Align whitelisting behavior in Chrome with Firefox

webrequest.js

 /*
  * This Source Code is subject to the terms of the Mozilla Public License
  * version 2.0 (the "License"). You can obtain a copy of the License at
  * http://mozilla.org/MPL/2.0/.
  */
 
 chrome.webRequest.onBeforeRequest.addListener(onBeforeRequest, {urls: ["http://*/*", "https://*/*"]}, ["blocking"]);
 chrome.webRequest.onBeforeSendHeaders.addListener(onBeforeSendHeaders, {urls: ["http://*/*", "https://*/*"]}, ["requestHeaders", "blocking"]);
 chrome.tabs.onRemoved.addListener(forgetTab);
 
 var frames = {};
-var tabs = {};
 
 function onBeforeRequest(details)
 {
+  if (details.tabId == -1)
+    return {};
+
   var type = details.type;
   if (type == "main_frame" || type == "sub_frame")
-    recordFrame(details.tabId, details.frameId, details.url, type == "main_frame");
+    recordFrame(details.tabId, details.frameId, details.parentFrameId, details.url, type == "main_frame");

[Felix Dahlke, 2012/09/18 13:23:14]

type == "main_frame" is redundant here, I'd assign the result to a variable once
and use that.

 
   if (type == "main_frame")
-    return;
+    return {};
 
   // Type names match Mozilla's with main_frame and sub_frame being the only exceptions.
   if (type == "sub_frame")
     type = "SUBDOCUMENT";
   else
     type = type.toUpperCase();
 
-  var documentUrl = getFrameUrl(details.tabId, details.frameId);
-  var topUrl = getTabUrl(details.tabId);
-  if (type == "SUBDOCUMENT")
-    documentUrl = getFrameUrl(details.tabId, details.parentFrameId) || topUrl;
-
-  var filter = checkRequest(type, details.url, documentUrl, topUrl);
+  var frame = (type != "SUBDOCUMENT" ? details.frameId : details.parentFrameId);
+  var filter = checkRequest(type, details.tabId, details.url, frame);
   if (filter instanceof BlockingFilter)
   {
     var collapse = filter.collapse;
     if (collapse == null)
       collapse = (localStorage["hidePlaceholders"] != "false");
     if (collapse && type == "SUBDOCUMENT")
       return {redirectUrl: "about:blank"};
     else if (collapse && type == "IMAGE")
       return {redirectUrl: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAACklEQVR4nGMAAQAABQABDQottAAAAABJRU5ErkJggg=="};
     else
@@ skipping 11 matching lines @@
     var headers = details.requestHeaders || [];
     if (!headers.some(function(header) { header.name == "DNT";}))
     {
       headers.push({name: "DNT", value: "1"});
       return {requestHeaders: headers};
     }
   }
   return null;
 }
 
-function recordFrame(tabId, frameId, frameUrl, isMain)
+function recordFrame(tabId, frameId, parentFrameId, frameUrl, isMain)

[Felix Dahlke, 2012/09/18 13:23:14]

This parameter is no longer used, it could be removed from the signature.

 {
   if (!(tabId in frames))
     frames[tabId] = {};
-  frames[tabId][frameId] = frameUrl;
-
-  if (isMain)
-    tabs[tabId] = frameUrl;
+  frames[tabId][frameId] = {url: frameUrl, parent: parentFrameId};
 }
 
 function getFrameUrl(tabId, frameId)
 {
   if (tabId in frames && frameId in frames[tabId])
-    return frames[tabId][frameId];
+    return frames[tabId][frameId].url;
   return null;
 }
 
-function getTabUrl(tabId)
+function getFrameParent(tabId, frameId)
 {
-  if (tabId in tabs)
-    return tabs[tabId];
-  return null;
+  if (tabId in frames && frameId in frames[tabId])
+    return frames[tabId][frameId].parent;
+  return -1;
 }
 
 function forgetTab(tabId)
 {
   delete frames[tabId];
-  delete tabs[tabId];
 }
 
-function checkRequest(type, url, documentUrl, topUrl)
+function checkRequest(type, tabId, url, frameId)
 {
-  if (topUrl && isWhitelisted(topUrl))
+  if (isFrameWhitelisted(tabId, frameId))
     return false;
 
+  var documentUrl = getFrameUrl(tabId, frameId);
   if (!documentUrl)
-    documentUrl = topUrl;
+    return false;
 
   var requestHost = extractHostFromURL(url);
   var documentHost = extractHostFromURL(documentUrl);
   var thirdParty = isThirdParty(requestHost, documentHost);
   return defaultMatcher.matchesAny(url, type, documentHost, thirdParty);
 }
+
+function isFrameWhitelisted(tabId, frameId, type)
+{
+  var parent = frameId;
+  while (parent != -1)
+  {
+    var parentUrl = getFrameUrl(tabId, parent);
+    if (parentUrl && isWhitelisted(parentUrl, type))
+      return true;
+    parent = getFrameParent(tabId, parent);
+  }
+  return false;
+}