Initial commit

app.js

@@ -0,0 +1,79 @@
+/***************
+ * 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 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 unblockerConfig = {
+    prefix: '/call/',
+    responseMiddleware: [
+        googleAnalyticsMiddleware
+    ]
+};
+
+
+
+// this line must appear before any express.static calls (or anything else that sends responses)
+app.use(unblocker(unblockerConfig));
+
+// 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("/b", 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);
+});
+
+// for compatibility with gatlin and other servers, export the app rather than passing it directly to http.createServer
+module.exports = app;