Node.js Proxy Server with Basic Auth Sample

proxy_server.js

const http = require("http");
const { parse } = require("basic-auth");
const { PROXY_USERNAME, PROXY_PASSWORD } = process.env;
const PROXY_PORT = process.env.PROXY_PORT || 8000;

const check = (credentials) => {
  return (
    credentials &&
    credentials.username === PROXY_USERNAME &&
    credentials.pass === PROXY_PASSWORD
  );
};

const proxy_server = http.createServer(function (request, response) {
  const credentials = parse(request.headers["proxy-authorization"]);
  if (!check(credentials)) {
    response.statusCode = 401;
    response.end("Access denied");
  }

  const options = {
    port: 80,
    host: request.headers["host"],
    method: request.method,
    path: request.url,
    headers: request.headers,
  };

  const proxy_request = http.request(options);

  proxy_request.on("response", function (proxy_response) {
    proxy_response.on("data", function (chunk) {
      response.write(chunk, "binary");
    });
    proxy_response.on("end", function () {
      response.end();
    });
    response.writeHead(proxy_response.statusCode, proxy_response.headers);
  });

  request.on("data", function (chunk) {
    proxy_request.write(chunk, "binary");
  });

  request.on("end", function () {
    proxy_request.end();
  });
});
proxy_server.listen(PROXY_PORT);