[Spring] 웹소켓에서 가상의 유저(Principal) 생성하기(no Security)

public class AssignPrincipalHandshakeHandler extends DefaultHandshakeHandler {
    @Override
    protected Principal determineUser(ServerHttpRequest request, WebSocketHandler wsHandler, Map<String, Object> attributes) {
        String name = UUID.randomUUID().toString();
        return new Principal() {
            @Override
            public String getName() {
                return name;
            }
        };
    }
}

@Configuration
@EnableWebSocketMessageBroker
public class StompWebSocketConfig implements WebSocketMessageBrokerConfigurer {
    @Override
    public void registerStompEndpoints(StompEndpointRegistry registry) {
        registry.addEndpoint("/websocket")
                .setHandshakeHandler(new AssignPrincipalHandshakeHandler())
                .withSockJS();
    }
}

@Component
public class SessionEventListener {
    @EventListener
    private void handleSessionConnected(SessionConnectedEvent event) {
        StompHeaderAccessor accessor
                = MessageHeaderAccessor.getAccessor(
                (GenericMessage)event.getMessage().getHeaders().get("simpConnectMessage"), StompHeaderAccessor.class);
        String userId = accessor.getUser().getName();
        String sessionId = accessor.getSessionId();
        System.out.println("userId = " + userId);
    }
}