mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-23 19:03:02 +01:00
11d24abea0
Related commit: - https://github.com/uBlockOrigin/uBlock-issues/issues/911 The motivation is to avoid executing code which is unnecessary on platforms not supporting the browser.dns API.
326 lines
12 KiB
JavaScript
326 lines
12 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2017-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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*/
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// For background page
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'use strict';
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/******************************************************************************/
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(( ) => {
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// https://github.com/uBlockOrigin/uBlock-issues/issues/407
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if ( vAPI.webextFlavor.soup.has('firefox') === false ) { return; }
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// https://github.com/gorhill/uBlock/issues/2950
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// Firefox 56 does not normalize URLs to ASCII, uBO must do this itself.
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// https://bugzilla.mozilla.org/show_bug.cgi?id=945240
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const evalMustPunycode = ( ) => {
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return vAPI.webextFlavor.soup.has('firefox') &&
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vAPI.webextFlavor.major < 57;
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};
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let mustPunycode = evalMustPunycode();
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// The real actual webextFlavor value may not be set in stone, so listen
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// for possible future changes.
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window.addEventListener('webextFlavor', ( ) => {
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mustPunycode = evalMustPunycode();
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}, { once: true });
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const punycode = self.punycode;
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const reAsciiHostname = /^https?:\/\/[0-9a-z_.:@-]+[/?#]/;
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const parsedURL = new URL('about:blank');
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// Canonical name-uncloaking feature.
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let cnameUncloak = browser.dns instanceof Object;
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let cnameUncloakProxied = false;
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// https://github.com/uBlockOrigin/uBlock-issues/issues/911
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// We detect here whether network requests are proxied, and if so,
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// de-aliasing of hostnames will be disabled to avoid possible
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// DNS leaks.
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const proxyDetector = function(details) {
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if ( details.proxyInfo instanceof Object ) {
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cnameUncloak = false;
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proxyDetectorTryCount = 0;
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}
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if ( proxyDetectorTryCount === 0 ) {
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browser.webRequest.onHeadersReceived.removeListener(proxyDetector);
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return;
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}
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proxyDetectorTryCount -= 1;
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};
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let proxyDetectorTryCount = 0;
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// Related issues:
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// - https://github.com/gorhill/uBlock/issues/1327
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// - https://github.com/uBlockOrigin/uBlock-issues/issues/128
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// - https://bugzilla.mozilla.org/show_bug.cgi?id=1503721
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// Extend base class to normalize as per platform.
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vAPI.Net = class extends vAPI.Net {
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constructor() {
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super();
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this.pendingRequests = [];
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this.cnames = new Map([ [ '', '' ] ]);
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this.cnameIgnoreList = null;
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this.cnameIgnore1stParty = true;
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this.cnameIgnoreExceptions = true;
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this.cnameIgnoreRootDocument = true;
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this.cnameMaxTTL = 120;
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this.cnameReplayFullURL = false;
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this.cnameFlushTime = Date.now() + this.cnameMaxTTL * 60000;
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}
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setOptions(options) {
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super.setOptions(options);
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if ( 'cnameUncloak' in options ) {
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cnameUncloak = browser.dns instanceof Object &&
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options.cnameUncloak !== false;
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}
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if ( 'cnameUncloakProxied' in options ) {
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cnameUncloakProxied = options.cnameUncloakProxied === true;
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}
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if ( 'cnameIgnoreList' in options ) {
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this.cnameIgnoreList =
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this.regexFromStrList(options.cnameIgnoreList);
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}
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if ( 'cnameIgnore1stParty' in options ) {
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this.cnameIgnore1stParty =
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options.cnameIgnore1stParty !== false;
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}
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if ( 'cnameIgnoreExceptions' in options ) {
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this.cnameIgnoreExceptions =
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options.cnameIgnoreExceptions !== false;
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}
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if ( 'cnameIgnoreRootDocument' in options ) {
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this.cnameIgnoreRootDocument =
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options.cnameIgnoreRootDocument !== false;
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}
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if ( 'cnameMaxTTL' in options ) {
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this.cnameMaxTTL = options.cnameMaxTTL || 120;
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}
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if ( 'cnameReplayFullURL' in options ) {
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this.cnameReplayFullURL = options.cnameReplayFullURL === true;
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}
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this.cnames.clear(); this.cnames.set('', '');
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this.cnameFlushTime = Date.now() + this.cnameMaxTTL * 60000;
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// https://github.com/uBlockOrigin/uBlock-issues/issues/911
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// Install/remove proxy detector.
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const wrohr = browser.webRequest.onHeadersReceived;
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if ( cnameUncloak === false || cnameUncloakProxied ) {
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if ( wrohr.hasListener(proxyDetector) ) {
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wrohr.removeListener(proxyDetector);
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}
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} else if ( wrohr.hasListener(proxyDetector) === false ) {
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wrohr.addListener(
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proxyDetector,
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{ urls: [ '*://*/*' ] },
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[ 'blocking' ]
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);
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}
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proxyDetectorTryCount = 32;
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}
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normalizeDetails(details) {
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if ( mustPunycode && !reAsciiHostname.test(details.url) ) {
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parsedURL.href = details.url;
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details.url = details.url.replace(
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parsedURL.hostname,
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punycode.toASCII(parsedURL.hostname)
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);
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}
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const type = details.type;
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if ( type === 'imageset' ) {
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details.type = 'image';
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return;
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}
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// https://github.com/uBlockOrigin/uBlock-issues/issues/345
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// Re-categorize an embedded object as a `sub_frame` if its
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// content type is that of a HTML document.
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if ( type === 'object' && Array.isArray(details.responseHeaders) ) {
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for ( const header of details.responseHeaders ) {
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if ( header.name.toLowerCase() === 'content-type' ) {
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if ( header.value.startsWith('text/html') ) {
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details.type = 'sub_frame';
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}
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break;
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}
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}
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}
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}
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denormalizeTypes(types) {
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if ( types.length === 0 ) {
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return Array.from(this.validTypes);
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}
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const out = new Set();
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for ( const type of types ) {
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if ( this.validTypes.has(type) ) {
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out.add(type);
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}
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if ( type === 'image' && this.validTypes.has('imageset') ) {
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out.add('imageset');
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}
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if ( type === 'sub_frame' ) {
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out.add('object');
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}
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}
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return Array.from(out);
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}
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canonicalNameFromHostname(hn) {
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const cn = this.cnames.get(hn);
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if ( cn !== undefined && cn !== '' ) {
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return cn;
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}
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}
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processCanonicalName(hn, cn, details) {
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const hnBeg = details.url.indexOf(hn);
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if ( hnBeg === -1 ) { return; }
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const oldURL = details.url;
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let newURL = oldURL.slice(0, hnBeg) + cn;
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const hnEnd = hnBeg + hn.length;
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if ( this.cnameReplayFullURL ) {
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newURL += oldURL.slice(hnEnd);
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} else {
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const pathBeg = oldURL.indexOf('/', hnEnd);
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if ( pathBeg !== -1 ) {
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newURL += oldURL.slice(hnEnd, pathBeg + 1);
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}
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}
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details.url = newURL;
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details.aliasURL = oldURL;
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return super.onBeforeSuspendableRequest(details);
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}
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recordCanonicalName(hn, record) {
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if ( (this.cnames.size & 0b111111) === 0 ) {
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const now = Date.now();
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if ( now >= this.cnameFlushTime ) {
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this.cnames.clear(); this.cnames.set('', '');
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this.cnameFlushTime = now + this.cnameMaxTTL * 60000;
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}
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}
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let cname =
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typeof record.canonicalName === 'string' &&
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record.canonicalName !== hn
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? record.canonicalName
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: '';
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if (
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cname !== '' &&
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this.cnameIgnore1stParty &&
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vAPI.domainFromHostname(cname) === vAPI.domainFromHostname(hn)
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) {
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cname = '';
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}
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if (
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cname !== '' &&
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this.cnameIgnoreList !== null &&
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this.cnameIgnoreList.test(cname)
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) {
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cname = '';
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}
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this.cnames.set(hn, cname);
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return cname;
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}
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regexFromStrList(list) {
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if (
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typeof list !== 'string' ||
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list.length === 0 ||
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list === 'unset' ||
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browser.dns instanceof Object === false
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) {
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return null;
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}
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if ( list === '*' ) {
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return /^./;
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}
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return new RegExp(
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'(?:^|\.)(?:' +
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list.trim()
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.split(/\s+/)
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.map(a => a.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'))
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.join('|') +
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')$'
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);
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}
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onBeforeSuspendableRequest(details) {
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const r = super.onBeforeSuspendableRequest(details);
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if ( cnameUncloak === false ) { return r; }
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if ( r !== undefined ) {
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if (
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r.cancel === true ||
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r.redirectUrl !== undefined ||
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this.cnameIgnoreExceptions
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) {
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return r;
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}
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}
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if (
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details.type === 'main_frame' &&
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this.cnameIgnoreRootDocument
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) {
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return;
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}
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const hn = vAPI.hostnameFromNetworkURL(details.url);
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const cname = this.cnames.get(hn);
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if ( cname === '' ) { return; }
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if ( cname !== undefined ) {
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return this.processCanonicalName(hn, cname, details);
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}
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return browser.dns.resolve(hn, [ 'canonical_name' ]).then(
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rec => {
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const cname = this.recordCanonicalName(hn, rec);
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if ( cname === '' ) { return; }
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return this.processCanonicalName(hn, cname, details);
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},
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( ) => {
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this.cnames.set(hn, '');
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}
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);
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}
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suspendOneRequest(details) {
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const pending = {
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details: Object.assign({}, details),
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resolve: undefined,
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promise: undefined
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};
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pending.promise = new Promise(resolve => {
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pending.resolve = resolve;
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});
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this.pendingRequests.push(pending);
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return pending.promise;
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}
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unsuspendAllRequests() {
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const pendingRequests = this.pendingRequests;
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this.pendingRequests = [];
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for ( const entry of pendingRequests ) {
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entry.resolve(this.onBeforeSuspendableRequest(entry.details));
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}
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}
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canSuspend() {
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return true;
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}
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};
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})();
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/******************************************************************************/
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