Issue 521- Inject our stylesheet on per-site basis rather than globally

lib/contentPolicy.js

 /*
  * 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
@@ skipping 12 matching lines @@
 Cu.import("resource://gre/modules/Services.jsm");
 
 let {TimeLine} = require("timeline");
 let {Utils} = require("utils");
 let {Prefs} = require("prefs");
 let {FilterStorage} = require("filterStorage");
 let {BlockingFilter, WhitelistFilter} = require("filterClasses");
 let {defaultMatcher} = require("matcher");
 let {objectMouseEventHander} = require("objectTabs");
 let {RequestNotifier} = require("requestNotifier");
+let {ElemHide} = require("elemHide");
 
 /**
  * List of explicitly supported content types
  * @type Array of String
  */
 let contentTypes = ["OTHER", "SCRIPT", "IMAGE", "STYLESHEET", "OBJECT", "SUBDOCUMENT", "DOCUMENT", "XMLHTTPREQUEST", "OBJECT_SUBREQUEST", "FONT", "MEDIA"];
 
 /**
  * List of content types that aren't associated with a visual document area
  * @type Array of String
@@ skipping 92 matching lines @@
     Utils.styleService.loadAndRegisterSheet(collapseStyle, Ci.nsIStyleSheetService.USER_SHEET);
     onShutdown.add(function()
     {
       Utils.styleService.unregisterSheet(collapseStyle, Ci.nsIStyleSheetService.USER_SHEET);
     })
     TimeLine.log("done registering stylesheet");
 
     TimeLine.leave("Done initializing content policy");
   },
 
-  processWindow: function(wnd)
+  /**
+   * Checks whether a window or its parent is whitelisted or has a valid site-key.
+   * @param wnd {nsIDOMWindow}
+   */
+  shouldNeverBlockWindow: function(wnd)
   {
     let uri = wnd.document.documentURIObject;
     if (!uri)
       return true;
 
     if (!Policy.isBlockableScheme(uri.scheme))
       return true;
 
     let topWnd = wnd.top;
     if (!topWnd || !topWnd.location || !topWnd.location.href)
@@ skipping 18 matching lines @@
           if (keyMatch && Utils.crypto)
           {
             // Website specifies a key that we know but is the signature valid?
             let uri = Services.io.newURI(testWndLocation, null, null);
             let params = [
               uri.path.replace(/#.*/, ""),  // REQUEST_URI
               uri.asciiHost,                // HTTP_HOST
               Utils.httpProtocol.userAgent  // HTTP_USER_AGENT
             ];
             if (Utils.verifySignature(key, signature, params.join("\0")))
-              match = keyMatch; // XXX what is this?
+              match = keyMatch;
           }
         }
       }
 
       if (match instanceof WhitelistFilter)
       {
         FilterStorage.increaseHitCount(match, wnd);
         RequestNotifier.addNodeData(testWnd.document, topWnd, Policy.type.DOCUMENT, getHostname(parentWndLocation), false, testWndLocation, match);
         return true;
       }
@@ skipping 11 matching lines @@
    * Checks whether a node should be blocked, hides it if necessary
    * @param wnd {nsIDOMWindow}
    * @param node {nsIDOMElement}
    * @param contentType {String}
    * @param location {nsIURI}
    * @param collapse {Boolean} true to force hiding of the node
    * @return {Boolean} false if the node should be blocked
    */
   processNode: function(wnd, node, contentType, location, collapse)
   {
-    if (Policy.processWindow(wnd))
+    if (Policy.shouldNeverBlockWindow(wnd))
       return true;
 
     let topWnd = wnd.top;
     let originWindow = Utils.getOriginWindow(wnd);
     let wndLocation = originWindow.location.href;
     let docDomain = getHostname(wndLocation);
 
     // Data loaded by plugins should be attached to the document
     if (contentType == Policy.type.OBJECT_SUBREQUEST && node instanceof Ci.nsIDOMElement)
       node = node.ownerDocument;
@@ skipping 27 matching lines @@
           testWnd = testWnd.parent;
       }
 
       match = location;
       locationText = match.text.replace(/^.*?#/, '#');
       location = locationText;
 
       if (!match.isActiveOnDomain(docDomain))
         return true;
 
-      let {ElemHide} = require("elemHide");
       let exception = ElemHide.getException(match, docDomain);
       if (exception)
       {
         FilterStorage.increaseHitCount(exception, wnd);
         RequestNotifier.addNodeData(node, topWnd, contentType, docDomain, thirdParty, locationText, exception);
         return true;
       }
     }
 
     let thirdParty = (contentType == Policy.type.ELEMHIDE ? false : isThirdParty(location, docDomain));
@@ skipping 505 matching lines @@
   if (!wnd || wnd.closed)
     return;
 
   if (entry.type == Policy.type.OBJECT)
   {
     node.removeEventListener("mouseover", objectMouseEventHander, true);
     node.removeEventListener("mouseout", objectMouseEventHander, true);
   }
   Policy.processNode(wnd, node, entry.type, Utils.makeURI(entry.location), true);
 }