Issue 4577 - Remove Safari support

safari/ext/content.js

-/*
- * 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/>.
- */
-
-(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);
-
-  // 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 usingContentBlockerAPI = true;
-  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 &&
-                          "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)
-  {
-    if (event.persisted)
-      notifyFrameLoading();
-  });
-
-  // Notify the background page when a prerendered page is displayed. That way
-  // the existing page of the tab can be replaced with this new one.
-  if (isTopLevel && isPrerendered)
-  {
-    var onVisibilitychange = function()
-    {
-      safari.self.tab.dispatchMessage("replaced", {documentId: documentId});
-      document.removeEventListener("visibilitychange", onVisibilitychange);
-    };
-    document.addEventListener("visibilitychange", onVisibilitychange);
-  }
-
-  /* Web requests */
-
-  if (!usingContentBlockerAPI)
-  {
-    document.addEventListener("beforeload", function(event)
-    {
-      // we don't block non-HTTP requests anyway, so we can bail out
-      // without asking the background page. This is even necessary
-      // because passing large data (like a photo encoded as data: URL)
-      // to the background page, freezes Safari.
-      if (/^(?!https?:)[\w-]+:/.test(event.url))
-        return;
-
-      var type = "OTHER";
-      var eventName = "error";
-
-      switch(event.target.localName)
-      {
-        case "frame":
-        case "iframe":
-          type = "SUBDOCUMENT";
-          eventName = "load";
-          break;
-        case "img":
-        case "input":
-          type = "IMAGE";
-          break;
-        case "video":
-        case "audio":
-        case "source":
-          type = "MEDIA";
-          break;
-        case "object":
-        case "embed":
-          type = "OBJECT";
-          break;
-        case "script":
-          type = "SCRIPT";
-          break;
-        case "link":
-          if (/\bstylesheet\b/i.test(event.target.rel))
-            type = "STYLESHEET";
-          break;
-      }
-
-      if (!safari.self.tab.canLoad(
-        event, {
-          category: "webRequest",
-          url: event.url,
-          type: type,
-          documentId: documentId}))
-      {
-        event.preventDefault();
-
-        // Safari doesn't dispatch the expected events for elements that have
-        // been prevented from loading by having their "beforeload" event
-        // cancelled. That is a "load" event for blocked frames, and an "error"
-        // event for other blocked elements. We need to dispatch those events
-        // manually here to avoid breaking element collapsing and pages that
-        // rely on those events.
-        setTimeout(function()
-        {
-          var evt = document.createEvent("Event");
-          evt.initEvent(eventName, false, false);
-          event.target.dispatchEvent(evt);
-        });
-      }
-    }, true);
-  }
-
-
-  /* Context menus */
-
-  document.addEventListener("contextmenu", function(event)
-  {
-    var element = event.srcElement;
-    safari.self.tab.setContextMenuEventUserInfo(event, {
-      documentId: documentId,
-      tagName: element.localName
-    });
-  });
-
-
-  /* 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
-        }
-      );
-    }
-  };
-
-
-  /* Message processing */
-
-  var messageProxy = new ext._MessageProxy(safari.self.tab);
-
-  safari.self.addEventListener("message", function(event)
-  {
-    if (event.name == "requestDocumentId" && isTopLevel)
-    {
-      safari.self.tab.dispatchMessage("documentId",  {
-        pageId: event.message.pageId,
-        documentId: documentId
-      });
-    }
-    else if (event.message.targetDocuments.indexOf(documentId) != -1)
-    {
-      switch (event.name)
-      {
-        case "request":
-          messageProxy.handleRequest(event.message, {});
-          break;
-        case "response":
-          messageProxy.handleResponse(event.message);
-          break;
-      }
-    }
-  });
-
-
-  /* Detecting extension reload/disable/uninstall (not supported on Safari) */
-
-  ext.onExtensionUnloaded = {
-    addListener: function() {},
-    removeListener: function() {}
-  };
-})();