initial commit

Author: fippo

README.md

@@ -0,0 +1,11 @@
+This Chrome extension shows a [pageaction](https://developer.chrome.com/extensions/pageAction#method-show) when the [RTCPeerConnection API](http://w3c.github.io/webrtc-pc/) is used.
+Read the blogpost on webrtcH4cKs for a detailed description of how it works.
+
+## Limitations
+It does not work for sandboxed iframes [as described here](https://github.com/diafygi/webrtc-ips/pull/8).
+
+## Credits
+The WebRTCBlock 1.0 extension showed how to inject Javascript.
+
+## License
+MIT

background.js

@@ -0,0 +1,7 @@
+chrome.runtime.onConnect.addListener(function (channel) {
+    channel.onMessage.addListener(function (message, port) {
+        if (message[0] !== 'WebRTCSnoop') return;
+        console.log(new Date(), message[1], message[2]);
+        chrome.pageAction.show(port.sender.tab.id);
+    });
+});

manifest.json

@@ -0,0 +1,20 @@
+{
+   "content_scripts": [ {
+      "js": [ "snoop.js" ],
+      "matches": [ "http://*/*", "https://*/*" ],
+      "all_frames": true,
+      "match_about_blank": true,
+      "run_at": "document_start"
+   } ],
+  "background": {
+    "scripts": ["background.js"],
+    "persistent": false
+  },
+  "page_action": {
+    "default_icon": "icon_48.png",
+    "default_title": "This site uses WebRTC."
+  },
+   "manifest_version": 2,
+   "name": "WebRTC Notifier",
+   "version": "0.0.1"
+}

snoop.js

@@ -0,0 +1,27 @@
+var inject = '('+function() {
+  // taken from adapter.js, written by me
+  ['createOffer', 'createAnswer',
+      'setLocalDescription', 'setRemoteDescription'].forEach(function(method) {
+    var nativeMethod = webkitRTCPeerConnection.prototype[method];
+    webkitRTCPeerConnection.prototype[method] = function() {
+      // TODO: serialize arguments
+      var self = this;
+      this.addEventListener('icecandidate', function() {
+        //console.log('ice candidate', arguments);
+      }, false);
+      window.postMessage(['WebRTCSnoop', window.location.href, method], '*');
+      return nativeMethod.apply(this, arguments);
+    };
+  });
+}+')();';
+var script = document.createElement('script');
+script.textContent = inject;
+(document.head||document.documentElement).appendChild(script);
+script.parentNode.removeChild(script);
+
+var channel = chrome.runtime.connect();
+window.addEventListener('message', function (event) {
+    if (typeof(event.data) === 'string') return;
+    if (event.data[0] !== 'WebRTCSnoop') return;
+    channel.postMessage(event.data);
+});