mirror of
https://github.com/gorhill/uBlock.git
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314 lines
11 KiB
JavaScript
314 lines
11 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.entity
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/// alias set.entity
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/******************************************************************************/
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// Important!
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// Isolate from global scope
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(function uBOL_setConstantEntity() {
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/******************************************************************************/
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// $rulesetId$
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const argsList = self.$argsList$;
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const entitiesMap = new Map(self.$entitiesMap$);
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/******************************************************************************/
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// Dependencies
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const scriptletGlobals = new Map();
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function safeSelf() {
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if ( scriptletGlobals.has('safeSelf') ) {
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return scriptletGlobals.get('safeSelf');
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}
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const safe = {
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'RegExp': self.RegExp,
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'RegExp_test': self.RegExp.prototype.test,
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'RegExp_exec': self.RegExp.prototype.exec,
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'addEventListener': self.EventTarget.prototype.addEventListener,
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'removeEventListener': self.EventTarget.prototype.removeEventListener,
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};
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scriptletGlobals.set('safeSelf', safe);
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return safe;
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}
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function runAt(fn, when) {
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const intFromReadyState = state => {
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const targets = {
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'loading': 1,
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'interactive': 2, 'end': 2, '2': 2,
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'complete': 3, 'idle': 3, '3': 3,
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};
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const tokens = Array.isArray(state) ? state : [ state ];
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for ( const token of tokens ) {
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const prop = `${token}`;
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if ( targets.hasOwnProperty(prop) === false ) { continue; }
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return targets[prop];
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}
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return 0;
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};
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const runAt = intFromReadyState(when);
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if ( intFromReadyState(document.readyState) >= runAt ) {
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fn(); return;
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}
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const onStateChange = ( ) => {
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if ( intFromReadyState(document.readyState) < runAt ) { return; }
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fn();
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safe.removeEventListener.apply(document, args);
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};
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const safe = safeSelf();
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const args = [ 'readystatechange', onStateChange, { capture: true } ];
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safe.addEventListener.apply(document, args);
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}
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/******************************************************************************/
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const scriptlet = (
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arg1 = '',
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arg2 = '',
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arg3 = ''
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) => {
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const details = typeof arg1 !== 'object'
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? { prop: arg1, value: arg2 }
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: arg1;
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if ( arg3 !== '' ) {
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if ( /^\d$/.test(arg3) ) {
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details.options = [ arg3 ];
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} else {
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details.options = Array.from(arguments).slice(2);
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}
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}
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const { prop: chain = '', value: cValue = '' } = details;
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if ( typeof chain !== 'string' ) { return; }
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if ( chain === '' ) { return; }
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const options = details.options || [];
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function setConstant(chain, cValue) {
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const trappedProp = (( ) => {
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const pos = chain.lastIndexOf('.');
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if ( pos === -1 ) { return chain; }
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return chain.slice(pos+1);
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})();
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if ( trappedProp === '' ) { return; }
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const thisScript = document.currentScript;
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const objectDefineProperty = Object.defineProperty.bind(Object);
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const cloakFunc = fn => {
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objectDefineProperty(fn, 'name', { value: trappedProp });
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const proxy = new Proxy(fn, {
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defineProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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deleteProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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get(target, prop) {
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if ( prop === 'toString' ) {
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return function() {
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return `function ${trappedProp}() { [native code] }`;
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}.bind(null);
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}
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return Reflect.get(...arguments);
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},
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});
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return proxy;
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};
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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 = cloakFunc(function(){});
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} else if ( cValue === 'trueFunc' ) {
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cValue = cloakFunc(function(){ return true; });
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} else if ( cValue === 'falseFunc' ) {
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cValue = cloakFunc(function(){ return false; });
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} else if ( /^-?\d+$/.test(cValue) ) {
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cValue = parseInt(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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if ( options.includes('asFunction') ) {
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cValue = ( ) => cValue;
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} else if ( options.includes('asCallback') ) {
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cValue = ( ) => (( ) => cValue);
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} else if ( options.includes('asResolved') ) {
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cValue = Promise.resolve(cValue);
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} else if ( options.includes('asRejected') ) {
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cValue = Promise.reject(cValue);
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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(configurable ? owner[prop] : cValue) === 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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objectDefineProperty(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 document.currentScript === thisScript
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? this.v
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: 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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runAt(( ) => {
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setConstant(chain, cValue);
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}, options);
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};
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/******************************************************************************/
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const hnparts = [];
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try { hnparts.push(...document.location.hostname.split('.')); } catch(ex) { }
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const hnpartslen = hnparts.length - 1;
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for ( let i = 0; i < hnpartslen; i++ ) {
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for ( let j = hnpartslen; j > i; j-- ) {
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const hn = hnparts.slice(i).join('.');
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const en = hnparts.slice(i,j).join('.');
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let argsIndices = entitiesMap.get(en);
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if ( argsIndices === undefined ) { continue; }
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if ( typeof argsIndices === 'number' ) { argsIndices = [ argsIndices ]; }
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for ( const argsIndex of argsIndices ) {
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const details = argsList[argsIndex];
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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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}
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argsList.length = 0;
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entitiesMap.clear();
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/******************************************************************************/
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})();
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/******************************************************************************/
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