mirror of https://github.com/gorhill/uBlock.git
307 lines
9.1 KiB
JavaScript
307 lines
9.1 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a comprehensive, efficient content blocker
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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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import { registerScriptlet } from './base.js';
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import { runAt } from './run-at.js';
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import { safeSelf } from './safe-self.js';
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/******************************************************************************/
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export function setAttrFn(
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logPrefix,
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selector = '',
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attr = '',
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value = ''
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) {
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if ( selector === '' ) { return; }
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if ( attr === '' ) { return; }
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const safe = safeSelf();
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const copyFrom = /^\[.+\]$/.test(value)
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? value.slice(1, -1)
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: '';
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const extractValue = elem => copyFrom !== ''
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? elem.getAttribute(copyFrom) || ''
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: value;
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const applySetAttr = ( ) => {
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let elems;
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try {
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elems = document.querySelectorAll(selector);
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} catch(_) {
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return false;
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}
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for ( const elem of elems ) {
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const before = elem.getAttribute(attr);
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const after = extractValue(elem);
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if ( after === before ) { continue; }
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if ( after !== '' && /^on/i.test(attr) ) {
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if ( attr.toLowerCase() in elem ) { continue; }
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}
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elem.setAttribute(attr, after);
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safe.uboLog(logPrefix, `${attr}="${after}"`);
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}
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return true;
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};
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let observer, timer;
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const onDomChanged = mutations => {
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if ( timer !== undefined ) { return; }
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let shouldWork = false;
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for ( const mutation of mutations ) {
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if ( mutation.addedNodes.length === 0 ) { continue; }
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for ( const node of mutation.addedNodes ) {
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if ( node.nodeType !== 1 ) { continue; }
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shouldWork = true;
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break;
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}
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if ( shouldWork ) { break; }
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}
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if ( shouldWork === false ) { return; }
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timer = self.requestAnimationFrame(( ) => {
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timer = undefined;
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applySetAttr();
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});
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};
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const start = ( ) => {
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if ( applySetAttr() === false ) { return; }
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observer = new MutationObserver(onDomChanged);
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observer.observe(document.body, {
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subtree: true,
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childList: true,
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});
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};
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runAt(( ) => { start(); }, 'idle');
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}
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registerScriptlet(setAttrFn, {
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name: 'set-attr.fn',
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dependencies: [
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runAt,
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safeSelf,
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],
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});
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/**
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* @scriptlet set-attr
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*
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* @description
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* Sets the specified attribute on the specified elements. This scriptlet runs
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* once when the page loads then afterward on DOM mutations.
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*
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* Reference: https://github.com/AdguardTeam/Scriptlets/blob/master/src/scriptlets/set-attr.js
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*
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* @param selector
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* A CSS selector for the elements to target.
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*
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* @param attr
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* The name of the attribute to modify.
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*
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* @param value
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* The new value of the attribute. Supported values:
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* - `''`: empty string (default)
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* - `true`
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* - `false`
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* - positive decimal integer 0 <= value < 32768
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* - `[other]`: copy the value from attribute `other` on the same element
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*
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* */
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export function setAttr(
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selector = '',
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attr = '',
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value = ''
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) {
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const safe = safeSelf();
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const logPrefix = safe.makeLogPrefix('set-attr', selector, attr, value);
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const validValues = [ '', 'false', 'true' ];
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if ( validValues.includes(value.toLowerCase()) === false ) {
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if ( /^\d+$/.test(value) ) {
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const n = parseInt(value, 10);
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if ( n >= 32768 ) { return; }
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value = `${n}`;
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} else if ( /^\[.+\]$/.test(value) === false ) {
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return;
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}
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}
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setAttrFn(logPrefix, selector, attr, value);
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}
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registerScriptlet(setAttr, {
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name: 'set-attr.js',
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dependencies: [
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safeSelf,
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setAttrFn,
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],
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world: 'ISOLATED',
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});
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/**
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* @trustedScriptlet trusted-set-attr
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*
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* @description
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* Sets the specified attribute on the specified elements. This scriptlet runs
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* once when the page loads then afterward on DOM mutations.
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*
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* Reference: https://github.com/AdguardTeam/Scriptlets/blob/master/wiki/about-trusted-scriptlets.md#-%EF%B8%8F-trusted-set-attr
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*
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* @param selector
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* A CSS selector for the elements to target.
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*
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* @param attr
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* The name of the attribute to modify.
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*
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* @param value
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* The new value of the attribute. Since the scriptlet requires a trusted
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* source, the value can be anything.
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*
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* */
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export function trustedSetAttr(
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selector = '',
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attr = '',
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value = ''
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) {
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const safe = safeSelf();
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const logPrefix = safe.makeLogPrefix('trusted-set-attr', selector, attr, value);
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setAttrFn(logPrefix, selector, attr, value);
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}
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registerScriptlet(trustedSetAttr, {
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name: 'trusted-set-attr.js',
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requiresTrust: true,
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dependencies: [
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safeSelf,
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setAttrFn,
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],
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world: 'ISOLATED',
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});
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/**
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* @scriptlet remove-attr
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*
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* @description
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* Remove one or more attributes from a set of elements.
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*
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* @param attribute
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* The name of the attribute(s) to remove. This can be a list of space-
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* separated attribute names.
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*
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* @param [selector]
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* Optional. A CSS selector for the elements to target. Default to
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* `[attribute]`, or `[attribute1],[attribute2],...` if more than one
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* attribute name is specified.
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*
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* @param [behavior]
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* Optional. Space-separated tokens which modify the default behavior.
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* - `asap`: Try to remove the attribute as soon as possible. Default behavior
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* is to remove the attribute(s) asynchronously.
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* - `stay`: Keep trying to remove the specified attribute(s) on DOM mutations.
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* */
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export function removeAttr(
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rawToken = '',
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rawSelector = '',
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behavior = ''
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) {
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if ( typeof rawToken !== 'string' ) { return; }
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if ( rawToken === '' ) { return; }
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const safe = safeSelf();
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const logPrefix = safe.makeLogPrefix('remove-attr', rawToken, rawSelector, behavior);
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const tokens = rawToken.split(/\s*\|\s*/);
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const selector = tokens
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.map(a => `${rawSelector}[${CSS.escape(a)}]`)
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.join(',');
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if ( safe.logLevel > 1 ) {
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safe.uboLog(logPrefix, `Target selector:\n\t${selector}`);
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}
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const asap = /\basap\b/.test(behavior);
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let timerId;
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const rmattrAsync = ( ) => {
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if ( timerId !== undefined ) { return; }
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timerId = safe.onIdle(( ) => {
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timerId = undefined;
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rmattr();
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}, { timeout: 17 });
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};
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const rmattr = ( ) => {
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if ( timerId !== undefined ) {
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safe.offIdle(timerId);
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timerId = undefined;
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}
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try {
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const nodes = document.querySelectorAll(selector);
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for ( const node of nodes ) {
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for ( const attr of tokens ) {
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if ( node.hasAttribute(attr) === false ) { continue; }
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node.removeAttribute(attr);
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safe.uboLog(logPrefix, `Removed attribute '${attr}'`);
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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 mutationHandler = mutations => {
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if ( timerId !== undefined ) { return; }
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let skip = true;
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for ( let i = 0; i < mutations.length && skip; i++ ) {
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const { type, addedNodes, removedNodes } = mutations[i];
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if ( type === 'attributes' ) { skip = false; }
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for ( let j = 0; j < addedNodes.length && skip; j++ ) {
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if ( addedNodes[j].nodeType === 1 ) { skip = false; break; }
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}
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for ( let j = 0; j < removedNodes.length && skip; j++ ) {
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if ( removedNodes[j].nodeType === 1 ) { skip = false; break; }
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}
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}
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if ( skip ) { return; }
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asap ? rmattr() : rmattrAsync();
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};
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const start = ( ) => {
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rmattr();
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if ( /\bstay\b/.test(behavior) === false ) { return; }
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const observer = new MutationObserver(mutationHandler);
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observer.observe(document, {
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attributes: true,
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attributeFilter: tokens,
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childList: true,
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subtree: true,
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});
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};
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runAt(( ) => { start(); }, behavior.split(/\s+/));
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}
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registerScriptlet(removeAttr, {
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name: 'remove-attr.js',
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aliases: [
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'ra.js',
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],
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dependencies: [
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runAt,
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safeSelf,
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],
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});
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/******************************************************************************/
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