mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-01 16:33:06 +01:00
b1a338681b
Not sure this can really happen, but if ever Math.random() would
return `0.9999999999999999`, the attribute name would start with
`{`, i.e. an invalid attribute name.
281 lines
8.7 KiB
JavaScript
281 lines
8.7 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-2015 The uBlock Origin authors
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Copyright (C) 2014-present 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/uBlock
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*/
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// For non-background page
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'use strict';
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/******************************************************************************/
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// https://github.com/chrisaljoudi/uBlock/issues/456
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// Skip if already injected.
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// >>>>>>>> start of HUGE-IF-BLOCK
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if (
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typeof vAPI === 'object' &&
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vAPI.randomToken instanceof Function === false
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) {
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/******************************************************************************/
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/******************************************************************************/
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vAPI.randomToken = function() {
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const n = Math.random();
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return String.fromCharCode(n * 25 + 97) +
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Math.floor(
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(0.25 + n * 0.75) * Number.MAX_SAFE_INTEGER
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).toString(36).slice(-8);
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};
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vAPI.sessionId = vAPI.randomToken();
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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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// Shutdown asynchronously, to ensure shutdown jobs are called from
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// the top context.
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self.requestIdleCallback(( ) => {
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const jobs = this.jobs.slice();
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this.jobs.length = 0;
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while ( jobs.length !== 0 ) {
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(jobs.pop())();
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}
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});
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},
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remove: function(job) {
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let 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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vAPI.messaging = {
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port: null,
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portTimer: null,
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portTimerDelay: 10000,
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extended: undefined,
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extensions: [],
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msgIdGenerator: 1,
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pending: new Map(),
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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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// https://github.com/uBlockOrigin/uBlock-issues/issues/403
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// Spurious disconnection can happen, so do not consider such events
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// as world-ending, i.e. stay around. Except for embedded frames.
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disconnectListener: function() {
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void browser.runtime.lastError;
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this.port = null;
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if ( window !== window.top ) {
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vAPI.shutdown.exec();
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} else {
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this.destroyPort();
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}
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},
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disconnectListenerBound: null,
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// 2020-09-01:
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// In Firefox, `details instanceof Object` resolves to `false` despite
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// `details` being a valid object. Consequently, falling back to use
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// `typeof details`.
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// This is an issue which surfaced when the element picker code was
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// revisited to isolate the picker dialog DOM from the page DOM.
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messageListener: function(details) {
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if ( typeof details !== 'object' || details === null ) { return; }
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// Response to specific message previously sent
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if ( details.msgId !== undefined ) {
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const resolver = this.pending.get(details.msgId);
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if ( resolver !== undefined ) {
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this.pending.delete(details.msgId);
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resolver(details.msg);
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return;
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}
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}
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// Unhandled messages
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this.extensions.every(ext => ext.canProcessMessage(details) !== true);
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},
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messageListenerBound: null,
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canDestroyPort: function() {
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return this.pending.size === 0 && (
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this.extensions.length === 0 ||
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this.extensions.every(e => e.canDestroyPort())
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);
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},
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mustDestroyPort: function() {
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if ( this.extensions.length === 0 ) { return; }
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this.extensions.forEach(e => e.mustDestroyPort());
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this.extensions.length = 0;
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},
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portPoller: function() {
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this.portTimer = null;
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if ( this.port !== null && this.canDestroyPort() ) {
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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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const port = this.port;
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if ( port !== null ) {
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port.disconnect();
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port.onMessage.removeListener(this.messageListenerBound);
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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.mustDestroyPort();
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// service pending callbacks
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if ( this.pending.size !== 0 ) {
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const pending = this.pending;
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this.pending = new Map();
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for ( const resolver of pending.values() ) {
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resolver();
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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.messageListenerBound === null ) {
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this.messageListenerBound = 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 = browser.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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// Not having a valid port at this point means the main process is
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// not available: no point keeping the content scripts alive.
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if ( this.port === null ) {
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vAPI.shutdown.exec();
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return null;
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}
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this.port.onMessage.addListener(this.messageListenerBound);
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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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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(channel, msg) {
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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 > 50 ) {
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vAPI.shutdown.exec();
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}
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const port = this.getPort();
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if ( port === null ) {
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return Promise.resolve();
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}
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const msgId = this.msgIdGenerator++;
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const promise = new Promise(resolve => {
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this.pending.set(msgId, resolve);
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});
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port.postMessage({ channel, msgId, msg });
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return promise;
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},
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// Dynamically extend capabilities.
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//
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// https://github.com/uBlockOrigin/uBlock-issues/issues/1571
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// Don't use `self` to access `vAPI`.
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extend: function() {
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if ( this.extended === undefined ) {
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this.extended = vAPI.messaging.send('vapi', {
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what: 'extendClient'
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}).then(( ) =>
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typeof vAPI === 'object' && this.extensions.length !== 0
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).catch(( ) => {
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});
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}
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return this.extended;
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},
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};
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vAPI.shutdown.add(( ) => {
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vAPI.messaging.shutdown();
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window.vAPI = undefined;
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});
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/******************************************************************************/
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/******************************************************************************/
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}
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// <<<<<<<< end of HUGE-IF-BLOCK
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/*******************************************************************************
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DO NOT:
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- Remove the following code
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- Add code beyond the following code
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Reason:
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- https://github.com/gorhill/uBlock/pull/3721
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- uBO never uses the return value from injected content scripts
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**/
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void 0;
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