mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-07 11:22:38 +01:00
205 lines
6.3 KiB
JavaScript
205 lines
6.3 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 set-constant
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/// alias set
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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 scriptlet = (
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chain = '',
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cValue = ''
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) => {
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if ( chain === '' ) { return; }
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if ( cValue === 'undefined' ) {
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cValue = undefined;
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} else if ( cValue === 'false' ) {
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cValue = false;
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} else if ( cValue === 'true' ) {
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cValue = true;
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} else if ( cValue === 'null' ) {
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cValue = null;
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} else if ( cValue === "''" ) {
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cValue = '';
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} else if ( cValue === '[]' ) {
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cValue = [];
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} else if ( cValue === '{}' ) {
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cValue = {};
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} else if ( cValue === 'noopFunc' ) {
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cValue = function(){};
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} else if ( cValue === 'trueFunc' ) {
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cValue = function(){ return true; };
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} else if ( cValue === 'falseFunc' ) {
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cValue = function(){ return false; };
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} else if ( /^\d+$/.test(cValue) ) {
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cValue = parseFloat(cValue);
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if ( isNaN(cValue) ) { return; }
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if ( Math.abs(cValue) > 0x7FFF ) { return; }
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} else {
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return;
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}
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let aborted = false;
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const mustAbort = function(v) {
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if ( aborted ) { return true; }
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aborted =
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(v !== undefined && v !== null) &&
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(cValue !== undefined && cValue !== null) &&
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(typeof v !== typeof cValue);
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return aborted;
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};
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// https://github.com/uBlockOrigin/uBlock-issues/issues/156
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// Support multiple trappers for the same property.
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const trapProp = function(owner, prop, configurable, handler) {
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if ( handler.init(owner[prop]) === false ) { return; }
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const odesc = Object.getOwnPropertyDescriptor(owner, prop);
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let prevGetter, prevSetter;
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if ( odesc instanceof Object ) {
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owner[prop] = cValue;
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if ( odesc.get instanceof Function ) {
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prevGetter = odesc.get;
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}
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if ( odesc.set instanceof Function ) {
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prevSetter = odesc.set;
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}
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}
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try {
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Object.defineProperty(owner, prop, {
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configurable,
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get() {
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if ( prevGetter !== undefined ) {
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prevGetter();
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}
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return handler.getter(); // cValue
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},
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set(a) {
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if ( prevSetter !== undefined ) {
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prevSetter(a);
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}
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handler.setter(a);
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}
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});
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} catch(ex) {
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}
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};
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const trapChain = function(owner, chain) {
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const pos = chain.indexOf('.');
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if ( pos === -1 ) {
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trapProp(owner, chain, false, {
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v: undefined,
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init: function(v) {
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if ( mustAbort(v) ) { return false; }
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this.v = v;
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return true;
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},
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getter: function() {
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return cValue;
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},
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setter: function(a) {
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if ( mustAbort(a) === false ) { return; }
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cValue = a;
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}
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});
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return;
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}
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const prop = chain.slice(0, pos);
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const v = owner[prop];
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chain = chain.slice(pos + 1);
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if ( v instanceof Object || typeof v === 'object' && v !== null ) {
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trapChain(v, chain);
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return;
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}
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trapProp(owner, prop, true, {
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v: undefined,
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init: function(v) {
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this.v = v;
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return true;
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},
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getter: function() {
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return this.v;
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},
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setter: function(a) {
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this.v = a;
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if ( a instanceof Object ) {
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trapChain(a, chain);
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}
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}
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});
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};
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trapChain(window, chain);
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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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