johnboxall/simple_proxy.js

## simple_proxy.js
var http = require('http');

var script = '<script type="text/javascript" src="http://m.com/static/tests/test-wired.js"></script>';
var host = "www.wired.com";

var headTagRe = /<head.*?>/i;
var htmlContentTypeRe = /text\/html/;

http.createServer(function (req, res) {
  var client = http.createClient(80, host);
  // TODO: copy req.headers and change host.
  //var proxyReq = c.request(req.method, req.url, req.headers);
  var proxyReq = client.request('GET', req.url, {'host': host});

  proxyReq.addListener('response', function (proxyRes) {
    res.writeHead(proxyRes.statusCode, proxyRes.headers);
    var needScript = htmlContentTypeRe.test(proxyRes.headers["content-type"]);
    proxyRes.addListener('data', function (chunk) {
      // chunk is a buffer. http://nodejs.org/api.html#buffers-2
      if (needScript) {
        needScript = false;
        var chunkStr = chunk.toString('utf8');
        //var index = chunkStr.indexOf('<head>');
        var match = headTagRe.exec(chunkStr);
        if (match && match.length) {
          var insertAt = match.index + match[0].length;
          chunkStr = chunkStr.slice(0, insertAt) + script + chunkStr.slice(insertAt);
          chunk = new Buffer(chunkStr.length);
          chunk.write(chunkStr);
        }
      }
      res.write(chunk, 'binary');
    });

    proxyRes.addListener('end', function () {
      res.end();
    });


  });

  req.addListener('end', function () {
    proxyReq.end()
  });
}).listen(8124, '127.0.0.1');

console.log('Server running at http://127.0.0.1:8124/');

## test-wired.js
document.addEventListener("DOMContentLoaded", function() {
    document.body.addEventListener("click", function(e) {
        if (e.target.nodeName.toLowerCase() == "a" && /^http:\/\/www\.wired\.com/.test(e.target.href)) {
            e.preventDefault();
            var url = "/" + e.target.href.split("/").slice(3).join("/");
            window.location = url;
        }
    }, false);
}, false);
	var http = require('http');

	var script = '<script type="text/javascript" src="http://m.com/static/tests/test-wired.js"></script>';
	var host = "www.wired.com";

	var headTagRe = /<head.*?>/i;
	var htmlContentTypeRe = /text\/html/;

	http.createServer(function (req, res) {
	var client = http.createClient(80, host);
	// TODO: copy req.headers and change host.
	//var proxyReq = c.request(req.method, req.url, req.headers);
	var proxyReq = client.request('GET', req.url, {'host': host});

	proxyReq.addListener('response', function (proxyRes) {
	res.writeHead(proxyRes.statusCode, proxyRes.headers);
	var needScript = htmlContentTypeRe.test(proxyRes.headers["content-type"]);
	proxyRes.addListener('data', function (chunk) {
	// chunk is a buffer. http://nodejs.org/api.html#buffers-2
	if (needScript) {
	needScript = false;
	var chunkStr = chunk.toString('utf8');
	//var index = chunkStr.indexOf('<head>');
	var match = headTagRe.exec(chunkStr);
	if (match && match.length) {
	var insertAt = match.index + match[0].length;
	chunkStr = chunkStr.slice(0, insertAt) + script + chunkStr.slice(insertAt);
	chunk = new Buffer(chunkStr.length);
	chunk.write(chunkStr);
	}
	}
	res.write(chunk, 'binary');
	});

	proxyRes.addListener('end', function () {
	res.end();
	});


	});

	req.addListener('end', function () {
	proxyReq.end()
	});
	}).listen(8124, '127.0.0.1');

	console.log('Server running at http://127.0.0.1:8124/');
	document.addEventListener("DOMContentLoaded", function() {
	document.body.addEventListener("click", function(e) {
	if (e.target.nodeName.toLowerCase() == "a" && /^http:\/\/www\.wired\.com/.test(e.target.href)) {
	e.preventDefault();
	var url = "/" + e.target.href.split("/").slice(3).join("/");
	window.location = url;
	}
	}, false);
	}, false);