forked from oyvindkinsey/easyXDM
/
FrameElementTransport.js
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/
FrameElementTransport.js
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/*jslint evil: true, browser: true, immed: true, passfail: true, undef: true, newcap: true*/
/*global easyXDM, window, escape, unescape, getLocation, appendQueryParameters, createFrame, debug, apply, query, whenReady, IFRAME_PREFIX*/
//
// easyXDM
// http://easyxdm.net/
// Copyright(c) 2009-2011, Øyvind Sean Kinsey, oyvind@kinsey.no.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
/**
* @class easyXDM.stack.FrameElementTransport
* FrameElementTransport is a transport class that can be used with Gecko-browser as these allow passing variables using the frameElement property.<br/>
* Security is maintained as Gecho uses Lexical Authorization to determine under which scope a function is running.
* @namespace easyXDM.stack
* @constructor
* @param {Object} config The transports configuration.
* @cfg {String} remote The remote document to communicate with.
*/
easyXDM.stack.FrameElementTransport = function(config){
// #ifdef debug
var trace = debug.getTracer("easyXDM.stack.FrameElementTransport");
trace("constructor");
// #endif
var pub, frame, send, targetOrigin;
return (pub = {
outgoing: function(message, domain, fn){
send.call(this, message);
if (fn) {
fn();
}
},
destroy: function(){
// #ifdef debug
trace("destroy");
// #endif
if (frame) {
frame.parentNode.removeChild(frame);
frame = null;
}
},
onDOMReady: function(){
// #ifdef debug
trace("init");
// #endif
targetOrigin = getLocation(config.remote);
if (config.isHost) {
// set up the iframe
apply(config.props, {
src: appendQueryParameters(config.remote, {
xdm_e: location.protocol + "//" + location.host + location.pathname + location.search,
xdm_c: config.channel,
xdm_p: 5 // 5 = FrameElementTransport
}),
name: IFRAME_PREFIX + config.channel + "_provider"
});
frame = createFrame(config);
frame.fn = function(sendFn){
delete frame.fn;
send = sendFn;
setTimeout(function(){
pub.up.callback(true);
}, 0);
// remove the function so that it cannot be used to overwrite the send function later on
return function(msg){
pub.up.incoming(msg, targetOrigin);
};
};
}
else {
// This is to mitigate origin-spoofing
window.parent.location = query.xdm_e + "#";
send = window.frameElement.fn(function(msg){
pub.up.incoming(msg, targetOrigin);
});
pub.up.callback(true);
}
},
init: function(){
whenReady(pub.onDOMReady, pub);
}
});
};