mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-15 07:22:28 +02:00
526 lines
17 KiB
JavaScript
526 lines
17 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 dangling = false;
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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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callback(details.msg);
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delete requestIdToCallbackMap[details.id];
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checkDisconnect();
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};
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var start = function(name) {
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port = chrome.runtime.connect({
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name: name +
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'/' +
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String.fromCharCode(
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Math.random() * 0x7FFF | 0,
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Math.random() * 0x7FFF | 0,
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Math.random() * 0x7FFF | 0,
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Math.random() * 0x7FFF | 0
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)
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});
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port.onMessage.addListener(onPortMessage);
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};
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if ( typeof name === 'string' && name.length > 0 ) {
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start(name);
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}
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var stop = function() {
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listenCallback = null;
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dangling = true;
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checkDisconnect();
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};
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var ask = function(msg, callback) {
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if ( !callback ) {
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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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port.postMessage({ id: 0, msg: msg });
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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 checkDisconnect = function() {
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if ( !dangling ) {
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return;
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}
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if ( Object.keys(requestIdToCallbackMap).length ) {
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return;
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}
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port.disconnect();
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port = null;
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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 domLoaded = function() {
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// https://github.com/gorhill/uBlock/issues/14
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// Treat any existing domain-specific exception selectors as if they had
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// been injected already.
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var style = document.getElementById('uBlock1ae7a5f130fc79b4fdb8a4272d9426b5');
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var exceptions = style && style.getAttribute('uBlock1ae7a5f130fc79b4fdb8a4272d9426b5');
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if ( exceptions ) {
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exceptions = JSON.parse(exceptions);
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var i = exceptions.length;
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while ( i-- ) {
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injectedSelectors[exceptions[i]] = true;
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}
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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 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);
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}
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if ( highGenerics ) {
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if ( highGenerics.donthideLowCount ) {
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processHighLowGenerics(highGenerics.donthideLow);
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}
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if ( highGenerics.donthideMediumCount ) {
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processHighMediumGenerics(highGenerics.donthideMedium);
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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);
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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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processHighHighGenerics(highGenerics.hideHigh, hideSelectors);
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}
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}
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if ( hideSelectors.length ) {
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applyCSS(hideSelectors, 'display', 'none');
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var style = document.createElement('style');
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var text = hideSelectors.join(',\n') + ' {display:none !important;}';
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style.appendChild(document.createTextNode(text));
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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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//console.debug('µBlock> generic cosmetic filters: injecting %d CSS rules:', hideSelectors.length, text);
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}
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contextNodes.length = 0;
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};
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var applyCSS = function(selectors, prop, value) {
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if ( document.body === null ) {
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return;
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}
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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[prop] = value;
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}
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};
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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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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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if ( out !== undefined ) {
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out.push(selector);
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}
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}
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};
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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, 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 ( injectedSelectors[selector] === undefined && generics[selector] ) {
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injectedSelectors[selector] = true;
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if ( out !== undefined ) {
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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 ( injectedSelectors[selector] === undefined && generics[selector] ) {
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injectedSelectors[selector] = true;
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if ( out !== undefined ) {
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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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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, selector;
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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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selector = generics[hash];
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if ( selector === undefined ) { continue; }
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if ( injectedSelectors[selector] !== undefined ) { continue; }
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injectedSelectors[selector] = true;
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if ( out !== undefined ) {
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out.push(selector);
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}
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}
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};
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var processHighHighGenerics = function(generics, out) {
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if ( injectedSelectors[generics] !== undefined ) { return; }
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if ( document.querySelector(generics) === null ) { return; }
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injectedSelectors[generics] = true;
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if ( out !== undefined ) {
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var selectors = generics.split(',\n');
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var i = selectors.length;
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while ( i-- ) {
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if ( injectedSelectors[selectors[i]] !== undefined ) {
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selectors.splice(i, 1);
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}
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}
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out.push(selectors.join(',\n'));
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}
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};
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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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// quite unlikely, so no need to be fancy
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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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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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domLoaded();
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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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'style': true,
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'STYLE': true,
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'script': true,
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'SCRIPT': true
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};
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var mutationObservedHandler = function(mutations) {
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var iMutation = mutations.length;
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var nodes = [];
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var nodeList, iNode, node;
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while ( iMutation-- ) {
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nodeList = mutations[iMutation].addedNodes;
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if ( !nodeList ) {
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continue;
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}
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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[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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if ( contextNodes.length !== 0 ) {
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idsFromNodeList(selectNodes('[id]'));
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classesFromNodeList(selectNodes('[class]'));
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retrieveGenericSelectors();
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}
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};
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// https://github.com/gorhill/httpswitchboard/issues/176
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var observer = new MutationObserver(mutationObservedHandler);
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observer.observe(document.body, {
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attributes: false,
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childList: true,
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characterData: false,
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subtree: true
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});
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})();
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/******************************************************************************/
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/7
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(function() {
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var messaging = uBlockMessaging;
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var hideOne = function(elem, collapse) {
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// If `!important` is not there, going back using history will likely
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// cause the hidden element to re-appear.
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elem.style.visibility = 'hidden !important';
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if ( collapse && elem.parentNode ) {
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elem.parentNode.removeChild(elem);
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}
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};
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// First pass
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messaging.ask({ what: 'blockedRequests' }, function(details) {
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var elems = document.querySelectorAll('img,iframe,embed');
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var blockedRequests = details.blockedRequests;
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var collapse = details.collapse;
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var i = elems.length;
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var elem, src;
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while ( i-- ) {
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elem = elems[i];
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src = elem.src;
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if ( typeof src !== 'string' || src === '' ) {
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continue;
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}
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if ( blockedRequests[src] ) {
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hideOne(elem, collapse);
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}
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}
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});
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// Listeners to mop up whatever is otherwise missed:
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// - Future requests not blocked yet
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// - Elements dynamically added to the page
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// - Elements which resource URL changes
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var onResourceLoaded = function(ev) {
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var target = ev.target;
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//console.debug('Loaded %s[src="%s"]', target.tagName, target.src);
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if ( !target || !target.src ) { return; }
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if ( target.tagName.toLowerCase() !== 'iframe' ) { return; }
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var onAnswerReceived = function(details) {
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if ( details.blocked ) {
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hideOne(target, details.collapse);
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}
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};
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messaging.ask({ what: 'blockedRequest', url: target.src }, onAnswerReceived);
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};
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var onResourceFailed = function(ev) {
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var target = ev.target;
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//console.debug('Failed to load %s[src="%s"]', target.tagName, target.src);
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if ( !target || !target.src ) { return; }
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if ( target.tagName.toLowerCase() !== 'img' ) { return; }
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var onAnswerReceived = function(details) {
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if ( details.blocked ) {
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hideOne(target, details.collapse);
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}
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};
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messaging.ask({ what: 'blockedRequest', url: target.src }, onAnswerReceived);
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};
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document.addEventListener('load', onResourceLoaded, true);
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document.addEventListener('error', onResourceFailed, true);
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})();
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/******************************************************************************/
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