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548 lines
17 KiB
JavaScript
548 lines
17 KiB
JavaScript
/*******************************************************************************
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µMatrix - a Chromium browser extension to black/white list requests.
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Copyright (C) 2013 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/uMatrix
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*/
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/* global µMatrix */
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// rhill 2013-12-14: the whole cookie management has been rewritten so as
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// to avoid having to call chrome API whenever a single cookie changes, and
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// to record cookie for a web page *only* when its value changes.
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// https://github.com/gorhill/httpswitchboard/issues/79
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/******************************************************************************/
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// Isolate from global namespace
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// Use cached-context approach rather than object-based approach, as details
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// of the implementation do not need to be visible
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µMatrix.cookieHunter = (function() {
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/******************************************************************************/
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var µm = µMatrix;
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var recordPageCookiesQueue = {};
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var removePageCookiesQueue = {};
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var removeCookieQueue = {};
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var cookieDict = {};
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var cookieEntryJunkyard = [];
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/******************************************************************************/
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var CookieEntry = function(cookie) {
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this.set(cookie);
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};
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CookieEntry.prototype.set = function(cookie) {
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this.secure = cookie.secure;
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this.session = cookie.session;
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this.anySubdomain = cookie.domain.charAt(0) === '.';
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this.hostname = this.anySubdomain ? cookie.domain.slice(1) : cookie.domain;
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this.domain = µm.URI.domainFromHostname(this.hostname) || this.hostname;
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this.path = cookie.path;
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this.name = cookie.name;
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this.value = cookie.value;
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this.tstamp = Date.now();
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this.usedOn = {};
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return this;
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};
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// Release anything which may consume too much memory
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CookieEntry.prototype.unset = function() {
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this.hostname = '';
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this.domain = '';
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this.path = '';
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this.name = '';
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this.value = '';
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this.usedOn = {};
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return this;
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};
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/******************************************************************************/
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var addCookieToDict = function(cookie) {
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var cookieKey = cookieKeyFromCookie(cookie);
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if ( cookieDict.hasOwnProperty(cookieKey) === false ) {
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var cookieEntry = cookieEntryJunkyard.pop();
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if ( cookieEntry ) {
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cookieEntry.set(cookie);
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} else {
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cookieEntry = new CookieEntry(cookie);
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}
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cookieDict[cookieKey] = cookieEntry;
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}
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return cookieDict[cookieKey];
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};
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/******************************************************************************/
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var addCookiesToDict = function(cookies) {
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var i = cookies.length;
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while ( i-- ) {
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addCookieToDict(cookies[i]);
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}
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};
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/******************************************************************************/
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var removeCookieFromDict = function(cookieKey) {
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if ( cookieDict.hasOwnProperty(cookieKey) === false ) {
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return false;
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}
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var cookieEntry = cookieDict[cookieKey];
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delete cookieDict[cookieKey];
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if ( cookieEntryJunkyard.length < 25 ) {
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cookieEntryJunkyard.push(cookieEntry.unset());
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}
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// console.log('cookies.js/removeCookieFromDict()> removed cookie key "%s"', cookieKey);
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return true;
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};
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/******************************************************************************/
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var cookieKeyBuilder = [
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'', // 0 = scheme
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'://',
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'', // 2 = domain
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'', // 3 = path
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'{',
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'', // 5 = persistent or session
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'-cookie:',
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'', // 7 = name
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'}'
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];
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var cookieKeyFromCookie = function(cookie) {
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var cb = cookieKeyBuilder;
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cb[0] = cookie.secure ? 'https' : 'http';
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cb[2] = cookie.domain.charAt(0) === '.' ? cookie.domain.slice(1) : cookie.domain;
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cb[3] = cookie.path;
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cb[5] = cookie.session ? 'session' : 'persistent';
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cb[7] = cookie.name;
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return cb.join('');
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};
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var cookieKeyFromCookieURL = function(url, type, name) {
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var µmuri = µm.URI.set(url);
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var cb = cookieKeyBuilder;
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cb[0] = µmuri.scheme;
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cb[2] = µmuri.hostname;
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cb[3] = µmuri.path;
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cb[5] = type;
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cb[7] = name;
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return cb.join('');
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};
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/******************************************************************************/
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var cookieEntryFromCookie = function(cookie) {
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return cookieDict[cookieKeyFromCookie(cookie)];
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};
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/******************************************************************************/
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var cookieURLFromCookieEntry = function(entry) {
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if ( !entry ) {
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return '';
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}
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return (entry.secure ? 'https://' : 'http://') + entry.hostname + entry.path;
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};
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/******************************************************************************/
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var cookieMatchDomains = function(cookieKey, allHostnamesString) {
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var cookieEntry = cookieDict[cookieKey];
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if ( !cookieEntry ) {
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return false;
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}
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if ( allHostnamesString.indexOf(' ' + cookieEntry.hostname + ' ') < 0 ) {
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if ( !cookieEntry.anySubdomain ) {
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return false;
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}
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if ( allHostnamesString.indexOf('.' + cookieEntry.hostname + ' ') < 0 ) {
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return false;
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}
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}
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return true;
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};
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/******************************************************************************/
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// Look for cookies to record for a specific web page
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var recordPageCookiesAsync = function(pageStats) {
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// Store the page stats objects so that it doesn't go away
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// before we handle the job.
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// rhill 2013-10-19: pageStats could be nil, for example, this can
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// happens if a file:// ... makes an xmlHttpRequest
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if ( !pageStats ) {
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return;
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}
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var pageURL = µm.pageUrlFromPageStats(pageStats);
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recordPageCookiesQueue[pageURL] = pageStats;
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µm.asyncJobs.add(
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'cookieHunterPageRecord',
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null,
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processPageRecordQueue,
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1000,
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false
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);
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};
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/******************************************************************************/
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var cookieLogEntryBuilder = [
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'',
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'{',
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'',
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'_cookie:',
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'',
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'}'
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];
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var recordPageCookie = function(pageStore, cookieKey) {
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var cookieEntry = cookieDict[cookieKey];
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var block = µm.mustBlock(pageStore.pageHostname, cookieEntry.hostname, 'cookie');
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cookieLogEntryBuilder[0] = cookieURLFromCookieEntry(cookieEntry);
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cookieLogEntryBuilder[2] = cookieEntry.session ? 'session' : 'persistent';
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cookieLogEntryBuilder[4] = encodeURIComponent(cookieEntry.name);
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// rhill 2013-11-20:
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// https://github.com/gorhill/httpswitchboard/issues/60
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// Need to URL-encode cookie name
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pageStore.recordRequest(
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'cookie',
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cookieLogEntryBuilder.join(''),
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block
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);
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cookieEntry.usedOn[pageStore.pageHostname] = true;
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// rhill 2013-11-21:
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// https://github.com/gorhill/httpswitchboard/issues/65
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// Leave alone cookies from behind-the-scene requests if
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// behind-the-scene processing is disabled.
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if ( !block ) {
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return;
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}
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if ( !µm.userSettings.deleteCookies ) {
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return;
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}
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removeCookieAsync(cookieKey);
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};
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/******************************************************************************/
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// Look for cookies to potentially remove for a specific web page
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var removePageCookiesAsync = function(pageStats) {
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// Hold onto pageStats objects so that it doesn't go away
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// before we handle the job.
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// rhill 2013-10-19: pageStats could be nil, for example, this can
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// happens if a file:// ... makes an xmlHttpRequest
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if ( !pageStats ) {
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return;
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}
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var pageURL = µm.pageUrlFromPageStats(pageStats);
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removePageCookiesQueue[pageURL] = pageStats;
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µm.asyncJobs.add(
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'cookieHunterPageRemove',
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null,
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processPageRemoveQueue,
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15 * 1000,
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false
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);
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};
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/******************************************************************************/
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// Candidate for removal
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var removeCookieAsync = function(cookieKey) {
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// console.log('cookies.js/removeCookieAsync()> cookie key = "%s"', cookieKey);
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removeCookieQueue[cookieKey] = true;
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};
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/******************************************************************************/
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var chromeCookieRemove = function(url, name) {
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var callback = function(details) {
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if ( !details ) {
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return;
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}
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var cookieKey = cookieKeyFromCookieURL(details.url, 'session', details.name);
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if ( removeCookieFromDict(cookieKey) ) {
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µm.cookieRemovedCounter += 1;
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return;
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}
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cookieKey = cookieKeyFromCookieURL(details.url, 'persistent', details.name);
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if ( removeCookieFromDict(cookieKey) ) {
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µm.cookieRemovedCounter += 1;
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}
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};
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vAPI.cookies.remove({ url: url, name: name }, callback);
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};
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/******************************************************************************/
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var processPageRecordQueue = function() {
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for ( var pageURL in recordPageCookiesQueue ) {
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if ( !recordPageCookiesQueue.hasOwnProperty(pageURL) ) {
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continue;
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}
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findAndRecordPageCookies(recordPageCookiesQueue[pageURL]);
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delete recordPageCookiesQueue[pageURL];
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}
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};
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/******************************************************************************/
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var processPageRemoveQueue = function() {
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for ( var pageURL in removePageCookiesQueue ) {
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if ( !removePageCookiesQueue.hasOwnProperty(pageURL) ) {
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continue;
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}
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findAndRemovePageCookies(removePageCookiesQueue[pageURL]);
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delete removePageCookiesQueue[pageURL];
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}
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};
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/******************************************************************************/
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// Effectively remove cookies.
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var processRemoveQueue = function() {
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var userSettings = µm.userSettings;
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var deleteCookies = userSettings.deleteCookies;
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// Session cookies which timestamp is *after* tstampObsolete will
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// be left untouched
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// https://github.com/gorhill/httpswitchboard/issues/257
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var tstampObsolete = userSettings.deleteUnusedSessionCookies ?
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Date.now() - userSettings.deleteUnusedSessionCookiesAfter * 60 * 1000 :
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0;
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var srcHostnames;
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var cookieEntry;
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for ( var cookieKey in removeCookieQueue ) {
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if ( removeCookieQueue.hasOwnProperty(cookieKey) === false ) {
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continue;
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}
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delete removeCookieQueue[cookieKey];
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cookieEntry = cookieDict[cookieKey];
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// rhill 2014-05-12: Apparently this can happen. I have to
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// investigate how (A session cookie has same name as a
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// persistent cookie?)
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if ( !cookieEntry ) {
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// console.error('cookies.js > processRemoveQueue(): no cookieEntry for "%s"', cookieKey);
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continue;
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}
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// Just in case setting was changed after cookie was put in queue.
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if ( cookieEntry.session === false && deleteCookies === false ) {
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continue;
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}
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// Query scopes only if we are going to use them
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if ( srcHostnames === undefined ) {
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srcHostnames = µm.tMatrix.extractAllSourceHostnames();
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}
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// Ensure cookie is not allowed on ALL current web pages: It can
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// happen that a cookie is blacklisted on one web page while
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// being whitelisted on another (because of per-page permissions).
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if ( canRemoveCookie(cookieKey, srcHostnames) === false ) {
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// Exception: session cookie may have to be removed even though
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// they are seen as being whitelisted.
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if ( cookieEntry.session === false || cookieEntry.tstamp > tstampObsolete ) {
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continue;
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}
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}
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var url = cookieURLFromCookieEntry(cookieEntry);
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if ( !url ) {
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continue;
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}
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// console.debug('cookies.js > processRemoveQueue(): removing "%s" (age=%s min)', cookieKey, ((Date.now() - cookieEntry.tstamp) / 60000).toFixed(1));
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chromeCookieRemove(url, cookieEntry.name);
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}
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};
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/******************************************************************************/
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// Once in a while, we go ahead and clean everything that might have been
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// left behind.
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var processClean = function() {
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// Remove only some of the cookies which are candidate for removal:
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// who knows, maybe a user has 1000s of cookies sitting in his
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// browser...
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var cookieKeys = Object.keys(cookieDict);
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if ( cookieKeys.length > 25 ) {
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cookieKeys = cookieKeys.sort(function(){return Math.random() < 0.5;}).splice(0, 50);
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}
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while ( cookieKeys.length ) {
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removeCookieAsync(cookieKeys.pop());
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}
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};
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/******************************************************************************/
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var findAndRecordPageCookies = function(pageStats) {
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for ( var cookieKey in cookieDict ) {
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if ( !cookieDict.hasOwnProperty(cookieKey) ) {
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continue;
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}
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if ( cookieMatchDomains(cookieKey, pageStats.allHostnamesString) === false ) {
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continue;
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}
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recordPageCookie(pageStats, cookieKey);
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}
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};
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/******************************************************************************/
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var findAndRemovePageCookies = function(pageStats) {
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for ( var cookieKey in cookieDict ) {
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if ( !cookieDict.hasOwnProperty(cookieKey) ) {
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continue;
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}
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if ( !cookieMatchDomains(cookieKey, pageStats.allHostnamesString) ) {
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continue;
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}
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removeCookieAsync(cookieKey);
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}
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};
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/******************************************************************************/
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var canRemoveCookie = function(cookieKey, srcHostnames) {
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var cookieEntry = cookieDict[cookieKey];
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if ( !cookieEntry ) {
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return false;
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}
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var cookieHostname = cookieEntry.hostname;
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var srcHostname;
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for ( srcHostname in cookieEntry.usedOn ) {
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if ( cookieEntry.usedOn.hasOwnProperty(srcHostname) === false ) {
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continue;
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}
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if ( µm.mustAllow(srcHostname, cookieHostname, 'cookie') ) {
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return false;
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}
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}
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// Maybe there is a scope in which the cookie is 1st-party-allowed.
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// For example, if I am logged in into `github.com`, I do not want to be
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// logged out just because I did not yet open a `github.com` page after
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// re-starting the browser.
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srcHostname = cookieHostname;
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var pos;
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for (;;) {
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if ( srcHostnames.hasOwnProperty(srcHostname) ) {
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if ( µm.mustAllow(srcHostname, cookieHostname, 'cookie') ) {
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return false;
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}
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}
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if ( srcHostname === cookieEntry.domain ) {
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break;
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}
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pos = srcHostname.indexOf('.');
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if ( pos === -1 ) {
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break;
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}
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srcHostname = srcHostname.slice(pos + 1);
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}
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return true;
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};
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/******************************************************************************/
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// Listen to any change in cookieland, we will update page stats accordingly.
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vAPI.cookies.onChanged = function(changeInfo) {
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if ( changeInfo.removed ) {
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return;
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}
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var cookie = changeInfo.cookie;
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// rhill 2013-12-11: If cookie value didn't change, no need to record.
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// https://github.com/gorhill/httpswitchboard/issues/79
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var cookieKey = cookieKeyFromCookie(cookie);
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var cookieEntry = cookieDict[cookieKey];
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if ( !cookieEntry ) {
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cookieEntry = addCookieToDict(cookie);
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} else {
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cookieEntry.tstamp = Date.now();
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if ( cookie.value === cookieEntry.value ) {
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return;
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}
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cookieEntry.value = cookie.value;
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}
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// Go through all pages and update if needed, as one cookie can be used
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// by many web pages, so they need to be recorded for all these pages.
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var pageStores = µm.pageStats;
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var pageStore;
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for ( var pageURL in pageStores ) {
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if ( pageStores.hasOwnProperty(pageURL) === false ) {
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continue;
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}
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pageStore = pageStores[pageURL];
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if ( !cookieMatchDomains(cookieKey, pageStore.allHostnamesString) ) {
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continue;
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}
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recordPageCookie(pageStore, cookieKey);
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}
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};
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/******************************************************************************/
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vAPI.cookies.getAll(addCookiesToDict);
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vAPI.cookies.registerListeners();
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µm.asyncJobs.add('cookieHunterRemove', null, processRemoveQueue, 2 * 60 * 1000, true);
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µm.asyncJobs.add('cookieHunterClean', null, processClean, 10 * 60 * 1000, true);
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/******************************************************************************/
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// Expose only what is necessary
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return {
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recordPageCookies: recordPageCookiesAsync,
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removePageCookies: removePageCookiesAsync
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};
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/******************************************************************************/
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})();
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/******************************************************************************/
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