Issue 6622 - Implement $rewrite filter option

lib/requestBlocker.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/>.
  */
 
 /** @module requestBlocker */
 
 "use strict";
 
 const {Filter, RegExpFilter, BlockingFilter} =
   require("../adblockpluscore/lib/filterClasses");
 const {Subscription} = require("../adblockpluscore/lib/subscriptionClasses");
 const {defaultMatcher} = require("../adblockpluscore/lib/matcher");
 const {FilterNotifier} = require("../adblockpluscore/lib/filterNotifier");
 const {Prefs} = require("./prefs");
 const {checkWhitelisted, getKey} = require("./whitelisting");
-const {stringifyURL, extractHostFromFrame, isThirdParty} = require("./url");
+const {extractHostFromFrame, isThirdParty} = require("./url");
 const {port} = require("./messaging");
-const devtools = require("./devtools");
+const {logRequest: hitLoggerLogRequest} = require("./hitLogger");
 
 const extensionProtocol = new URL(browser.extension.getURL("")).protocol;
 
 // Chrome can't distinguish between OBJECT_SUBREQUEST and OBJECT requests.
 if (!browser.webRequest.ResourceType ||
     !("OBJECT_SUBREQUEST" in browser.webRequest.ResourceType))
 {
   RegExpFilter.typeMap.OBJECT_SUBREQUEST = RegExpFilter.typeMap.OBJECT;
 }
 
@@ skipping 21 matching lines @@
   if (!(browser.webRequest.ResourceType))
     return;
 
   for (let type in browser.webRequest.ResourceType)
     yield resourceTypes.get(browser.webRequest.ResourceType[type]) || "OTHER";
 
   // WEBRTC gets addressed through a workaround, even if the webRequest API is
   // lacking support to block this kind of a request.
   yield "WEBRTC";
 
-  // POPUP, CSP, REWRITE and ELEMHIDE filters aren't mapped to resource types.
+  // POPUP, CSP and ELEMHIDE filters aren't mapped to resource types.
   yield "POPUP";
   yield "ELEMHIDE";
   yield "CSP";
-  yield "REWRITE";
 }());
 
 function getDocumentInfo(page, frame, originUrl)
 {
   return [
     extractHostFromFrame(frame, originUrl),
     getKey(page, frame, originUrl),
     !!checkWhitelisted(page, frame, originUrl,
                        RegExpFilter.typeMap.GENERICBLOCK)
   ];
 }
 
 function matchRequest(url, type, docDomain, sitekey, specificOnly)
 {
-  let urlString = stringifyURL(url);
   let thirdParty = isThirdParty(url, docDomain);
-
-  return [
-    defaultMatcher.matchesAny(urlString, RegExpFilter.typeMap[type],
-                              docDomain, thirdParty, sitekey, specificOnly),
-    urlString,
-    thirdParty
-  ];
+  let filter = defaultMatcher.matchesAny(url.href, RegExpFilter.typeMap[type],
+                                         docDomain, thirdParty,
+                                         sitekey, specificOnly);
+  return [filter, thirdParty];
 }
 
 function getRelatedTabIds(details)
 {
   // This is the common case, the request is associated with a single tab.
   // If tabId is -1, its not (e.g. the request was sent by
   // a Service/Shared Worker) and we have to identify the related tabs.
   if (details.tabId != -1)
     return Promise.resolve([details.tabId]);
 
   let url;                    // Firefox provides "originUrl" indicating the
   if (details.originUrl)      // URL of the tab that caused this request.
     url = details.originUrl;  // In case of Service/Shared Worker, this is the
                               // URL of the tab that caused the worker to spawn.
 
-  else if (details.initiator)        // Chromium >=63 provides "intiator" which
-    url = details.initiator + "/*";  // is equivalent to "originUrl" on Firefox
+  else if (details.initiator && details.initiator != "null")
+    url = details.initiator + "/*";  // Chromium >=63 provides "intiator" which
+                                     // is equivalent to "originUrl" on Firefox
                                      // except that its not a full URL but just
                                      // an origin (proto + host).
   else
     return Promise.resolve([]);
 
   return browser.tabs.query({url}).then(tabs => tabs.map(tab => tab.id));
 }
 
-function logRequest(tabIds, url, type, docDomain, thirdParty,
-                    sitekey, specificOnly, filter)
+function logRequest(tabIds, request, filter)
 {
   if (filter)
     FilterNotifier.emit("filter.hitCount", filter, 0, 0, tabIds);
 
-  devtools.logRequest(
-    tabIds, url, type, docDomain,
-    thirdParty, sitekey,
-    specificOnly, filter
-  );
+  hitLoggerLogRequest(tabIds, request, filter);
 }
 
 browser.webRequest.onBeforeRequest.addListener(details =>
 {
   // Never block top-level documents.
   if (details.type == "main_frame")
     return;
 
   // Filter out requests from non web protocols. Ideally, we'd explicitly
   // specify the protocols we are interested in (i.e. http://, https://,
   // ws:// and wss://) with the url patterns, given below, when adding this
   // listener. But unfortunately, Chrome <=57 doesn't support the WebSocket
   // protocol and is causing an error if it is given.
   let url = new URL(details.url);
   if (url.protocol != "http:" && url.protocol != "https:" &&
       url.protocol != "ws:" && url.protocol != "wss:")
     return;
 
   // Firefox provides us with the full origin URL, while Chromium (>=63)
   // provides only the protocol + host of the (top-level) document which
   // the request originates from through the "initiator" property.
-  let originUrl = details.originUrl ? new URL(details.originUrl) :
-                  details.initiator ? new URL(details.initiator) : null;
+  let originUrl = null;
+  if (details.originUrl)
+    originUrl = new URL(details.originUrl);
+  else if (details.initiator && details.initiator != "null")
+    originUrl = new URL(details.initiator);
 
   // Ignore requests sent by extensions or by Firefox itself:
   // * Firefox intercepts requests sent by any extensions, indicated with
   //   an "originURL" starting with "moz-extension:".
   // * Chromium intercepts requests sent by this extension only, indicated
   //   on Chromium >=63 with an "initiator" starting with "chrome-extension:".
   // * On Firefox, requests that don't relate to any document or extension are
   //   indicated with an "originUrl" starting with "chrome:".
   if (originUrl && (originUrl.protocol == extensionProtocol ||
                     originUrl.protocol == "chrome:"))
     return;
 
   let page = new ext.Page({id: details.tabId});
   let frame = ext.getFrame(
     details.tabId,
     // We are looking for the frame that contains the element which
     // has triggered this request. For most requests (e.g. images) we
     // can just use the request's frame ID, but for subdocument requests
     // (e.g. iframes) we must instead use the request's parent frame ID.
     details.type == "sub_frame" ? details.parentFrameId : details.frameId
   );
 
   // On Chromium >= 63, if both the frame is unknown and we haven't get
-  // an "initator", this implies a request sent by the browser itself
-  // (on older versions of Chromium, due to the lack of "initator",
+  // an "initiator", this implies a request sent by the browser itself
+  // (on older versions of Chromium, due to the lack of "initiator",
   // this can also indicate a request sent by a Shared/Service Worker).
   if (!frame && !originUrl)
     return;
 
   if (checkWhitelisted(page, frame, originUrl))
     return;
 
   let type = resourceTypes.get(details.type) || "OTHER";
   let [docDomain, sitekey, specificOnly] = getDocumentInfo(page, frame,
                                                            originUrl);
-  let [filter, urlString, thirdParty] = matchRequest(url, type, docDomain,
-                                                     sitekey, specificOnly);
-
-  if (filter instanceof BlockingFilter && filter.rewrite)
-  {
-    let rewritten = filter.doRewrite(urlString);
-    if (rewritten && rewritten != urlString)
+  let [filter, thirdParty] = matchRequest(url, type, docDomain,
+                                          sitekey, specificOnly);
+
+  let result;
+  let rewrittenUrl;
+
+  if (filter instanceof BlockingFilter)
+  {
+    if (filter.rewrite)
     {
-      getRelatedTabIds(details).then(tabIds =>
+      rewrittenUrl = filter.rewriteUrl(details.url);
+      // If no rewrite happened (error, different origin), we'll
+      // return undefined in order to avoid an "infinite" loop.
+      if (rewrittenUrl != details.url)
+        result = {redirectUrl: rewrittenUrl};
+    }
+    else
+      result = {cancel: true};
+  }
+
+  getRelatedTabIds(details).then(tabIds =>
+  {
+    logRequest(
+      tabIds,
       {
-        logRequest(tabIds, urlString, "REWRITE", docDomain,
-                   thirdParty, sitekey, specificOnly, filter);
-      });
-
-      return {redirectUrl: rewritten};
-    }
-    // we couldn't do the rewrite, so just let it through.
-    return;
-  }
-
-  getRelatedTabIds(details).then(tabIds =>
-  {
-    logRequest(tabIds, urlString, type, docDomain,
-               thirdParty, sitekey, specificOnly, filter);
+        url: details.url, type, docDomain, thirdParty,
+        sitekey, specificOnly, rewrittenUrl
+      },
+      filter
+    );
   });
 
-  if (filter instanceof BlockingFilter)
-    return {cancel: true};
+  return result;
 }, {urls: ["<all_urls>"]}, ["blocking"]);
 
 port.on("filters.collapse", (message, sender) =>
 {
   let {page, frame} = sender;
 
   if (checkWhitelisted(page, frame))
     return false;
 
   let blocked = false;
@@ skipping 16 matching lines @@
   return blocked && Prefs.hidePlaceholders;
 });
 
 port.on("request.blockedByRTCWrapper", (msg, sender) =>
 {
   let {page, frame} = sender;
 
   if (checkWhitelisted(page, frame))
     return false;
 
+  let {url} = msg;
   let [docDomain, sitekey, specificOnly] = getDocumentInfo(page, frame);
-  let [filter, url, thirdParty] = matchRequest(new URL(msg.url),
-                                               "WEBRTC", docDomain,
-                                               sitekey, specificOnly);
-
-  logRequest([sender.page.id], url, "WEBRTC", docDomain,
-             thirdParty, sitekey, specificOnly, filter);
+  let [filter, thirdParty] = matchRequest(new URL(url), "WEBRTC", docDomain,
+                                          sitekey, specificOnly);
+  logRequest(
+    [sender.page.id],
+    {url, type: "WEBRTC", docDomain, thirdParty, sitekey, specificOnly},
+    filter
+  );
 
   return filter instanceof BlockingFilter;
 });
 
 let ignoreFilterNotifications = false;
 let handlerBehaviorChangedQuota =
   browser.webRequest.MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES;
 
 function propagateHandlerBehaviorChange()
 {
@@ skipping 51 matching lines @@
 }
 
 FilterNotifier.on("subscription.added", onFilterChange);
 FilterNotifier.on("subscription.removed", onFilterChange);
 FilterNotifier.on("subscription.updated", onFilterChange);
 FilterNotifier.on("subscription.disabled", arg => onFilterChange(arg, true));
 FilterNotifier.on("filter.added", onFilterChange);
 FilterNotifier.on("filter.removed", onFilterChange);
 FilterNotifier.on("filter.disabled", arg => onFilterChange(arg, true));
 FilterNotifier.on("load", onFilterChange);