table>
+    </table></div>
-    <form method="post" action="/settings/admins/add" style="margin-top:14px">
+    <form method="post" action="/settings/admins/add" class="u-add">
       <input type="hidden" name="csrf" value="{{.CSRF}}">
       <div class="row">
-        <input type="text" name="username" placeholder="логин" style="max-width:200px" required>
+        <input type="text" name="username" placeholder="логин" style="max-width:200px" required autocomplete="off">
-        <input type="password" name="password" placeholder="пароль (мин. 8)" style="max-width:200px" required>
+        <input type="password" name="password" placeholder="пароль (мин. 8)" style="max-width:200px" required autocomplete="new-password">
+        <select name="role" id="newrole" style="max-width:180px">
+          <option value="admin">Администратор</option>
+          <option value="user">Пользователь</option>
+        </select>
         <button type="submit">Добавить</button>
       </div>
+      <div class="u-pick" id="newagents" hidden>
+        <div class="muted" style="font-size:13px;margin:10px 0 6px">Машины, к которым у него будет доступ:</div>
+        {{range .AllAgents}}<label class="u-chip"><input type="checkbox" name="agents" value="{{.ID}}"><span>{{.Name}}</span></label>{{else}}<span class="muted">машин пока нет</span>{{end}}
+      </div>
     </form>
   </div>
 
+<dialog id="uadlg" tabindex="-1">
+  <div class="dlg-h"><strong style="flex:1">Машины пользователя <span id="uaname"></span></strong>
+    <button type="button" class="btn ghost small icon close x" id="uaclose" title="Закрыть" aria-label="Закрыть"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M18 6 6 18M6 6l12 12"/></svg></button></div>
+  <div class="dlg-b">
+    <div class="ua-tools"><input type="text" id="uafilter" placeholder="поиск" autocomplete="off"><button type="button" class="btn ghost small" id="uaall">Все</button><button type="button" class="btn ghost small" id="uanone">Ни одной</button></div>
+    <div class="ua-list" id="ualist"></div>
+    <div class="row" style="justify-content:flex-end;margin-top:14px"><button type="button" class="btn ghost" id="uacancel">Отмена</button><button type="button" id="uasave">Сохранить</button></div>
+  </div>
+</dialog>
+
   <div class="card">
     <h2>Firewall (ufw)</h2>
     {{if not .UfwInstalled}}
@@ -176,5 +280,33 @@
 
   <p class="muted" style="font-size:12px; text-align:center">LPRA сервер · версия {{.ServerVersion}}</p>
 </div>
+<script>
+// Copy an install command: the clipboard API on https, the old way otherwise.
+(function () {
+  var CHECK = '<svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>';
+  function copy(text) {
+    if (navigator.clipboard && window.isSecureContext) return navigator.clipboard.writeText(text);
+    var ta = document.createElement('textarea');
+    ta.value = text;
+    ta.style.cssText = 'position:fixed;top:0;left:0;opacity:0';
+    document.body.appendChild(ta);
+    ta.select();
+    var ok = document.execCommand('copy');
+    ta.remove();
+    return ok ? Promise.resolve() : Promise.reject(new Error('нет доступа к буферу'));
+  }
+  document.querySelectorAll('.copybox .copy').forEach(function (b) {
+    var icon = b.innerHTML;
+    b.onclick = function () {
+      copy(document.getElementById(b.dataset.copy).textContent.trim()).then(function () {
+        b.innerHTML = CHECK; b.classList.add('done'); b.title = 'Скопировано';
+        setTimeout(function () { b.innerHTML = icon; b.classList.remove('done'); b.title = 'Скопировать'; }, 1500);
+      }, function (e) { alert('Не скопировалось: ' + e.message); });
+    };
+  });
+})();
+</script>
+<script src="{{asset "users.js"}}"></script>
+<script src="{{asset "account.js"}}"></script>
 </body>
 </html>

internal/server/web/templates/setup.html

@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Настройка - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
 </head>
 <body>
 <div class="center">

internal/server/web/templates/status.html

@@ -4,7 +4,9 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Статус · {{.Agent.Name}} - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
 <style>
   .meters { display:grid; grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)); gap:20px; margin-bottom:20px; }
   .meters .card { margin:0; }
@@ -42,7 +44,7 @@
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Статус - {{.Agent.Name}} <span class="muted">({{.Agent.Hostname}})</span></div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Статус - {{.Agent.Name}} <span class="muted">({{.Agent.Hostname}})</span></div>
   <nav>
     <a href="/">← Машины</a>
     <a href="/agents/{{.Agent.ID}}/terminal">Терминал</a>

internal/server/web/templates/terminal.html

@@ -4,17 +4,145 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Терминал · {{.Agent.Name}} - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
-<link rel="stylesheet" href="/static/xterm.css">
+<script src="{{asset "pin.js"}}"></script>
+<script src="{{asset "scroll.js"}}" defer></script>
+<link rel="stylesheet" href="{{asset "xterm.css"}}">
 <style>
   #status.st-ok  { color:#37c871; }
   #status.st-err { color:#ff5c5c; }
+  #status { display:inline-block; vertical-align:bottom; min-width:0; max-width:42vw; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
+  /* SSH: the badge on a pane, and the dialog to connect. */
+  .badge-ssh { flex:none; font-size:10px; font-weight:600; letter-spacing:.04em; padding:1px 5px; border-radius:4px;
+               background:#12202f; color:var(--accent); border:1px solid #1f3a57; }
+  dialog.sshdlg { max-width:460px; }
+  .sshdlg .dlg-h .ico { color:var(--accent); display:inline-flex; }
+  .sshdlg .dlg-b { display:grid; gap:12px; }
+  .sshdlg .f { display:grid; gap:5px; margin:0; }
+  .sshdlg .f > span { font-size:12px; color:var(--muted); }
+  .sshdlg .frow { display:flex; gap:10px; align-items:end; }
+  .sshdlg .frow .grow { flex:1; min-width:0; }
+  .sshdlg .frow .port { width:92px; flex:none; }
+  .sshdlg input, .sshdlg select, .sshdlg textarea { width:100%; box-sizing:border-box; }
+  .sshdlg textarea { font:12px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; resize:vertical; min-height:90px;
+                     background:var(--bg, #0c0f13); color:var(--text); border:1px solid var(--border); border-radius:8px; padding:8px 10px; }
+  .sshdlg textarea:focus { border-color:var(--accent); outline:none; }
+  .sshdlg .auth { display:grid; gap:8px; animation:auth-in .18s ease; }
+  .sshdlg .auth[hidden] { display:none; }
+  @keyframes auth-in { from { opacity:0; transform:translateY(-4px); } }
+  .sshdlg p.auth { margin:0; font-size:13px; }
+  .sshdlg .keyname { font-size:12px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; align-self:center; }
+  .sshdlg .seg { display:flex; padding:3px; gap:3px; background:#0c0f13; border:1px solid var(--border); border-radius:9px; }
+  .sshdlg .seg button { flex:1; padding:6px 8px; font-size:13px; background:transparent; color:var(--muted); border:0; border-radius:6px;
+                        transition:background .18s, color .18s; }
+  .sshdlg .seg button:hover { color:var(--text); }
+  .sshdlg .seg button.on { background:#12202f; color:var(--text); box-shadow:inset 0 0 0 1px #1f3a57; }
+  .sshdlg .sshmsg { margin:0; min-height:18px; font-size:13px; color:var(--danger); }
+  .sshdlg .row.end { display:flex; justify-content:flex-end; gap:8px; }
+  @media (max-width:520px) { .sshdlg .seg button { font-size:12px; padding:6px 4px; } }
+  /* The page is the terminal: bar, tabs, then the terminals to the bottom. */
+  body { height:100vh; display:flex; flex-direction:column; overflow:hidden; }
+  header.topbar { flex:none; }
+  /* Tabs: folded away while there is one, sliding in with the second. */
+  .tabs { flex:none; display:flex; align-items:flex-end; gap:4px; padding:0 16px; max-height:0; opacity:0; overflow:hidden;
+          transition:max-height .28s ease, opacity .22s ease, padding .28s ease; }
+  body.multi .tabs, body.multi-hint .tabs { max-height:48px; opacity:1; padding-top:10px; }
+  .tablist { position:relative; display:flex; gap:4px; min-width:0; overflow-x:auto; scrollbar-width:none; }
+  .tablist::-webkit-scrollbar { display:none; }
+  .tab { display:flex; align-items:center; gap:8px; flex:none; min-width:0; height:34px; padding:0 6px 0 12px; box-sizing:border-box;
+         border:1px solid var(--border); border-bottom:0; border-radius:9px 9px 0 0; background:#11151b; color:var(--muted);
+         font-size:13px; user-select:none; cursor:default; overflow:hidden; white-space:nowrap;
+         transition:background .18s, color .18s, width .22s ease, max-width .22s ease, opacity .2s, padding .22s ease; }
+  .tab:hover { color:var(--text); background:#151a21; }
+  .tab.on { background:var(--panel); color:var(--text); }
+  .tab.enter, .tab.leave { max-width:0; opacity:0; padding:0; }
+  .tab.dragging { opacity:.3; }
+  .tab-title { flex:1; overflow:hidden; text-overflow:ellipsis; min-width:0; }
+  .tab-edit { width:auto; min-width:60px; max-width:150px; height:24px; padding:2px 6px; font-size:13px; }
+  .tab-x, .pane-x { flex:none; width:20px; height:20px; padding:0; display:inline-flex; align-items:center; justify-content:center;
+                    background:transparent; border:0; border-radius:5px; color:var(--muted); opacity:.6; transition:opacity .15s, background .15s, color .15s; }
+  .tab-x:hover, .pane-x:hover { opacity:1; background:#3a1d1d; color:var(--danger); }
+  .tab-add { flex:none; width:34px; height:34px; padding:0; display:inline-flex; align-items:center; justify-content:center;
+             border:1px solid var(--border); border-bottom:0; border-radius:9px 9px 0 0; background:transparent; color:var(--muted);
+             font-size:18px; line-height:1; transition:background .18s, color .18s; }
+  .tab-add:hover { background:#151a21; color:var(--text); }
+  .tabmark { position:absolute; top:6px; bottom:0; width:3px; margin-left:-1px; border-radius:2px; background:var(--accent);
+             pointer-events:none; transition:left .12s ease; }
+  .tabmark[hidden] { display:none; }
+  .dot { width:7px; height:7px; border-radius:50%; background:#555d6a; flex:none; transition:background .3s; }
+  .dot.ok { background:var(--ok); } .dot.err { background:var(--danger); padding:0; border:0; margin:0; } .dot.wait { background:#e6a23c; }
+  /* The terminals' area. */
+  .area { position:relative; flex:1; min-height:0; margin:12px 16px 16px; border:1px solid var(--border); border-radius:10px; background:#0c0f13; overflow:hidden; }
+  body.multi .area { margin-top:0; border-top-left-radius:0; }
+  .float-add { position:absolute; top:8px; right:10px; z-index:6; width:28px; height:28px; padding:0; display:inline-flex;
+               align-items:center; justify-content:center; font-size:17px; line-height:1; color:var(--text);
+               background:transparent; border:1px solid var(--border); opacity:.28; transition:opacity .25s ease, background .25s ease, top .25s ease, right .25s ease; }
+  /* One tab split in panes: below the panes' title bars, clear of their close buttons. */
+  body.split1 .float-add { top:42px; right:16px; }
+  .float-add:hover, .float-add:focus-visible { opacity:1; background:var(--panel); }
+  body.multi .float-add { opacity:0; pointer-events:none; }
+  .tabview { position:absolute; inset:8px; opacity:0; visibility:hidden; transform:translateY(4px) scale(.995);
+             transition:opacity .22s ease, transform .22s ease, visibility 0s .22s; }
+  .tabview.on { opacity:1; visibility:visible; transform:none; transition:opacity .22s ease, transform .22s ease, visibility 0s; }
+  .pane { position:absolute; display:flex; flex-direction:column; border-radius:7px; overflow:hidden;
+          transition:left .26s ease, top .26s ease, width .26s ease, height .26s ease, border-color .2s; }
+  .tabview.instant .pane, .pane.instant { transition:none; }
+  .pane-head { display:none; }
+  .tabview.split .pane { border:1px solid var(--border); }
+  .tabview.split .pane.active { border-color:rgba(79,157,255,.7); }
+  .tabview.split .pane-head { display:flex; align-items:center; gap:7px; flex:none; height:26px; padding:0 4px 0 9px;
+                              background:#11151b; border-bottom:1px solid var(--border); font-size:12px; color:var(--muted); cursor:grab; user-select:none; }
+  .tabview.split .pane.active .pane-head { color:var(--text); }
+  .pane-title { flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
+  .pane-body { flex:1; min-height:0; padding:4px 0 0 4px; }
+  /* A lone terminal's scrollbar sits in the margin by the frame, right of
+     the corner "+", not over the text. */
+  body:not(.touch) .tabview:not(.split) .pane { overflow:visible; }
+  body:not(.touch) .tabview:not(.split) .xterm .xterm-viewport { right:-7px; }
+  .pane.dragging { opacity:.45; }
+  .gutter { position:absolute; z-index:3; }
+  .gutter.c { cursor:col-resize; } .gutter.r { cursor:row-resize; }
+  .gutter::after { content:""; position:absolute; inset:0; border-radius:3px; background:var(--accent); opacity:0; transition:opacity .15s; }
+  .gutter:hover::after, .gutter.drag::after { opacity:.55; }
+  .hint { position:absolute; z-index:5; display:flex; align-items:center; justify-content:center; text-align:center; padding:8px;
+          border:2px solid var(--accent); border-radius:9px; background:rgba(79,157,255,.14); color:var(--text); font-size:13px;
+          pointer-events:none; transition:left .14s ease, top .14s ease, width .14s ease, height .14s ease; }
+  .hint.bad { border-color:var(--danger); background:rgba(255,92,92,.12); }
+  .hint[hidden] { display:none; }
+  .drag-ghost { position:fixed; left:0; top:0; z-index:60; pointer-events:none; padding:7px 12px; border:1px solid var(--accent);
+                border-radius:8px; background:var(--panel); color:var(--text); font-size:13px; white-space:nowrap;
+                box-shadow:0 12px 30px rgba(0,0,0,.55); transition:transform .04s linear; }
+  .drag-ghost[data-hint]:not([data-hint=""])::after { content:attr(data-hint); display:block; margin-top:3px; font-size:11px; color:var(--muted); }
+  body.dnd, body.dnd * { cursor:grabbing !important; }
+  .empty { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; gap:12px; color:var(--muted); }
+  .empty[hidden] { display:none; }
+  /* The "+" menu: a terminal here, or on another machine. */
+  .addmenu { position:fixed; z-index:50; min-width:270px; max-width:340px; max-height:70vh; overflow:auto; padding:6px;
+             background:var(--panel); border:1px solid var(--border); border-radius:10px; box-shadow:0 14px 36px rgba(0,0,0,.55);
+             animation:menu-in .14s ease; }
+  .addmenu[hidden] { display:none; }
+  @keyframes menu-in { from { opacity:0; transform:translateY(-4px); } }
+  .addmenu .item { display:flex; align-items:center; gap:10px; width:100%; padding:8px 10px; border-radius:7px; text-align:left;
+                   background:transparent; color:var(--text); font-weight:400; }
+  .addmenu .item:hover:not(:disabled) { background:#12202f; }
+  .addmenu .item:disabled { opacity:.45; cursor:not-allowed; }
+  .addmenu .item b { display:block; font-weight:500; font-size:14px; }
+  .addmenu .item small { display:block; color:var(--muted); font-size:12px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; max-width:240px; }
+  .addmenu .ico { width:22px; text-align:center; color:var(--accent); font-size:16px; flex:none; }
+  .addmenu .chev { margin-left:auto; color:var(--muted); }
+  .addmenu .mlist { border-top:1px solid var(--border); margin-top:4px; padding-top:4px; }
   /* Touch screens: the page is as tall as what the on-screen keyboard leaves,
-     with a row of extra keys at the bottom, the way Termux does it. */
+     with a row of extra keys at the bottom, the way Termux does it. Tabs are
+     smaller, and there is no splitting. */
   .keys { display:none; }
-  body.touch { position:fixed; left:0; right:0; top:0; height:100%; display:flex; flex-direction:column; overflow:hidden; }
+  body.touch { position:fixed; left:0; right:0; top:0; height:100%; }
-  body.touch .wrap { flex:1; min-height:0; display:flex; width:100%; margin:0; padding:6px; }
+  body.touch .area { margin:6px; }
-  body.touch #terminal { flex:1; min-width:0; height:auto; }
+  body.touch.multi .area { margin-top:0; }
+  body.touch .tabs { padding-left:6px; padding-right:6px; }
+  body.touch.multi .tabs { padding-top:6px; max-height:38px; }
+  body.touch .tab { height:28px; font-size:12px; padding:0 2px 0 8px; gap:6px; }
+  body.touch .tab-add { width:30px; height:28px; }
+  body.touch .tabview { inset:4px; }
   body.touch .keys {
     display:grid; grid-template-columns:repeat(7, 1fr); gap:4px; flex:none;
     padding:4px 4px calc(4px + env(safe-area-inset-bottom)); background:var(--panel); border-top:1px solid var(--border);
@@ -27,22 +155,50 @@
   .keys button:active { background:var(--border); }
   .keys button.on { background:var(--accent); border-color:var(--accent); color:#fff; }
   .keys button.lock { background:var(--accent); border-color:#fff; color:#fff; }
+  /* Copy and paste on touch screens: a long press selects, this menu acts. */
+  .selmenu { position:fixed; left:50%; transform:translateX(-50%); z-index:20; display:flex; gap:7px; padding:5px;
+             background:var(--panel); border:1px solid var(--border); border-radius:8px; box-shadow:0 6px 24px rgba(0,0,0,.5); }
+  .selmenu[hidden] { display:none; }
+  .selmenu button { width:42px; height:42px; padding:0; display:inline-flex; align-items:center; justify-content:center;
+                    touch-action:manipulation; -webkit-tap-highlight-color:transparent; }
+  body.touch .area { -webkit-user-select:none; user-select:none; -webkit-touch-callout:none; }
 </style>
 </head>
 <body>
 <header class="topbar">
-  <div class="brand">LPRA · Терминал - {{.Agent.Name}} <span class="muted">({{.Agent.TerminalUser}}@{{.Agent.Hostname}})</span></div>
+  <div class="brand"><a class="home" href="/" title="К списку машин">LPRA</a> · Терминал - {{.Agent.Name}} <span class="muted">({{.Agent.TerminalUser}}@{{.Agent.Hostname}})</span></div>
   <nav>
     <a href="/">← Машины</a>
     <a href="/agents/{{.Agent.ID}}/files">Файлы</a>
     <a href="/agents/{{.Agent.ID}}/forwards">Порты</a>
     <a href="/agents/{{.Agent.ID}}/status">Статус</a>
     <a href="/agents/{{.Agent.ID}}/edit">Изменить</a>
-    <span id="status" class="muted" style="margin-left:28px">подключение…</span>
+    <span id="status" class="muted" style="margin-left:28px"></span>
   </nav>
 </header>
-<div class="wrap" style="max-width:none">
+<div class="tabs" id="tabs">
-  <div id="terminal"></div>
+  <div class="tablist" id="tablist"><div class="tabmark" id="tabmark" hidden></div></div>
+  <button type="button" class="tab-add" id="tabadd" title="Новый терминал" aria-label="Новый терминал">+</button>
+</div>
+<div class="area" id="area">
+  <button type="button" class="float-add" id="floatadd" title="Новый терминал" aria-label="Новый терминал">+</button>
+  <div class="empty" id="empty" hidden>Нет открытых терминалов<button type="button" id="emptyadd">Новый терминал</button></div>
+  <div class="hint" id="hint" hidden></div>
+</div>
+<div class="addmenu" id="addmenu" hidden></div>
+<div class="selmenu" id="selmenu" hidden>
+  <button type="button" data-a="copy" title="Копировать" aria-label="Копировать">
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="12" height="12" rx="2"/><path d="M5 15H4a1 1 0 0 1-1-1V4a1 1 0 0 1 1-1h10a1 1 0 0 1 1 1v1"/></svg>
+  </button>
+  <button type="button" class="btn ghost" data-a="paste" title="Вставить" aria-label="Вставить">
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="8" y="2" width="8" height="4" rx="1"/><path d="M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2"/></svg>
+  </button>
+  <button type="button" class="btn ghost" data-a="all" title="Выделить всё" aria-label="Выделить всё">
+    <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M5 3a2 2 0 0 0-2 2M19 3a2 2 0 0 1 2 2M21 19a2 2 0 0 1-2 2M5 21a2 2 0 0 1-2-2M9 3h1M9 21h1M14 3h1M14 21h1M3 9v1M21 9v1M3 14v1M21 14v1"/><rect x="7" y="7" width="10" height="10" rx="1"/></svg>
+  </button>
+  <button type="button" class="btn ghost close" data-a="close" title="Закрыть" aria-label="Закрыть">
+    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round"><path d="M18 6 6 18M6 6l12 12"/></svg>
+  </button>
 </div>
 <div class="keys" id="keys">
   <button type="button" data-k="esc">ESC</button>
@@ -61,116 +217,15 @@
   <button type="button" data-k="pgdn">PGDN</button>
 </div>
 
-<script src="/static/xterm.js"></script>
+<script src="{{asset "xterm.js"}}"></script>
-<script src="/static/addon-fit.js"></script>
+<script src="{{asset "addon-fit.js"}}"></script>
 <script>
-(function () {
+window.TERM_PAGE = { agent: { id: {{.Agent.ID}}, name: {{.Agent.Name}}, host: {{.Agent.Hostname}}, user: {{.Agent.TerminalUser}} } };
-  const agentID = {{.Agent.ID}};
+// Touch helpers, for the terminal being typed in: the extra keys with their
-  const statusEl = document.getElementById('status');
+// CTRL / ALT, and selecting and copying with a long press.
+window.TermKeys = (function () {
   const touch = window.matchMedia('(pointer: coarse)').matches;
-  if (touch) document.body.classList.add('touch');
+  const cur = () => window.TermPane && window.TermPane.active();
-  function setStatus(t, cls) { statusEl.textContent = t; statusEl.className = cls || ''; }
-
-  const term = new Terminal({
-    cursorBlink: true,
-    fontSize: touch ? 13 : 14,
-    fontFamily: 'ui-monospace, SFMono-Regular, Menlo, monospace',
-    theme: { background: '#0c0f13' }
-  });
-  const fit = new FitAddon.FitAddon();
-  term.loadAddon(fit);
-  term.open(document.getElementById('terminal'));
-  fit.fit();
-
-  function bytesToB64(bytes) {
-    let bin = '';
-    for (let i = 0; i < bytes.length; i++) bin += String.fromCharCode(bytes[i]);
-    return btoa(bin);
-  }
-  function b64ToBytes(b64) {
-    const bin = atob(b64);
-    const u = new Uint8Array(bin.length);
-    for (let i = 0; i < bin.length; i++) u[i] = bin.charCodeAt(i);
-    return u;
-  }
-
-  const base = '/api/panel/term/';
-  let sid = null;
-  let closed = false;
-  let connected = false;
-
-  function post(path, body) {
-    return fetch(path, {
-      method: 'POST',
-      headers: body ? { 'Content-Type': 'application/json' } : {},
-      body: body ? JSON.stringify(body) : undefined,
-      keepalive: true
-    });
-  }
-
-  async function open() {
-    try {
-      const r = await post(base + encodeURIComponent(agentID) + '/open');
-      if (!r.ok) {
-        const body = await r.text().catch(() => '');
-        setStatus('ошибка открытия (' + r.status + ')', 'st-err');
-        term.write('\r\n\x1b[31m[не удалось открыть сессию: HTTP ' + r.status + ']\x1b[0m\r\n');
-        if (body) term.write(body.slice(0, 300).replace(/\n/g, '\r\n') + '\r\n');
-        if (r.status === 404) term.write('\x1b[33mМашина не найдена на сервере - возможно, устаревший бинарник сервера без маршрута /open.\x1b[0m\r\n');
-        return;
-      }
-      const j = await r.json();
-      sid = j.session_id;
-      setStatus('ожидание агента…');
-      sendResize();
-      pollLoop();
-    } catch (e) {
-      setStatus('ошибка сети', 'st-err');
-      term.write('\r\n\x1b[31m[ошибка сети: ' + (e && e.message ? e.message : e) + ']\x1b[0m\r\n');
-    }
-  }
-
-  async function pollLoop() {
-    while (!closed && sid) {
-      let r;
-      try {
-        r = await fetch(base + sid + '/out', { cache: 'no-store' });
-      } catch (e) {
-        // transient network hiccup; brief pause then retry
-        await new Promise(res => setTimeout(res, 1000));
-        continue;
-      }
-      if (!r.ok) { finish('[соединение закрыто]'); return; }
-      const j = await r.json();
-      if (j.closed) { finish('[сессия завершена]'); return; }
-      if (j.frames) {
-        for (const f of j.frames) {
-          if (f.exit) { finish('[сессия завершена]'); return; }
-          if (f.data) {
-            if (!connected) { connected = true; setStatus('подключено', 'st-ok'); }
-            term.write(b64ToBytes(f.data));
-          }
-        }
-      }
-    }
-  }
-
-  function finish(msg) {
-    if (closed) return;
-    closed = true;
-    setStatus('соединение закрыто', 'muted');
-    term.write('\r\n\x1b[33m' + msg + '\x1b[0m\r\n');
-  }
-
-  function send(data) {
-    if (closed || !sid) return;
-    const bytes = new TextEncoder().encode(data);
-    post(base + sid + '/in', { t: 'i', d: bytesToB64(bytes) });
-  }
-  // What the keyboard types gets the CTRL / ALT of the extra keys, if armed.
-  term.onData(function (data) { send(withMods(data)); });
-
-  // --- Extra keys (touch screens) ---
   // CTRL and ALT: a tap arms the key for the next key press, a long press
   // keeps it on until tapped again.
   const mods = { ctrl: 0, alt: 0 }; // 0 off, 1 next key, 2 locked
@@ -203,7 +258,7 @@
   // xterm's modifier parameter: 1 + shift(1) + alt(2) + ctrl(4).
   const CSI = { up: 'A', down: 'B', right: 'C', left: 'D', home: 'H', end: 'F' };
   const TILDE = { pgup: 5, pgdn: 6 };
-  function keySeq(k) {
+  function keySeq(k, term) {
     const m = useMods(), p = 1 + (m.alt ? 2 : 0) + (m.ctrl ? 4 : 0);
     if (CSI[k]) {
       if (p > 1) return '\x1b[1;' + p + CSI[k];
@@ -234,41 +289,135 @@
         }
         return;
       }
-      send(keySeq(b.dataset.k));
+      const s = cur();
+      if (s) s.send(keySeq(b.dataset.k, s.term));
     });
     b.addEventListener('pointercancel', function () { if (press) { clearTimeout(press.timer); press = null; } });
     b.addEventListener('contextmenu', function (e) { e.preventDefault(); });
   });
 
-  function sendResize() {
+  // --- Selecting and copying on touch screens ---
-    if (closed || !sid) return;
+  // xterm.js has no touch selection of its own. A long press selects the word
-    post(base + sid + '/in', { t: 'r', cols: term.cols, rows: term.rows });
+  // under the finger and dragging on from there stretches the selection; a
+  // menu then copies it or pastes. A plain tap or swipe still types and scrolls.
+  const menu = document.getElementById('selmenu');
+  let selecting = false;
+  function showMenu() {
+    const s = cur();
+    const keys = document.getElementById('keys').getBoundingClientRect();
+    menu.style.top = '';
+    menu.style.bottom = (window.innerHeight - keys.top + 14) + 'px';
+    menu.querySelector('[data-a="copy"]').disabled = !(s && s.term.hasSelection());
+    menu.hidden = false;
   }
-  function refit() {
+  function selectionChanged(s) {
-    if (touch && window.visualViewport) {
+    if (!touch || s !== cur()) return;
-      // Follow the visible area, so the extra keys sit right above the
+    if (s.term.hasSelection()) showMenu();
-      // on-screen keyboard.
+    else if (!selecting) menu.hidden = true;
-      const vv = window.visualViewport;
-      document.body.style.top = vv.offsetTop + 'px';
-      document.body.style.height = vv.height + 'px';
   }
-    fit.fit();
+  if (touch) {
+    const box = document.getElementById('area');
+    let timer = null, start = null, anchor = null;
+    function cellAt(term, el, x, y) {
+      const r = el.querySelector('.xterm-screen').getBoundingClientRect();
+      const col = Math.max(0, Math.min(term.cols - 1, Math.floor((x - r.left) / (r.width / term.cols))));
+      const row = Math.max(0, Math.min(term.rows - 1, Math.floor((y - r.top) / (r.height / term.rows))));
+      return { col: col, row: row + term.buffer.active.viewportY };
     }
-  window.addEventListener('resize', refit);
+    function selectWord(term, c) {
-  if (touch && window.visualViewport) {
+      const line = term.buffer.active.getLine(c.row);
-    window.visualViewport.addEventListener('resize', refit);
+      const text = line ? line.translateToString(false) : '';
-    window.visualViewport.addEventListener('scroll', refit);
+      const word = ch => ch && !/\s/.test(ch);
+      let a = c.col, b = c.col;
+      if (word(text[c.col])) {
+        while (a > 0 && word(text[a - 1])) a--;
+        while (b < text.length - 1 && word(text[b + 1])) b++;
       }
-  refit();
+      term.select(a, c.row, b - a + 1);
-  term.onResize(sendResize);
+      anchor = { from: c.row * term.cols + a, to: c.row * term.cols + b };
+    }
+    function stretch(term, c) {
+      const p = c.row * term.cols + c.col;
+      const from = Math.min(anchor.from, p), to = Math.max(anchor.to, p);
+      term.select(from % term.cols, Math.floor(from / term.cols), to - from + 1);
+    }
+    function hideMenu() { menu.hidden = true; const s = cur(); if (s) s.term.clearSelection(); anchor = null; }
+    box.addEventListener('touchstart', function (e) {
+      if (e.touches.length !== 1 || !e.target.closest('.pane-body')) { clearTimeout(timer); return; }
+      const t = e.touches[0];
+      start = { x: t.clientX, y: t.clientY };
+      if (!menu.hidden) hideMenu();
+      clearTimeout(timer);
+      timer = setTimeout(function () {
+        const s = cur();
+        if (!s) return;
+        selecting = true;
+        selectWord(s.term, cellAt(s.term, s.el, start.x, start.y));
+        showMenu();
+        if (navigator.vibrate) navigator.vibrate(15);
+      }, 450);
+    }, { passive: true, capture: true });
+    box.addEventListener('touchmove', function (e) {
+      const t = e.touches[0], s = cur();
+      if (selecting && s) {
+        e.preventDefault(); // no scrolling while the selection stretches
+        e.stopPropagation();
+        stretch(s.term, cellAt(s.term, s.el, t.clientX, t.clientY));
+      } else if (start && Math.hypot(t.clientX - start.x, t.clientY - start.y) > 8) {
+        clearTimeout(timer); // a swipe: let it scroll
+      }
+    }, { passive: false, capture: true });
+    box.addEventListener('touchend', function (e) {
+      clearTimeout(timer);
+      if (!selecting) return;
+      selecting = false;
+      e.preventDefault(); // no tap: the keyboard stays as it was
+      e.stopPropagation();
+      showMenu();
+    }, { passive: false, capture: true });
+    box.addEventListener('contextmenu', function (e) { e.preventDefault(); });
 
-  window.addEventListener('pagehide', function () {
+    const statusEl = document.getElementById('status');
-    if (sid) navigator.sendBeacon(base + sid + '/close');
+    function flash(t, cls) {
+      statusEl.textContent = t; statusEl.className = cls;
+      setTimeout(function () { const s = cur(); if (s) s.setState(s.state, s.text); }, 1500);
+    }
+    function copyText(text) {
+      if (navigator.clipboard && window.isSecureContext) return navigator.clipboard.writeText(text);
+      // Plain http: the old way, through a field that is there for a moment.
+      const ta = document.createElement('textarea');
+      ta.value = text;
+      ta.style.cssText = 'position:fixed;top:0;left:0;opacity:0';
+      document.body.appendChild(ta);
+      ta.select();
+      const ok = document.execCommand('copy');
+      ta.remove();
+      return ok ? Promise.resolve() : Promise.reject(new Error('нет доступа к буферу'));
+    }
+    menu.addEventListener('pointerdown', function (e) { e.preventDefault(); });
+    menu.addEventListener('click', function (e) {
+      const b = e.target.closest('button'), s = cur();
+      if (!b || !s) return;
+      const a = b.dataset.a;
+      if (a === 'copy') {
+        const text = s.term.getSelection();
+        hideMenu();
+        copyText(text).then(function () { flash('скопировано', 'st-ok'); }, function (err) { flash('не скопировалось: ' + err.message, 'st-err'); });
+      } else if (a === 'paste') {
+        hideMenu();
+        if (!navigator.clipboard || !navigator.clipboard.readText) { flash('вставка: браузер не даёт буфер', 'st-err'); return; }
+        navigator.clipboard.readText().then(function (t) { if (t) s.term.paste(t); }, function () { flash('вставка: нет доступа к буферу', 'st-err'); });
+      } else if (a === 'all') {
+        s.term.selectAll();
+        showMenu();
+      } else {
+        hideMenu();
+      }
     });
-
+  }
-  term.focus();
+  return { withMods: withMods, selectionChanged: selectionChanged };
-  open();
 })();
 </script>
+<script src="{{asset "terminal.js"}}"></script>
 </body>
 </html>

internal/server/wsagent.go

@@ -0,0 +1,203 @@
+package server
+
+import (
+	"context"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/coder/websocket"
+	"github.com/coder/websocket/wsjson"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// An agent's WebSocket carries what its long polls would: control messages
+// pushed the moment they are queued, and the input and output of its
+// terminal and http-forward sessions, without a request per keystroke. Tasks,
+// file transfers and the speed test stay on plain requests.
+
+// wsPing keeps the connection alive through proxies that drop quiet ones
+// (Cloudflare after 100 s).
+const wsPing = 20 * time.Second
+
+// wsAgents are the agents connected by WebSocket now, for the panel to show.
+type wsAgents struct {
+	mu sync.Mutex
+	m  map[string]*websocket.Conn
+}
+
+// set records the agent's connection, closing one it had before.
+func (c *wsAgents) set(id string, conn *websocket.Conn) {
+	c.mu.Lock()
+	if c.m == nil {
+		c.m = map[string]*websocket.Conn{}
+	}
+	old := c.m[id]
+	c.m[id] = conn
+	c.mu.Unlock()
+	if old != nil {
+		old.Close(websocket.StatusGoingAway, "replaced")
+	}
+}
+
+func (c *wsAgents) drop(id string, conn *websocket.Conn) {
+	c.mu.Lock()
+	if c.m[id] == conn {
+		delete(c.m, id)
+	}
+	c.mu.Unlock()
+}
+
+// On reports whether the agent is on its WebSocket now.
+func (c *wsAgents) On(id string) bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	return c.m[id] != nil
+}
+
+// transportOf is the agent's setting as stored, "auto" when unset.
+func (s *Server) transportOf(agentID string) string {
+	if a, err := s.db.GetAgent(agentID); err == nil && a != nil && a.Transport != "" {
+		return a.Transport
+	}
+	return proto.TransportAuto
+}
+
+// GET /api/agent/ws - the agent's WebSocket. Refused (409) when the agent is
+// set to long polling.
+func (s *Server) handleAgentWS(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	if a.Transport == proto.TransportLP {
+		w.Header().Set(proto.TransportHeader, proto.TransportLP)
+		http.Error(w, "long polling only", http.StatusConflict)
+		return
+	}
+	if v := r.Header.Get("X-Agent-Version"); v != "" {
+		_ = s.db.TouchAgentInfo(a.ID, v, firstNonEmpty(r.Header.Get("X-Agent-User"), a.RunUser))
+	}
+	conn, err := websocket.Accept(w, r, &websocket.AcceptOptions{CompressionMode: websocket.CompressionDisabled})
+	if err != nil {
+		return
+	}
+	s.viaDirectA.Store(a.ID, s.viaDirect(r))
+	conn.SetReadLimit(4 << 20)
+	ctx, cancel := context.WithCancel(r.Context())
+	defer cancel()
+	s.wsAgents.set(a.ID, conn)
+	defer s.wsAgents.drop(a.ID, conn)
+	defer conn.CloseNow()
+
+	send := func(m proto.WSMsg) error {
+		wctx, wcancel := context.WithTimeout(ctx, 30*time.Second)
+		defer wcancel()
+		return wsjson.Write(wctx, conn, m)
+	}
+	cfg := func() proto.WSMsg {
+		return proto.WSMsg{T: "cfg", Tunnel: s.tunnelAdvert(), Transport: s.transportOf(a.ID), Fallback: s.db.DirectAddress(), Main: s.db.HostAddress()}
+	}
+	if send(cfg()) != nil {
+		return
+	}
+
+	// Control: what a poll would get, as soon as it is queued. An idle round
+	// sends the settings, which doubles as a sign of life.
+	go func() {
+		defer cancel()
+		for ctx.Err() == nil {
+			msg := s.hub.WaitControl(ctx.Done(), a.ID, pollHold)
+			if ctx.Err() != nil {
+				return
+			}
+			_ = s.db.TouchAgent(a.ID)
+			out := proto.WSMsg{T: "ctrl", Ctrl: &msg}
+			if msg.Type == proto.CtrlIdle {
+				out = cfg()
+			}
+			if send(out) != nil {
+				return
+			}
+			if out.Transport == proto.TransportLP {
+				conn.Close(websocket.StatusNormalClosure, "long polling only")
+				return
+			}
+		}
+	}()
+	go func() {
+		t := time.NewTicker(wsPing)
+		defer t.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				pctx, pcancel := context.WithTimeout(ctx, 15*time.Second)
+				err := conn.Ping(pctx)
+				pcancel()
+				if err != nil {
+					cancel()
+					return
+				}
+			}
+		}
+	}()
+
+	subs := map[string]bool{}
+	for {
+		var m proto.WSMsg
+		if err := wsjson.Read(ctx, conn, &m); err != nil {
+			return
+		}
+		switch m.T {
+		case "sub":
+			if subs[m.SID] {
+				continue
+			}
+			sess := s.hub.Session(m.SID)
+			if sess == nil || sess.AgentID != a.ID {
+				_ = send(proto.WSMsg{T: "gone", SID: m.SID})
+				continue
+			}
+			subs[m.SID] = true
+			go s.pumpSession(ctx, sess, send)
+		case "out":
+			sess := s.hub.Session(m.SID)
+			if sess == nil || sess.AgentID != a.ID || m.Out == nil {
+				_ = send(proto.WSMsg{T: "gone", SID: m.SID})
+				continue
+			}
+			if !sess.PushOut(*m.Out) {
+				_ = send(proto.WSMsg{T: "gone", SID: m.SID})
+				continue
+			}
+			if m.Out.Exit {
+				sess.close()
+				time.AfterFunc(pollHold, func() { s.hub.CloseSession(sess.ID) })
+			}
+		}
+	}
+}
+
+// pumpSession sends a session's input down the WebSocket as it comes. Input
+// taken just as the connection ends goes back to the session, for the agent's
+// long poll to collect.
+func (s *Server) pumpSession(ctx context.Context, sess *Session, send func(proto.WSMsg) error) {
+	for ctx.Err() == nil {
+		frames, alive := sess.PollIn(pollHold)
+		if !alive {
+			_ = send(proto.WSMsg{T: "gone", SID: sess.ID})
+			return
+		}
+		if len(frames) == 0 {
+			continue
+		}
+		if ctx.Err() != nil || send(proto.WSMsg{T: "in", SID: sess.ID, Frames: frames}) != nil {
+			sess.Unpoll(frames)
+			return
+		}
+	}
+}