bobwatcherx/nodeunblock

1/***************2 * node-unblocker: Web Proxy for evading firewalls and content filters,3 * similar to CGIProxy or PHProxy4 *5 *6 * This project is hosted on github:  https://github.com/nfriedly/nodeunblocker.com7 *8 * By Nathan Friedly - http://nfriedly.com9 * Released under the terms of the Affero GPL v310 */11 12var url = require('url');13var querystring = require('querystring');14var express = require('express');15var Unblocker = require('unblocker');16var Transform = require('stream').Transform;17var youtube = require('unblocker/examples/youtube/youtube.js')18 19var app = express();20 21var google_analytics_id = process.env.GA_ID || null;22 23function addGa(html) {24    if (google_analytics_id) {25        var ga = [26            "<script type=\"text/javascript\">",27            "var _gaq = []; // overwrite the existing one, if any",28            "_gaq.push(['_setAccount', '" + google_analytics_id + "']);",29            "_gaq.push(['_trackPageview']);",30            "(function() {",31            "  var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;",32            "  ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';",33            "  var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);",34            "})();",35            "</script>"36            ].join("\n");37        html = html.replace("</body>", ga + "\n\n</body>");38    }39    return html;40}41 42function googleAnalyticsMiddleware(data) {43    if (data.contentType == 'text/html') {44 45        // https://nodejs.org/api/stream.html#stream_transform46        data.stream = data.stream.pipe(new Transform({47            decodeStrings: false,48            transform: function(chunk, encoding, next) {49                this.push(addGa(chunk.toString()));50                next();51            }52        }));53    }54}55 56var unblocker = new Unblocker({57    prefix: '/proxy/',58    requestMiddleware: [59        youtube.processRequest60    ],61    responseMiddleware: [62        googleAnalyticsMiddleware63    ]64});65 66// this line must appear before any express.static calls (or anything else that sends responses)67app.use(unblocker);68 69// serve up static files *after* the proxy is run70app.use('/', express.static(__dirname + '/public'));71 72// this is for users who's form actually submitted due to JS being disabled or whatever73app.get("/no-js", function(req, res) {74    // grab the "url" parameter from the querystring75    var site = querystring.parse(url.parse(req.url).query).url;76    // and redirect the user to /proxy/url77    res.redirect(unblockerConfig.prefix + site);78});79 80const port = process.env.PORT || process.env.VCAP_APP_PORT || 7860;81 82app.listen(port, function() {83    console.log(`node unblocker process listening at http://localhost:${port}/`);84}).on("upgrade", unblocker.onUpgrade); // onUpgrade handles websockets85