uBlock/platform/firefox/vapi-client.js
2015-01-13 07:29:01 +01:00

150 lines
4.3 KiB
JavaScript

/*******************************************************************************
µBlock - a Chromium 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
*/
/* global addMessageListener, removeMessageListener, sendAsyncMessage */
// For non background pages
/******************************************************************************/
(function() {
'use strict';
/******************************************************************************/
self.vAPI = self.vAPI || {};
vAPI.firefox = true;
/******************************************************************************/
var messagingConnector = function(response) {
if ( !response ) {
return;
}
var channels = vAPI.messaging.channels;
var channel, listener;
if ( response.broadcast === true ) {
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.portName];
listener = channel && channel.listener;
}
if ( typeof listener === 'function' ) {
listener(response.msg);
}
};
/******************************************************************************/
var uniqueId = function() {
return Math.random().toString(36).slice(2);
};
/******************************************************************************/
vAPI.messaging = {
channels: {},
listeners: {},
requestId: 1,
connectorId: uniqueId(),
setup: function() {
this.connector = function(msg) {
messagingConnector(JSON.parse(msg));
};
addMessageListener(this.connectorId, this.connector);
},
close: function() {
if (this.connector) {
removeMessageListener(this.connectorId, this.connector);
this.connector = null;
this.channels = {};
this.listeners = {};
}
},
channel: function(channelName, callback) {
if ( !channelName ) {
return;
}
this.channels[channelName] = {
portName: channelName,
listener: typeof callback === 'function' ? callback : null,
send: function(message, callback) {
if ( !vAPI.messaging.connector ) {
vAPI.messaging.setup();
}
message = {
portName: vAPI.messaging.connectorId + '|' + this.portName,
msg: message
};
if ( callback ) {
message.requestId = vAPI.messaging.requestId++;
vAPI.messaging.listeners[message.requestId] = callback;
}
sendAsyncMessage('ublock:background', message);
},
close: function() {
delete vAPI.messaging.channels[this.portName];
}
};
return this.channels[channelName];
}
};
/******************************************************************************/
vAPI.canExecuteContentScript = function() {
return true;
};
/******************************************************************************/
})();
/******************************************************************************/