Issue 1706 - Move first-run page to adblockplusui repository

ext/background.js

Index: ext/background.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/ext/background.js
@@ -0,0 +1,93 @@
+/*
+ * 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/>.
+ */
+
+let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", null);
+let {Services} = Cu.import("resource://gre/modules/Services.jsm", null);
+let {MessageProxy, EventTarget, getSender} = require("ext_common");
+exports.onMessage = new EventTarget();
+
+let messageProxy = new MessageProxy(
+    Cc["@mozilla.org/globalmessagemanager;1"]
+      .getService(Ci.nsIMessageListenerManager),
+    exports.onMessage);
+onShutdown.add(function()
+{
+  messageProxy._disconnect();
+});
+
+function Page(sender)
+{
+  this._sender = sender;
+}
+Page.prototype = {
+  sendMessage: function(message)
+  {
+    if (this._sender)
+      this._sender.sendAsyncMessage("AdblockPlus:Message", {payload: message});
+  }
+};
+exports.Page = Page;
+
+function PageMap()
+{
+  this._map = new Map();
+
+  Services.obs.addObserver(this, "message-manager-disconnect", true);
+  onShutdown.add(function()
+  {
+    Services.obs.removeObserver(this, "message-manager-disconnect");
+  }.bind(this));
+}
+PageMap.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
+
+  observe: function(subject, topic, data)
+  {
+    if (topic == "message-manager-disconnect")
+      this._map.delete(subject);
+  },
+
+  keys: function()
+  {
+    let result = [];
+    for (let sender of this._map.keys())
+      result.push(new Page(sender));
+    return result;
+  },
+
+  get: function(page)
+  {
+    return this._map.get(page._sender);
+  },
+
+  set: function(page, value)
+  {
+    if (page._sender)
+      this._map.set(page._sender, value);
+  },
+
+  has: function(page)
+  {
+    return this._map.has(page._sender);
+  },
+
+  delete: function(page)
+  {
+    this._map.delete(page._sender);
+  }
+};
+exports.PageMap = PageMap;