@Configuration
public class WebSocketConfiguration {

    @Bean  
    public ServerEndpointExporter serverEndpointExporter (){
        
        ServerEndpointExporter exporter = new ServerEndpointExporter();
        
        // 手动注册 WebSocket 端点
        exporter.setAnnotatedEndpointClasses(EchoChannel.class);
        
        return exporter;
    }  
}

@Configuration
@EnableWebSocketMessageBroker
public class WebsocketConfig implements WebSocketMessageBrokerConfigurer {

   /**
    * 注册stomp端点
    *
    * @param registry stomp端点注册对象
    */
   @Override
   public void registerStompEndpoints(StompEndpointRegistry registry) {
      registry.addEndpoint(WsConstants.WEBSOCKET_PATH)
            .setAllowedOrigins("*")
            .withSockJS();
   }

   /**
    * 配置消息代理
    *
    * @param registry 消息代理注册对象
    */
   @Override
   public void configureMessageBroker(MessageBrokerRegistry registry) {

      // 配置服务端推送消息给客户端的代理路径
      registry.enableSimpleBroker(WsConstants.BROKER.BROKER_QUEUE, WsConstants.BROKER.BROKER_TOPIC);
      
      // 定义点对点推送时的前缀为/queue
      registry.setUserDestinationPrefix(WsConstants.BROKER.BROKER_QUEUE);
      
      // 定义客户端访问服务端消息接口时的前缀
      registry.setApplicationDestinationPrefixes(WsConstants.WS_PERFIX);
   }
}

@RestController
@RequestMapping("/api")
@Slf4j
public class MsgController {

   private final SimpMessagingTemplate messagingTemplate;

   public MsgController(SimpMessagingTemplate messagingTemplate) {
      this.messagingTemplate = messagingTemplate;
   }

   /**
    * 发送广播消息
    * -- 说明：
    *       1）、@MessageMapping注解对应客户端的stomp.send('url')；
    *       2）、用法一：要么配合@SendTo("转发的订阅路径")，去掉messagingTemplate，同时return msg来使用，return msg会去找@SendTo注解的路径；
    *       3）、用法二：要么设置成void，使用messagingTemplate来控制转发的订阅路径，且不能return msg，个人推荐这种。
    *
    * @param msg 消息
    */
   @MessageMapping("/send")
   public void sendAll(@RequestParam String msg) {

      log.info("[发送消息]>>>> msg: {}", msg);

      // 发送消息给客户端
      messagingTemplate.convertAndSend(WsConstants.BROKER.BROKER_TOPIC, msg);
   }
}

@Component
public class AuthInterceptor implements HandlerInterceptor {

    public static final String PARAM_TOKEN = "x-auth-token";

    public static final String TOKEN_CLAIM = "customClaim";

//    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String uri = request.getRequestURI();
        log.debug("request uri: {}, IP: {}", uri, request.getRemoteAddr());
        // The options method is passed directly.
        if (HttpMethod.OPTIONS.matches(request.getMethod())) {
            response.setStatus(HttpStatus.OK.value());
            return false;
        }
        String token = request.getHeader(PARAM_TOKEN);
        // Check if the token exists.
        if (!StringUtils.hasText(token)) {
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
            log.error(CommonErrorEnum.NO_TOKEN.getMessage());
            return false;
        }

        // Check if the current token is valid.
        Optional<CustomClaim> customClaimOpt = JwtUtil.parseToken(token);
        if (customClaimOpt.isEmpty()) {
            response.setStatus(HttpStatus.UNAUTHORIZED.value());
            return false;
        }

        // Put the custom data from the token into the request.
        request.setAttribute(TOKEN_CLAIM, customClaimOpt.get());
        return true;
    }

//    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        // Delete the custom data in the request after the request ends.
        request.removeAttribute(TOKEN_CLAIM);
    }
}

@Slf4j
public class WebsocketFilter implements Filter {

    private static final String TOKEN_KEY = "Sec-WebSocket-Protocol";

    private static CommonAPI commonApi;

    private static RedisUtil redisUtil;

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        if (commonApi == null) {
            commonApi = SpringContextUtils.getBean(CommonAPI.class);
        }
        if (redisUtil == null) {
            redisUtil = SpringContextUtils.getBean(RedisUtil.class);
        }
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        String token = request.getHeader(TOKEN_KEY);

        log.debug("Websocket连接 Token安全校验，Path = {}，token:{}", request.getRequestURI(), token);

        try {
            TokenUtils.verifyToken(token, commonApi, redisUtil);
        } catch (Exception exception) {
            //log.error("Websocket连接 Token安全校验失败，IP:{}, Token:{}, Path = {}，异常：{}", oConvertUtils.getIpAddrByRequest(request), token, request.getRequestURI(), exception.getMessage());
            log.debug("Websocket连接 Token安全校验失败，IP:{}, Token:{}, Path = {}，异常：{}", oConvertUtils.getIpAddrByRequest(request), token, request.getRequestURI(), exception.getMessage());
            return;
        }

        // 带上协议头参数
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        response.setHeader(TOKEN_KEY, token);
        filterChain.doFilter(servletRequest, servletResponse);
    }

}