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/*
* This file is part of Adblock Plus <https://adblockplus.org/>,
* Copyright (C) 2006-2015 Eyeo GmbH
*
* Adblock Plus is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Adblock Plus 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 Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
*/
(function(global)
{
const Ci = Components.interfaces;
if (!global.ext)
global.ext = {};
var holder = {
get Page()
{
delete this.Page;
this.Page = (typeof require == "function" ?
require("ext_background").Page :
function() {});
return this.Page;
}
};
var getSender = global.ext._getSender = function(origin)
{
if (origin instanceof Ci.nsIDOMXULElement)
return origin.messageManager;
else if (origin instanceof Ci.nsIMessageSender)
return origin;
else
return null;
};
var MessageProxy = global.ext._MessageProxy = function(messageManager, messageTarget)
{
this._messageManager = messageManager;
this._messageTarget = messageTarget;
this._callbacks = new Map();
this._responseCallbackCounter = 0;
this._handleRequest = this._handleRequest.bind(this);
this._handleResponse = this._handleResponse.bind(this);
this._messageManager.addMessageListener("AdblockPlus:Message", this._handleRequest);
this._messageManager.addMessageListener("AdblockPlus:Response", this._handleResponse);
};
MessageProxy.prototype = {
_disconnect: function()
{
this._messageManager.removeMessageListener("AdblockPlus:Message", this._handleRequest);
this._messageManager.removeMessageListener("AdblockPlus:Response", this._handleResponse);
},
_sendResponse: function(sender, callbackId, message)
{
var response = {
callbackId: callbackId
};
if (typeof response != "undefined")
response.payload = message;
sender.sendAsyncMessage("AdblockPlus:Response", response);
},
_handleRequest: function(message)
{
var sender = getSender(message.target);
var request = message.data;
var sent = false;
var sendResponse;
if (sender && "callbackId" in request)
{
sendResponse = function(message)
{
this._sendResponse(sender, request.callbackId, message);
sent = true;
}.bind(this);
}
else
sendResponse = function() {};
var results = this._messageTarget._dispatch(request.payload, {
page: new holder.Page(sender)
}, sendResponse);
if (!sent && results.indexOf(true) == -1)
sendResponse(undefined);
},
_handleResponse: function(message)
{
var response = message.data;
var callback = this._callbacks.get(response.callbackId);
if (callback)
{
this._callbacks.delete(response.callbackId);
if ("payload" in response)
callback(response.payload);
}
},
sendMessage: function(message, responseCallback)
{
if (!(this._messageManager instanceof Ci.nsIMessageSender))
throw new Error("Not implemented");
var request = {
payload: message
};
if (responseCallback)
{
request.callbackId = ++this._responseCallbackCounter;
this._callbacks.set(request.callbackId, responseCallback);
}
this._messageManager.sendAsyncMessage("AdblockPlus:Message", request);
}
};
var EventTarget = global.ext._EventTarget = function()
{
this._listeners = [];
};
EventTarget.prototype = {
addListener: function(listener)
{
if (this._listeners.indexOf(listener) == -1)
this._listeners.push(listener);
},
removeListener: function(listener)
{
var idx = this._listeners.indexOf(listener);
if (idx != -1)
this._listeners.splice(idx, 1);
},
_dispatch: function()
{
var results = [];
for (var i = 0; i < this._listeners.length; i++)
results.push(this._listeners[i].apply(null, arguments));
return results;
}
};
if (typeof exports == "object")
exports = global.ext;
})(this);
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