File: jQuery.AJAX/js/jQuery.AJAX.js

/**
 * jQuery.AJAX
 *
 * A plug-in to handle AJAX form requests
 *
 * Features:
 *  - caching
 *  - context of request
 *  - type (json, jsonp, xml and script supported)
 *  - success callback
 *  - error callback
 *  - before submit callback
 *  - X-Alt-Referer headers
 *  - Content-MD5 headers
 *
 * Fork me @ https://www.github.com/jas-/jQuery.AJAX
 *
 * Author: Jason Gerfen <jason.gerfen@gmail.com>
 * License: GPL (see LICENSE)
 *
 */


(function($){
 /**
   * @function jQuery.AJAX
   * @abstract Handle AJAX form requests
   * @param options object options object for specific operations
   *                       cache, debug, callback, context, preCallback
   */
 $.fn.AJAX = function(method) {

  /**
   * @object defaults
   * @abstract Default set of options for plug-in
   */
  var defaults = {
   formID:       $(this),
   appID:        'jQuery.AJAX',
   cache:        true,
   context:      $(this),
   type:         'json',
   clickjack:    'deny',
   xss:          true,
   proxy:        'http',
   strict:       true,
   callback:     function(){},
   preCallback:  function(){},
   errCallback:  function(){}
  };

  /**
   * @object methods
   * @abstract Plug-in methods
   */
  var methods = {

   /**
    * @function init
    * @abstract Performs XMLHttpRequest by first setting
    *           configurable parameters, setting custom X-Alt-Referer
    *           header and CRC header via Content-MD5 of serialized form
    *           data and optionally performs pre-, post and error callbacks
    */
   init: function(o){
    var opts = $.extend({}, defaults, o);
    $('#'+opts.formID.attr('id')).on('submit', function(e){
     e.preventDefault();
     var _data = _serialize(_gE(opts));
     $.ajax({
      form: opts.formID.attr('id'),
      url: opts.formID.attr('action'),
      type: opts.formID.attr('method'),
      data: _data,
      context: opts.context,
      cache: opts.cache,
      crossDomain: (opts.type==='jsonp') ? true : false,
      dataType: opts.type,
      beforeSend: function(xhr){
       xhr.setRequestHeader('X-Alt-Referer', opts.appID);
       xhr.setRequestHeader('X-Forwarded-Proto', opts.proxy);
       xhr.setRequestHeader('X-Frame-Options', opts.clickjack);
       if (opts.xss){
        xhr.setRequestHeader('X-XSS-Protection', '1;mode=block');
       }
       if (opts.formID.serialize()){
        xhr.setRequestHeader('Content-MD5', base64.encode(md5(_data)));
       } else {
        xhr.setRequestHeader('Content-MD5', base64.encode(md5(o.appID)));
       }
       ((opts.preCallback)&&($.isFunction(opts.preCallback))) ?
         opts.preCallback(xhr) : false;
      },
      success: function(x, status, xhr){
       ((opts.strict)&&(opts.strict==true)&&(_vE(xhr, opts)==true)&&
        (opts.callback)&&($.isFunction(opts.callback))) ?
         opts.callback.call(x) :
          ((opts.strict)&&(opts.strict==true)&&(_vE(xhr, opts)==false)&&
           (opts.errCallback)&&($.isFunction(opts.errCallback))) ?
            opts.errCallback.call(x) : console.log(x);
      },
      error: function(xhr, status, error){
       ((opts.errCallback)&&($.isFunction(opts.errCallback))) ?
         opts.errCallback.call(xhr, status, error) : false;
      }
     });
     return true;
    });
   }
  };

  /**
   * @function _vE
   * @abstract Performs header validation if transaction type is set
   *           to strict (empty = false)
   */
  var _vE = function(xhr, o){
   return ((vStr(xhr.getResponseHeader('X-Alt-Referer')))&&
           (vStr(xhr.getResponseHeader('X-Forwarded-Proto')))&&
           (vStr(xhr.getResponseHeader('X-Frame-Options')))&&
           (vStr(xhr.getResponseHeader('X-XSS-Protection')))) ? _vM(xhr, o) : false;
  }

  /**
   * @function _vM
   * @abstract Performs header validation if transaction type is set
   *           to strict (opts != headers = false)
   */
  var _vM = function(xhr, o){
   var xss = (o.xss) ? '1;mode=block' : '0';
   return ((xhr.getResponseHeader('X-Alt-Referer')==o.appID)&&
           (xhr.getResponseHeader('X-Forwarded-Proto')==o.proxy)&&
           (xhr.getResponseHeader('X-Frame-Options')==o.clickjack)&&
           (xhr.getResponseHeader('X-XSS-Protection')==xss)) ? true : false;
  }

  /**
   * @function md5
   * @abstract Performs MD5 hash of serialized form data. The data is then
   *           to be used on the server as a checksum
   * @author   http://www.webtoolkit.info/javascript-md5.html
   */
  var md5 = function(v){
   function RotateLeft(lValue, iShiftBits){
    return (lValue<<iShiftBits)|(lValue>>>(32-iShiftBits));
   }
   function AddUnsigned(lX,lY){
    var lX4,lY4,lX8,lY8,lResult;
    lX8=(lX&0x80000000);
    lY8=(lY&0x80000000);
    lX4=(lX&0x40000000);
    lY4=(lY&0x40000000);
    lResult=(lX&0x3FFFFFFF)+(lY&0x3FFFFFFF);
    if (lX4&lY4){
     return (lResult^0x80000000^lX8^lY8);
    }
    if (lX4|lY4){
     if (lResult&0x40000000){
      return (lResult^0xC0000000^lX8^lY8);
     }else{
      return (lResult^0x40000000^lX8^lY8);
     }
    }else{
     return (lResult^lX8^lY8);
    }
   }
   function F(x,y,z){return (x&y)|((~x)&z);}
   function G(x,y,z){return (x&z)|(y&(~z));}
   function H(x,y,z){return (x^y^z);}
   function I(x,y,z){return (y^(x|(~z)));}
   function FF(a,b,c,d,x,s,ac) {
    a=AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
   }
   function GG(a,b,c,d,x,s,ac) {
    a=AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
   }
   function HH(a,b,c,d,x,s,ac) {
    a=AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
   }
   function II(a,b,c,d,x,s,ac) {
    a=AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
   }
   function ConvertToWordArray(string) {
    var lWordCount;
    var lMessageLength = string.length;
    var lNumberOfWords_temp1=lMessageLength + 8;
    var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
    var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
    var lWordArray=Array(lNumberOfWords-1);
    var lBytePosition = 0;
    var lByteCount = 0;
    while ( lByteCount < lMessageLength ) {
     lWordCount = (lByteCount-(lByteCount % 4))/4;
     lBytePosition = (lByteCount % 4)*8;
     lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition));
     lByteCount++;
    }
    lWordCount = (lByteCount-(lByteCount % 4))/4;
    lBytePosition = (lByteCount % 4)*8;
    lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
    lWordArray[lNumberOfWords-2] = lMessageLength<<3;
    lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
    return lWordArray;
   }
   function WordToHex(lValue) {
    var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
    for (lCount = 0;lCount<=3;lCount++) {
     lByte = (lValue>>>(lCount*8)) & 255;
     WordToHexValue_temp = "0" + lByte.toString(16);
     WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
    }
    return WordToHexValue;
   }
   function Utf8Encode(string){
    return utf8.encode(string);
   }
   var x=Array();
   var k,AA,BB,CC,DD,a,b,c,d;
   var S11=7, S12=12, S13=17, S14=22;
   var S21=5, S22=9 , S23=14, S24=20;
   var S31=4, S32=11, S33=16, S34=23;
   var S41=6, S42=10, S43=15, S44=21;
   string = Utf8Encode(v);
   x = ConvertToWordArray(string);
   a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
   for (k=0;k<x.length;k+=16){
    AA=a; BB=b; CC=c; DD=d;
    a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
    d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
    c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
    b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
    a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
    d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
    c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
    b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
    a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
    d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
    c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
    b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
    a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
    d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
    c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
    b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
    a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
    d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
    c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
    b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
    a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
    d=GG(d,a,b,c,x[k+10],S22,0x2441453);
    c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
    b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
    a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
    d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
    c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
    b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
    a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
    d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
    c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
    b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
    a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
    d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
    c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
    b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
    a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
    d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
    c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
    b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
    a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
    d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
    c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
    b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
    a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
    d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
    c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
    b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
    a=II(a,b,c,d,x[k+0], S41,0xF4292244);
    d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
    c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
    b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
    a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
    d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
    c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
    b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
    a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
    d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
    c=II(c,d,a,b,x[k+6], S43,0xA3014314);
    b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
    a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
    d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
    c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
    b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
    a=AddUnsigned(a,AA);
    b=AddUnsigned(b,BB);
    c=AddUnsigned(c,CC);
    d=AddUnsigned(d,DD);
   }
   var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
   return temp.toLowerCase();
  }

  /**
   * @function base64
   * @abstract Performs base64 encoding of argument by first encoding in
   *           a strict UTF8 format
   * @author   http://www.webtoolkit.info/javascript-base64.html
   */
  var base64 = {
   key: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
   encode: function(v){
    var c1, c2, c3, e1, e2, e3, e4;
    var i=0; var r='';
    v=utf8.encode(v);
    while (i<v.length){
     c1=v.charCodeAt(i++);
     c2=v.charCodeAt(i++);
     c3=v.charCodeAt(i++);
     e1=c1>>2;
     e2=((c1&3)<<4)|(c2>>4);
     e3=((c2&15)<<2)|(c3>>6);
     e4=c3&63;
     if (isNaN(c2)){
      e3=e4=64;
     }else if (isNaN(c3)){
      e4=64;
     }
     r=r+this.key.charAt(e1)+this.key.charAt(e2)+this.key.charAt(e3)+this.key.charAt(e4);
    }
    return r;
   }
  }

  /**
   * @function utf8
   * @abstract Helps perform encoding of specified data
   * @author   http://www.webtoolkit.info/javascript-base64.html
   */
  var utf8 = {
   encode: function(v){
    v=v.replace(/\r\n/g,"\n");
    var r='';
    for (var n=0; n<v.length; n++){
     var c=v.charCodeAt(n);
     if (c<128){
      r += String.fromCharCode(c);
     }else if((c>127)&&(c<2048)){
      r += String.fromCharCode((c>>6)|192);
      r += String.fromCharCode((c&63)|128);
     }else {
      r += String.fromCharCode((c>>12)|224);
      r += String.fromCharCode(((c>>6)&63)|128);
      r += String.fromCharCode((c&63)|128);
     }
    }
    return r;
   }
  }

  /**
   * @function _gE
   * @abstract Generates object of specified DOM form element that are non-null
   */
  var _gE = function(opts){
   var obj={};
   $.each($(':input, input:radio:selected, input:checkbox:checked, textarea'), function(k,v){
    if ((vStr(v.value))&&(vStr(v.name))){
     obj[v.name] = v.value;
    }
   });
   return obj;
  }

  /**
   * @function _serialize
   * @abstract Create serialized string of object
   */
  var _serialize = function(obj){
   if (szCk(obj)>0){
    var x='';
    $.each(obj, function(a, b){
     if (typeof b==='object'){
      _serialize(b);
     } else {
      x+=a+'='+b+'&';
     }
    });
    x = x.substring(0, x.length-1);
   } else {
    x = false;
   }
   return x;
  }

  /**
   * @function szCk
   * @abstract Performs a check on object sizes
   */
  var szCk = function(obj){
   var n = 0;
   $.each(obj, function(k, v){
    if (obj.hasOwnProperty(k)) n++;
   });
   return n;
  }

  /**
   * @function vStr
   * @abstract Function used combine string checking functions
   */
  var vStr = function(x){
   return ((x===false)||(x.length===0)||(!x)||(x===null)||
           (x==='')||(typeof x==='undefined')) ? false : true;
  }

  /* robot, do something */
  if (methods[method]){
   return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
  } else if ((typeof method==='object')||(!method)){
   return methods.init.apply(this, arguments);
  } else {
   console.log('Method '+method+' does not exist');
  }
 };
})(jQuery);