Spring websocket send to specific people

Question

I have added custom token based authentication for my spring-web app and extending the same for spring websocket as shown below

public class WebSocketConfig          


        

Answer 1

In your Websocket controller you should do something like this :

@Controller
public class GreetingController {

    @Autowired
    private SimpMessagingTemplate messagingTemplate;

    @MessageMapping("/hello")
    public void greeting(Principal principal, HelloMessage message) throws  Exception {
        Greeting greeting = new Greeting();
        greeting.setContent("Hello!");
        messagingTemplate.convertAndSendToUser(message.getToUser(), "/queue/reply", greeting);
    }
}

On the client side, your user should subscribe to topic /user/queue/reply.

You must also add some destination prefixes :

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

    @Override
    public void configureMessageBroker(MessageBrokerRegistry config) {
        config.enableSimpleBroker("/topic", "/queue" ,"/user");
        config.setApplicationDestinationPrefixes("/app");
        config.setUserDestinationPrefix("/user");
    }
/*...*/
}

When your server receive a message on the /app/hello queue, it should send a message to the user in your dto. User must be equal to the user's principal.

I think the only problem in your code is that your "/user" is not in your destination prefixes. Your greetings messages are blocked because you sent them in a queue that begin with /user and this prefixe is not registered.

You can check the sources at git repo : https://github.com/simvetanylen/test-spring-websocket

Hope it works!