Issue 1663 - Emulate background page and implement proper message responder

background.js

Index: background.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/background.js
@@ -0,0 +1,163 @@
+/*
+ * This file is part of Adblock Plus <http://adblockplus.org/>,
+ * Copyright (C) 2006-2014 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+(function(global)
+{
+  function updateFromURL(data)
+  {
+    if (window.location.search)
+    {
+      var params = window.location.search.substr(1).split("&");
+      for (var i = 0; i < params.length; i++)
+      {
+        var parts = params[i].split("=", 2);
+        if (parts.length == 2 && parts[0] in data)
+          data[parts[0]] = decodeURIComponent(parts[1]);
+      }
+    }
+  }
+
+  var subscriptions =[
+    "https://easylist-downloads.adblockplus.org/easylistgermany+easylist.txt",
+    "https://easylist-downloads.adblockplus.org/exceptionrules.txt",
+    "https://easylist-downloads.adblockplus.org/fanboy-social.txt"
+  ];
+
+  global.Utils = {
+    getDocLink: function(link)
+    {
+      return "https://adblockplus.org/redirect?link=" + encodeURIComponent(link);
+    }
+  };
+
+  global.Subscription = function(url)
+  {
+    this.url = url;
+    this.title = "Subscription " + url;
+    this.disabled = false;
+    this.lastDownload = 1234;
+  };
+
+  global.Subscription.fromURL = function(url)
+  {
+    return new global.Subscription(url);
+  };
+
+  global.DownloadableSubscription = global.Subscription;
+  global.SpecialSubscription = function() {};
+
+  global.FilterStorage = {
+    get subscriptions()
+    {
+      return subscriptions.map(global.Subscription.fromURL);
+    },
+
+    get knownSubscriptions()
+    {
+      var result = {};
+      for (var i = 0; i < subscriptions.length; i++)
+        result[subscriptions[i]] = global.Subscription.fromURL(subscriptions[i]);
+      return result;
+    },
+
+    addSubscription: function(subscription)
+    {
+      var index = subscriptions.indexOf(subscription.url);
+      if (index < 0)
+      {
+        subscriptions.push(subscription.url);
+        global.FilterNotifier.triggerListeners("subscription.added", subscription);
+      }
+    },
+
+    removeSubscription: function(subscription)
+    {
+      var index = subscriptions.indexOf(subscription.url);
+      if (index >= 0)
+      {
+        subscriptions.splice(index, 1);
+        global.FilterNotifier.triggerListeners("subscription.removed", subscription);
+      }
+    }
+  };
+
+  global.BlockingFilter = function() {};
+
+  global.defaultMatcher = {
+    matchesAny: function(url, requestType, docDomain, thirdParty)
+    {
+      var params = {blockedURLs: ""};
+      updateFromURL(params);
+      var blocked = params.blockedURLs.split(",");
+      if (blocked.indexOf(url) >= 0)
+        return new global.BlockingFilter();
+      else
+        return null;
+    }
+  };
+
+  var notifierListeners = [];
+  global.FilterNotifier = {
+    addListener: function(listener)
+    {
+      if (notifierListeners.indexOf(listener) < 0)
+        notifierListeners.push(listener);
+    },
+
+    removeListener: function(listener)
+    {
+      var index = notifierListeners.indexOf(listener);
+      if (index >= 0)
+        notifierListeners.splice(index, 1);
+    },
+
+    triggerListeners: function()
+    {
+      var args = Array.prototype.slice.apply(arguments);
+      var listeners = notifierListeners.slice();
+      for (var i = 0; i < listeners.length; i++)
+        listeners[i].apply(null, args);
+    }
+  };
+
+  global.require = function(module)
+  {
+    if (module == "info")
+    {
+      var result = {
+        platform: "gecko",
+        platformVersion: "34.0",
+        application: "firefox",
+        applicationVersion: "34.0"
+      };
+      updateFromURL(result);
+      return result;
+    }
+    else
+      return undefined;
+  }
+
+  global.openOptions = function()
+  {
+    window.open("http://example.com/options.html", "_blank");
+  };
+
+  var issues = {seenDataCorruption: false, filterlistsReinitialized: false};
+  updateFromURL(issues);
+  global.seenDataCorruption = issues.seenDataCorruption;
+  global.filterlistsReinitialized = issues.filterlistsReinitialized;
+})(this);