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/*******************************************************************************
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
*/
/* global addMessageListener, removeMessageListener, sendAsyncMessage */
// For non background pages
/******************************************************************************/
(function(self) {
'use strict';
/******************************************************************************/
var vAPI = self.vAPI = self.vAPI || {};
vAPI.firefox = true;
vAPI.sessionId = String.fromCharCode(Date.now() % 26 + 97) +
Math.random().toString(36).slice(2);
/******************************************************************************/
vAPI.setTimeout = vAPI.setTimeout || function(callback, delay) {
return setTimeout(function() { callback(); }, delay);
};
/******************************************************************************/
vAPI.shutdown = (function() {
var jobs = [];
var add = function(job) {
jobs.push(job);
};
var exec = function() {
//console.debug('Shutting down...');
var job;
while ( job = jobs.pop() ) {
job();
}
};
return {
add: add,
exec: exec
};
})();
/******************************************************************************/
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 = {
channels: {},
listeners: {},
requestId: 1,
setup: function() {
this.connector = function(msg) {
messagingConnector(JSON.parse(msg));
};
addMessageListener(this.connector);
this.channels['vAPI'] = {};
this.channels['vAPI'].listener = function(msg) {
if ( msg.cmd === 'injectScript' ) {
var details = msg.details;
if ( !details.allFrames && window !== window.top ) {
return;
}
// TODO: investigate why this happens, and if this happens
// legitimately (content scripts not injected I suspect, so
// that would make this legitimate).
// Case: open popup UI from icon in uBlock's logger
if ( typeof self.injectScript === 'function' ) {
self.injectScript(details.file);
}
}
};
},
close: function() {
if ( !this.connector ) {
return;
}
removeMessageListener();
this.connector = 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.connector ) {
vAPI.messaging.setup();
}
message = {
channelName: self._sandboxId_ + '|' + this.channelName,
msg: message
};
if ( callback ) {
message.requestId = vAPI.messaging.requestId++;
vAPI.messaging.listeners[message.requestId] = callback;
}
sendAsyncMessage('ublock0:background', message);
},
close: function() {
delete vAPI.messaging.channels[this.channelName];
}
};
return this.channels[channelName];
},
toggleListener: function({type, persisted}) {
if ( !vAPI.messaging.connector ) {
return;
}
if ( type === 'pagehide' ) {
removeMessageListener();
return;
}
if ( persisted ) {
addMessageListener(vAPI.messaging.connector);
}
}
};
window.addEventListener('pagehide', vAPI.messaging.toggleListener, true);
window.addEventListener('pageshow', vAPI.messaging.toggleListener, true);
/******************************************************************************/
// No need to have vAPI client linger around after shutdown if
// we are not a top window (because element picker can still
// be injected in top window).
if ( window !== window.top ) {
// Can anything be done?
}
/******************************************************************************/
})(this);
/******************************************************************************/
|
