mirror of https://github.com/gorhill/uBlock.git
770 lines
25 KiB
JavaScript
770 lines
25 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium browser extension to block requests.
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Copyright (C) 2014 Raymond Hill
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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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/* global chrome */
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// Injected into content pages
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/******************************************************************************/
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/******************************************************************************/
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// https://github.com/gorhill/httpswitchboard/issues/345
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var uBlockMessaging = (function(name){
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var port = null;
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var requestId = 1;
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var requestIdToCallbackMap = {};
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var listenCallback = null;
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var onPortMessage = function(details) {
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if ( typeof details.id !== 'number' ) {
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return;
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}
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// Announcement?
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if ( details.id < 0 ) {
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if ( listenCallback ) {
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listenCallback(details.msg);
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}
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return;
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}
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var callback = requestIdToCallbackMap[details.id];
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if ( !callback ) {
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return;
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}
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// Must be removed before calling client to be sure to not execute
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// callback again if the client stops the messaging service.
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delete requestIdToCallbackMap[details.id];
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callback(details.msg);
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};
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var start = function(name) {
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port = chrome.runtime.connect({ name: name });
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port.onMessage.addListener(onPortMessage);
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// https://github.com/gorhill/uBlock/issues/193
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port.onDisconnect.addListener(stop);
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};
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var stop = function() {
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listenCallback = null;
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port.disconnect();
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port = null;
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flushCallbacks();
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};
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if ( typeof name === 'string' && name !== '' ) {
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start(name);
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}
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var ask = function(msg, callback) {
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if ( port === null ) {
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if ( typeof callback === 'function' ) {
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callback();
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}
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return;
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}
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if ( callback === undefined ) {
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tell(msg);
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return;
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}
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var id = requestId++;
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port.postMessage({ id: id, msg: msg });
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requestIdToCallbackMap[id] = callback;
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};
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var tell = function(msg) {
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if ( port !== null ) {
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port.postMessage({ id: 0, msg: msg });
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}
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};
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var listen = function(callback) {
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listenCallback = callback;
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};
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var flushCallbacks = function() {
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var callback;
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for ( var id in requestIdToCallbackMap ) {
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if ( requestIdToCallbackMap.hasOwnProperty(id) === false ) {
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continue;
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}
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callback = requestIdToCallbackMap[id];
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if ( !callback ) {
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continue;
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}
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// Must be removed before calling client to be sure to not execute
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// callback again if the client stops the messaging service.
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delete requestIdToCallbackMap[id];
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callback();
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}
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};
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return {
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start: start,
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stop: stop,
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ask: ask,
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tell: tell,
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listen: listen
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};
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})('contentscript-end.js');
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/******************************************************************************/
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/******************************************************************************/
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// ABP cosmetic filters
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(function() {
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var messaging = uBlockMessaging;
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var queriedSelectors = {};
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var injectedSelectors = {};
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var classSelectors = null;
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var idSelectors = null;
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var highGenerics = null;
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var contextNodes = [document];
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var nullArray = { push: function(){} };
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var domLoaded = function() {
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var style = document.getElementById('ublock-preload-1ae7a5f130fc79b4fdb8a4272d9426b5');
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if ( style ) {
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// https://github.com/gorhill/uBlock/issues/14
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// Treat any existing domain-specific exception selectors as if
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// they had been injected already.
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var selectors, i;
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var exceptions = style.getAttribute('data-ublock-exceptions');
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if ( exceptions ) {
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selectors = JSON.parse(exceptions);
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i = selectors.length;
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while ( i-- ) {
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injectedSelectors[selectors[i]] = true;
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}
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}
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// Avoid re-injecting already injected CSS rules.
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selectors = selectorsFromStyles(style);
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i = selectors.length;
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while ( i-- ) {
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injectedSelectors[selectors[i]] = true;
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}
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// https://github.com/gorhill/uBlock/issues/158
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// Ensure injected styles are enforced
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hideElements(selectors.join(','));
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}
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idsFromNodeList(document.querySelectorAll('[id]'));
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classesFromNodeList(document.querySelectorAll('[class]'));
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retrieveGenericSelectors();
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};
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var selectorsFromStyles = function(styleRef) {
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var selectors = [];
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var styles = typeof styleRef === 'string' ?
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document.querySelectorAll(styleRef):
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[styleRef];
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var i = styles.length;
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var style, subset, lastSelector, pos;
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while ( i-- ) {
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style = styles[i];
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subset = style.textContent.split(',\n');
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lastSelector = subset.pop();
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if ( lastSelector ) {
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pos = lastSelector.indexOf('\n');
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if ( pos !== -1 ) {
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subset.push(lastSelector.slice(0, pos));
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}
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}
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selectors = selectors.concat(subset);
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}
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return selectors;
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};
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var retrieveGenericSelectors = function() {
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var selectors = classSelectors !== null ? Object.keys(classSelectors) : [];
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if ( idSelectors !== null ) {
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selectors = selectors.concat(idSelectors);
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}
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if ( selectors.length > 0 || highGenerics === null ) {
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//console.log('µBlock> ABP cosmetic filters: retrieving CSS rules using %d selectors', selectors.length);
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messaging.ask({
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what: 'retrieveGenericCosmeticSelectors',
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pageURL: window.location.href,
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selectors: selectors,
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highGenerics: highGenerics === null
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},
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retrieveHandler
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);
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} else {
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retrieveHandler(null);
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}
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idSelectors = null;
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classSelectors = null;
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};
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var retrieveHandler = function(selectors) {
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//console.debug('µBlock> contextNodes = %o', contextNodes);
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if ( selectors && selectors.highGenerics ) {
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highGenerics = selectors.highGenerics;
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}
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if ( selectors && selectors.donthide.length ) {
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processLowGenerics(selectors.donthide, nullArray);
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}
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if ( highGenerics ) {
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if ( highGenerics.donthideLowCount ) {
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processHighLowGenerics(highGenerics.donthideLow, nullArray);
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}
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if ( highGenerics.donthideMediumCount ) {
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processHighMediumGenerics(highGenerics.donthideMedium, nullArray);
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}
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}
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// No such thing as high-high generic exceptions.
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//if ( highGenerics.donthideHighCount ) {
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// processHighHighGenerics(document, highGenerics.donthideHigh, nullArray);
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//}
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var hideSelectors = [];
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if ( selectors && selectors.hide.length ) {
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processLowGenerics(selectors.hide, hideSelectors);
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}
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if ( highGenerics ) {
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if ( highGenerics.hideLowCount ) {
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processHighLowGenerics(highGenerics.hideLow, hideSelectors);
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}
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if ( highGenerics.hideMediumCount ) {
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processHighMediumGenerics(highGenerics.hideMedium, hideSelectors);
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}
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if ( highGenerics.hideHighCount ) {
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processHighHighGenericsAsync();
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}
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}
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if ( hideSelectors.length ) {
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addStyleTag(hideSelectors);
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}
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contextNodes.length = 0;
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};
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// Ensure elements matching a set of selectors are visually removed
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// from the page, by:
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// - Modifying the style property on the elements themselves
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// - Injecting a style tag
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var addStyleTag = function(selectors) {
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hideElements(selectors);
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var style = document.createElement('style');
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style.setAttribute('class', 'ublock-postload-1ae7a5f130fc79b4fdb8a4272d9426b5');
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// The linefeed before the style block is very important: do no remove!
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style.appendChild(document.createTextNode(selectors.join(',\n') + '\n{display:none !important;}'));
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var parent = document.body || document.documentElement;
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if ( parent ) {
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parent.appendChild(style);
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}
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messaging.tell({
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what: 'injectedSelectors',
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type: 'cosmetic',
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hostname: window.location.hostname,
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selectors: selectors
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});
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//console.debug('µBlock> generic cosmetic filters: injecting %d CSS rules:', selectors.length, text);
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};
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var hideElements = function(selectors) {
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// https://github.com/gorhill/uBlock/issues/207
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// Do not call querySelectorAll() using invalid CSS selectors
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if ( selectors.length === 0 ) {
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return;
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}
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if ( document.body === null ) {
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return;
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}
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// https://github.com/gorhill/uBlock/issues/158
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// Using CSSStyleDeclaration.setProperty is more reliable
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var elems = document.querySelectorAll(selectors);
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var i = elems.length;
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while ( i-- ) {
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elems[i].style.setProperty('display', 'none', 'important');
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}
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};
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// Extract and return the staged nodes which (may) match the selectors.
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var selectNodes = function(selector) {
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var targetNodes = [];
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var i = contextNodes.length;
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var node, nodeList, j;
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var doc = document;
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while ( i-- ) {
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node = contextNodes[i];
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if ( node === doc ) {
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return doc.querySelectorAll(selector);
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}
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targetNodes.push(node);
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nodeList = node.querySelectorAll(selector);
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j = nodeList.length;
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while ( j-- ) {
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targetNodes.push(nodeList[j]);
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}
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}
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return targetNodes;
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};
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// Low generics:
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// - [id]
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// - [class]
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var processLowGenerics = function(generics, out) {
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var i = generics.length;
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var selector;
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while ( i-- ) {
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selector = generics[i];
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if ( injectedSelectors[selector] !== undefined ) {
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continue;
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}
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injectedSelectors[selector] = true;
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out.push(selector);
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}
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};
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// High-low generics:
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// - [alt="..."]
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// - [title="..."]
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var processHighLowGenerics = function(generics, out) {
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var attrs = ['title', 'alt'];
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var attr, attrValue, nodeList, iNode, node;
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var selector;
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while ( attr = attrs.pop() ) {
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nodeList = selectNodes('[' + attr + ']');
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iNode = nodeList.length;
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while ( iNode-- ) {
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node = nodeList[iNode];
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attrValue = node.getAttribute(attr);
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if ( !attrValue ) { continue; }
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selector = '[' + attr + '="' + attrValue + '"]';
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if ( generics[selector] ) {
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if ( injectedSelectors[selector] === undefined ) {
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injectedSelectors[selector] = true;
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out.push(selector);
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}
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}
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selector = node.tagName.toLowerCase() + selector;
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if ( generics[selector] ) {
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if ( injectedSelectors[selector] === undefined ) {
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injectedSelectors[selector] = true;
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out.push(selector);
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}
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}
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}
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}
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};
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// High-medium generics:
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// - [href^="http"]
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var processHighMediumGenerics = function(generics, out) {
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var nodeList = selectNodes('a[href^="http"]');
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var iNode = nodeList.length;
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var node, href, pos, hash, selectors, selector, iSelector;
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while ( iNode-- ) {
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node = nodeList[iNode];
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href = node.getAttribute('href');
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if ( !href ) { continue; }
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pos = href.indexOf('://');
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if ( pos === -1 ) { continue; }
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hash = href.slice(pos + 3, pos + 11);
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selectors = generics[hash];
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if ( selectors === undefined ) { continue; }
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selectors = selectors.split(',\n');
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iSelector = selectors.length;
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while ( iSelector-- ) {
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selector = selectors[iSelector];
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if ( injectedSelectors[selector] === undefined ) {
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injectedSelectors[selector] = true;
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out.push(selector);
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}
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}
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}
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};
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// High-high generics are *very costly* to process, so we will coalesce
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// requests to process high-high generics into as few requests as possible.
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// The gain is *significant* on bloated pages.
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var processHighHighGenericsTimer = null;
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var processHighHighGenerics = function() {
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processHighHighGenericsTimer = null;
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if ( injectedSelectors['{{highHighGenerics}}'] !== undefined ) { return; }
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if ( document.querySelector(highGenerics.hideHigh) === null ) { return; }
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injectedSelectors['{{highHighGenerics}}'] = true;
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// We need to filter out possible exception cosmetic filters from
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// high-high generics selectors.
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var selectors = highGenerics.hideHigh.split(',\n');
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var i = selectors.length;
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var selector;
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while ( i-- ) {
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selector = selectors[i];
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if ( injectedSelectors.hasOwnProperty(selector) ) {
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selectors.splice(i, 1);
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} else {
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injectedSelectors[selector] = true;
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}
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}
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if ( selectors.length !== 0 ) {
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addStyleTag(selectors);
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}
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};
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var processHighHighGenericsAsync = function() {
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if ( processHighHighGenericsTimer !== null ) {
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clearTimeout(processHighHighGenericsTimer);
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}
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processHighHighGenericsTimer = setTimeout(processHighHighGenerics, 300);
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};
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// Extract all ids: these will be passed to the cosmetic filtering
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// engine, and in return we will obtain only the relevant CSS selectors.
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var idsFromNodeList = function(nodes) {
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if ( !nodes || !nodes.length ) {
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return;
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}
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if ( idSelectors === null ) {
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idSelectors = [];
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}
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var qq = queriedSelectors;
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var ii = idSelectors;
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var node, v;
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var i = nodes.length;
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while ( i-- ) {
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node = nodes[i];
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if ( node.nodeType !== 1 ) { continue; }
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// id
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v = nodes[i].id;
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if ( typeof v !== 'string' ) { continue; }
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v = v.trim();
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if ( v === '' ) { continue; }
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v = '#' + v;
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if ( qq[v] ) { continue; }
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ii.push(v);
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qq[v] = true;
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}
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};
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// Extract all classes: these will be passed to the cosmetic filtering
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// engine, and in return we will obtain only the relevant CSS selectors.
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var classesFromNodeList = function(nodes) {
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if ( !nodes || !nodes.length ) {
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return;
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}
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if ( classSelectors === null ) {
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classSelectors = {};
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}
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var qq = queriedSelectors;
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var cc = classSelectors;
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var node, v, vv, j;
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var i = nodes.length;
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while ( i-- ) {
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node = nodes[i];
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if ( node.nodeType !== 1 ) { continue; }
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// class
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v = nodes[i].className;
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// it could be an SVGAnimatedString...
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if ( typeof v !== 'string' ) { continue; }
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v = v.trim();
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if ( v === '' ) { continue; }
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// one class
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if ( v.indexOf(' ') < 0 ) {
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v = '.' + v;
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if ( qq[v] ) { continue; }
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cc[v] = true;
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qq[v] = true;
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continue;
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}
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// many classes
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vv = v.trim().split(' ');
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j = vv.length;
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while ( j-- ) {
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v = vv[j].trim();
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if ( v === '' ) { continue; }
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v = '.' + v;
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if ( qq[v] ) { continue; }
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cc[v] = true;
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qq[v] = true;
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}
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}
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};
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// Start cosmetic filtering.
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domLoaded();
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// Below this point is the code which takes care to observe changes in
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// the page and to add if needed relevant CSS rules as a result of the
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// changes.
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// Observe changes in the DOM only if...
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// - there is a document.body
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// - there is at least one `script` tag
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if ( !document.body || !document.querySelector('script') ) {
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return;
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}
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var ignoreTags = {
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'link': true,
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'LINK': true,
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'script': true,
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'SCRIPT': true,
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'style': true,
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'STYLE': true
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};
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// Added node lists will be cumulated here before being processed
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var addedNodeLists = [];
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var addedNodeListsTimer = null;
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var mutationObservedHandler = function() {
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var nodeList, iNode, node;
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while ( nodeList = addedNodeLists.pop() ) {
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iNode = nodeList.length;
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while ( iNode-- ) {
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node = nodeList[iNode];
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if ( typeof node.querySelectorAll !== 'function' ) {
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continue;
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}
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if ( ignoreTags.hasOwnProperty(node.tagName) ) {
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continue;
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}
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contextNodes.push(node);
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}
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}
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addedNodeListsTimer = null;
|
|
if ( contextNodes.length !== 0 ) {
|
|
idsFromNodeList(selectNodes('[id]'));
|
|
classesFromNodeList(selectNodes('[class]'));
|
|
retrieveGenericSelectors();
|
|
}
|
|
};
|
|
|
|
// https://github.com/gorhill/uBlock/issues/205
|
|
// Do not handle added node directly from within mutation observer.
|
|
var mutationObservedHandlerAsync = function(mutations) {
|
|
var iMutation = mutations.length;
|
|
var nodeList;
|
|
while ( iMutation-- ) {
|
|
if ( nodeList = mutations[iMutation].addedNodes ) {
|
|
addedNodeLists.push(nodeList);
|
|
}
|
|
}
|
|
if ( addedNodeListsTimer === null ) {
|
|
// I arbitrarily chose 50 ms for now:
|
|
// I have to compromise between the overhead of processing too few
|
|
// nodes too often and the delay of many nodes less often.
|
|
addedNodeListsTimer = setTimeout(mutationObservedHandler, 50);
|
|
}
|
|
};
|
|
|
|
// https://github.com/gorhill/httpswitchboard/issues/176
|
|
var observer = new MutationObserver(mutationObservedHandlerAsync);
|
|
observer.observe(document.body, {
|
|
attributes: false,
|
|
childList: true,
|
|
characterData: false,
|
|
subtree: true
|
|
});
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
/******************************************************************************/
|
|
|
|
// Permanent
|
|
|
|
(function() {
|
|
var messaging = uBlockMessaging;
|
|
|
|
// Listeners to mop up whatever is otherwise missed:
|
|
// - Future requests not blocked yet
|
|
// - Elements dynamically added to the page
|
|
// - Elements which resource URL changes
|
|
|
|
var loadedElements = {
|
|
'iframe': 'src'
|
|
};
|
|
|
|
var failedElements = {
|
|
'img': 'src',
|
|
'input': 'src',
|
|
'object': 'data'
|
|
};
|
|
|
|
var onResource = function(target, dict) {
|
|
if ( !target ) {
|
|
return;
|
|
}
|
|
var tagName = target.tagName.toLowerCase();
|
|
var prop = dict[tagName];
|
|
if ( prop === undefined ) {
|
|
return;
|
|
}
|
|
var src = target[prop];
|
|
if ( typeof src !== 'string' || src === '' ) {
|
|
return;
|
|
}
|
|
if ( src.slice(0, 4) !== 'http' ) {
|
|
return;
|
|
}
|
|
|
|
// https://github.com/gorhill/uBlock/issues/174
|
|
// Do not remove fragment from src URL
|
|
|
|
var onAnswerReceived = function(details) {
|
|
if ( typeof details !== 'object' || details === null ) {
|
|
return;
|
|
}
|
|
// If `!important` is not there, going back using history will
|
|
// likely cause the hidden element to re-appear.
|
|
if ( details.collapse ) {
|
|
if ( target.parentNode ) {
|
|
target.parentNode.removeChild(target);
|
|
} else {
|
|
target.style.setProperty('display', 'none', 'important');
|
|
}
|
|
} else {
|
|
target.style.setProperty('visibility', 'hidden', 'important');
|
|
}
|
|
messaging.tell({
|
|
what: 'injectedSelectors',
|
|
type: 'net',
|
|
hostname: window.location.hostname,
|
|
selectors: tagName + '[' + prop + '="' + src + '"]'
|
|
});
|
|
};
|
|
|
|
var details = {
|
|
what: 'filterRequest',
|
|
tagName: tagName,
|
|
requestURL: src,
|
|
pageHostname: window.location.hostname,
|
|
pageURL: window.location.href
|
|
};
|
|
messaging.ask(details, onAnswerReceived);
|
|
};
|
|
|
|
var onResourceLoaded = function(ev) {
|
|
//console.debug('Loaded %s[src="%s"]', ev.target.tagName, ev.target.src);
|
|
onResource(ev.target, loadedElements);
|
|
};
|
|
|
|
var onResourceFailed = function(ev) {
|
|
//console.debug('Failed to load %s[src="%s"]', ev.target.tagName, ev.target.src);
|
|
onResource(ev.target, failedElements);
|
|
};
|
|
|
|
document.addEventListener('load', onResourceLoaded, true);
|
|
document.addEventListener('error', onResourceFailed, true);
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
/******************************************************************************/
|
|
|
|
// https://github.com/gorhill/uBlock/issues/7
|
|
|
|
// Executed only once
|
|
|
|
(function() {
|
|
var messaging = uBlockMessaging;
|
|
|
|
var srcProps = {
|
|
'embed': 'src',
|
|
'iframe': 'src',
|
|
'img': 'src',
|
|
'object': 'data'
|
|
};
|
|
var elements = [];
|
|
|
|
var onAnswerReceived = function(details) {
|
|
if ( typeof details !== 'object' || details === null ) {
|
|
return;
|
|
}
|
|
var requests = details.requests;
|
|
var collapse = details.collapse;
|
|
var selectors = [];
|
|
var i = requests.length;
|
|
var request, elem;
|
|
while ( i-- ) {
|
|
request = requests[i];
|
|
elem = elements[request.index];
|
|
if ( collapse ) {
|
|
if ( elem.parentNode ) {
|
|
elem.parentNode.removeChild(elem);
|
|
} else {
|
|
elem.style.setProperty('display', 'none', 'important');
|
|
}
|
|
} else {
|
|
elem.style.setProperty('visibility', 'hidden', 'important');
|
|
}
|
|
selectors.push(request.tagName + '[' + srcProps[request.tagName] + '="' + request.url + '"]');
|
|
}
|
|
if ( selectors.length !== 0 ) {
|
|
messaging.tell({
|
|
what: 'injectedSelectors',
|
|
type: 'net',
|
|
hostname: window.location.hostname,
|
|
selectors: selectors
|
|
});
|
|
}
|
|
};
|
|
|
|
var requests = [];
|
|
var tagNames = ['embed','iframe','img','object'];
|
|
var elementIndex = 0;
|
|
var tagName, elems, i, elem, prop, src;
|
|
while ( tagName = tagNames.pop() ) {
|
|
elems = document.getElementsByTagName(tagName);
|
|
i = elems.length;
|
|
while ( i-- ) {
|
|
elem = elems[i];
|
|
prop = srcProps[tagName];
|
|
if ( prop === undefined ) {
|
|
continue;
|
|
}
|
|
src = elem[prop];
|
|
if ( typeof src !== 'string' || src === '' ) {
|
|
continue;
|
|
}
|
|
if ( src.slice(0, 4) !== 'http' ) {
|
|
continue;
|
|
}
|
|
requests.push({
|
|
index: elementIndex,
|
|
tagName: tagName,
|
|
url: src
|
|
});
|
|
elements[elementIndex] = elem;
|
|
elementIndex += 1;
|
|
}
|
|
}
|
|
var details = {
|
|
what: 'filterRequests',
|
|
pageURL: window.location.href,
|
|
pageHostname: window.location.hostname,
|
|
requests: requests
|
|
};
|
|
messaging.ask(details, onAnswerReceived);
|
|
})();
|
|
|
|
/******************************************************************************/
|