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/***************
* node-unblocker: Web Proxy for evading firewalls and content filters,
* similar to CGIProxy or PHProxy
*
*
* This project is hosted on github: https://github.com/nfriedly/nodeunblocker.com
*
* By Nathan Friedly - http://nfriedly.com
* Released under the terms of the Affero GPL v3
*/
var url = require('url');
var querystring = require('querystring');
var express = require('express');
var Unblocker = require('unblocker');
var Transform = require('stream').Transform;
var youtube = require('unblocker/examples/youtube/youtube.js')
var app = express();
var google_analytics_id = process.env.GA_ID || null;
function addGa(html) {
if (google_analytics_id) {
var ga = [
"<script type=\"text/javascript\">",
"var _gaq = []; // overwrite the existing one, if any",
"_gaq.push(['_setAccount', '" + google_analytics_id + "']);",
"_gaq.push(['_trackPageview']);",
"(function() {",
" var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;",
" ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';",
" var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);",
"})();",
"</script>"
].join("\n");
html = html.replace("</body>", ga + "\n\n</body>");
}
return html;
}
function googleAnalyticsMiddleware(data) {
if (data.contentType == 'text/html') {
// https://nodejs.org/api/stream.html#stream_transform
data.stream = data.stream.pipe(new Transform({
decodeStrings: false,
transform: function(chunk, encoding, next) {
this.push(addGa(chunk.toString()));
next();
}
}));
}
}
var unblocker = new Unblocker({
prefix: '/proxy/',
requestMiddleware: [
youtube.processRequest
],
responseMiddleware: [
googleAnalyticsMiddleware
]
});
// this line must appear before any express.static calls (or anything else that sends responses)
app.use(unblocker);
// serve up static files *after* the proxy is run
app.use('/', express.static(__dirname + '/public'));
// this is for users who's form actually submitted due to JS being disabled or whatever
app.get("/no-js", function(req, res) {
// grab the "url" parameter from the querystring
var site = querystring.parse(url.parse(req.url).query).url;
// and redirect the user to /proxy/url
res.redirect(unblockerConfig.prefix + site);
});
const port = process.env.PORT || process.env.VCAP_APP_PORT || 7860;
app.listen(port, function() {
console.log(`node unblocker process listening at http://localhost:${port}/`);
}).on("upgrade", unblocker.onUpgrade); // onUpgrade handles websockets
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