mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-02 00:42:45 +01:00
4bd02c0fb6
This solves the following remaining issues regarding specific cosmetic filtering: - High rate of false positives in last build - High number of generated content css files in the package
174 lines
5.4 KiB
JavaScript
174 lines
5.4 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2019-present 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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The scriptlets below are meant to be injected only into a
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web page context.
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*/
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/* jshint esversion:11 */
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'use strict';
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/******************************************************************************/
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/// name abort-current-script
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/// alias acs
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/// alias abort-current-inline-script
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/// alias acis
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/******************************************************************************/
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// Important!
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// Isolate from global scope
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(function() {
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/******************************************************************************/
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// Issues to mind before changing anything:
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// https://github.com/uBlockOrigin/uBlock-issues/issues/2154
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const scriptlet = (
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target = '',
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needle = '',
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context = ''
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) => {
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if ( target === '' ) { return; }
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const reRegexEscape = /[.*+?^${}()|[\]\\]/g;
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const reNeedle = (( ) => {
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if ( needle === '' ) { return /^/; }
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if ( /^\/.+\/$/.test(needle) ) {
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return new RegExp(needle.slice(1,-1));
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}
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return new RegExp(needle.replace(reRegexEscape, '\\$&'));
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})();
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const reContext = (( ) => {
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if ( context === '' ) { return; }
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if ( /^\/.+\/$/.test(context) ) {
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return new RegExp(context.slice(1,-1));
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}
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return new RegExp(context.replace(reRegexEscape, '\\$&'));
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})();
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const chain = target.split('.');
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let owner = window;
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let prop;
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for (;;) {
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prop = chain.shift();
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if ( chain.length === 0 ) { break; }
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owner = owner[prop];
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if ( owner instanceof Object === false ) { return; }
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}
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let value;
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let desc = Object.getOwnPropertyDescriptor(owner, prop);
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if (
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desc instanceof Object === false ||
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desc.get instanceof Function === false
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) {
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value = owner[prop];
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desc = undefined;
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}
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const magic = String.fromCharCode(Date.now() % 26 + 97) +
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Math.floor(Math.random() * 982451653 + 982451653).toString(36);
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const scriptTexts = new WeakMap();
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const getScriptText = elem => {
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let text = elem.textContent;
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if ( text.trim() !== '' ) { return text; }
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if ( scriptTexts.has(elem) ) { return scriptTexts.get(elem); }
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const [ , mime, content ] =
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/^data:([^,]*),(.+)$/.exec(elem.src.trim()) ||
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[ '', '', '' ];
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try {
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switch ( true ) {
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case mime.endsWith(';base64'):
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text = self.atob(content);
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break;
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default:
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text = self.decodeURIComponent(content);
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break;
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}
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} catch(ex) {
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}
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scriptTexts.set(elem, text);
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return text;
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};
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const validate = ( ) => {
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const e = document.currentScript;
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if ( e instanceof HTMLScriptElement === false ) { return; }
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if ( reContext !== undefined && reContext.test(e.src) === false ) {
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return;
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}
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if ( reNeedle.test(getScriptText(e)) === false ) { return; }
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throw new ReferenceError(magic);
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};
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Object.defineProperty(owner, prop, {
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get: function() {
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validate();
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return desc instanceof Object
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? desc.get.call(owner)
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: value;
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},
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set: function(a) {
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validate();
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if ( desc instanceof Object ) {
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desc.set.call(owner, a);
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} else {
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value = a;
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}
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}
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});
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const oe = window.onerror;
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window.onerror = function(msg) {
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if ( typeof msg === 'string' && msg.includes(magic) ) {
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return true;
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}
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if ( oe instanceof Function ) {
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return oe.apply(this, arguments);
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}
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}.bind();
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};
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/******************************************************************************/
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const argsMap = new Map(self.$argsMap$);
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const hostnamesMap = new Map(self.$hostnamesMap$);
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let hn;
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try { hn = document.location.hostname; } catch(ex) { }
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while ( hn ) {
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if ( hostnamesMap.has(hn) ) {
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let argsHashes = hostnamesMap.get(hn);
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if ( typeof argsHashes === 'number' ) { argsHashes = [ argsHashes ]; }
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for ( const argsHash of argsHashes ) {
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const details = argsMap.get(argsHash);
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if ( details.n && details.n.includes(hn) ) { continue; }
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try { scriptlet(...details.a); } catch(ex) {}
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}
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}
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const pos = hn.indexOf('.');
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if ( pos === -1 ) { break; }
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hn = hn.slice(pos + 1);
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}
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/******************************************************************************/
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})();
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/******************************************************************************/
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