在Websocket会话中访问UserAgent？ [英] Access UserAgent in Websocket session?

问题描述

使用Java的JSR 356 - Java API for WebSocket的Tyrus参考实现，我找不到一种方法来访问用于Websocket升级的HTTP连接。因此，我无法访问浏览器发送的HTTP标头。

Using the Tyrus reference implementation of Java's "JSR 356 - Java API for WebSocket", I cannot find a way to access the HTTP connection that was used for the Websocket upgrades. Thus, I cannot access the HTTP headers that the browser sent.

有没有办法读取HTTP UserAgent标头？

Is there a way to read the HTTP UserAgent header?

将Session对象转换为TyrusSession或类似对象是可以接受的，我必须这样做才能获得远程地址。再次将UserAgent作为Websocket连接内的消息发送将是我的后备解决方案。

Casting a "Session" object to "TyrusSession" or similar would be acceptable, I have to do it to get the Remote Address anyway. Sending the UserAgent again as a message inside the Websocket connection would be my fallback solution.

推荐答案

警告：ServerEndpointConfig是共享的在所有端点实例中，可以同时完成多个升级请求！查看评论！

端点获取配置器：

import javax.websocket.EndpointConfig;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint(value = "/foo", configurator = MyServerEndpointConfigurator.class)
public class MyEndpoint {

    @OnOpen
    public void onOpen(Session session, EndpointConfig endpointConfig) throws Exception {
        String ip = ((TyrusSession) session).getRemoteAddr();
        String userAgent = (String) endpointConfig.getUserProperties().get("user-agent");
        ...
   }
}

配置器看起来像这个：

import javax.websocket.HandshakeResponse;
import javax.websocket.server.HandshakeRequest;
import javax.websocket.server.ServerEndpointConfig;

public class MyServerEndpointConfigurator extends ServerEndpointConfig.Configurator {

    @Override
    public void modifyHandshake(ServerEndpointConfig sec, HandshakeRequest request, HandshakeResponse response) {
        if (request.getHeaders().containsKey("user-agent")) {
            sec.getUserProperties().put("user-agent", request.getHeaders().get("user-agent").get(0)); // lower-case!
        }
    }
}

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