gateway + websocket 实现权限校验

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添加websocket的依赖

<!-- SpringBoot Websocket -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

修改默认的数据传输大小及会话超时

@Configuration
public class WebSocketConfig {@Beanpublic ServerEndpointExporter serverEndpointExporter() {return new ServerEndpointExporter();}@Beanpublic ServletServerContainerFactoryBean servletServerContainerFactoryBean() {ServletServerContainerFactoryBean factoryBean = new ServletServerContainerFactoryBean();// 1MfactoryBean.setMaxTextMessageBufferSize(1024 * 1024);factoryBean.setMaxBinaryMessageBufferSize(1024 * 1024);// 30 分钟factoryBean.setMaxSessionIdleTimeout(1000 * 60 * 30L);return factoryBean;}
}

websocket服务端

@Slf4j
@Component
@ServerEndpoint(value = "/websocket/{clientId}", encoders = {WebSocketObjectEncoder.class})
public class WebSocketHandler {private RedisService redisService = SpringUtils.getBean(RedisService.class);private static final ConcurrentMap<String, Session> SESSION_MAP = new ConcurrentHashMap<>();private String clientId;@OnOpenpublic void onOpen(Session session, @PathParam("clientId") String clientId) throws IOException {String sessionId = session.getId();log.info("onOpen sessionId: {}, clientId: {}", sessionId, clientId);this.clientId = clientId;// 增加权限校验boolean res = this.validateToken(session.getRequestParameterMap());if (!res) {// 未校验通过直接断开session.close(new CloseReason(CloseReason.CloseCodes.PROTOCOL_ERROR, "非法请求"));return;}SESSION_MAP.put(clientId, session);this.sendText(session, String.format("客户端【%s】已连接", clientId));}@OnMessagepublic void onMessage(Session session, @PathParam("clientId") String clientId, String message) {String sessionId = session.getId();log.info("onMessage sessionId:{}, clientId:{}, message:{}", sessionId, clientId, message);this.sendText(session, String.format("客户端【%s】消息已收到", clientId));}@OnClosepublic void onClose(Session session) {log.info("sessionId-{} onClose ...", session.getId());SESSION_MAP.remove(this.clientId);}@OnErrorpublic void onError(Session session, Throwable throwable) throws IOException {log.error("Error for session " + session.getId() + " : " + throwable.getMessage());if (session.isOpen()) {session.close(new CloseReason(CloseReason.CloseCodes.UNEXPECTED_CONDITION, throwable.getMessage()));}SESSION_MAP.remove(this.clientId);}/*** 检验客户端身份** @param params* @return*/private boolean validateToken(Map<String, List<String>> params) {try {boolean res = true;String token = params.getOrDefault("token", new ArrayList<>()).get(0);if (StringUtils.isBlank(token)) {res = false;}Claims claims = JwtUtils.parseToken(token);String jwt_claims_key = "user_id";if (claims == null || !claims.containsKey(jwt_claims_key)) {res = false;}// RedisKey.USER_LOGIN_TOKEN = "user_login_token:%s"String redisKey = String.format(RedisKey.USER_LOGIN_TOKEN, JwtUtils.getUserId(claims));if(!redisService.hasKey(redisKey)){res = false;}return res;} catch (Exception e) {log.info("WebSocket token validate error: {}", e.getMessage());}return false;}/*** 发送消息，需要对Object进行序列化，所以WebSocketObjectEncoder是必须的* 或者直接在这里使用JSONObject.toJSONString(obj) 也是可以的** @param clientId* @param data*/public void sendMessage(String clientId, Object data) {try {if (SESSION_MAP.containsKey(clientId)) {SESSION_MAP.get(clientId).getBasicRemote().sendObject(data);}} catch (Exception e) {log.error("sendMessage error:{}", e.getMessage());}}/*** 发送文本消息** @param session* @param message*/private void sendText(Session session, String message) {try {session.getBasicRemote().sendText(message);} catch (IOException e) {e.printStackTrace();}}
}

序列化工具 WebSocketObjectEncoder

public class WebSocketObjectEncoder implements Encoder.Text<Object> {@Overridepublic String encode(Object obj) throws EncodeException {return JSONObject.toJSONString(obj);}@Overridepublic void init(EndpointConfig endpointConfig) {}@Overridepublic void destroy() {}
}

在gateway中配置路由

spring:cloud:gateway:discovery:locator:lowerCaseServiceId: trueenabled: falseroutes:# WEBSOCKET服务- id: websocketuri: lb:ws://websocketpredicates: - Path=/websocket/**# 安全配置
security:# 不校验白名单ignore:whites:- /websocket/**

测试
使用Postman，点击左上角的Menu - File - New...
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找到WebSocket

url中填写ws://localhost/websocket/{clientId}?token={token}，如果是使用ssl证书的域名，则填写wss://www.xxx.com/websocket/{clientId}?token={token}

如果能正常接收到服务端返回的消息说明连接成功

如果token校验错误则会立即断开连接，点击右边的箭头可以查看具体异常信息
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