UnlockChina.js

"use strict";

var http = require("http");
var url = require("url");

var publicIp;
var fakeIp = "220.181.111." + Math.floor(Math.random() * 254 + 1);

var server = http.createServer(function(request, response) {
	console.log("[%s] %s", request.method, request.url);

	var options = url.parse(request.url);
	options.method = request.method;
	options.headers = request.headers;
	options.headers["X-Forwarded-For"] = fakeIp;
	options.headers["Client-IP"] = fakeIp;

	if (options.path.indexOf(publicIp) > -1) {
		options.path = options.path.replace(publicIp, fakeIp);
	}

	var proxyRequest = http.request(options, function(proxyResponse) {
		response.writeHead(proxyResponse.statusCode, proxyResponse.headers);
		proxyResponse.on("data", function(data) {
			response.write(data, "binary");
		});
		proxyResponse.on("end", function() {
			response.end();
		});
		proxyResponse.on("error", function(error) {
			console.error(error);
		});
	});
	proxyRequest.on("error", function(error) {
		console.error(error);
	});

	request.on("data", function(data) {
		proxyRequest.write(data, "binary");
	});
	request.on("end", function() {
		proxyRequest.end();
	});
	request.on("error", function(error) {
		console.error(error);
	});
	response.on("error", function(error) {
		console.error(error);
	});
});

function start(server) {
	var jsonString = "";
	var request = http.request({
		hostname: "jsonip.com"
	}, function(response) {
		response.on("data", function(data) {
			jsonString += data;
		});

		response.on("end", function() {
			publicIp = JSON.parse(jsonString).ip;
			if (publicIp) {
				console.log("Public IP: %s", publicIp);
				server.listen(8080);
			} else {
				console.log("CANNOT get public IP!");
			}
		});
	});

	request.end();
}

start(server);