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Added special properties to spoof output of getBoundingClientRect().
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| /******************************************************************************* | ||
| uBlock Origin - a comprehensive, efficient content blocker | ||
| Copyright (C) 2019-present Raymond Hill | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see {http://www.gnu.org/licenses/}. | ||
| Home: https://github.com/gorhill/uBlock | ||
| The scriptlets below are meant to be injected only into a | ||
| web page context. | ||
| */ | ||
|
|
||
| import { registerScriptlet } from './base.js'; | ||
| import { safeSelf } from './safe-self.js'; | ||
|
|
||
| /** | ||
| * @scriptlet spoof-css.js | ||
| * | ||
| * @description | ||
| * Spoof the value of CSS properties. | ||
| * | ||
| * @param selector | ||
| * A CSS selector for the element(s) to target. | ||
| * | ||
| * @param [property, value, ...] | ||
| * A list of property-value pairs of the style properties to spoof to the | ||
| * specified values. | ||
| * | ||
| * */ | ||
|
|
||
| export function spoofCSS( | ||
| selector, | ||
| ...args | ||
| ) { | ||
| if ( typeof selector !== 'string' ) { return; } | ||
| if ( selector === '' ) { return; } | ||
| const toCamelCase = s => s.replace(/-[a-z]/g, s => s.charAt(1).toUpperCase()); | ||
| const propToValueMap = new Map(); | ||
| const privatePropToValueMap = new Map(); | ||
| for ( let i = 0; i < args.length; i += 2 ) { | ||
| const prop = toCamelCase(args[i+0]); | ||
| if ( typeof prop !== 'string' ) { break; } | ||
| if ( prop === '' ) { break; } | ||
| const value = args[i+1]; | ||
| if ( typeof value !== 'string' ) { break; } | ||
| if ( prop.charCodeAt(0) === 0x5F /* _ */ ) { | ||
| privatePropToValueMap.set(prop, value); | ||
| } else { | ||
| propToValueMap.set(toCamelCase(prop), value); | ||
| } | ||
| } | ||
| const safe = safeSelf(); | ||
| const logPrefix = safe.makeLogPrefix('spoof-css', selector, ...args); | ||
| const instanceProperties = [ 'cssText', 'length', 'parentRule' ]; | ||
| const spoofStyle = (prop, real) => { | ||
| const normalProp = toCamelCase(prop); | ||
| const shouldSpoof = propToValueMap.has(normalProp); | ||
| const value = shouldSpoof ? propToValueMap.get(normalProp) : real; | ||
| if ( shouldSpoof ) { | ||
| safe.uboLog(logPrefix, `Spoofing ${prop} to ${value}`); | ||
| } | ||
| return value; | ||
| }; | ||
| const cloackFunc = (fn, thisArg, name) => { | ||
| const trap = fn.bind(thisArg); | ||
| Object.defineProperty(trap, 'name', { value: name }); | ||
| Object.defineProperty(trap, 'toString', { | ||
| value: ( ) => `function ${name}() { [native code] }` | ||
| }); | ||
| return trap; | ||
| }; | ||
| self.getComputedStyle = new Proxy(self.getComputedStyle, { | ||
| apply: function(target, thisArg, args) { | ||
| // eslint-disable-next-line no-debugger | ||
| if ( privatePropToValueMap.has('_debug') ) { debugger; } | ||
| const style = Reflect.apply(target, thisArg, args); | ||
| const targetElements = new WeakSet(document.querySelectorAll(selector)); | ||
| if ( targetElements.has(args[0]) === false ) { return style; } | ||
| const proxiedStyle = new Proxy(style, { | ||
| get(target, prop) { | ||
| if ( typeof target[prop] === 'function' ) { | ||
| if ( prop === 'getPropertyValue' ) { | ||
| return cloackFunc(function getPropertyValue(prop) { | ||
| return spoofStyle(prop, target[prop]); | ||
| }, target, 'getPropertyValue'); | ||
| } | ||
| return cloackFunc(target[prop], target, prop); | ||
| } | ||
| if ( instanceProperties.includes(prop) ) { | ||
| return Reflect.get(target, prop); | ||
| } | ||
| return spoofStyle(prop, Reflect.get(target, prop)); | ||
| }, | ||
| getOwnPropertyDescriptor(target, prop) { | ||
| if ( propToValueMap.has(prop) ) { | ||
| return { | ||
| configurable: true, | ||
| enumerable: true, | ||
| value: propToValueMap.get(prop), | ||
| writable: true, | ||
| }; | ||
| } | ||
| return Reflect.getOwnPropertyDescriptor(target, prop); | ||
| }, | ||
| }); | ||
| return proxiedStyle; | ||
| }, | ||
| get(target, prop) { | ||
| if ( prop === 'toString' ) { | ||
| return target.toString.bind(target); | ||
| } | ||
| return Reflect.get(target, prop); | ||
| }, | ||
| }); | ||
| Element.prototype.getBoundingClientRect = new Proxy(Element.prototype.getBoundingClientRect, { | ||
| apply: function(target, thisArg, args) { | ||
| // eslint-disable-next-line no-debugger | ||
| if ( privatePropToValueMap.has('_debug') ) { debugger; } | ||
| const rect = Reflect.apply(target, thisArg, args); | ||
| const targetElements = new WeakSet(document.querySelectorAll(selector)); | ||
| if ( targetElements.has(thisArg) === false ) { return rect; } | ||
| let { x, y, height, width } = rect; | ||
| if ( privatePropToValueMap.has('_rectx') ) { | ||
| x = parseFloat(privatePropToValueMap.get('_rectx')); | ||
| } | ||
| if ( privatePropToValueMap.has('_recty') ) { | ||
| y = parseFloat(privatePropToValueMap.get('_recty')); | ||
| } | ||
| if ( privatePropToValueMap.has('_rectw') ) { | ||
| width = parseFloat(privatePropToValueMap.get('_rectw')); | ||
| } else if ( propToValueMap.has('width') ) { | ||
| width = parseFloat(propToValueMap.get('width')); | ||
| } | ||
| if ( privatePropToValueMap.has('_recth') ) { | ||
| height = parseFloat(privatePropToValueMap.get('_recth')); | ||
| } else if ( propToValueMap.has('height') ) { | ||
| height = parseFloat(propToValueMap.get('height')); | ||
| } | ||
| return new self.DOMRect(x, y, width, height); | ||
| }, | ||
| get(target, prop) { | ||
| if ( prop === 'toString' ) { | ||
| return target.toString.bind(target); | ||
| } | ||
| return Reflect.get(target, prop); | ||
| }, | ||
| }); | ||
| } | ||
| registerScriptlet(spoofCSS, { | ||
| name: 'spoof-css.js', | ||
| dependencies: [ | ||
| safeSelf, | ||
| ], | ||
| }); |