Add Attributes for Participant.

lib/src/events.dart

@@ -115,6 +115,21 @@ class RoomMetadataChangedEvent with RoomEvent {
   String toString() => '${runtimeType}()';
 }
 
+/// Participant's attributes have changed.
+/// Emitted by [Room].
+class ParticipantAttributesChanged with RoomEvent {
+  final Participant participant;
+  final Map<String, String> attributes;
+
+  const ParticipantAttributesChanged({
+    required this.participant,
+    required this.attributes,
+  });
+
+  @override
+  String toString() => '${runtimeType}(participant: ${participant})';
+}
+
 /// Room recording status has changed.
 /// Emitted by [Room].
 class RoomRecordingStatusChanged with RoomEvent {

lib/src/participant/local.dart

@@ -458,14 +458,25 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
   /// Sets and updates the metadata of the local participant.
   /// Note: this requires `CanUpdateOwnMetadata` permission encoded in the token.
   /// @param metadata
-  void setMetadata(String metadata, {Map<String, String>? attributes}) {
+  void setMetadata(String metadata) {
     room.engine.signalClient
         .sendUpdateLocalMetadata(lk_rtc.UpdateParticipantMetadata(
       name: name,
       metadata: metadata,
     ));
   }
 
+  /// Sets and updates the attributes of the local participant.
+  /// @attributes key-value pairs to set
+  void setAttributes(Map<String, String> attributes) {
+    room.engine.signalClient
+        .sendUpdateLocalMetadata(lk_rtc.UpdateParticipantMetadata(
+      name: name,
+      metadata: metadata ?? '',
+      attributes: attributes,
+    ));
+  }
+
   /// Sets and updates the name of the local participant.
   ///  Note: this requires `CanUpdateOwnMetadata` permission encoded in the token.
   ///  @param name

lib/src/participant/participant.dart

@@ -78,6 +78,10 @@ abstract class Participant<T extends TrackPublication>
   ParticipantPermissions _permissions = const ParticipantPermissions();
   ParticipantPermissions get permissions => _permissions;
 
+  /// Attributes associated with the participant
+  Map<String, String> get attributes => _attributes;
+  Map<String, String> _attributes = {};
+
   /// when the participant joined the room
   DateTime get joinedAt {
     final pi = _participantInfo;
@@ -170,6 +174,17 @@ abstract class Participant<T extends TrackPublication>
     }
   }
 
+  void _setAttributes(Map<String, String> attrs) {
+    final changed = !const MapEquality().equals(_attributes, attrs);
+    _attributes = attrs;
+    if (changed) {
+      [events, room.events].emit(ParticipantAttributesChanged(
+        participant: this,
+        attributes: attrs,
+      ));
+    }
+  }
+
   @internal
   void updateConnectionQuality(ConnectionQuality quality) {
     if (_connectionQuality == quality) return;
@@ -196,6 +211,8 @@ abstract class Participant<T extends TrackPublication>
     if (info.metadata.isNotEmpty) {
       _setMetadata(info.metadata);
     }
+
+    _setAttributes(info.attributes);
     _participantInfo = info;
     setPermissions(info.permission.toLKType());