mirror of https://github.com/gorhill/uBlock.git
343 lines
10 KiB
JavaScript
343 lines
10 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium browser extension to block requests.
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Copyright (C) 2014 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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/* global chrome, µBlock */
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/******************************************************************************/
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// Start isolation from global scope
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µBlock.webRequest = (function() {
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/******************************************************************************/
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// Intercept and filter web requests.
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var onBeforeRequest = function(details) {
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//console.debug('onBeforeRequest()> "%s": %o', details.url, details);
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// Do not block behind the scene requests.
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var tabId = details.tabId;
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if ( tabId < 0 ) {
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return;
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}
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var µb = µBlock;
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var requestURL = details.url;
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var requestType = details.type;
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// Special handling for root document.
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if ( requestType === 'main_frame' && details.parentFrameId === -1 ) {
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µb.bindTabToPageStats(tabId, requestURL, 'beforeRequest');
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return;
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}
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// Commented out until (and if ever) there is a fix for:
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// https://code.google.com/p/chromium/issues/detail?id=410382
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//
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// Try to transpose generic `other` category into something more meaningful.
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if ( requestType === 'other' ) {
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requestType = µb.transposeType('other', µb.URI.set(requestURL).path);
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// https://github.com/gorhill/uBlock/issues/206
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// https://code.google.com/p/chromium/issues/detail?id=410382
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// Work around the issue of Chromium not properly setting the type for
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// `object` requests. Unclear whether this issue will be fixed, hence
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// this workaround to prevent torch-and-pitchfork mobs because ads are
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// no longer blocked in videos.
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// https://github.com/gorhill/uBlock/issues/281
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// Looks like Chrome 38 (but not 39) doesn't provide the expected request
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// header `X-Requested-With`. Sigh.
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if ( requestType === 'other' ) {
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requestType = 'object';
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}
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}
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// Lookup the page store associated with this tab id.
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var pageStore = µb.pageStoreFromTabId(tabId);
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if ( !pageStore ) {
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return;
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}
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// https://github.com/gorhill/uBlock/issues/114
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var requestContext = pageStore;
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var frameStore;
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var frameId = details.frameId;
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if ( frameId > 0 ) {
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if ( frameStore = pageStore.getFrame(frameId) ) {
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requestContext = frameStore;
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}
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}
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var result = pageStore.filterRequest(requestContext, requestType, requestURL);
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// Not blocked
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if ( pageStore.boolFromResult(result) === false ) {
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pageStore.perLoadAllowedRequestCount++;
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µb.localSettings.allowedRequestCount++;
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// https://github.com/gorhill/uBlock/issues/114
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if ( frameId > 0 && frameStore === undefined ) {
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pageStore.addFrame(frameId, requestURL);
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}
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if ( µb.userSettings.experimentalEnabled ) {
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// https://code.google.com/p/chromium/issues/detail?id=387198
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// Not all redirects will succeed, until bug above is fixed.
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var redirectURL = µb.mirrors.toURL(requestURL, true);
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if ( redirectURL !== '' ) {
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pageStore.setRequestFlags(requestURL, 0x01, 0x01);
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//console.debug('"%s" redirected to "%s..."', requestURL.slice(0, 50), redirectURL.slice(0, 50));
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return { redirectUrl: redirectURL };
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}
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}
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//console.debug('µBlock> onBeforeRequest()> ALLOW "%s" (%o)', details.url, details);
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return;
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}
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// Blocked
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pageStore.perLoadBlockedRequestCount++;
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µb.localSettings.blockedRequestCount++;
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µb.updateBadgeAsync(tabId);
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// https://github.com/gorhill/uBlock/issues/18
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// Do not use redirection, we need to block outright to be sure the request
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// will not be made. There can be no such guarantee with redirection.
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// console.debug('µBlock> onBeforeRequest()> BLOCK "%s" (%o) because "%s"', details.url, details, result);
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return { 'cancel': true };
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};
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/******************************************************************************/
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// Intercept root frame requests. This is where we identify and block popups.
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var onBeforeSendHeaders = function(details) {
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// TODO: I vaguely remember reading that when pre-fetch is enabled,
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// the tab id could be -1, despite the request not really being a
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// behind-the-scene request. If true, the test below would prevent
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// the popup blocker from working. Need to check this.
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// Do not block behind the scene requests.
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var tabId = details.tabId;
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if ( tabId < 0 ) {
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return;
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}
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// Only root document.
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if ( details.parentFrameId !== -1 ) {
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return;
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}
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var µb = µBlock;
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var requestURL = details.url;
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// Lookup the page store associated with this tab id.
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var pageStore = µb.pageStoreFromTabId(tabId);
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if ( !pageStore ) {
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// This happens under normal circumstances in Opera.
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return;
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}
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// Heuristic to determine whether we are dealing with a popup:
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// - the page store is new (it's not a reused one)
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// - the referrer is not nil
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// Can't be a popup, the tab was in use previously.
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if ( pageStore.previousPageURL !== '' ) {
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return;
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}
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var referrer = headerValue(details.requestHeaders, 'referer');
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if ( referrer === '' ) {
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return;
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}
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// TODO: I think I should test the switch of the referrer instead, not the
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// switch of the popup. If so, that would require being able to lookup
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// a page store from a URL. Have to keep in mind the same URL can appear
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// in multiple tabs.
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var result = '';
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if ( pageStore.getNetFilteringSwitch() ) {
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// https://github.com/gorhill/uBlock/issues/67
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// We need to pass the details of the page which opened this popup,
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// so that the `third-party` option works.
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// Create a synthetic context based on the referrer.
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var µburi = µb.URI;
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var referrerHostname = µburi.hostnameFromURI(referrer);
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var pageDetails = {
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pageHostname: referrerHostname,
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pageDomain: µburi.domainFromHostname(referrerHostname),
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};
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pageDetails.rootHostname = pageDetails.pageHostname;
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pageDetails.rootDomain = pageDetails.pageDomain;
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//console.debug('Referrer="%s"', referrer);
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result = µb.netFilteringEngine.matchStringExactType(pageDetails, requestURL, 'popup');
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}
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// Not blocked?
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if ( result === '' || result.slice(0, 2) === '@@' ) {
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return;
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}
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// It is a popup, block and remove the tab.
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µb.unbindTabFromPageStats(tabId);
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µb.XAL.destroyTab(tabId);
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return { 'cancel': true };
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};
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/******************************************************************************/
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// To handle `inline-script`.
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var onHeadersReceived = function(details) {
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// Only root document.
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if ( details.parentFrameId !== -1 ) {
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return;
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}
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// Do not interfere with behind-the-scene requests.
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var tabId = details.tabId;
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if ( tabId < 0 ) {
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return;
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}
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// Lookup the page store associated with this tab id.
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var µb = µBlock;
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var pageStore = µb.pageStoreFromTabId(tabId);
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if ( !pageStore ) {
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return;
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}
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var result = '';
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if ( pageStore.getNetFilteringSwitch() ) {
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result = µb.netFilteringEngine.matchStringExactType(pageStore, details.url, 'inline-script');
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}
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// Not blocked?
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if ( result === '' || result.slice(0, 2) === '@@' ) {
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return;
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}
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// Record request
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if ( result !== '' ) {
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pageStore.recordResult('script', details.url, result);
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}
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// Blocked
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pageStore.perLoadBlockedRequestCount++;
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µb.localSettings.blockedRequestCount++;
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µb.updateBadgeAsync(tabId);
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details.responseHeaders.push({
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'name': 'Content-Security-Policy',
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'value': "script-src 'unsafe-eval' *"
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});
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return { 'responseHeaders': details.responseHeaders };
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};
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/******************************************************************************/
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var headerValue = function(headers, name) {
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var i = headers.length;
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while ( i-- ) {
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if ( headers[i].name.toLowerCase() === name ) {
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return headers[i].value;
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}
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}
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return '';
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};
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/******************************************************************************/
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chrome.webRequest.onBeforeRequest.addListener(
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//function(details) {
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// quickProfiler.start('onBeforeRequest');
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// var r = onBeforeRequest(details);
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// quickProfiler.stop();
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// return r;
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//},
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onBeforeRequest,
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{
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"urls": [
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"http://*/*",
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"https://*/*"
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],
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"types": [
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"main_frame",
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"sub_frame",
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'stylesheet',
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"script",
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"image",
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"object",
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"xmlhttprequest",
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"other"
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]
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},
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[ "blocking" ]
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);
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chrome.webRequest.onBeforeSendHeaders.addListener(
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//function(details) {
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// quickProfiler.start('onBeforeSendHeaders');
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// var r = onBeforeSendHeaders(details);
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// quickProfiler.stop();
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// return r;
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//},
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onBeforeSendHeaders,
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{
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"urls": [
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"http://*/*",
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"https://*/*"
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],
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"types": [
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"main_frame"
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]
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},
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[ "blocking", "requestHeaders" ]
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);
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chrome.webRequest.onHeadersReceived.addListener(
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onHeadersReceived,
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{
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"urls": [
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"http://*/*",
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"https://*/*"
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],
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"types": [
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"main_frame"
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]
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},
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[ "blocking", "responseHeaders" ]
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);
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console.log('µBlock> Beginning to intercept net requests at %s', (new Date()).toISOString());
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/******************************************************************************/
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})();
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/******************************************************************************/
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