// jQuery.XDomainRequest.js
// Author: Jason Moon - @JSONMOON
// IE8+
/* This file is MIT licensed, license below:
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.
 */

if (!jQuery.support.cors && jQuery.ajaxTransport && window.XDomainRequest) {
  var httpRegEx = /^https?:\/\//i;
  var getOrPostRegEx = /^get|post$/i;
  var sameSchemeRegEx = new RegExp('^'+location.protocol, 'i');
  var htmlRegEx = /text\/html/i;
  var jsonRegEx = /\/json/i;
  var xmlRegEx = /\/xml/i;
  
  // ajaxTransport exists in jQuery 1.5+
  jQuery.ajaxTransport('text html xml json', function(options, userOptions, jqXHR){
    // XDomainRequests must be: asynchronous, GET or POST methods, HTTP or HTTPS protocol, and same scheme as calling page
    if (options.crossDomain && options.async && getOrPostRegEx.test(options.type) && httpRegEx.test(options.url) && sameSchemeRegEx.test(options.url)) {
      var xdr = null;
      var userType = (userOptions.dataType||'').toLowerCase();
      return {
        send: function(headers, complete){
          xdr = new XDomainRequest();
          if (/^\d+$/.test(userOptions.timeout)) {
            xdr.timeout = userOptions.timeout;
          }
          xdr.ontimeout = function(){
            complete(500, 'timeout');
          };
          xdr.onload = function(){
            var allResponseHeaders = 'Content-Length: ' + xdr.responseText.length + '\r\nContent-Type: ' + xdr.contentType;
            var status = {
              code: 200,
              message: 'success'
            };
            var responses = {
              text: xdr.responseText
            };
            try {
              if (userType === 'html' || htmlRegEx.test(xdr.contentType)) {
                responses.html = xdr.responseText;
              } else if (userType === 'json' || (userType !== 'text' && jsonRegEx.test(xdr.contentType))) {
                try {
                  responses.json = jQuery.parseJSON(xdr.responseText);
                } catch(e) {
                  status.code = 500;
                  status.message = 'parseerror';
                  //throw 'Invalid JSON: ' + xdr.responseText;
                }
              } else if (userType === 'xml' || (userType !== 'text' && xmlRegEx.test(xdr.contentType))) {
                var doc = new ActiveXObject('Microsoft.XMLDOM');
                doc.async = false;
                try {
                  doc.loadXML(xdr.responseText);
                } catch(e) {
                  doc = undefined;
                }
                if (!doc || !doc.documentElement || doc.getElementsByTagName('parsererror').length) {
                  status.code = 500;
                  status.message = 'parseerror';
                  throw 'Invalid XML: ' + xdr.responseText;
                }
                responses.xml = doc;
              }
            } catch(parseMessage) {
              throw parseMessage;
            } finally {
              complete(status.code, status.message, responses, allResponseHeaders);
            }
          };
          // set an empty handler for 'onprogress' so requests don't get aborted
          xdr.onprogress = function(){};
          xdr.onerror = function(){
            complete(500, 'error', {
              text: xdr.responseText
            });
          };
          var postData = '';
          if (userOptions.data) {
            postData = (jQuery.type(userOptions.data) === 'string') ? userOptions.data : jQuery.param(userOptions.data);
          }
          xdr.open(options.type, options.url);
          xdr.send(postData);
        },
        abort: function(){
          if (xdr) {
            xdr.abort();
          }
        }
      };
    }
  });
}
