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

* fix

* impl

* oldPermissions

* mods

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