mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-23 06:01:40 +02:00
768 lines
25 KiB
JavaScript
768 lines
25 KiB
JavaScript
/*******************************************************************************
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µBlock - a 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 vAPI, HTMLDocument */
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/******************************************************************************/
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// Injected into content pages
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(function() {
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'use strict';
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/464
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if ( document instanceof HTMLDocument === false ) {
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//console.debug('contentscript-end.js > not a HTLMDocument');
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return false;
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}
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if ( !vAPI ) {
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//console.debug('contentscript-end.js > vAPI not found');
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return;
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}
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// https://github.com/gorhill/uBlock/issues/587
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// Pointless to execute without the start script having done its job.
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if ( !vAPI.contentscriptStartInjected ) {
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return;
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}
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// https://github.com/gorhill/uBlock/issues/456
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// Already injected?
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if ( vAPI.contentscriptEndInjected ) {
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//console.debug('contentscript-end.js > content script already injected');
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return;
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}
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vAPI.contentscriptEndInjected = true;
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/******************************************************************************/
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var messager = vAPI.messaging.channel('contentscript-end.js');
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/******************************************************************************/
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// https://github.com/gorhill/uBlock/issues/789
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// Be sure that specific cosmetic filters are still applied.
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// Executed once, then flushed from memory.
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(function() {
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// Were there specific cosmetic filters?
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if ( vAPI.specificHideStyle instanceof HTMLStyleElement === false ) {
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return;
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}
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// Is our style tag still in the DOM? (the guess is whatever parent there
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// is, it is in the DOM)
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if ( vAPI.specificHideStyle.parentNode !== null ) {
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return;
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}
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// Put it back
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var parent = document.head || document.documentElement;
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if ( parent ) {
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parent.appendChild(vAPI.specificHideStyle);
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}
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})();
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/******************************************************************************/
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// Cosmetic filters
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(function() {
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if ( vAPI.skipCosmeticFiltering ) {
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// console.debug('Abort cosmetic filtering');
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return;
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}
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//var timer = window.performance || Date;
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//var tStart = timer.now();
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var queriedSelectors = {};
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var injectedSelectors = {};
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var lowGenericSelectors = [];
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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 retrieveGenericSelectors = function() {
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if ( lowGenericSelectors.length !== 0 || highGenerics === null ) {
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//console.log('µBlock> ABP cosmetic filters: retrieving CSS rules using %d selectors', lowGenericSelectors.length);
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messager.send({
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what: 'retrieveGenericCosmeticSelectors',
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pageURL: window.location.href,
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selectors: lowGenericSelectors,
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highGenerics: highGenerics === null
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},
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retrieveHandler
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);
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// https://github.com/gorhill/uBlock/issues/452
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// There is only one first..
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retrieveHandler = otherRetrieveHandler;
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} else {
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otherRetrieveHandler(null);
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}
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lowGenericSelectors = [];
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};
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// https://github.com/gorhill/uBlock/issues/452
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// This needs to be executed *after* the response from our query is
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// received, not at `DOMContentLoaded` time, or else there is a good
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// likeliness to outrun contentscript-start.js, which may still be waiting
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// on a response from its own query.
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var firstRetrieveHandler = function(response) {
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// https://github.com/gorhill/uBlock/issues/158
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// Ensure injected styles are enforced
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// rhill 2014-11-16: not sure this is needed anymore. Test case in
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// above issue was fine without the line below..
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var selectors = vAPI.hideCosmeticFilters;
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if ( typeof selectors === 'object' ) {
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injectedSelectors = selectors;
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//hideElements(Object.keys(selectors));
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}
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// Add exception filters into injected filters collection, in order
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// to force them to be seen as "already injected".
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selectors = vAPI.donthideCosmeticFilters;
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if ( typeof selectors === 'object' ) {
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for ( var selector in selectors ) {
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if ( selectors.hasOwnProperty(selector) ) {
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injectedSelectors[selector] = true;
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}
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}
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}
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// Flush dead code from memory (does this work?)
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firstRetrieveHandler = null;
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otherRetrieveHandler(response);
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};
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var otherRetrieveHandler = function(selectors) {
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//var tStart = timer.now();
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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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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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//console.debug('%f: uBlock: CSS injection time', timer.now() - tStart);
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};
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var retrieveHandler = firstRetrieveHandler;
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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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// The linefeed before the style block is very important: do no remove!
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style.appendChild(document.createTextNode(selectors.toString() + '\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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messager.send({
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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.hasOwnProperty(selector) ) {
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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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// Candidate 1 = generic form
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// If generic form is injected, no need to process the specific
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// form, as the generic will affect all related specific forms
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selector = '[' + attr + '="' + attrValue + '"]';
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if ( generics.hasOwnProperty(selector) ) {
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if ( injectedSelectors.hasOwnProperty(selector) === false ) {
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injectedSelectors[selector] = true;
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out.push(selector);
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continue;
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}
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}
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// Candidate 2 = specific form
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selector = node.tagName.toLowerCase() + selector;
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if ( generics.hasOwnProperty(selector) ) {
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if ( injectedSelectors.hasOwnProperty(selector) === false ) {
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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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iSelector = selectors.length;
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while ( iSelector-- ) {
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selector = selectors[iSelector];
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if ( injectedSelectors.hasOwnProperty(selector) === false ) {
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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 processHighHighGenericsMisses = 8;
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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 ( highGenerics.hideHigh === '' ) {
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return;
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}
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if ( injectedSelectors.hasOwnProperty('{{highHighGenerics}}') ) {
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return;
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}
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//var tStart = timer.now();
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if ( document.querySelector(highGenerics.hideHigh) === null ) {
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//console.debug('%f: high-high generic test time', timer.now() - tStart);
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processHighHighGenericsMisses -= 1;
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// Too many misses for these nagging highly generic CSS rules,
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// so we will just skip them from now on.
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if ( processHighHighGenericsMisses === 0 ) {
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injectedSelectors['{{highHighGenerics}}'] = true;
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//console.debug('high-high generic: apparently not needed...');
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}
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return;
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}
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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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var qq = queriedSelectors;
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var ll = lowGenericSelectors;
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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.hasOwnProperty(v) ) { continue; }
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ll.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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var qq = queriedSelectors;
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var ll = lowGenericSelectors;
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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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vv = node.classList;
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if ( typeof vv !== 'object' ) { continue; }
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j = vv.length || 0;
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while ( j-- ) {
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v = vv[j];
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if ( typeof v !== 'string' ) { continue; }
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v = '.' + v;
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if ( qq.hasOwnProperty(v) ) { continue; }
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ll.push(v);
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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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idsFromNodeList(document.querySelectorAll('[id]'));
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classesFromNodeList(document.querySelectorAll('[class]'));
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retrieveGenericSelectors();
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//console.debug('%f: uBlock: survey time', timer.now() - tStart);
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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 ( node.nodeType !== 1 ) {
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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;
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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/uBlock/issues/205
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// Do not handle added node directly from within mutation observer.
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var treeMutationObservedHandlerAsync = function(mutations) {
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var iMutation = mutations.length;
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var nodeList;
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while ( iMutation-- ) {
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nodeList = mutations[iMutation].addedNodes;
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if ( nodeList.length !== 0 ) {
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addedNodeLists.push(nodeList);
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}
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}
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if ( addedNodeListsTimer === null ) {
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// I arbitrarily chose 100 ms for now:
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// I have to compromise between the overhead of processing too few
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// nodes too often and the delay of many nodes less often.
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addedNodeListsTimer = setTimeout(mutationObservedHandler, 100);
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}
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};
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// https://github.com/gorhill/httpswitchboard/issues/176
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var treeObserver = new MutationObserver(treeMutationObservedHandlerAsync);
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treeObserver.observe(document.body, {
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childList: true,
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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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|
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// Permanent
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(function() {
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// https://github.com/gorhill/uBlock/issues/683
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// Instead of a closure we use a map to remember the element to collapse
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var filterRequestId = 1;
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var filterRequests = {};
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var FilterRequest = function(target, selector) {
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this.id = filterRequestId++;
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this.target = target;
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this.selector = selector;
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};
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FilterRequest.send = function(target, tagName, prop, src) {
|
|
var req = new FilterRequest(
|
|
target,
|
|
tagName + '[' + prop + '="' + src + '"]'
|
|
);
|
|
filterRequests[req.id] = req;
|
|
messager.send(
|
|
{
|
|
what: 'filterRequest',
|
|
id: req.id,
|
|
tagName: tagName,
|
|
requestURL: src,
|
|
pageHostname: window.location.hostname,
|
|
pageURL: window.location.href
|
|
},
|
|
onAnswerReceived
|
|
);
|
|
};
|
|
|
|
// Process answer: collapse, hide, or do nothing.
|
|
|
|
var onAnswerReceived = function(details) {
|
|
// This should not happen under normal circumstances. It probably can
|
|
// happen if the extension is disabled though.
|
|
if ( typeof details !== 'object' || details === null ) {
|
|
return;
|
|
}
|
|
|
|
// This should definitely not happen
|
|
if ( filterRequests.hasOwnProperty(details.id) === false ) {
|
|
return;
|
|
}
|
|
|
|
var req = filterRequests[details.id];
|
|
delete filterRequests[details.id];
|
|
|
|
// https://github.com/gorhill/uBlock/issues/869
|
|
if ( details.collapse !== true ) {
|
|
return;
|
|
}
|
|
|
|
//console.log('contentscript-end.js > onAnswerReceived(%o)', req);
|
|
|
|
// If `!important` is not there, going back using history will
|
|
// likely cause the hidden element to re-appear.
|
|
// https://github.com/gorhill/uBlock/issues/399
|
|
|
|
// Never remove elements from the DOM, just hide them
|
|
req.target.style.setProperty('display', 'none', 'important');
|
|
|
|
messager.send({
|
|
what: 'injectedSelectors',
|
|
type: 'net',
|
|
hostname: window.location.hostname,
|
|
selectors: req.selector
|
|
});
|
|
};
|
|
|
|
// https://github.com/gorhill/uBlock/issues/174
|
|
// Do not remove fragment from src URL
|
|
|
|
// TODO: Find out whether trying to send more than one filter request per
|
|
// message is worth it.
|
|
|
|
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.lastIndexOf('http', 0) !== 0 ) {
|
|
return;
|
|
}
|
|
FilterRequest.send(target, tagName, prop, src);
|
|
};
|
|
|
|
// 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 onResourceLoaded = function(ev) {
|
|
//console.debug('onResourceLoaded(%o)', ev);
|
|
onResource(ev.target, loadedElements);
|
|
};
|
|
|
|
var onResourceFailed = function(ev) {
|
|
//console.debug('onResourceFailed(%o)', ev);
|
|
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 srcProps = {
|
|
'embed': 'src',
|
|
'iframe': 'src',
|
|
'img': 'src',
|
|
'object': 'data'
|
|
};
|
|
var elements = [];
|
|
|
|
var onAnswerReceived = function(details) {
|
|
if ( typeof details !== 'object' || details === null ) {
|
|
return;
|
|
}
|
|
var collapse = details.collapse;
|
|
|
|
// https://github.com/gorhill/uBlock/issues/869
|
|
if ( collapse !== true ) {
|
|
return;
|
|
}
|
|
|
|
var requests = details.requests;
|
|
var selectors = [];
|
|
var i = requests.length;
|
|
var request;
|
|
while ( i-- ) {
|
|
request = requests[i];
|
|
// https://github.com/gorhill/uBlock/issues/399
|
|
// Never remove elements from the DOM, just hide them
|
|
elements[request.index].style.setProperty('display', 'none', 'important');
|
|
selectors.push(request.tagName + '[' + srcProps[request.tagName] + '="' + request.url + '"]');
|
|
}
|
|
if ( selectors.length !== 0 ) {
|
|
messager.send({
|
|
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.lastIndexOf('http', 0) !== 0 ) {
|
|
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
|
|
};
|
|
messager.send(details, onAnswerReceived);
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
/******************************************************************************/
|
|
|
|
// To send mouse coordinates to context menu handler, as the chrome API fails
|
|
// to provide the mouse position to context menu listeners.
|
|
// This could be inserted in its own content script, but it's so simple that
|
|
// I feel it's not worth the overhead.
|
|
|
|
// Ref.: https://developer.mozilla.org/en-US/docs/Web/Events/contextmenu
|
|
|
|
(function() {
|
|
if ( window !== window.top ) {
|
|
return;
|
|
}
|
|
var onContextMenu = function(ev) {
|
|
messager.send({
|
|
what: 'contextMenuEvent',
|
|
clientX: ev.clientX,
|
|
clientY: ev.clientY
|
|
});
|
|
};
|
|
|
|
window.addEventListener('contextmenu', onContextMenu, true);
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
/******************************************************************************/
|
|
|
|
})();
|
|
|
|
/******************************************************************************/
|