const express = require("express");
const http = require("http");
const httpProxy = require("http-proxy");

const TARGET = "http://144.217.64.5:7700";

const app = express();

app.set("trust proxy", false);

const proxy = httpProxy.createProxyServer({
    target: TARGET,
    changeOrigin: true,
    ws: true,
    secure: false,
    xfwd: false,
    autoRewrite: true,
    preserveHeaderKeyCase: true
});

proxy.on("proxyReq", (proxyReq, req) => {
    proxyReq.removeHeader("x-forwarded-for");
    proxyReq.removeHeader("x-forwarded-host");
    proxyReq.removeHeader("x-forwarded-proto");

    proxyReq.setHeader("origin", TARGET);
    proxyReq.setHeader("referer", TARGET);
    proxyReq.setHeader("connection", "keep-alive");
});

proxy.on("error", (err, req, res) => {
    console.log("Proxy error:", err.message);
    if (!res.headersSent) res.writeHead(502);
    res.end("Bad gateway");
});

app.use((req, res) => {
    proxy.web(req, res);
});

const server = http.createServer(app);

server.on("upgrade", (req, socket, head) => {
    proxy.ws(req, socket, head);
});

server.keepAliveTimeout = 65000;
server.headersTimeout = 66000;

server.listen(7860, () => {
    console.log("7860");
});