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349 lines
11 KiB
JavaScript
349 lines
11 KiB
JavaScript
/*******************************************************************************
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µBlock - a browser extension to block requests.
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Copyright (C) 2014 The µBlock 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/uMatrix
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*/
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/* global Components */
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'use strict';
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/800#issuecomment-146580443
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this.EXPORTED_SYMBOLS = ['contentObserver', 'LocationChangeListener'];
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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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// Cu.import('resource://gre/modules/devtools/Console.jsm');
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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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var contentObserver = {
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classDescription: 'content-policy for ' + hostName,
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classID: Components.ID('{c84283d4-9975-41b7-b1a4-f106af56b51d}'),
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contractID: '@' + hostName + '/content-policy;1',
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ACCEPT: Ci.nsIContentPolicy.ACCEPT,
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MAIN_FRAME: Ci.nsIContentPolicy.TYPE_DOCUMENT,
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contentBaseURI: 'chrome://' + hostName + '/content/js/',
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cpMessageName: hostName + ':shouldLoad',
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uniqueSandboxId: 1,
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modernFirefox: Services.appinfo.ID === '{ec8030f7-c20a-464f-9b0e-13a3a9e97384}' &&
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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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if ( !this.modernFirefox ) {
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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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if ( !this.modernFirefox ) {
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this.componentRegistrar.unregisterFactory(
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this.classID,
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this
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);
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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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// https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIContentPolicy
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// https://bugzil.la/612921
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shouldLoad: function(type, location, origin, context) {
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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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var contextWindow;
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if ( type === this.MAIN_FRAME ) {
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contextWindow = context.contentWindow || context;
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} else if ( type === this.SUB_FRAME ) {
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contextWindow = context.contentWindow;
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} else {
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contextWindow = (context.ownerDocument || context).defaultView;
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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 ( !contextWindow.top || !contextWindow.location ) {
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return this.ACCEPT;
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}
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let messageManager = getMessageManager(contextWindow);
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if ( messageManager === null ) {
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return this.ACCEPT;
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}
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let details = {
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rawType: type,
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url: location.asciiSpec
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};
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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, details);
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} else {
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// Compatibility for older versions
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messageManager.sendSyncMessage(this.cpMessageName, details);
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}
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return this.ACCEPT;
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},
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initContentScripts: function(win, sandbox) {
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let messager = getMessageManager(win);
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let sandboxId = hostName + ':sb:' + this.uniqueSandboxId++;
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if ( sandbox ) {
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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.injectScript = function(script) {
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Services.scriptloader.loadSubScript(script, sandbox);
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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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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._messageListener_
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);
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};
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sandbox.removeMessageListener = function() {
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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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messager.removeMessageListener(
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hostName + ':broadcast',
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sandbox._messageListener_
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);
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} catch (ex) {
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// It throws sometimes, mostly when the popup closes
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}
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sandbox._messageListener_ = null;
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};
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return sandbox;
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},
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observe: function(doc) {
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let win = doc.defaultView;
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if ( !win ) {
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return;
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}
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let loc = win.location;
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if ( !loc ) {
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return;
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}
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// https://github.com/gorhill/uBlock/issues/260
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// TODO: We may have to skip more types, for now let's be
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// conservative, i.e. let's not test against `text/html`.
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if ( doc.contentType.lastIndexOf('image/', 0) === 0 ) {
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return;
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}
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if ( loc.protocol !== 'http:' && loc.protocol !== 'https:' && loc.protocol !== 'file:' ) {
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if ( loc.protocol === 'chrome:' && loc.host === hostName ) {
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this.initContentScripts(win);
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}
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// What about data: and about:blank?
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return;
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}
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let lss = Services.scriptloader.loadSubScript;
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let sandbox = this.initContentScripts(win, true);
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// Can throw with attempts at injecting into non-HTML document.
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// Example: https://a.pomf.se/avonjf.webm
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try {
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lss(this.contentBaseURI + 'vapi-client.js', sandbox);
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lss(this.contentBaseURI + 'contentscript-start.js', sandbox);
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} catch (ex) {
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return; // don't further try to inject anything
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}
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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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lss(this.contentBaseURI + 'contentscript-end.js', sandbox);
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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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};
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/******************************************************************************/
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const locationChangedMessageName = hostName + ':locationChanged';
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var LocationChangeListener = function(docShell) {
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if ( !docShell ) {
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return;
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}
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var requestor = docShell.QueryInterface(Ci.nsIInterfaceRequestor);
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var ds = requestor.getInterface(Ci.nsIWebProgress);
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var mm = requestor.getInterface(Ci.nsIContentFrameMessageManager);
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if ( ds && mm && typeof mm.sendAsyncMessage === 'function' ) {
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this.docShell = ds;
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this.messageManager = mm;
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ds.addProgressListener(this, Ci.nsIWebProgress.NOTIFY_LOCATION);
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}
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};
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LocationChangeListener.prototype.QueryInterface = XPCOMUtils.generateQI([
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'nsIWebProgressListener',
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'nsISupportsWeakReference'
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]);
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LocationChangeListener.prototype.onLocationChange = function(webProgress, request, location, flags) {
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if ( !webProgress.isTopLevel ) {
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return;
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}
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this.messageManager.sendAsyncMessage(locationChangedMessageName, {
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url: location.asciiSpec,
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flags: flags,
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});
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};
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/******************************************************************************/
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contentObserver.register();
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/******************************************************************************/
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