TF-3157 Update web socket with background service worker

TF-3157 Stub BroadcastChannel for mobile build

lib/features/push_notification/domain/exceptions/web_socket_exceptions.dart

@@ -2,4 +2,6 @@ class WebSocketPushNotSupportedException implements Exception {}
 
 class WebSocketUriUnavailableException implements Exception {}
 
-class WebSocketTicketUnavailableException implements Exception {}
+class WebSocketTicketUnavailableException implements Exception {}
+
+class WebSocketClosedException implements Exception {}

lib/features/push_notification/domain/model/web_socket_action.dart

@@ -0,0 +1 @@
+enum WebSocketAction {connect, disconnect}

lib/features/push_notification/domain/state/web_socket_push_state.dart

@@ -5,12 +5,12 @@ import 'package:jmap_dart_client/jmap/push/state_change.dart';
 class InitializingWebSocketPushChannel extends LoadingState {}
 
 class WebSocketPushStateReceived extends UIState {
-  final StateChange stateChange;
+  final StateChange? stateChange;
 
   WebSocketPushStateReceived(this.stateChange);
 
   @override
-  List<Object> get props => [stateChange];
+  List<Object?> get props => [stateChange];
 }
 
 class WebSocketConnectionFailed extends FeatureFailure {

lib/features/push_notification/domain/usecases/connect_web_socket_interactor.dart

@@ -7,6 +7,7 @@ import 'package:dartz/dartz.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/session/session.dart';
 import 'package:jmap_dart_client/jmap/push/state_change.dart';
+import 'package:tmail_ui_user/features/push_notification/data/model/web_socket_echo.dart';
 import 'package:tmail_ui_user/features/push_notification/domain/repository/web_socket_repository.dart';
 import 'package:tmail_ui_user/features/push_notification/domain/state/web_socket_push_state.dart';
 
@@ -31,9 +32,21 @@ class ConnectWebSocketInteractor {
   }
 
   Either<Failure, Success> _toStateChange(dynamic data) {
-    if (data is String) {
-      data = jsonDecode(data);
+    StateChange? possibleStateChange;
+    try {
+      if (data is String) {
+        data = jsonDecode(data);
+      }
+      possibleStateChange = StateChange.fromJson(data);
+      return Right(WebSocketPushStateReceived(possibleStateChange));
+    } catch (e) {
+      logError('ConnectWebSocketInteractor::_toStateChange: '
+        'websocket message is not StateChange: $data');
+      final dataIsWebSocketEcho = WebSocketEcho.isValid(data);
+      if (dataIsWebSocketEcho) {
+        return Right(WebSocketPushStateReceived(null));
+      }
+      return Left(WebSocketConnectionFailed(exception: e));
     }
-    return Right(WebSocketPushStateReceived(StateChange.fromJson(data)));
   }
 }