mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-10 09:07:54 +01:00
150 lines
4.3 KiB
JavaScript
150 lines
4.3 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium 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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/* global addMessageListener, removeMessageListener, sendAsyncMessage */
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// For non background pages
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/******************************************************************************/
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(function() {
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'use strict';
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/******************************************************************************/
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self.vAPI = self.vAPI || {};
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vAPI.firefox = true;
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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 ) {
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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.portName];
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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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var uniqueId = function() {
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return Math.random().toString(36).slice(2);
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};
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/******************************************************************************/
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vAPI.messaging = {
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channels: {},
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listeners: {},
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requestId: 1,
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connectorId: uniqueId(),
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setup: function() {
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this.connector = function(msg) {
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messagingConnector(JSON.parse(msg));
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};
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addMessageListener(this.connectorId, this.connector);
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},
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close: function() {
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if (this.connector) {
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removeMessageListener(this.connectorId, this.connector);
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this.connector = null;
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this.channels = {};
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this.listeners = {};
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}
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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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portName: 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.connector ) {
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vAPI.messaging.setup();
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}
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message = {
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portName: vAPI.messaging.connectorId + '|' + this.portName,
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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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sendAsyncMessage('ublock:background', message);
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},
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close: function() {
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delete vAPI.messaging.channels[this.portName];
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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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vAPI.canExecuteContentScript = function() {
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return true;
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};
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/******************************************************************************/
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})();
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/******************************************************************************/
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