mirror of https://github.com/gorhill/uBlock.git
120 lines
3.4 KiB
JavaScript
120 lines
3.4 KiB
JavaScript
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/*******************************************************************************
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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-on-property-write
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/// alias aopw
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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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// $rulesetId$
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const argsMap = new Map(self.$argsMap$);
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const hostnamesMap = new Map(self.$hostnamesMap$);
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/******************************************************************************/
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const magic =
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String.fromCharCode(Date.now() % 26 + 97) +
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Math.floor(Math.random() * 982451653 + 982451653).toString(36);
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const abort = function() {
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throw new ReferenceError(magic);
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};
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const scriptlet = (
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prop = ''
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) => {
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let owner = window;
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for (;;) {
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const pos = prop.indexOf('.');
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if ( pos === -1 ) { break; }
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owner = owner[prop.slice(0, pos)];
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if ( owner instanceof Object === false ) { return; }
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prop = prop.slice(pos + 1);
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}
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delete owner[prop];
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Object.defineProperty(owner, prop, {
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set: function() {
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abort();
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}
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});
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const oe = window.onerror;
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window.onerror = function(msg, src, line, col, error) {
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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(msg, src, line, col, error);
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}
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}.bind();
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};
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/******************************************************************************/
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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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if ( hn === '*' ) { break; }
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const pos = hn.indexOf('.');
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if ( pos !== -1 ) {
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hn = hn.slice(pos + 1);
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} else {
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hn = '*';
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}
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}
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/******************************************************************************/
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argsMap.clear();
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hostnamesMap.clear();
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/******************************************************************************/
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})();
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/******************************************************************************/
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