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@amontalenti
Created November 21, 2012 17:16
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script injecting proxy for Node.JS
var httpProxy = require('http-proxy');
var url = require('url');
httpProxy.createServer(function(req, res, proxy) {
var isHtml = false,
write = res.write,
writeHead = res.writeHead,
params = url.parse(req.url, true).query,
dest = params.dest || 'localhost',
destination;
dest = dest.match(/^http/) ? dest : 'http://' + dest;
destination = url.parse(dest, true);
req.headers['host'] = destination.host;
req.headers['url'] = destination.href;
delete req.headers['accept-encoding'];
res.writeHead = function(code, headers) {
isHtml = headers['content-type'] && headers['content-type'].match('text/html');
writeHead.apply(this, arguments);
}
res.write = function(data, encoding) {
if (isHtml && params.dest) {
var str = data.toString();
var scriptTag = '<script type="text/javascript" src="http://code.jquery.com/jquery-1.7.min.js"></script>';
var baseTag = '<base href="' + (dest.replace(/\/$/, '') || '') + '"/>';
str = str.replace(/(<head[^>]*>)/, "$1" + "\n" + scriptTag + "\n" + baseTag);
data = new Buffer(str);
}
write.call(this, data, encoding);
};
proxy.proxyRequest(req, res, {
host: destination.host,
port: 80,
});
}).listen(9000, function () {
console.log("Waiting for requests...");
});
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