feat: files up to 512 MB as streams, a code editor with highlighting and find/replace, media preview, hex editing; touch selection in the terminal (0.0.7)

2026-10-14 15:52:38 +03:00
1 parent 3e46116a9b
commit e1f5595afc
@@ -1 +1 @@
-0.0.6
+0.0.7
@@ -21,8 +21,9 @@ 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.
-    client_max_body_size 64m;
+    # Files go through the panel as plain request bodies, up to 512 MB each
+    # way (an upload from the browser, a download sent up by the agent).
+    client_max_body_size 520m;

    location / {
        proxy_pass http://127.0.0.1:8091;
@@ -39,7 +40,7 @@ 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_send_timeout  120s;
+        proxy_read_timeout  300s;
+        proxy_send_timeout  300s;
    }
 }
@@ -48,6 +48,7 @@ type state struct {
 type Agent struct {
 	cfg       Config
 	http      *http.Client
+	stream    *http.Client
 	state     state
 	pollCount int

@@ -81,6 +82,8 @@ 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},
 	}
 }

@@ -0,0 +1,137 @@
+package agent
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"syscall"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// File transfers that do not fit a task's JSON: the bytes go as a plain HTTP
+// body through a stream the server holds open for the browser on the other
+// end, so a file is never held whole in memory.
+
+func (a *Agent) streamURL(id string) string { return a.cfg.Host + "/api/agent/fs/stream/" + id }
+
+// doFSUpload 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) doFSUpload(ctx context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSStreamArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if args.Size > proto.FSFileCap {
+		return proto.TaskResult{Error: "файл больше 512 МБ"}
+	}
+	dir, base := filepath.Split(args.Path)
+	if dir == "" {
+		dir = "."
+	}
+	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())
+		}
+	}()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, a.streamURL(args.Stream), nil)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	a.authHeaders(req)
+	resp, err := a.stream.Do(req)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return proto.TaskResult{Error: errStatus(resp.StatusCode).Error()}
+	}
+	n, err := io.Copy(tmp, io.LimitReader(resp.Body, proto.FSFileCap+1))
+	if err != nil {
+		return proto.TaskResult{Error: "загрузка прервана: " + err.Error()}
+	}
+	if n > proto.FSFileCap {
+		return proto.TaskResult{Error: "файл больше 512 МБ"}
+	}
+	if args.Size >= 0 && n != args.Size {
+		return proto.TaskResult{Error: fmt.Sprintf("загрузка прервана: пришло %d из %d байт", n, args.Size)}
+	}
+	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 {
+		if info.IsDir() {
+			return proto.TaskResult{Error: "это каталог"}
+		}
+		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": n})
+	return proto.TaskResult{OK: true, Data: data}
+}
+
+// doFSGet sends a file to the browser that asked for it.
+func (a *Agent) doFSGet(ctx context.Context, env proto.TaskEnvelope) proto.TaskResult {
+	var args proto.FSStreamArgs
+	if err := json.Unmarshal(env.Args, &args); err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	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"}
+	}
+	if info.Size() > proto.FSFileCap {
+		return proto.TaskResult{Error: "файл больше 512 МБ"}
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, a.streamURL(args.Stream), io.LimitReader(f, info.Size()))
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	req.ContentLength = info.Size()
+	req.Header.Set("X-Size", strconv.FormatInt(info.Size(), 10))
+	a.authHeaders(req)
+	resp, err := a.stream.Do(req)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	io.Copy(io.Discard, resp.Body)
+	resp.Body.Close()
+	if resp.StatusCode != http.StatusNoContent {
+		return proto.TaskResult{Error: "браузер не дочитал файл"}
+	}
+	data, _ := json.Marshal(map[string]any{"path": args.Path, "size": info.Size()})
+	return proto.TaskResult{OK: true, Data: data}
+}
@@ -22,6 +22,10 @@ func (a *Agent) runTask(ctx context.Context, taskID string) {
 		res = a.doUpdate()
 	case proto.TaskSysSpeed:
 		res = a.doSpeed(ctx, env)
+	case proto.TaskFSUpload:
+		res = a.doFSUpload(ctx, env)
+	case proto.TaskFSGet:
+		res = a.doFSGet(ctx, env)
 	default:
 		res = a.execTask(env)
 	}
@@ -85,6 +85,8 @@ 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
+	TaskFSUpload   = "fs.upload"   // write a file from a stream the agent fetches (0.0.7+)
+	TaskFSGet      = "fs.get"      // send a file as a stream the agent posts (0.0.7+)

 	TaskSysUpdate  = "sys.update"  // download the latest agent binary and restart
 	TaskSysUsers   = "sys.users"   // report the agent's user and the login-capable users
@@ -97,6 +99,19 @@ const (
 // 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 as a stream (TaskFSUpload,
+// TaskFSGet).
+const FSFileCap = 512 << 20
+
+// FSStreamArgs are the arguments of TaskFSUpload and TaskFSGet: the file, and
+// the stream on the server that carries its bytes (GET it for an upload, POST
+// to it for a download). Size is the upload's length, -1 when not known.
+type FSStreamArgs struct {
+	Path   string `json:"path"`
+	Stream string `json:"stream"`
+	Size   int64  `json:"size"`
+}
+
 // TaskEnvelope is what the agent fetches for a task id.
 type TaskEnvelope struct {
 	Type string          `json:"type"`
@@ -0,0 +1,343 @@
+package server
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"path"
+	"strconv"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/x-grk/longpolling-remote-access/internal/proto"
+)
+
+// Files go between the browser and the agent as plain HTTP bodies, joined on
+// the server by a pipe: the browser's upload is the body of the agent's GET,
+// the agent's POST is the body of the browser's download. Nothing is held
+// whole in memory and nothing is base64.
+
+// fsStreamTimeout bounds one file transfer, however slow the links.
+const fsStreamTimeout = 2 * time.Hour
+
+// fsLegacyCap is the most an agent that predates the streams can take in or
+// hand over: the file goes base64 inside a task then.
+const fsLegacyCap = 32 << 20
+
+// fsStream is one file on its way.
+type fsStream struct {
+	agentID string
+	r       *io.PipeReader
+	w       *io.PipeWriter
+	size    int64         // bytes to come, -1 when not known
+	ready   chan struct{} // download: closed when the agent starts sending
+	once    sync.Once
+	taken   atomic.Bool // the agent has come for it
+}
+
+// start marks the download as under way with its size; false when it already
+// is.
+func (st *fsStream) start(size int64) bool {
+	ok := false
+	st.once.Do(func() {
+		st.size = size
+		close(st.ready)
+		ok = true
+	})
+	return ok
+}
+
+type fsStreams struct {
+	mu sync.Mutex
+	m  map[string]*fsStream
+}
+
+func (c *fsStreams) open(agentID string, size int64) (string, *fsStream) {
+	st := &fsStream{agentID: agentID, size: size, ready: make(chan struct{})}
+	st.r, st.w = io.Pipe()
+	id := randToken()[:24]
+	c.mu.Lock()
+	if c.m == nil {
+		c.m = map[string]*fsStream{}
+	}
+	c.m[id] = st
+	c.mu.Unlock()
+	return id, st
+}
+
+// get returns the stream if it belongs to the agent asking.
+func (c *fsStreams) get(id, agentID string) *fsStream {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if st := c.m[id]; st != nil && st.agentID == agentID {
+		return st
+	}
+	return nil
+}
+
+func (c *fsStreams) drop(id string) {
+	c.mu.Lock()
+	st := c.m[id]
+	delete(c.m, id)
+	c.mu.Unlock()
+	if st != nil {
+		st.r.CloseWithError(io.ErrClosedPipe)
+		st.w.CloseWithError(io.ErrClosedPipe)
+	}
+}
+
+// waitTask runs a task on the agent and waits for its result, or for the
+// browser to leave.
+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
+}
+
+// POST /api/panel/agents/{id}/fs/upload?path=... - write a file; the request
+// body is the file, passed on to the agent as it arrives.
+func (s *Server) handleFSUpload(w http.ResponseWriter, r *http.Request) {
+	agentID, p := r.PathValue("id"), r.URL.Query().Get("path")
+	if !s.fsAgent(w, agentID, true) {
+		return
+	}
+	if p == "" {
+		writeJSON(w, proto.TaskResult{Error: "не указан путь"})
+		return
+	}
+	if r.ContentLength > proto.FSFileCap {
+		writeJSON(w, proto.TaskResult{Error: "файл больше 512 МБ"})
+		return
+	}
+	body := http.MaxBytesReader(w, r.Body, proto.FSFileCap)
+	id, st := s.fsStreams.open(agentID, r.ContentLength)
+	defer s.fsStreams.drop(id)
+	copied := make(chan struct{})
+	go func() {
+		defer close(copied)
+		_, err := io.Copy(st.w, body)
+		st.w.CloseWithError(err) // nil: the reader sees the end of the file
+	}()
+
+	args := proto.FSStreamArgs{Path: p, Stream: id, Size: r.ContentLength}
+	res, err := s.waitTask(r.Context(), agentID, proto.TaskFSUpload, args, fsStreamTimeout)
+	if err == nil && unknownOp(res) && !st.taken.Load() {
+		res = s.legacyUpload(r.Context(), agentID, p, st.r)
+	}
+	// Stop the copy and let it end before the handler does: the body is not
+	// to be read after that.
+	st.r.CloseWithError(io.ErrClosedPipe)
+	<-copied
+	if err != nil {
+		writeJSON(w, proto.TaskResult{Error: err.Error()})
+		return
+	}
+	writeJSON(w, res)
+}
+
+// legacyUpload writes a file through an agent that predates the streams.
+func (s *Server) legacyUpload(ctx context.Context, agentID, p string, body io.Reader) proto.TaskResult {
+	data, err := io.ReadAll(io.LimitReader(body, fsLegacyCap+1))
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	if len(data) > fsLegacyCap {
+		return proto.TaskResult{Error: "клиент принимает файлы до 32 МБ - обновите его"}
+	}
+	args := proto.FSWriteArgs{Path: p, Data: base64.StdEncoding.EncodeToString(data)}
+	res, err := s.waitTask(ctx, agentID, proto.TaskFSWrite, args, fsTaskTimeout)
+	if err != nil {
+		return proto.TaskResult{Error: err.Error()}
+	}
+	return res
+}
+
+// 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",
+}
+
+// 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.
+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")
+	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,
+// streamed from the agent as it reads it. 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
+	}
+	id, st := s.fsStreams.open(agentID, -1)
+	defer s.fsStreams.drop(id)
+	raw, _ := json.Marshal(proto.FSStreamArgs{Path: p, Stream: id, Size: -1})
+	taskID, ch := s.hub.CreateTask(agentID, proto.TaskFSGet, raw)
+	defer s.hub.DiscardTask(taskID)
+
+	select {
+	case <-st.ready:
+		fileHeaders(w, p, inline)
+		if st.size >= 0 {
+			w.Header().Set("Content-Length", strconv.FormatInt(st.size, 10))
+		}
+		if _, err := io.Copy(w, st.r); err != nil {
+			// Cut the response off, so the browser does not take a part of
+			// the file for all of it.
+			st.r.CloseWithError(err)
+			panic(http.ErrAbortHandler)
+		}
+	case res := <-ch:
+		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)
+	case <-r.Context().Done():
+	case <-time.After(fsTaskTimeout):
+		http.Error(w, "таймаут ожидания агента", http.StatusGatewayTimeout)
+	}
+}
+
+// legacyDownload gets a file from an agent that predates the streams.
+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)
+}
+
+// GET /api/agent/fs/stream/{sid} - the file the browser is uploading, for the
+// agent to write.
+func (s *Server) handleAgentFSStreamGet(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	st := s.fsStreams.get(r.PathValue("sid"), a.ID)
+	if st == nil || !st.taken.CompareAndSwap(false, true) {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	w.Header().Set("Content-Type", "application/octet-stream")
+	w.Header().Set("X-Accel-Buffering", "no")
+	if st.size >= 0 {
+		w.Header().Set("Content-Length", strconv.FormatInt(st.size, 10))
+	}
+	if _, err := io.Copy(w, st.r); err != nil {
+		// The browser broke off: cut the response, so the agent does not
+		// take a part of the file for all of it.
+		panic(http.ErrAbortHandler)
+	}
+}
+
+// POST /api/agent/fs/stream/{sid} - the file the browser asked for, sent by
+// the agent. 204 once the browser has it all.
+func (s *Server) handleAgentFSStreamPost(w http.ResponseWriter, r *http.Request) {
+	a := s.authenticateAgent(r)
+	if a == nil {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+	st := s.fsStreams.get(r.PathValue("sid"), a.ID)
+	if st == nil {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	size, err := strconv.ParseInt(r.Header.Get("X-Size"), 10, 64)
+	if err != nil {
+		size = -1
+	}
+	if !st.taken.CompareAndSwap(false, true) || !st.start(size) {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	_, err = io.Copy(st.w, http.MaxBytesReader(w, r.Body, proto.FSFileCap))
+	st.w.CloseWithError(err)
+	if err != nil {
+		http.Error(w, "gone", http.StatusGone)
+		return
+	}
+	w.WriteHeader(http.StatusNoContent)
+}
@@ -1,11 +1,8 @@
 package server

 import (
-	"encoding/base64"
-	"encoding/json"
 	"io"
 	"net/http"
-	"path"
 	"time"

 	"github.com/x-grk/longpolling-remote-access/internal/proto"
@@ -73,44 +70,3 @@ 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)
-	}
-}
@@ -56,6 +56,7 @@ 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
+	fsStreams fsStreams   // files on their way between a browser and an agent
 }

 // New builds the server, parsing embedded templates.
@@ -229,6 +230,7 @@ func (s *Server) Handler() http.Handler {

 	// 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.handleFSUpload))
 	mux.Handle("POST /api/panel/agents/{id}/fs/{op}", s.requireAdmin(s.handleFSOp))

 	// Machine status (admin).
@@ -257,6 +259,8 @@ 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/stream/{sid}", s.handleAgentFSStreamGet)
+	mux.HandleFunc("POST /api/agent/fs/stream/{sid}", s.handleAgentFSStreamPost)

 	return s.logRequests(mux)
 }
@@ -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.
@@ -0,0 +1 @@
+.CodeMirror{font-family:monospace;height:300px;color:#000;direction:ltr}.CodeMirror-lines{padding:4px 0}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{padding:0 4px}.CodeMirror-gutter-filler,.CodeMirror-scrollbar-filler{background-color:#fff}.CodeMirror-gutters{border-right:1px solid #ddd;background-color:#f7f7f7;white-space:nowrap}.CodeMirror-linenumber{padding:0 3px 0 5px;min-width:20px;text-align:right;color:#999;white-space:nowrap}.CodeMirror-guttermarker{color:#000}.CodeMirror-guttermarker-subtle{color:#999}.CodeMirror-cursor{border-left:1px solid #000;border-right:none;width:0}.CodeMirror div.CodeMirror-secondarycursor{border-left:1px solid silver}.cm-fat-cursor .CodeMirror-cursor{width:auto;border:0!important;background:#7e7}.cm-fat-cursor div.CodeMirror-cursors{z-index:1}.cm-fat-cursor .CodeMirror-line::selection,.cm-fat-cursor .CodeMirror-line>span::selection,.cm-fat-cursor .CodeMirror-line>span>span::selection{background:0 0}.cm-fat-cursor .CodeMirror-line::-moz-selection,.cm-fat-cursor .CodeMirror-line>span::-moz-selection,.cm-fat-cursor .CodeMirror-line>span>span::-moz-selection{background:0 0}.cm-fat-cursor{caret-color:transparent}@-moz-keyframes blink{50%{background-color:transparent}}@-webkit-keyframes blink{50%{background-color:transparent}}@keyframes blink{50%{background-color:transparent}}.cm-tab{display:inline-block;text-decoration:inherit}.CodeMirror-rulers{position:absolute;left:0;right:0;top:-50px;bottom:0;overflow:hidden}.CodeMirror-ruler{border-left:1px solid #ccc;top:0;bottom:0;position:absolute}.cm-s-default .cm-header{color:#00f}.cm-s-default .cm-quote{color:#090}.cm-negative{color:#d44}.cm-positive{color:#292}.cm-header,.cm-strong{font-weight:700}.cm-em{font-style:italic}.cm-link{text-decoration:underline}.cm-strikethrough{text-decoration:line-through}.cm-s-default .cm-keyword{color:#708}.cm-s-default .cm-atom{color:#219}.cm-s-default .cm-number{color:#164}.cm-s-default .cm-def{color:#00f}.cm-s-default .cm-variable-2{color:#05a}.cm-s-default .cm-type,.cm-s-default .cm-variable-3{color:#085}.cm-s-default .cm-comment{color:#a50}.cm-s-default .cm-string{color:#a11}.cm-s-default .cm-string-2{color:#f50}.cm-s-default .cm-meta{color:#555}.cm-s-default .cm-qualifier{color:#555}.cm-s-default .cm-builtin{color:#30a}.cm-s-default .cm-bracket{color:#997}.cm-s-default .cm-tag{color:#170}.cm-s-default .cm-attribute{color:#00c}.cm-s-default .cm-hr{color:#999}.cm-s-default .cm-link{color:#00c}.cm-s-default .cm-error{color:red}.cm-invalidchar{color:red}.CodeMirror-composing{border-bottom:2px solid}div.CodeMirror span.CodeMirror-matchingbracket{color:#0b0}div.CodeMirror span.CodeMirror-nonmatchingbracket{color:#a22}.CodeMirror-matchingtag{background:rgba(255,150,0,.3)}.CodeMirror-activeline-background{background:#e8f2ff}.CodeMirror{position:relative;overflow:hidden;background:#fff}.CodeMirror-scroll{overflow:scroll!important;margin-bottom:-50px;margin-right:-50px;padding-bottom:50px;height:100%;outline:0;position:relative;z-index:0}.CodeMirror-sizer{position:relative;border-right:50px solid transparent}.CodeMirror-gutter-filler,.CodeMirror-hscrollbar,.CodeMirror-scrollbar-filler,.CodeMirror-vscrollbar{position:absolute;z-index:6;display:none;outline:0}.CodeMirror-vscrollbar{right:0;top:0;overflow-x:hidden;overflow-y:scroll}.CodeMirror-hscrollbar{bottom:0;left:0;overflow-y:hidden;overflow-x:scroll}.CodeMirror-scrollbar-filler{right:0;bottom:0}.CodeMirror-gutter-filler{left:0;bottom:0}.CodeMirror-gutters{position:absolute;left:0;top:0;min-height:100%;z-index:3}.CodeMirror-gutter{white-space:normal;height:100%;display:inline-block;vertical-align:top;margin-bottom:-50px}.CodeMirror-gutter-wrapper{position:absolute;z-index:4;background:0 0!important;border:none!important}.CodeMirror-gutter-background{position:absolute;top:0;bottom:0;z-index:4}.CodeMirror-gutter-elt{position:absolute;cursor:default;z-index:4}.CodeMirror-gutter-wrapper ::selection{background-color:transparent}.CodeMirror-gutter-wrapper ::-moz-selection{background-color:transparent}.CodeMirror-lines{cursor:text;min-height:1px}.CodeMirror pre.CodeMirror-line,.CodeMirror pre.CodeMirror-line-like{-moz-border-radius:0;-webkit-border-radius:0;border-radius:0;border-width:0;background:0 0;font-family:inherit;font-size:inherit;margin:0;white-space:pre;word-wrap:normal;line-height:inherit;color:inherit;z-index:2;position:relative;overflow:visible;-webkit-tap-highlight-color:transparent;-webkit-font-variant-ligatures:contextual;font-variant-ligatures:contextual}.CodeMirror-wrap pre.CodeMirror-line,.CodeMirror-wrap pre.CodeMirror-line-like{word-wrap:break-word;white-space:pre-wrap;word-break:normal}.CodeMirror-linebackground{position:absolute;left:0;right:0;top:0;bottom:0;z-index:0}.CodeMirror-linewidget{position:relative;z-index:2;padding:.1px}.CodeMirror-rtl pre{direction:rtl}.CodeMirror-code{outline:0}.CodeMirror-gutter,.CodeMirror-gutters,.CodeMirror-linenumber,.CodeMirror-scroll,.CodeMirror-sizer{-moz-box-sizing:contentLine truncated
@@ -0,0 +1,27 @@
+/* CodeMirror 5.65.16 (MIT, see LICENSE) with the addons and language modes the file editor uses, joined into one file. */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).CodeMirror=t()}(this,function(){"use strict";var e=navigator.userAgent,l=navigator.platform,d=/gecko\/\d/i.test(e),s=/MSIE \d/.test(e),a=/Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(e),u=/Edge\/(\d+)/.exec(e),w=s||a||u,v=w&&(s?document.documentMode||6:+(u||a)[1]),x=!u&&/WebKit\//.test(e),s=x&&/Qt\/\d+\.\d+/.test(e),m=!u&&/Chrome\/(\d+)/.exec(e),V=m&&+m[1],K=/Opera\//.test(e),j=/Apple Computer/.test(navigator.vendor),c=/Mac OS X 1\d\D([8-9]|\d\d)\D/.test(e),X=/PhantomJS/.test(e),Y=j&&(/Mobile\/\w+/.test(e)||2<navigator.maxTouchPoints),$=/Android/.test(e),_=Y||$||/webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(e),C=Y||/Mac/.test(l),q=/\bCrOS\b/.test(e),a=/win/i.test(l),u=K&&e.match(/Version\/(\d*\.\d*)/),Z=((u=u&&Number(u[1]))&&15<=u&&(x=!(K=!1)),C&&(s||K&&(null==u||u<12.11))),Q=d||w&&9<=v;function J(e){return new RegExp("(^|\\s)"+e+"(?:$|\\s)\\s*")}var ee=function(e,t){var n,r=e.className,t=J(t).exec(r);t&&(n=r.slice(t.index+t[0].length),e.className=r.slice(0,t.index)+(n?t[1]+n:""))};function te(e){for(var t=e.childNodes.length;0<t;--t)e.removeChild(e.firstChild);return e}function y(e,t){return te(e).appendChild(t)}function M(e,t,n,r){var i=document.createElement(e);if(n&&(i.className=n),r&&(i.style.cssText=r),"string"==typeof t)i.appendChild(document.createTextNode(t));else if(t)for(var o=0;o<t.length;++o)i.appendChild(t[o]);return i}function ne(e,t,n,r){e=M(e,t,n,r);return e.setAttribute("role","presentation"),e}function re(e,t){if(3==t.nodeType&&(t=t.parentNode),e.contains)return e.contains(t);do{if((t=11==t.nodeType?t.host:t)==e)return!0}while(t=t.parentNode)}function N(e){var t,n=e.ownerDocument||e;try{t=e.activeElement}catch(e){t=n.body||null}for(;t&&t.shadowRoot&&t.shadowRoot.activeElement;)t=t.shadowRoot.activeElement;return t}function ie(e,t){var n=e.className;J(t).test(n)||(e.className+=(n?" 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truncated
+!function(e){"object"==typeof exports&&"object"==typeof module?e(require("../../lib/codemirror")):"function"==typeof define&&define.amd?define(["../../lib/codemirror"],e):e(CodeMirror)}(function(e){"use strict";e.defineMode("cmake",function(){var i=/({)?[a-zA-Z0-9_]+(})?/;function r(e,n){for(var t,i,r=!1;!e.eol()&&(t=e.next())!=n.pending;){if("$"===t&&"\\"!=i&&'"'==n.pending){r=!0;break}i=t}return r&&e.backUp(1),t==n.pending?n.continueString=!1:n.continueString=!0,"string"}return{startState:function(){var e={inDefinition:!1,inInclude:!1,continueString:!1,pending:!1};return e},token:function(e,n){return e.eatSpace()?null:(n=n,"$"===(t=(e=e).next())?e.match(i)?"variable-2":"variable":n.continueString?(e.backUp(1),r(e,n)):e.match(/(\s+)?\w+\(/)||e.match(/(\s+)?\w+\ \(/)?(e.backUp(1),"def"):"#"==t?(e.skipToEnd(),"comment"):"'"==t||'"'==t?(n.pending=t,r(e,n)):"("==t||")"==t?"bracket":t.match(/[0-9]/)?"number":(e.eatWhile(/[\w-]/),null));var t}}}),e.defineMIME("text/x-cmake","cmake")});;
@@ -5,6 +5,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Файлы · {{.Agent.Name}} - LPRA</title>
 <link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="/static/codemirror/codemirror.css">
 <style>
  .fm-bar { display:flex; gap:8px; align-items:center; flex-wrap:wrap; margin-bottom:12px; }
  /* Normalize buttons and the file <label> button so they line up on one row. */
@@ -56,16 +57,79 @@
    table.fm td, table.fm th { padding:7px 4px; }
    .ic { margin-right:4px; }
    .fm-bar input.fm-path { flex:1 1 100%; order:-1; }
-    textarea#edit { font-size:13px; }
  }
  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); }
  .dlg-h { padding:14px 18px; border-bottom:1px solid var(--border); display:flex; align-items:center; gap:10px; }
  .dlg-b { padding:16px 18px; }
-  textarea#edit { width:100%; height:52vh; background:#0c0f13; color:var(--text);
-                  border:1px solid var(--border); border-radius:8px; padding:12px;
-                  font-family:ui-monospace,Menlo,monospace; font-size:13px; }
+  /* File viewer: the code editor, a picture / video / sound, or the hex editor. */
+  #viewer { max-width:1100px; }
+  #viewer .dlg-h { flex-wrap:wrap; }
+  .vpath { flex:1; min-width:0; overflow:hidden; white-space:nowrap; text-overflow:ellipsis;
+           font-family:ui-monospace,Menlo,monospace; font-size:13px; font-weight:600; }
+  .vmsg { width:100%; order:9; font-size:12px; }
+  .vbody { padding:0; }
+  #vcode .CodeMirror { height:70vh; font-family:ui-monospace,SFMono-Regular,Menlo,monospace; font-size:13px; }
+  .vmedia { display:flex; align-items:center; justify-content:center; min-height:200px; max-height:75vh; padding:16px;
+            background:#0c0f13 repeating-conic-gradient(#151a21 0 25%, #0c0f13 0 50%) 0 0/20px 20px; border-radius:0 0 12px 12px; }
+  .vmedia img, .vmedia video { max-width:100%; max-height:calc(75vh - 32px); object-fit:contain; }
+  .vmedia audio { width:min(100%, 520px); }
+  /* Find and replace, over the editor. */
+  .find { display:flex; flex-direction:column; gap:6px; padding:8px 12px; border-bottom:1px solid var(--border); background:var(--panel); }
+  .find .fr { display:flex; gap:6px; align-items:center; }
+  .find input { flex:1; min-width:0; height:30px; padding:4px 10px; font-size:13px; font-family:ui-monospace,Menlo,monospace; }
+  .find input.bad { border-color:var(--danger); }
+  .find button { height:30px; padding:0 10px; font-size:13px; flex:none; }
+  .find button.tg { background:transparent; border:1px solid var(--border); color:var(--muted); font-family:ui-monospace,Menlo,monospace; }
+  .find button.tg.on { border-color:var(--accent); color:var(--text); background:#12202f; }
+  .find .cnt { flex:none; min-width:64px; text-align:center; color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
+  /* Hex editor: offset, 16 bytes, the same as text. Only the rows in sight are drawn. */
+  .hexed { position:relative; height:70vh; overflow:auto; outline:none; background:#0c0f13;
+           font:13px/20px ui-monospace,SFMono-Regular,Menlo,monospace; }
+  .hexed .hx-rows { position:absolute; left:0; right:0; padding:0 12px; }
+  .hx-r { display:flex; gap:18px; height:20px; white-space:pre; }
+  .hx-o { color:var(--muted); }
+  .hx-b i, .hx-a i { font-style:normal; cursor:text; }
+  .hx-b i { margin-right:6px; }
+  .hx-b i:nth-child(8) { margin-right:14px; }
+  .hx-a { color:#9aa4b2; }
+  .hx-r i.ch { color:#ffcb6b; }
+  .hx-r i.cur { background:var(--accent); color:#fff; border-radius:2px; }
+  .hx-r i.cur2 { outline:1px solid var(--accent); border-radius:2px; }
+  /* Editor colours, in the panel's palette. */
+  .cm-s-lpra.CodeMirror { background:#0c0f13; color:#d7dce4; }
+  .cm-s-lpra .CodeMirror-gutters { background:#0c0f13; border-right:1px solid var(--border); }
+  .cm-s-lpra .CodeMirror-linenumber { color:#4b5563; }
+  .cm-s-lpra .CodeMirror-cursor { border-left:2px solid #e6e9ef; }
+  .cm-s-lpra .CodeMirror-selected, .cm-s-lpra.CodeMirror-focused .CodeMirror-selected { background:rgba(79,157,255,.28); }
+  .cm-s-lpra .CodeMirror-line::selection, .cm-s-lpra .CodeMirror-line > span::selection { background:rgba(79,157,255,.28); }
+  .cm-s-lpra span.cm-keyword { color:#c792ea; }
+  .cm-s-lpra span.cm-def { color:#82aaff; }
+  .cm-s-lpra span.cm-variable-2, .cm-s-lpra span.cm-variable-3, .cm-s-lpra span.cm-type { color:#ffcb6b; }
+  .cm-s-lpra span.cm-builtin { color:#ffcb6b; }
+  .cm-s-lpra span.cm-string, .cm-s-lpra span.cm-string-2 { color:#c3e88d; }
+  .cm-s-lpra span.cm-number, .cm-s-lpra span.cm-atom { color:#f78c6c; }
+  .cm-s-lpra span.cm-comment { color:#6b7686; font-style:italic; }
+  .cm-s-lpra span.cm-meta, .cm-s-lpra span.cm-qualifier { color:#89ddff; }
+  .cm-s-lpra span.cm-operator { color:#89ddff; }
+  .cm-s-lpra span.cm-property { color:#82aaff; }
+  .cm-s-lpra span.cm-tag { color:#f07178; }
+  .cm-s-lpra span.cm-attribute { color:#ffcb6b; }
+  .cm-s-lpra span.cm-header { color:#82aaff; font-weight:600; }
+  .cm-s-lpra span.cm-link { color:#89ddff; text-decoration:underline; }
+  .cm-s-lpra span.cm-error { color:#ff5c5c; }
+  .cm-s-lpra span.cm-positive { color:#37c871; }
+  .cm-s-lpra span.cm-negative { color:#ff5c5c; }
+  .cm-s-lpra .CodeMirror-matchingbracket { color:#fff !important; outline:1px solid #4f9dff; }
+  .cm-s-lpra .cm-searching { background:rgba(255,203,107,.32); border-radius:2px; }
+  @media (max-width: 640px) {
+    #vcode .CodeMirror, .hexed { height:calc(100vh - 220px); }
+    .hexed { font-size:11px; }
+    .hx-r { gap:10px; }
+    .hx-b i { margin-right:3px; }
+    .hx-b i:nth-child(8) { margin-right:8px; }
+  }
  .toast { position:fixed; bottom:18px; left:50%; transform:translateX(-50%);
           background:#2a2f3a; border:1px solid var(--border); border-radius:8px;
           padding:10px 16px; font-size:14px; opacity:0; transition:opacity .2s; pointer-events:none; }
@@ -116,13 +180,33 @@

 <dialog id="viewer">
  <div class="dlg-h">
-    <strong id="vname" style="flex:1; overflow:hidden; text-overflow:ellipsis"></strong>
-    <button class="btn small" id="save" style="display:none">Сохранить</button>
+    <strong class="vpath" dir="rtl"><bdi id="vname"></bdi></strong>
+    <button class="btn ghost small" id="vtext" hidden>Редактировать</button>
+    <button class="btn ghost small" id="vhex" hidden>Редактировать бинарно</button>
+    <button class="btn small" id="save" hidden>Сохранить</button>
    <button class="btn ghost small" id="closev">Закрыть</button>
+    <div class="vmsg muted" id="vmsg"></div>
  </div>
-  <div class="dlg-b">
-    <div id="vmsg" class="muted" style="margin-bottom:8px; font-size:13px"></div>
-    <textarea id="edit" spellcheck="false"></textarea>
+  <div class="vbody">
+    <div class="find" id="find" hidden>
+      <div class="fr">
+        <input type="text" id="fq" placeholder="Найти" spellcheck="false" autocomplete="off">
+        <span class="cnt" id="fcnt"></span>
+        <button type="button" class="tg" id="fcase" title="Учитывать регистр">Aa</button>
+        <button type="button" class="tg" id="fre" title="Регулярное выражение">.*</button>
+        <button type="button" class="btn ghost" id="fprev" title="Предыдущее (Shift+Enter)">↑</button>
+        <button type="button" class="btn ghost" id="fnext" title="Следующее (Enter)">↓</button>
+        <button type="button" class="btn ghost" id="fclose" title="Закрыть (Esc)">×</button>
+      </div>
+      <div class="fr" id="frow2">
+        <input type="text" id="frep" placeholder="Заменить на" spellcheck="false" autocomplete="off">
+        <button type="button" class="btn ghost" id="frepone">Заменить</button>
+        <button type="button" class="btn ghost" id="frepall">Все</button>
+      </div>
+    </div>
+    <div id="vcode" hidden></div>
+    <div class="vmedia" id="vmedia" hidden></div>
+    <div class="hexed" id="vhexed" tabindex="0" hidden><div id="hxsp"></div><div class="hx-rows" id="hxrows"></div></div>
  </div>
 </dialog>

@@ -136,6 +220,7 @@

 <div class="toast" id="toast"></div>

+<script src="/static/codemirror/codemirror.js"></script>
 <script>
 (function () {
  const agentID = {{.Agent.ID}};
@@ -154,6 +239,7 @@
  const SVG = '<svg width="15" height="15" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">';
  const ICON_DL   = SVG + '<path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7 10 12 15 17 10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>';
  const ICON_MV   = SVG + '<polyline points="5 9 2 12 5 15"/><polyline points="9 5 12 2 15 5"/><polyline points="15 19 12 22 9 19"/><polyline points="19 9 22 12 19 15"/><line x1="2" y1="12" x2="22" y2="12"/><line x1="12" y1="2" x2="12" y2="22"/></svg>';
+  const ICON_UNZIP = SVG + '<rect x="2" y="3" width="20" height="5" rx="1"/><path d="M4 8v11a2 2 0 0 0 2 2h2"/><path d="M20 8v11a2 2 0 0 1-2 2h-2"/><path d="m9 15 3-3 3 3"/><path d="M12 12v9"/></svg>';
  const ICON_DEL  = SVG + '<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>';
  let cwd = '/';
  let entries = [];
@@ -162,7 +248,6 @@
  const $ = id => document.getElementById(id);
  const toast = (msg, err) => { const t=$('toast'); t.textContent=msg; t.className='toast show'+(err?' err':''); setTimeout(()=>t.className='toast',2200); };
  const b64ToBytes = b64 => { const bin=atob(b64); const u=new Uint8Array(bin.length); for(let i=0;i<bin.length;i++)u[i]=bin.charCodeAt(i); return u; };
-  const bytesToB64 = bytes => { let s=''; const CH=0x8000; for(let i=0;i<bytes.length;i+=CH) s+=String.fromCharCode.apply(null, bytes.subarray(i,i+CH)); return btoa(s); };
  const join = (dir, name) => (dir.endsWith('/') ? dir : dir+'/') + name;
  const parent = p => { if(p==='/'||p==='') return '/'; const i=p.replace(/\/+$/,'').lastIndexOf('/'); return i<=0 ? '/' : p.slice(0,i); };
  const fmtSize = n => { if(n<1024)return n+' B'; if(n<1048576)return (n/1024).toFixed(1)+' K'; if(n<1073741824)return (n/1048576).toFixed(1)+' M'; return (n/1073741824).toFixed(1)+' G'; };
@@ -198,7 +283,7 @@
        '<td class="sz c-sz">'+(e.is_dir?'':fmtSize(e.size))+'</td>' +
        '<td class="sz mt">'+fmtTime(e.mtime)+'</td>' +
        '<td><div class="act">' +
-          (isZip?'<button class="btn ghost small" data-act="unzip">unzip</button>':'') +
+          (isZip?'<button class="btn ghost small icon" data-act="unzip" title="Распаковать сюда">'+ICON_UNZIP+'</button>':'') +
          (e.is_dir?'':'<a class="btn ghost small icon" title="Скачать" href="'+dlHref+'" download>'+ICON_DL+'</a>') +
          '<button class="btn ghost small icon" data-act="ren" title="Переместить / переименовать">'+ICON_MV+'</button>' +
          '<button class="btn danger small icon" data-act="del" title="Удалить">'+ICON_DEL+'</button>' +
@@ -220,30 +305,398 @@
    $('zipsel').disabled = !n; $('delsel').disabled = !n;
  }

+  // ---------- File viewer ----------
+  const fsURL = (what, path) => '/api/panel/agents/' + encodeURIComponent(agentID) + '/fs/' + what + '?path=' + encodeURIComponent(path);
+  // Writes a file as it is, with no base64: the request body is the file.
+  async function putFile(path, body) {
+    setBusy(true);
+    try {
+      const r = await fetch(fsURL('upload', path), {method: 'POST', headers: {'Content-Type': 'application/octet-stream'}, body});
+      return (r.headers.get('Content-Type') || '').startsWith('application/json') ? await r.json() : {ok: false, error: 'HTTP ' + r.status};
+    } catch (e) { return {ok: false, error: 'ошибка сети'}; }
+    finally { setBusy(false); }
+  }
+
+  const IMG = /\.(png|jpe?g|gif|webp|bmp|ico|avif|svg)$/i, VID = /\.(mp4|m4v|webm|ogv|mov)$/i, AUD = /\.(mp3|wav|ogg|oga|m4a|aac|flac|opus)$/i;
+  const HEX_CAP = 64 * 1024 * 1024; // what the hex editor takes in memory
+
+  // Highlighting by the file's name, then its extension, then its #! line.
+  const BY_EXT = {
+    py:'python', pyw:'python', go:'go', c:'text/x-csrc', h:'text/x-csrc', cc:'text/x-c++src', cpp:'text/x-c++src', cxx:'text/x-c++src',
+    hpp:'text/x-c++src', hh:'text/x-c++src', java:'text/x-java', kt:'text/x-kotlin', kts:'text/x-kotlin', cs:'text/x-csharp', scala:'text/x-scala',
+    js:'javascript', mjs:'javascript', cjs:'javascript', jsx:'javascript', ts:'text/typescript', tsx:'text/typescript', json:'application/json',
+    css:'css', scss:'text/x-scss', less:'text/x-less', html:'htmlmixed', htm:'htmlmixed', vue:'htmlmixed', xml:'xml', svg:'xml', plist:'xml', xsd:'xml',
+    php:'php', sh:'shell', bash:'shell', zsh:'shell', ksh:'shell', yaml:'yaml', yml:'yaml', md:'markdown', markdown:'markdown', sql:'sql',
+    toml:'toml', ini:'properties', cfg:'properties', conf:'properties', cnf:'properties', env:'properties', properties:'properties',
+    service:'properties', timer:'properties', socket:'properties', mount:'properties', lua:'lua', rs:'rust', diff:'diff', patch:'diff',
+    rb:'ruby', pl:'perl', pm:'perl', cmake:'cmake'
+  };
+  const BY_NAME = {
+    'dockerfile':'dockerfile', 'containerfile':'dockerfile', 'makefile':'shell', '.bashrc':'shell', '.bash_profile':'shell', '.profile':'shell',
+    '.zshrc':'shell', '.zprofile':'shell', '.env':'properties', 'cmakelists.txt':'cmake', 'gemfile':'ruby', 'rakefile':'ruby',
+    'nginx.conf':'nginx', 'go.mod':'go', 'requirements.txt':'properties'
+  };
+  function modeFor(path, text) {
+    const name = path.slice(path.lastIndexOf('/') + 1).toLowerCase();
+    if (BY_NAME[name]) return BY_NAME[name];
+    if (/^dockerfile\./.test(name)) return 'dockerfile';
+    if (/\/nginx\//.test(path) && /\.conf$/.test(name)) return 'nginx';
+    const dot = name.lastIndexOf('.');
+    const ext = dot > 0 ? name.slice(dot + 1) : '';
+    if (BY_EXT[ext]) return BY_EXT[ext];
+    const bang = /^#!.*?\b(\w+)\s*$/.exec(text.slice(0, 200).split('\n')[0]);
+    if (bang) return {sh:'shell', bash:'shell', zsh:'shell', dash:'shell', python:'python', python3:'python', node:'javascript', ruby:'ruby', perl:'perl'}[bang[1]] || null;
+    return null;
+  }
+  const modeName = m => !m ? 'текст' : m.replace(/^(text|application)\/(x-)?/, '').replace('c++src', 'c++').replace('csrc', 'c');
+
+  let cm = null;
+  function editor() {
+    if (cm) return cm;
+    cm = CodeMirror($('vcode'), {
+      theme: 'lpra', lineNumbers: true, matchBrackets: true, indentUnit: 4, tabSize: 4,
+      extraKeys: {
+        'Ctrl-F': () => openFind(), 'Cmd-F': () => openFind(),
+        'Ctrl-H': () => openFind(true), 'Cmd-Alt-F': () => openFind(true), 'Shift-Ctrl-F': () => openFind(true),
+        'Ctrl-S': () => $('save').click(), 'Cmd-S': () => $('save').click(),
+        'Ctrl-G': () => findStep(1), 'Cmd-G': () => findStep(1), 'Shift-Ctrl-G': () => findStep(-1), 'Shift-Cmd-G': () => findStep(-1),
+        'Tab': c => c.somethingSelected() ? c.indentSelection('add') : c.replaceSelection(c.getOption('indentWithTabs') ? '\t' : ' '.repeat(c.getOption('indentUnit')))
+      }
+    });
+    cm.on('changes', () => { V.dirty = !cm.isClean(V.clean); if (F.open) refreshFind(); });
+    return cm;
+  }
+
+  // What the viewer has open now.
+  const V = { path: '', kind: '', dirty: false, clean: 0 };
+  function showPane(which) {
+    for (const [id, k] of [['vcode', 'code'], ['vmedia', 'media'], ['vhexed', 'hex']]) $(id).hidden = which !== k;
+    if (which !== 'code') closeFind();
+  }
+  function setButtons(o) {
+    $('vtext').hidden = !o.text; $('vhex').hidden = !o.hex; $('save').hidden = !o.save;
+  }
+  function openViewer(path) {
+    V.path = path; V.dirty = false;
+    $('vname').textContent = path;
+    $('vname').parentElement.title = path;
+    if (!$('viewer').open) $('viewer').showModal();
+  }
+
  async function view(e) {
-    const r = await api('read', {path: join(cwd, e.name)});
+    const path = join(cwd, e.name);
+    if (IMG.test(e.name) || VID.test(e.name) || AUD.test(e.name)) return viewMedia(path, e.size);
+    const r = await api('read', {path});
    if (!r.ok) { toast(r.error || 'ошибка', true); return; }
-    const d = r.data;
-    $('vname').textContent = e.name;
-    const ta = $('edit'); const save = $('save'); const msg = $('vmsg');
-    if (d.binary) {
-      ta.value = '(бинарный файл, просмотр недоступен)'; ta.readOnly = true; save.style.display='none';
-      msg.textContent = 'Размер: '+fmtSize(d.size);
-    } else {
-      ta.value = new TextDecoder().decode(b64ToBytes(d.content));
+    if (r.data.binary) return viewHex(path, r.data.size);
+    viewText(path, r.data);
+  }
+
+  function viewText(path, d) {
+    openViewer(path);
+    V.kind = 'code';
+    const text = new TextDecoder().decode(b64ToBytes(d.content));
    const editable = d.size <= EDIT_LIMIT && !d.truncated;
-      ta.readOnly = !editable;
-      save.style.display = editable ? '' : 'none';
-      msg.textContent = 'Размер: '+fmtSize(d.size) + (d.truncated?' · показано первые '+fmtSize(EDIT_LIMIT):'') + (editable?' · редактируемо':' · только чтение (больше '+fmtSize(EDIT_LIMIT)+')');
-      save.onclick = async () => {
-        const bytes = new TextEncoder().encode(ta.value);
-        const w = await api('write', {path: join(cwd, e.name), data: bytesToB64(bytes)});
-        if (w.ok) { toast('сохранено'); $('viewer').close(); load(cwd); } else toast(w.error||'ошибка', true);
+    const c = editor();
+    showPane('code');
+    const mode = modeFor(path, text);
+    c.setOption('mode', mode);
+    c.setOption('indentWithTabs', mode === 'go' || /(^|\/)makefile$/i.test(path));
+    c.setOption('readOnly', !editable);
+    c.setValue(text);
+    c.clearHistory();
+    V.clean = c.changeGeneration();
+    V.dirty = false;
+    setButtons({hex: true, save: editable});
+    $('frow2').hidden = !editable;
+    $('vmsg').textContent = fmtSize(d.size) + ' · ' + modeName(mode) +
+      (d.truncated ? ' · показаны первые ' + fmtSize(EDIT_LIMIT) : '') + (editable ? '' : ' · только чтение (больше ' + fmtSize(EDIT_LIMIT) + ')') +
+      ' · Ctrl/Cmd+F - поиск и замена';
+    $('save').onclick = async () => {
+      const w = await putFile(path, new TextEncoder().encode(c.getValue()));
+      if (w.ok) { V.clean = c.changeGeneration(); V.dirty = false; toast('сохранено'); load(cwd); } else toast(w.error || 'ошибка', true);
+    };
+    $('vhex').onclick = () => { if (!V.dirty || confirm('Несохранённые изменения пропадут. Открыть бинарно?')) viewHex(path, d.size); };
+    setTimeout(() => { c.refresh(); c.focus(); c.setCursor(0, 0); }, 0);
+  }
+
+  function viewMedia(path, size) {
+    openViewer(path);
+    V.kind = 'media';
+    showPane('media');
+    const box = $('vmedia');
+    box.innerHTML = '';
+    const el = document.createElement(VID.test(path) ? 'video' : AUD.test(path) ? 'audio' : 'img');
+    if (el.tagName !== 'IMG') { el.controls = true; el.preload = 'metadata'; }
+    else el.alt = path;
+    el.onerror = () => { $('vmsg').textContent = fmtSize(size) + ' · браузер не смог это показать'; };
+    el.src = fsURL('download', path) + '&inline=1';
+    box.appendChild(el);
+    setButtons({text: /\.svg$/i.test(path), hex: true});
+    $('vmsg').textContent = fmtSize(size);
+    $('vtext').onclick = async () => {
+      const r = await api('read', {path});
+      if (!r.ok) { toast(r.error || 'ошибка', true); return; }
+      stopMedia();
+      viewText(path, r.data);
+    };
+    $('vhex').onclick = () => { stopMedia(); viewHex(path, size); };
+  }
+  function stopMedia() {
+    const el = $('vmedia').firstChild;
+    if (el && el.pause) el.pause();
+    if (el) el.removeAttribute('src');
+    $('vmedia').innerHTML = '';
+  }
+
+  // ---------- Hex editor ----------
+  // Overwrite in place: a hex digit sets half a byte, a character in the text
+  // column sets a byte. Changed bytes stay marked until saved.
+  const H = { data: null, orig: null, cur: 0, nib: 0, side: 'hex', changed: 0 };
+  const ROW = 20;
+  async function viewHex(path, size) {
+    if (size > HEX_CAP) { toast('для бинарной правки файл слишком большой (больше ' + fmtSize(HEX_CAP) + ')', true); return; }
+    openViewer(path);
+    V.kind = 'hex';
+    showPane('hex');
+    setButtons({save: true});
+    $('vmsg').textContent = 'загрузка…';
+    $('hxrows').innerHTML = '';
+    let buf;
+    try {
+      setBusy(true);
+      const r = await fetch(fsURL('download', path));
+      if (!r.ok) throw new Error((await r.text()).trim() || ('HTTP ' + r.status));
+      buf = new Uint8Array(await r.arrayBuffer());
+    } catch (err) {
+      $('vmsg').textContent = 'не удалось прочитать: ' + err.message;
+      return;
+    } finally { setBusy(false); }
+    if (V.path !== path || V.kind !== 'hex') return;
+    H.data = buf; H.orig = buf.slice(); H.cur = 0; H.nib = 0; H.side = 'hex'; H.changed = 0;
+    $('hxsp').style.height = (Math.ceil(buf.length / 16) * ROW + 8) + 'px';
+    $('vhexed').scrollTop = 0;
+    drawHex(); hexInfo();
+    $('vhexed').focus();
+    $('save').onclick = async () => {
+      const w = await putFile(path, H.data);
+      if (w.ok) { H.orig = H.data.slice(); H.changed = 0; V.dirty = false; drawHex(); hexInfo(); toast('сохранено'); load(cwd); }
+      else toast(w.error || 'ошибка', true);
    };
  }
-    $('viewer').showModal();
+  const hx2 = b => (b < 16 ? '0' : '') + b.toString(16).toUpperCase();
+  function drawHex() {
+    const box = $('vhexed'), n = H.data.length;
+    const first = Math.max(0, Math.floor(box.scrollTop / ROW) - 2);
+    const last = Math.min(Math.ceil(n / 16), first + Math.ceil(box.clientHeight / ROW) + 5);
+    let html = '';
+    for (let r = first; r < last; r++) {
+      let hb = '', ha = '';
+      for (let i = r * 16; i < r * 16 + 16; i++) {
+        if (i >= n) { hb += '<i>  </i>'; continue; }
+        const b = H.data[i], ch = b !== H.orig[i] ? 'ch' : '';
+        const at = i === H.cur;
+        hb += '<i data-i="' + i + '" class="' + ch + (at ? (H.side === 'hex' ? ' cur' : ' cur2') : '') + '">' + hx2(b) + '</i>';
+        const c = b >= 32 && b < 127 ? String.fromCharCode(b) : '.';
+        ha += '<i data-i="' + i + '" class="' + ch + (at ? (H.side === 'txt' ? ' cur' : ' cur2') : '') + '">' + (c === '<' ? '&lt;' : c === '&' ? '&amp;' : c) + '</i>';
      }
-  $('closev').onclick = () => $('viewer').close();
+      html += '<div class="hx-r"><span class="hx-o">' + (r * 16).toString(16).toUpperCase().padStart(8, '0') +
+        '</span><span class="hx-b">' + hb + '</span><span class="hx-a">' + ha + '</span></div>';
+    }
+    const rows = $('hxrows');
+    rows.style.top = (first * ROW + 4) + 'px';
+    rows.innerHTML = html;
+  }
+  function hexInfo() {
+    $('vmsg').textContent = fmtSize(H.data.length) + ' · смещение 0x' + H.cur.toString(16).toUpperCase() + ' (' + H.cur + ')' +
+      (H.changed ? ' · изменено байт: ' + H.changed : '') + ' · Tab - между hex и текстом';
+  }
+  function hexMove(to) {
+    if (!H.data.length) return;
+    H.cur = Math.max(0, Math.min(H.data.length - 1, to)); H.nib = 0;
+    const box = $('vhexed'), y = Math.floor(H.cur / 16) * ROW;
+    if (y < box.scrollTop) box.scrollTop = y;
+    else if (y + ROW > box.scrollTop + box.clientHeight - 8) box.scrollTop = y + ROW - box.clientHeight + 8;
+    drawHex(); hexInfo();
+  }
+  function hexSet(i, b) {
+    const was = H.data[i] !== H.orig[i];
+    H.data[i] = b;
+    H.changed += (H.data[i] !== H.orig[i] ? 1 : 0) - (was ? 1 : 0);
+    V.dirty = H.changed > 0;
+  }
+  $('vhexed').addEventListener('scroll', () => { if (V.kind === 'hex' && H.data) drawHex(); });
+  $('vhexed').addEventListener('mousedown', ev => {
+    const t = ev.target.closest('i[data-i]');
+    if (!t) return;
+    H.side = t.parentElement.classList.contains('hx-a') ? 'txt' : 'hex';
+    hexMove(+t.dataset.i);
+  });
+  $('vhexed').addEventListener('keydown', ev => {
+    if (!H.data || !H.data.length) return;
+    const mod = ev.ctrlKey || ev.metaKey, page = 16 * Math.max(1, Math.floor($('vhexed').clientHeight / ROW) - 1);
+    const moves = { ArrowLeft: -1, ArrowRight: 1, ArrowUp: -16, ArrowDown: 16, PageUp: -page, PageDown: page };
+    if (mod && (ev.key === 's' || ev.key === 'S' || ev.code === 'KeyS')) { ev.preventDefault(); $('save').click(); return; }
+    if (mod) return;
+    if (moves[ev.key] !== undefined) { ev.preventDefault(); hexMove(H.cur + moves[ev.key]); return; }
+    if (ev.key === 'Home') { ev.preventDefault(); hexMove(H.cur - H.cur % 16); return; }
+    if (ev.key === 'End') { ev.preventDefault(); hexMove(H.cur - H.cur % 16 + 15); return; }
+    if (ev.key === 'Tab') { ev.preventDefault(); H.side = H.side === 'hex' ? 'txt' : 'hex'; H.nib = 0; drawHex(); return; }
+    if (ev.key.length !== 1) return;
+    if (H.side === 'hex') {
+      const h = parseInt(ev.key, 16);
+      if (isNaN(h)) return;
+      ev.preventDefault();
+      const b = H.data[H.cur];
+      if (H.nib === 0) { hexSet(H.cur, (h << 4) | (b & 15)); H.nib = 1; drawHex(); hexInfo(); }
+      else { hexSet(H.cur, (b & 0xf0) | h); hexMove(H.cur + 1); }
+    } else {
+      const code = ev.key.charCodeAt(0);
+      if (code < 32 || code > 126) return;
+      ev.preventDefault();
+      hexSet(H.cur, code); hexMove(H.cur + 1);
+    }
+  });
+
+  // ---------- Find and replace ----------
+  const F = { open: false, overlay: null, caseS: false, re: false };
+  function findRe(global) {
+    const q = $('fq').value;
+    if (!q) return null;
+    try {
+      return new RegExp(F.re ? q : q.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), (global ? 'g' : '') + (F.caseS ? '' : 'i') + 'm');
+    } catch (e) { return null; }
+  }
+  function openFind(replace) {
+    if (V.kind !== 'code' || !cm) return;
+    F.open = true;
+    $('find').hidden = false;
+    const sel = cm.getSelection();
+    if (sel && sel.indexOf('\n') < 0) $('fq').value = sel;
+    const input = replace && !$('frow2').hidden ? $('frep') : $('fq');
+    input.focus();
+    input.select();
+    refreshFind();
+    cm.refresh();
+  }
+  function closeFind() {
+    if (!F.open) return;
+    F.open = false;
+    $('find').hidden = true;
+    if (cm && F.overlay) { cm.removeOverlay(F.overlay); F.overlay = null; }
+    if (cm) { cm.refresh(); if (V.kind === 'code') cm.focus(); }
+  }
+  // Marks every match and counts them; the one selected shows as "n из всех".
+  function refreshFind() {
+    if (F.overlay) { cm.removeOverlay(F.overlay); F.overlay = null; }
+    const q = $('fq').value, re = findRe(true);
+    $('fq').classList.toggle('bad', !!q && !re);
+    if (!re) { $('fcnt').textContent = q ? 'ошибка' : ''; return; }
+    F.overlay = { token: stream => {
+      re.lastIndex = stream.pos;
+      const m = re.exec(stream.string);
+      if (m && m.index === stream.pos && m[0].length) { stream.pos += m[0].length; return 'searching'; }
+      if (m && m.index > stream.pos) { stream.pos = m.index; return null; }
+      if (m) { stream.next(); return null; }
+      stream.skipToEnd(); return null;
+    } };
+    cm.addOverlay(F.overlay);
+    countFind();
+  }
+  function countFind() {
+    const re = findRe(false);
+    if (!re) return;
+    let n = 0, at = 0;
+    const from = cm.getCursor('from'), to = cm.getCursor('to');
+    const cur = cm.getSearchCursor(re, {line: 0, ch: 0});
+    while (cur.findNext() && n < 9999) {
+      if (CodeMirror.cmpPos(cur.from(), cur.to()) === 0) break;
+      n++;
+      if (!at && CodeMirror.cmpPos(cur.from(), from) === 0 && CodeMirror.cmpPos(cur.to(), to) === 0) at = n;
+    }
+    $('fcnt').textContent = n ? (at ? at + ' из ' + n : n + (n >= 9999 ? '+' : '')) : 'нет';
+  }
+  function findStep(dir, fromStart) {
+    const re = findRe(false);
+    if (!re || !cm) return false;
+    let cur = cm.getSearchCursor(re, fromStart ? {line: 0, ch: 0} : dir > 0 ? cm.getCursor('to') : cm.getCursor('from'));
+    let ok = dir > 0 ? cur.findNext() : cur.findPrevious();
+    if (!ok) { // go round the end
+      cur = cm.getSearchCursor(re, dir > 0 ? {line: 0, ch: 0} : {line: cm.lastLine(), ch: cm.getLine(cm.lastLine()).length});
+      ok = dir > 0 ? cur.findNext() : cur.findPrevious();
+    }
+    if (!ok || CodeMirror.cmpPos(cur.from(), cur.to()) === 0) { countFind(); return false; }
+    cm.setSelection(cur.from(), cur.to());
+    cm.scrollIntoView({from: cur.from(), to: cur.to()}, 80);
+    countFind();
+    return true;
+  }
+  // $1.. and $& stand for the groups of a regular expression's match.
+  function replacement(m) {
+    const r = $('frep').value;
+    return F.re && m ? r.replace(/\$(\d+|&)/g, (_, g) => g === '&' ? m[0] : (m[+g] || '')) : r;
+  }
+  function replaceOne() {
+    const re = findRe(false);
+    if (!re || cm.getOption('readOnly')) return;
+    const from = cm.getCursor('from'), to = cm.getCursor('to');
+    const cur = cm.getSearchCursor(re, from);
+    const m = cur.findNext();
+    if (m && CodeMirror.cmpPos(cur.from(), from) === 0 && CodeMirror.cmpPos(cur.to(), to) === 0) {
+      cur.replace(replacement(m));
+      cm.setCursor(cur.to());
+    }
+    findStep(1);
+  }
+  function replaceAll() {
+    const re = findRe(false);
+    if (!re || cm.getOption('readOnly')) return;
+    let n = 0;
+    cm.operation(() => {
+      const cur = cm.getSearchCursor(re, {line: 0, ch: 0});
+      let m;
+      while ((m = cur.findNext()) && n < 100000) {
+        if (CodeMirror.cmpPos(cur.from(), cur.to()) === 0) break;
+        cur.replace(replacement(m));
+        n++;
+      }
+    });
+    toast(n ? 'заменено: ' + n : 'совпадений нет', !n);
+    countFind();
+  }
+  $('fq').addEventListener('input', () => { refreshFind(); findStep(1, true); });
+  $('fq').addEventListener('keydown', ev => {
+    if (ev.key === 'Enter') { ev.preventDefault(); findStep(ev.shiftKey ? -1 : 1); }
+    else if (ev.key === 'Escape') { ev.preventDefault(); closeFind(); }
+  });
+  $('frep').addEventListener('keydown', ev => {
+    if (ev.key === 'Enter') { ev.preventDefault(); ev.ctrlKey || ev.metaKey ? replaceAll() : replaceOne(); }
+    else if (ev.key === 'Escape') { ev.preventDefault(); closeFind(); }
+  });
+  $('fcase').onclick = () => { F.caseS = !F.caseS; $('fcase').classList.toggle('on', F.caseS); refreshFind(); };
+  $('fre').onclick = () => { F.re = !F.re; $('fre').classList.toggle('on', F.re); refreshFind(); };
+  $('fnext').onclick = () => findStep(1);
+  $('fprev').onclick = () => findStep(-1);
+  $('fclose').onclick = closeFind;
+  $('frepone').onclick = replaceOne;
+  $('frepall').onclick = replaceAll;
+  // Ctrl/Cmd+F anywhere in the viewer opens this search, not the browser's.
+  $('viewer').addEventListener('keydown', ev => {
+    if ((ev.ctrlKey || ev.metaKey) && !ev.altKey && (ev.key === 'f' || ev.key === 'F' || ev.code === 'KeyF') && V.kind === 'code') {
+      ev.preventDefault(); openFind();
+    }
+  });
+
+  // Closing: Esc first closes the search; unsaved changes are asked about.
+  function closeViewer() {
+    if (V.dirty && !confirm('Есть несохранённые изменения. Закрыть без сохранения?')) return;
+    stopMedia(); closeFind();
+    H.data = H.orig = null;
+    V.kind = ''; V.dirty = false;
+    $('viewer').close();
+  }
+  $('viewer').addEventListener('cancel', ev => { ev.preventDefault(); if (F.open) closeFind(); else closeViewer(); });
+  $('closev').onclick = closeViewer;

  async function del(e) {
    if (e.is_dir) {
@@ -341,16 +794,19 @@
  $('updlg-close').onclick = () => $('updlg').close();

  // XHR rather than fetch: it reports how much of the request has gone out.
-  function writeWithProgress(path, bytes, onFrac) {
+  // The body is the file itself, which the panel passes on to the client as
+  // it comes, so the bar follows the whole way.
+  const UP_CAP = 512 * 1024 * 1024;
+  function writeWithProgress(path, file, onFrac) {
    return new Promise(resolve => {
      const x = new XMLHttpRequest();
-      x.open('POST', '/api/panel/agents/' + encodeURIComponent(agentID) + '/fs/write');
-      x.setRequestHeader('Content-Type', 'application/json');
+      x.open('POST', fsURL('upload', path));
+      x.setRequestHeader('Content-Type', 'application/octet-stream');
      x.upload.onprogress = ev => { if (ev.lengthComputable) onFrac(ev.loaded / ev.total); };
      x.upload.onload = () => onFrac(1);
      x.onload = () => { try { resolve(JSON.parse(x.responseText)); } catch (e) { resolve({ok: false, error: 'HTTP ' + x.status}); } };
      x.onerror = () => resolve({ok: false, error: 'ошибка сети'});
-      x.send(JSON.stringify({path, data: bytesToB64(bytes)}));
+      x.send(file);
    });
  }

@@ -359,8 +815,8 @@
    // A new batch starts a fresh list once the last one is over.
    if (!upActive) uploads.length = 0;
    const dir = cwd;
-    const batch = [...files].map(f => f.size > 32*1024*1024
-      ? {file: f, name: f.name, size: f.size, dir, state: 'fail', frac: 0, error: 'больше 32 МБ', skip: true}
+    const batch = [...files].map(f => f.size > UP_CAP
+      ? {file: f, name: f.name, size: f.size, dir, state: 'fail', frac: 0, error: 'больше 512 МБ', skip: true}
      : {file: f, name: f.name, size: f.size, dir, state: 'wait', frac: 0, error: ''});
    uploads.push(...batch);
    renderUploads();
@@ -372,8 +828,7 @@
    const refused = () => uploads.filter(u => u.skip).length;
    for (let u; (u = uploads.find(x => x.state === 'wait')); ) {
      u.state = 'send'; renderUploads();
-      const buf = new Uint8Array(await u.file.arrayBuffer());
-      const r = await writeWithProgress(join(u.dir, u.name), buf, frac => {
+      const r = await writeWithProgress(join(u.dir, u.name), u.file, frac => {
        u.frac = frac;
        if (frac >= 1 && u.state === 'send') u.state = 'write';
        renderUploads();
@@ -27,6 +27,12 @@
  .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:4px; padding:4px;
+             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 { height:36px; padding:0 12px; font-size:14px; touch-action:manipulation; -webkit-tap-highlight-color:transparent; }
+  body.touch #terminal { -webkit-user-select:none; user-select:none; -webkit-touch-callout:none; }
 </style>
 </head>
 <body>
@@ -44,6 +50,12 @@
 <div class="wrap" style="max-width:none">
  <div id="terminal"></div>
 </div>
+<div class="selmenu" id="selmenu" hidden>
+  <button type="button" data-a="copy">Копировать</button>
+  <button type="button" class="btn ghost" data-a="paste">Вставить</button>
+  <button type="button" class="btn ghost" data-a="all">Всё</button>
+  <button type="button" class="btn ghost" data-a="close" aria-label="Закрыть">×</button>
+</div>
 <div class="keys" id="keys">
  <button type="button" data-k="esc">ESC</button>
  <button type="button" data-k="/">/</button>
@@ -272,6 +284,111 @@
  });

  function sendResize() { queueIn({ t: 'r', cols: term.cols, rows: term.rows }); }
+  // --- Selecting and copying on touch screens ---
+  // xterm.js has no touch selection of its own. A long press selects the word
+  // 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.
+  if (touch) {
+    const box = document.getElementById('terminal'), menu = document.getElementById('selmenu');
+    let timer = null, start = null, anchor = null, selecting = false;
+    function cellAt(x, y) {
+      const r = box.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 };
+    }
+    function selectWord(c) {
+      const line = term.buffer.active.getLine(c.row);
+      const text = line ? line.translateToString(false) : '';
+      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++;
+      }
+      term.select(a, c.row, b - a + 1);
+      anchor = { from: c.row * term.cols + a, to: c.row * term.cols + b };
+    }
+    function stretch(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 showMenu() {
+      const keys = document.getElementById('keys').getBoundingClientRect();
+      menu.style.top = '';
+      menu.style.bottom = (window.innerHeight - keys.top + 8) + 'px';
+      menu.querySelector('[data-a="copy"]').disabled = !term.hasSelection();
+      menu.hidden = false;
+    }
+    function hideMenu() { menu.hidden = true; term.clearSelection(); anchor = null; }
+    box.addEventListener('touchstart', function (e) {
+      if (e.touches.length !== 1) { clearTimeout(timer); return; }
+      const t = e.touches[0];
+      start = { x: t.clientX, y: t.clientY };
+      if (!menu.hidden) hideMenu();
+      clearTimeout(timer);
+      timer = setTimeout(function () {
+        selecting = true;
+        selectWord(cellAt(start.x, start.y));
+        if (navigator.vibrate) navigator.vibrate(15);
+      }, 450);
+    }, { passive: true, capture: true });
+    box.addEventListener('touchmove', function (e) {
+      const t = e.touches[0];
+      if (selecting) {
+        e.preventDefault(); // no scrolling while the selection stretches
+        e.stopPropagation();
+        stretch(cellAt(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(); });
+
+    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');
+      if (!b) return;
+      const a = b.dataset.a;
+      if (a === 'copy') {
+        const text = term.getSelection();
+        hideMenu();
+        copyText(text).then(function () { setStatus('скопировано', 'st-ok'); setTimeout(function () { setStatus(connected ? 'подключено' : '', connected ? 'st-ok' : ''); }, 1500); },
+          function (err) { setStatus('не скопировалось: ' + err.message, 'st-err'); });
+      } else if (a === 'paste') {
+        hideMenu();
+        if (!navigator.clipboard || !navigator.clipboard.readText) { setStatus('вставка: браузер не даёт буфер', 'st-err'); return; }
+        navigator.clipboard.readText().then(function (t) { if (t) term.paste(t); }, function () { setStatus('вставка: нет доступа к буферу', 'st-err'); });
+      } else if (a === 'all') {
+        term.selectAll();
+        showMenu();
+      } else {
+        hideMenu();
+      }
+    });
+  }
+
  function refit() {
    if (touch && window.visualViewport) {
      // Follow the visible area, so the extra keys sit right above the
@@ -1 +1 @@
 .0.6
 .0.7
				`@@ -0,0 +1 @@`
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.CodeMirror-line::-moz-selection,.cm-fat-cursor .CodeMirror-line>span::-moz-selection,.cm-fat-cursor .CodeMirror-line>span>span::-moz-selection{background:0 0}.cm-fat-cursor{caret-color:transparent}@-moz-keyframes blink{50%{background-color:transparent}}@-webkit-keyframes blink{50%{background-color:transparent}}@keyframes blink{50%{background-color:transparent}}.cm-tab{display:inline-block;text-decoration:inherit}.CodeMirror-rulers{position:absolute;left:0;right:0;top:-50px;bottom:0;overflow:hidden}.CodeMirror-ruler{border-left:1px solid #ccc;top:0;bottom:0;position:absolute}.cm-s-default .cm-header{color:#00f}.cm-s-default .cm-quote{color:#090}.cm-negative{color:#d44}.cm-positive{color:#292}.cm-header,.cm-strong{font-weight:700}.cm-em{font-style:italic}.cm-link{text-decoration:underline}.cm-strikethrough{text-decoration:line-through}.cm-s-default .cm-keyword{color:#708}.cm-s-default .cm-atom{color:#219}.cm-s-default .cm-number{color:#164}.cm-s-default .cm-def{color:#00f}.cm-s-default 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