mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-15 07:22:28 +02:00
483 lines
15 KiB
JavaScript
483 lines
15 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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(function() {
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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-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 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 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 ) {
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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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},
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retrieveHandler
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);
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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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if ( !selectors ) {
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return;
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}
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filterLowGenerics(selectors, 'donthide');
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filterHighGenerics(selectors, 'donthide');
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if ( selectors.donthide.length ) {
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var i = selectors.donthide.length;
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while ( i-- ) {
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injectedSelectors[selectors.donthide[i]] = true;
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}
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}
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filterLowGenerics(selectors, 'hide');
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filterHighGenerics(selectors, 'hide');
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reduce(selectors.hide, injectedSelectors);
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if ( selectors.hide.length ) {
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applyCSS(selectors.hide, 'display', 'none');
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var style = document.createElement('style');
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var text = selectors.hide.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:', selectors.hide.length, hideStyleText);
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}
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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 filterTitleGeneric = function(generics, root, out) {
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if ( !root.title.length ) {
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return;
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}
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var selector = '[title="' + root.title + '"]';
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if ( generics[selector] && !injectedSelectors[selector] ) {
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out.push(selector);
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}
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selector = root.tagName + selector;
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if ( generics[selector] && !injectedSelectors[selector] ) {
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out.push(selector);
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}
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};
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var filterAltGeneric = function(generics, root, out) {
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var alt = root.getAttribute('alt');
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if ( !alt || !alt.length ) {
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return;
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}
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var selector = '[alt="' + root.title + '"]';
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if ( generics[selector] && !injectedSelectors[selector] ) {
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out.push(selector);
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}
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selector = root.tagName + selector;
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if ( generics[selector] && !injectedSelectors[selector] ) {
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out.push(selector);
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}
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};
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var filterLowGenerics = function(selectors, what) {
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if ( selectors[what + 'LowGenericCount'] === 0 ) {
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return;
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}
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var out = selectors[what];
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var generics = selectors[what + 'LowGenerics'];
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var nodeList, iNode;
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// Low generics: ["title"]
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nodeList = document.querySelectorAll('[title]');
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iNode = nodeList.length;
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while ( iNode-- ) {
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filterTitleGeneric(generics, nodeList[iNode], out);
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}
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// Low generics: ["alt"]
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nodeList = document.querySelectorAll('[alt]');
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iNode = nodeList.length;
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while ( iNode-- ) {
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filterAltGeneric(generics, nodeList[iNode], out);
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}
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};
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var filterHighGenerics = function(selectors, what) {
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var out = selectors[what];
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var generics = selectors[what + 'HighGenerics'];
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var iGeneric = generics.length;
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var selector;
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while ( iGeneric-- ) {
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selector = generics[iGeneric];
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if ( injectedSelectors[selector] ) {
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continue;
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}
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if ( document.querySelector(selector) !== null ) {
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out.push(selector);
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}
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}
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};
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var reduce = function(selectors, dict) {
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var i = selectors.length, selector, end;
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while ( i-- ) {
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selector = selectors[i];
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if ( !dict[selector] ) {
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if ( end !== undefined ) {
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selectors.splice(i+1, end-i);
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end = undefined;
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}
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dict[selector] = true;
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} else if ( end === undefined ) {
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end = i;
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}
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}
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if ( end !== undefined ) {
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selectors.splice(0, end+1);
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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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var processNodeLists = function(nodeLists) {
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var i = nodeLists.length;
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var nodeList, j, node;
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while ( i-- ) {
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nodeList = nodeLists[i];
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idsFromNodeList(nodeList);
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classesFromNodeList(nodeList);
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j = nodeList.length;
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while ( j-- ) {
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node = nodeList[j];
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if ( typeof node.querySelectorAll === 'function' ) {
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idsFromNodeList(node.querySelectorAll('[id]'));
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classesFromNodeList(node.querySelectorAll('[class]'));
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}
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}
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}
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retrieveGenericSelectors();
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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 mutationObservedHandler = function(mutations) {
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var iMutation = mutations.length;
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var nodeLists = [], nodeList;
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while ( iMutation-- ) {
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nodeList = mutations[iMutation].addedNodes;
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if ( nodeList && nodeList.length ) {
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nodeLists.push(nodeList);
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}
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}
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if ( nodeLists.length ) {
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processNodeLists(nodeLists);
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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 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');
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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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if ( target.tagName.toLowerCase() !== 'iframe' ) { return; }
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if ( !target || !target.src ) { 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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if ( target.tagName.toLowerCase() !== 'img' ) { return; }
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if ( !target || !target.src ) { 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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})();
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