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/*******************************************************************************
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uMatrix - a browser extension to block requests.
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Copyright (C) 2014-2017 The uMatrix/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/uMatrix
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*/
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// For non background pages
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'use strict';
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/******************************************************************************/
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(function(self) {
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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 === undefined || self.vAPI.uMatrix !== true ) {
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self.vAPI = { uMatrix: 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.vapiClientInjected ) {
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//console.debug('vapi-client.js already injected: skipping.');
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return;
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}
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vAPI.vapiClientInjected = true;
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vAPI.sessionId = String.fromCharCode(Date.now() % 26 + 97) +
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Math.random().toString(36).slice(2);
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vAPI.chrome = true;
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/******************************************************************************/
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vAPI.shutdown = (function() {
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var jobs = [];
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var add = function(job) {
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jobs.push(job);
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};
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var exec = function() {
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//console.debug('Shutting down...');
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var job;
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while ( (job = jobs.pop()) ) {
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job();
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}
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};
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return {
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add: add,
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exec: exec
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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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listeners: new Set(),
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pending: new Map(),
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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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disconnectListenerBound: null,
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messageListener: function(details) {
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if ( !details ) { return; }
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// Sent to all listeners
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if ( details.broadcast ) {
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this.sendToListeners(details.msg);
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return;
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}
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// Response to specific message previously sent
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var listener;
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if ( details.auxProcessId ) {
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listener = this.pending.get(details.auxProcessId);
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if ( listener !== undefined ) {
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this.pending.delete(details.auxProcessId);
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listener(details.msg);
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return;
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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.listeners.size === 0 &&
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this.pending.size === 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.portPollerBound, this.portTimerDelay);
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this.portTimerDelay = Math.min(this.portTimerDelay * 2, 60 * 60 * 1000);
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},
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portPollerBound: 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.disconnectListenerBound);
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this.port = null;
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}
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this.listeners.clear();
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// service pending callbacks
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if ( this.pending.size !== 0 ) {
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var pending = this.pending;
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this.pending = new Map();
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for ( var callback of pending.values() ) {
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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 ) { return null; }
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if ( this.messageListenerCallback === null ) {
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this.messageListenerCallback = this.messageListener.bind(this);
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this.disconnectListenerBound = this.disconnectListener.bind(this);
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this.portPollerBound = 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.disconnectListenerBound);
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this.portTimerDelay = 10000;
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if ( this.portTimer === null ) {
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this.portTimer = vAPI.setTimeout(
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this.portPollerBound,
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this.portTimerDelay
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);
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}
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}
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return this.port;
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},
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getPort: 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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// 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.pending.size > 25 ) {
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vAPI.shutdown.exec();
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}
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var port = this.getPort();
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if ( port === null ) {
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if ( typeof callback === 'function' ) { callback(); }
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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.set(auxProcessId, callback);
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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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msg: message
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});
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},
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addListener: function(listener) {
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this.listeners.add(listener);
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this.getPort();
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},
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removeListener: function(listener) {
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this.listeners.delete(listener);
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},
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removeAllListeners: function() {
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this.listeners.clear();
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},
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sendToListeners: function(msg) {
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for ( var listener of this.listeners ) {
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listener(msg);
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}
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}
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};
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/******************************************************************************/
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// No need to have vAPI client linger around after shutdown if
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// we are not a top window (because element picker can still
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// be injected in top window).
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if ( window !== window.top ) {
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vAPI.shutdown.add(function() {
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vAPI = null;
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});
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}
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/******************************************************************************/
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vAPI.setTimeout = vAPI.setTimeout || function(callback, delay) {
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setTimeout(function() { callback(); }, delay);
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};
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/******************************************************************************/
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})(this); // jshint ignore: line
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/******************************************************************************/
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