feat: close buttons as a red cross in a square; static files revalidated by content, so a release reaches the browser at once

VERSION.txt

@@ -1 +1 @@
-0.0.6
+0.0.7

deploy/nginx.conf.example

@@ -21,7 +21,8 @@ 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 / {
@@ -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_read_timeout  300s;
-        proxy_send_timeout  120s;
+        proxy_send_timeout  300s;
     }
 }

internal/agent/client.go

@@ -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},
 	}
 }
 

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.cfg.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/task.go

@@ -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.TaskFSPut:
+		res = a.doFSPut(ctx, env)
+	case proto.TaskFSSend:
+		res = a.doFSSend(ctx, env)
 	default:
 		res = a.execTask(env)
 	}

internal/agent/terminal.go

@@ -20,8 +20,16 @@ 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)
@@ -37,8 +45,13 @@ 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
@@ -46,6 +59,11 @@ func StartPTY(user string) (*PTY, error) {
 	return &PTY{cmd: cmd, f: f}, nil
 }
 
+func isDir(p string) bool {
+	info, err := os.Stat(p)
+	return err == nil && info.IsDir()
+}
+
 // Read reads terminal output.
 func (p *PTY) Read(b []byte) (int, error) { return p.f.Read(b) }
 

internal/proto/proto.go

@@ -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
+	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
@@ -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 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"`

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_panel_fs.go

@@ -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)
-	}
-}

internal/server/handlers_panel_term.go

@@ -49,6 +49,9 @@ 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.
@@ -63,6 +66,10 @@ func (s *Server) handlePanelIn(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "bad request", http.StatusBadRequest)
 		return
 	}
+	if m.Seq > 0 && !sess.TakeSeq(m.Seq) {
+		w.WriteHeader(http.StatusNoContent) // a repeat of one already taken
+		return
+	}
 	switch m.T {
 	case "i":
 		sess.PushIn(proto.InFrame{Type: proto.FrameStdin, Data: m.D})

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
 
@@ -250,6 +251,19 @@ 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()

internal/server/server.go

@@ -1,7 +1,9 @@
 package server
 
 import (
+	"crypto/sha256"
 	"embed"
+	"encoding/hex"
 	"html/template"
 	"io/fs"
 	"log"
@@ -56,6 +58,7 @@ 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
+	xfers  xfers       // files on their way between a browser and an agent
 }
 
 // New builds the server, parsing embedded templates.
@@ -183,7 +186,7 @@ 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)))
 
 	// Public: install script + agent binary downloads.
 	mux.HandleFunc("GET /install.sh", s.handleInstallScript)
@@ -229,6 +232,10 @@ 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.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/{op}", s.requireAdmin(s.handleFSOp))
 
 	// Machine status (admin).
@@ -257,6 +264,8 @@ 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/xfer/{xid}/{i}", s.handleAgentXferGet)
+	mux.HandleFunc("POST /api/agent/fs/xfer/{xid}/{i}", s.handleAgentXferPost)
 
 	return s.logRequests(mux)
 }
@@ -326,3 +335,33 @@ func clientIP(r *http.Request) string {
 	}
 	return host
 }
+
+// staticHandler serves the embedded assets with a content hash as ETag. The
+// browser asks each time whether a file changed (no-cache) and gets a 304
+// when it did not, so a new release reaches it at once without reloading
+// what stayed the same.
+func staticHandler(fsys fs.FS) http.Handler {
+	files := http.FileServer(http.FS(fsys))
+	var mu sync.Mutex
+	etags := map[string]string{}
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		name := strings.TrimPrefix(r.URL.Path, "/")
+		mu.Lock()
+		tag, ok := etags[name]
+		mu.Unlock()
+		if !ok {
+			if data, err := fs.ReadFile(fsys, name); err == nil {
+				sum := sha256.Sum256(data)
+				tag = `"` + hex.EncodeToString(sum[:8]) + `"`
+			}
+			mu.Lock()
+			etags[name] = tag
+			mu.Unlock()
+		}
+		if tag != "" {
+			w.Header().Set("ETag", tag)
+		}
+		w.Header().Set("Cache-Control", "no-cache")
+		files.ServeHTTP(w, r)
+	})
+}

internal/server/web/static/app.css

@@ -62,6 +62,12 @@ 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; }

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 @@
+.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

internal/server/web/static/codemirror/codemirror.js

@@ -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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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/templates/files.html

@@ -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. */
@@ -19,6 +20,23 @@
   .spinner { width:16px; height:16px; border:2px solid var(--border); border-top-color:var(--accent);
              border-radius:50%; animation:spin .7s linear infinite; display:none; }
   @keyframes spin { to { transform:rotate(360deg); } }
+  /* Busy indicator; while files upload it also shows how far they got, and a
+     click on it lists them. */
+  .busy { display:inline-flex; align-items:center; gap:6px; background:none; border:0; padding:0 4px;
+          height:34px; color:var(--muted); font-size:13px; font-variant-numeric:tabular-nums; cursor:default; }
+  .busy:hover { background:none; }
+  .busy.up { cursor:pointer; color:var(--text); }
+  .busy.up:hover { color:var(--accent); }
+  #updlg { max-width:480px; }
+  .upl-item { padding:8px 0; border-bottom:1px solid var(--border); }
+  .upl-item:last-child { border-bottom:0; }
+  .upl-row { display:flex; gap:12px; justify-content:space-between; font-size:14px; }
+  .upl-row .n { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
+  .upl-row .st { flex:none; color:var(--muted); font-size:13px; font-variant-numeric:tabular-nums; }
+  .upl-row .st.ok { color:var(--ok); }
+  .upl-row .st.bad { color:var(--danger); }
+  .upl-bar { height:4px; margin-top:6px; border-radius:2px; background:#0c0f13; overflow:hidden; }
+  .upl-bar i { display:block; height:100%; background:var(--accent); transform-origin:left; transition:transform .2s; }
   #drop { border:1px dashed var(--border); border-radius:10px; }
   #drop.drag { border-color:var(--accent); background:#12202f; }
   table.fm td, table.fm th { padding:7px 8px; }
@@ -27,6 +45,9 @@
   .ic { display:inline-block; width:18px; text-align:center; margin-right:6px; }
   .sz { color:var(--muted); font-variant-numeric:tabular-nums; }
   .act { display:flex; gap:6px; justify-content:flex-end; }
+  /* Sortable headers: a click sorts by the column, a second one turns it round. */
+  table.fm th.srt { cursor:pointer; user-select:none; white-space:nowrap; }
+  table.fm th.srt:hover { color:var(--text); }
   table.fm .c-sz { width:120px; }
   table.fm .c-mt { width:160px; }
   table.fm .c-act { width:160px; }
@@ -39,17 +60,119 @@
     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);
+  #save { display:inline-flex; align-items:center; gap:8px; }
-                  border:1px solid var(--border); border-radius:8px; padding:12px;
+  #save.saving { opacity:.85; cursor:progress; }
-                  font-family:ui-monospace,Menlo,monospace; font-size:13px; }
+  #save.saving::before { content:''; width:12px; height:12px; border:2px solid rgba(255,255,255,.35); border-top-color:#fff;
-  .toast { position:fixed; bottom:18px; left:50%; transform:translateX(-50%);
+                         border-radius:50%; animation:spin .7s linear infinite; }
+  #save[hidden] { display:none; }
+  /* 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: both fields the same width, the
+     buttons of each row after its field. */
+  .find { display:grid; grid-template-columns:minmax(0, 1fr) auto; gap:6px 8px; align-items:center;
+          padding:8px 12px; border-bottom:1px solid var(--border); background:var(--panel); }
+  .find .fin { position:relative; grid-column:1; }
+  .find input { width:100%; height:32px; padding:4px 76px 4px 10px; font-size:13px; font-family:ui-monospace,Menlo,monospace; }
+  .find #frep { padding-right:10px; }
+  .find input.bad { border-color:var(--danger); }
+  .find .cnt { position:absolute; right:10px; top:0; bottom:0; display:flex; align-items:center; pointer-events:none;
+               color:var(--muted); font-size:12px; font-variant-numeric:tabular-nums; }
+  .find .fbtns { grid-column:2; justify-self:end; display:flex; gap:6px; }
+  .find button { height:32px; min-width:32px; padding:0 10px; font-size:13px;
+                 display:inline-flex; align-items:center; justify-content:center; }
+  .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 #frow2, .find #frow2b { grid-row:2; }
+  /* Documents and tables, drawn in the panel's colours. */
+  .vdoc { height:75vh; overflow:auto; background:#0c0f13; border-radius:0 0 12px 12px; }
+  .vdoc .dv-pdf { display:block; width:100%; height:100%; border:0; background:#525659; }
+  .vdoc .dv-html { display:block; width:100%; height:100%; border:0; background:#fff; }
+  .dv-doc { max-width:820px; margin:0 auto; padding:28px 32px 40px; font-size:15px; line-height:1.65; color:var(--text); overflow-wrap:anywhere; }
+  .dv-doc p { margin:0 0 .7em; }
+  .dv-doc h1, .dv-doc h2, .dv-doc h3, .dv-doc h4, .dv-doc h5, .dv-doc h6 { margin:1.2em 0 .5em; line-height:1.3; }
+  .dv-doc h1 { font-size:26px; } .dv-doc h2 { font-size:21px; } .dv-doc h3 { font-size:18px; } .dv-doc h4, .dv-doc h5, .dv-doc h6 { font-size:16px; }
+  .dv-doc ul { margin:0 0 .7em; padding-left:1.4em; }
+  .dv-doc li p { margin:0; }
+  .dv-doc .dv-link { color:var(--accent); }
+  .dv-table { border-collapse:collapse; margin:.4em 0 1em; width:auto; }
+  .dv-table td { border:1px solid var(--border); padding:6px 10px; vertical-align:top; font-size:14px; }
+  .dv-table td p { margin:0; }
+  .dv-scroll { overflow:auto; }
+  .dv-grid { max-height:100%; }
+  .dv-sheet { width:auto; border-collapse:separate; border-spacing:0; font-size:13px; font-variant-numeric:tabular-nums; }
+  .dv-sheet th, .dv-sheet td { border-right:1px solid var(--border); border-bottom:1px solid var(--border); padding:4px 10px;
+                               white-space:nowrap; max-width:360px; overflow:hidden; text-overflow:ellipsis; text-align:left; }
+  .dv-sheet thead th { position:sticky; top:0; z-index:1; background:var(--panel); color:var(--muted); font-weight:500; text-align:center; }
+  .dv-sheet tbody th { position:sticky; left:0; background:var(--panel); color:var(--muted); font-weight:500; text-align:right; }
+  .dv-sheet thead th:first-child { left:0; z-index:2; }
+  .dv-sheet td.n { text-align:right; }
+  .dv-tabs { position:sticky; top:0; z-index:3; display:flex; gap:6px; flex-wrap:wrap; padding:8px 12px; background:var(--panel); border-bottom:1px solid var(--border); }
+  .dv-tabs button { height:28px; padding:0 12px; font-size:13px; background:transparent; border:1px solid var(--border); color:var(--muted); }
+  .dv-tabs button.on { border-color:var(--accent); color:var(--text); background:#12202f; }
+  .dv-note { color:var(--muted); font-size:13px; padding:12px 16px; margin:0; }
+  /* 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 { z-index:50; 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; }
   .toast.show { opacity:1; }
@@ -71,7 +194,7 @@
   <div class="fm-bar">
     <button class="btn ghost small" id="up">↑ Вверх</button>
     <input class="fm-path" id="path" value="/" spellcheck="false" autocapitalize="off" autocomplete="off">
-    <span class="spinner" id="spin"></span>
+    <button type="button" class="busy" id="busy" title=""><span class="spinner" id="spin"></span><span id="uppct"></span></button>
     <button class="btn ghost small" id="refresh">Обновить</button>
   </div>
   <div class="fm-bar">
@@ -88,8 +211,8 @@
     <table class="fm">
       <thead><tr>
         <th style="width:28px"><input type="checkbox" id="all"></th>
-        <th>Имя</th><th class="sz c-sz">Размер</th>
+        <th class="srt" data-sort="name">Имя</th><th class="sz c-sz srt" data-sort="size">Размер</th>
-        <th class="sz c-mt">Изменён</th><th class="c-act"></th>
+        <th class="sz c-mt srt" data-sort="mtime">Изменён</th><th class="c-act"></th>
       </tr></thead>
       <tbody id="list"></tbody>
     </table>
@@ -99,18 +222,54 @@
 
 <dialog id="viewer">
   <div class="dlg-h">
-    <strong id="vname" style="flex:1; overflow:hidden; text-overflow:ellipsis"></strong>
+    <strong class="vpath" dir="rtl"><bdi id="vname"></bdi></strong>
-    <button class="btn small" id="save" style="display:none">Сохранить</button>
+    <button class="btn ghost small" id="vtext" hidden>Редактировать</button>
-    <button class="btn ghost small" id="closev">Закрыть</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 icon close x" id="closev" 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 class="vmsg muted" id="vmsg"></div>
   </div>
-  <div class="dlg-b">
+  <div class="vbody">
-    <div id="vmsg" class="muted" style="margin-bottom:8px; font-size:13px"></div>
+    <div class="find" id="find" hidden>
-    <textarea id="edit" spellcheck="false"></textarea>
+      <div class="fin"><input type="text" id="fq" placeholder="Найти" spellcheck="false" autocomplete="off"><span class="cnt" id="fcnt"></span></div>
+      <div class="fbtns">
+        <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)" aria-label="Предыдущее">
+          <svg width="12" height="12" viewBox="0 0 12 12"><path d="M6 2.5 11 9.5H1z" fill="currentColor"/></svg>
+        </button>
+        <button type="button" class="btn ghost" id="fnext" title="Следующее (Enter)" aria-label="Следующее">
+          <svg width="12" height="12" viewBox="0 0 12 12"><path d="M6 9.5 1 2.5h10z" fill="currentColor"/></svg>
+        </button>
+        <button type="button" class="btn ghost close" id="fclose" title="Закрыть поиск (Esc)" aria-label="Закрыть поиск">
+          <svg width="13" height="13" 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="fin" id="frow2"><input type="text" id="frep" placeholder="Заменить на" spellcheck="false" autocomplete="off"></div>
+      <div class="fbtns" id="frow2b">
+        <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="vdoc" id="vdoc" hidden></div>
+    <div class="hexed" id="vhexed" tabindex="0" hidden><div id="hxsp"></div><div class="hx-rows" id="hxrows"></div></div>
+  </div>
+</dialog>
+
+<dialog id="updlg">
+  <div class="dlg-h">
+    <strong style="flex:1">Загрузка файлов</strong>
+    <button class="btn ghost small icon close x" id="updlg-close" 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" id="updlg-list"></div>
 </dialog>
 
 <div class="toast" id="toast"></div>
 
+<script src="/static/codemirror/codemirror.js"></script>
+<script src="/static/docview.js"></script>
 <script>
 (function () {
   const agentID = {{.Agent.ID}};
@@ -129,15 +288,25 @@
   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 = [];
   const selected = new Set();
 
   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); };
+  // An open dialog sits in the page's top layer, above any z-index: the toast
+  // goes inside it then, so "сохранено" or an error shows over the editor.
+  let toastTimer = null;
+  const toast = (msg, err) => {
+    const t = $('toast'), host = document.querySelector('dialog[open]') || document.body;
+    if (t.parentNode !== host) host.appendChild(t);
+    t.textContent = msg;
+    t.className = 'toast show' + (err ? ' err' : '');
+    clearTimeout(toastTimer);
+    toastTimer = setTimeout(() => t.className = 'toast', err ? 3500 : 2200);
+  };
   const b64ToBytes = b64 => { const bin=atob(b64); const u=new Uint8Array(bin.length); for(let i=0;i<bin.length;i++)u[i]=bin.charCodeAt(i); return u; };
-  const bytesToB64 = bytes => { let s=''; const CH=0x8000; for(let i=0;i<bytes.length;i+=CH) s+=String.fromCharCode.apply(null, bytes.subarray(i,i+CH)); return btoa(s); };
   const join = (dir, name) => (dir.endsWith('/') ? dir : dir+'/') + name;
   const parent = p => { if(p==='/'||p==='') return '/'; const i=p.replace(/\/+$/,'').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'; };
@@ -160,10 +329,42 @@
     $('path').value = cwd; render();
   }
 
+  // Sorting: by name, size or time, folders always ahead of files. Kept in
+  // this browser for each folder of each machine.
+  const SORT_DEF = {by: 'name', dir: 1};
+  const sortKey = () => 'lpra.sort:' + agentID + ':' + cwd;
+  function getSort() {
+    try { const v = JSON.parse(localStorage.getItem(sortKey())); if (v && ['name', 'size', 'mtime'].includes(v.by)) return v; } catch (e) {}
+    return SORT_DEF;
+  }
+  function setSort(v) {
+    try {
+      if (v.by === SORT_DEF.by && v.dir === SORT_DEF.dir) localStorage.removeItem(sortKey());
+      else localStorage.setItem(sortKey(), JSON.stringify(v));
+    } catch (e) {}
+  }
+  const byName = (a, b) => a.name.localeCompare(b.name, undefined, {numeric: true, sensitivity: 'base'}) || (a.name < b.name ? -1 : a.name > b.name ? 1 : 0);
+  function sorted() {
+    const s = getSort();
+    const key = s.by === 'size' ? e => e.size || 0 : s.by === 'mtime' ? e => e.mtime || 0 : null;
+    return entries.slice().sort((a, b) => {
+      if (a.is_dir !== b.is_dir) return a.is_dir ? -1 : 1;
+      const d = key ? key(a) - key(b) : 0;
+      return (d || byName(a, b)) * s.dir;
+    });
+  }
+  document.querySelectorAll('table.fm th.srt').forEach(th => th.onclick = () => {
+    const s = getSort(), by = th.dataset.sort;
+    // A new column starts the way it is most often wanted: names A to Z,
+    // sizes and times biggest and newest first.
+    setSort(s.by === by ? {by, dir: -s.dir} : {by, dir: by === 'name' ? 1 : -1});
+    render();
+  });
+
   function render() {
     const tb = $('list'); tb.innerHTML = '';
     updateSel();
-    for (const e of entries) {
+    for (const e of sorted()) {
       const tr = document.createElement('tr');
       const isZip = !e.is_dir && /\.zip$/i.test(e.name);
       const dlHref = '/api/panel/agents/' + encodeURIComponent(agentID) + '/fs/download?path=' + encodeURIComponent(join(cwd, e.name));
@@ -173,7 +374,7 @@
         '<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>' +
@@ -195,30 +396,530 @@
     $('zipsel').disabled = !n; $('delsel').disabled = !n;
   }
 
+  // ---------- File viewer ----------
+  const fsURL = (what, path) => '/api/panel/agents/' + encodeURIComponent(agentID) + '/fs/' + what + '?path=' + encodeURIComponent(path);
+
+  // Sends a file to the client in pieces: each a request of its own (a proxy
+  // in front takes only so much at once), a few in flight together so a good
+  // link stays busy, and one the link drops is sent again alone. onFrac gets
+  // how much has gone; the answer is the client's, once it has written it.
+  const SEND_WORKERS = 4;
+  async function sendFile(path, blob, onFrac) {
+    let st;
+    try {
+      st = await fetch(fsURL('upload', path) + '&size=' + blob.size, {method: 'POST'}).then(r => r.json());
+    } catch (e) { return {ok: false, error: 'ошибка сети'}; }
+    if (!st.ok) return st;
+    const {id, chunk} = st.data;
+    const xurl = '/api/panel/fs/xfer/' + encodeURIComponent(id);
+    const n = Math.max(1, Math.ceil(blob.size / chunk));
+    const sent = new Array(n).fill(0);
+    const report = () => onFrac && onFrac(blob.size ? Math.min(1, sent.reduce((a, b) => a + b, 0) / blob.size) : 1);
+    let next = 0, failed = null;
+    const putPiece = (i, part) => new Promise(resolve => {
+      const x = new XMLHttpRequest();
+      x.open('PUT', xurl + '/' + i);
+      x.setRequestHeader('Content-Type', 'application/octet-stream');
+      x.upload.onprogress = ev => { sent[i] = ev.loaded; report(); };
+      x.onload = () => resolve({status: x.status, text: x.responseText});
+      x.onerror = x.ontimeout = () => resolve({status: 0});
+      x.timeout = 5 * 60 * 1000;
+      x.send(part);
+    });
+    async function worker() {
+      while (!failed && next < n) {
+        const i = next++, part = blob.slice(i * chunk, (i + 1) * chunk);
+        for (let tries = 0; !failed; ) {
+          const r = await putPiece(i, part);
+          if (r.status === 204) { sent[i] = part.size; report(); break; }
+          if (r.status === 410 || r.status === 400) { failed = (r.text || '').trim() || 'передача прервана'; break; }
+          sent[i] = 0; report();
+          if (r.status === 503) continue; // the client is busy: just again
+          if (++tries >= 30) { failed = 'сеть не держит передачу'; break; }
+          await new Promise(res => setTimeout(res, Math.min(tries, 10) * 1000));
+        }
+      }
+    }
+    await Promise.all(Array.from({length: Math.min(SEND_WORKERS, n)}, worker));
+    if (failed) {
+      fetch(xurl + '/cancel', {method: 'POST'}).catch(() => {});
+      return {ok: false, error: failed};
+    }
+    for (let tries = 0; ; ) {
+      try {
+        const r = await fetch(xurl + '/result', {cache: 'no-store'}).then(r => r.json());
+        if (r.done) return r.result;
+        tries = 0;
+      } catch (e) {
+        if (++tries >= 30) return {ok: false, error: 'нет ответа о записи файла'};
+        await new Promise(res => setTimeout(res, 2000));
+      }
+    }
+  }
+  // Writes a file as it is, with no base64: the request body is the file.
+  async function putFile(path, body) {
+    // The save button turns into a small spinner meanwhile, and takes no
+    // second click.
+    const btn = $('save');
+    if (btn.classList.contains('saving')) return {ok: false, error: 'сохранение уже идёт'};
+    btn.classList.add('saving');
+    btn.disabled = true;
+    setBusy(true);
+    try {
+      return await sendFile(path, new Blob([body]));
+    } finally { setBusy(false); btn.classList.remove('saving'); btn.disabled = false; }
+  }
+
+  const IMG = /\.(png|jpe?g|gif|webp|bmp|ico|avif|svg)$/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
+  const DOC = /\.(pdf|docx?|odt|xlsx|ods|csv|tsv|html?|db|sqlite3?|db3)$/i;
+  const DOC_CAP = 32 * 1024 * 1024; // the biggest document drawn here
+
+  // Highlighting by the file's name, then its extension, then its #! line.
+  const BY_EXT = {
+    py:'python', pyw:'python', go:'go', c:'text/x-csrc', h:'text/x-csrc', cc:'text/x-c++src', cpp:'text/x-c++src', cxx:'text/x-c++src',
+    hpp:'text/x-c++src', hh:'text/x-c++src', java:'text/x-java', kt:'text/x-kotlin', kts:'text/x-kotlin', cs:'text/x-csharp', scala:'text/x-scala',
+    js:'javascript', mjs:'javascript', cjs:'javascript', jsx:'javascript', ts:'text/typescript', tsx:'text/typescript', json:'application/json',
+    css:'css', scss:'text/x-scss', less:'text/x-less', html:'htmlmixed', htm:'htmlmixed', vue:'htmlmixed', xml:'xml', svg:'xml', plist:'xml', xsd:'xml',
+    php:'php', sh:'shell', bash:'shell', zsh:'shell', ksh:'shell', yaml:'yaml', yml:'yaml', md:'markdown', markdown:'markdown', sql:'sql',
+    toml:'toml', ini:'properties', cfg:'properties', conf:'properties', cnf:'properties', env:'properties', properties:'properties',
+    service:'properties', timer:'properties', socket:'properties', mount:'properties', lua:'lua', rs:'rust', diff:'diff', patch:'diff',
+    rb:'ruby', pl:'perl', pm:'perl', cmake:'cmake'
+  };
+  const BY_NAME = {
+    'dockerfile':'dockerfile', 'containerfile':'dockerfile', 'makefile':'shell', '.bashrc':'shell', '.bash_profile':'shell', '.profile':'shell',
+    '.zshrc':'shell', '.zprofile':'shell', '.env':'properties', 'cmakelists.txt':'cmake', 'gemfile':'ruby', 'rakefile':'ruby',
+    'nginx.conf':'nginx', 'go.mod':'go', 'requirements.txt':'properties'
+  };
+  function modeFor(path, text) {
+    const name = path.slice(path.lastIndexOf('/') + 1).toLowerCase();
+    if (BY_NAME[name]) return BY_NAME[name];
+    if (/^dockerfile\./.test(name)) return 'dockerfile';
+    if (/\/nginx\//.test(path) && /\.conf$/.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'], ['vdoc', 'doc']]) $(id).hidden = which !== k;
+    if (which !== 'doc') $('vdoc').innerHTML = '';
+    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);
+    if (DOC.test(e.name)) return viewDoc(path, e.size);
+    const r = await api('read', {path});
     if (!r.ok) { toast(r.error || 'ошибка', true); return; }
-    const d = r.data;
+    if (r.data.binary) return viewHex(path, r.data.size);
-    $('vname').textContent = e.name;
+    viewText(path, r.data);
-    const ta = $('edit'); const save = $('save'); const msg = $('vmsg');
+  }
-    if (d.binary) {
+
-      ta.value = '(бинарный файл, просмотр недоступен)'; ta.readOnly = true; save.style.display='none';
+  function viewText(path, d) {
-      msg.textContent = 'Размер: '+fmtSize(d.size);
+    openViewer(path);
-    } else {
+    V.kind = 'code';
-      ta.value = new TextDecoder().decode(b64ToBytes(d.content));
+    const text = new TextDecoder().decode(b64ToBytes(d.content));
     const editable = d.size <= EDIT_LIMIT && !d.truncated;
-      ta.readOnly = !editable;
+    const c = editor();
-      save.style.display = editable ? '' : 'none';
+    showPane('code');
-      msg.textContent = 'Размер: '+fmtSize(d.size) + (d.truncated?' · показано первые '+fmtSize(EDIT_LIMIT):'') + (editable?' · редактируемо':' · только чтение (больше '+fmtSize(EDIT_LIMIT)+')');
+    const mode = modeFor(path, text);
-      save.onclick = async () => {
+    c.setOption('mode', mode);
-        const bytes = new TextEncoder().encode(ta.value);
+    c.setOption('indentWithTabs', mode === 'go' || /(^|\/)makefile$/i.test(path));
-        const w = await api('write', {path: join(cwd, e.name), data: bytesToB64(bytes)});
+    c.setOption('readOnly', !editable);
-        if (w.ok) { toast('сохранено'); $('viewer').close(); load(cwd); } else toast(w.error||'ошибка', true);
+    c.setValue(text);
+    c.clearHistory();
+    V.clean = c.changeGeneration();
+    V.dirty = false;
+    setButtons({save: editable});
+    $('frow2').hidden = $('frow2b').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);
+    };
+    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 = () => { $('vmsg').textContent = fmtSize(size) + ' · браузер не смог это показать'; };
+    el.src = fsURL('download', path) + '&inline=1';
+    box.appendChild(el);
+    // SVG is text: edited as such, not byte by byte.
+    const svg = /\.svg$/i.test(path);
+    setButtons({text: svg, hex: !svg});
+    $('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); };
+  }
+  // PDF goes to the browser's own viewer; the rest is drawn by docview.js.
+  async function viewDoc(path, size) {
+    openViewer(path);
+    V.kind = 'doc';
+    showPane('doc');
+    const ext = path.slice(path.lastIndexOf('.') + 1).toLowerCase();
+    // Text with a preview gets the text editor; the rest, the hex one.
+    const isText = ext === 'csv' || ext === 'tsv' || ext === 'html' || ext === 'htm';
+    setButtons({text: isText, hex: !isText});
+    $('vtext').onclick = async () => {
+      const r = await api('read', {path});
+      if (!r.ok) { toast(r.error || 'ошибка', true); return; }
+      viewText(path, r.data);
+    };
+    $('vhex').onclick = () => viewHex(path, size);
+    const box = $('vdoc');
+    $('vmsg').textContent = fmtSize(size);
+    if (ext === 'pdf') {
+      const src = fsURL('download', path) + '&inline=1';
+      box.innerHTML = '<iframe class="dv-pdf" title="PDF"></iframe>';
+      box.firstChild.src = src;
+      const a = document.createElement('a');
+      a.href = src; a.target = '_blank'; a.rel = 'noopener'; a.textContent = 'открыть в новой вкладке';
+      $('vmsg').append(' · ', a);
+      return;
+    }
+    if (ext === 'html' || ext === 'htm') {
+      // The page as it looks, in a frame that runs none of its scripts.
+      const r = await api('read', {path});
+      if (V.path !== path || V.kind !== 'doc') return;
+      if (!r.ok) { box.innerHTML = '<p class="dv-note">не удалось показать: ' + esc(r.error || 'ошибка') + '</p>'; return; }
+      const f = document.createElement('iframe');
+      f.className = 'dv-html';
+      f.setAttribute('sandbox', '');
+      f.title = 'HTML';
+      f.srcdoc = new TextDecoder().decode(b64ToBytes(r.data.content));
+      box.innerHTML = '';
+      box.appendChild(f);
+      if (r.data.truncated) $('vmsg').textContent += ' · показаны первые ' + fmtSize(EDIT_LIMIT);
+      return;
+    }
+    if (size > DOC_CAP) { box.innerHTML = '<p class="dv-note">файл больше ' + fmtSize(DOC_CAP) + ' - для просмотра скачайте его</p>'; return; }
+    box.innerHTML = '<p class="dv-note">загрузка…</p>';
+    let html;
+    try {
+      setBusy(true);
+      const r = await fetch(fsURL('download', path));
+      if (!r.ok) throw new Error((await r.text()).trim() || ('HTTP ' + r.status));
+      const buf = await r.arrayBuffer();
+      if (V.path !== path || V.kind !== 'doc') return;
+      html = ext === 'docx' ? await DocView.docx(buf)
+        : ext === 'odt' ? await DocView.odt(buf)
+        : ext === 'xlsx' ? await DocView.xlsx(buf)
+        : ext === 'ods' ? await DocView.ods(buf)
+        : ext === 'doc' ? DocView.doc(buf)
+        : /^(db|sqlite3?|db3)$/.test(ext) ? DocView.sqlite(buf)
+        : DocView.csv(new TextDecoder().decode(buf), ext === 'tsv');
+    } catch (err) {
+      html = '<p class="dv-note">не удалось показать: ' + esc(err.message) + '</p>';
+    } finally { setBusy(false); }
+    if (V.path !== path || V.kind !== 'doc') return;
+    box.innerHTML = html;
+    DocView.bindTabs(box);
+  }
+
+  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) {
@@ -280,17 +981,83 @@
     if (e.key === 'Enter') { e.preventDefault(); navTo($('path').value); }
   });
 
-  // uploads
+  // uploads: one file at a time, each with its progress. What has gone up
+  // shows as a percentage by the spinner; a click on it lists the files.
+  const uploads = [];
+  let upActive = false, upDoneTimer = null;
+  const UP_ST = { wait: 'в очереди', send: '', write: 'запись на клиенте…', done: 'готово', fail: 'ошибка' };
+  function renderUploads() {
+    const pend = uploads.filter(u => u.state === 'wait' || u.state === 'send' || u.state === 'write');
+    const counted = uploads.filter(u => !u.skip);
+    const total = counted.reduce((n, u) => n + u.size, 0) || 1;
+    const sent = counted.reduce((n, u) => n + (u.state === 'wait' ? 0 : u.state === 'send' ? u.size * u.frac : u.size), 0);
+    const busy = $('busy');
+    busy.classList.toggle('up', uploads.length > 0);
+    busy.title = uploads.length ? 'Показать загружаемые файлы' : '';
+    $('uppct').textContent = pend.length ? Math.floor(100 * sent / total) + '%' + (counted.length > 1 ? ' · ' + (counted.length - pend.length) + '/' + counted.length : '') : '';
+    const list = $('updlg-list');
+    if (!$('updlg').open) return;
+    list.innerHTML = uploads.length ? '' : '<p class="muted">Сейчас ничего не загружается.</p>';
+    for (const u of uploads) {
+      const pct = u.state === 'send' ? Math.floor(100 * u.frac) : u.state === 'wait' ? 0 : 100;
+      const st = u.state === 'send' ? pct + '%' : u.state === 'fail' ? (u.error || UP_ST.fail) : UP_ST[u.state];
+      const el = document.createElement('div');
+      el.className = 'upl-item';
+      el.innerHTML = '<div class="upl-row"><span class="n"></span><span class="st"></span></div><div class="upl-bar"><i></i></div>';
+      el.querySelector('.n').textContent = u.name + ' · ' + fmtSize(u.size);
+      const stEl = el.querySelector('.st');
+      stEl.textContent = st;
+      stEl.className = 'st' + (u.state === 'done' ? ' ok' : u.state === 'fail' ? ' bad' : '');
+      el.querySelector('.upl-bar i').style.transform = 'scaleX(' + pct / 100 + ')';
+      if (u.state === 'fail') el.querySelector('.upl-bar i').style.background = 'var(--danger)';
+      list.appendChild(el);
+    }
+  }
+  $('busy').onclick = () => { if (!uploads.length) return; $('updlg').showModal(); renderUploads(); };
+  $('updlg-close').onclick = () => $('updlg').close();
+
+  // The pieces go on to the client as they come, so the bar follows the
+  // whole way.
+  const UP_CAP = 512 * 1024 * 1024;
+  const writeWithProgress = (path, file, onFrac) => sendFile(path, file, onFrac);
+
   async function uploadFiles(files) {
-    for (const f of files) {
+    clearTimeout(upDoneTimer);
-      if (f.size > 32*1024*1024) { toast('файл '+f.name+' больше 32 МБ', true); continue; }
+    // A new batch starts a fresh list once the last one is over.
-      const buf = new Uint8Array(await f.arrayBuffer());
+    if (!upActive) uploads.length = 0;
-      const r = await api('write', {path: join(cwd, f.name), data: bytesToB64(buf)});
+    const dir = cwd;
-      if (!r.ok) { toast(r.error||('ошибка '+f.name), true); return; }
+    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();
+    if (upActive) return;
+    upActive = true;
+    setBusy(true);
+    let failed = 0;
+    // Files refused up front count as failed too.
+    const refused = () => uploads.filter(u => u.skip).length;
+    for (let u; (u = uploads.find(x => x.state === 'wait')); ) {
+      u.state = 'send'; renderUploads();
+      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();
+      });
+      if (r.ok) u.state = 'done';
+      else { u.state = 'fail'; u.error = r.error || 'ошибка'; failed++; }
+      renderUploads();
+      if (u.dir === cwd) load(cwd);
     }
-    toast('загружено'); load(cwd);
+    setBusy(false);
+    upActive = false;
+    failed += refused();
+    toast(failed ? 'не загружено: ' + failed : 'загружено', !!failed);
+    renderUploads();
+    // The list stays a while for a look, then the indicator goes quiet.
+    upDoneTimer = setTimeout(() => { if (!upActive) { uploads.length = 0; renderUploads(); } }, failed ? 30000 : 8000);
   }
-  $('upl').onchange = ev => uploadFiles(ev.target.files);
+  $('upl').onchange = ev => { uploadFiles(ev.target.files); ev.target.value = ''; };
   const drop = $('drop');
   ['dragenter','dragover'].forEach(x => drop.addEventListener(x, e => { e.preventDefault(); drop.classList.add('drag'); }));
   ['dragleave','drop'].forEach(x => drop.addEventListener(x, e => { e.preventDefault(); if(x!=='drop')drop.classList.remove('drag'); }));

internal/server/web/templates/terminal.html

@@ -27,6 +27,13 @@
   .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 #terminal { -webkit-user-select:none; user-select:none; -webkit-touch-callout:none; }
 </style>
 </head>
 <body>
@@ -44,6 +51,20 @@
 <div class="wrap" style="max-width:none">
   <div id="terminal"></div>
 </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>
   <button type="button" data-k="/">/</button>
@@ -162,11 +183,42 @@
     term.write('\r\n\x1b[33m' + msg + '\x1b[0m\r\n');
   }
 
-  function send(data) {
+  // Input goes out one request at a time, so on a slow link a keystroke can
+  // never overtake the one before it; what is typed meanwhile is sent together
+  // next. A request that fails goes again under the same number, and the
+  // server drops one it already has.
+  let inSeq = 0, inBusy = false;
+  const inQueue = [];
+  function queueIn(m) {
     if (closed || !sid) return;
-    const bytes = new TextEncoder().encode(data);
+    const last = inQueue[inQueue.length - 1];
-    post(base + sid + '/in', { t: 'i', d: bytesToB64(bytes) });
+    if (last && last.t === 'i' && m.t === 'i') last.text += m.text;
+    else if (last && last.t === 'r' && m.t === 'r') inQueue[inQueue.length - 1] = m;
+    else inQueue.push(m);
+    pumpIn();
   }
+  async function pumpIn() {
+    if (inBusy || !inQueue.length) return;
+    inBusy = true;
+    while (inQueue.length && !closed) {
+      const m = inQueue.shift();
+      const body = m.t === 'i'
+        ? { t: 'i', d: bytesToB64(new TextEncoder().encode(m.text)), seq: ++inSeq }
+        : { t: 'r', cols: m.cols, rows: m.rows, seq: ++inSeq };
+      for (let wait = 300; !closed; wait = Math.min(wait * 2, 5000)) {
+        let r = null;
+        try {
+          r = await fetch(base + 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; // taken, or refused for good
+        await new Promise(res => setTimeout(res, wait));
+      }
+    }
+    inBusy = false;
+  }
+  function send(data) { queueIn({ t: 'i', text: data }); }
   // What the keyboard types gets the CTRL / ALT of the extra keys, if armed.
   term.onData(function (data) { send(withMods(data)); });
 
@@ -240,10 +292,112 @@
     b.addEventListener('contextmenu', function (e) { e.preventDefault(); });
   });
 
-  function sendResize() {
+  function sendResize() { queueIn({ t: 'r', cols: term.cols, rows: term.rows }); }
-    if (closed || !sid) return;
+  // --- Selecting and copying on touch screens ---
-    post(base + sid + '/in', { t: 'r', cols: term.cols, rows: term.rows });
+  // 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