foxyzandClaude Opus 5.5
4d00b7455e
- One server per app run (loopback, no password); Invite attaches an all-interfaces listener to the same server and Stop sharing detaches it (guests told with 4016); members, media and Up next never reset. No solo mode: you're home on your own server unless in a friend's. - Navigation: none / yours / friend; a join passes a version gate on /health first (clear "they/you need to update", update offer). - Invite as a value (host, port, name, password flag, version, fp reserved); addresses filtered (loopback, link-local, 198.18/15, bridges) and ranked; Sharing chip, Copy invite, Stop sharing. - Alone looks like a plain player (alone replaces solo). - AppGraph builds and disposes systems; widgets use AppScope; SessionState deleted; a test caps the remaining singletons. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1095 lines
45 KiB
Dart
1095 lines
45 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:math';
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import 'dart:typed_data';
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import 'package:relic/relic.dart';
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import 'package:sync_relay_core/core.dart';
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import 'package:web_socket/web_socket.dart';
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import 'queue_ops.dart';
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import 'relay_routes.dart';
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import 'relay_stats.dart';
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import 'session.dart';
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final _hubLog = createLogger('server_hub');
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class ServerHub {
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final SessionMap sessions;
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final String expectedSecret;
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/// See [AppConfig.hostKey]; empty means nobody is the host.
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final String hostKey;
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final SyncEngine engine;
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/// The `/sync` socket of each member that has one, by token; a `gone`
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/// member has none.
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final Map<String, RelicWebSocket> sockets = {};
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/// The server's Jellyfin login for the `/j/...` relay; null = no relay.
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JellyfinCredential? jellyfin;
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/// Reads web pages for "the server fetches it"; null = files only.
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final YtDlp? ytDlp;
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/// Random per server boot (`welcome.instance`).
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final String instance = _randomId();
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ServerHub(this.sessions, this.expectedSecret,
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{SyncEngine? engine, this.hostKey = '', this.jellyfin, this.ytDlp})
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: engine = engine ?? SyncEngine() {
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this.engine
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..onGone = _memberGone
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..onLeft = _memberLeft;
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}
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static String _randomId() {
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final r = Random.secure();
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return base64Url.encode(List<int>.generate(12, (_) => r.nextInt(256))).replaceAll('=', '');
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}
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/// A member went `gone`: a socket still open (silent) is closed; a
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/// relay it serves goes on from its buffer (`media.relay.sourceGone`).
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void _memberGone(EngineMember m) {
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_hubLog.info('gone ${m.name} (${m.id})');
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final ws = sockets.remove(m.token);
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if (ws != null) unawaited(closeWith(ws, CloseCodes.silent, 'silent'));
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refreshRelaySource();
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}
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/// A member left for good (`bye`, grace over): its token stops working,
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/// a relay it serves ends.
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void _memberLeft(EngineMember m) {
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_hubLog.info('leave ${m.name} (${m.id})');
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final ws = sockets.remove(m.token);
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if (ws != null) unawaited(closeWith(ws, CloseCodes.left, 'left'));
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session.tokens.remove(m.token);
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final r = relay;
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if (r != null && !r.fetch && r.sourceToken == m.token) {
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_endRelay(r, 'its source left', sourceGone: true, since: m.goneSince ?? engine.now);
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}
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}
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/// The current relay ends (its source left, or sent another media):
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/// the buffer goes, `/r` answers 404, `media.relay` stays with `live`
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/// false.
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void _endRelay(ActiveRelay r, String why, {bool sourceGone = false, DateTime? since}) {
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if (!identical(relay, r)) return;
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_hubLog.info('relay of "${r.name}" ended: $why');
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setRelay(null);
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final m = engine.media;
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final was = m?.relay;
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if (m != null && was != null) {
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engine.media = m.copyWith(
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relay: was.copyWith(live: false, rate: 0, sourceGone: sourceGone, sourceGoneSince: since));
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}
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}
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/// The source of [r] sent an `info` unlike its first (another media):
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/// the relay ends (warm: dropped, made again from the next `info`).
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void relayOtherMedia(ActiveRelay r) {
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if (identical(warm, r)) {
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_setWarm(null);
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} else {
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_endRelay(r, 'its source sent another media');
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}
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changed();
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}
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/// `media.relay.sourceGone` / `sourceGoneSince` follow the current
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/// relay's source member (`gone` or back).
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void refreshRelaySource() {
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final r = relay, m = engine.media;
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final was = m?.relay;
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if (r == null || m == null || was == null || r.fetch || r.sourceToken == null) return;
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final src = engine.members[r.sourceToken];
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final gone = src == null || src.presence == Presence.gone;
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if (gone == was.sourceGone) return;
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_hubLog.info('relay of "${r.name}": source ${gone ? 'gone, viewers play what is buffered' : 'back'}');
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engine.media = m.copyWith(relay: was.copyWith(sourceGone: gone, sourceGoneSince: src?.goneSince ?? engine.now));
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}
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bool get _sourceGone => engine.media?.relay?.sourceGone ?? false;
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/// The current media is a Jellyfin ref on the server [jellyfin] logs in to.
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bool get relayAvailable => _onLogin(session.media?.jellyfin);
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/// Up next's first item is a Jellyfin ref on that server: `/j` serves it
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/// too, so viewers without access get it ready.
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bool get relayNextAvailable => _onLogin(nextJellyfinRef);
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/// Up next's first item's Jellyfin ref (null: none, or not a ref).
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JellyfinRef? get nextJellyfinRef => engine.queue.items.firstOrNull?.media.jellyfin;
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bool _onLogin(JellyfinRef? ref) {
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final cred = jellyfin;
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return ref != null && cred != null && cred.serverId.isNotEmpty && cred.serverId == ref.serverId;
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}
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/// What the swapper reads when the server cannot fetch a link ([why]
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/// from the relay). A yt-dlp failure on a server without cookies says
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/// so, unless cookies would not help (unknown site, gone, unreachable).
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String fetchFailText(String why) {
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const head = "The server can't fetch this link";
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final y = ytDlp;
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final plain = playErrorText(why);
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final cookiesMightHelp = y != null &&
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y.enabled &&
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why.contains('yt-dlp') &&
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!const {unsupportedUrlText, notFoundText, unreachableText}.contains(plain) &&
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y.cookies.read(count: false) == null;
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return cookiesMightHelp
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? '$head: it has no cookies (set them in Settings → Player → yt-dlp on the hosting app, or --yt-dlp-cookies)'
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: '$head: $why';
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}
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StateBroadcast stateBroadcast() => engine.broadcast(
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relay: relayAvailable, relayNext: relayNextAvailable, warm: _warmView(), sourceGone: _sourceGone);
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/// The relay of the current media (`/r/...`), if it is relayed.
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ActiveRelay? relay;
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/// Replaces the relay (null: the new media is not relayed). The old
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/// buffer is dropped with it.
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void setRelay(ActiveRelay? next) {
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if (!identical(relay, next)) {
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final old = relay;
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if (old != null) _hubLog.info('relay of "${old.name}" dropped (sent ${_sent(old)})');
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old?.dispose();
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}
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relay = next;
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}
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static String _sent(ActiveRelay r) =>
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'${(r.buffers.fold<int>(0, (a, b) => a + b.bytesFromFeed) / 1048576).toStringAsFixed(1)} MiB in';
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/// The warm relay: Up next's first item relayed before it goes up, so
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/// every viewer preloads it (see ARCHITECTURE "Getting ready"); null
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/// when that item is not relayed (or nobody would read it).
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ActiveRelay? warm;
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void _setWarm(ActiveRelay? next) {
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if (!identical(warm, next)) {
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final old = warm;
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if (old != null) _hubLog.info('warm relay of Up next ${old.queueId} ("${old.name}") dropped (${_sent(old)})');
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old?.dispose();
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if (next != null) {
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_hubLog.info('warm relay of Up next ${next.queueId} ("${next.name}"): '
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'${next.fetch ? 'the server fetches it' : next.sourceId.isEmpty ? 'from the first member with an account' : 'from ${next.sourceId}'}');
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}
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}
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warm = next;
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}
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/// Drops both relays (server stop).
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void dropRelays() {
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setRelay(null);
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_setWarm(null);
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}
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/// `queue[0].media.relay` while the warm relay exists.
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({String id, MediaRelay relay})? _warmView() {
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final w = warm, id = w?.queueId;
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if (w == null || id == null) return null;
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final src = w.sourceToken == null ? null : engine.members[w.sourceToken];
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final gone = src?.presence == Presence.gone;
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return (
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id: id,
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relay: MediaRelay(
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source: w.fetch ? '' : w.sourceId,
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fetch: w.fetch,
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live: w.live,
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tracks: w.live ? w.tracks : const [],
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sourceGone: gone,
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sourceGoneSince: gone ? src?.goneSince : null),
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);
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}
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/// Keeps [warm] on Up next's first item when it is relayed: a link the
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/// server fetches (its fetch starts now), a link passed on or a file
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/// (its adder's app feeds it, while someone else is here to read it;
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/// not the host's own file), a
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/// Jellyfin item that someone here cannot play and the server's login
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/// does not cover (the first member with an account feeds it). Called
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/// on every change; anything else drops it.
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void syncWarm() {
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final first = engine.queue.items.firstOrNull;
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final w = warm;
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if (w != null && (first == null || w.queueId != first.id || !_keepWarm(w, first))) _setWarm(null);
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if (warm == null && first != null) _setWarm(_newWarm(first));
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}
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bool _othersHere(String? memberId) =>
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engine.members.values.any((m) => m.id != memberId && m.presence != Presence.gone);
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/// A Jellyfin [ref] someone here cannot play while someone can, outside
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/// the server's login.
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bool _jellyfinNeedsWarm(JellyfinRef ref) =>
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!_onLogin(ref) &&
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engine.members.values
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.any((m) => engine.policy.countsFor(m.presence, Purpose.preload) && m.jf[ref.serverId] != true) &&
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engine.members.values.any((m) => m.jf[ref.serverId] == true);
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bool _keepWarm(ActiveRelay w, QueueItem first) {
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switch (first.how) {
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case QueueHow.server:
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return w.fetch;
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case QueueHow.through:
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case QueueHow.file:
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final adder = engine.byId(first.by);
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return adder != null && adder.token == w.sourceToken && _othersHere(adder.id);
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case QueueHow.jellyfin:
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final ref = first.media.jellyfin;
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final src = w.sourceToken;
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return ref != null && _jellyfinNeedsWarm(ref) && (src == null || engine.members.containsKey(src));
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case QueueHow.direct:
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return false;
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}
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}
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ActiveRelay? _newWarm(QueueItem first) {
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final id = first.id;
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final name = sanitizeMediaName(first.media.name.isEmpty ? first.title : first.media.name);
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late final ActiveRelay r;
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switch (first.how) {
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case QueueHow.server:
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final url = Uri.tryParse(engine.queue.privateUrlOf(id) ?? '');
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if (url == null || session.secret.isEmpty) return null;
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r = ActiveRelay.fetchLink(-1, name, url, ytDlp: ytDlp, queueId: id, onLiveChanged: () => relayLiveChanged(r));
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case QueueHow.through:
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case QueueHow.file:
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final adder = engine.byId(first.by);
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// The host's own file plays from its `/m` URL, never relayed.
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if (adder == null || !_othersHere(adder.id) || (adder.host && first.how == QueueHow.file)) return null;
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r = ActiveRelay.warmFromMember(id, name, adder.token,
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sourceId: adder.id, onLiveChanged: () => relayLiveChanged(r));
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case QueueHow.jellyfin:
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final ref = first.media.jellyfin;
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if (ref == null || !_jellyfinNeedsWarm(ref)) return null;
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r = ActiveRelay.warmFromMember(id, name, null, onLiveChanged: () => relayLiveChanged(r));
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case QueueHow.direct:
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return null;
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}
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return r;
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}
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/// The relay `/r/.../<key>/...` reads: the current one by its media id,
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/// or by the queue id it was started for, or the warm one.
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ActiveRelay? relayAt(String key) {
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final r = relay, w = warm;
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final mediaId = int.tryParse(key);
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if (mediaId != null) return r != null && r.mediaId == mediaId ? r : null;
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if (key.isEmpty) return null;
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if (w != null && w.queueId == key) return w;
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if (r != null && r.queueId == key) return r;
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return null;
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}
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/// The relay member [token] may feed on its channel: the current one
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/// ([queueId] null), or the one of Up next item [queueId] (warm or
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/// already promoted). A warm Jellyfin item takes the first member with
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/// an account on that server that dials in.
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ActiveRelay? sourceOf(String token, String? queueId) {
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if (queueId == null || queueId.isEmpty) {
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final r = relay;
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return r != null && r.sourceToken == token ? r : null;
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}
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final r = relayAt(queueId);
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if (r == null || r.fetch) return null;
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if (r.sourceToken == null && identical(r, warm)) {
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final ref = engine.queue.item(queueId)?.media.jellyfin;
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final m = engine.members[token];
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if (ref == null || m == null || m.jf[ref.serverId] != true) return null;
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r
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..sourceToken = token
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..sourceId = m.id;
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broadcastState();
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}
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return r.sourceToken == token ? r : null;
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}
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/// A swap of Up next item [queueId] by [token]: its warm relay, when it
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/// can become the media's (the same kind of relay; a member's from its
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/// own source with the same tracks), else null. Taken either way: the
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/// item goes up now.
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ActiveRelay? takeWarm(String? queueId, String token, {required bool fetch, List<RelayTrackSpec> tracks = const []}) {
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final w = warm;
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if (queueId == null || w == null || w.queueId != queueId) return null;
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warm = null;
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final ok = fetch
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? w.fetch && !w.failed
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: !w.fetch && w.sourceToken == token && (!w.known || _sameTracks(w.tracks, tracks));
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if (ok) {
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_hubLog.info('warm relay of Up next $queueId promoted (${_sent(w)}, live ${w.live})');
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w.ensureTracks(tracks);
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return w;
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}
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_hubLog.info('warm relay of Up next $queueId not promoted (${w.failed ? 'its fetch failed' : 'another kind or source'})');
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w.dispose();
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return null;
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}
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static bool _sameTracks(List<RelayTrackSpec> a, List<RelayTrackSpec> b) =>
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a.length == b.length && [for (var i = 0; i < a.length; i++) a[i] == b[i]].every((x) => x);
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/// `media.relay` for a relayed swap by [token]: who serves the bytes
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/// and, from a member, its tracks (the server finds a fetched link's).
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MediaRelay relayFor(String token, MediaRelay requested) => requested.fetch
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? const MediaRelay(fetch: true)
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: MediaRelay(source: engine.members[token]?.id ?? '', tracks: requested.tracks);
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/// `media.relay` of a promoted warm relay [w] (Up next item [queueId]).
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MediaRelay promotedRelay(ActiveRelay w, String queueId) => w.fetch
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? MediaRelay(fetch: true, live: w.live, tracks: w.live ? w.tracks : const [], queueId: queueId)
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: MediaRelay(source: w.sourceId, live: w.live, tracks: w.tracks, queueId: queueId);
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/// The relay's channel came up or went down, or a fetched link was read:
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/// `media.relay.live` and `tracks` follow (the warm one's in `queue`).
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void relayLiveChanged(ActiveRelay r) {
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if (identical(warm, r)) {
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broadcastState();
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return;
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}
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final m = engine.media;
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if (!identical(relay, r) || m?.relay == null) return;
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final was = m!.relay!;
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if (was.live == r.live && was.tracks.join(',') == r.tracks.join(',')) return;
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if (was.live != r.live) _hubLog.info('relay of "${r.name}" ${r.live ? 'live' : 'not live (source away)'}');
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engine.media = m.copyWith(relay: was.copyWith(live: r.live, tracks: r.tracks));
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changed();
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}
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final _readRates = ReadRates();
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var _statTicks = 0;
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static String _kbs(int bytesPerSec) => '${(bytesPerSec / 1024).round()} KiB/s';
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/// Once a second: each member's read rate (`members[].rate`) and the
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/// relay's source rate and bitrate (`media.relay.rate` / `need`). Goes
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/// out with the next state.
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void sampleRates() {
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final tokens = session.tokens;
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final rates = _readRates.sample(engine.now, {
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for (final t in engine.members.keys) t: tokens[t]?.bytesServed ?? 0,
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});
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for (final m in engine.members.values) {
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m.rate = rates[m.token] ?? 0;
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}
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final r = relay, m = engine.media;
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final was = m?.relay;
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if (r == null || m == null || was == null || r.mediaId != engine.mediaId) return;
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r.sampleRate();
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final rate = r.rate, need = r.need(m.duration);
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if (++_statTicks % 30 == 0 && r.live) {
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final readers = engine.members.values.where((x) => x.rate > 0).map((x) => '${x.name} ${_kbs(x.rate)}');
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_hubLog.info('relay stats "${r.name}": source ${_kbs(rate)}, needs ${_kbs(need)}, '
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'buffered ${(r.cachedBytes / 1048576).toStringAsFixed(1)} MiB, ${_sent(r)}'
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'${readers.isEmpty ? '' : '; reading: ${readers.join(', ')}'}');
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}
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if (rate != was.rate || need != was.need) {
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engine.media = m.copyWith(relay: was.copyWith(rate: rate, need: need));
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}
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}
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bool isHostKey(String key) => hostKey.isNotEmpty && key == hostKey;
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/// A member for the log: `name (id)`, never its token or client id.
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String who(String token) {
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final m = engine.members[token];
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if (m != null) return '${m.name} (${m.id})';
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final v = session.tokens[token];
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return v != null ? '${v.name} (no member)' : 'unknown member';
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}
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Session get session => sessions.getOrCreate('default', expectedSecret);
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void broadcastState() {
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final raw = jsonEncode(stateBroadcast().toJson());
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for (final ws in sockets.values.toList()) {
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ws.trySendText(raw);
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}
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}
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/// Once a second: closed sockets, then the engine's sweep (silence,
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/// joining, gone notices, grace), relay source, warm relay, rates, and
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/// a state for everyone.
|
|
void heartbeat() {
|
|
sweepClosedSockets();
|
|
engine.tick();
|
|
refreshRelaySource();
|
|
syncWarm();
|
|
sampleRates();
|
|
broadcastState();
|
|
broadcastFeed();
|
|
}
|
|
|
|
void broadcastFeed() {
|
|
for (final feed in engine.feed.drain()) {
|
|
final raw = jsonEncode(feed.toJson());
|
|
for (final ws in sockets.values.toList()) {
|
|
ws.trySendText(raw);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Relic's server-side `onDone` does not fire for every dead peer:
|
|
/// sockets are polled with `isClosed` too.
|
|
void sweepClosedSockets() {
|
|
for (final entry in sockets.entries.toList()) {
|
|
var closed = false;
|
|
try {
|
|
closed = entry.value.isClosed;
|
|
} catch (_) {
|
|
closed = true;
|
|
}
|
|
if (closed) socketClosed(entry.key, entry.value);
|
|
}
|
|
}
|
|
|
|
Future<void> closeAllSockets() async {
|
|
final all = sockets.values.toList();
|
|
sockets.clear();
|
|
for (final ws in all) {
|
|
try {
|
|
await ws.tryClose();
|
|
} catch (_) {}
|
|
}
|
|
}
|
|
|
|
void broadcastChat(String from, String text, {String fromId = ''}) {
|
|
final clean = text.length > RelayConstants.maxChatLength
|
|
? text.substring(0, RelayConstants.maxChatLength)
|
|
: text;
|
|
final raw = jsonEncode(
|
|
ChatMessage(text: clean).toJson()..addAll({'from': from, if (fromId.isNotEmpty) 'fromId': fromId}));
|
|
for (final ws in sockets.values.toList()) {
|
|
ws.trySendText(raw);
|
|
}
|
|
engine.feed.add(FeedMessage(actor: from, actorId: fromId, action: 'chat', at: engine.now));
|
|
broadcastFeed();
|
|
}
|
|
|
|
/// The server's own fetch of [name] failed: everyone hears it (the
|
|
/// swapper also gets the reason as an error), not just "getting it…".
|
|
void fetchFailed(String name) {
|
|
engine.feed.add(FeedMessage(actor: 'server', actorId: 'server', action: 'fetch-fail', target: name, at: engine.now));
|
|
broadcastFeed();
|
|
}
|
|
|
|
void changed() {
|
|
syncWarm();
|
|
broadcastState();
|
|
broadcastFeed();
|
|
}
|
|
|
|
/// [ws], [token]'s socket, closed: the member is `gone` (kept for the
|
|
/// grace). A socket that is no longer the member's (taken over) changes
|
|
/// nothing.
|
|
void socketClosed(String token, RelicWebSocket ws) {
|
|
if (!identical(sockets[token], ws)) return;
|
|
sockets.remove(token);
|
|
engine.applyGone(token);
|
|
changed();
|
|
}
|
|
|
|
/// The hosting app stopped sharing: every member but the host leaves
|
|
/// now (feed `leave`, reason `closed`), its socket closed with
|
|
/// [CloseCodes.closed] so its app does not reconnect. Returns how many
|
|
/// left.
|
|
int closeGuests() {
|
|
final guests = [
|
|
for (final m in engine.members.values)
|
|
if (!m.host) m.token,
|
|
];
|
|
for (final token in guests) {
|
|
final ws = sockets.remove(token);
|
|
if (ws != null) unawaited(closeWith(ws, CloseCodes.closed, 'the server stopped sharing'));
|
|
engine.applyLeave(token, reason: 'closed');
|
|
}
|
|
if (guests.isNotEmpty) changed();
|
|
return guests.length;
|
|
}
|
|
|
|
/// `bye`: [token]'s member leaves now.
|
|
void bye(String token) {
|
|
engine.applyLeave(token, reason: 'bye');
|
|
changed();
|
|
}
|
|
|
|
/// Passes a nudge from [fromToken] to the member [targetId] only;
|
|
/// over the sender's rate cap, to itself or to nobody it is dropped.
|
|
void nudge(String fromToken, String targetId) {
|
|
final from = engine.members[fromToken];
|
|
final target = engine.byId(targetId);
|
|
final viewer = session.tokens[fromToken];
|
|
if (from == null || target == null || viewer == null || identical(from, target)) return;
|
|
if (!viewer.takeNudge(engine.now)) return;
|
|
sockets[target.token]?.trySendText(jsonEncode(NudgeNotice(from: from.id, name: from.name).toJson()));
|
|
}
|
|
}
|
|
|
|
/// How a swap's media plays, for the log (a link's query cut to names).
|
|
String _swapKind(HelloMedia m) {
|
|
final relay = m.relay;
|
|
final url = (m.url ?? '').isEmpty ? '' : ' ${logUrl(m.url)}';
|
|
if (m.jellyfin != null) return 'Jellyfin item ${m.jellyfin!.itemId}${relay == null ? '' : ', relayed from the swapper'}';
|
|
if (relay == null) return url.isEmpty ? 'hosted file' : 'link, everyone fetches it:$url';
|
|
if (relay.fetch) return 'link, the server fetches it:$url';
|
|
final tracks = relay.tracks.isEmpty ? 'one file' : relay.tracks.map((t) => t.toJson().values.join('/')).join(' + ');
|
|
return 'through the swapper ($tracks, ${m.size} bytes)';
|
|
}
|
|
|
|
/// `GET /a/<sid>/<token>/<hash>`: a current member's picture by its
|
|
/// content hash, for members (valid token) only. The bytes for a
|
|
/// hash never change, so clients may cache them for good.
|
|
void mountAvatarRoute(RelicApp app, ServerHub hub) =>
|
|
_mountPictureRoute(app, hub, 'a', hub.engine.avatarFor);
|
|
|
|
/// `GET /i/<sid>/<token>/<hash>`: the current media's art (`art`) by hash,
|
|
/// same rules as [mountAvatarRoute].
|
|
void mountArtRoute(RelicApp app, ServerHub hub) =>
|
|
_mountPictureRoute(app, hub, 'i', hub.engine.artFor);
|
|
|
|
void _mountPictureRoute(RelicApp app, ServerHub hub, String prefix, Uint8List? Function(String hash) lookup) {
|
|
Response status(int code) => Response(code, body: Body.fromString('status $code'));
|
|
app.get('/$prefix/:sid/:token/:hash', (final req) {
|
|
final sid = req.pathParameters.raw[#sid] ?? '';
|
|
final token = req.pathParameters.raw[#token] ?? '';
|
|
final hash = req.pathParameters.raw[#hash] ?? '';
|
|
final session = hub.sessions.get(sid);
|
|
if (session == null) return status(410);
|
|
switch (session.gate(token)) {
|
|
case MediaGate.unauthorized:
|
|
return status(401);
|
|
default:
|
|
break;
|
|
}
|
|
final bytes = lookup(hash);
|
|
final type = bytes == null ? null : avatarImageType(bytes);
|
|
if (bytes == null || type == null) return status(404);
|
|
return Response.ok(
|
|
body: Body.fromData(bytes, mimeType: MimeType(type.$1, type.$2)),
|
|
headers: Headers.build((h) {
|
|
h['cache-control'] = ['private, max-age=31536000, immutable'];
|
|
}),
|
|
);
|
|
});
|
|
}
|
|
|
|
/// Media names are shown to everyone and must never carry a URL (api_key etc.).
|
|
/// A URL-looking name is reduced to its last path segment, no query/fragment.
|
|
String sanitizeMediaName(String name) {
|
|
final trimmed = name.trim();
|
|
if (!RegExp(r'^[a-zA-Z][a-zA-Z0-9+.-]*://').hasMatch(trimmed)) return name;
|
|
final uri = Uri.tryParse(trimmed);
|
|
final segments = uri?.pathSegments.where((s) => s.isNotEmpty).toList() ?? const [];
|
|
if (segments.isNotEmpty) return segments.last;
|
|
return 'media';
|
|
}
|
|
|
|
/// Sends `err` [code] with [message] (plain text for people) and, when a
|
|
/// frame failed, its type as `for`. The socket stays open.
|
|
void wsErr(RelicWebSocket ws, ErrCode code, String message, {String? forType}) {
|
|
ws.trySendText(jsonEncode(ErrorFrame(code: code, message: message, forType: forType).toJson()));
|
|
}
|
|
|
|
/// Closes [ws] with [code] (see [CloseCodes]); a socket that is already
|
|
/// gone is fine.
|
|
Future<void> closeWith(RelicWebSocket ws, int code, String reason) async {
|
|
try {
|
|
await ws.close(code, reason);
|
|
} catch (_) {
|
|
await ws.tryClose();
|
|
}
|
|
}
|
|
|
|
/// Jellyfin ids are path segments of upstream requests: keep them plain.
|
|
final _jellyfinId = RegExp(r'^[A-Za-z0-9-]{1,64}$');
|
|
|
|
/// The swap's Jellyfin ref cleaned for broadcast (names like
|
|
/// [sanitizeMediaName]), or null when its ids are unusable.
|
|
JellyfinRef? sanitizeJellyfinRef(JellyfinRef ref) {
|
|
if (!_jellyfinId.hasMatch(ref.serverId) || !_jellyfinId.hasMatch(ref.itemId)) return null;
|
|
final source = ref.mediaSourceId;
|
|
if (source != null && !_jellyfinId.hasMatch(source)) return null;
|
|
final runtime = ref.runtimeSecs;
|
|
return JellyfinRef(
|
|
serverId: ref.serverId,
|
|
itemId: ref.itemId,
|
|
mediaSourceId: source,
|
|
title: sanitizeMediaName(ref.title),
|
|
subtitle: ref.subtitle == null ? null : sanitizeMediaName(ref.subtitle!),
|
|
runtimeSecs: runtime == null || runtime < 0 ? null : runtime,
|
|
);
|
|
}
|
|
|
|
/// [relayUrlBuilder] builds a member's `/j/...` URL for `welcome.relayUrl`.
|
|
void mountSyncRoute(
|
|
RelicApp app,
|
|
ServerHub hub,
|
|
String Function(String sid, String token, SessionMedia? media, String host)
|
|
urlBuilder, {
|
|
String Function(String sid, String token, String itemId, String host)? relayUrlBuilder,
|
|
/// `key`: the media id, or the queue id of a relay started in Up next.
|
|
String Function(String sid, String token, String key, String name, List<RelayTrackSpec> tracks, String host)?
|
|
relayMediaUrlBuilder,
|
|
}) {
|
|
app.get('/sync', (final req) {
|
|
// Host the client dialled (Host header), so file URLs work for remote joiners.
|
|
final dialledHost = req.url.hasPort
|
|
? '${req.url.host.contains(':') ? '[${req.url.host}]' : req.url.host}:${req.url.port}'
|
|
: (req.url.host.contains(':') ? '[${req.url.host}]' : req.url.host);
|
|
return WebSocketUpgrade((final ws) async {
|
|
ws.pingInterval = hub.engine.liveness.pingInterval;
|
|
final firstText = Completer<String>();
|
|
String? token;
|
|
var welcomed = false;
|
|
late StreamSubscription<WebSocketEvent> sub;
|
|
Future<void> close() async {
|
|
try {
|
|
await sub.cancel();
|
|
} catch (_) {}
|
|
await ws.tryClose();
|
|
}
|
|
|
|
void handleIntent(String text) {
|
|
// A socket another hello took over says nothing for the member.
|
|
if (token != null && !identical(hub.sockets[token], ws)) return;
|
|
final session = hub.session;
|
|
final viewer = token == null ? null : session.tokens[token];
|
|
viewer?.touch(hub.engine.now);
|
|
if (token != null) hub.engine.touch(token);
|
|
Map<String, Object?> decoded;
|
|
try {
|
|
final parsed = jsonDecode(text);
|
|
if (parsed is! Map) return;
|
|
decoded = Map<String, Object?>.from(parsed);
|
|
} catch (_) {
|
|
return;
|
|
}
|
|
final type = decoded['t'];
|
|
try {
|
|
switch (type) {
|
|
case 'ready':
|
|
if (token == null) return;
|
|
final intent = ReadyIntent.fromJson(decoded);
|
|
hub.engine.applyReady(token, intent.ready, source: intent.source);
|
|
hub.changed();
|
|
case 'force':
|
|
if (token == null) return;
|
|
final intent = ForceIntent.fromJson(decoded);
|
|
hub.engine.applyForce(token, intent.target, intent.ready);
|
|
hub.changed();
|
|
case 'seek':
|
|
if (token == null) return;
|
|
final intent = SeekIntent.fromJson(decoded);
|
|
hub.engine.applySeek(token, intent.position, seq: intent.seq);
|
|
hub.changed();
|
|
case 'swap':
|
|
if (token == null) return;
|
|
final swap = SwapIntent.fromJson(decoded);
|
|
var parsed = swap.media;
|
|
final queueId = swap.queueId;
|
|
_hubLog.info('swap by ${hub.who(token)}: "${parsed.name}" ${_swapKind(parsed)}'
|
|
'${queueId == null ? '' : ' (Up next $queueId)'}');
|
|
if (queueId != null) {
|
|
// Already put up by someone else: nothing to do.
|
|
if (!hub.engine.queue.has(queueId)) return;
|
|
// A server-fetched item's link never left the server.
|
|
final hidden = hub.engine.queue.privateUrlOf(queueId);
|
|
if (hidden != null && (parsed.url ?? '').isEmpty) {
|
|
parsed = HelloMedia(
|
|
name: parsed.name,
|
|
size: parsed.size,
|
|
duration: parsed.duration,
|
|
url: hidden,
|
|
relay: parsed.relay,
|
|
ref: parsed.ref);
|
|
}
|
|
}
|
|
if (parsed.jellyfin != null) {
|
|
// By reference only: no URL (it could carry a token) is
|
|
// stored or broadcast for Jellyfin media.
|
|
final ref = sanitizeJellyfinRef(parsed.jellyfin!);
|
|
// Relayed for viewers without access: from the swapper's
|
|
// machine (its own sign-in never leaves it).
|
|
final relayReq = parsed.relay == null || parsed.relay!.fetch ? null : parsed.relay;
|
|
// Up next's warm relay of this item carries on as its relay.
|
|
final promoted = relayReq == null || ref == null ? null : hub.takeWarm(queueId, token, fetch: false);
|
|
final media = ref == null
|
|
? null
|
|
: HelloMedia(
|
|
name: promoted?.name ?? sanitizeMediaName(parsed.name.isEmpty ? ref.title : parsed.name),
|
|
size: parsed.size,
|
|
duration: parsed.duration,
|
|
jellyfin: ref,
|
|
ref: parsed.ref,
|
|
relay: relayReq == null
|
|
? null
|
|
: promoted != null
|
|
? hub.promotedRelay(promoted, queueId!)
|
|
: hub.relayFor(token, const MediaRelay()));
|
|
if (media == null || !hub.engine.applySwap(token, media, queueId: queueId)) {
|
|
promoted?.dispose();
|
|
wsErr(ws, ErrCode.bad, 'bad swap media', forType: 'swap');
|
|
return;
|
|
}
|
|
session.media = SessionMedia(
|
|
name: media.name,
|
|
size: media.size,
|
|
duration: media.duration,
|
|
jellyfin: ref,
|
|
mediaId: hub.engine.mediaId);
|
|
hub.setRelay(relayReq == null
|
|
? null
|
|
: promoted != null
|
|
? (promoted..promote(hub.engine.mediaId))
|
|
: _memberRelay(hub, token, media.name, const []));
|
|
hub.changed();
|
|
return;
|
|
}
|
|
final relayReq = parsed.relay;
|
|
if (relayReq != null) {
|
|
// Relayed file or link: no URL is stored or broadcast (a
|
|
// link may be private to the swapper; the server keeps a
|
|
// fetched one to itself).
|
|
final name = sanitizeMediaName(parsed.name.isEmpty ? 'media' : parsed.name);
|
|
final link = Uri.tryParse(parsed.url ?? '');
|
|
if (relayReq.fetch &&
|
|
(link == null || !(link.isScheme('http') || link.isScheme('https')) || link.host.isEmpty)) {
|
|
wsErr(ws, ErrCode.bad, 'relay fetch needs an http(s) url', forType: 'swap');
|
|
return;
|
|
}
|
|
// The server would fetch any address it can reach (its own
|
|
// network, a VPN) for whoever asks: only for members who
|
|
// know the password.
|
|
if (relayReq.fetch && session.secret.isEmpty) {
|
|
wsErr(ws, ErrCode.rejected, 'server fetch needs a server password', forType: 'swap');
|
|
return;
|
|
}
|
|
// Up next's warm relay of this item carries on as its relay
|
|
// (its buffer, its feed, its `/r/.../<queueId>/` URLs).
|
|
final promoted = hub.takeWarm(queueId, token, fetch: relayReq.fetch, tracks: relayReq.tracks);
|
|
final shown = promoted?.name ?? name;
|
|
final media = HelloMedia(
|
|
name: shown,
|
|
size: parsed.size,
|
|
duration: parsed.duration,
|
|
ref: parsed.ref,
|
|
relay: promoted != null ? hub.promotedRelay(promoted, queueId!) : hub.relayFor(token, relayReq));
|
|
if (!hub.engine.applySwap(token, media, queueId: queueId)) {
|
|
promoted?.dispose();
|
|
wsErr(ws, ErrCode.bad, 'bad swap media', forType: 'swap');
|
|
return;
|
|
}
|
|
session.media = SessionMedia(
|
|
name: shown, size: parsed.size, duration: parsed.duration, mediaId: hub.engine.mediaId);
|
|
void failed(String why) {
|
|
wsErr(ws, ErrCode.rejected, hub.fetchFailText(why), forType: 'swap');
|
|
hub.fetchFailed(shown);
|
|
}
|
|
late final ActiveRelay active;
|
|
if (promoted != null) {
|
|
active = promoted..promote(hub.engine.mediaId);
|
|
if (active.fetch) {
|
|
active.onFail = failed;
|
|
}
|
|
} else {
|
|
active = relayReq.fetch
|
|
? ActiveRelay.fetchLink(hub.engine.mediaId, name, link!,
|
|
ytDlp: hub.ytDlp, onLiveChanged: () => hub.relayLiveChanged(active), onFail: failed)
|
|
: _memberRelay(hub, token, name, media.relay!.tracks);
|
|
}
|
|
hub.setRelay(active);
|
|
hub.changed();
|
|
return;
|
|
}
|
|
final intent = SwapIntent(
|
|
media: HelloMedia(
|
|
name: sanitizeMediaName(parsed.name),
|
|
size: parsed.size,
|
|
duration: parsed.duration,
|
|
url: parsed.url,
|
|
ref: parsed.ref));
|
|
final current = session.media;
|
|
final matchesFile = current?.file != null &&
|
|
current!.name == intent.media.name &&
|
|
current.size == intent.media.size;
|
|
if (!matchesFile && (intent.media.url ?? '').isEmpty) {
|
|
wsErr(ws, ErrCode.bad, 'swap needs a url or the hosted file', forType: 'swap');
|
|
return;
|
|
}
|
|
if (!hub.engine.applySwap(token, intent.media, queueId: queueId)) {
|
|
wsErr(ws, ErrCode.bad, 'bad swap media', forType: 'swap');
|
|
return;
|
|
}
|
|
hub.setRelay(null);
|
|
if (matchesFile) {
|
|
session.media = SessionMedia(
|
|
name: current.name,
|
|
size: current.size,
|
|
duration: intent.media.duration,
|
|
url: intent.media.url,
|
|
file: current.file,
|
|
mediaId: hub.engine.mediaId);
|
|
} else {
|
|
session.media = SessionMedia(
|
|
name: intent.media.name,
|
|
size: intent.media.size,
|
|
duration: intent.media.duration,
|
|
url: intent.media.url,
|
|
mediaId: hub.engine.mediaId);
|
|
}
|
|
hub.changed();
|
|
case 'profile':
|
|
if (token == null || viewer == null) return;
|
|
final intent = ProfileIntent.fromJson(decoded);
|
|
final avatar = intent.avatar;
|
|
if (avatar != null && avatar.length > RelayConstants.maxAvatarBytes) {
|
|
wsErr(ws, ErrCode.rejected, 'rejected: avatar too large', forType: 'profile');
|
|
return;
|
|
}
|
|
final name = intent.name == null ? null : cleanMemberName(intent.name!);
|
|
// Chat names the sender by its token's name.
|
|
if (name != null) viewer.name = name;
|
|
hub.engine.applyProfile(token, name: name, avatar: avatar);
|
|
hub.changed();
|
|
case 'art':
|
|
if (token == null) return;
|
|
final art = ArtMessage.fromJson(decoded);
|
|
if (hub.engine.applyArt(token, art.mediaId, poster: art.poster, banner: art.banner)) {
|
|
hub.broadcastState();
|
|
}
|
|
case 'report':
|
|
if (token == null) return;
|
|
final report = ReportMessage.fromJson(decoded);
|
|
final before = hub.engine.members[token]?.error ?? '';
|
|
if (report.error != before && report.mediaId == hub.engine.mediaId) {
|
|
_hubLog.warning(report.error.isEmpty
|
|
? '${hub.who(token)}: player error cleared'
|
|
: '${hub.who(token)}: cannot play media ${report.mediaId}: ${report.error}');
|
|
}
|
|
hub.engine.applyReport(
|
|
token, report.position, report.buffered, report.eventId,
|
|
duration: report.duration, mediaId: report.mediaId, jf: report.jf, error: report.error);
|
|
hub.changed();
|
|
case 'ping':
|
|
final ping = PingMessage.fromJson(decoded);
|
|
ws.trySendText(jsonEncode(PongMessage(
|
|
clientMs: ping.clientMs,
|
|
serverMs: hub.engine.now.millisecondsSinceEpoch)
|
|
.toJson()));
|
|
case 'chat':
|
|
final chat = ChatMessage.fromJson(decoded);
|
|
hub.broadcastChat(viewer?.name ?? '?', chat.text, fromId: hub.engine.members[token]?.id ?? '');
|
|
case 'presence':
|
|
if (token == null) return;
|
|
final intent = PresenceIntent.fromJson(decoded);
|
|
final refused = hub.engine.applyPresence(token, intent.target, intent.state, reason: intent.reason);
|
|
if (refused != null) {
|
|
wsErr(ws, refused, 'only a member itself comes back in', forType: 'presence');
|
|
}
|
|
hub.changed();
|
|
case 'bye':
|
|
if (token == null) return;
|
|
_hubLog.info('bye from ${hub.who(token)}');
|
|
hub.bye(token);
|
|
case 'nudge':
|
|
if (token == null) return;
|
|
hub.nudge(token, NudgeIntent.fromJson(decoded).target);
|
|
case 'queue':
|
|
if (token == null) return;
|
|
handleQueueIntent(hub, token, ws, decoded);
|
|
}
|
|
} on ProtocolException catch (e) {
|
|
_hubLog.info('${token == null ? 'a socket' : hub.who(token)}: bad $type message: ${e.message}');
|
|
wsErr(ws, ErrCode.bad, 'bad message: ${e.message}', forType: type is String ? type : null);
|
|
} catch (e, st) {
|
|
_hubLog.warning('${token == null ? 'a socket' : hub.who(token)}: $type message failed: $e', e, st);
|
|
return;
|
|
}
|
|
}
|
|
|
|
sub = ws.events.listen(
|
|
(event) {
|
|
if (event is! TextDataReceived) return;
|
|
if (!firstText.isCompleted) {
|
|
firstText.complete(event.text);
|
|
} else if (welcomed) {
|
|
handleIntent(event.text);
|
|
}
|
|
},
|
|
onError: (_) {
|
|
if (token != null) hub.socketClosed(token, ws);
|
|
},
|
|
onDone: () {
|
|
if (!firstText.isCompleted) {
|
|
firstText.completeError(StateError('closed before hello'));
|
|
} else if (token != null) {
|
|
hub.socketClosed(token, ws);
|
|
}
|
|
},
|
|
);
|
|
String raw;
|
|
try {
|
|
raw = await firstText.future.timeout(const Duration(seconds: 10));
|
|
} catch (_) {
|
|
await close();
|
|
return;
|
|
}
|
|
Future<void> refuse(ErrorFrame err, int code, String log) async {
|
|
_hubLog.warning('reject: $log');
|
|
ws.trySendText(jsonEncode(err.toJson()));
|
|
try {
|
|
await sub.cancel();
|
|
} catch (_) {}
|
|
await closeWith(ws, code, err.code?.name ?? 'refused');
|
|
}
|
|
|
|
// The version first, read leniently: another version's hello may
|
|
// not parse as ours.
|
|
final Map<String, Object?> raw0;
|
|
try {
|
|
final decoded = jsonDecode(raw);
|
|
if (decoded is! Map) throw const ProtocolException('hello must be an object');
|
|
raw0 = Map<String, Object?>.from(decoded);
|
|
} catch (e) {
|
|
await refuse(ErrorFrame(code: ErrCode.bad, message: 'bad hello: $e', forType: 'hello'), CloseCodes.refused,
|
|
'bad hello: $e');
|
|
return;
|
|
}
|
|
final range = HelloMessage.protoRangeOf(raw0);
|
|
final proto = range == null ? null : pickProto(range.min, range.max);
|
|
if (proto == null) {
|
|
final got = range?.max ?? 0;
|
|
await refuse(ErrorFrame.version(got: got, server: appVersion), CloseCodes.version,
|
|
'proto mismatch: got ${range == null ? 'none' : '${range.min}..${range.max}'}, '
|
|
'want ${RelayConstants.protoMin}..${RelayConstants.protoMax}');
|
|
return;
|
|
}
|
|
HelloMessage hello;
|
|
try {
|
|
hello = HelloMessage.fromJson(raw0);
|
|
} catch (e) {
|
|
await refuse(ErrorFrame(code: ErrCode.bad, message: 'bad hello: $e', forType: 'hello'), CloseCodes.refused,
|
|
'bad hello: $e');
|
|
return;
|
|
}
|
|
final session = hub.session;
|
|
// The hosting app's own client (its host key) needs no password: the
|
|
// password may change while it is connected ([SyncServer.share]).
|
|
if (session.secret.isNotEmpty && hello.secret != session.secret && !hub.isHostKey(hello.hostKey)) {
|
|
await refuse(const ErrorFrame(code: ErrCode.secret, message: 'wrong secret', forType: 'hello'),
|
|
CloseCodes.secret, '${cleanMemberName(hello.user.name)}: wrong secret');
|
|
return;
|
|
}
|
|
if (hello.user.avatar.length > RelayConstants.maxAvatarBytes) {
|
|
await refuse(
|
|
const ErrorFrame(code: ErrCode.rejected, message: 'rejected: avatar too large', forType: 'hello'),
|
|
CloseCodes.refused,
|
|
'${cleanMemberName(hello.user.name)}: avatar too large');
|
|
return;
|
|
}
|
|
final known = hub.engine.byClient(hello.client);
|
|
if (known != null && hello.seq < known.seq) {
|
|
await refuse(
|
|
const ErrorFrame(
|
|
code: ErrCode.stale, message: 'an older connection of this app (a newer one holds it)', forType: 'hello'),
|
|
CloseCodes.stale,
|
|
'${known.name} (${known.id}): an older hello than the member\'s');
|
|
return;
|
|
}
|
|
final String memberId;
|
|
final bool resumed;
|
|
final about = '${hello.app.isEmpty ? 'no version' : hello.app}${hello.platform.isEmpty ? '' : ' on ${hello.platform}'}';
|
|
if (known != null) {
|
|
// This app again (a reconnect, or opened anew): it takes its
|
|
// member over, same token and id; an older socket still open is
|
|
// told and closed.
|
|
token = known.token;
|
|
memberId = known.id;
|
|
resumed = true;
|
|
final old = hub.sockets[known.token];
|
|
hub.sockets[known.token] = ws;
|
|
if (old != null && !identical(old, ws)) {
|
|
old.trySendText(jsonEncode(const ErrorFrame(
|
|
code: ErrCode.replaced, message: 'this member was opened from another connection of the same app')
|
|
.toJson()));
|
|
unawaited(closeWith(old, CloseCodes.replaced, 'replaced'));
|
|
}
|
|
final back = hub.engine.applyTakeover(known.token,
|
|
seq: hello.seq, app: hello.app, platform: hello.platform, caps: hello.caps);
|
|
final name = cleanMemberName(hello.user.name);
|
|
session.tokens[known.token]?.name = name;
|
|
hub.engine.applyProfile(known.token, name: name, avatar: hello.user.avatar);
|
|
_hubLog.info('${back ? 'return' : 'takeover'} ${known.name} ($memberId), $about');
|
|
} else {
|
|
try {
|
|
token = session.issueToken(hello.user.name, hello.user.avatar);
|
|
} catch (e) {
|
|
await refuse(ErrorFrame(code: ErrCode.rejected, message: 'rejected: $e', forType: 'hello'),
|
|
CloseCodes.refused, '${cleanMemberName(hello.user.name)}: $e');
|
|
return;
|
|
}
|
|
memberId = hub.engine.applyJoin(token, session.tokens[token]!.name, hello.user.avatar,
|
|
client: hello.client, seq: hello.seq, app: hello.app, platform: hello.platform, caps: hello.caps);
|
|
resumed = false;
|
|
hub.sockets[token] = ws;
|
|
_hubLog.info('join ${session.tokens[token]!.name} ($memberId), $about');
|
|
}
|
|
final activeToken = token;
|
|
final isHost = hub.isHostKey(hello.hostKey);
|
|
session.tokens[activeToken]!.isHost = isHost;
|
|
hub.engine.members[activeToken]?.host = isHost;
|
|
hub.refreshRelaySource();
|
|
final media = session.media;
|
|
final relay = hub.relayAvailable;
|
|
final relayed = hub.relay;
|
|
final feedAfter = hello.feedAfter;
|
|
final welcome = WelcomeMessage(
|
|
token: activeToken,
|
|
memberId: memberId,
|
|
proto: proto,
|
|
resumed: resumed,
|
|
instance: hub.instance,
|
|
grace: hub.engine.liveness.grace.inSeconds,
|
|
feed: feedAfter == null ? const [] : hub.engine.feed.after(feedAfter),
|
|
// Jellyfin media resolves per member (own account first); only
|
|
// relayed files and links start from the /r/ URL, and never for
|
|
// the source itself (it plays its own copy).
|
|
// A fetched link not read yet has no URL: the state's `live` opens it.
|
|
mediaUrl: relayed != null &&
|
|
media != null &&
|
|
media.jellyfin == null &&
|
|
relayed.sourceToken != activeToken &&
|
|
relayed.mediaId == media.mediaId &&
|
|
relayMediaUrlBuilder != null
|
|
? (relayed.known
|
|
? relayMediaUrlBuilder('default', activeToken, relayed.queueId ?? '${relayed.mediaId}', media.name,
|
|
relayed.tracks, dialledHost)
|
|
: null)
|
|
: media?.file != null
|
|
? urlBuilder('default', activeToken, media, dialledHost)
|
|
: media?.url,
|
|
relayUrl: relay && relayUrlBuilder != null
|
|
? relayUrlBuilder('default', activeToken, media!.jellyfin!.itemId, dialledHost)
|
|
: null,
|
|
state: hub.stateBroadcast().toJson(),
|
|
);
|
|
try {
|
|
ws.sendText(jsonEncode(welcome.toJson()));
|
|
} catch (_) {
|
|
await close();
|
|
return;
|
|
}
|
|
welcomed = true;
|
|
hub.changed();
|
|
try {
|
|
await sub.asFuture();
|
|
} catch (_) {}
|
|
});
|
|
});
|
|
}
|
|
|
|
ActiveRelay _memberRelay(ServerHub hub, String token, String name, List<RelayTrackSpec> tracks) {
|
|
late final ActiveRelay r;
|
|
r = ActiveRelay.fromMember(hub.engine.mediaId, name, token,
|
|
tracks: tracks, sourceId: hub.engine.members[token]?.id ?? '', onLiveChanged: () => hub.relayLiveChanged(r));
|
|
return r;
|
|
}
|