/// <summary> /// Called when a new client is connected via TMQ protocol /// </summary> public async Task <TmqServerSocket> Connected(ITwinoServer server, IConnectionInfo connection, ConnectionData data) { string clientId; bool found = data.Properties.TryGetValue(TmqHeaders.CLIENT_ID, out clientId); if (!found || string.IsNullOrEmpty(clientId)) { clientId = _server.ClientIdGenerator.Create(); } //if another client with same unique id is online, do not accept new client MqClient foundClient = _server.FindClient(clientId); if (foundClient != null) { await connection.Socket.SendAsync(await _writer.Create(MessageBuilder.Busy())); return(null); } if (_server.Options.ClientLimit > 0 && _server.GetOnlineClients() >= _server.Options.ClientLimit) { return(null); } //creates new mq client object MqClient client = new MqClient(_server, connection, _server.MessageIdGenerator, _server.Options.UseMessageId); client.Data = data; client.UniqueId = clientId.Trim(); client.Token = data.Properties.GetStringValue(TmqHeaders.CLIENT_TOKEN); client.Name = data.Properties.GetStringValue(TmqHeaders.CLIENT_NAME); client.Type = data.Properties.GetStringValue(TmqHeaders.CLIENT_TYPE); //authenticates client if (_server.Authenticator != null) { client.IsAuthenticated = await _server.Authenticator.Authenticate(_server, client); if (!client.IsAuthenticated) { await client.SendAsync(MessageBuilder.Unauthorized()); return(null); } } //client authenticated, add it into the connected clients list _server.AddClient(client); //send response message to the client, client should check unique id, //if client's unique id isn't permitted, server will create new id for client and send it as response await client.SendAsync(MessageBuilder.Accepted(client.UniqueId)); if (_server.ClientHandler != null) { await _server.ClientHandler.Connected(_server, client); } return(client); }