mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-02 00:42:45 +01:00
624 lines
22 KiB
JavaScript
624 lines
22 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-2017 The uBlock Origin authors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* exported processObserver */
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'use strict';
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/800
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this.EXPORTED_SYMBOLS = [
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'contentObserver',
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'processObserver',
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'LocationChangeListener'
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];
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const {interfaces: Ci, utils: Cu} = Components;
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const {Services} = Cu.import('resource://gre/modules/Services.jsm', null);
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const {XPCOMUtils} = Cu.import('resource://gre/modules/XPCOMUtils.jsm', null);
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const hostName = Services.io.newURI(Components.stack.filename, null, null).host;
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const rpcEmitterName = hostName + ':child-process-message';
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//Cu.import('resource://gre/modules/Console.jsm'); // Firefox >= 44
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//Cu.import('resource://gre/modules/devtools/Console.jsm'); // Firefox < 44
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/******************************************************************************/
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const getMessageManager = function(win) {
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let iface = win
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.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDocShell)
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.sameTypeRootTreeItem
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.QueryInterface(Ci.nsIDocShell)
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.QueryInterface(Ci.nsIInterfaceRequestor);
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try {
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return iface.getInterface(Ci.nsIContentFrameMessageManager);
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} catch (ex) {
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// This can throw. It appears `shouldLoad` can be called *after* a
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// tab has been closed. For example, a case where this happens all
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// the time (FF38):
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// - Open twitter.com (assuming you have an account and are logged in)
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// - Close twitter.com
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// There will be an exception raised when `shouldLoad` is called
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// to process a XMLHttpRequest with URL `https://twitter.com/i/jot`
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// fired from `https://twitter.com/`, *after* the tab is closed.
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// In such case, `win` is `about:blank`.
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}
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return null;
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};
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/2014
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// Have a dictionary of hostnames for which there are script tag filters. This
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// allow for coarse-testing before firing a synchronous message to the
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// parent process. Script tag filters are not very common, so this allows
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// to skip the blocking of the child process most of the time.
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var scriptTagFilterer = (function() {
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var scriptTagHostnames;
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var getCpmm = function() {
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var svc = Services;
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if ( !svc ) { return; }
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var cpmm = svc.cpmm;
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if ( cpmm ) { return cpmm; }
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cpmm = Components.classes['@mozilla.org/childprocessmessagemanager;1'];
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if ( cpmm ) { return cpmm.getService(Ci.nsISyncMessageSender); }
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};
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var getScriptTagHostnames = function() {
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if ( scriptTagHostnames ) {
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return scriptTagHostnames;
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}
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var cpmm = getCpmm();
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if ( !cpmm ) { return; }
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var r = cpmm.sendSyncMessage(rpcEmitterName, { fnName: 'getScriptTagHostnames' });
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if ( Array.isArray(r) && Array.isArray(r[0]) ) {
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scriptTagHostnames = new Set(r[0]);
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}
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return scriptTagHostnames;
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};
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var getScriptTagFilters = function(details) {
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let cpmm = getCpmm();
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if ( !cpmm ) { return; }
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let r = cpmm.sendSyncMessage(rpcEmitterName, {
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fnName: 'getScriptTagFilters',
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rootURL: details.rootURL,
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frameURL: details.frameURL,
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frameHostname: details.frameHostname
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});
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if ( Array.isArray(r) ) {
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return r[0];
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}
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};
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var regexFromHostname = function(details) {
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// If target hostname has no script tag filter, no point querying
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// chrome process.
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var hostnames = getScriptTagHostnames();
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if ( !hostnames ) { return; }
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var hn = details.frameHostname, pos, entity;
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for (;;) {
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if ( hostnames.has(hn) ) {
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return getScriptTagFilters(details);
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}
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pos = hn.indexOf('.');
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if ( pos === -1 ) { break; }
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entity = hn.slice(0, pos) + '.*';
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if ( hostnames.has(entity) ) {
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return getScriptTagFilters(details);
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}
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hn = hn.slice(pos + 1);
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if ( hn === '' ) { break; }
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}
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};
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var reset = function() {
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scriptTagHostnames = undefined;
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};
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return {
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get: regexFromHostname,
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reset: reset
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};
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})();
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/******************************************************************************/
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var contentObserver = {
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classDescription: 'content-policy for ' + hostName,
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classID: Components.ID('{7afbd130-cbaf-46c2-b944-f5d24305f484}'),
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contractID: '@' + hostName + '/content-policy;1',
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ACCEPT: Ci.nsIContentPolicy.ACCEPT,
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REJECT: Ci.nsIContentPolicy.REJECT_REQUEST,
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MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
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SUB_FRAME: Ci.nsIContentPolicy.TYPE_SUBDOCUMENT,
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contentBaseURI: 'chrome://' + hostName + '/content/js/',
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cpMessageName: hostName + ':shouldLoad',
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popupMessageName: hostName + ':shouldLoadPopup',
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ignoredPopups: new WeakMap(),
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uniquePopupEventId: 1,
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uniqueSandboxId: 1,
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modernFirefox: Services.vc.compare(Services.appinfo.platformVersion, '44') > 0,
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get componentRegistrar() {
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return Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
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},
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get categoryManager() {
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return Components.classes['@mozilla.org/categorymanager;1']
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.getService(Ci.nsICategoryManager);
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},
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QueryInterface: XPCOMUtils.generateQI([
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Ci.nsIFactory,
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Ci.nsIObserver,
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Ci.nsIContentPolicy,
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Ci.nsISupportsWeakReference
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]),
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createInstance: function(outer, iid) {
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if ( outer ) {
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throw Components.results.NS_ERROR_NO_AGGREGATION;
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}
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return this.QueryInterface(iid);
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},
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register: function() {
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Services.obs.addObserver(this, 'document-element-inserted', true);
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Services.obs.addObserver(this, 'content-document-global-created', true);
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// https://bugzilla.mozilla.org/show_bug.cgi?id=1232354
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// For modern versions of Firefox, the frameId/parentFrameId
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// information can be found in channel.loadInfo of the HTTP observer.
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if ( this.modernFirefox !== true ) {
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this.componentRegistrar.registerFactory(
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this.classID,
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this.classDescription,
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this.contractID,
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this
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);
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this.categoryManager.addCategoryEntry(
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'content-policy',
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this.contractID,
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this.contractID,
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false,
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true
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);
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}
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},
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unregister: function() {
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Services.obs.removeObserver(this, 'document-element-inserted');
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Services.obs.removeObserver(this, 'content-document-global-created');
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if ( this.modernFirefox !== true ) {
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this.componentRegistrar.unregisterFactory(this.classID, this);
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this.categoryManager.deleteCategoryEntry(
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'content-policy',
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this.contractID,
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false
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);
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}
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},
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getFrameId: function(win) {
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return win
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.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.outerWindowID;
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},
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// https://bugzil.la/612921
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shouldLoad: function(type, location, origin, context) {
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// For whatever reason, sometimes the global scope is completely
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// uninitialized at this point. Repro steps:
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// - Launch FF with uBlock enabled
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// - Disable uBlock
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// - Enable uBlock
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// - Services and all other global variables are undefined
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// Hopefully will eventually understand why this happens.
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if ( Services === undefined || !context ) {
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return this.ACCEPT;
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}
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if ( !location.schemeIs('http') && !location.schemeIs('https') ) {
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return this.ACCEPT;
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}
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if ( type === this.MAIN_FRAME ) {
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context = context.contentWindow || context;
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} else if ( type === this.SUB_FRAME ) {
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context = context.contentWindow;
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} else {
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context = (context.ownerDocument || context).defaultView;
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}
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// https://github.com/gorhill/uBlock/issues/1893
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// I don't know why this happens. I observed that when it occurred, the
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// resource was not seen by the HTTP observer, as if it was a spurious
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// call to shouldLoad().
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if ( !context ) {
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return this.ACCEPT;
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}
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// The context for the toolbar popup is an iframe element here,
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// so check context.top instead of context
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if ( !context.top || !context.location ) {
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return this.ACCEPT;
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}
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let messageManager = getMessageManager(context);
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if ( messageManager === null ) {
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return this.ACCEPT;
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}
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let isTopContext = context === context.top;
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var parentFrameId;
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if ( isTopContext ) {
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parentFrameId = -1;
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} else if ( context.parent === context.top ) {
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parentFrameId = 0;
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} else {
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parentFrameId = this.getFrameId(context.parent);
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}
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let rpcData = this.rpcData;
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rpcData.frameId = isTopContext ? 0 : this.getFrameId(context);
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rpcData.pFrameId = parentFrameId;
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rpcData.type = type;
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rpcData.url = location.spec;
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//console.log('shouldLoad: type=' + type + ' url=' + location.spec);
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if ( typeof messageManager.sendRpcMessage === 'function' ) {
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// https://bugzil.la/1092216
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messageManager.sendRpcMessage(this.cpMessageName, rpcData);
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} else {
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// Compatibility for older versions
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messageManager.sendSyncMessage(this.cpMessageName, rpcData);
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}
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return this.ACCEPT;
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},
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// Reuse object to avoid repeated memory allocation.
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rpcData: { frameId: 0, pFrameId: -1, type: 0, url: '' },
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initContentScripts: function(win, create) {
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let messager = getMessageManager(win);
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let sandboxId = hostName + ':sb:' + this.uniqueSandboxId++;
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let sandbox;
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if ( create ) {
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let sandboxName = [
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win.location.href.slice(0, 100),
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win.document.title.slice(0, 100)
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].join(' | ');
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// https://github.com/gorhill/uMatrix/issues/325
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// "Pass sameZoneAs to sandbox constructor to make GCs cheaper"
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sandbox = Cu.Sandbox([win], {
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sameZoneAs: win.top,
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sandboxName: sandboxId + '[' + sandboxName + ']',
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sandboxPrototype: win,
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wantComponents: false,
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wantXHRConstructor: false
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});
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sandbox.getScriptTagFilters = function(details) {
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return scriptTagFilterer.get(details);
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};
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sandbox.injectScript = function(script) {
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let svc = Services;
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// Sandbox appears void.
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// I've seen this happens, need to investigate why.
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if ( svc === undefined ) { return; }
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svc.scriptloader.loadSubScript(script, sandbox);
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};
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let canUserStyles = (function() {
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try {
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return win.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils)
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.loadSheetUsingURIString instanceof Function;
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} catch(ex) {
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}
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return false;
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})();
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if ( canUserStyles ) {
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sandbox.injectCSS = function(sheetURI) {
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try {
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let wu = win.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils);
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wu.loadSheetUsingURIString(sheetURI, wu.USER_SHEET);
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} catch(ex) {
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}
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};
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sandbox.removeCSS = function(sheetURI) {
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try {
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let wu = win.QueryInterface(Ci.nsIInterfaceRequestor)
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.getInterface(Ci.nsIDOMWindowUtils);
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wu.removeSheetUsingURIString(sheetURI, wu.USER_SHEET);
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} catch (ex) {
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}
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};
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}
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sandbox.topContentScript = win === win.top;
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// https://developer.mozilla.org/en-US/Firefox/Multiprocess_Firefox/Message_Manager/Frame_script_loading_and_lifetime#Unloading_frame_scripts
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// The goal is to have content scripts removed from web pages. This
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// helps remove traces of uBlock from memory when disabling/removing
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// the addon.
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// For example, this takes care of:
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// https://github.com/gorhill/uBlock/commit/ea4faff383789053f423498c1f1165c403fde7c7#commitcomment-11964137
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// > "gets the whole selected tab flashing"
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sandbox.outerShutdown = function() {
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sandbox.removeMessageListener();
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sandbox.addMessageListener =
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sandbox.getScriptTagFilters =
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sandbox.injectCSS =
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sandbox.injectScript =
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sandbox.outerShutdown =
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sandbox.removeCSS =
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sandbox.removeMessageListener =
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sandbox.sendAsyncMessage = function(){};
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sandbox.vAPI = {};
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messager = null;
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};
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}
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else {
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sandbox = win;
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}
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sandbox._sandboxId_ = sandboxId;
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sandbox.sendAsyncMessage = messager.sendAsyncMessage;
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sandbox.addMessageListener = function(callback) {
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if ( sandbox._messageListener_ ) {
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sandbox.removeMessageListener();
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}
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sandbox._messageListener_ = function(message) {
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callback(message.data);
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};
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sandbox._broadcastListener_ = function(message) {
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// https://github.com/gorhill/uBlock/issues/2014
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if ( sandbox.topContentScript ) {
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let details;
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try { details = JSON.parse(message.data); } catch (ex) {}
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let msg = details && details.msg || {};
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if ( msg.what === 'staticFilteringDataChanged' ) {
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if ( scriptTagFilterer ) {
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scriptTagFilterer.reset();
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}
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}
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}
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callback(message.data);
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};
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messager.addMessageListener(
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sandbox._sandboxId_,
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sandbox._messageListener_
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);
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messager.addMessageListener(
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hostName + ':broadcast',
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sandbox._broadcastListener_
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);
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};
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sandbox.removeMessageListener = function() {
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if ( !sandbox._messageListener_ ) {
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return;
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}
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// It throws sometimes, mostly when the popup closes
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try {
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messager.removeMessageListener(
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sandbox._sandboxId_,
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sandbox._messageListener_
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);
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} catch (ex) {
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}
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try {
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messager.removeMessageListener(
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hostName + ':broadcast',
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sandbox._broadcastListener_
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);
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} catch (ex) {
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}
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sandbox._messageListener_ = sandbox._broadcastListener_ = null;
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};
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return sandbox;
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},
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injectOtherContentScripts: function(doc, sandbox) {
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let docReady = (e) => {
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let doc = e.target;
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doc.removeEventListener(e.type, docReady, true);
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if ( doc.querySelector('a[href^="abp:"],a[href^="https://subscribe.adblockplus.org/?"]') ) {
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Services.scriptloader.loadSubScript(this.contentBaseURI + 'scriptlets/subscriber.js', sandbox);
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}
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};
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if ( doc.readyState === 'loading') {
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doc.addEventListener('DOMContentLoaded', docReady, true);
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} else {
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docReady({ target: doc, type: 'DOMContentLoaded' });
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}
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},
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ignorePopup: function(e) {
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if ( e.isTrusted === false ) { return; }
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let contObs = contentObserver;
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contObs.ignoredPopups.set(this, true);
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this.removeEventListener('keydown', contObs.ignorePopup, true);
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this.removeEventListener('mousedown', contObs.ignorePopup, true);
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},
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lookupPopupOpener: function(popup) {
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for (;;) {
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let opener = popup.opener;
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if ( !opener ) { return; }
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if ( opener.top ) { opener = opener.top; }
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if ( opener === popup ) { return; }
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if ( !opener.location ) { return; }
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if ( this.reValidPopups.test(opener.location.protocol) ) {
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return opener;
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}
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// https://github.com/uBlockOrigin/uAssets/issues/255
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// - Mind chained about:blank popups.
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if ( opener.location.href !== 'about:blank' ) { return; }
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popup = opener;
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}
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},
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reValidPopups: /^(?:blob|data|https?|javascript):/,
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reMustInjectScript: /^(?:file|https?):/,
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observe: function(subject, topic) {
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// For whatever reason, sometimes the global scope is completely
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// uninitialized at this point. Repro steps:
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// - Launch FF with uBlock enabled
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// - Disable uBlock
|
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// - Enable uBlock
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// - Services and all other global variables are undefined
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// Hopefully will eventually understand why this happens.
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if ( Services === undefined ) { return; }
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// https://github.com/gorhill/uBlock/issues/2290
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if ( topic === 'content-document-global-created' ) {
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if ( subject !== subject.top || !subject.opener ) { return; }
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if ( this.ignoredPopups.has(subject) ) { return; }
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let opener = this.lookupPopupOpener(subject);
|
|
if ( !opener ) { return; }
|
|
subject.addEventListener('keydown', this.ignorePopup, true);
|
|
subject.addEventListener('mousedown', this.ignorePopup, true);
|
|
let popupMessager = getMessageManager(subject);
|
|
if ( !popupMessager ) { return; }
|
|
let openerMessager = getMessageManager(opener);
|
|
if ( !openerMessager ) { return; }
|
|
popupMessager.sendAsyncMessage(this.popupMessageName, {
|
|
id: this.uniquePopupEventId,
|
|
popup: true
|
|
});
|
|
openerMessager.sendAsyncMessage(this.popupMessageName, {
|
|
id: this.uniquePopupEventId,
|
|
opener: true
|
|
});
|
|
this.uniquePopupEventId += 1;
|
|
return;
|
|
}
|
|
|
|
// topic === 'document-element-inserted'
|
|
|
|
let doc = subject;
|
|
let win = doc.defaultView || null;
|
|
if ( win === null ) { return; }
|
|
|
|
// https://github.com/gorhill/uBlock/issues/260
|
|
// https://developer.mozilla.org/en-US/docs/Web/API/Document/contentType
|
|
// "Non-standard, only supported by Gecko. To be used in
|
|
// "chrome code (i.e. Extensions and XUL applications)."
|
|
// TODO: We may have to exclude more types, for now let's be
|
|
// conservative and focus only on the one issue reported, i.e. let's
|
|
// not test against 'text/html'.
|
|
if ( doc.contentType.startsWith('image/') ) { return; }
|
|
|
|
let loc = win.location;
|
|
if ( this.reMustInjectScript.test(loc.protocol) === false ) {
|
|
if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
|
|
this.initContentScripts(win);
|
|
}
|
|
// What about data: and about:blank?
|
|
return;
|
|
}
|
|
|
|
// Content scripts injection.
|
|
let lss = Services.scriptloader.loadSubScript;
|
|
let sandbox = this.initContentScripts(win, true);
|
|
try {
|
|
lss(this.contentBaseURI + 'vapi-client.js', sandbox);
|
|
lss(this.contentBaseURI + 'contentscript.js', sandbox);
|
|
} catch (ex) {
|
|
//console.exception(ex.msg, ex.stack);
|
|
return;
|
|
}
|
|
// The remaining scripts are worth injecting only on a top-level window
|
|
// and at document_idle time.
|
|
if ( win === win.top ) {
|
|
this.injectOtherContentScripts(doc, sandbox);
|
|
}
|
|
}
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
var processObserver = {
|
|
start: function() {
|
|
scriptTagFilterer.reset();
|
|
}
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
var LocationChangeListener = function(docShell, webProgress) {
|
|
var mm = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
|
|
.getInterface(Ci.nsIContentFrameMessageManager);
|
|
if ( !mm || typeof mm.sendAsyncMessage !== 'function' ) {
|
|
return;
|
|
}
|
|
this.messageManager = mm;
|
|
webProgress.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
|
|
};
|
|
|
|
LocationChangeListener.prototype.messageName = hostName + ':locationChanged';
|
|
|
|
LocationChangeListener.prototype.QueryInterface = XPCOMUtils.generateQI([
|
|
'nsIWebProgressListener',
|
|
'nsISupportsWeakReference'
|
|
]);
|
|
|
|
LocationChangeListener.prototype.onLocationChange = function(webProgress, request, location, flags) {
|
|
if ( !webProgress.isTopLevel ) {
|
|
return;
|
|
}
|
|
this.messageManager.sendAsyncMessage(this.messageName, {
|
|
url: location.asciiSpec,
|
|
flags: flags
|
|
});
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
contentObserver.register();
|
|
|
|
/******************************************************************************/
|