feat: Implement room key request parsing

lib/matrix_api_lite.dart

@@ -82,6 +82,7 @@ export 'src/model/auth/authentication_user_identifier.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';
+export 'src/model/events/room_key_request_content.dart';
 export 'src/model/events/secret_storage_default_key_content.dart';
 export 'src/model/events/secret_storage_key_content.dart';
 export 'src/model/events/tombstone_content.dart';

lib/src/model/events/room_key_request_content.dart

@@ -0,0 +1,58 @@
+import '../basic_event.dart';
+import '../../utils/try_get_map_extension.dart';
+
+extension RoomKeyRequestContentBasicEventExtension on BasicEvent {
+  RoomKeyRequestContent get parsedRoomKeyRequestContent =>
+      RoomKeyRequestContent.fromJson(content);
+}
+
+class RoomKeyRequestContent {
+  RequestedKeyInfo body;
+  String action;
+  String requestingDeviceId;
+  String requestId;
+
+  RoomKeyRequestContent.fromJson(Map<String, dynamic> json)
+      : body = RequestedKeyInfo.fromJson(
+            json.tryGet<Map<String, dynamic>>('body')),
+        action = json.tryGet<String>('action', ''),
+        requestingDeviceId = json.tryGet<String>('requesting_device_id', ''),
+        requestId = json.tryGet<String>('request_id', '');
+
+  Map<String, dynamic> toJson() {
+    final data = <String, dynamic>{};
+    if (body != null) data['body'] = body.toJson();
+    data['action'] = action;
+    data['requesting_device_id'] = requestingDeviceId;
+    data['request_id'] = requestId;
+    return data;
+  }
+}
+
+class RequestedKeyInfo {
+  String algorithm;
+  String roomId;
+  String sessionId;
+  String senderKey;
+
+  RequestedKeyInfo();
+
+  factory RequestedKeyInfo.fromJson(Map<String, dynamic> json) {
+    if (json == null) return null;
+    final requestKeyInfo = RequestedKeyInfo();
+    requestKeyInfo.algorithm = json.tryGet<String>('algorithm', '');
+    requestKeyInfo.roomId = json.tryGet<String>('room_id', '');
+    requestKeyInfo.sessionId = json.tryGet<String>('session_id', '');
+    requestKeyInfo.senderKey = json.tryGet<String>('sender_key', '');
+    return requestKeyInfo;
+  }
+
+  Map<String, dynamic> toJson() {
+    final data = <String, dynamic>{};
+    data['algorithm'] = algorithm;
+    data['room_id'] = roomId;
+    data['session_id'] = sessionId;
+    data['sender_key'] = senderKey;
+    return data;
+  }
+}

test/event_content_test.dart

@@ -91,5 +91,33 @@ void main() {
       expect(BasicEvent.fromJson(json).parsedRoomKeyContent.toJson(),
           json['content']);
     });
+    test('Room Key Request Content', () {
+      var json = <String, dynamic>{
+        'content': {
+          'action': 'request_cancellation',
+          'request_id': '1495474790150.19',
+          'requesting_device_id': 'RJYKSTBOIE'
+        },
+        'type': 'm.room_key_request'
+      };
+      expect(BasicEvent.fromJson(json).parsedRoomKeyRequestContent.toJson(),
+          json['content']);
+      json = <String, dynamic>{
+        'content': {
+          'action': 'request',
+          'body': {
+            'algorithm': 'm.megolm.v1.aes-sha2',
+            'room_id': '!Cuyf34gef24t:localhost',
+            'sender_key': 'RF3s+E7RkTQTGF2d8Deol0FkQvgII2aJDf3/Jp5mxVU',
+            'session_id': 'X3lUlvLELLYxeTx4yOVu6UDpasGEVO0Jbu+QFnm0cKQ'
+          },
+          'request_id': '1495474790150.19',
+          'requesting_device_id': 'RJYKSTBOIE'
+        },
+        'type': 'm.room_key_request'
+      };
+      expect(BasicEvent.fromJson(json).parsedRoomKeyRequestContent.toJson(),
+          json['content']);
+    });
   });
 }