[Protocol v7] Remote unpublish & expose permissions (#101)

* fix

* impl

* oldPermissions

* mods

lib/src/participant/local.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/foundation.dart';
-
 import 'package:flutter_webrtc/flutter_webrtc.dart' as rtc;
 import 'package:meta/meta.dart';
 
@@ -17,6 +16,7 @@ import '../track/local/audio.dart';
 import '../track/local/local.dart';
 import '../track/local/video.dart';
 import '../types/other.dart';
+import '../types/participant_permissions.dart';
 import '../types/video_dimensions.dart';
 import '../utils.dart';
 import 'participant.dart';
@@ -339,4 +339,19 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
   @internal
   Iterable<lk_rtc.TrackPublishedResponse> publishedTracksInfo() =>
       trackPublications.values.map((e) => e.toPBTrackPublishedResponse());
+
+  @internal
+  @override
+  ParticipantPermissions? setPermissions(ParticipantPermissions newValue) {
+    final oldValue = super.setPermissions(newValue);
+    if (oldValue != null) {
+      // notify
+      [events, room.events].emit(ParticipantPermissionsUpdatedEvent(
+        participant: this,
+        permissions: newValue,
+        oldPermissions: oldValue,
+      ));
+    }
+    return oldValue;
+  }
 }

lib/src/participant/participant.dart

@@ -12,6 +12,7 @@ import '../support/disposable.dart';
 import '../track/local/local.dart';
 import '../track/track.dart';
 import '../types/other.dart';
+import '../types/participant_permissions.dart';
 import 'local.dart';
 import 'remote.dart';
 
@@ -59,6 +60,9 @@ abstract class Participant<T extends TrackPublication>
   /// Connection quality between the [Participant] and the server.
   ConnectionQuality _connectionQuality = ConnectionQuality.unknown;
 
+  ParticipantPermissions _permissions = const ParticipantPermissions();
+  ParticipantPermissions get permissions => _permissions;
+
   /// when the participant joined the room
   DateTime get joinedAt {
     final pi = _participantInfo;
@@ -161,6 +165,16 @@ abstract class Participant<T extends TrackPublication>
       _setMetadata(info.metadata);
     }
     _participantInfo = info;
+    setPermissions(info.permission.toLKType());
+  }
+
+  @internal
+  // returns oldValue (if updated)
+  ParticipantPermissions? setPermissions(ParticipantPermissions newValue) {
+    if (_permissions == newValue) return null;
+    final oldValue = _permissions;
+    _permissions = newValue;
+    return oldValue;
   }
 
   /// for internal use