feat(jitsi): add Jitsi auth provider and engine

2026-05-26 15:13:40 +00:00 · 2026-05-15 15:37:58 +03:00
parent af87120f73
commit eceeaeba92
11 changed files with 1003 additions and 13 deletions
--- a/internal/engine/jitsi/helpers_test.go
+++ b/internal/engine/jitsi/helpers_test.go
@@ -0,0 +1,20 @@
+package jitsi
+
+import (
+	"encoding/base64"
+	"testing"
+
+	"github.com/zarazaex69/j"
+)
+
+func encodeForTest(t *testing.T, data []byte) string {
+	t.Helper()
+	return base64.StdEncoding.EncodeToString(data)
+}
+
+func makeBridgeMessage(class string, fields map[string]any) j.BridgeMessage {
+	return j.BridgeMessage{
+		Class:  class,
+		Fields: fields,
+	}
+}
--- a/internal/engine/jitsi/jitsi.go
+++ b/internal/engine/jitsi/jitsi.go
@@ -0,0 +1,543 @@
+// Package jitsi implements an engine.Session backed by the Jitsi Meet
+// XMPP/Jingle/colibri-ws stack via the github.com/zarazaex69/j library.
+//
+// The engine speaks the wire protocol of a self-hosted Jitsi instance: it
+// joins the MUC, waits for a Jingle session-initiate from Jicofo, opens the
+// JVB bridge channel (colibri-ws) for byte transport, and optionally
+// negotiates a pion *webrtc.PeerConnection for video tracks.
+//
+// Service-specific bits (URL parsing) live in the auth/jitsi package; this
+// engine is told the host and room name through engine.Config (URL carries
+// the host string, Extra["room"] carries the room name).
+//
+// The Jingle session-initiate is only delivered by Jicofo once at least one
+// other participant is present in the conference, mirroring the Telemost /
+// SaluteJazz two-peer requirement that olcrtc already accommodates.
+package jitsi
+
+import (
+	"context"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/openlibrecommunity/olcrtc/internal/engine"
+	"github.com/openlibrecommunity/olcrtc/internal/logger"
+	"github.com/pion/webrtc/v4"
+	"github.com/zarazaex69/j"
+)
+
+const (
+	defaultSendQueueSize = 5000
+	// bridgeMaxMessageSize is the practical upper bound on a single colibri-ws
+	// payload. JVB enforces a max-message-size around 16 KiB; payloads above
+	// that cause the bridge to drop the websocket. The default datachannel
+	// transport in olcrtc already uses 12 KiB chunks, well under this limit.
+	bridgeMaxMessageSize = 16 * 1024
+	bridgeOpenTimeout    = 30 * time.Second
+	defaultNick          = "olcrtc"
+	credentialKeyRoom    = "room"
+	videoTrackName       = "videochannel"
+)
+
+var (
+	// ErrSessionClosed is returned when an operation is attempted on a closed session.
+	ErrSessionClosed = errors.New("jitsi session closed")
+	// ErrSendQueueFull is returned when the outbound queue cannot accept more data.
+	ErrSendQueueFull = errors.New("jitsi send queue full")
+	// ErrBridgeNotReady is returned when send is attempted before the bridge is open.
+	ErrBridgeNotReady = errors.New("jitsi bridge not ready")
+	// ErrSendTooLarge is returned when a single payload exceeds the JVB max-message-size limit.
+	ErrSendTooLarge = errors.New("jitsi payload exceeds bridge max-message-size")
+	// ErrHostRequired is returned when no Jitsi host was supplied.
+	ErrHostRequired = errors.New("jitsi host required")
+	// ErrRoomRequired is returned when no Jitsi room was supplied.
+	ErrRoomRequired = errors.New("jitsi room required")
+)
+
+// Session is the Jitsi engine handle.
+type Session struct {
+	host string
+	room string
+	name string
+
+	onData          func([]byte)
+	onReconnect     func(*webrtc.DataChannel)
+	shouldReconnect func() bool
+	onEnded         func(string)
+
+	jSess atomic.Pointer[j.Session]
+
+	pcMu sync.Mutex
+	pc   *webrtc.PeerConnection
+
+	sendQueue   chan []byte
+	bridgeReady atomic.Bool
+	closed      atomic.Bool
+	done        chan struct{}
+	doneOnce    sync.Once
+	cancel      context.CancelFunc
+	runCtx      context.Context //nolint:containedctx // engine owns the supervisor lifetime
+	wg          sync.WaitGroup
+
+	videoTrackMu sync.RWMutex
+	videoTracks  []webrtc.TrackLocal
+	onVideoTrack func(*webrtc.TrackRemote, *webrtc.RTPReceiver)
+}
+
+// New creates a new Jitsi engine session.
+//
+// cfg.URL carries the Jitsi host (e.g. "meet.cryptopro.ru") — populated by the
+// jitsi auth provider after parsing the user-supplied room URL. cfg.Extra
+// must contain the room name under the "room" key.
+func New(_ context.Context, cfg engine.Config) (engine.Session, error) {
+	host := normaliseHost(cfg.URL)
+	if host == "" {
+		return nil, ErrHostRequired
+	}
+	var room string
+	if cfg.Extra != nil {
+		room = strings.TrimSpace(cfg.Extra[credentialKeyRoom])
+	}
+	if room == "" {
+		return nil, ErrRoomRequired
+	}
+	name := sanitiseNick(cfg.Name)
+	if name == "" {
+		name = defaultNick
+	}
+
+	runCtx, cancel := context.WithCancel(context.Background())
+	return &Session{
+		host:      host,
+		room:      room,
+		name:      name,
+		onData:    cfg.OnData,
+		sendQueue: make(chan []byte, defaultSendQueueSize),
+		done:      make(chan struct{}),
+		cancel:    cancel,
+		runCtx:    runCtx,
+	}, nil
+}
+
+// sanitiseNick reduces a display name to a 7-bit ASCII slug acceptable to
+// the j library's MUC presence helper. The helper currently uses byte-level
+// slicing on the supplied name to derive a stats-id, so multi-byte UTF-8
+// inputs (e.g. Cyrillic) get sliced mid-codepoint and Prosody silently
+// rejects the resulting presence stanza.
+//
+// Non-ASCII characters are dropped; spaces and punctuation are normalised
+// to '-'. The result is bounded to 16 characters.
+func sanitiseNick(raw string) string {
+	const maxNickLen = 16
+	var b strings.Builder
+	b.Grow(len(raw))
+	prevDash := false
+	for _, r := range raw {
+		switch {
+		case r >= 'a' && r <= 'z',
+			r >= 'A' && r <= 'Z',
+			r >= '0' && r <= '9':
+			b.WriteRune(r)
+			prevDash = false
+		case r == '-' || r == '_':
+			b.WriteRune(r)
+			prevDash = false
+		default:
+			if !prevDash && b.Len() > 0 {
+				b.WriteRune('-')
+				prevDash = true
+			}
+		}
+		if b.Len() >= maxNickLen {
+			break
+		}
+	}
+	out := strings.Trim(b.String(), "-")
+	if out == "" {
+		return ""
+	}
+	return out
+}
+
+// Capabilities reports what this engine can do.
+func (s *Session) Capabilities() engine.Capabilities {
+	return engine.Capabilities{ByteStream: true, VideoTrack: true}
+}
+
+// Connect joins the Jitsi conference, optionally opens the bridge channel,
+// and (if video tracks are pending or a remote handler is set) negotiates a
+// pion PeerConnection.
+func (s *Session) Connect(ctx context.Context) error {
+	if s.closed.Load() {
+		return ErrSessionClosed
+	}
+
+	logger.Infof("jitsi: joining %s/%s as %s …", s.host, s.room, s.name)
+	jSess, err := j.Join(ctx, j.Config{
+		Host:  s.host,
+		Room:  s.room,
+		Nick:  s.name,
+		Debug: logger.IsVerbose(),
+	})
+	if err != nil {
+		return fmt.Errorf("jitsi join: %w", err)
+	}
+	logger.Infof("jitsi: joined %s/%s; colibri-ws=%s", s.host, s.room, jSess.ColibriWS)
+	s.jSess.Store(jSess)
+
+	if s.onData != nil {
+		bctx, bcancel := context.WithTimeout(ctx, bridgeOpenTimeout)
+		err := jSess.OpenBridge(bctx)
+		bcancel()
+		if err != nil {
+			_ = jSess.Close()
+			s.jSess.Store(nil)
+			return fmt.Errorf("open bridge: %w", err)
+		}
+		s.bridgeReady.Store(true)
+		logger.Infof("jitsi: bridge open (endpoints=%v)", jSess.Endpoints())
+	}
+
+	if s.shouldNegotiatePC() {
+		if err := s.negotiatePC(ctx, jSess); err != nil {
+			_ = jSess.Close()
+			s.jSess.Store(nil)
+			s.bridgeReady.Store(false)
+			return err
+		}
+	}
+
+	s.wg.Add(2)
+	go s.sendLoop()
+	go s.recvLoop()
+	return nil
+}
+
+func (s *Session) shouldNegotiatePC() bool {
+	s.videoTrackMu.RLock()
+	defer s.videoTrackMu.RUnlock()
+	return len(s.videoTracks) > 0 || s.onVideoTrack != nil
+}
+
+func (s *Session) videoTrackHandler() func(*webrtc.TrackRemote, *webrtc.RTPReceiver) {
+	s.videoTrackMu.RLock()
+	defer s.videoTrackMu.RUnlock()
+	return s.onVideoTrack
+}
+
+func (s *Session) negotiatePC(ctx context.Context, jSess *j.Session) error {
+	settings := webrtc.SettingEngine{}
+	settings.LoggerFactory = logger.NewPionLoggerFactory()
+	api := webrtc.NewAPI(webrtc.WithSettingEngine(settings))
+
+	// Jicofo emits Plan B style SDP with separate <content> sections per
+	// media kind and SSRC-keyed source descriptors. pion's default
+	// UnifiedPlan parser rejects this with "remote SessionDescription
+	// semantics does not match configuration", so we explicitly request
+	// Plan B for the conference PeerConnection.
+	pcConfig := jSess.IceConfig()
+	pcConfig.SDPSemantics = webrtc.SDPSemanticsPlanB
+
+	pc, err := api.NewPeerConnection(pcConfig)
+	if err != nil {
+		return fmt.Errorf("new pc: %w", err)
+	}
+
+	s.videoTrackMu.RLock()
+	for _, track := range s.videoTracks {
+		if _, addErr := pc.AddTrack(track); addErr != nil {
+			s.videoTrackMu.RUnlock()
+			_ = pc.Close()
+			return fmt.Errorf("add track: %w", addErr)
+		}
+	}
+	s.videoTrackMu.RUnlock()
+
+	pc.OnTrack(func(track *webrtc.TrackRemote, recv *webrtc.RTPReceiver) {
+		if track.Kind() != webrtc.RTPCodecTypeVideo {
+			return
+		}
+		if cb := s.videoTrackHandler(); cb != nil {
+			cb(track, recv)
+		}
+	})
+	pc.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
+		logger.Debugf("jitsi pc state: %s", state.String())
+		if state == webrtc.PeerConnectionStateFailed && !s.closed.Load() && s.onEnded != nil {
+			s.onEnded("jitsi peer connection failed")
+		}
+	})
+
+	neg := jSess.Negotiator()
+	neg.PC = pc
+	if err := neg.Accept(ctx); err != nil {
+		_ = pc.Close()
+		return fmt.Errorf("session-accept: %w", err)
+	}
+
+	s.pcMu.Lock()
+	s.pc = pc
+	s.pcMu.Unlock()
+	return nil
+}
+
+// Send queues data for transmission over the bridge.
+//
+// Send is non-blocking: data is enqueued onto the engine's outbound channel
+// and a background goroutine pumps the queue into the colibri-ws bridge with
+// the bridge's own backpressure window.
+func (s *Session) Send(data []byte) error {
+	if s.closed.Load() {
+		return ErrSessionClosed
+	}
+	if !s.bridgeReady.Load() {
+		return ErrBridgeNotReady
+	}
+	if len(data) > bridgeMaxMessageSize {
+		return ErrSendTooLarge
+	}
+	select {
+	case s.sendQueue <- data:
+		return nil
+	case <-s.done:
+		return ErrSessionClosed
+	default:
+		return ErrSendQueueFull
+	}
+}
+
+func (s *Session) sendLoop() {
+	defer s.wg.Done()
+	for {
+		select {
+		case <-s.done:
+			return
+		case data, ok := <-s.sendQueue:
+			if !ok {
+				return
+			}
+			jSess := s.jSess.Load()
+			if jSess == nil {
+				return
+			}
+			if err := jSess.BridgeSendRaw("", data); err != nil {
+				if s.closed.Load() {
+					return
+				}
+				logger.Debugf("jitsi bridge send: %v", err)
+			}
+		}
+	}
+}
+
+func (s *Session) recvLoop() {
+	defer s.wg.Done()
+
+	jSess := s.jSess.Load()
+	if jSess == nil || s.onData == nil || !s.bridgeReady.Load() {
+		return
+	}
+	msgs := jSess.BridgeMessages()
+	if msgs == nil {
+		return
+	}
+	for {
+		select {
+		case <-s.done:
+			return
+		case msg, ok := <-msgs:
+			if !ok {
+				if !s.closed.Load() {
+					s.signalEnded("jitsi bridge closed")
+				}
+				return
+			}
+			payload := decodeRaw(msg)
+			if payload == nil {
+				continue
+			}
+			s.onData(payload)
+		}
+	}
+}
+
+// decodeRaw extracts the bytes from an EndpointMessage produced by the j
+// library's BridgeSendRaw helper. Mirrors the unexported colibri.DecodeRaw —
+// the j library's BridgeMessage type alias keeps the necessary fields public,
+// but the helper itself lives in an internal package.
+func decodeRaw(m j.BridgeMessage) []byte {
+	if m.Class != "EndpointMessage" {
+		return nil
+	}
+	enc, ok := m.Fields["raw"].(string)
+	if !ok {
+		return nil
+	}
+	out, err := base64.StdEncoding.DecodeString(enc)
+	if err != nil {
+		return nil
+	}
+	return out
+}
+
+// Close terminates the session and releases resources.
+func (s *Session) Close() error {
+	if !s.closed.CompareAndSwap(false, true) {
+		return nil
+	}
+
+	if s.cancel != nil {
+		s.cancel()
+	}
+	s.doneOnce.Do(func() { close(s.done) })
+
+	s.pcMu.Lock()
+	pc := s.pc
+	s.pc = nil
+	s.pcMu.Unlock()
+	if pc != nil {
+		_ = pc.Close()
+	}
+
+	jSess := s.jSess.Swap(nil)
+	if jSess != nil {
+		_ = jSess.Close()
+	}
+
+	s.bridgeReady.Store(false)
+
+	stopped := make(chan struct{})
+	go func() {
+		s.wg.Wait()
+		close(stopped)
+	}()
+	select {
+	case <-stopped:
+	case <-time.After(2 * time.Second):
+	}
+	return nil
+}
+
+// SetReconnectCallback registers a callback for reconnection events.
+//
+// The Jitsi engine itself does not currently drive a reconnect loop; the
+// callback is stored for API parity and wired through the carrier adapter
+// for future use.
+func (s *Session) SetReconnectCallback(cb func(*webrtc.DataChannel)) { s.onReconnect = cb }
+
+// SetShouldReconnect stores the reconnect predicate (kept for API parity).
+func (s *Session) SetShouldReconnect(fn func() bool) { s.shouldReconnect = fn }
+
+// SetEndedCallback registers a function to call when the session ends.
+func (s *Session) SetEndedCallback(cb func(string)) { s.onEnded = cb }
+
+// WatchConnection blocks until the session is closed, the parent context
+// fires, or the bridge tears down.
+func (s *Session) WatchConnection(ctx context.Context) {
+	select {
+	case <-ctx.Done():
+		return
+	case <-s.done:
+		return
+	}
+}
+
+// CanSend reports whether the session is ready to accept new data.
+func (s *Session) CanSend() bool {
+	if s.closed.Load() {
+		return false
+	}
+	if s.onData == nil {
+		// pure video mode — readiness driven by PC connection state
+		s.pcMu.Lock()
+		ready := s.pc != nil && s.pc.ConnectionState() == webrtc.PeerConnectionStateConnected
+		s.pcMu.Unlock()
+		return ready
+	}
+	return s.bridgeReady.Load()
+}
+
+// GetSendQueue exposes the outbound queue for upstream metrics.
+func (s *Session) GetSendQueue() chan []byte { return s.sendQueue }
+
+// GetBufferedAmount returns a coarse estimate of bytes pending on the wire.
+//
+// The j library's bridge connection only exposes message-count depth, so we
+// approximate bytes by multiplying queue depth by the bridge max-message-size.
+// This is enough for upper-layer pacing heuristics; engines that need
+// byte-accurate pressure should consult GetSendQueue directly.
+func (s *Session) GetBufferedAmount() uint64 {
+	jSess := s.jSess.Load()
+	if jSess == nil {
+		return 0
+	}
+	depth := jSess.BridgeSendQueueDepth()
+	if depth <= 0 {
+		return 0
+	}
+	return uint64(depth) * uint64(bridgeMaxMessageSize) //nolint:gosec // depth is small and bounded by queue cap
+}
+
+// AddVideoTrack publishes a video track to the Jitsi conference.
+//
+// Tracks added before Connect are sent as part of the session-accept SDP
+// (so Jicofo announces them to other participants automatically). Tracks
+// added afterwards are attached to the live PeerConnection — Jitsi's
+// source-add flow is not yet implemented in this engine, so late tracks
+// will only be visible on the next reconnect.
+func (s *Session) AddVideoTrack(track webrtc.TrackLocal) error {
+	s.videoTrackMu.Lock()
+	s.videoTracks = append(s.videoTracks, track)
+	s.videoTrackMu.Unlock()
+
+	s.pcMu.Lock()
+	pc := s.pc
+	s.pcMu.Unlock()
+	if pc == nil {
+		return nil
+	}
+	if _, err := pc.AddTrack(track); err != nil {
+		return fmt.Errorf("add track: %w", err)
+	}
+	return nil
+}
+
+// SetVideoTrackHandler registers a callback invoked on every remote video
+// track received from the conference.
+func (s *Session) SetVideoTrackHandler(cb func(*webrtc.TrackRemote, *webrtc.RTPReceiver)) {
+	s.videoTrackMu.Lock()
+	defer s.videoTrackMu.Unlock()
+	s.onVideoTrack = cb
+}
+
+func (s *Session) signalEnded(reason string) {
+	s.bridgeReady.Store(false)
+	if s.onEnded != nil {
+		s.onEnded(reason)
+	}
+}
+
+// normaliseHost strips an optional scheme and trailing slashes off a Jitsi
+// host string. The j library expects a bare host; auth providers might pass
+// a full URL through verbatim.
+func normaliseHost(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if idx := strings.Index(raw, "://"); idx >= 0 {
+		raw = raw[idx+3:]
+	}
+	raw = strings.TrimPrefix(raw, "//")
+	raw = strings.TrimSuffix(raw, "/")
+	if i := strings.Index(raw, "/"); i >= 0 {
+		raw = raw[:i]
+	}
+	return raw
+}
+
+func init() { //nolint:gochecknoinits // engine registration is the canonical Go pattern for plugins
+	engine.Register("jitsi", New)
+}
--- a/internal/engine/jitsi/jitsi_test.go
+++ b/internal/engine/jitsi/jitsi_test.go
@@ -0,0 +1,147 @@
+package jitsi
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/openlibrecommunity/olcrtc/internal/engine"
+)
+
+func TestNormaliseHost(t *testing.T) {
+	tests := []struct {
+		raw  string
+		want string
+	}{
+		{"meet.example.com", "meet.example.com"},
+		{"https://meet.example.com", "meet.example.com"},
+		{"https://meet.example.com/", "meet.example.com"},
+		{"https://meet.example.com/path", "meet.example.com"},
+		{"//meet.example.com", "meet.example.com"},
+		{"  https://meet.example.com  ", "meet.example.com"},
+		{"", ""},
+	}
+	for _, tc := range tests {
+		t.Run(tc.raw, func(t *testing.T) {
+			if got := normaliseHost(tc.raw); got != tc.want {
+				t.Fatalf("normaliseHost(%q) = %q, want %q", tc.raw, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestDecodeRaw(t *testing.T) {
+	const payload = "hello world"
+	raw := encodeForTest(t, []byte(payload))
+
+	got := decodeRaw(makeBridgeMessage("EndpointMessage", map[string]any{"raw": raw}))
+	if string(got) != payload {
+		t.Fatalf("decodeRaw = %q, want %q", got, payload)
+	}
+
+	if got := decodeRaw(makeBridgeMessage("OtherClass", map[string]any{"raw": raw})); got != nil {
+		t.Fatalf("decodeRaw(other class) = %q, want nil", got)
+	}
+	if got := decodeRaw(makeBridgeMessage("EndpointMessage", map[string]any{})); got != nil {
+		t.Fatalf("decodeRaw(no raw) = %q, want nil", got)
+	}
+	if got := decodeRaw(makeBridgeMessage("EndpointMessage", map[string]any{"raw": "not-base64!!!"})); got != nil {
+		t.Fatalf("decodeRaw(bad base64) = %q, want nil", got)
+	}
+}
+
+func TestNewRequiresHost(t *testing.T) {
+	_, err := New(context.Background(), engine.Config{
+		Extra: map[string]string{"room": "myroom"},
+	})
+	if !errors.Is(err, ErrHostRequired) {
+		t.Fatalf("err = %v, want ErrHostRequired", err)
+	}
+}
+
+func TestNewRequiresRoom(t *testing.T) {
+	_, err := New(context.Background(), engine.Config{
+		URL: "meet.example.com",
+	})
+	if !errors.Is(err, ErrRoomRequired) {
+		t.Fatalf("err = %v, want ErrRoomRequired", err)
+	}
+}
+
+func TestNewSucceeds(t *testing.T) {
+	sess, err := New(context.Background(), engine.Config{
+		URL:   "https://meet.example.com",
+		Extra: map[string]string{"room": "myroom"},
+		Name:  "olcrtc-test",
+	})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer func() { _ = sess.Close() }()
+	caps := sess.Capabilities()
+	if !caps.ByteStream || !caps.VideoTrack {
+		t.Fatalf("Capabilities = %+v, want ByteStream && VideoTrack", caps)
+	}
+}
+
+func TestSendBeforeConnect(t *testing.T) {
+	sess, err := New(context.Background(), engine.Config{
+		URL:    "meet.example.com",
+		Extra:  map[string]string{"room": "myroom"},
+		OnData: func([]byte) {},
+	})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	defer func() { _ = sess.Close() }()
+	if err := sess.Send([]byte("data")); !errors.Is(err, ErrBridgeNotReady) {
+		t.Fatalf("Send err = %v, want ErrBridgeNotReady", err)
+	}
+}
+
+func TestSendAfterClose(t *testing.T) {
+	sess, err := New(context.Background(), engine.Config{
+		URL:   "meet.example.com",
+		Extra: map[string]string{"room": "myroom"},
+	})
+	if err != nil {
+		t.Fatalf("New: %v", err)
+	}
+	if err := sess.Close(); err != nil {
+		t.Fatalf("Close: %v", err)
+	}
+	if err := sess.Send([]byte("data")); !errors.Is(err, ErrSessionClosed) {
+		t.Fatalf("Send err = %v, want ErrSessionClosed", err)
+	}
+}
+
+func TestSanitiseNick(t *testing.T) {
+	tests := []struct {
+		raw  string
+		want string
+	}{
+		{"alice", "alice"},
+		{"Alice Smith", "Alice-Smith"},
+		{"Конрад Олег", ""},
+		{"olcrtc-bot42", "olcrtc-bot42"},
+		{"  bob  ", "bob"},
+		{"$$$ %%%", ""},
+		{"verylongnicknamethatexceedslimit", "verylongnicknamet"[:16]},
+	}
+	for _, tc := range tests {
+		t.Run(tc.raw, func(t *testing.T) {
+			if got := sanitiseNick(tc.raw); got != tc.want {
+				t.Fatalf("sanitiseNick(%q) = %q, want %q", tc.raw, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestEngineRegistration(t *testing.T) {
+	if _, err := engine.New(context.Background(), "jitsi", engine.Config{
+		URL:   "meet.example.com",
+		Extra: map[string]string{"room": "myroom"},
+	}); err != nil {
+		t.Fatalf("engine.New(jitsi) = %v, want nil", err)
+	}
+}