mirror of https://github.com/gorhill/uBlock.git
355 lines
11 KiB
JavaScript
355 lines
11 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-2017 The uBlock Origin authors
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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 HTMLDocument, XMLDocument */
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'use strict';
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// For non background pages
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/******************************************************************************/
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(function(self) {
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/******************************************************************************/
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/******************************************************************************/
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// https://github.com/chrisaljoudi/uBlock/issues/464
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if ( document instanceof HTMLDocument === false ) {
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// https://github.com/chrisaljoudi/uBlock/issues/1528
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// A XMLDocument can be a valid HTML document.
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if (
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document instanceof XMLDocument === false ||
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document.createElement('div') instanceof HTMLDivElement === false
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) {
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return;
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}
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}
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// https://github.com/gorhill/uBlock/issues/1124
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// Looks like `contentType` is on track to be standardized:
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// https://dom.spec.whatwg.org/#concept-document-content-type
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// https://forums.lanik.us/viewtopic.php?f=64&t=31522
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// Skip text/plain documents.
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var contentType = document.contentType || '';
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if ( /^image\/|^text\/plain/.test(contentType) ) {
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return;
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}
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/******************************************************************************/
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// https://bugs.chromium.org/p/project-zero/issues/detail?id=1225&desc=6#c10
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if ( !self.vAPI || self.vAPI.uBO !== true ) {
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self.vAPI = { uBO: true };
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}
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var vAPI = self.vAPI;
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var chrome = self.chrome;
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// https://github.com/chrisaljoudi/uBlock/issues/456
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// Already injected?
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if ( vAPI.sessionId ) {
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return;
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}
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/******************************************************************************/
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vAPI.randomToken = function() {
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return String.fromCharCode(Date.now() % 26 + 97) +
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Math.floor(Math.random() * 982451653 + 982451653).toString(36);
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};
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vAPI.sessionId = vAPI.randomToken();
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vAPI.chrome = true;
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vAPI.setTimeout = vAPI.setTimeout || self.setTimeout.bind(self);
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/******************************************************************************/
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vAPI.shutdown = {
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jobs: [],
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add: function(job) {
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this.jobs.push(job);
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},
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exec: function() {
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var job;
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while ( (job = this.jobs.pop()) ) {
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job();
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}
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},
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remove: function(job) {
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var pos;
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while ( (pos = this.jobs.indexOf(job)) !== -1 ) {
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this.jobs.splice(pos, 1);
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}
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}
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};
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/******************************************************************************/
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/******************************************************************************/
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vAPI.messaging = {
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port: null,
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portTimer: null,
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portTimerDelay: 10000,
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channels: Object.create(null),
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channelCount: 0,
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pending: Object.create(null),
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pendingCount: 0,
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auxProcessId: 1,
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shuttingDown: false,
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shutdown: function() {
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this.shuttingDown = true;
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this.destroyPort();
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},
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disconnectListener: function() {
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this.port = null;
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vAPI.shutdown.exec();
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},
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disconnectListenerCallback: null,
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messageListener: function(details) {
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if ( !details ) {
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return;
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}
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// Sent to all channels
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if ( details.broadcast === true && !details.channelName ) {
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for ( var channelName in this.channels ) {
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this.sendToChannelListeners(channelName, details.msg);
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}
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return;
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}
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// Response to specific message previously sent
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if ( details.auxProcessId ) {
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var listener = this.pending[details.auxProcessId];
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delete this.pending[details.auxProcessId];
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delete details.auxProcessId; // TODO: why?
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if ( listener ) {
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this.pendingCount -= 1;
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listener(details.msg);
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return;
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}
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}
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// Sent to a specific channel
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var response = this.sendToChannelListeners(details.channelName, details.msg);
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// Respond back if required
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if ( details.mainProcessId === undefined ) {
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return;
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}
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var port = this.connect();
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if ( port !== null ) {
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port.postMessage({
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mainProcessId: details.mainProcessId,
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msg: response
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});
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}
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},
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messageListenerCallback: null,
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portPoller: function() {
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this.portTimer = null;
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if (
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this.port !== null &&
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this.channelCount === 0 &&
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this.pendingCount === 0
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) {
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return this.destroyPort();
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}
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this.portTimer = vAPI.setTimeout(this.portPollerCallback, this.portTimerDelay);
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this.portTimerDelay = Math.min(this.portTimerDelay * 2, 60 * 60 * 1000);
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},
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portPollerCallback: null,
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destroyPort: function() {
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if ( this.portTimer !== null ) {
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clearTimeout(this.portTimer);
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this.portTimer = null;
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}
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var port = this.port;
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if ( port !== null ) {
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port.disconnect();
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port.onMessage.removeListener(this.messageListenerCallback);
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port.onDisconnect.removeListener(this.disconnectListenerCallback);
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this.port = null;
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}
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if ( this.channelCount !== 0 ) {
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this.channels = Object.create(null);
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this.channelCount = 0;
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}
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// service pending callbacks
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if ( this.pendingCount !== 0 ) {
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var pending = this.pending, callback;
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this.pending = Object.create(null);
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this.pendingCount = 0;
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for ( var auxId in pending ) {
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callback = pending[auxId];
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if ( typeof callback === 'function' ) {
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callback(null);
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}
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}
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}
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},
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createPort: function() {
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if ( this.shuttingDown ) {
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return null;
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}
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if ( this.messageListenerCallback === null ) {
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this.messageListenerCallback = this.messageListener.bind(this);
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this.disconnectListenerCallback = this.disconnectListener.bind(this);
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this.portPollerCallback = this.portPoller.bind(this);
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}
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try {
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this.port = chrome.runtime.connect({name: vAPI.sessionId}) || null;
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} catch (ex) {
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this.port = null;
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}
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if ( this.port !== null ) {
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this.port.onMessage.addListener(this.messageListenerCallback);
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this.port.onDisconnect.addListener(this.disconnectListenerCallback);
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}
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this.portTimerDelay = 10000;
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if ( this.portTimer === null ) {
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this.portTimer = vAPI.setTimeout(this.portPollerCallback, this.portTimerDelay);
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}
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return this.port;
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},
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connect: function() {
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return this.port !== null ? this.port : this.createPort();
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},
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send: function(channelName, message, callback) {
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this.sendTo(channelName, message, undefined, undefined, callback);
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},
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sendTo: function(channelName, message, toTabId, toChannel, callback) {
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// Too large a gap between the last request and the last response means
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// the main process is no longer reachable: memory leaks and bad
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// performance become a risk -- especially for long-lived, dynamic
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// pages. Guard against this.
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if ( this.pendingCount > 25 ) {
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vAPI.shutdown.exec();
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}
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var port = this.connect();
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if ( port === null ) {
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if ( typeof callback === 'function' ) {
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callback();
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}
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return;
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}
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var auxProcessId;
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if ( callback ) {
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auxProcessId = this.auxProcessId++;
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this.pending[auxProcessId] = callback;
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this.pendingCount += 1;
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}
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port.postMessage({
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channelName: channelName,
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auxProcessId: auxProcessId,
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toTabId: toTabId,
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toChannel: toChannel,
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msg: message
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});
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},
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addChannelListener: function(channelName, callback) {
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if ( typeof callback !== 'function' ) {
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return;
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}
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var listeners = this.channels[channelName];
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if ( listeners !== undefined && listeners.indexOf(callback) !== -1 ) {
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console.error('Duplicate listener on channel "%s"', channelName);
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return;
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}
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if ( listeners === undefined ) {
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this.channels[channelName] = [callback];
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this.channelCount += 1;
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} else {
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listeners.push(callback);
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}
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this.connect();
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},
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removeChannelListener: function(channelName, callback) {
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if ( typeof callback !== 'function' ) {
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return;
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}
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var listeners = this.channels[channelName];
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if ( listeners === undefined ) {
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return;
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}
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var pos = listeners.indexOf(callback);
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if ( pos === -1 ) {
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console.error('Listener not found on channel "%s"', channelName);
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return;
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}
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listeners.splice(pos, 1);
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if ( listeners.length === 0 ) {
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delete this.channels[channelName];
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this.channelCount -= 1;
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}
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},
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removeAllChannelListeners: function(channelName) {
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var listeners = this.channels[channelName];
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if ( listeners === undefined ) {
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return;
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}
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delete this.channels[channelName];
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this.channelCount -= 1;
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},
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sendToChannelListeners: function(channelName, msg) {
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var listeners = this.channels[channelName];
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if ( listeners === undefined ) { return; }
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listeners = listeners.slice(0);
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var response;
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for ( var listener of listeners ) {
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response = listener(msg);
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if ( response !== undefined ) { break; }
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}
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return response;
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}
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};
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/******************************************************************************/
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vAPI.shutdown.add(function() {
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vAPI.messaging.shutdown();
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delete window.vAPI;
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});
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// https://www.youtube.com/watch?v=rT5zCHn0tsg
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// https://www.youtube.com/watch?v=E-jS4e3zacI
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/******************************************************************************/
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/******************************************************************************/
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})(this);
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/******************************************************************************/
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