mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-11 17:41:03 +01:00
434 lines
15 KiB
JavaScript
434 lines
15 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2017-2018 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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*/
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'use strict';
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/******************************************************************************/
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µBlock.scriptletFilteringEngine = (function() {
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let api = {};
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let µb = µBlock,
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scriptletDB = new µb.staticExtFilteringEngine.HostnameBasedDB(),
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duplicates = new Set(),
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acceptedCount = 0,
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discardedCount = 0,
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scriptletCache = new µb.MRUCache(32),
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exceptionsRegister = new Set(),
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scriptletsRegister = new Map(),
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reEscapeScriptArg = /[\\'"]/g;
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// Purpose of `contentscriptCode` below is too programmatically inject
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// content script code which only purpose is to inject scriptlets. This
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// essentially does the same as what uBO's declarative content script does,
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// except that this allows to inject the scriptlets earlier than it is
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// possible through the declarative content script.
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//
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// Declaratively:
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// 1. Browser injects generic content script =>
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// 2. Content script queries scriptlets =>
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// 3. Main process sends scriptlets =>
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// 4. Content script injects scriptlets
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//
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// Programmatically:
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// 1. uBO injects specific scriptlets-aware content script =>
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// 2. Content script injects scriptlets
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//
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// However currently this programmatic injection works well only on
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// Chromium-based browsers, it does not work properly with Firefox. More
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// investigations is needed to find out why this fails with Firefox.
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// Consequently, the programmatic-injection code path is taken only with
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// Chromium-based browsers.
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let contentscriptCode = (function() {
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let parts = [
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'(',
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function(hostname, scriptlets) {
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if (
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document.location === null ||
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hostname !== document.location.hostname
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) {
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return;
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}
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let injectScriptlets = function(d) {
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let script;
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try {
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script = d.createElement('script');
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script.appendChild(d.createTextNode(
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decodeURIComponent(scriptlets))
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);
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(d.head || d.documentElement).appendChild(script);
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} catch (ex) {
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}
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if ( script ) {
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if ( script.parentNode ) {
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script.parentNode.removeChild(script);
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}
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script.textContent = '';
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}
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};
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injectScriptlets(document);
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let processIFrame = function(iframe) {
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let src = iframe.src;
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if ( /^https?:\/\//.test(src) === false ) {
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injectScriptlets(iframe.contentDocument);
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}
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};
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let observerTimer,
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observerLists = [];
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let observerAsync = function() {
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for ( let nodelist of observerLists ) {
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for ( let node of nodelist ) {
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if ( node.nodeType !== 1 ) { continue; }
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if ( node.parentElement === null ) { continue; }
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if ( node.localName === 'iframe' ) {
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processIFrame(node);
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}
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if ( node.childElementCount === 0 ) { continue; }
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let iframes = node.querySelectorAll('iframe');
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for ( let iframe of iframes ) {
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processIFrame(iframe);
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}
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}
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}
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observerLists = [];
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observerTimer = undefined;
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};
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let ready = function(ev) {
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if ( ev !== undefined ) {
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window.removeEventListener(ev.type, ready);
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}
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let iframes = document.getElementsByTagName('iframe');
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if ( iframes.length !== 0 ) {
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observerLists.push(iframes);
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observerTimer = setTimeout(observerAsync, 1);
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}
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let observer = new MutationObserver(function(mutations) {
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for ( let mutation of mutations ) {
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if ( mutation.addedNodes.length !== 0 ) {
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observerLists.push(mutation.addedNodes);
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}
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}
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if (
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observerLists.length !== 0 &&
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observerTimer === undefined
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) {
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observerTimer = setTimeout(observerAsync, 1);
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}
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});
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observer.observe(
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document.documentElement,
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{ childList: true, subtree: true }
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);
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};
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if ( document.readyState === 'loading' ) {
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window.addEventListener('DOMContentLoaded', ready);
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} else {
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ready();
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}
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}.toString(),
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')(',
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'"', 'hostname-slot', '", ',
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'"', 'scriptlets-slot', '"',
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'); void 0;',
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];
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return {
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parts: parts,
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hostnameSlot: parts.indexOf('hostname-slot'),
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scriptletsSlot: parts.indexOf('scriptlets-slot'),
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assemble: function(hostname, scriptlets) {
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this.parts[this.hostnameSlot] = hostname;
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this.parts[this.scriptletsSlot] =
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encodeURIComponent(scriptlets);
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return this.parts.join('');
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}
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};
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})();
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let lookupScriptlet = function(raw, reng, toInject) {
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if ( toInject.has(raw) ) { return; }
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if ( scriptletCache.resetTime < reng.modifyTime ) {
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scriptletCache.reset();
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}
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var content = scriptletCache.lookup(raw);
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if ( content === undefined ) {
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var token, args,
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pos = raw.indexOf(',');
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if ( pos === -1 ) {
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token = raw;
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} else {
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token = raw.slice(0, pos).trim();
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args = raw.slice(pos + 1).trim();
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}
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content = reng.resourceContentFromName(token, 'application/javascript');
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if ( !content ) { return; }
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if ( args ) {
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content = patchScriptlet(content, args);
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if ( !content ) { return; }
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}
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content =
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'try {\n' +
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content + '\n' +
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'} catch ( e ) { }';
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scriptletCache.add(raw, content);
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}
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toInject.set(raw, content);
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};
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// Fill template placeholders. Return falsy if:
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// - At least one argument contains anything else than /\w/ and `.`
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let patchScriptlet = function(content, args) {
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var i = 1,
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pos, arg;
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while ( args !== '' ) {
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pos = args.indexOf(',');
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if ( pos === -1 ) { pos = args.length; }
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arg = args.slice(0, pos).trim().replace(reEscapeScriptArg, '\\$&');
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content = content.replace('{{' + i + '}}', arg);
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args = args.slice(pos + 1).trim();
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i++;
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}
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return content;
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};
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let logOne = function(isException, token, details) {
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µb.logger.writeOne(
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details.tabId,
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'cosmetic',
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{
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source: 'cosmetic',
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raw: (isException ? '#@#' : '##') + 'script:inject(' + token + ')'
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},
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'dom',
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details.url,
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null,
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details.hostname
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);
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};
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api.reset = function() {
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scriptletDB.clear();
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duplicates.clear();
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acceptedCount = 0;
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discardedCount = 0;
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};
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api.freeze = function() {
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duplicates.clear();
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};
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api.compile = function(parsed, writer) {
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// 1001 = scriptlet injection
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writer.select(1001);
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// Only exception filters are allowed to be global.
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if ( parsed.hostnames.length === 0 ) {
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if ( parsed.exception ) {
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writer.push([ 32, '!', '', parsed.suffix ]);
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}
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return;
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}
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// https://github.com/gorhill/uBlock/issues/3375
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// Ignore instances of exception filter with negated hostnames,
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// because there is no way to create an exception to an exception.
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var µburi = µb.URI;
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for ( var hostname of parsed.hostnames ) {
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var negated = hostname.charCodeAt(0) === 0x7E /* '~' */;
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if ( negated ) {
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hostname = hostname.slice(1);
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}
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var hash = µburi.domainFromHostname(hostname);
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if ( parsed.exception ) {
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if ( negated ) { continue; }
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hash = '!' + hash;
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} else if ( negated ) {
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hash = '!' + hash;
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}
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writer.push([ 32, hash, hostname, parsed.suffix ]);
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}
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};
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// 01234567890123456789
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// script:inject(token[, arg[, ...]])
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// ^ ^
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// 14 -1
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api.fromCompiledContent = function(reader) {
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// 1001 = scriptlet injection
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reader.select(1001);
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while ( reader.next() ) {
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acceptedCount += 1;
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var fingerprint = reader.fingerprint();
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if ( duplicates.has(fingerprint) ) {
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discardedCount += 1;
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continue;
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}
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duplicates.add(fingerprint);
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var args = reader.args();
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if ( args.length < 4 ) { continue; }
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scriptletDB.add(
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args[1],
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{ hostname: args[2], token: args[3].slice(14, -1) }
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);
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}
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};
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api.retrieve = function(request) {
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if ( scriptletDB.size === 0 ) { return; }
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if ( µb.hiddenSettings.ignoreScriptInjectFilters ) { return; }
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var reng = µb.redirectEngine;
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if ( !reng ) { return; }
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var hostname = request.hostname;
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// https://github.com/gorhill/uBlock/issues/2835
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// Do not inject scriptlets if the site is under an `allow` rule.
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if (
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µb.userSettings.advancedUserEnabled &&
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µb.sessionFirewall.evaluateCellZY(hostname, hostname, '*') === 2
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) {
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return;
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}
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let domain = request.domain,
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entity = request.entity;
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// https://github.com/gorhill/uBlock/issues/1954
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// Implicit
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var hn = hostname;
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for (;;) {
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lookupScriptlet(hn + '.js', reng, scriptletsRegister);
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if ( hn === domain ) { break; }
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var pos = hn.indexOf('.');
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if ( pos === -1 ) { break; }
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hn = hn.slice(pos + 1);
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}
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if ( entity !== '' ) {
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lookupScriptlet(entity + '.js', reng, scriptletsRegister);
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}
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// Explicit
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let entries = [];
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if ( domain !== '' ) {
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scriptletDB.retrieve(domain, hostname, entries);
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scriptletDB.retrieve(entity, entity, entries);
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}
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scriptletDB.retrieve('', hostname, entries);
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for ( let entry of entries ) {
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lookupScriptlet(entry.token, reng, scriptletsRegister);
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}
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if ( scriptletsRegister.size === 0 ) { return; }
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// Collect exception filters.
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entries = [];
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if ( domain !== '' ) {
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scriptletDB.retrieve('!' + domain, hostname, entries);
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scriptletDB.retrieve('!' + entity, entity, entries);
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}
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scriptletDB.retrieve('!', hostname, entries);
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for ( let entry of entries ) {
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exceptionsRegister.add(entry.token);
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}
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// Return an array of scriptlets, and log results if needed.
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let out = [],
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logger = µb.logger.isEnabled() ? µb.logger : null,
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isException;
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for ( let entry of scriptletsRegister ) {
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if ( (isException = exceptionsRegister.has(entry[0])) === false ) {
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out.push(entry[1]);
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}
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if ( logger !== null ) {
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logOne(isException, entry[0], request);
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}
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}
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scriptletsRegister.clear();
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exceptionsRegister.clear();
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if ( out.length === 0 ) { return; }
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return out.join('\n');
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};
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api.injectNow = function(details) {
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if ( typeof details.frameId !== 'number' ) { return; }
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if ( µb.URI.isNetworkURI(details.url) === false ) { return; }
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let request = {
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tabId: details.tabId,
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frameId: details.frameId,
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url: details.url,
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hostname: µb.URI.hostnameFromURI(details.url),
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domain: undefined,
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entity: undefined
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};
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request.domain = µb.URI.domainFromHostname(request.hostname);
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request.entity = µb.URI.entityFromDomain(request.domain);
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let scriptlets = µb.scriptletFilteringEngine.retrieve(request);
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if ( scriptlets === undefined ) { return; }
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let code = contentscriptCode.assemble(request.hostname, scriptlets);
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if ( µb.hiddenSettings.debugScriptlets ) {
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code = 'debugger;\n' + code;
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}
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chrome.tabs.executeScript(
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details.tabId,
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{
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code: code,
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frameId: details.frameId,
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matchAboutBlank: false,
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runAt: 'document_start'
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}
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);
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};
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api.toSelfie = function() {
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return scriptletDB.toSelfie();
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};
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api.fromSelfie = function(selfie) {
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scriptletDB = new µb.staticExtFilteringEngine.HostnameBasedDB(selfie);
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};
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Object.defineProperties(api, {
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acceptedCount: {
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get: function() {
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return acceptedCount;
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}
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},
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discardedCount: {
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get: function() {
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return discardedCount;
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}
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}
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});
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return api;
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})();
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/******************************************************************************/
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