| 1 | package client |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "fmt" |
| 7 | "net/http" |
| 8 | "net/url" |
| 9 | "strings" |
| 10 | "sync" |
| 11 | "time" |
| 12 | |
| 13 | "github.com/coder/websocket" |
| 14 | |
| 15 | "lchat/internal/e2ee" |
| 16 | ) |
| 17 | |
| 18 | // Client is one member identity's live connection to an instance: it dials the |
| 19 | // WebSocket, unwraps thread keys, decrypts what arrives, and hands every chat |
| 20 | // message to OnMessage. It is the transport half of internal/bot's Runtime with |
| 21 | // the bot policy left out — a client shows its person everything (including |
| 22 | // other bots' messages, which a bot deliberately never sees), and decides |
| 23 | // nothing on their behalf. |
| 24 | // |
| 25 | // Unlike the bot runtime, methods here may be called from other goroutines |
| 26 | // than the read loop (a CLI sends from stdin while frames arrive), so the |
| 27 | // key/cursor state is mutex-guarded. |
| 28 | type Client struct { |
| 29 | Base string |
| 30 | Session *Session |
| 31 | // OnMessage receives every decrypted chat message, live or via catch-up — |
| 32 | // including this member's own (Mine), which arrive echoed back; the caller |
| 33 | // decides how to render each. |
| 34 | OnMessage func(Message) |
| 35 | // OnReady, if set, is called once each time the client finishes connecting. |
| 36 | OnReady func() |
| 37 | Logf func(format string, args ...any) |
| 38 | |
| 39 | hc *http.Client |
| 40 | uid string // this member's user id (lazily fetched from /api/me) |
| 41 | |
| 42 | mu sync.Mutex // guards keys + cursors |
| 43 | keys map[string]keyEntry |
| 44 | cursors map[string]int64 // threadId -> last message id delivered |
| 45 | |
| 46 | wmu sync.Mutex // coder/websocket allows one concurrent writer |
| 47 | conn *websocket.Conn |
| 48 | |
| 49 | sentMu sync.Mutex // guards sentIDs |
| 50 | sentIDs map[int64]bool |
| 51 | // sendMu is held for a Send's whole store round trip. The server |
| 52 | // broadcasts as soon as it stores, so our own echo can race the POST |
| 53 | // response that carries the stored id — delivery of own-name messages |
| 54 | // takes this lock first, waiting out the in-flight Send so the echo is |
| 55 | // never misread as another device's message. |
| 56 | sendMu sync.Mutex |
| 57 | } |
| 58 | |
| 59 | type keyEntry struct { |
| 60 | key []byte |
| 61 | kind string |
| 62 | } |
| 63 | |
| 64 | // Message is one decrypted chat message. |
| 65 | type Message struct { |
| 66 | ThreadID string |
| 67 | ID int64 |
| 68 | Name string // sender's payload name |
| 69 | Text string |
| 70 | Ts int64 // sender-stamped, ms epoch (0 when the payload carries none) |
| 71 | Mine bool // authored by this member (by payload name — any of their devices) |
| 72 | Echo bool // sent by THIS process, echoed back (already on the caller's screen) |
| 73 | Action bool // a /me-style action line, not a bubble |
| 74 | Actions int // action chips the message carries (tappable only in the app) |
| 75 | } |
| 76 | |
| 77 | // Thread is one chat as a person sees it in the sidebar: display name |
| 78 | // decrypted, latest line previewed. |
| 79 | type Thread struct { |
| 80 | ID string |
| 81 | Kind string // self | dm | group |
| 82 | Name string // decrypted display name ("" when no key or no name yet) |
| 83 | App string // a self app-thread's app id (name_blob.app — e.g. "vault"), "" otherwise |
| 84 | LastName string // sender of the latest message ("" when none/undecryptable) |
| 85 | LastText string |
| 86 | LastAt int64 // unix seconds of the latest message (0 when none) |
| 87 | } |
| 88 | |
| 89 | func (c *Client) init() { |
| 90 | if c.hc == nil { |
| 91 | c.hc = &http.Client{Timeout: 30 * time.Second} |
| 92 | } |
| 93 | c.mu.Lock() |
| 94 | if c.keys == nil { |
| 95 | c.keys = map[string]keyEntry{} |
| 96 | c.cursors = map[string]int64{} |
| 97 | } |
| 98 | c.mu.Unlock() |
| 99 | } |
| 100 | |
| 101 | // Run connects and serves until ctx is cancelled, reconnecting with backoff on |
| 102 | // any drop. |
| 103 | func (c *Client) Run(ctx context.Context) error { |
| 104 | c.init() |
| 105 | backoff := time.Second |
| 106 | for { |
| 107 | start := time.Now() |
| 108 | err := c.connectOnce(ctx) |
| 109 | if ctx.Err() != nil { |
| 110 | return ctx.Err() |
| 111 | } |
| 112 | if time.Since(start) > time.Minute { |
| 113 | backoff = time.Second |
| 114 | } |
| 115 | c.logf("disconnected (%v); reconnecting in %s", err, backoff) |
| 116 | select { |
| 117 | case <-time.After(backoff): |
| 118 | case <-ctx.Done(): |
| 119 | return ctx.Err() |
| 120 | } |
| 121 | backoff = min(backoff*2, 30*time.Second) |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | func (c *Client) connectOnce(ctx context.Context) error { |
| 126 | wsBase := strings.Replace(c.Base, "http", "ws", 1) |
| 127 | conn, _, err := websocket.Dial(ctx, wsBase+"/ws?token="+url.QueryEscape(c.Session.Token), nil) |
| 128 | if err != nil { |
| 129 | return err |
| 130 | } |
| 131 | defer conn.CloseNow() |
| 132 | // The server caps blobs at 64K; the library's 32K default would kill the |
| 133 | // socket on the first big message. |
| 134 | conn.SetReadLimit(256 * 1024) |
| 135 | c.wmu.Lock() |
| 136 | c.conn = conn |
| 137 | c.wmu.Unlock() |
| 138 | defer func() { |
| 139 | c.wmu.Lock() |
| 140 | c.conn = nil |
| 141 | c.wmu.Unlock() |
| 142 | }() |
| 143 | |
| 144 | if err := c.loadThreads(); err != nil { |
| 145 | return err |
| 146 | } |
| 147 | c.catchUp() |
| 148 | |
| 149 | // Keepalive: the server closes idle sockets and ignores "ping" frames. |
| 150 | pingCtx, cancel := context.WithCancel(ctx) |
| 151 | defer cancel() |
| 152 | go func() { |
| 153 | t := time.NewTicker(30 * time.Second) |
| 154 | defer t.Stop() |
| 155 | for { |
| 156 | select { |
| 157 | case <-t.C: |
| 158 | c.send(map[string]any{"type": "ping"}) |
| 159 | case <-pingCtx.Done(): |
| 160 | return |
| 161 | } |
| 162 | } |
| 163 | }() |
| 164 | |
| 165 | if c.OnReady != nil { |
| 166 | c.OnReady() |
| 167 | } |
| 168 | for { |
| 169 | _, data, err := conn.Read(ctx) |
| 170 | if err != nil { |
| 171 | return err |
| 172 | } |
| 173 | c.onFrame(data) |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | type wsFrame struct { |
| 178 | Type string `json:"type"` |
| 179 | ThreadID string `json:"thread_id"` |
| 180 | ID int64 `json:"id"` |
| 181 | Blob string `json:"blob"` |
| 182 | Ephemeral bool `json:"ephemeral"` |
| 183 | } |
| 184 | |
| 185 | func (c *Client) onFrame(data []byte) { |
| 186 | var f wsFrame |
| 187 | if json.Unmarshal(data, &f) != nil { |
| 188 | return |
| 189 | } |
| 190 | // v1 renders new messages only: reactions/edits/deletes and ephemeral |
| 191 | // presence traffic (typing beats ride as id-less type:"msg") are skipped. |
| 192 | if f.Type != "msg" || f.ThreadID == "" || f.Ephemeral { |
| 193 | return |
| 194 | } |
| 195 | c.mu.Lock() |
| 196 | _, known := c.keys[f.ThreadID] |
| 197 | c.mu.Unlock() |
| 198 | if !known { |
| 199 | c.loadThreads() // a thread we were just added to |
| 200 | // loadThreads baselines a new thread's cursor at its latest message — |
| 201 | // which is the very frame that made us load it (the server stores before |
| 202 | // it broadcasts), so the gate below would swallow it. Rewind so this |
| 203 | // first message is delivered; anything older stays history. |
| 204 | c.mu.Lock() |
| 205 | if f.ID != 0 && c.cursors[f.ThreadID] >= f.ID { |
| 206 | c.cursors[f.ThreadID] = f.ID - 1 |
| 207 | } |
| 208 | c.mu.Unlock() |
| 209 | } |
| 210 | c.deliver(f.ThreadID, f.ID, f.Blob) |
| 211 | } |
| 212 | |
| 213 | // chatPayload is the decrypted message shape a person's client renders. Typed |
| 214 | // payloads (connect.*, mini-app events) are protocol traffic, not chat lines. |
| 215 | type chatPayload struct { |
| 216 | Type string `json:"type"` |
| 217 | Name string `json:"name"` |
| 218 | Text string `json:"text"` |
| 219 | Ts int64 `json:"ts"` |
| 220 | Action bool `json:"action"` |
| 221 | Actions []map[string]any `json:"actions"` |
| 222 | } |
| 223 | |
| 224 | // deliver decrypts one message, advances the thread cursor, and hands it to |
| 225 | // OnMessage. The cursor gate drops duplicates (a reconnect's catch-up |
| 226 | // overlapping a live frame) so nothing prints twice. |
| 227 | func (c *Client) deliver(threadID string, id int64, blob string) { |
| 228 | c.mu.Lock() |
| 229 | entry, ok := c.keys[threadID] |
| 230 | if ok && id != 0 { |
| 231 | if id <= c.cursors[threadID] { |
| 232 | c.mu.Unlock() |
| 233 | return |
| 234 | } |
| 235 | c.cursors[threadID] = id |
| 236 | } |
| 237 | c.mu.Unlock() |
| 238 | if !ok { |
| 239 | return |
| 240 | } |
| 241 | var p chatPayload |
| 242 | if e2ee.DecryptJSON(entry.key, blob, &p) != nil { |
| 243 | return // e.g. a message from before we held the key |
| 244 | } |
| 245 | if p.Type != "" { |
| 246 | return // a typed payload (mini-app event, connect traffic), not chat text |
| 247 | } |
| 248 | if c.OnMessage != nil { |
| 249 | if p.Name == c.Session.Name { |
| 250 | // Our own message: let any in-flight Send finish recording its |
| 251 | // stored id before deciding whether this is its echo. |
| 252 | c.sendMu.Lock() |
| 253 | //lint:ignore SA2001 the lock is a barrier, not a critical section |
| 254 | c.sendMu.Unlock() |
| 255 | } |
| 256 | c.sentMu.Lock() |
| 257 | echo := c.sentIDs[id] |
| 258 | c.sentMu.Unlock() |
| 259 | c.OnMessage(Message{ |
| 260 | ThreadID: threadID, ID: id, Name: p.Name, Text: p.Text, Ts: p.Ts, |
| 261 | Mine: p.Name == c.Session.Name, Echo: echo, Action: p.Action, Actions: len(p.Actions), |
| 262 | }) |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | // serverThread is the /api/threads wire entry (db.go Thread). |
| 267 | type serverThread struct { |
| 268 | ID string `json:"id"` |
| 269 | Kind string `json:"kind"` |
| 270 | NameBlob string `json:"name_blob"` |
| 271 | Wrapped string `json:"wrapped"` |
| 272 | Members []string `json:"members"` |
| 273 | LastBlob string `json:"last_blob"` |
| 274 | LastAt int64 `json:"last_at"` |
| 275 | Hidden bool `json:"hidden"` |
| 276 | } |
| 277 | |
| 278 | func (c *Client) fetchThreads() ([]serverThread, error) { |
| 279 | c.init() |
| 280 | var tl struct { |
| 281 | Threads []serverThread `json:"threads"` |
| 282 | } |
| 283 | if err := c.get("/api/threads", &tl); err != nil { |
| 284 | return nil, err |
| 285 | } |
| 286 | // Cache any key we don't hold yet; a newly-seen thread's cursor starts at |
| 287 | // its latest message, so live delivery never replays history. |
| 288 | for _, t := range tl.Threads { |
| 289 | if t.Wrapped == "" { |
| 290 | continue |
| 291 | } |
| 292 | c.mu.Lock() |
| 293 | _, held := c.keys[t.ID] |
| 294 | c.mu.Unlock() |
| 295 | if held { |
| 296 | continue |
| 297 | } |
| 298 | keyB64, err := e2ee.UnwrapThreadKey(t.Wrapped, c.Session.UserPriv) |
| 299 | if err != nil { |
| 300 | c.logf("thread %s: %v", t.ID, err) |
| 301 | continue |
| 302 | } |
| 303 | key, err := e2ee.ImportKey(keyB64) |
| 304 | if err != nil { |
| 305 | c.logf("thread %s: %v", t.ID, err) |
| 306 | continue |
| 307 | } |
| 308 | var ml struct { |
| 309 | Messages []struct { |
| 310 | ID int64 `json:"id"` |
| 311 | } `json:"messages"` |
| 312 | } |
| 313 | latest := int64(0) |
| 314 | if err := c.get("/api/messages?thread="+url.QueryEscape(t.ID)+"&limit=1", &ml); err == nil { |
| 315 | for _, m := range ml.Messages { |
| 316 | latest = max(latest, m.ID) |
| 317 | } |
| 318 | } |
| 319 | c.mu.Lock() |
| 320 | if _, held := c.keys[t.ID]; !held { |
| 321 | c.keys[t.ID] = keyEntry{key: key, kind: t.Kind} |
| 322 | c.cursors[t.ID] = max(c.cursors[t.ID], latest) |
| 323 | } |
| 324 | c.mu.Unlock() |
| 325 | } |
| 326 | return tl.Threads, nil |
| 327 | } |
| 328 | |
| 329 | func (c *Client) loadThreads() error { |
| 330 | _, err := c.fetchThreads() |
| 331 | return err |
| 332 | } |
| 333 | |
| 334 | // catchUp delivers anything that arrived while disconnected. Cursors start at |
| 335 | // each thread's latest on first sight, so the initial connect backfills |
| 336 | // nothing. |
| 337 | func (c *Client) catchUp() { |
| 338 | c.mu.Lock() |
| 339 | after := make(map[string]int64, len(c.cursors)) |
| 340 | for id := range c.keys { |
| 341 | after[id] = c.cursors[id] |
| 342 | } |
| 343 | c.mu.Unlock() |
| 344 | for threadID, cursor := range after { |
| 345 | var ml struct { |
| 346 | Messages []struct { |
| 347 | ID int64 `json:"id"` |
| 348 | Blob string `json:"blob"` |
| 349 | } `json:"messages"` |
| 350 | } |
| 351 | path := fmt.Sprintf("/api/messages?thread=%s&after=%d", url.QueryEscape(threadID), cursor) |
| 352 | if err := c.get(path, &ml); err != nil { |
| 353 | c.logf("catchUp %s: %v", threadID, err) |
| 354 | continue |
| 355 | } |
| 356 | for _, m := range ml.Messages { |
| 357 | c.deliver(threadID, m.ID, m.Blob) |
| 358 | } |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | // Threads lists this member's chats, sidebar-ready: server order (pinned, then |
| 363 | // most recent), names decrypted — a group's from its name_blob, a DM's from |
| 364 | // the other member's roster label, a self app-thread's from its app title — |
| 365 | // and the latest line previewed. Hidden (closed) chats are skipped. |
| 366 | func (c *Client) Threads() ([]Thread, error) { |
| 367 | sts, err := c.fetchThreads() |
| 368 | if err != nil { |
| 369 | return nil, err |
| 370 | } |
| 371 | labels := c.rosterLabels() |
| 372 | me, _ := c.Me() |
| 373 | out := []Thread{} |
| 374 | for _, st := range sts { |
| 375 | if st.Hidden { |
| 376 | continue |
| 377 | } |
| 378 | t := Thread{ID: st.ID, Kind: st.Kind, LastAt: st.LastAt} |
| 379 | c.mu.Lock() |
| 380 | entry, held := c.keys[st.ID] |
| 381 | c.mu.Unlock() |
| 382 | if held && st.NameBlob != "" { |
| 383 | // A group's explicit name, or a self app-thread's app id + title |
| 384 | // (shell.js threadDisplayName). |
| 385 | var n struct { |
| 386 | Name string `json:"name"` |
| 387 | Title string `json:"title"` |
| 388 | App string `json:"app"` |
| 389 | } |
| 390 | if e2ee.DecryptJSON(entry.key, st.NameBlob, &n) == nil { |
| 391 | t.Name = n.Name |
| 392 | t.App = n.App |
| 393 | if t.Name == "" { |
| 394 | t.Name = n.Title |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | if t.Name == "" && st.Kind == "dm" { |
| 399 | for _, uid := range st.Members { |
| 400 | if uid != me && labels[uid] != "" { |
| 401 | t.Name = labels[uid] |
| 402 | break |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | if held && st.LastBlob != "" { |
| 407 | var p chatPayload |
| 408 | if e2ee.DecryptJSON(entry.key, st.LastBlob, &p) == nil && p.Type == "" { |
| 409 | t.LastName, t.LastText = p.Name, p.Text |
| 410 | } |
| 411 | } |
| 412 | out = append(out, t) |
| 413 | } |
| 414 | return out, nil |
| 415 | } |
| 416 | |
| 417 | // rosterLabels maps user id -> display name for everyone this member can see. |
| 418 | // Bots carry a plaintext label; people publish theirs encrypted under the |
| 419 | // instance key, so those decrypt only once another member's device has granted |
| 420 | // us that key — best-effort until then. |
| 421 | func (c *Client) rosterLabels() map[string]string { |
| 422 | labels := map[string]string{} |
| 423 | var rl struct { |
| 424 | Roster []struct { |
| 425 | UserID string `json:"user_id"` |
| 426 | Label string `json:"label"` |
| 427 | LabelBlob string `json:"label_blob"` |
| 428 | } `json:"roster"` |
| 429 | } |
| 430 | if err := c.get("/api/roster", &rl); err != nil { |
| 431 | c.logf("roster: %v", err) |
| 432 | return labels |
| 433 | } |
| 434 | instKey, _ := c.InstanceKey() |
| 435 | for _, e := range rl.Roster { |
| 436 | name := e.Label |
| 437 | if name == "" && e.LabelBlob != "" && instKey != nil { |
| 438 | var n string |
| 439 | if e2ee.DecryptJSON(instKey, e.LabelBlob, &n) == nil { |
| 440 | name = n |
| 441 | } |
| 442 | } |
| 443 | if name != "" { |
| 444 | labels[e.UserID] = name |
| 445 | } |
| 446 | } |
| 447 | return labels |
| 448 | } |
| 449 | |
| 450 | // RosterMember is one member of the space, with the fields the vault's `give` |
| 451 | // needs: who they are (UserID), their resolved display name, their roster |
| 452 | // PUBLIC key (to seal a handoff to), and whether they're a bot (IsAgent) — a |
| 453 | // locked vault must never hand its key to a machine member. |
| 454 | type RosterMember struct { |
| 455 | UserID string |
| 456 | Name string |
| 457 | PublicKey string |
| 458 | IsAgent bool |
| 459 | } |
| 460 | |
| 461 | // Roster returns the caller's visible roster with public keys — the CLI end of |
| 462 | // the web's roster read (same /api/roster, same name resolution: a bot's |
| 463 | // plaintext label, else the instance-key-encrypted label_blob). Used by |
| 464 | // `eleven vault give` to seal a handoff to a member's roster key. |
| 465 | func (c *Client) Roster() ([]RosterMember, error) { |
| 466 | c.init() |
| 467 | var rl struct { |
| 468 | Roster []struct { |
| 469 | UserID string `json:"user_id"` |
| 470 | Label string `json:"label"` |
| 471 | LabelBlob string `json:"label_blob"` |
| 472 | PublicKey string `json:"public_key"` |
| 473 | IsAgent bool `json:"is_agent"` |
| 474 | } `json:"roster"` |
| 475 | } |
| 476 | if err := c.get("/api/roster", &rl); err != nil { |
| 477 | return nil, err |
| 478 | } |
| 479 | instKey, _ := c.InstanceKey() |
| 480 | out := make([]RosterMember, 0, len(rl.Roster)) |
| 481 | for _, e := range rl.Roster { |
| 482 | name := e.Label |
| 483 | if name == "" && e.LabelBlob != "" && instKey != nil { |
| 484 | var n string |
| 485 | if e2ee.DecryptJSON(instKey, e.LabelBlob, &n) == nil { |
| 486 | name = n |
| 487 | } |
| 488 | } |
| 489 | out = append(out, RosterMember{UserID: e.UserID, Name: name, PublicKey: e.PublicKey, IsAgent: e.IsAgent}) |
| 490 | } |
| 491 | return out, nil |
| 492 | } |
| 493 | |
| 494 | // Me returns this member's user id (cached after the first call). |
| 495 | func (c *Client) Me() (string, error) { |
| 496 | if c.uid != "" { |
| 497 | return c.uid, nil |
| 498 | } |
| 499 | c.init() |
| 500 | var me struct { |
| 501 | UserID string `json:"user_id"` |
| 502 | } |
| 503 | if err := c.get("/api/me", &me); err != nil { |
| 504 | return "", err |
| 505 | } |
| 506 | c.uid = me.UserID |
| 507 | return c.uid, nil |
| 508 | } |
| 509 | |
| 510 | // History returns a thread's latest messages, oldest first, decrypted. |
| 511 | // Undecryptable or non-chat payloads are skipped. |
| 512 | func (c *Client) History(threadID string, limit int) ([]Message, error) { |
| 513 | key, err := c.threadKey(threadID) |
| 514 | if err != nil { |
| 515 | return nil, err |
| 516 | } |
| 517 | var ml struct { |
| 518 | Messages []struct { |
| 519 | ID int64 `json:"id"` |
| 520 | Blob string `json:"blob"` |
| 521 | } `json:"messages"` |
| 522 | } |
| 523 | path := fmt.Sprintf("/api/messages?thread=%s&limit=%d", url.QueryEscape(threadID), limit) |
| 524 | if err := c.get(path, &ml); err != nil { |
| 525 | return nil, err |
| 526 | } |
| 527 | var out []Message |
| 528 | for _, m := range ml.Messages { |
| 529 | var p chatPayload |
| 530 | if e2ee.DecryptJSON(key, m.Blob, &p) != nil || p.Type != "" { |
| 531 | continue |
| 532 | } |
| 533 | out = append(out, Message{ |
| 534 | ThreadID: threadID, ID: m.ID, Name: p.Name, Text: p.Text, Ts: p.Ts, |
| 535 | Mine: p.Name == c.Session.Name, Action: p.Action, Actions: len(p.Actions), |
| 536 | }) |
| 537 | } |
| 538 | return out, nil |
| 539 | } |
| 540 | |
| 541 | // Send encrypts text under the thread's key and posts it — the same wire shape |
| 542 | // the web composer sends, so no client can tell where a message was typed. |
| 543 | // Usable without Run (a one-shot `eleven send`). |
| 544 | func (c *Client) Send(threadID, text string) error { |
| 545 | key, err := c.threadKey(threadID) |
| 546 | if err != nil { |
| 547 | return err |
| 548 | } |
| 549 | // Held until the stored id is recorded — see sendMu. |
| 550 | c.sendMu.Lock() |
| 551 | defer c.sendMu.Unlock() |
| 552 | blob, err := e2ee.EncryptJSON(key, map[string]any{ |
| 553 | "name": c.Session.Name, "text": text, "ts": time.Now().UnixMilli(), |
| 554 | }) |
| 555 | if err != nil { |
| 556 | return err |
| 557 | } |
| 558 | body, err := json.Marshal(map[string]string{"thread_id": threadID, "blob": blob}) |
| 559 | if err != nil { |
| 560 | return err |
| 561 | } |
| 562 | var stored struct { |
| 563 | ID int64 `json:"id"` |
| 564 | } |
| 565 | if err := c.postJSON("/api/messages?token="+url.QueryEscape(c.Session.Token), body, &stored); err != nil { |
| 566 | return err |
| 567 | } |
| 568 | // Remember what this process sent, so its own echo is distinguishable from |
| 569 | // the same member's sends on another device (Message.Echo vs Mine). |
| 570 | if stored.ID != 0 { |
| 571 | c.sentMu.Lock() |
| 572 | if c.sentIDs == nil { |
| 573 | c.sentIDs = map[int64]bool{} |
| 574 | } |
| 575 | c.sentIDs[stored.ID] = true |
| 576 | c.sentMu.Unlock() |
| 577 | } |
| 578 | return nil |
| 579 | } |
| 580 | |
| 581 | // threadKey returns the unwrapped key for a thread, loading threads once if it |
| 582 | // isn't cached yet. |
| 583 | func (c *Client) threadKey(threadID string) ([]byte, error) { |
| 584 | c.init() |
| 585 | c.mu.Lock() |
| 586 | entry, ok := c.keys[threadID] |
| 587 | c.mu.Unlock() |
| 588 | if !ok { |
| 589 | if err := c.loadThreads(); err != nil { |
| 590 | return nil, err |
| 591 | } |
| 592 | c.mu.Lock() |
| 593 | entry, ok = c.keys[threadID] |
| 594 | c.mu.Unlock() |
| 595 | } |
| 596 | if !ok { |
| 597 | return nil, fmt.Errorf("client: no key for thread %s (not a member, or the key hasn't been granted yet)", threadID) |
| 598 | } |
| 599 | return entry.key, nil |
| 600 | } |
| 601 | |
| 602 | // InstanceKey unwraps this member's copy of the instance key — nil error only |
| 603 | // once another member's device has granted it (grants are how keys reach a |
| 604 | // fresh member; there may be nothing to unwrap in the first minutes). |
| 605 | func (c *Client) InstanceKey() ([]byte, error) { |
| 606 | c.init() |
| 607 | var ik struct { |
| 608 | Wrapped string `json:"wrapped"` |
| 609 | } |
| 610 | if err := c.get("/api/instance-key", &ik); err != nil { |
| 611 | return nil, err |
| 612 | } |
| 613 | if ik.Wrapped == "" { |
| 614 | return nil, fmt.Errorf("client: no instance key granted yet") |
| 615 | } |
| 616 | keyB64, err := e2ee.UnwrapThreadKey(ik.Wrapped, c.Session.UserPriv) |
| 617 | if err != nil { |
| 618 | return nil, err |
| 619 | } |
| 620 | return e2ee.ImportKey(keyB64) |
| 621 | } |
| 622 | |
| 623 | // PublishLabel publishes this member's display name to the roster, encrypted |
| 624 | // under the instance key (what the web does after joining — the server never |
| 625 | // sees the plaintext name). Fails until the instance key has been granted. |
| 626 | func (c *Client) PublishLabel() error { |
| 627 | instKey, err := c.InstanceKey() |
| 628 | if err != nil { |
| 629 | return err |
| 630 | } |
| 631 | blob, err := e2ee.EncryptJSON(instKey, c.Session.Name) |
| 632 | if err != nil { |
| 633 | return err |
| 634 | } |
| 635 | body, err := json.Marshal(map[string]string{"token": c.Session.Token, "label_blob": blob}) |
| 636 | if err != nil { |
| 637 | return err |
| 638 | } |
| 639 | return c.postJSON("/api/label", body, nil) |
| 640 | } |
| 641 | |
| 642 | func (c *Client) send(v any) error { |
| 643 | c.wmu.Lock() |
| 644 | defer c.wmu.Unlock() |
| 645 | conn := c.conn |
| 646 | if conn == nil { |
| 647 | return fmt.Errorf("not connected") |
| 648 | } |
| 649 | data, err := json.Marshal(v) |
| 650 | if err != nil { |
| 651 | return err |
| 652 | } |
| 653 | ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) |
| 654 | defer cancel() |
| 655 | return conn.Write(ctx, websocket.MessageText, data) |
| 656 | } |
| 657 | |
| 658 | func (c *Client) get(path string, out any) error { |
| 659 | c.init() |
| 660 | sep := "?" |
| 661 | if strings.Contains(path, "?") { |
| 662 | sep = "&" |
| 663 | } |
| 664 | resp, err := c.hc.Get(c.Base + path + sep + "token=" + url.QueryEscape(c.Session.Token)) |
| 665 | if err != nil { |
| 666 | return err |
| 667 | } |
| 668 | defer resp.Body.Close() |
| 669 | if resp.StatusCode != http.StatusOK { |
| 670 | return fmt.Errorf("%s: server %d", path, resp.StatusCode) |
| 671 | } |
| 672 | return json.NewDecoder(resp.Body).Decode(out) |
| 673 | } |
| 674 | |
| 675 | func (c *Client) postJSON(path string, body []byte, out any) error { |
| 676 | c.init() |
| 677 | resp, err := c.hc.Post(c.Base+path, "application/json", strings.NewReader(string(body))) |
| 678 | if err != nil { |
| 679 | return err |
| 680 | } |
| 681 | defer resp.Body.Close() |
| 682 | if resp.StatusCode != http.StatusOK { |
| 683 | return fmt.Errorf("%s: server %d", path, resp.StatusCode) |
| 684 | } |
| 685 | if out == nil { |
| 686 | return nil |
| 687 | } |
| 688 | return json.NewDecoder(resp.Body).Decode(out) |
| 689 | } |
| 690 | |
| 691 | func (c *Client) logf(format string, args ...any) { |
| 692 | if c.Logf != nil { |
| 693 | c.Logf(format, args...) |
| 694 | } |
| 695 | } |
| 696 | |
amadan