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/**
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* 企业信息查询接口调试代理（零依赖，Node >= 14）
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*
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* 用途：
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* 1. 托管同目录下的 index.html（访问 http://localhost:5500）
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* 2. 将其余请求原样转发到后端 127.0.0.1:8081，并在响应上附加 CORS 头，
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* 规避浏览器跨域限制，方便前端页面直接联调。
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*
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* 启动： node proxy.js
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* 自定义：PORT=5501 TARGET_PORT=9090 node proxy.js
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*/
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"use strict";
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const http = require("http");
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const https = require("https");
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const fs = require("fs");
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const path = require("path");
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const PORT = Number(process.env.PORT) || 9527;
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const TARGET_HOST = process.env.TARGET_HOST || "127.0.0.1";
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const TARGET_PORT = Number(process.env.TARGET_PORT) || 8081;
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const CX_HOST = process.env.CX_HOST || "api-cx.dingtax.cn";
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const PUB_HOST = process.env.PUB_HOST || "apit-dsb.dingtax.cn";
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const MIME = {
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".html": "text/html; charset=utf-8",
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".js": "text/javascript; charset=utf-8",
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".css": "text/css; charset=utf-8",
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".json": "application/json; charset=utf-8",
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".png": "image/png",
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".svg": "image/svg+xml",
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".ico": "image/x-icon"
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};
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function corsHeaders() {
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return {
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"Access-Control-Allow-Origin": "*",
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"Access-Control-Allow-Methods": "GET,POST,PUT,DELETE,PATCH,OPTIONS",
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"Access-Control-Allow-Headers": "Content-Type, Authorization, X-Requested-With"
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};
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}
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const server = http.createServer((req, res) => {
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const cors = corsHeaders();
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if (req.method === "OPTIONS") {
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res.writeHead(204, cors);
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return res.end();
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}
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// 静态文件：/ 及 /index.html，其余静态路径按扩展名尝试读取
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const urlPath = decodeURIComponent((req.url || "/").split("?")[0]);
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if (req.method === "GET" && !urlPath.startsWith("/dsb/") && !urlPath.startsWith("/cx/") && !urlPath.startsWith("/pub/")) {
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let file = path.join(__dirname, urlPath === "/" ? "index.html" : urlPath);
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if (!file.startsWith(__dirname)) file = path.join(__dirname, "index.html");
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fs.readFile(file, (err, buf) => {
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if (err) {
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res.writeHead(404, { ...cors, "Content-Type": "text/plain; charset=utf-8" });
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return res.end("404 Not Found: " + urlPath);
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}
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res.writeHead(200, { ...cors, "Content-Type": MIME[path.extname(file)] || "application/octet-stream" });
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res.end(buf);
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});
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return;
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}
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// /cx/* → 公网 api-cx.dingtax.cn (HTTPS)；/dsb/* → 本机后端 (HTTP)
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const isCx = urlPath.startsWith("/cx/");
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const isPub = urlPath.startsWith("/pub/");
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const qs = (req.url || "").split("?").slice(1).join("?");
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// apit-dsb 后端会校验 Origin/Referer（Invalid CORS request / Rap csrf Verify），转发前剥离浏览器来源头
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const fwdHeaders = { ...req.headers };
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["origin", "referer", "sec-fetch-site", "sec-fetch-mode", "sec-fetch-dest", "sec-fetch-user", "accept-language"].forEach(h => delete fwdHeaders[h]);
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const options = isCx
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? {
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host: CX_HOST,
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port: 443,
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path: req.url,
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method: req.method,
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headers: { ...fwdHeaders, host: CX_HOST },
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rejectUnauthorized: false
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}
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: isPub
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? {
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host: PUB_HOST,
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port: 443,
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path: "/dsb" + urlPath.slice(4) + (qs ? "?" + qs : ""),
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method: req.method,
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headers: { ...fwdHeaders, host: PUB_HOST },
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rejectUnauthorized: false
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}
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: {
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host: TARGET_HOST,
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port: TARGET_PORT,
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path: req.url,
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method: req.method,
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headers: { ...fwdHeaders, host: `${TARGET_HOST}:${TARGET_PORT}` }
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};
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const upstream = (isCx || isPub ? https : http).request(options, (proxyRes) => {
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res.writeHead(proxyRes.statusCode || 502, { ...proxyRes.headers, ...cors });
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proxyRes.pipe(res);
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});
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upstream.on("error", (e) => {
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res.writeHead(502, { ...cors, "Content-Type": "application/json; charset=utf-8" });
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res.end(JSON.stringify({
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code: "-1",
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message: `代理转发失败: ${e.message}（后端 ${TARGET_HOST}:${TARGET_PORT} 不可达？）`
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}));
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});
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req.pipe(upstream);
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});
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server.listen(PORT, () => {
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console.log("企业信息接口调试代理已启动");
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console.log(` 测试页面: http://localhost:${PORT}`);
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console.log(` 转发目标: http://${TARGET_HOST}:${TARGET_PORT}`);
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console.log(" 按 Ctrl+C 停止");
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});
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