Issue 6786 - Switch Safari 12+ users to content blocking API

safari/ext/content.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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()
 {
   // the safari object is missing in frames created from javascript: URLs.
   // So we have to fallback to the safari object from the parent frame.
   if (!("safari" in window))
     window.safari = window.parent.safari;
 
 
   /* Intialization */
 
-  var beforeLoadEvent = document.createEvent("Event");
-  beforeLoadEvent.initEvent("beforeload", false, true);
+  var majorApplicationVersion = parseInt(navigator.userAgent.match(/Version\/([\d]+)/)[1]);
 
-  // Decide if we should use the new content blocker API or not. (Note when the
-  // API is used Safari breaks the canLoad function, making it either throw an
-  // exception or return true when used.)
+  var beforeLoadEvent;
   var usingContentBlockerAPI = true;
-  try
+
+  // Safari 12 automatically disables extensions which use the old canLoad API,
+  // so avoid using the old APIs on Safari 12!
+  if (majorApplicationVersion < 12)
   {
-    if (safari.self.tab.canLoad(beforeLoadEvent,
-                                {category: "request",
-                                 payload: {type: "prefs.get",
-                                           key: "safariContentBlocker"}}) != true)
-      usingContentBlockerAPI = false;
-  }
-  catch (e)
-  {
+    beforeLoadEvent = document.createEvent("Event");
+    beforeLoadEvent.initEvent("beforeload", false, true);
+
+    // Decide if we should use the new content blocker API or not. (Note when the
+    // API is used Safari breaks the canLoad function, making it either throw an
+    // exception or return true when used.)
+    try
+    {
+      if (safari.self.tab.canLoad(beforeLoadEvent,
+                                  {category: "request",
+                                   payload: {type: "prefs.get",
+                                             key: "safariContentBlocker"}}) != true)
+        usingContentBlockerAPI = false;
+    }
+    catch (e)
+    {
+    }
   }
 
   var isTopLevel;
   var isPrerendered;
   var documentId;
   function notifyFrameLoading()
   {
     isTopLevel = window == window.top;
     isPrerendered = document.visibilityState == "prerender";
     documentId = Math.random().toString().substr(2);
 
     // Notify the background page that this frame is loading, generating
     // ourselves a random documentId while we're at it. That way the background
     // page can communicate with us reliably, despite limitations in Safari's
     // extension API.
     safari.self.tab.dispatchMessage("loading",  {
       url: window.location.href,
       referrer: document.referrer,
       isTopLevel: isTopLevel,
       isPrerendered: isPrerendered,
       documentId: documentId,
-      legacyAPISupported: "canLoad" in safari.self.tab &&
+      legacyAPISupported: majorApplicationVersion < 12 &&
+                          "canLoad" in safari.self.tab &&
                           "onbeforeload" in Element.prototype
     });
   }
 
   // We must notify the background page when this page is first loadeding (now)
   // but also when it is re-shown (if the user uses the back button to return to
   // this page in the future).
   notifyFrameLoading();
   window.addEventListener("pageshow", function(event)
   {
@@ skipping 99 matching lines @@
   /* Background page */
 
   ext.backgroundPage = {
     sendMessage: function(message, responseCallback)
     {
       messageProxy.sendMessage(message, responseCallback,
                                {documentId: documentId});
     },
     sendMessageSync: function(message)
     {
-      return safari.self.tab.canLoad(
-        beforeLoadEvent,
-        {
-          category: "request",
-          documentId: documentId,
-          payload: message
-        }
-      );
+      if (majorApplicationVersion < 12)
+      {
+        return safari.self.tab.canLoad(
+          beforeLoadEvent,
+          {
+            category: "request",
+            documentId: documentId,
+            payload: message
+          }
+        );
+      }
     }
   };
 
 
   /* Message processing */
 
   var messageProxy = new ext._MessageProxy(safari.self.tab);
 
   safari.self.addEventListener("message", function(event)
   {
@@ skipping 19 matching lines @@
   });
 
 
   /* Detecting extension reload/disable/uninstall (not supported on Safari) */
 
   ext.onExtensionUnloaded = {
     addListener: function() {},
     removeListener: function() {}
   };
 })();