Noissue - Merge current tip to Edge bookmark

include.preload.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
- * Copyright (C) 2006-2016 Eyeo GmbH
+ * Copyright (C) 2006-2017 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/>.
  */
 
+/* globals ElemHideEmulation, splitSelector */
+
 "use strict";
 
-const typeMap = {
-  "img": "IMAGE",
-  "input": "IMAGE",
-  "picture": "IMAGE",
-  "audio": "MEDIA",
-  "video": "MEDIA",
-  "frame": "SUBDOCUMENT",
-  "iframe": "SUBDOCUMENT",
-  "object": "OBJECT",
-  "embed": "OBJECT"
-};
+// This variable is also used by our other content scripts.
+let elemhide;
+
+const typeMap = new Map([
+  ["img", "IMAGE"],
+  ["input", "IMAGE"],
+  ["picture", "IMAGE"],
+  ["audio", "MEDIA"],
+  ["video", "MEDIA"],
+  ["frame", "SUBDOCUMENT"],
+  ["iframe", "SUBDOCUMENT"],
+  ["object", "OBJECT"],
+  ["embed", "OBJECT"]
+]);
 
 function getURLsFromObjectElement(element)
 {
   let url = element.getAttribute("data");
   if (url)
     return [url];
 
   for (let child of element.children)
   {
     if (child.localName != "param")
       continue;
 
     let name = child.getAttribute("name");
-    if (name != "movie"  && // Adobe Flash
+    if (name != "movie" &&  // Adobe Flash
         name != "source" && // Silverlight
-        name != "src"    && // Real Media + Quicktime
+        name != "src" &&    // Real Media + Quicktime
         name != "FileName") // Windows Media
       continue;
 
     let value = child.getAttribute("value");
     if (!value)
       continue;
 
     return [value];
   }
 
@@ skipping 20 matching lines @@
   return urls;
 }
 
 function getURLsFromMediaElement(element)
 {
   let urls = getURLsFromAttributes(element);
 
   for (let child of element.children)
   {
     if (child.localName == "source" || child.localName == "track")
-      urls.push.apply(urls, getURLsFromAttributes(child));
+      urls.push(...getURLsFromAttributes(child));
   }
 
   if (element.poster)
     urls.push(element.poster);
 
   return urls;
 }
 
 function getURLsFromElement(element)
 {
@@ skipping 19 matching lines @@
   {
     if (/^(?!https?:)[\w-]+:/i.test(urls[i]))
       urls.splice(i--, 1);
   }
 
   return urls;
 }
 
 function checkCollapse(element)
 {
-  let mediatype = typeMap[element.localName];
+  let mediatype = typeMap.get(element.localName);
   if (!mediatype)
     return;
 
   let urls = getURLsFromElement(element);
   if (urls.length == 0)
     return;
 
   ext.backgroundPage.sendMessage(
     {
       type: "filters.collapse",
-      urls: urls,
-      mediatype: mediatype,
+      urls,
+      mediatype,
       baseURL: document.location.href
     },
 
     collapse =>
     {
       function collapseElement()
       {
         let propertyName = "display";
         let propertyValue = "none";
         if (element.localName == "frame")
@@ skipping 22 matching lines @@
   );
 }
 
 function checkSitekey()
 {
   let attr = document.documentElement.getAttribute("data-adblockkey");
   if (attr)
     ext.backgroundPage.sendMessage({type: "filters.addKey", token: attr});
 }
 
-function getContentDocument(element)
+function ElementHidingTracer()
 {
-  try
-  {
-    return element.contentDocument;
-  }
-  catch (e)
-  {
-    return null;
-  }
-}
-
-function ElementHidingTracer(selectors)
-{
-  this.selectors = selectors;
-
+  this.selectors = [];
   this.changedNodes = [];
   this.timeout = null;
-
   this.observer = new MutationObserver(this.observe.bind(this));
   this.trace = this.trace.bind(this);
 
   if (document.readyState == "loading")
     document.addEventListener("DOMContentLoaded", this.trace);
   else
     this.trace();
 }
 ElementHidingTracer.prototype = {
-  checkNodes(nodes)
+  addSelectors(selectors, filters)
   {
-    let matchedSelectors = [];
+    let pairs = selectors.map((sel, i) => [sel, filters && filters[i]]);
 
-    // Find all selectors that match any hidden element inside the given nodes.
-    for (let selector of this.selectors)
+    if (document.readyState != "loading")
+      this.checkNodes([document], pairs);
+
+    this.selectors.push(...pairs);
+  },
+
+  checkNodes(nodes, pairs)
+  {
+    let selectors = [];
+    let filters = [];
+
+    for (let [selector, filter] of pairs)
     {
-      for (let node of nodes)
+      nodes: for (let node of nodes)
       {
-        let elements = node.querySelectorAll(selector);
-        let matched = false;
-
-        for (let element of elements)
+        for (let element of node.querySelectorAll(selector))
         {
           // Only consider selectors that actually have an effect on the
           // computed styles, and aren't overridden by rules with higher
           // priority, or haven't been circumvented in a different way.
           if (getComputedStyle(element).display == "none")
           {
-            matchedSelectors.push(selector);
-            matched = true;
-            break;
+            // For regular element hiding, we don't know the exact filter,
+            // but the background page can find it with the given selector.
+            // In case of element hiding emulation, the generated selector
+            // we got here is different from the selector part of the filter,
+            // but in this case we can send the whole filter text instead.
+            if (filter)
+              filters.push(filter);
+            else
+              selectors.push(selector);
+
+            break nodes;
           }
         }
-
-        if (matched)
-          break;
       }
     }
 
-    if (matchedSelectors.length > 0)
+    if (selectors.length > 0 || filters.length > 0)
+    {
       ext.backgroundPage.sendMessage({
         type: "devtools.traceElemHide",
-        selectors: matchedSelectors
+        selectors, filters
       });
+    }
   },
 
   onTimeout()
   {
-    this.checkNodes(this.changedNodes);
+    this.checkNodes(this.changedNodes, this.selectors);
     this.changedNodes = [];
     this.timeout = null;
   },
 
   observe(mutations)
   {
     // Forget previously changed nodes that are no longer in the DOM.
     for (let i = 0; i < this.changedNodes.length; i++)
     {
       if (!document.contains(this.changedNodes[i]))
@@ skipping 41 matching lines @@
 
     // Check only nodes whose descendants have changed, and not more often
     // than once a second. Otherwise large pages with a lot of DOM mutations
     // (like YouTube) freeze when the devtools panel is active.
     if (this.timeout == null)
       this.timeout = setTimeout(this.onTimeout.bind(this), 1000);
   },
 
   trace()
   {
-    this.checkNodes([document]);
+    this.checkNodes([document], this.selectors);
 
     this.observer.observe(
       document,
       {
         childList: true,
         attributes: true,
         subtree: true
       }
     );
   },
 
   disconnect()
   {
     document.removeEventListener("DOMContentLoaded", this.trace);
     this.observer.disconnect();
     clearTimeout(this.timeout);
   }
 };
 
-function runInPageContext(fn, arg)
-{
-  let script = document.createElement("script");
-  script.type = "application/javascript";
-  script.async = false;
-  script.textContent = "(" + fn + ")(" + JSON.stringify(arg) + ");";
-  document.documentElement.appendChild(script);
-  document.documentElement.removeChild(script);
-}
-
-// Chrome doesn't allow us to intercept WebSockets[1], and therefore
-// some ad networks are misusing them as a way to serve adverts and circumvent
-// us. As a workaround we wrap WebSocket, preventing blocked WebSocket
-// connections from being opened.
-// [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=129353
-function wrapWebSocket()
-{
-  let eventName = "abpws-" + Math.random().toString(36).substr(2);
-
-  document.addEventListener(eventName, event =>
-  {
-    ext.backgroundPage.sendMessage({
-      type: "request.websocket",
-      url: event.detail.url
-    }, block =>
-    {
-      document.dispatchEvent(
-        new CustomEvent(eventName + "-" + event.detail.url, {detail: block})
-      );
-    });
-  });
-
-  runInPageContext(eventName =>
-  {
-    // As far as possible we must track everything we use that could be
-    // sabotaged by the website later in order to circumvent us.
-    let RealWebSocket = WebSocket;
-    let closeWebSocket = Function.prototype.call.bind(RealWebSocket.prototype.close);
-    let addEventListener = document.addEventListener.bind(document);
-    let removeEventListener = document.removeEventListener.bind(document);
-    let dispatchEvent = document.dispatchEvent.bind(document);
-    let CustomEvent = window.CustomEvent;
-
-    function checkRequest(url, callback)
-    {
-      let incomingEventName = eventName + "-" + url;
-      function listener(event)
-      {
-        callback(event.detail);
-        removeEventListener(incomingEventName, listener);
-      }
-      addEventListener(incomingEventName, listener);
-
-      dispatchEvent(new CustomEvent(eventName, {
-        detail: {url: url}
-      }));
-    }
-
-    function WrappedWebSocket(url)
-    {
-      // Throw correct exceptions if the constructor is used improperly.
-      if (!(this instanceof WrappedWebSocket)) return RealWebSocket();
-      if (arguments.length < 1) return new RealWebSocket();
-
-      let websocket;
-      if (arguments.length == 1)
-        websocket = new RealWebSocket(url);
-      else
-        websocket = new RealWebSocket(url, arguments[1]);
-
-      checkRequest(websocket.url, blocked =>
-      {
-        if (blocked)
-          closeWebSocket(websocket);
-      });
-
-      return websocket;
-    }
-    WrappedWebSocket.prototype = RealWebSocket.prototype;
-    WebSocket = WrappedWebSocket.bind();
-    Object.defineProperties(WebSocket, {
-      CONNECTING: {value: RealWebSocket.CONNECTING, enumerable: true},
-      OPEN: {value: RealWebSocket.OPEN, enumerable: true},
-      CLOSING: {value: RealWebSocket.CLOSING, enumerable: true},
-      CLOSED: {value: RealWebSocket.CLOSED, enumerable: true},
-      prototype: {value: RealWebSocket.prototype}
-    });
-
-    RealWebSocket.prototype.constructor = WebSocket;
-  }, eventName);
-}
-
 function ElemHide()
 {
   this.shadow = this.createShadowTree();
   this.style = null;
   this.tracer = null;
 
   this.elemHideEmulation = new ElemHideEmulation(
     window,
     callback =>
     {
@@ skipping 22 matching lines @@
     if (/\.(?:google|blogger)\.com$/.test(document.domain))
       return null;
 
     // Finally since some users have both AdBlock and Adblock Plus installed we
     // have to consider how the two extensions interact. For example we want to
     // avoid creating the shadowRoot twice.
     let shadow = document.documentElement.shadowRoot ||
                  document.documentElement.createShadowRoot();
     shadow.appendChild(document.createElement("shadow"));
 
-    // Stop the website from messing with our shadow root (#4191, #4298).
-    if ("shadowRoot" in Element.prototype)
-    {
-      runInPageContext(() =>
-      {
-        let ourShadowRoot = document.documentElement.shadowRoot;
-        if (!ourShadowRoot)
-          return;
-        let desc = Object.getOwnPropertyDescriptor(Element.prototype, "shadowRoot");
-        let shadowRoot = Function.prototype.call.bind(desc.get);
-
-        Object.defineProperty(Element.prototype, "shadowRoot", {
-          configurable: true, enumerable: true, get()
-          {
-            let shadow = shadowRoot(this);
-            return shadow == ourShadowRoot ? null : shadow;
-          }
-        });
-      }, null);
-    }
-
     return shadow;
   },
 
-  addSelectors(selectors)
+  addSelectors(selectors, filters)
   {
     if (selectors.length == 0)
       return;
 
     if (!this.style)
     {
       // Create <style> element lazily, only if we add styles. Add it to
       // the shadow DOM if possible. Otherwise fallback to the <head> or
       // <html> element. If we have injected a style element before that
       // has been removed (the sheet property is null), create a new one.
       this.style = document.createElement("style");
-      (this.shadow || document.head
-                   || document.documentElement).appendChild(this.style);
+      (this.shadow || document.head ||
+                      document.documentElement).appendChild(this.style);
 
       // It can happen that the frame already navigated to a different
       // document while we were waiting for the background page to respond.
       // In that case the sheet property will stay null, after addind the
       // <style> element to the shadow DOM.
       if (!this.style.sheet)
         return;
     }
 
     // If using shadow DOM, we have to add the ::content pseudo-element
     // before each selector, in order to match elements within the
     // insertion point.
+    let preparedSelectors = [];
     if (this.shadow)
     {
-      let preparedSelectors = [];
       for (let selector of selectors)
       {
         let subSelectors = splitSelector(selector);
         for (let subSelector of subSelectors)
           preparedSelectors.push("::content " + subSelector);
       }
-      selectors = preparedSelectors;
+    }
+    else
+    {
+      preparedSelectors = selectors;
     }
 
     // Safari only allows 8192 primitive selectors to be injected at once[1], we
     // therefore chunk the inserted selectors into groups of 200 to be safe.
     // (Chrome also has a limit, larger... but we're not certain exactly what it
     //  is! Edge apparently has no such limit.)
     // [1] - https://github.com/WebKit/webkit/blob/1cb2227f6b2a1035f7bdc46e5ab69debb75fc1de/Source/WebCore/css/RuleSet.h#L68
-    for (let i = 0; i < selectors.length; i += this.selectorGroupSize)
+    for (let i = 0; i < preparedSelectors.length; i += this.selectorGroupSize)
     {
-      let selector = selectors.slice(i, i + this.selectorGroupSize).join(", ");
+      let selector = preparedSelectors.slice(
+        i, i + this.selectorGroupSize
+      ).join(", ");
       this.style.sheet.insertRule(selector + "{display: none !important;}",
                                   this.style.sheet.cssRules.length);
     }
+
+    if (this.tracer)
+      this.tracer.addSelectors(selectors, filters);
   },
 
   apply()
   {
-    let selectors = null;
-    let elemHideEmulationLoaded = false;
-
-    let checkLoaded = function()
+    ext.backgroundPage.sendMessage({type: "get-selectors"}, response =>
     {
-      if (!selectors || !elemHideEmulationLoaded)
-        return;
-
       if (this.tracer)
         this.tracer.disconnect();
       this.tracer = null;
 
       if (this.style && this.style.parentElement)
         this.style.parentElement.removeChild(this.style);
       this.style = null;
 
-      this.addSelectors(selectors.selectors);
+      if (response.trace)
+        this.tracer = new ElementHidingTracer();
+
+      this.addSelectors(response.selectors);
       this.elemHideEmulation.apply();
-
-      if (selectors.trace)
-        this.tracer = new ElementHidingTracer(selectors.selectors);
-    }.bind(this);
-
-    ext.backgroundPage.sendMessage({type: "get-selectors"}, response =>
-    {
-      selectors = response;
-      checkLoaded();
-    });
-
-    this.elemHideEmulation.load(() =>
-    {
-      elemHideEmulationLoaded = true;
-      checkLoaded();
     });
   }
 };
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();
-  wrapWebSocket();
 
-  // This variable is also used by our other content scripts, outside of the
-  // current scope.
-  var elemhide = new ElemHide();
+  elemhide = new ElemHide();
   elemhide.apply();
 
   document.addEventListener("error", event =>
   {
     checkCollapse(event.target);
   }, true);
 
   document.addEventListener("load", event =>
   {
     let element = event.target;
     if (/^i?frame$/.test(element.localName))
       checkCollapse(element);
   }, true);
 }