Issue 2401 - Integrate CSS property rule handling in Firefox

lib/child/cssProperties.js

Index: lib/child/cssProperties.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/child/cssProperties.js
@@ -0,0 +1,97 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 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/>.
+ */
+
+"use strict";
+
+(function()
+{
+  let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
+
+  let {port} = require("messaging");
+  let {getFrames} = require("child/utils");
+
+  let senderWindow = null;
+
+  let scope = {
+    ext: {
+      backgroundPage: {
+        sendMessage: function(data, callback)
+        {
+          data = {payload: data, frames: getFrames(senderWindow)};
+          if (typeof callback == "function")
+            port.emitWithResponse("cssPropertiesRequest", data).then(callback);
+          else
+            port.emit("cssPropertiesRequest", data);
+        }
+      }
+    }
+  };
+
+  function addUserCSS(window, cssCode)
+  {
+    let uri = Services.io.newURI("data:text/css," + encodeURIComponent(cssCode),
+        null, null);
+    let utils = window.QueryInterface(Ci.nsIInterfaceRequestor)
+                      .getInterface(Ci.nsIDOMWindowUtils);
+    utils.loadSheet(uri, Ci.nsIDOMWindowUtils.USER_SHEET);
+  }
+
+  function initCSSPropertyFilters()
+  {
+    Services.scriptloader.loadSubScript(
+        "chrome://adblockplus/content/cssProperties.js", scope);
+
+    let onContentWindow = (subject, topic, data) =>
+    {
+      if (!(subject instanceof Ci.nsIDOMWindow))
+        return;
+
+      let onReady = event =>
+      {
+        subject.removeEventListener("DOMContentLoaded", onReady);
+        let handler = new scope.CSSPropertyFilters(subject, selectors =>
+        {
+          if (selectors.length == 0)
+            return;
+
+          addUserCSS(subject, selectors.map(
+            selector => selector + "{display: none !important;}"
+          ).join("\n"));
+        });
+
+        // HACK: The content script just calls ext.backgroundPage.sendMessage
+        // without indicating which window this is about. We'll store the window
+        // here because we know that messaging happens synchronously.
+        senderWindow = subject;
+        handler.load(() => handler.apply());
+        senderWindow = null;
+      };
+
+      subject.addEventListener("DOMContentLoaded", onReady);
+    };
+
+    Services.obs.addObserver(onContentWindow, "content-document-global-created",
+        false);
+    onShutdown.add(() =>
+    {
+      Services.obs.removeObserver(onContentWindow,
+          "content-document-global-created");
+    });
+  }
+
+  initCSSPropertyFilters();
+})();