Allow to send federation information in ext. signaling join

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>

NextcloudTalk/NCExternalSignalingController.h

@@ -45,7 +45,7 @@ typedef void (^JoinRoomExternalSignalingCompletionBlock)(NSError *error);
 - (instancetype)initWithAccount:(TalkAccount *)account server:(NSString *)serverUrl andTicket:(NSString *)ticket;
 - (BOOL)hasMCU;
 - (NSString *)sessionId;
-- (void)joinRoom:(NSString *)roomId withSessionId:(NSString *)sessionId withCompletionBlock:(JoinRoomExternalSignalingCompletionBlock)block;
+- (void)joinRoom:(NSString *)roomId withSessionId:(NSString *)sessionId withFederation:(NSDictionary * _Nullable)federationDict withCompletionBlock:(JoinRoomExternalSignalingCompletionBlock)block;
 - (void)leaveRoom:(NSString *)roomId;
 - (void)sendCallMessage:(NCSignalingMessage *)message;
 - (void)sendSendOfferMessageWithSessionId:(NSString *)sessionId andRoomType:(NSString *)roomType;

NextcloudTalk/NCExternalSignalingController.m

@@ -381,7 +381,7 @@ NSString * const NCExternalSignalingControllerDidReceiveStoppedTypingNotificatio
     [self executeCompletionBlockForMessageId:messageId withStatus:SendMessageApplicationError];
 }
 
-- (void)joinRoom:(NSString *)roomId withSessionId:(NSString *)sessionId withCompletionBlock:(JoinRoomExternalSignalingCompletionBlock)block
+- (void)joinRoom:(NSString *)roomId withSessionId:(NSString *)sessionId withFederation:(NSDictionary *)federationDict withCompletionBlock:(JoinRoomExternalSignalingCompletionBlock)block
 {
 
     if (_disconnected) {
@@ -400,6 +400,17 @@ NSString * const NCExternalSignalingControllerDidReceiveStoppedTypingNotificatio
                                           }
                                   };
 
+    if (federationDict) {
+        messageDict = @{
+            @"type": @"room",
+            @"room": @{
+                @"roomid": roomId,
+                @"sessionid": sessionId,
+                @"federation": federationDict
+            }
+        };
+    }
+
     [self sendMessage:messageDict withCompletionBlock:^(NSURLSessionWebSocketTask *task, NCExternalSignalingSendMessageStatus status) {
         if (status == SendMessageSocketError && task == self->_webSocket) {
             // Reconnect if this is still the same socket we tried to send the message on
@@ -425,7 +436,7 @@ NSString * const NCExternalSignalingControllerDidReceiveStoppedTypingNotificatio
 {
     if ([_currentRoom isEqualToString:roomId]) {
         _currentRoom = nil;
-        [self joinRoom:@"" withSessionId:@"" withCompletionBlock:nil];
+        [self joinRoom:@"" withSessionId:@"" withFederation:nil withCompletionBlock:nil];
     } else {
         NSLog(@"External signaling: Not leaving because it's not room we joined");
     }