Intercept websocket request before proxying it to server via http-proxy

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Issue 类型
功能
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技术栈
javascript, node.js
领域
backend, networking

调研方向

先阅读 issue 中所示的 server.on('upgrade')、proxy.ws() 以及 proxyReqWs 事件周围的 websocket 流程，然后将其与 REST-proxyReq 流程进行比较。完成标准是：在对连接进行代理并将其路由到所选实例之前，有一条清晰且有文档记录的路径可以访问 websocket 身份验证数据。

由索引模型根据 Issue 内容生成。

描述

Here is my code for proxying the websocket request to the targer server. What I want to achieve is that like in case of REST requests in http-proxy, we use proxyReq event to modify the request if we want by accessing headers and req.body, I want to do the same for weboscket request as I want to access the authentication data auth that is passed from the socket client. I don't want to log or intercept the traffic sent or received after the weboscket connection, instead I want to intercept (not modify though) the actual request that contains data to authenticate the client on proxyReqws event or on upgrade event of server. Any help & guidance would be appreciated.

var app = express();
const fs = require('fs')
var https = require('https')
var httpProxy = require('http-proxy');
const credentials = { key: fs.readFileSync("localhost.key"), cert: fs.readFileSync("localhost.cert") };

var proxy = httpProxy.createProxyServer({ ws: true });
var server = https.createServer(credentials, app).listen(8080)

proxy.on('proxyReqWs', (proxyReq, req, socket, options, head) => {
    //before the request is actually proxyed to the target server
    //access websocket request & modify it
});

app.use('/socket.io', function (req, res) {
    proxy.on('proxyRes', function (proxyRes, req, res) {
     //on response, do something
    });
    proxy.on('error', function (err, req, res) {
        console.log(err)
    })
    proxy.web(req, res, { target: { host: address.host, port: address.port, path: '/socket.io' } })

})

server.on('upgrade', function (req, socket, head) {
    console.log("Upgraded to websockets")
    proxy.ws(req, socket, head, { target: { host: address.host, port: address.port, path: '/socket.io' } });
});

On the basis of information I get from auth, the request will be routed to the specific instance.

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