vapi-client.js (7978B) - View raw
/******************************************************************************* uBlock Origin - a comprehensive, efficient content blocker Copyright (C) 2014-2015 The uBlock Origin authors Copyright (C) 2014-present Raymond Hill This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see {http://www.gnu.org/licenses/}. Home: https://github.com/gorhill/uBlock */ // For non-background page /******************************************************************************/ // https://github.com/chrisaljoudi/uBlock/issues/456 // Skip if already injected. // >>>>>>>> start of HUGE-IF-BLOCK if ( typeof vAPI === 'object' && vAPI.randomToken instanceof Function === false ) { /******************************************************************************/ /******************************************************************************/ vAPI.randomToken = function() { const n = Math.random(); return String.fromCharCode(n * 25 + 97) + Math.floor( (0.25 + n * 0.75) * Number.MAX_SAFE_INTEGER ).toString(36).slice(-8); }; vAPI.sessionId = vAPI.randomToken(); vAPI.setTimeout = vAPI.setTimeout || self.setTimeout.bind(self); /******************************************************************************/ vAPI.shutdown = { jobs: [], add: function(job) { this.jobs.push(job); }, exec: function() { // Shutdown asynchronously, to ensure shutdown jobs are called from // the top context. self.requestIdleCallback(( ) => { const jobs = this.jobs.slice(); this.jobs.length = 0; while ( jobs.length !== 0 ) { (jobs.pop())(); } }); }, remove: function(job) { let pos; while ( (pos = this.jobs.indexOf(job)) !== -1 ) { this.jobs.splice(pos, 1); } } }; /******************************************************************************/ vAPI.messaging = { port: null, portTimer: null, portTimerDelay: 10000, msgIdGenerator: 1, pending: new Map(), waitStartTime: 0, shuttingDown: false, shutdown: function() { this.shuttingDown = true; this.destroyPort(); }, // https://github.com/uBlockOrigin/uBlock-issues/issues/403 // Spurious disconnection can happen, so do not consider such events // as world-ending, i.e. stay around. Except for embedded frames. disconnectListener: function() { void browser.runtime.lastError; this.port = null; if ( window !== window.top ) { vAPI.shutdown.exec(); } else { this.destroyPort(); } }, disconnectListenerBound: null, // 2020-09-01: // In Firefox, `details instanceof Object` resolves to `false` despite // `details` being a valid object. Consequently, falling back to use // `typeof details`. // This is an issue which surfaced when the element picker code was // revisited to isolate the picker dialog DOM from the page DOM. messageListener: function(details) { if ( typeof details !== 'object' || details === null ) { return; } if ( details.msgId === undefined ) { return; } const resolver = this.pending.get(details.msgId); if ( resolver === undefined ) { return; } this.pending.delete(details.msgId); resolver(details.msg); }, messageListenerBound: null, canDestroyPort: function() { return this.pending.size === 0; }, portPoller: function() { this.portTimer = null; if ( this.port !== null && this.canDestroyPort() ) { return this.destroyPort(); } this.portTimer = vAPI.setTimeout(this.portPollerBound, this.portTimerDelay); this.portTimerDelay = Math.min(this.portTimerDelay * 2, 60 * 60 * 1000); }, portPollerBound: null, destroyPort: function() { if ( this.portTimer !== null ) { clearTimeout(this.portTimer); this.portTimer = null; } const port = this.port; if ( port !== null ) { port.disconnect(); port.onMessage.removeListener(this.messageListenerBound); port.onDisconnect.removeListener(this.disconnectListenerBound); this.port = null; } // service pending callbacks if ( this.pending.size !== 0 ) { const pending = this.pending; this.pending = new Map(); for ( const resolver of pending.values() ) { resolver(); } } }, createPort: function() { if ( this.shuttingDown ) { return null; } if ( this.messageListenerBound === null ) { this.messageListenerBound = this.messageListener.bind(this); this.disconnectListenerBound = this.disconnectListener.bind(this); this.portPollerBound = this.portPoller.bind(this); } try { this.port = browser.runtime.connect({name: vAPI.sessionId}) || null; } catch { this.port = null; } // Not having a valid port at this point means the main process is // not available: no point keeping the content scripts alive. if ( this.port === null ) { vAPI.shutdown.exec(); return null; } this.port.onMessage.addListener(this.messageListenerBound); this.port.onDisconnect.addListener(this.disconnectListenerBound); this.portTimerDelay = 10000; if ( this.portTimer === null ) { this.portTimer = vAPI.setTimeout( this.portPollerBound, this.portTimerDelay ); } return this.port; }, getPort: function() { return this.port !== null ? this.port : this.createPort(); }, send: function(channel, msg) { // Too large a gap between the last request and the last response means // the main process is no longer reachable: memory leaks and bad // performance become a risk -- especially for long-lived, dynamic // pages. Guard against this. if ( this.pending.size > 64 ) { if ( (Date.now() - this.waitStartTime) > 60000 ) { vAPI.shutdown.exec(); } } const port = this.getPort(); if ( port === null ) { return Promise.resolve(); } if ( this.pending.size === 0 ) { this.waitStartTime = Date.now(); } const msgId = this.msgIdGenerator++; const promise = new Promise(resolve => { this.pending.set(msgId, resolve); }); port.postMessage({ channel, msgId, msg }); return promise; }, }; vAPI.shutdown.add(( ) => { vAPI.messaging.shutdown(); window.vAPI = undefined; }); /******************************************************************************/ /******************************************************************************/ } // <<<<<<<< end of HUGE-IF-BLOCK /******************************************************************************* DO NOT: - Remove the following code - Add code beyond the following code Reason: - https://github.com/gorhill/uBlock/pull/3721 - uBO never uses the return value from injected content scripts **/ void 0;