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/**
* socket.io
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
(function (exports, io) {
/**
* Expose constructor.
*/
exports.flashsocket = Flashsocket;
/**
* The FlashSocket transport. This is a API wrapper for the HTML5 WebSocket
* specification. It uses a .swf file to communicate with the server. If you want
* to serve the .swf file from a other server than where the Socket.IO script is
* coming from you need to use the insecure version of the .swf. More information
* about this can be found on the github page.
*
* @constructor
* @extends {io.Transport.websocket}
* @api public
*/
function Flashsocket () {
io.Transport.websocket.apply(this, arguments);
};
/**
* Inherits from Transport.
*/
io.util.inherit(Flashsocket, io.Transport.websocket);
/**
* Transport name
*
* @api public
*/
Flashsocket.prototype.name = 'flashsocket';
/**
* Disconnect the established `FlashSocket` connection. This is done by adding a
* new task to the FlashSocket. The rest will be handled off by the `WebSocket`
* transport.
*
* @returns {Transport}
* @api public
*/
Flashsocket.prototype.open = function () {
var self = this
, args = arguments;
WebSocket.__addTask(function () {
io.Transport.websocket.prototype.open.apply(self, args);
});
return this;
};
/**
* Sends a message to the Socket.IO server. This is done by adding a new
* task to the FlashSocket. The rest will be handled off by the `WebSocket`
* transport.
*
* @returns {Transport}
* @api public
*/
Flashsocket.prototype.send = function () {
var self = this, args = arguments;
WebSocket.__addTask(function () {
io.Transport.websocket.prototype.send.apply(self, args);
});
return this;
};
/**
* Disconnects the established `FlashSocket` connection.
*
* @returns {Transport}
* @api public
*/
Flashsocket.prototype.close = function () {
WebSocket.__tasks.length = 0;
io.Transport.websocket.prototype.close.call(this);
return this;
};
/**
* The WebSocket fall back needs to append the flash container to the body
* element, so we need to make sure we have access to it. Or defer the call
* until we are sure there is a body element.
*
* @param {Socket} socket The socket instance that needs a transport
* @param {Function} fn The callback
* @api private
*/
Flashsocket.prototype.ready = function (socket, fn) {
function init () {
var options = socket.options
, port = options['flash policy port']
, path = [
'http' + (options.secure ? 's' : '') + ':/'
, options.host + ':' + options.port
, options.resource
, 'static/flashsocket'
, 'WebSocketMain' + (socket.isXDomain() ? 'Insecure' : '') + '.swf'
];
// Only start downloading the swf file when the checked that this browser
// actually supports it
if (!Flashsocket.loaded) {
if (typeof WEB_SOCKET_SWF_LOCATION === 'undefined') {
// Set the correct file based on the XDomain settings
WEB_SOCKET_SWF_LOCATION = path.join('/');
}
if (port !== 843) {
WebSocket.loadFlashPolicyFile('xmlsocket://' + options.host + ':' + port);
}
WebSocket.__initialize();
Flashsocket.loaded = true;
}
fn.call(self);
}
var self = this;
if (document.body) return init();
io.util.load(init);
};
/**
* Check if the FlashSocket transport is supported as it requires that the Adobe
* Flash Player plug-in version `10.0.0` or greater is installed. And also check if
* the polyfill is correctly loaded.
*
* @returns {Boolean}
* @api public
*/
Flashsocket.check = function () {
if (
typeof WebSocket == 'undefined'
|| !('__initialize' in WebSocket) || !swfobject
) return false;
return swfobject.getFlashPlayerVersion().major >= 10;
};
/**
* Check if the FlashSocket transport can be used as cross domain / cross origin
* transport. Because we can't see which type (secure or insecure) of .swf is used
* we will just return true.
*
* @returns {Boolean}
* @api public
*/
Flashsocket.xdomainCheck = function () {
return true;
};
/**
* Disable AUTO_INITIALIZATION
*/
if (typeof window != 'undefined') {
WEB_SOCKET_DISABLE_AUTO_INITIALIZATION = true;
}
/**
* Add the transport to your public io.transports array.
*
* @api private
*/
io.transports.push('flashsocket');
})(
'undefined' != typeof io ? io.Transport : module.exports
, 'undefined' != typeof io ? io : module.parent.exports
);
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