mirror of
https://github.com/gorhill/uBlock.git
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199 lines
6.3 KiB
JavaScript
199 lines
6.3 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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/* jshint multistr: true */
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/* global chrome */
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// Injected into content pages
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/******************************************************************************/
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// OK, I keep changing my mind whether a closure should be used or not. This
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// will be the rule: if there are any variables directly accessed on a regular
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// basis, use a closure so that they are cached. Otherwise I don't think the
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// overhead of a closure is worth it. That's my understanding.
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(function() {
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/******************************************************************************/
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/******************************************************************************/
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// https://github.com/gorhill/httpswitchboard/issues/345
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var messaging = (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-start.js');
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/******************************************************************************/
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/******************************************************************************/
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// Domain-based ABP cosmetic filters.
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// These can be inserted before the DOM is loaded.
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var domainCosmeticFilteringHandler = function(selectors) {
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if ( !selectors ) {
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return;
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}
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var styleText = [];
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if ( selectors.hide.length ) {
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var hideStyleText = '{{hideSelectors}} {display:none !important;}'
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.replace('{{hideSelectors}}', selectors.hide.join(','));
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styleText.push(hideStyleText);
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domainCosmeticFilteringApplyCSS(selectors.hide, 'display', 'none');
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//console.debug('µBlock> "%s" cosmetic filters: injecting %d CSS rules:', selectors.domain, selectors.hide.length, hideStyleText);
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}
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if ( selectors.donthide.length ) {
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var dontHideStyleText = '{{donthideSelectors}} {display:initial !important;}'
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.replace('{{donthideSelectors}}', selectors.donthide.join(','));
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styleText.push(dontHideStyleText);
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domainCosmeticFilteringApplyCSS(selectors.donthide, 'display', 'initial');
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//console.debug('µBlock> "%s" cosmetic filters: injecting %d CSS rules:', selectors.domain, selectors.donthide.length, dontHideStyleText);
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}
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if ( styleText.length > 0 ) {
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var style = document.createElement('style');
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style.appendChild(document.createTextNode(styleText.join('\n')));
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var parent = document.head || document.documentElement;
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if ( parent ) {
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parent.appendChild(style);
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}
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}
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};
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var domainCosmeticFilteringApplyCSS = 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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messaging.ask(
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{
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what: 'retrieveDomainCosmeticSelectors',
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pageURL: window.location.href,
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locationURL: window.location.href
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},
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domainCosmeticFilteringHandler
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);
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/******************************************************************************/
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/******************************************************************************/
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// The port will never be used again at this point, disconnecting allows
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// the browser to flush this script from memory.
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messaging.stop();
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/******************************************************************************/
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/******************************************************************************/
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})();
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/******************************************************************************/
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