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709 lines
24 KiB
709 lines
24 KiB
/*******************************************************************************
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µMatrix - a Chromium browser extension to black/white list requests.
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Copyright (C) 2014-2016 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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/******************************************************************************/
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/******************************************************************************/
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(function() {
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'use strict';
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/******************************************************************************/
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var µm = µMatrix;
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// https://github.com/gorhill/httpswitchboard/issues/303
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// Some kind of trick going on here:
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// Any scheme other than 'http' and 'https' is remapped into a fake
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// URL which trick the rest of µMatrix into being able to process an
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// otherwise unmanageable scheme. µMatrix needs web page to have a proper
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// hostname to work properly, so just like the 'behind-the-scene'
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// fake domain name, we map unknown schemes into a fake '{scheme}-scheme'
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// hostname. This way, for a specific scheme you can create scope with
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// rules which will apply only to that scheme.
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/******************************************************************************/
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/******************************************************************************/
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µm.normalizePageURL = function(tabId, pageURL) {
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if ( vAPI.isBehindTheSceneTabId(tabId) ) {
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return 'http://' + this.behindTheSceneScope + '/';
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}
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// If the URL is that of our "blocked page" document, return the URL of
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// the blocked page.
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if ( pageURL.lastIndexOf(vAPI.getURL('main-blocked.html'), 0) === 0 ) {
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var matches = /main-blocked\.html\?details=([^&]+)/.exec(pageURL);
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if ( matches && matches.length === 2 ) {
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try {
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var details = JSON.parse(atob(matches[1]));
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pageURL = details.url;
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} catch (e) {
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}
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}
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}
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var uri = this.URI.set(pageURL);
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var scheme = uri.scheme;
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if ( scheme === 'https' || scheme === 'http' ) {
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return uri.normalizedURI();
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}
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var fakeHostname = scheme + '-scheme';
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if ( uri.hostname !== '' ) {
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fakeHostname = uri.hostname + '.' + fakeHostname;
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} else if ( scheme === 'about' ) {
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fakeHostname = uri.path + '.' + fakeHostname;
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}
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return 'http://' + fakeHostname + '/';
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};
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/******************************************************************************/
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/******************************************************************************
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To keep track from which context *exactly* network requests are made. This is
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often tricky for various reasons, and the challenge is not specific to one
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browser.
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The time at which a URL is assigned to a tab and the time when a network
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request for a root document is made must be assumed to be unrelated: it's all
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asynchronous. There is no guaranteed order in which the two events are fired.
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Also, other "anomalies" can occur:
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- a network request for a root document is fired without the corresponding
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tab being really assigned a new URL
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<https://github.com/chrisaljoudi/uBlock/issues/516>
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- a network request for a secondary resource is labeled with a tab id for
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which no root document was pulled for that tab.
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<https://github.com/chrisaljoudi/uBlock/issues/1001>
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- a network request for a secondary resource is made without the root
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document to which it belongs being formally bound yet to the proper tab id,
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causing a bad scope to be used for filtering purpose.
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<https://github.com/chrisaljoudi/uBlock/issues/1205>
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<https://github.com/chrisaljoudi/uBlock/issues/1140>
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So the solution here is to keep a lightweight data structure which only
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purpose is to keep track as accurately as possible of which root document
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belongs to which tab. That's the only purpose, and because of this, there are
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no restrictions for when the URL of a root document can be associated to a tab.
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Before, the PageStore object was trying to deal with this, but it had to
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enforce some restrictions so as to not descend into one of the above issues, or
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other issues. The PageStore object can only be associated with a tab for which
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a definitive navigation event occurred, because it collects information about
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what occurred in the tab (for example, the number of requests blocked for a
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page).
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The TabContext objects do not suffer this restriction, and as a result they
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offer the most reliable picture of which root document URL is really associated
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to which tab. Moreover, the TabObject can undo an association from a root
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document, and automatically re-associate with the next most recent. This takes
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care of <https://github.com/chrisaljoudi/uBlock/issues/516>.
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The PageStore object no longer cache the various information about which
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root document it is currently bound. When it needs to find out, it will always
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defer to the TabContext object, which will provide the real answer. This takes
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case of <https://github.com/chrisaljoudi/uBlock/issues/1205>. In effect, the
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master switch and dynamic filtering rules can be evaluated now properly even
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in the absence of a PageStore object, this was not the case before.
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Also, the TabContext object will try its best to find a good candidate root
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document URL for when none exists. This takes care of
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<https://github.com/chrisaljoudi/uBlock/issues/1001>.
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The TabContext manager is self-contained, and it takes care to properly
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housekeep itself.
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*/
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µm.tabContextManager = (function() {
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var tabContexts = Object.create(null);
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// https://github.com/chrisaljoudi/uBlock/issues/1001
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// This is to be used as last-resort fallback in case a tab is found to not
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// be bound while network requests are fired for the tab.
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var mostRecentRootDocURL = '';
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var mostRecentRootDocURLTimestamp = 0;
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var gcPeriod = 31 * 60 * 1000; // every 31 minutes
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// A pushed entry is removed from the stack unless it is committed with
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// a set time.
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var StackEntry = function(url, commit) {
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this.url = url;
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this.committed = commit;
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this.tstamp = Date.now();
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};
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var TabContext = function(tabId) {
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this.tabId = tabId;
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this.stack = [];
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this.rawURL =
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this.normalURL =
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this.scheme =
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this.rootHostname =
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this.rootDomain = '';
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this.secure = false;
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this.commitTimer = null;
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this.gcTimer = null;
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tabContexts[tabId] = this;
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};
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TabContext.prototype.destroy = function() {
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if ( vAPI.isBehindTheSceneTabId(this.tabId) ) {
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return;
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}
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if ( this.gcTimer !== null ) {
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clearTimeout(this.gcTimer);
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this.gcTimer = null;
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}
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delete tabContexts[this.tabId];
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};
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TabContext.prototype.onTab = function(tab) {
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if ( tab ) {
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this.gcTimer = vAPI.setTimeout(this.onGC.bind(this), gcPeriod);
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} else {
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this.destroy();
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}
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};
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TabContext.prototype.onGC = function() {
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this.gcTimer = null;
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if ( vAPI.isBehindTheSceneTabId(this.tabId) ) {
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return;
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}
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vAPI.tabs.get(this.tabId, this.onTab.bind(this));
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};
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// https://github.com/gorhill/uBlock/issues/248
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// Stack entries have to be committed to stick. Non-committed stack
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// entries are removed after a set delay.
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TabContext.prototype.onCommit = function() {
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if ( vAPI.isBehindTheSceneTabId(this.tabId) ) {
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return;
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}
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this.commitTimer = null;
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// Remove uncommitted entries at the top of the stack.
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var i = this.stack.length;
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while ( i-- ) {
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if ( this.stack[i].committed ) {
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break;
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}
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}
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// https://github.com/gorhill/uBlock/issues/300
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// If no committed entry was found, fall back on the bottom-most one
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// as being the committed one by default.
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if ( i === -1 && this.stack.length !== 0 ) {
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this.stack[0].committed = true;
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i = 0;
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}
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i += 1;
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if ( i < this.stack.length ) {
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this.stack.length = i;
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this.update();
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µm.bindTabToPageStats(this.tabId, 'newURL');
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}
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};
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// This takes care of orphanized tab contexts. Can't be started for all
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// contexts, as the behind-the-scene context is permanent -- so we do not
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// want to flush it.
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TabContext.prototype.autodestroy = function() {
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if ( vAPI.isBehindTheSceneTabId(this.tabId) ) {
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return;
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}
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this.gcTimer = vAPI.setTimeout(this.onGC.bind(this), gcPeriod);
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};
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// Update just force all properties to be updated to match the most recent
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// root URL.
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TabContext.prototype.update = function() {
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if ( this.stack.length === 0 ) {
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this.rawURL = this.normalURL = this.scheme =
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this.rootHostname = this.rootDomain = '';
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this.secure = false;
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return;
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}
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this.rawURL = this.stack[this.stack.length - 1].url;
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this.normalURL = µm.normalizePageURL(this.tabId, this.rawURL);
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this.scheme = µm.URI.schemeFromURI(this.rawURL);
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this.rootHostname = µm.URI.hostnameFromURI(this.normalURL);
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this.rootDomain = µm.URI.domainFromHostname(this.rootHostname) || this.rootHostname;
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this.secure = µm.URI.isSecureScheme(this.scheme);
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};
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// Called whenever a candidate root URL is spotted for the tab.
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TabContext.prototype.push = function(url, context) {
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if ( vAPI.isBehindTheSceneTabId(this.tabId) ) { return; }
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var committed = context !== undefined;
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var count = this.stack.length;
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var topEntry = this.stack[count - 1];
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if ( topEntry && topEntry.url === url ) {
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if ( committed ) {
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topEntry.committed = true;
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}
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return;
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}
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if ( this.commitTimer !== null ) {
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clearTimeout(this.commitTimer);
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}
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if ( committed ) {
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this.stack = [new StackEntry(url, true)];
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} else {
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this.stack.push(new StackEntry(url));
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this.commitTimer = vAPI.setTimeout(this.onCommit.bind(this), 1000);
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}
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this.update();
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µm.bindTabToPageStats(this.tabId, context);
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};
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// These are to be used for the API of the tab context manager.
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var push = function(tabId, url, context) {
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var entry = tabContexts[tabId];
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if ( entry === undefined ) {
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entry = new TabContext(tabId);
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entry.autodestroy();
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}
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entry.push(url, context);
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mostRecentRootDocURL = url;
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mostRecentRootDocURLTimestamp = Date.now();
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return entry;
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};
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// Find a tab context for a specific tab. If none is found, attempt to
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// fix this. When all fail, the behind-the-scene context is returned.
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var mustLookup = function(tabId, url) {
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var entry;
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if ( url !== undefined ) {
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entry = push(tabId, url);
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} else {
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entry = tabContexts[tabId];
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}
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if ( entry !== undefined ) {
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return entry;
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}
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// https://github.com/chrisaljoudi/uBlock/issues/1025
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// Google Hangout popup opens without a root frame. So for now we will
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// just discard that best-guess root frame if it is too far in the
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// future, at which point it ceases to be a "best guess".
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if ( mostRecentRootDocURL !== '' && mostRecentRootDocURLTimestamp + 500 < Date.now() ) {
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mostRecentRootDocURL = '';
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}
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// https://github.com/chrisaljoudi/uBlock/issues/1001
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// Not a behind-the-scene request, yet no page store found for the
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// tab id: we will thus bind the last-seen root document to the
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// unbound tab. It's a guess, but better than ending up filtering
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// nothing at all.
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if ( mostRecentRootDocURL !== '' ) {
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return push(tabId, mostRecentRootDocURL);
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}
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// If all else fail at finding a page store, re-categorize the
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// request as behind-the-scene. At least this ensures that ultimately
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// the user can still inspect/filter those net requests which were
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// about to fall through the cracks.
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// Example: Chromium + case #12 at
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// http://raymondhill.net/ublock/popup.html
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return tabContexts[vAPI.noTabId];
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};
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var lookup = function(tabId) {
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return tabContexts[tabId] || null;
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};
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// Behind-the-scene tab context
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(function() {
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var entry = new TabContext(vAPI.noTabId);
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entry.stack.push(new StackEntry('', true));
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entry.rawURL = '';
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entry.normalURL = µm.normalizePageURL(entry.tabId);
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entry.rootHostname = µm.URI.hostnameFromURI(entry.normalURL);
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entry.rootDomain = µm.URI.domainFromHostname(entry.rootHostname) || entry.rootHostname;
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})();
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// https://github.com/gorhill/uMatrix/issues/513
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// Force a badge update here, it could happen that all the subsequent
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// network requests are already in the page store, which would cause
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// the badge to no be updated for these network requests.
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vAPI.tabs.onNavigation = function(details) {
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var tabId = details.tabId;
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if ( vAPI.isBehindTheSceneTabId(tabId) ) { return; }
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push(tabId, details.url, 'newURL');
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µm.updateBadgeAsync(tabId);
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};
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// https://github.com/gorhill/uMatrix/issues/872
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// `changeInfo.url` may not always be available (Firefox).
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vAPI.tabs.onUpdated = function(tabId, changeInfo, tab) {
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if ( vAPI.isBehindTheSceneTabId(tabId) ) { return; }
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if ( typeof tab.url !== 'string' || tab.url === '' ) { return; }
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var url = changeInfo.url || tab.url;
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if ( url ) {
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push(tabId, url, 'updateURL');
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}
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};
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vAPI.tabs.onClosed = function(tabId) {
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µm.unbindTabFromPageStats(tabId);
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var entry = tabContexts[tabId];
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if ( entry instanceof TabContext ) {
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entry.destroy();
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}
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};
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return {
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push: push,
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lookup: lookup,
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mustLookup: mustLookup
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};
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})();
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vAPI.tabs.registerListeners();
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/******************************************************************************/
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/******************************************************************************/
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// Create an entry for the tab if it doesn't exist
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µm.bindTabToPageStats = function(tabId, context) {
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this.updateBadgeAsync(tabId);
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// Do not create a page store for URLs which are of no interests
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// Example: dev console
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var tabContext = this.tabContextManager.lookup(tabId);
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if ( tabContext === null ) {
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throw new Error('Unmanaged tab id: ' + tabId);
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}
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// rhill 2013-11-24: Never ever rebind behind-the-scene
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// virtual tab.
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// https://github.com/gorhill/httpswitchboard/issues/67
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if ( vAPI.isBehindTheSceneTabId(tabId) ) {
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return this.pageStores[tabId];
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}
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var normalURL = tabContext.normalURL;
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var pageStore = this.pageStores[tabId] || null;
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// The previous page URL, if any, associated with the tab
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if ( pageStore !== null ) {
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// No change, do not rebind
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if ( pageStore.pageUrl === normalURL ) {
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return pageStore;
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}
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// https://github.com/gorhill/uMatrix/issues/37
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// Just rebind whenever possible: the URL changed, but the document
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// maybe is the same.
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// Example: Google Maps, Github
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// https://github.com/gorhill/uMatrix/issues/72
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// Need to double-check that the new scope is same as old scope
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if ( context === 'updateURL' && pageStore.pageHostname === tabContext.rootHostname ) {
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pageStore.rawURL = tabContext.rawURL;
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pageStore.normalURL = normalURL;
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this.updateTitle(tabId);
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this.pageStoresToken = Date.now();
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return pageStore;
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}
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// We won't be reusing this page store.
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this.unbindTabFromPageStats(tabId);
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}
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// Try to resurrect first.
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pageStore = this.resurrectPageStore(tabId, normalURL);
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if ( pageStore === null ) {
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pageStore = this.pageStoreFactory(tabContext);
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}
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this.pageStores[tabId] = pageStore;
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this.updateTitle(tabId);
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this.pageStoresToken = Date.now();
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// console.debug('tab.js > bindTabToPageStats(): dispatching traffic in tab id %d to page store "%s"', tabId, pageUrl);
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return pageStore;
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};
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/******************************************************************************/
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µm.unbindTabFromPageStats = function(tabId) {
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// Never unbind behind-the-scene page store.
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if ( vAPI.isBehindTheSceneTabId(tabId) ) {
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return;
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}
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var pageStore = this.pageStores[tabId] || null;
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if ( pageStore === null ) {
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return;
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}
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delete this.pageStores[tabId];
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this.pageStoresToken = Date.now();
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if ( pageStore.incinerationTimer ) {
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clearTimeout(pageStore.incinerationTimer);
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pageStore.incinerationTimer = null;
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}
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if ( this.pageStoreCemetery.hasOwnProperty(tabId) === false ) {
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this.pageStoreCemetery[tabId] = {};
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}
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var pageStoreCrypt = this.pageStoreCemetery[tabId];
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var pageURL = pageStore.pageUrl;
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pageStoreCrypt[pageURL] = pageStore;
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pageStore.incinerationTimer = vAPI.setTimeout(
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this.incineratePageStore.bind(this, tabId, pageURL),
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4 * 60 * 1000
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);
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};
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/******************************************************************************/
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µm.resurrectPageStore = function(tabId, pageURL) {
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if ( this.pageStoreCemetery.hasOwnProperty(tabId) === false ) {
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return null;
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}
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var pageStoreCrypt = this.pageStoreCemetery[tabId];
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if ( pageStoreCrypt.hasOwnProperty(pageURL) === false ) {
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return null;
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}
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var pageStore = pageStoreCrypt[pageURL];
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if ( pageStore.incinerationTimer !== null ) {
|
|
clearTimeout(pageStore.incinerationTimer);
|
|
pageStore.incinerationTimer = null;
|
|
}
|
|
|
|
delete pageStoreCrypt[pageURL];
|
|
if ( Object.keys(pageStoreCrypt).length === 0 ) {
|
|
delete this.pageStoreCemetery[tabId];
|
|
}
|
|
|
|
return pageStore;
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
µm.incineratePageStore = function(tabId, pageURL) {
|
|
if ( this.pageStoreCemetery.hasOwnProperty(tabId) === false ) {
|
|
return;
|
|
}
|
|
var pageStoreCrypt = this.pageStoreCemetery[tabId];
|
|
|
|
if ( pageStoreCrypt.hasOwnProperty(pageURL) === false ) {
|
|
return;
|
|
}
|
|
|
|
var pageStore = pageStoreCrypt[pageURL];
|
|
if ( pageStore.incinerationTimer !== null ) {
|
|
clearTimeout(pageStore.incinerationTimer);
|
|
pageStore.incinerationTimer = null;
|
|
}
|
|
|
|
delete pageStoreCrypt[pageURL];
|
|
if ( Object.keys(pageStoreCrypt).length === 0 ) {
|
|
delete this.pageStoreCemetery[tabId];
|
|
}
|
|
|
|
pageStore.dispose();
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
µm.pageStoreFromTabId = function(tabId) {
|
|
return this.pageStores[tabId] || null;
|
|
};
|
|
|
|
// Never return null
|
|
µm.mustPageStoreFromTabId = function(tabId) {
|
|
return this.pageStores[tabId] || this.pageStores[vAPI.noTabId];
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
µm.forceReload = function(tabId, bypassCache) {
|
|
vAPI.tabs.reload(tabId, bypassCache);
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
// Update badge
|
|
|
|
// rhill 2013-11-09: well this sucks, I can't update icon/badge
|
|
// incrementally, as chromium overwrite the icon at some point without
|
|
// notifying me, and this causes internal cached state to be out of sync.
|
|
|
|
µm.updateBadgeAsync = (function() {
|
|
var tabIdToTimer = Object.create(null);
|
|
|
|
var updateBadge = function(tabId) {
|
|
delete tabIdToTimer[tabId];
|
|
|
|
var iconId = null;
|
|
var badgeStr = '';
|
|
|
|
var pageStore = this.pageStoreFromTabId(tabId);
|
|
if ( pageStore !== null ) {
|
|
var total = pageStore.perLoadAllowedRequestCount +
|
|
pageStore.perLoadBlockedRequestCount;
|
|
if ( total ) {
|
|
var squareSize = 19;
|
|
var greenSize = squareSize * Math.sqrt(pageStore.perLoadAllowedRequestCount / total);
|
|
iconId = greenSize < squareSize/2 ? Math.ceil(greenSize) : Math.floor(greenSize);
|
|
}
|
|
if ( this.userSettings.iconBadgeEnabled && pageStore.distinctRequestCount !== 0) {
|
|
badgeStr = this.formatCount(pageStore.distinctRequestCount);
|
|
}
|
|
}
|
|
|
|
vAPI.setIcon(tabId, iconId, badgeStr);
|
|
};
|
|
|
|
return function(tabId) {
|
|
if ( tabIdToTimer[tabId] ) {
|
|
return;
|
|
}
|
|
if ( vAPI.isBehindTheSceneTabId(tabId) ) {
|
|
return;
|
|
}
|
|
tabIdToTimer[tabId] = vAPI.setTimeout(updateBadge.bind(this, tabId), 750);
|
|
};
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
|
|
µm.updateTitle = (function() {
|
|
var tabIdToTimer = Object.create(null);
|
|
var tabIdToTryCount = Object.create(null);
|
|
var delay = 499;
|
|
|
|
var tryNoMore = function(tabId) {
|
|
delete tabIdToTryCount[tabId];
|
|
};
|
|
|
|
var tryAgain = function(tabId) {
|
|
var count = tabIdToTryCount[tabId];
|
|
if ( count === undefined ) {
|
|
return false;
|
|
}
|
|
if ( count === 1 ) {
|
|
delete tabIdToTryCount[tabId];
|
|
return false;
|
|
}
|
|
tabIdToTryCount[tabId] = count - 1;
|
|
tabIdToTimer[tabId] = vAPI.setTimeout(updateTitle.bind(µm, tabId), delay);
|
|
return true;
|
|
};
|
|
|
|
var onTabReady = function(tabId, tab) {
|
|
if ( !tab ) {
|
|
return tryNoMore(tabId);
|
|
}
|
|
var pageStore = this.pageStoreFromTabId(tabId);
|
|
if ( pageStore === null ) {
|
|
return tryNoMore(tabId);
|
|
}
|
|
if ( !tab.title && tryAgain(tabId) ) {
|
|
return;
|
|
}
|
|
// https://github.com/gorhill/uMatrix/issues/225
|
|
// Sometimes title changes while page is loading.
|
|
var settled = tab.title && tab.title === pageStore.title;
|
|
pageStore.title = tab.title || tab.url || '';
|
|
this.pageStoresToken = Date.now();
|
|
if ( settled || !tryAgain(tabId) ) {
|
|
tryNoMore(tabId);
|
|
}
|
|
};
|
|
|
|
var updateTitle = function(tabId) {
|
|
delete tabIdToTimer[tabId];
|
|
vAPI.tabs.get(tabId, onTabReady.bind(this, tabId));
|
|
};
|
|
|
|
return function(tabId) {
|
|
if ( vAPI.isBehindTheSceneTabId(tabId) ) {
|
|
return;
|
|
}
|
|
if ( tabIdToTimer[tabId] ) {
|
|
clearTimeout(tabIdToTimer[tabId]);
|
|
}
|
|
tabIdToTimer[tabId] = vAPI.setTimeout(updateTitle.bind(this, tabId), delay);
|
|
tabIdToTryCount[tabId] = 5;
|
|
};
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
|
|
// Stale page store entries janitor
|
|
// https://github.com/chrisaljoudi/uBlock/issues/455
|
|
|
|
(function() {
|
|
var cleanupPeriod = 7 * 60 * 1000;
|
|
var cleanupSampleAt = 0;
|
|
var cleanupSampleSize = 11;
|
|
|
|
var cleanup = function() {
|
|
var vapiTabs = vAPI.tabs;
|
|
var tabIds = Object.keys(µm.pageStores).sort();
|
|
var checkTab = function(tabId) {
|
|
vapiTabs.get(tabId, function(tab) {
|
|
if ( !tab ) {
|
|
µm.unbindTabFromPageStats(tabId);
|
|
}
|
|
});
|
|
};
|
|
if ( cleanupSampleAt >= tabIds.length ) {
|
|
cleanupSampleAt = 0;
|
|
}
|
|
var tabId;
|
|
var n = Math.min(cleanupSampleAt + cleanupSampleSize, tabIds.length);
|
|
for ( var i = cleanupSampleAt; i < n; i++ ) {
|
|
tabId = tabIds[i];
|
|
if ( vAPI.isBehindTheSceneTabId(tabId) ) {
|
|
continue;
|
|
}
|
|
checkTab(tabId);
|
|
}
|
|
cleanupSampleAt = n;
|
|
|
|
vAPI.setTimeout(cleanup, cleanupPeriod);
|
|
};
|
|
|
|
vAPI.setTimeout(cleanup, cleanupPeriod);
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
|
|
})();
|