mirror of
https://github.com/gorhill/uMatrix.git
synced 2024-08-24 06:21:18 +12:00
191 lines
5.3 KiB
JavaScript
191 lines
5.3 KiB
JavaScript
/*******************************************************************************
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µBlock - a browser extension to block requests.
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Copyright (C) 2014 The µBlock 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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// For non background pages
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/******************************************************************************/
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(function(self) {
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'use strict';
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/******************************************************************************/
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var vAPI = self.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() % 25 + 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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var messagingConnector = function(response) {
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if ( !response ) {
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return;
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}
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var channels = vAPI.messaging.channels;
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var channel, listener;
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if ( response.broadcast === true && !response.channelName ) {
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for ( channel in channels ) {
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if ( channels.hasOwnProperty(channel) === false ) {
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continue;
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}
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listener = channels[channel].listener;
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if ( typeof listener === 'function' ) {
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listener(response.msg);
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}
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}
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return;
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}
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if ( response.requestId ) {
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listener = vAPI.messaging.listeners[response.requestId];
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delete vAPI.messaging.listeners[response.requestId];
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delete response.requestId;
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}
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if ( !listener ) {
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channel = channels[response.channelName];
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listener = channel && channel.listener;
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}
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if ( typeof listener === 'function' ) {
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listener(response.msg);
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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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channels: {},
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listeners: {},
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requestId: 1,
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setup: function() {
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this.port = chrome.runtime.connect({name: vAPI.sessionId});
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this.port.onMessage.addListener(messagingConnector);
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},
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close: function() {
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if ( this.port === null ) {
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return;
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}
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this.port.disconnect();
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this.port.onMessage.removeListener(messagingConnector);
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this.port = null;
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this.channels = {};
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this.listeners = {};
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},
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channel: function(channelName, callback) {
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if ( !channelName ) {
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return;
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}
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this.channels[channelName] = {
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channelName: channelName,
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listener: typeof callback === 'function' ? callback : null,
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send: function(message, callback) {
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if ( vAPI.messaging.port === null ) {
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vAPI.messaging.setup();
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}
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message = {
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channelName: this.channelName,
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msg: message
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};
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if ( callback ) {
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message.requestId = vAPI.messaging.requestId++;
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vAPI.messaging.listeners[message.requestId] = callback;
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}
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vAPI.messaging.port.postMessage(message);
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},
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close: function() {
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delete vAPI.messaging.channels[this.channelName];
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if ( Object.keys(vAPI.messaging.channels).length === 0 ) {
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vAPI.messaging.close();
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}
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}
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};
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return this.channels[channelName];
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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);
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/******************************************************************************/
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