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uBlock/platform/chromium/vapi-client.js

151 lines
4.3 KiB
JavaScript

/*******************************************************************************
µBlock - a browser extension to block requests.
Copyright (C) 2014 The µBlock authors
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 pages
/* global self */
/******************************************************************************/
(function(self) {
'use strict';
/******************************************************************************/
var vAPI = self.vAPI = self.vAPI || {};
var chrome = self.chrome;
// https://github.com/gorhill/uBlock/issues/456
// Already injected?
if ( vAPI.vapiClientInjected ) {
//console.debug('vapi-client.js already injected: skipping.');
return;
}
vAPI.vapiClientInjected = true;
vAPI.sessionId = String.fromCharCode(Date.now() % 25 + 97) +
Math.random().toString(36).slice(2);
vAPI.chrome = true;
/******************************************************************************/
var messagingConnector = function(response) {
if ( !response ) {
return;
}
var channels = vAPI.messaging.channels;
var channel, listener;
if ( response.broadcast === true && !response.channelName ) {
for ( channel in channels ) {
if ( channels.hasOwnProperty(channel) === false ) {
continue;
}
listener = channels[channel].listener;
if ( typeof listener === 'function' ) {
listener(response.msg);
}
}
return;
}
if ( response.requestId ) {
listener = vAPI.messaging.listeners[response.requestId];
delete vAPI.messaging.listeners[response.requestId];
delete response.requestId;
}
if ( !listener ) {
channel = channels[response.channelName];
listener = channel && channel.listener;
}
if ( typeof listener === 'function' ) {
listener(response.msg);
}
};
/******************************************************************************/
vAPI.messaging = {
port: null,
channels: {},
listeners: {},
requestId: 1,
setup: function() {
this.port = chrome.runtime.connect({name: vAPI.sessionId});
this.port.onMessage.addListener(messagingConnector);
},
close: function() {
if ( this.port === null ) {
return;
}
this.port.disconnect();
this.port.onMessage.removeListener(messagingConnector);
this.port = null;
this.channels = {};
this.listeners = {};
},
channel: function(channelName, callback) {
if ( !channelName ) {
return;
}
this.channels[channelName] = {
channelName: channelName,
listener: typeof callback === 'function' ? callback : null,
send: function(message, callback) {
if ( vAPI.messaging.port === null ) {
vAPI.messaging.setup();
}
message = {
channelName: this.channelName,
msg: message
};
if ( callback ) {
message.requestId = vAPI.messaging.requestId++;
vAPI.messaging.listeners[message.requestId] = callback;
}
vAPI.messaging.port.postMessage(message);
},
close: function() {
delete vAPI.messaging.channels[this.channelName];
}
};
return this.channels[channelName];
}
};
/******************************************************************************/
})(this);
/******************************************************************************/