feat: Room forwarded key content

lib/matrix_api_lite.dart

@@ -79,6 +79,7 @@ export 'src/model/auth/authentication_three_pid_creds.dart';
 export 'src/model/auth/authentication_token.dart';
 export 'src/model/auth/authentication_types.dart';
 export 'src/model/auth/authentication_user_identifier.dart';
+export 'src/model/events/forwarded_room_key_content.dart';
 export 'src/model/events/room_encrypted_content.dart';
 export 'src/model/events/room_encryption_content.dart';
 export 'src/model/events/room_key_content.dart';

lib/src/model/events/forwarded_room_key_content.dart

@@ -0,0 +1,31 @@
+import '../basic_event.dart';
+import '../../utils/try_get_map_extension.dart';
+import 'room_key_content.dart';
+
+extension ForwardedRoomKeyContentBasicEventExtension on BasicEvent {
+  ForwardedRoomKeyContent get parsedForwardedRoomKeyContent =>
+      ForwardedRoomKeyContent.fromJson(content);
+}
+
+class ForwardedRoomKeyContent extends RoomKeyContent {
+  String senderKey;
+  String senderClaimedEd25519Key;
+  List<String> forwardingCurve25519KeyChain;
+  ForwardedRoomKeyContent.fromJson(Map<String, dynamic> json)
+      : senderKey = json.tryGet<String>('sender_key', ''),
+        senderClaimedEd25519Key =
+            json.tryGet<String>('sender_claimed_ed25519_key', ''),
+        forwardingCurve25519KeyChain =
+            json.tryGetList<String>('forwarding_curve25519_key_chain', []),
+        super.fromJson(json);
+
+  @override
+  Map<String, dynamic> toJson() {
+    final data = super.toJson();
+    data['sender_key'] = senderKey;
+    data['sender_claimed_ed25519_key'] = senderClaimedEd25519Key;
+    data['forwarding_curve25519_key_chain'] = forwardingCurve25519KeyChain;
+
+    return data;
+  }
+}

lib/src/model/events/room_key_content.dart

@@ -11,6 +11,8 @@ class RoomKeyContent {
   String sessionId;
   String sessionKey;
 
+  RoomKeyContent();
+
   RoomKeyContent.fromJson(Map<String, dynamic> json)
       : algorithm = json.tryGet<String>('algorithm', ''),
         roomId = json.tryGet<String>('room_id', ''),

lib/src/utils/try_get_map_extension.dart

@@ -15,4 +15,25 @@ extension TryGetMapExtension on Map<String, dynamic> {
     }
     return value;
   }
+
+  List<T> tryGetList<T>(String key, [List<T> fallbackValue]) {
+    final value = this[key];
+    if (value != null && !(value is List)) {
+      Logs().w(
+          'Expected "${T.runtimeType}" in event content for the key "$key" but got "${value.runtimeType}".');
+      return fallbackValue;
+    }
+    if (value == null && fallbackValue != null) {
+      Logs().w(
+          'Required field in event content for the key "$key" is null. Set to "$fallbackValue".');
+      return fallbackValue;
+    }
+    try {
+      return List<T>.from(value as List<dynamic>);
+    } catch (_) {
+      Logs().w(
+          'Unable to create List<${T.runtimeType}> in event content for the key "$key');
+      return fallbackValue;
+    }
+  }
 }

test/event_content_test.dart

@@ -18,6 +18,7 @@
 
 import 'package:matrix_api_lite/matrix_api_lite.dart';
 import 'package:test/test.dart';
+import 'dart:convert';
 
 void main() {
   group('Event Content tests', () {
@@ -36,6 +37,7 @@ void main() {
         'type': 'm.room.encryption',
         'unsigned': {'age': 1234}
       };
+      json = jsonDecode(jsonEncode(json));
       expect(MatrixEvent.fromJson(json).parsedRoomEncryptionContent.toJson(),
           json['content']);
     });
@@ -55,6 +57,7 @@ void main() {
         'type': 'm.room.encrypted',
         'unsigned': {'age': 1234}
       };
+      json = jsonDecode(jsonEncode(json));
       expect(MatrixEvent.fromJson(json).parsedRoomEncryptedContent.toJson(),
           json['content']);
       json = <String, dynamic>{
@@ -75,6 +78,7 @@ void main() {
         'type': 'm.room.encrypted',
         'unsigned': {'age': 1234}
       };
+      json = jsonDecode(jsonEncode(json));
       expect(MatrixEvent.fromJson(json).parsedRoomEncryptedContent.toJson(),
           json['content']);
     });
@@ -88,6 +92,7 @@ void main() {
         },
         'type': 'm.room_key'
       };
+      json = jsonDecode(jsonEncode(json));
       expect(BasicEvent.fromJson(json).parsedRoomKeyContent.toJson(),
           json['content']);
     });
@@ -100,6 +105,7 @@ void main() {
         },
         'type': 'm.room_key_request'
       };
+      json = jsonDecode(jsonEncode(json));
       expect(BasicEvent.fromJson(json).parsedRoomKeyRequestContent.toJson(),
           json['content']);
       json = <String, dynamic>{
@@ -116,8 +122,29 @@ void main() {
         },
         'type': 'm.room_key_request'
       };
+      json = jsonDecode(jsonEncode(json));
       expect(BasicEvent.fromJson(json).parsedRoomKeyRequestContent.toJson(),
           json['content']);
     });
+    test('Forwarded Room Key Content', () {
+      var json = <String, dynamic>{
+        'content': {
+          'algorithm': 'm.megolm.v1.aes-sha2',
+          'forwarding_curve25519_key_chain': [
+            'hPQNcabIABgGnx3/ACv/jmMmiQHoeFfuLB17tzWp6Hw'
+          ],
+          'room_id': '!Cuyf34gef24t:localhost',
+          'sender_claimed_ed25519_key':
+              'aj40p+aw64yPIdsxoog8jhPu9i7l7NcFRecuOQblE3Y',
+          'sender_key': 'RF3s+E7RkTQTGF2d8Deol0FkQvgII2aJDf3/Jp5mxVU',
+          'session_id': 'X3lUlvLELLYxeTx4yOVu6UDpasGEVO0Jbu+QFnm0cKQ',
+          'session_key': 'AgAAAADxKHa9uFxcXzwYoNueL5Xqi69IkD4sni8Llf...'
+        },
+        'type': 'm.forwarded_room_key'
+      };
+      json = jsonDecode(jsonEncode(json));
+      expect(BasicEvent.fromJson(json).parsedForwardedRoomKeyContent.toJson(),
+          json['content']);
+    });
   });
 }