huiliao-app/rn-wechat/app/Sdk/dist/strophe-1.2.8.js

/** File: strophe.js
 *  A JavaScript library for XMPP BOSH/XMPP over Websocket.
 *
 *  This is the JavaScript version of the Strophe library.  Since JavaScript
 *  had no facilities for persistent TCP connections, this library uses
 *  Bidirectional-streams Over Synchronous HTTP (BOSH) to emulate
 *  a persistent, stateful, two-way connection to an XMPP server.  More
 *  information on BOSH can be found in XEP 124.
 *
 *  This version of Strophe also works with WebSockets.
 *  For more information on XMPP-over WebSocket see this RFC:
 *  http://tools.ietf.org/html/rfc7395
 */

/* All of the Strophe globals are defined in this special function below so
 * that references to the globals become closures.  This will ensure that
 * on page reload, these references will still be available to callbacks
 * that are still executing.
 */

/* jshint ignore:start */
(function (callback) {
    /* jshint ignore:end */

// This code was written by Tyler Akins and has been placed in the
// public domain.  It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-base64', function () {
        return factory()
      })
    } else {
            // Browser globals
      root.Base64 = factory()
    }
  }(this, function () {
    var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='

    var obj = {
            /**
             * Encodes a string in base64
             * @param {String} input The string to encode in base64.
             */
      encode: function (input) {
        var output = ''
        var chr1, chr2, chr3
        var enc1, enc2, enc3, enc4
        var i = 0

        do {
          chr1 = input.charCodeAt(i++)
          chr2 = input.charCodeAt(i++)
          chr3 = input.charCodeAt(i++)

          enc1 = chr1 >> 2
          enc2 = ((chr1 & 3) << 4) | (chr2 >> 4)
          enc3 = ((chr2 & 15) << 2) | (chr3 >> 6)
          enc4 = chr3 & 63

          if (isNaN(chr2)) {
            enc2 = ((chr1 & 3) << 4)
            enc3 = enc4 = 64
          } else if (isNaN(chr3)) {
            enc4 = 64
          }

          output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) +
                        keyStr.charAt(enc3) + keyStr.charAt(enc4)
        } while (i < input.length)

        return output
      },

            /**
             * Decodes a base64 string.
             * @param {String} input The string to decode.
             */
      decode: function (input) {
        var output = ''
        var chr1, chr2, chr3
        var enc1, enc2, enc3, enc4
        var i = 0

                // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '')

        do {
          enc1 = keyStr.indexOf(input.charAt(i++))
          enc2 = keyStr.indexOf(input.charAt(i++))
          enc3 = keyStr.indexOf(input.charAt(i++))
          enc4 = keyStr.indexOf(input.charAt(i++))

          chr1 = (enc1 << 2) | (enc2 >> 4)
          chr2 = ((enc2 & 15) << 4) | (enc3 >> 2)
          chr3 = ((enc3 & 3) << 6) | enc4

          output = output + String.fromCharCode(chr1)

          if (enc3 != 64) {
            output = output + String.fromCharCode(chr2)
          }
          if (enc4 != 64) {
            output = output + String.fromCharCode(chr3)
          }
        } while (i < input.length)

        return output
      }
    }
    return obj
  }));

    /*
     * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
     * in FIPS PUB 180-1
     * Version 2.1a Copyright Paul Johnston 2000 - 2002.
     * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
     * Distributed under the BSD License
     * See http://pajhome.org.uk/crypt/md5 for details.
     */

    /* jshint undef: true, unused: true:, noarg: true, latedef: true */
    /* global define */

    /* Some functions and variables have been stripped for use with Strophe */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-sha1', function () {
        return factory()
      })
    } else {
            // Browser globals
      root.SHA1 = factory()
    }
  }(this, function () {
        /*
         * Calculate the SHA-1 of an array of big-endian words, and a bit length
         */
    function core_sha1 (x, len) {
            /* append padding */
      x[len >> 5] |= 0x80 << (24 - len % 32)
      x[((len + 64 >> 9) << 4) + 15] = len

      var w = new Array(80)
      var a = 1732584193
      var b = -271733879
      var c = -1732584194
      var d = 271733878
      var e = -1009589776

      var i, j, t, olda, oldb, oldc, oldd, olde
      for (i = 0; i < x.length; i += 16) {
        olda = a
        oldb = b
        oldc = c
        oldd = d
        olde = e

        for (j = 0; j < 80; j++) {
          if (j < 16) {
            w[j] = x[i + j]
          }
          else {
            w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1)
          }
          t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
                        safe_add(safe_add(e, w[j]), sha1_kt(j)))
          e = d
          d = c
          c = rol(b, 30)
          b = a
          a = t
        }

        a = safe_add(a, olda)
        b = safe_add(b, oldb)
        c = safe_add(c, oldc)
        d = safe_add(d, oldd)
        e = safe_add(e, olde)
      }
      return [a, b, c, d, e]
    }

        /*
         * Perform the appropriate triplet combination function for the current
         * iteration
         */
    function sha1_ft (t, b, c, d) {
      if (t < 20) {
        return (b & c) | ((~b) & d)
      }
      if (t < 40) {
        return b ^ c ^ d
      }
      if (t < 60) {
        return (b & c) | (b & d) | (c & d)
      }
      return b ^ c ^ d
    }

        /*
         * Determine the appropriate additive constant for the current iteration
         */
    function sha1_kt (t) {
      return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
                (t < 60) ? -1894007588 : -899497514
    }

        /*
         * Calculate the HMAC-SHA1 of a key and some data
         */
    function core_hmac_sha1 (key, data) {
      var bkey = str2binb(key)
      if (bkey.length > 16) {
        bkey = core_sha1(bkey, key.length * 8)
      }

      var ipad = new Array(16), opad = new Array(16)
      for (var i = 0; i < 16; i++) {
        ipad[i] = bkey[i] ^ 0x36363636
        opad[i] = bkey[i] ^ 0x5C5C5C5C
      }

      var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * 8)
      return core_sha1(opad.concat(hash), 512 + 160)
    }

        /*
         * Add integers, wrapping at 2^32. This uses 16-bit operations internally
         * to work around bugs in some JS interpreters.
         */
    function safe_add (x, y) {
      var lsw = (x & 0xFFFF) + (y & 0xFFFF)
      var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
      return (msw << 16) | (lsw & 0xFFFF)
    }

        /*
         * Bitwise rotate a 32-bit number to the left.
         */
    function rol (num, cnt) {
      return (num << cnt) | (num >>> (32 - cnt))
    }

        /*
         * Convert an 8-bit or 16-bit string to an array of big-endian words
         * In 8-bit function, characters >255 have their hi-byte silently ignored.
         */
    function str2binb (str) {
      var bin = []
      var mask = 255
      for (var i = 0; i < str.length * 8; i += 8) {
        bin[i >> 5] |= (str.charCodeAt(i / 8) & mask) << (24 - i % 32)
      }
      return bin
    }

        /*
         * Convert an array of big-endian words to a string
         */
    function binb2str (bin) {
      var str = ''
      var mask = 255
      for (var i = 0; i < bin.length * 32; i += 8) {
        str += String.fromCharCode((bin[i >> 5] >>> (24 - i % 32)) & mask)
      }
      return str
    }

        /*
         * Convert an array of big-endian words to a base-64 string
         */
    function binb2b64 (binarray) {
      var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
      var str = ''
      var triplet, j
      for (var i = 0; i < binarray.length * 4; i += 3) {
        triplet = (((binarray[i >> 2] >> 8 * (3 - i % 4)) & 0xFF) << 16) |
                    (((binarray[i + 1 >> 2] >> 8 * (3 - (i + 1) % 4)) & 0xFF) << 8) |
                    ((binarray[i + 2 >> 2] >> 8 * (3 - (i + 2) % 4)) & 0xFF)
        for (j = 0; j < 4; j++) {
          if (i * 8 + j * 6 > binarray.length * 32) {
            str += '='
          }
          else {
            str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F)
          }
        }
      }
      return str
    }

        /*
         * These are the functions you'll usually want to call
         * They take string arguments and return either hex or base-64 encoded strings
         */
    return {
      b64_hmac_sha1: function (key, data) {
        return binb2b64(core_hmac_sha1(key, data))
      },
      b64_sha1: function (s) {
        return binb2b64(core_sha1(str2binb(s), s.length * 8))
      },
      binb2str: binb2str,
      core_hmac_sha1: core_hmac_sha1,
      str_hmac_sha1: function (key, data) {
        return binb2str(core_hmac_sha1(key, data))
      },
      str_sha1: function (s) {
        return binb2str(core_sha1(str2binb(s), s.length * 8))
      }
    }
  }));

    /*
     * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
     * Digest Algorithm, as defined in RFC 1321.
     * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
     * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
     * Distributed under the BSD License
     * See http://pajhome.org.uk/crypt/md5 for more info.
     */

    /*
     * Everything that isn't used by Strophe has been stripped here!
     */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-md5', function () {
        return factory()
      })
    } else {
            // Browser globals
      root.MD5 = factory()
    }
  }(this, function (b) {
        /*
         * Add integers, wrapping at 2^32. This uses 16-bit operations internally
         * to work around bugs in some JS interpreters.
         */
    var safe_add = function (x, y) {
      var lsw = (x & 0xFFFF) + (y & 0xFFFF)
      var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
      return (msw << 16) | (lsw & 0xFFFF)
    }

        /*
         * Bitwise rotate a 32-bit number to the left.
         */
    var bit_rol = function (num, cnt) {
      return (num << cnt) | (num >>> (32 - cnt))
    }

        /*
         * Convert a string to an array of little-endian words
         */
    var str2binl = function (str) {
      var bin = []
      for (var i = 0; i < str.length * 8; i += 8) {
        bin[i >> 5] |= (str.charCodeAt(i / 8) & 255) << (i % 32)
      }
      return bin
    }

        /*
         * Convert an array of little-endian words to a string
         */
    var binl2str = function (bin) {
      var str = ''
      for (var i = 0; i < bin.length * 32; i += 8) {
        str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & 255)
      }
      return str
    }

        /*
         * Convert an array of little-endian words to a hex string.
         */
    var binl2hex = function (binarray) {
      var hex_tab = '0123456789abcdef'
      var str = ''
      for (var i = 0; i < binarray.length * 4; i++) {
        str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
                    hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
      }
      return str
    }

        /*
         * These functions implement the four basic operations the algorithm uses.
         */
    var md5_cmn = function (q, a, b, x, s, t) {
      return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
    }

    var md5_ff = function (a, b, c, d, x, s, t) {
      return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
    }

    var md5_gg = function (a, b, c, d, x, s, t) {
      return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
    }

    var md5_hh = function (a, b, c, d, x, s, t) {
      return md5_cmn(b ^ c ^ d, a, b, x, s, t)
    }

    var md5_ii = function (a, b, c, d, x, s, t) {
      return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
    }

        /*
         * Calculate the MD5 of an array of little-endian words, and a bit length
         */
    var core_md5 = function (x, len) {
            /* append padding */
      x[len >> 5] |= 0x80 << ((len) % 32)
      x[(((len + 64) >>> 9) << 4) + 14] = len

      var a = 1732584193
      var b = -271733879
      var c = -1732584194
      var d = 271733878

      var olda, oldb, oldc, oldd
      for (var i = 0; i < x.length; i += 16) {
        olda = a
        oldb = b
        oldc = c
        oldd = d

        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)

        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)

        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)

        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

        a = safe_add(a, olda)
        b = safe_add(b, oldb)
        c = safe_add(c, oldc)
        d = safe_add(d, oldd)
      }
      return [a, b, c, d]
    }

    var obj = {
            /*
             * These are the functions you'll usually want to call.
             * They take string arguments and return either hex or base-64 encoded
             * strings.
             */
      hexdigest: function (s) {
        return binl2hex(core_md5(str2binl(s), s.length * 8))
      },

      hash: function (s) {
        return binl2str(core_md5(str2binl(s), s.length * 8))
      }
    }
    return obj
  }));

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-utils', function () {
        return factory()
      })
    } else {
            // Browser globals
      root.stropheUtils = factory()
    }
  }(this, function () {
    var utils = {

      utf16to8: function (str) {
        var i, c
        var out = ''
        var len = str.length
        for (i = 0; i < len; i++) {
          c = str.charCodeAt(i)
          if ((c >= 0x0000) && (c <= 0x007F)) {
            out += str.charAt(i)
          } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F))
            out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F))
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F))
          } else {
            out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F))
            out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F))
          }
        }
        return out
      },

      addCookies: function (cookies) {
                /* Parameters:
                 *  (Object) cookies - either a map of cookie names
                 *    to string values or to maps of cookie values.
                 *
                 * For example:
                 * { "myCookie": "1234" }
                 *
                 * or:
                 * { "myCookie": {
                 *      "value": "1234",
                 *      "domain": ".example.org",
                 *      "path": "/",
                 *      "expires": expirationDate
                 *      }
                 *  }
                 *
                 *  These values get passed to Strophe.Connection via
                 *   options.cookies
                 */
        var cookieName, cookieObj, isObj, cookieValue, expires, domain, path
        for (cookieName in (cookies || {})) {
          expires = ''
          domain = ''
          path = ''
          cookieObj = cookies[cookieName]
          isObj = typeof cookieObj == 'object'
          cookieValue = escape(unescape(isObj ? cookieObj.value : cookieObj))
          if (isObj) {
            expires = cookieObj.expires ? ';expires=' + cookieObj.expires : ''
            domain = cookieObj.domain ? ';domain=' + cookieObj.domain : ''
            path = cookieObj.path ? ';path=' + cookieObj.path : ''
          }
          document.cookie =
                        cookieName + '=' + cookieValue + expires + domain + path
        }
      }
    }
    return utils
  }));

    /*
     This program is distributed under the terms of the MIT license.
     Please see the LICENSE file for details.

     Copyright 2006-2008, OGG, LLC
     */

    /* jshint undef: true, unused: true:, noarg: true, latedef: true */
    /* global define */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-polyfill', [], function () {
        return factory()
      })
    } else {
            // Browser globals
      return factory()
    }
  }(this, function () {
        /** PrivateFunction: Function.prototype.bind
         *  Bind a function to an instance.
         *
         *  This Function object extension method creates a bound method similar
         *  to those in Python.  This means that the 'this' object will point
         *  to the instance you want.  See
         *  <a href='https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind'>MDC's bind() documentation</a> and
         *  <a href='http://benjamin.smedbergs.us/blog/2007-01-03/bound-functions-and-function-imports-in-javascript/'>Bound Functions and Function Imports in JavaScript</a>
         *  for a complete explanation.
         *
         *  This extension already exists in some browsers (namely, Firefox 3), but
         *  we provide it to support those that don't.
         *
         *  Parameters:
         *    (Object) obj - The object that will become 'this' in the bound function.
         *    (Object) argN - An option argument that will be prepended to the
         *      arguments given for the function call
         *
         *  Returns:
         *    The bound function.
         */
    if (!Function.prototype.bind) {
      Function.prototype.bind = function (obj /*, arg1, arg2, ... */) {
        var func = this
        var _slice = Array.prototype.slice
        var _concat = Array.prototype.concat
        var _args = _slice.call(arguments, 1)

        return function () {
          return func.apply(obj ? obj : this,
                        _concat.call(_args,
                            _slice.call(arguments, 0)))
        }
      }
    }

        /** PrivateFunction: Array.isArray
         *  This is a polyfill for the ES5 Array.isArray method.
         */
    if (!Array.isArray) {
      Array.isArray = function (arg) {
        return Object.prototype.toString.call(arg) === '[object Array]'
      }
    }

        /** PrivateFunction: Array.prototype.indexOf
         *  Return the index of an object in an array.
         *
         *  This function is not supplied by some JavaScript implementations, so
         *  we provide it if it is missing.  This code is from:
         *  http://developer.mozilla.org/En/Core_JavaScript_1.5_Reference:Objects:Array:indexOf
         *
         *  Parameters:
         *    (Object) elt - The object to look for.
         *    (Integer) from - The index from which to start looking. (optional).
         *
         *  Returns:
         *    The index of elt in the array or -1 if not found.
         */
    if (!Array.prototype.indexOf) {
      Array.prototype.indexOf = function (elt /*, from */) {
        var len = this.length

        var from = Number(arguments[1]) || 0
        from = (from < 0) ? Math.ceil(from) : Math.floor(from)
        if (from < 0) {
          from += len
        }

        for (; from < len; from++) {
          if (from in this && this[from] === elt) {
            return from
          }
        }

        return -1
      }
    }
  }));

    /*
     This program is distributed under the terms of the MIT license.
     Please see the LICENSE file for details.

     Copyright 2006-2008, OGG, LLC
     */

    /* jshint undef: true, unused: true:, noarg: true, latedef: true */
    /* global define, document, window, setTimeout, clearTimeout, console, ActiveXObject, DOMParser */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-core', [
        'strophe-sha1',
        'strophe-base64',
        'strophe-md5',
        'strophe-utils',
        'strophe-polyfill'
      ], function () {
        return factory.apply(this, arguments)
      })
    } else {
            // Browser globals
      var o = factory(root.SHA1, root.Base64, root.MD5, root.stropheUtils)
      window.Strophe = o.Strophe
      window.$build = o.$build
      window.$iq = o.$iq
      window.$msg = o.$msg
      window.$pres = o.$pres
      window.SHA1 = o.SHA1
      window.Base64 = o.Base64
      window.MD5 = o.MD5
      window.b64_hmac_sha1 = o.SHA1.b64_hmac_sha1
      window.b64_sha1 = o.SHA1.b64_sha1
      window.str_hmac_sha1 = o.SHA1.str_hmac_sha1
      window.str_sha1 = o.SHA1.str_sha1
    }
  }(this, function (SHA1, Base64, MD5, utils) {
    var Strophe

        /** Function: $build
         *  Create a Strophe.Builder.
         *  This is an alias for 'new Strophe.Builder(name, attrs)'.
         *
         *  Parameters:
         *    (String) name - The root element name.
         *    (Object) attrs - The attributes for the root element in object notation.
         *
         *  Returns:
         *    A new Strophe.Builder object.
         */
    function $build (name, attrs) {
      return new Strophe.Builder(name, attrs)
    }

        /** Function: $msg
         *  Create a Strophe.Builder with a <message/> element as the root.
         *
         *  Parameters:
         *    (Object) attrs - The <message/> element attributes in object notation.
         *
         *  Returns:
         *    A new Strophe.Builder object.
         */
    function $msg (attrs) {
      return new Strophe.Builder('message', attrs)
    }

        /** Function: $iq
         *  Create a Strophe.Builder with an <iq/> element as the root.
         *
         *  Parameters:
         *    (Object) attrs - The <iq/> element attributes in object notation.
         *
         *  Returns:
         *    A new Strophe.Builder object.
         */
    function $iq (attrs) {
      return new Strophe.Builder('iq', attrs)
    }

        /** Function: $pres
         *  Create a Strophe.Builder with a <presence/> element as the root.
         *
         *  Parameters:
         *    (Object) attrs - The <presence/> element attributes in object notation.
         *
         *  Returns:
         *    A new Strophe.Builder object.
         */
    function $pres (attrs) {
      return new Strophe.Builder('presence', attrs)
    }

        /** Class: Strophe
         *  An object container for all Strophe library functions.
         *
         *  This class is just a container for all the objects and constants
         *  used in the library.  It is not meant to be instantiated, but to
         *  provide a namespace for library objects, constants, and functions.
         */
    Strophe = {
            /** Constant: VERSION
             *  The version of the Strophe library. Unreleased builds will have
             *  a version of head-HASH where HASH is a partial revision.
             */
      VERSION: '1.2.8',

            /** Constants: XMPP Namespace Constants
             *  Common namespace constants from the XMPP RFCs and XEPs.
             *
             *  NS.HTTPBIND - HTTP BIND namespace from XEP 124.
             *  NS.BOSH - BOSH namespace from XEP 206.
             *  NS.CLIENT - Main XMPP client namespace.
             *  NS.AUTH - Legacy authentication namespace.
             *  NS.ROSTER - Roster operations namespace.
             *  NS.PROFILE - Profile namespace.
             *  NS.DISCO_INFO - Service discovery info namespace from XEP 30.
             *  NS.DISCO_ITEMS - Service discovery items namespace from XEP 30.
             *  NS.MUC - Multi-User Chat namespace from XEP 45.
             *  NS.SASL - XMPP SASL namespace from RFC 3920.
             *  NS.STREAM - XMPP Streams namespace from RFC 3920.
             *  NS.BIND - XMPP Binding namespace from RFC 3920.
             *  NS.SESSION - XMPP Session namespace from RFC 3920.
             *  NS.XHTML_IM - XHTML-IM namespace from XEP 71.
             *  NS.XHTML - XHTML body namespace from XEP 71.
             */
      NS: {
        HTTPBIND: 'http://jabber.org/protocol/httpbind',
        BOSH: 'urn:xmpp:xbosh',
        CLIENT: 'jabber:client',
        AUTH: 'jabber:iq:auth',
        ROSTER: 'jabber:iq:roster',
        PROFILE: 'jabber:iq:profile',
        DISCO_INFO: 'http://jabber.org/protocol/disco#info',
        DISCO_ITEMS: 'http://jabber.org/protocol/disco#items',
        MUC: 'http://jabber.org/protocol/muc',
        SASL: 'urn:ietf:params:xml:ns:xmpp-sasl',
        STREAM: 'http://etherx.jabber.org/streams',
        FRAMING: 'urn:ietf:params:xml:ns:xmpp-framing',
        BIND: 'urn:ietf:params:xml:ns:xmpp-bind',
        SESSION: 'urn:ietf:params:xml:ns:xmpp-session',
        VERSION: 'jabber:iq:version',
        STANZAS: 'urn:ietf:params:xml:ns:xmpp-stanzas',
        XHTML_IM: 'http://jabber.org/protocol/xhtml-im',
        XHTML: 'http://www.w3.org/1999/xhtml'
      },

            /** Constants: XHTML_IM Namespace
             *  contains allowed tags, tag attributes, and css properties.
             *  Used in the createHtml function to filter incoming html into the allowed XHTML-IM subset.
             *  See http://xmpp.org/extensions/xep-0071.html#profile-summary for the list of recommended
             *  allowed tags and their attributes.
             */
      XHTML: {
        tags: ['a', 'blockquote', 'br', 'cite', 'em', 'img', 'li', 'ol', 'p', 'span', 'strong', 'ul', 'body'],
        attributes: {
          'a': ['href'],
          'blockquote': ['style'],
          'br': [],
          'cite': ['style'],
          'em': [],
          'img': ['src', 'alt', 'style', 'height', 'width'],
          'li': ['style'],
          'ol': ['style'],
          'p': ['style'],
          'span': ['style'],
          'strong': [],
          'ul': ['style'],
          'body': []
        },
        css: ['background-color', 'color', 'font-family', 'font-size', 'font-style', 'font-weight', 'margin-left', 'margin-right', 'text-align', 'text-decoration'],
                /** Function: XHTML.validTag
                 *
                 * Utility method to determine whether a tag is allowed
                 * in the XHTML_IM namespace.
                 *
                 * XHTML tag names are case sensitive and must be lower case.
                 */
        validTag: function (tag) {
          for (var i = 0; i < Strophe.XHTML.tags.length; i++) {
            if (tag == Strophe.XHTML.tags[i]) {
              return true
            }
          }
          return false
        },
                /** Function: XHTML.validAttribute
                 *
                 * Utility method to determine whether an attribute is allowed
                 * as recommended per XEP-0071
                 *
                 * XHTML attribute names are case sensitive and must be lower case.
                 */
        validAttribute: function (tag, attribute) {
          if (typeof Strophe.XHTML.attributes[tag] !== 'undefined' && Strophe.XHTML.attributes[tag].length > 0) {
            for (var i = 0; i < Strophe.XHTML.attributes[tag].length; i++) {
              if (attribute == Strophe.XHTML.attributes[tag][i]) {
                return true
              }
            }
          }
          return false
        },
        validCSS: function (style) {
          for (var i = 0; i < Strophe.XHTML.css.length; i++) {
            if (style == Strophe.XHTML.css[i]) {
              return true
            }
          }
          return false
        }
      },

            /** Constants: Connection Status Constants
             *  Connection status constants for use by the connection handler
             *  callback.
             *
             *  Status.ERROR - An error has occurred
             *  Status.CONNECTING - The connection is currently being made
             *  Status.CONNFAIL - The connection attempt failed
             *  Status.AUTHENTICATING - The connection is authenticating
             *  Status.AUTHFAIL - The authentication attempt failed
             *  Status.CONNECTED - The connection has succeeded
             *  Status.DISCONNECTED - The connection has been terminated
             *  Status.DISCONNECTING - The connection is currently being terminated
             *  Status.ATTACHED - The connection has been attached
             *  Status.CONNTIMEOUT - The connection has timed out
             */
      Status: {
        ERROR: 0,
        CONNECTING: 1,
        CONNFAIL: 2,
        AUTHENTICATING: 3,
        AUTHFAIL: 4,
        CONNECTED: 5,
        DISCONNECTED: 6,
        DISCONNECTING: 7,
        ATTACHED: 8,
        REDIRECT: 9,
        CONNTIMEOUT: 10
      },

            /** Constants: Log Level Constants
             *  Logging level indicators.
             *
             *  LogLevel.DEBUG - Debug output
             *  LogLevel.INFO - Informational output
             *  LogLevel.WARN - Warnings
             *  LogLevel.ERROR - Errors
             *  LogLevel.FATAL - Fatal errors
             */
      LogLevel: {
        DEBUG: 0,
        INFO: 1,
        WARN: 2,
        ERROR: 3,
        FATAL: 4
      },

            /** PrivateConstants: DOM Element Type Constants
             *  DOM element types.
             *
             *  ElementType.NORMAL - Normal element.
             *  ElementType.TEXT - Text data element.
             *  ElementType.FRAGMENT - XHTML fragment element.
             */
      ElementType: {
        NORMAL: 1,
        TEXT: 3,
        CDATA: 4,
        FRAGMENT: 11
      },

            /** PrivateConstants: Timeout Values
             *  Timeout values for error states.  These values are in seconds.
             *  These should not be changed unless you know exactly what you are
             *  doing.
             *
             *  TIMEOUT - Timeout multiplier. A waiting request will be considered
             *      failed after Math.floor(TIMEOUT * wait) seconds have elapsed.
             *      This defaults to 1.1, and with default wait, 66 seconds.
             *  SECONDARY_TIMEOUT - Secondary timeout multiplier. In cases where
             *      Strophe can detect early failure, it will consider the request
             *      failed if it doesn't return after
             *      Math.floor(SECONDARY_TIMEOUT * wait) seconds have elapsed.
             *      This defaults to 0.1, and with default wait, 6 seconds.
             */
      TIMEOUT: 1.1,
      SECONDARY_TIMEOUT: 0.1,

            /** Function: addNamespace
             *  This function is used to extend the current namespaces in
             *  Strophe.NS.  It takes a key and a value with the key being the
             *  name of the new namespace, with its actual value.
             *  For example:
             *  Strophe.addNamespace('PUBSUB', "http://jabber.org/protocol/pubsub");
             *
             *  Parameters:
             *    (String) name - The name under which the namespace will be
             *      referenced under Strophe.NS
             *    (String) value - The actual namespace.
             */
      addNamespace: function (name, value) {
        Strophe.NS[name] = value
      },

            /** Function: forEachChild
             *  Map a function over some or all child elements of a given element.
             *
             *  This is a small convenience function for mapping a function over
             *  some or all of the children of an element.  If elemName is null, all
             *  children will be passed to the function, otherwise only children
             *  whose tag names match elemName will be passed.
             *
             *  Parameters:
             *    (XMLElement) elem - The element to operate on.
             *    (String) elemName - The child element tag name filter.
             *    (Function) func - The function to apply to each child.  This
             *      function should take a single argument, a DOM element.
             */
      forEachChild: function (elem, elemName, func) {
        var i, childNode

        for (i = 0; i < elem.childNodes.length; i++) {
          childNode = elem.childNodes[i]
          if (childNode.nodeType == Strophe.ElementType.NORMAL &&
                        (!elemName || this.isTagEqual(childNode, elemName))) {
            func(childNode)
          }
        }
      },

            /** Function: isTagEqual
             *  Compare an element's tag name with a string.
             *
             *  This function is case sensitive.
             *
             *  Parameters:
             *    (XMLElement) el - A DOM element.
             *    (String) name - The element name.
             *
             *  Returns:
             *    true if the element's tag name matches _el_, and false
             *    otherwise.
             */
      isTagEqual: function (el, name) {
        return el.tagName == name
      },

            /** PrivateVariable: _xmlGenerator
             *  _Private_ variable that caches a DOM document to
             *  generate elements.
             */
      _xmlGenerator: null,

            /** PrivateFunction: _makeGenerator
             *  _Private_ function that creates a dummy XML DOM document to serve as
             *  an element and text node generator.
             */
      _makeGenerator: function () {
        var doc

                // IE9 does implement createDocument(); however, using it will cause the browser to leak memory on page unload.
                // Here, we test for presence of createDocument() plus IE's proprietary documentMode attribute, which would be
                // less than 10 in the case of IE9 and below.
        if (document.implementation.createDocument === undefined ||
                    document.implementation.createDocument && document.documentMode && document.documentMode < 10) {
          doc = this._getIEXmlDom()
          doc.appendChild(doc.createElement('strophe'))
        } else {
          doc = document.implementation
                        .createDocument('jabber:client', 'strophe', null)
        }

        return doc
      },

            /** Function: xmlGenerator
             *  Get the DOM document to generate elements.
             *
             *  Returns:
             *    The currently used DOM document.
             */
      xmlGenerator: function () {
        if (!Strophe._xmlGenerator) {
          Strophe._xmlGenerator = Strophe._makeGenerator()
        }
        return Strophe._xmlGenerator
      },

            /** PrivateFunction: _getIEXmlDom
             *  Gets IE xml doc object
             *
             *  Returns:
             *    A Microsoft XML DOM Object
             *  See Also:
             *    http://msdn.microsoft.com/en-us/library/ms757837%28VS.85%29.aspx
             */
      _getIEXmlDom: function () {
        var doc = null
        var docStrings = [
          'Msxml2.DOMDocument.6.0',
          'Msxml2.DOMDocument.5.0',
          'Msxml2.DOMDocument.4.0',
          'MSXML2.DOMDocument.3.0',
          'MSXML2.DOMDocument',
          'MSXML.DOMDocument',
          'Microsoft.XMLDOM'
        ]

        for (var d = 0; d < docStrings.length; d++) {
          if (doc === null) {
            try {
              doc = new ActiveXObject(docStrings[d])
            } catch (e) {
              doc = null
            }
          } else {
            break
          }
        }

        return doc
      },

            /** Function: xmlElement
             *  Create an XML DOM element.
             *
             *  This function creates an XML DOM element correctly across all
             *  implementations. Note that these are not HTML DOM elements, which
             *  aren't appropriate for XMPP stanzas.
             *
             *  Parameters:
             *    (String) name - The name for the element.
             *    (Array|Object) attrs - An optional array or object containing
             *      key/value pairs to use as element attributes. The object should
             *      be in the format {'key': 'value'} or {key: 'value'}. The array
             *      should have the format [['key1', 'value1'], ['key2', 'value2']].
             *    (String) text - The text child data for the element.
             *
             *  Returns:
             *    A new XML DOM element.
             */
      xmlElement: function (name) {
        if (!name) {
          return null
        }

        var node = Strophe.xmlGenerator().createElement(name)

                // FIXME: this should throw errors if args are the wrong type or
                // there are more than two optional args
        var a, i, k
        for (a = 1; a < arguments.length; a++) {
          var arg = arguments[a]
          if (!arg) {
            continue
          }
          if (typeof (arg) == 'string' ||
                        typeof (arg) == 'number') {
            node.appendChild(Strophe.xmlTextNode(arg))
          } else if (typeof (arg) == 'object' &&
                        typeof (arg.sort) == 'function') {
            for (i = 0; i < arg.length; i++) {
              var attr = arg[i]
              if (typeof (attr) == 'object' &&
                                typeof (attr.sort) == 'function' &&
                                attr[1] !== undefined &&
                                attr[1] !== null) {
                node.setAttribute(attr[0], attr[1])
              }
            }
          } else if (typeof (arg) == 'object') {
            for (k in arg) {
              if (arg.hasOwnProperty(k)) {
                  if (arg[k] !== undefined &&
                                    arg[k] !== null) {
                    node.setAttribute(k, arg[k])
                  }
                }
            }
          }
        }

        return node
      },

            /*  Function: xmlescape
             *  Excapes invalid xml characters.
             *
             *  Parameters:
             *     (String) text - text to escape.
             *
             *  Returns:
             *      Escaped text.
             */
      xmlescape: function (text) {
        text = text.replace(/\&/g, '&amp;')
        text = text.replace(/</g, '&lt;')
        text = text.replace(/>/g, '&gt;')
        text = text.replace(/'/g, '&apos;')
        text = text.replace(/"/g, '&quot;')
        return text
      },

            /*  Function: xmlunescape
             *  Unexcapes invalid xml characters.
             *
             *  Parameters:
             *     (String) text - text to unescape.
             *
             *  Returns:
             *      Unescaped text.
             */
      xmlunescape: function (text) {
        text = text.replace(/\&amp;/g, '&')
        text = text.replace(/&lt;/g, '<')
        text = text.replace(/&gt;/g, '>')
        text = text.replace(/&apos;/g, "'")
        text = text.replace(/&quot;/g, '"')
        return text
      },

            /** Function: xmlTextNode
             *  Creates an XML DOM text node.
             *
             *  Provides a cross implementation version of document.createTextNode.
             *
             *  Parameters:
             *    (String) text - The content of the text node.
             *
             *  Returns:
             *    A new XML DOM text node.
             */
      xmlTextNode: function (text) {
        return Strophe.xmlGenerator().createTextNode(text)
      },

            /** Function: xmlHtmlNode
             *  Creates an XML DOM html node.
             *
             *  Parameters:
             *    (String) html - The content of the html node.
             *
             *  Returns:
             *    A new XML DOM text node.
             */
      xmlHtmlNode: function (html) {
        var node
                // ensure text is escaped
        if (window.DOMParser) {
          var parser = new DOMParser()
          node = parser.parseFromString(html, 'text/xml')
        } else {
          node = new ActiveXObject('Microsoft.XMLDOM')
          node.async = 'false'
          node.loadXML(html)
        }
        return node
      },

            /** Function: getText
             *  Get the concatenation of all text children of an element.
             *
             *  Parameters:
             *    (XMLElement) elem - A DOM element.
             *
             *  Returns:
             *    A String with the concatenated text of all text element children.
             */
      getText: function (elem) {
        if (!elem) {
          return null
        }

        var str = ''
        if (elem.childNodes.length === 0 && elem.nodeType ==
                    Strophe.ElementType.TEXT) {
          str += elem.nodeValue
        }

        for (var i = 0; i < elem.childNodes.length; i++) {
          if (elem.childNodes[i].nodeType == Strophe.ElementType.TEXT) {
            str += elem.childNodes[i].nodeValue
          }
        }

        return Strophe.xmlescape(str)
      },

            /** Function: copyElement
             *  Copy an XML DOM element.
             *
             *  This function copies a DOM element and all its descendants and returns
             *  the new copy.
             *
             *  Parameters:
             *    (XMLElement) elem - A DOM element.
             *
             *  Returns:
             *    A new, copied DOM element tree.
             */
      copyElement: function (elem) {
        var i, el
        if (elem.nodeType == Strophe.ElementType.NORMAL) {
          el = Strophe.xmlElement(elem.tagName)

          for (i = 0; i < elem.attributes.length; i++) {
            el.setAttribute(elem.attributes[i].nodeName,
                            elem.attributes[i].value)
          }

          for (i = 0; i < elem.childNodes.length; i++) {
            el.appendChild(Strophe.copyElement(elem.childNodes[i]))
          }
        } else if (elem.nodeType == Strophe.ElementType.TEXT) {
          el = Strophe.xmlGenerator().createTextNode(elem.nodeValue)
        }

        return el
      },

            /** Function: createHtml
             *  Copy an HTML DOM element into an XML DOM.
             *
             *  This function copies a DOM element and all its descendants and returns
             *  the new copy.
             *
             *  Parameters:
             *    (HTMLElement) elem - A DOM element.
             *
             *  Returns:
             *    A new, copied DOM element tree.
             */
      createHtml: function (elem) {
        var i, el, j, tag, attribute, value, css, cssAttrs, attr, cssName, cssValue
        if (elem.nodeType == Strophe.ElementType.NORMAL) {
          tag = elem.nodeName.toLowerCase() // XHTML tags must be lower case.
          if (Strophe.XHTML.validTag(tag)) {
            try {
              el = Strophe.xmlElement(tag)
              for (i = 0; i < Strophe.XHTML.attributes[tag].length; i++) {
                attribute = Strophe.XHTML.attributes[tag][i]
                value = elem.getAttribute(attribute)
                if (typeof value == 'undefined' || value === null || value === '' || value === false || value === 0) {
                  continue
                }
                if (attribute == 'style' && typeof value == 'object') {
                  if (typeof value.cssText != 'undefined') {
                      value = value.cssText // we're dealing with IE, need to get CSS out
                    }
                }
                                // filter out invalid css styles
                if (attribute == 'style') {
                  css = []
                  cssAttrs = value.split(';')
                  for (j = 0; j < cssAttrs.length; j++) {
                      attr = cssAttrs[j].split(':')
                      cssName = attr[0].replace(/^\s*/, '').replace(/\s*$/, '').toLowerCase()
                      if (Strophe.XHTML.validCSS(cssName)) {
                        cssValue = attr[1].replace(/^\s*/, '').replace(/\s*$/, '')
                        css.push(cssName + ': ' + cssValue)
                      }
                    }
                  if (css.length > 0) {
                      value = css.join('; ')
                      el.setAttribute(attribute, value)
                    }
                } else {
                  el.setAttribute(attribute, value)
                }
              }

              for (i = 0; i < elem.childNodes.length; i++) {
                el.appendChild(Strophe.createHtml(elem.childNodes[i]))
              }
            } catch (e) { // invalid elements
              el = Strophe.xmlTextNode('')
            }
          } else {
            el = Strophe.xmlGenerator().createDocumentFragment()
            for (i = 0; i < elem.childNodes.length; i++) {
              el.appendChild(Strophe.createHtml(elem.childNodes[i]))
            }
          }
        } else if (elem.nodeType == Strophe.ElementType.FRAGMENT) {
          el = Strophe.xmlGenerator().createDocumentFragment()
          for (i = 0; i < elem.childNodes.length; i++) {
            el.appendChild(Strophe.createHtml(elem.childNodes[i]))
          }
        } else if (elem.nodeType == Strophe.ElementType.TEXT) {
          el = Strophe.xmlTextNode(elem.nodeValue)
        }

        return el
      },

            /** Function: escapeNode
             *  Escape the node part (also called local part) of a JID.
             *
             *  Parameters:
             *    (String) node - A node (or local part).
             *
             *  Returns:
             *    An escaped node (or local part).
             */
      escapeNode: function (node) {
        if (typeof node !== 'string') {
          return node
        }
        return node.replace(/^\s+|\s+$/g, '')
                    .replace(/\\/g, '\\5c')
                    .replace(/ /g, '\\20')
                    .replace(/\"/g, '\\22')
                    .replace(/\&/g, '\\26')
                    .replace(/\'/g, '\\27')
                    .replace(/\//g, '\\2f')
                    .replace(/:/g, '\\3a')
                    .replace(/</g, '\\3c')
                    .replace(/>/g, '\\3e')
                    .replace(/@/g, '\\40')
      },

            /** Function: unescapeNode
             *  Unescape a node part (also called local part) of a JID.
             *
             *  Parameters:
             *    (String) node - A node (or local part).
             *
             *  Returns:
             *    An unescaped node (or local part).
             */
      unescapeNode: function (node) {
        if (typeof node !== 'string') {
          return node
        }
        return node.replace(/\\20/g, ' ')
                    .replace(/\\22/g, '"')
                    .replace(/\\26/g, '&')
                    .replace(/\\27/g, "'")
                    .replace(/\\2f/g, '/')
                    .replace(/\\3a/g, ':')
                    .replace(/\\3c/g, '<')
                    .replace(/\\3e/g, '>')
                    .replace(/\\40/g, '@')
                    .replace(/\\5c/g, '\\')
      },

            /** Function: getNodeFromJid
             *  Get the node portion of a JID String.
             *
             *  Parameters:
             *    (String) jid - A JID.
             *
             *  Returns:
             *    A String containing the node.
             */
      getNodeFromJid: function (jid) {
        if (jid.indexOf('@') < 0) {
          return null
        }
        return jid.split('@')[0]
      },

            /** Function: getDomainFromJid
             *  Get the domain portion of a JID String.
             *
             *  Parameters:
             *    (String) jid - A JID.
             *
             *  Returns:
             *    A String containing the domain.
             */
      getDomainFromJid: function (jid) {
        var bare = Strophe.getBareJidFromJid(jid)
        if (bare.indexOf('@') < 0) {
          return bare
        } else {
          var parts = bare.split('@')
          parts.splice(0, 1)
          return parts.join('@')
        }
      },

            /** Function: getResourceFromJid
             *  Get the resource portion of a JID String.
             *
             *  Parameters:
             *    (String) jid - A JID.
             *
             *  Returns:
             *    A String containing the resource.
             */
      getResourceFromJid: function (jid) {
        var s = jid.split('/')
        if (s.length < 2) {
          return null
        }
        s.splice(0, 1)
        return s.join('/')
      },

            /** Function: getBareJidFromJid
             *  Get the bare JID from a JID String.
             *
             *  Parameters:
             *    (String) jid - A JID.
             *
             *  Returns:
             *    A String containing the bare JID.
             */
      getBareJidFromJid: function (jid) {
        return jid ? jid.split('/')[0] : null
      },

            /** Function: log
             *  User overrideable logging function.
             *
             *  This function is called whenever the Strophe library calls any
             *  of the logging functions.  The default implementation of this
             *  function does nothing.  If client code wishes to handle the logging
             *  messages, it should override this with
             *  > Strophe.log = function (level, msg) {
     *  >   (user code here)
     *  > };
             *
             *  Please note that data sent and received over the wire is logged
             *  via Strophe.Connection.rawInput() and Strophe.Connection.rawOutput().
             *
             *  The different levels and their meanings are
             *
             *    DEBUG - Messages useful for debugging purposes.
             *    INFO - Informational messages.  This is mostly information like
             *      'disconnect was called' or 'SASL auth succeeded'.
             *    WARN - Warnings about potential problems.  This is mostly used
             *      to report transient connection errors like request timeouts.
             *    ERROR - Some error occurred.
             *    FATAL - A non-recoverable fatal error occurred.
             *
             *  Parameters:
             *    (Integer) level - The log level of the log message.  This will
             *      be one of the values in Strophe.LogLevel.
             *    (String) msg - The log message.
             */
            /* jshint ignore:start */
      log: function (level, msg) {
        return
      },
            /* jshint ignore:end */

            /** Function: debug
             *  Log a message at the Strophe.LogLevel.DEBUG level.
             *
             *  Parameters:
             *    (String) msg - The log message.
             */
      debug: function (msg) {
        this.log(this.LogLevel.DEBUG, msg)
      },

            /** Function: info
             *  Log a message at the Strophe.LogLevel.INFO level.
             *
             *  Parameters:
             *    (String) msg - The log message.
             */
      info: function (msg) {
        this.log(this.LogLevel.INFO, msg)
      },

            /** Function: warn
             *  Log a message at the Strophe.LogLevel.WARN level.
             *
             *  Parameters:
             *    (String) msg - The log message.
             */
      warn: function (msg) {
        this.log(this.LogLevel.WARN, msg)
      },

            /** Function: error
             *  Log a message at the Strophe.LogLevel.ERROR level.
             *
             *  Parameters:
             *    (String) msg - The log message.
             */
      error: function (msg) {
        this.log(this.LogLevel.ERROR, msg)
      },

            /** Function: fatal
             *  Log a message at the Strophe.LogLevel.FATAL level.
             *
             *  Parameters:
             *    (String) msg - The log message.
             */
      fatal: function (msg) {
        this.log(this.LogLevel.FATAL, msg)
      },

            /** Function: serialize
             *  Render a DOM element and all descendants to a String.
             *
             *  Parameters:
             *    (XMLElement) elem - A DOM element.
             *
             *  Returns:
             *    The serialized element tree as a String.
             */
      serialize: function (elem) {
        var result

        if (!elem) {
          return null
        }

        if (typeof (elem.tree) === 'function') {
          elem = elem.tree()
        }

        var nodeName = elem.nodeName
        var i, child

        if (elem.getAttribute('_realname')) {
          nodeName = elem.getAttribute('_realname')
        }

        result = '<' + nodeName
        for (i = 0; i < elem.attributes.length; i++) {
          if (elem.attributes[i].nodeName != '_realname') {
            result += ' ' + elem.attributes[i].nodeName +
                            "='" + Strophe.xmlescape(elem.attributes[i].value) + "'"
          }
        }

        if (elem.childNodes.length > 0) {
          result += '>'
          for (i = 0; i < elem.childNodes.length; i++) {
            child = elem.childNodes[i]
            switch (child.nodeType) {
              case Strophe.ElementType.NORMAL:
                                // normal element, so recurse
                result += Strophe.serialize(child)
                break
              case Strophe.ElementType.TEXT:
                                // text element to escape values
                result += Strophe.xmlescape(child.nodeValue)
                break
              case Strophe.ElementType.CDATA:
                                // cdata section so don't escape values
                result += '<![CDATA[' + child.nodeValue + ']]>'
            }
          }
          result += '</' + nodeName + '>'
        } else {
          result += '/>'
        }

        return result
      },

            /** PrivateVariable: _requestId
             *  _Private_ variable that keeps track of the request ids for
             *  connections.
             */
      _requestId: 0,

            /** PrivateVariable: Strophe.connectionPlugins
             *  _Private_ variable Used to store plugin names that need
             *  initialization on Strophe.Connection construction.
             */
      _connectionPlugins: {},

            /** Function: addConnectionPlugin
             *  Extends the Strophe.Connection object with the given plugin.
             *
             *  Parameters:
             *    (String) name - The name of the extension.
             *    (Object) ptype - The plugin's prototype.
             */
      addConnectionPlugin: function (name, ptype) {
        Strophe._connectionPlugins[name] = ptype
      }
    }

        /** Class: Strophe.Builder
         *  XML DOM builder.
         *
         *  This object provides an interface similar to JQuery but for building
         *  DOM elements easily and rapidly.  All the functions except for toString()
         *  and tree() return the object, so calls can be chained.  Here's an
         *  example using the $iq() builder helper.
         *  > $iq({to: 'you', from: 'me', type: 'get', id: '1'})
         *  >     .c('query', {xmlns: 'strophe:example'})
         *  >     .c('example')
         *  >     .toString()
         *  The above generates this XML fragment
         *  > <iq to='you' from='me' type='get' id='1'>
         *  >   <query xmlns='strophe:example'>
         *  >     <example/>
         *  >   </query>
         *  > </iq>
         *  The corresponding DOM manipulations to get a similar fragment would be
         *  a lot more tedious and probably involve several helper variables.
         *
         *  Since adding children makes new operations operate on the child, up()
         *  is provided to traverse up the tree.  To add two children, do
         *  > builder.c('child1', ...).up().c('child2', ...)
         *  The next operation on the Builder will be relative to the second child.
         */

        /** Constructor: Strophe.Builder
         *  Create a Strophe.Builder object.
         *
         *  The attributes should be passed in object notation.  For example
         *  > var b = new Builder('message', {to: 'you', from: 'me'});
         *  or
         *  > var b = new Builder('messsage', {'xml:lang': 'en'});
         *
         *  Parameters:
         *    (String) name - The name of the root element.
         *    (Object) attrs - The attributes for the root element in object notation.
         *
         *  Returns:
         *    A new Strophe.Builder.
         */
    Strophe.Builder = function (name, attrs) {
            // Set correct namespace for jabber:client elements
      if (name == 'presence' || name == 'message' || name == 'iq') {
        if (attrs && !attrs.xmlns) {
          attrs.xmlns = Strophe.NS.CLIENT
        } else if (!attrs) {
          attrs = {xmlns: Strophe.NS.CLIENT}
        }
      }

            // Holds the tree being built.
      this.nodeTree = Strophe.xmlElement(name, attrs)

            // Points to the current operation node.
      this.node = this.nodeTree
    }

    Strophe.Builder.prototype = {
            /** Function: tree
             *  Return the DOM tree.
             *
             *  This function returns the current DOM tree as an element object.  This
             *  is suitable for passing to functions like Strophe.Connection.send().
             *
             *  Returns:
             *    The DOM tree as a element object.
             */
      tree: function () {
        return this.nodeTree
      },

            /** Function: toString
             *  Serialize the DOM tree to a String.
             *
             *  This function returns a string serialization of the current DOM
             *  tree.  It is often used internally to pass data to a
             *  Strophe.Request object.
             *
             *  Returns:
             *    The serialized DOM tree in a String.
             */
      toString: function () {
        return Strophe.serialize(this.nodeTree)
      },

            /** Function: up
             *  Make the current parent element the new current element.
             *
             *  This function is often used after c() to traverse back up the tree.
             *  For example, to add two children to the same element
             *  > builder.c('child1', {}).up().c('child2', {});
             *
             *  Returns:
             *    The Stophe.Builder object.
             */
      up: function () {
        this.node = this.node.parentNode
        return this
      },

            /** Function: attrs
             *  Add or modify attributes of the current element.
             *
             *  The attributes should be passed in object notation.  This function
             *  does not move the current element pointer.
             *
             *  Parameters:
             *    (Object) moreattrs - The attributes to add/modify in object notation.
             *
             *  Returns:
             *    The Strophe.Builder object.
             */
      attrs: function (moreattrs) {
        for (var k in moreattrs) {
          if (moreattrs.hasOwnProperty(k)) {
            if (moreattrs[k] === undefined) {
              this.node.removeAttribute(k)
            } else {
              this.node.setAttribute(k, moreattrs[k])
            }
          }
        }
        return this
      },

            /** Function: c
             *  Add a child to the current element and make it the new current
             *  element.
             *
             *  This function moves the current element pointer to the child,
             *  unless text is provided.  If you need to add another child, it
             *  is necessary to use up() to go back to the parent in the tree.
             *
             *  Parameters:
             *    (String) name - The name of the child.
             *    (Object) attrs - The attributes of the child in object notation.
             *    (String) text - The text to add to the child.
             *
             *  Returns:
             *    The Strophe.Builder object.
             */
      c: function (name, attrs, text) {
        var child = Strophe.xmlElement(name, attrs, text)
        this.node.appendChild(child)
        if (typeof text !== 'string' && typeof text !== 'number') {
          this.node = child
        }
        return this
      },

            /** Function: cnode
             *  Add a child to the current element and make it the new current
             *  element.
             *
             *  This function is the same as c() except that instead of using a
             *  name and an attributes object to create the child it uses an
             *  existing DOM element object.
             *
             *  Parameters:
             *    (XMLElement) elem - A DOM element.
             *
             *  Returns:
             *    The Strophe.Builder object.
             */
      cnode: function (elem) {
        var impNode
        var xmlGen = Strophe.xmlGenerator()
        try {
          impNode = (xmlGen.importNode !== undefined)
        }
                catch (e) {
                  impNode = false
                }
        var newElem = impNode ?
                    xmlGen.importNode(elem, true) :
                    Strophe.copyElement(elem)
        this.node.appendChild(newElem)
        this.node = newElem
        return this
      },

            /** Function: t
             *  Add a child text element.
             *
             *  This *does not* make the child the new current element since there
             *  are no children of text elements.
             *
             *  Parameters:
             *    (String) text - The text data to append to the current element.
             *
             *  Returns:
             *    The Strophe.Builder object.
             */
      t: function (text) {
        var child = Strophe.xmlTextNode(text)
        this.node.appendChild(child)
        return this
      },

            /** Function: h
             *  Replace current element contents with the HTML passed in.
             *
             *  This *does not* make the child the new current element
             *
             *  Parameters:
             *    (String) html - The html to insert as contents of current element.
             *
             *  Returns:
             *    The Strophe.Builder object.
             */
      h: function (html) {
        var fragment = document.createElement('body')

                // force the browser to try and fix any invalid HTML tags
        fragment.innerHTML = html

                // copy cleaned html into an xml dom
        var xhtml = Strophe.createHtml(fragment)

        while (xhtml.childNodes.length > 0) {
          this.node.appendChild(xhtml.childNodes[0])
        }
        return this
      }
    }

        /** PrivateClass: Strophe.Handler
         *  _Private_ helper class for managing stanza handlers.
         *
         *  A Strophe.Handler encapsulates a user provided callback function to be
         *  executed when matching stanzas are received by the connection.
         *  Handlers can be either one-off or persistant depending on their
         *  return value. Returning true will cause a Handler to remain active, and
         *  returning false will remove the Handler.
         *
         *  Users will not use Strophe.Handler objects directly, but instead they
         *  will use Strophe.Connection.addHandler() and
         *  Strophe.Connection.deleteHandler().
         */

        /** PrivateConstructor: Strophe.Handler
         *  Create and initialize a new Strophe.Handler.
         *
         *  Parameters:
         *    (Function) handler - A function to be executed when the handler is run.
         *    (String) ns - The namespace to match.
         *    (String) name - The element name to match.
         *    (String) type - The element type to match.
         *    (String) id - The element id attribute to match.
         *    (String) from - The element from attribute to match.
         *    (Object) options - Handler options
         *
         *  Returns:
         *    A new Strophe.Handler object.
         */
    Strophe.Handler = function (handler, ns, name, type, id, from, options) {
      this.handler = handler
      this.ns = ns
      this.name = name
      this.type = type
      this.id = id
      this.options = options || {matchBare: false}

            // default matchBare to false if undefined
      if (!this.options.matchBare) {
        this.options.matchBare = false
      }

      if (this.options.matchBare) {
        this.from = from ? Strophe.getBareJidFromJid(from) : null
      } else {
        this.from = from
      }

            // whether the handler is a user handler or a system handler
      this.user = true
    }

    Strophe.Handler.prototype = {
            /** PrivateFunction: isMatch
             *  Tests if a stanza matches the Strophe.Handler.
             *
             *  Parameters:
             *    (XMLElement) elem - The XML element to test.
             *
             *  Returns:
             *    true if the stanza matches and false otherwise.
             */
      isMatch: function (elem) {
        var nsMatch
        var from = null

        if (this.options.matchBare) {
          from = Strophe.getBareJidFromJid(elem.getAttribute('from'))
        } else {
          from = elem.getAttribute('from')
        }

        nsMatch = false
        if (!this.ns) {
          nsMatch = true
        } else {
          var that = this
          Strophe.forEachChild(elem, null, function (elem) {
            if (elem.getAttribute('xmlns') == that.ns) {
              nsMatch = true
            }
          })

          nsMatch = nsMatch || elem.getAttribute('xmlns') == this.ns
        }

        var elem_type = elem.getAttribute('type')
        if (nsMatch &&
                    (!this.name || Strophe.isTagEqual(elem, this.name)) &&
                    (!this.type || (Array.isArray(this.type) ? this.type.indexOf(elem_type) != -1 : elem_type == this.type)) &&
                    (!this.id || elem.getAttribute('id') == this.id) &&
                    (!this.from || from == this.from)) {
          return true
        }

        return false
      },

            /** PrivateFunction: run
             *  Run the callback on a matching stanza.
             *
             *  Parameters:
             *    (XMLElement) elem - The DOM element that triggered the
             *      Strophe.Handler.
             *
             *  Returns:
             *    A boolean indicating if the handler should remain active.
             */
      run: function (elem) {
        var result = null
        try {
          result = this.handler(elem)
        } catch (e) {
          if (e.sourceURL) {
            Strophe.fatal('error: ' + this.handler +
                            ' ' + e.sourceURL + ':' +
                            e.line + ' - ' + e.name + ': ' + e.message)
          } else if (e.fileName) {
            if (typeof (console) != 'undefined') {
              console.trace()
              console.error(this.handler, ' - error - ', e, e.message)
            }
            Strophe.fatal('error: ' + this.handler + ' ' +
                            e.fileName + ':' + e.lineNumber + ' - ' +
                            e.name + ': ' + e.message)
          } else {
            Strophe.fatal('error: ' + e.message + '\n' + e.stack)
          }

          throw e
        }

        return result
      },

            /** PrivateFunction: toString
             *  Get a String representation of the Strophe.Handler object.
             *
             *  Returns:
             *    A String.
             */
      toString: function () {
        return '{Handler: ' + this.handler + '(' + this.name + ',' +
                    this.id + ',' + this.ns + ')}'
      }
    }

        /** PrivateClass: Strophe.TimedHandler
         *  _Private_ helper class for managing timed handlers.
         *
         *  A Strophe.TimedHandler encapsulates a user provided callback that
         *  should be called after a certain period of time or at regular
         *  intervals.  The return value of the callback determines whether the
         *  Strophe.TimedHandler will continue to fire.
         *
         *  Users will not use Strophe.TimedHandler objects directly, but instead
         *  they will use Strophe.Connection.addTimedHandler() and
         *  Strophe.Connection.deleteTimedHandler().
         */

        /** PrivateConstructor: Strophe.TimedHandler
         *  Create and initialize a new Strophe.TimedHandler object.
         *
         *  Parameters:
         *    (Integer) period - The number of milliseconds to wait before the
         *      handler is called.
         *    (Function) handler - The callback to run when the handler fires.  This
         *      function should take no arguments.
         *
         *  Returns:
         *    A new Strophe.TimedHandler object.
         */
    Strophe.TimedHandler = function (period, handler) {
      this.period = period
      this.handler = handler

      this.lastCalled = new Date().getTime()
      this.user = true
    }

    Strophe.TimedHandler.prototype = {
            /** PrivateFunction: run
             *  Run the callback for the Strophe.TimedHandler.
             *
             *  Returns:
             *    true if the Strophe.TimedHandler should be called again, and false
             *      otherwise.
             */
      run: function () {
        this.lastCalled = new Date().getTime()
        return this.handler()
      },

            /** PrivateFunction: reset
             *  Reset the last called time for the Strophe.TimedHandler.
             */
      reset: function () {
        this.lastCalled = new Date().getTime()
      },

            /** PrivateFunction: toString
             *  Get a string representation of the Strophe.TimedHandler object.
             *
             *  Returns:
             *    The string representation.
             */
      toString: function () {
        return '{TimedHandler: ' + this.handler + '(' + this.period + ')}'
      }
    }

        /** Class: Strophe.Connection
         *  XMPP Connection manager.
         *
         *  This class is the main part of Strophe.  It manages a BOSH or websocket
         *  connection to an XMPP server and dispatches events to the user callbacks
         *  as data arrives. It supports SASL PLAIN, SASL DIGEST-MD5, SASL SCRAM-SHA1
         *  and legacy authentication.
         *
         *  After creating a Strophe.Connection object, the user will typically
         *  call connect() with a user supplied callback to handle connection level
         *  events like authentication failure, disconnection, or connection
         *  complete.
         *
         *  The user will also have several event handlers defined by using
         *  addHandler() and addTimedHandler().  These will allow the user code to
         *  respond to interesting stanzas or do something periodically with the
         *  connection. These handlers will be active once authentication is
         *  finished.
         *
         *  To send data to the connection, use send().
         */

        /** Constructor: Strophe.Connection
         *  Create and initialize a Strophe.Connection object.
         *
         *  The transport-protocol for this connection will be chosen automatically
         *  based on the given service parameter. URLs starting with "ws://" or
         *  "wss://" will use WebSockets, URLs starting with "http://", "https://"
         *  or without a protocol will use BOSH.
         *
         *  To make Strophe connect to the current host you can leave out the protocol
         *  and host part and just pass the path, e.g.
         *
         *  > var conn = new Strophe.Connection("/http-bind/");
         *
         *  Options common to both Websocket and BOSH:
         *  ------------------------------------------
         *
         *  The "cookies" option allows you to pass in cookies to be added to the
         *  document. These cookies will then be included in the BOSH XMLHttpRequest
         *  or in the websocket connection.
         *
         *  The passed in value must be a map of cookie names and string values:
         *
         * { "myCookie": {
 *      "value": "1234",
 *      "domain": ".example.org",
 *      "path": "/",
 *      "expires": expirationDate
 *      }
 *  }
         *
         *  Note that cookies can't be set in this way for other domains (i.e. cross-domain).
         *  Those cookies need to be set under those domains, for example they can be
         *  set server-side by making a XHR call to that domain to ask it to set any
         *  necessary cookies.
         *
         *  WebSocket options:
         *  ------------------
         *
         *  If you want to connect to the current host with a WebSocket connection you
         *  can tell Strophe to use WebSockets through a "protocol" attribute in the
         *  optional options parameter. Valid values are "ws" for WebSocket and "wss"
         *  for Secure WebSocket.
         *  So to connect to "wss://CURRENT_HOSTNAME/xmpp-websocket" you would call
         *
         *  > var conn = new Strophe.Connection("/xmpp-websocket/", {protocol: "wss"});
         *
         *  Note that relative URLs _NOT_ starting with a "/" will also include the path
         *  of the current site.
         *
         *  Also because downgrading security is not permitted by browsers, when using
         *  relative URLs both BOSH and WebSocket connections will use their secure
         *  variants if the current connection to the site is also secure (https).
         *
         *  BOSH options:
         *  -------------
         *
         *  By adding "sync" to the options, you can control if requests will
         *  be made synchronously or not. The default behaviour is asynchronous.
         *  If you want to make requests synchronous, make "sync" evaluate to true:
         *  > var conn = new Strophe.Connection("/http-bind/", {sync: true});
         *
         *  You can also toggle this on an already established connection:
         *  > conn.options.sync = true;
         *
         *  The "customHeaders" option can be used to provide custom HTTP headers to be
         *  included in the XMLHttpRequests made.
         *
         *  The "keepalive" option can be used to instruct Strophe to maintain the
         *  current BOSH session across interruptions such as webpage reloads.
         *
         *  It will do this by caching the sessions tokens in sessionStorage, and when
         *  "restore" is called it will check whether there are cached tokens with
         *  which it can resume an existing session.
         *
         *  The "withCredentials" option should receive a Boolean value and is used to
         *  indicate wether cookies should be included in ajax requests (by default
         *  they're not).
         *  Set this value to true if you are connecting to a BOSH service
         *  and for some reason need to send cookies to it.
         *  In order for this to work cross-domain, the server must also enable
         *  credentials by setting the Access-Control-Allow-Credentials response header
         *  to "true". For most usecases however this setting should be false (which
         *  is the default).
         *  Additionally, when using Access-Control-Allow-Credentials, the
         *  Access-Control-Allow-Origin header can't be set to the wildcard "*", but
         *  instead must be restricted to actual domains.
         *
         *  The "contentType" option can be set to change the default Content-Type
         *  of "text/xml; charset=utf-8", which can be useful to reduce the amount of
         *  CORS preflight requests that are sent to the server.
         *
         *  Parameters:
         *    (String) service - The BOSH or WebSocket service URL.
         *    (Object) options - A hash of configuration options
         *
         *  Returns:
         *    A new Strophe.Connection object.
         */
    Strophe.Connection = function (service, options) {
            // The service URL
      this.service = service
            // Configuration options
      this.options = options || {}
      var proto = this.options.protocol || ''

            // Select protocal based on service or options
      if (service.indexOf('ws:') === 0 || service.indexOf('wss:') === 0 ||
                proto.indexOf('ws') === 0) {
        this._proto = new Strophe.Websocket(this)
      } else {
        this._proto = new Strophe.Bosh(this)
      }

            /* The connected JID. */
      this.jid = ''
            /* the JIDs domain */
      this.domain = null
            /* stream:features */
      this.features = null

            // SASL
      this._sasl_data = {}
      this.do_session = false
      this.do_bind = false

            // handler lists
      this.timedHandlers = []
      this.handlers = []
      this.removeTimeds = []
      this.removeHandlers = []
      this.addTimeds = []
      this.addHandlers = []

      this._authentication = {}
      this._idleTimeout = null
      this._disconnectTimeout = null

      this.authenticated = false
      this.connected = false
      this.disconnecting = false
      this.do_authentication = true
      this.paused = false
      this.restored = false

      this._data = []
      this._uniqueId = 0

      this._sasl_success_handler = null
      this._sasl_failure_handler = null
      this._sasl_challenge_handler = null

            // Max retries before disconnecting
      this.maxRetries = 5

            // Call onIdle callback every 1/10th of a second
            // XXX: setTimeout should be called only with function expressions (23974bc1)
      this._idleTimeout = setTimeout(function () {
        this._onIdle()
      }.bind(this), 100)

      utils.addCookies(this.options.cookies)

            // initialize plugins
      for (var k in Strophe._connectionPlugins) {
        if (Strophe._connectionPlugins.hasOwnProperty(k)) {
          var ptype = Strophe._connectionPlugins[k]
                    // jslint complaints about the below line, but this is fine
          var F = function () {
          } // jshint ignore:line
          F.prototype = ptype
          this[k] = new F()
          this[k].init(this)
        }
      }
    }

    Strophe.Connection.prototype = {
            /** Function: reset
             *  Reset the connection.
             *
             *  This function should be called after a connection is disconnected
             *  before that connection is reused.
             */
      reset: function () {
        this._proto._reset()

                // SASL
        this.do_session = false
        this.do_bind = false

                // handler lists
        this.timedHandlers = []
        this.handlers = []
        this.removeTimeds = []
        this.removeHandlers = []
        this.addTimeds = []
        this.addHandlers = []
        this._authentication = {}

        this.authenticated = false
        this.connected = false
        this.disconnecting = false
        this.restored = false

        this._data = []
        this._requests = []
        this._uniqueId = 0
      },

            /** Function: pause
             *  Pause the request manager.
             *
             *  This will prevent Strophe from sending any more requests to the
             *  server.  This is very useful for temporarily pausing
             *  BOSH-Connections while a lot of send() calls are happening quickly.
             *  This causes Strophe to send the data in a single request, saving
             *  many request trips.
             */
      pause: function () {
        this.paused = true
      },

            /** Function: resume
             *  Resume the request manager.
             *
             *  This resumes after pause() has been called.
             */
      resume: function () {
        this.paused = false
      },

            /** Function: getUniqueId
             *  Generate a unique ID for use in <iq/> elements.
             *
             *  All <iq/> stanzas are required to have unique id attributes.  This
             *  function makes creating these easy.  Each connection instance has
             *  a counter which starts from zero, and the value of this counter
             *  plus a colon followed by the suffix becomes the unique id. If no
             *  suffix is supplied, the counter is used as the unique id.
             *
             *  Suffixes are used to make debugging easier when reading the stream
             *  data, and their use is recommended.  The counter resets to 0 for
             *  every new connection for the same reason.  For connections to the
             *  same server that authenticate the same way, all the ids should be
             *  the same, which makes it easy to see changes.  This is useful for
             *  automated testing as well.
             *
             *  Parameters:
             *    (String) suffix - A optional suffix to append to the id.
             *
             *  Returns:
             *    A unique string to be used for the id attribute.
             */
      getUniqueId: function (suffix) {
        var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
          var r = Math.random() * 16 | 0,
            v = c == 'x' ? r : r & 0x3 | 0x8
          return v.toString(16)
        })
        if (typeof (suffix) == 'string' || typeof (suffix) == 'number') {
          return uuid + ':' + suffix
        } else {
          return uuid + ''
        }
      },

            /** Function: connect
             *  Starts the connection process.
             *
             *  As the connection process proceeds, the user supplied callback will
             *  be triggered multiple times with status updates.  The callback
             *  should take two arguments - the status code and the error condition.
             *
             *  The status code will be one of the values in the Strophe.Status
             *  constants.  The error condition will be one of the conditions
             *  defined in RFC 3920 or the condition 'strophe-parsererror'.
             *
             *  The Parameters _wait_, _hold_ and _route_ are optional and only relevant
             *  for BOSH connections. Please see XEP 124 for a more detailed explanation
             *  of the optional parameters.
             *
             *  Parameters:
             *    (String) jid - The user's JID.  This may be a bare JID,
             *      or a full JID.  If a node is not supplied, SASL ANONYMOUS
             *      authentication will be attempted.
             *    (String) pass - The user's password.
             *    (Function) callback - The connect callback function.
             *    (Integer) wait - The optional HTTPBIND wait value.  This is the
             *      time the server will wait before returning an empty result for
             *      a request.  The default setting of 60 seconds is recommended.
             *    (Integer) hold - The optional HTTPBIND hold value.  This is the
             *      number of connections the server will hold at one time.  This
             *      should almost always be set to 1 (the default).
             *    (String) route - The optional route value.
             *    (String) authcid - The optional alternative authentication identity
             *      (username) if intending to impersonate another user.
             *      When using the SASL-EXTERNAL authentication mechanism, for example
             *      with client certificates, then the authcid value is used to
             *      determine whether an authorization JID (authzid) should be sent to
             *      the server. The authzid should not be sent to the server if the
             *      authzid and authcid are the same. So to prevent it from being sent
             *      (for example when the JID is already contained in the client
             *      certificate), set authcid to that same JID. See XEP-178 for more
             *      details.
             */
      connect: function (jid, pass, callback, wait, hold, route, authcid) {
        this.jid = jid
                /** Variable: authzid
                 *  Authorization identity.
                 */
        this.authzid = Strophe.getBareJidFromJid(this.jid)

                /** Variable: authcid
                 *  Authentication identity (User name).
                 */
        this.authcid = authcid || Strophe.getNodeFromJid(this.jid)

                /** Variable: pass
                 *  Authentication identity (User password).
                 */
        this.pass = pass

                /** Variable: servtype
                 *  Digest MD5 compatibility.
                 */
        this.servtype = 'xmpp'

        this.connect_callback = callback
        this.disconnecting = false
        this.connected = false
        this.authenticated = false
        this.restored = false

                // parse jid for domain
        this.domain = Strophe.getDomainFromJid(this.jid)

        this._changeConnectStatus(Strophe.Status.CONNECTING, null)

        this._proto._connect(wait, hold, route)
      },

            /** Function: attach
             *  Attach to an already created and authenticated BOSH session.
             *
             *  This function is provided to allow Strophe to attach to BOSH
             *  sessions which have been created externally, perhaps by a Web
             *  application.  This is often used to support auto-login type features
             *  without putting user credentials into the page.
             *
             *  Parameters:
             *    (String) jid - The full JID that is bound by the session.
             *    (String) sid - The SID of the BOSH session.
             *    (String) rid - The current RID of the BOSH session.  This RID
             *      will be used by the next request.
             *    (Function) callback The connect callback function.
             *    (Integer) wait - The optional HTTPBIND wait value.  This is the
             *      time the server will wait before returning an empty result for
             *      a request.  The default setting of 60 seconds is recommended.
             *      Other settings will require tweaks to the Strophe.TIMEOUT value.
             *    (Integer) hold - The optional HTTPBIND hold value.  This is the
             *      number of connections the server will hold at one time.  This
             *      should almost always be set to 1 (the default).
             *    (Integer) wind - The optional HTTBIND window value.  This is the
             *      allowed range of request ids that are valid.  The default is 5.
             */
      attach: function (jid, sid, rid, callback, wait, hold, wind) {
        if (this._proto instanceof Strophe.Bosh) {
          this._proto._attach(jid, sid, rid, callback, wait, hold, wind)
        } else {
          throw {
            name: 'StropheSessionError',
            message: 'The "attach" method can only be used with a BOSH connection.'
          }
        }
      },

            /** Function: restore
             *  Attempt to restore a cached BOSH session.
             *
             *  This function is only useful in conjunction with providing the
             *  "keepalive":true option when instantiating a new Strophe.Connection.
             *
             *  When "keepalive" is set to true, Strophe will cache the BOSH tokens
             *  RID (Request ID) and SID (Session ID) and then when this function is
             *  called, it will attempt to restore the session from those cached
             *  tokens.
             *
             *  This function must therefore be called instead of connect or attach.
             *
             *  For an example on how to use it, please see examples/restore.js
             *
             *  Parameters:
             *    (String) jid - The user's JID.  This may be a bare JID or a full JID.
             *    (Function) callback - The connect callback function.
             *    (Integer) wait - The optional HTTPBIND wait value.  This is the
             *      time the server will wait before returning an empty result for
             *      a request.  The default setting of 60 seconds is recommended.
             *    (Integer) hold - The optional HTTPBIND hold value.  This is the
             *      number of connections the server will hold at one time.  This
             *      should almost always be set to 1 (the default).
             *    (Integer) wind - The optional HTTBIND window value.  This is the
             *      allowed range of request ids that are valid.  The default is 5.
             */
      restore: function (jid, callback, wait, hold, wind) {
        if (this._sessionCachingSupported()) {
          this._proto._restore(jid, callback, wait, hold, wind)
        } else {
          throw {
            name: 'StropheSessionError',
            message: 'The "restore" method can only be used with a BOSH connection.'
          }
        }
      },

            /** PrivateFunction: _sessionCachingSupported
             * Checks whether sessionStorage and JSON are supported and whether we're
             * using BOSH.
             */
      _sessionCachingSupported: function () {
        if (this._proto instanceof Strophe.Bosh) {
          if (!JSON) {
            return false
          }
          try {
            window.sessionStorage.setItem('_strophe_', '_strophe_')
            window.sessionStorage.removeItem('_strophe_')
          } catch (e) {
            return false
          }
          return true
        }
        return false
      },

            /** Function: xmlInput
             *  User overrideable function that receives XML data coming into the
             *  connection.
             *
             *  The default function does nothing.  User code can override this with
             *  > Strophe.Connection.xmlInput = function (elem) {
     *  >   (user code)
     *  > };
             *
             *  Due to limitations of current Browsers' XML-Parsers the opening and closing
             *  <stream> tag for WebSocket-Connoctions will be passed as selfclosing here.
             *
             *  BOSH-Connections will have all stanzas wrapped in a <body> tag. See
             *  <Strophe.Bosh.strip> if you want to strip this tag.
             *
             *  Parameters:
             *    (XMLElement) elem - The XML data received by the connection.
             */
            /* jshint unused:false */
      xmlInput: function (elem) {
        return
      },
            /* jshint unused:true */

            /** Function: xmlOutput
             *  User overrideable function that receives XML data sent to the
             *  connection.
             *
             *  The default function does nothing.  User code can override this with
             *  > Strophe.Connection.xmlOutput = function (elem) {
     *  >   (user code)
     *  > };
             *
             *  Due to limitations of current Browsers' XML-Parsers the opening and closing
             *  <stream> tag for WebSocket-Connoctions will be passed as selfclosing here.
             *
             *  BOSH-Connections will have all stanzas wrapped in a <body> tag. See
             *  <Strophe.Bosh.strip> if you want to strip this tag.
             *
             *  Parameters:
             *    (XMLElement) elem - The XMLdata sent by the connection.
             */
            /* jshint unused:false */
      xmlOutput: function (elem) {
        return
      },
            /* jshint unused:true */

            /** Function: rawInput
             *  User overrideable function that receives raw data coming into the
             *  connection.
             *
             *  The default function does nothing.  User code can override this with
             *  > Strophe.Connection.rawInput = function (data) {
     *  >   (user code)
     *  > };
             *
             *  Parameters:
             *    (String) data - The data received by the connection.
             */
            /* jshint unused:false */
      rawInput: function (data) {
        return
      },
            /* jshint unused:true */

            /** Function: rawOutput
             *  User overrideable function that receives raw data sent to the
             *  connection.
             *
             *  The default function does nothing.  User code can override this with
             *  > Strophe.Connection.rawOutput = function (data) {
     *  >   (user code)
     *  > };
             *
             *  Parameters:
             *    (String) data - The data sent by the connection.
             */
            /* jshint unused:false */
      rawOutput: function (data) {
        return
      },
            /* jshint unused:true */

            /** Function: nextValidRid
             *  User overrideable function that receives the new valid rid.
             *
             *  The default function does nothing. User code can override this with
             *  > Strophe.Connection.nextValidRid = function (rid) {
     *  >    (user code)
     *  > };
             *
             *  Parameters:
             *    (Number) rid - The next valid rid
             */
            /* jshint unused:false */
      nextValidRid: function (rid) {
        return
      },
            /* jshint unused:true */

            /** Function: send
             *  Send a stanza.
             *
             *  This function is called to push data onto the send queue to
             *  go out over the wire.  Whenever a request is sent to the BOSH
             *  server, all pending data is sent and the queue is flushed.
             *
             *  Parameters:
             *    (XMLElement |
             *     [XMLElement] |
             *     Strophe.Builder) elem - The stanza to send.
             */
      send: function (elem) {
        if (elem === null) {
          return
        }
        if (typeof (elem.sort) === 'function') {
          for (var i = 0; i < elem.length; i++) {
            this._queueData(elem[i])
          }
        } else if (typeof (elem.tree) === 'function') {
          this._queueData(elem.tree())
        } else {
          this._queueData(elem)
        }

        this._proto._send()
      },

            /** Function: flush
             *  Immediately send any pending outgoing data.
             *
             *  Normally send() queues outgoing data until the next idle period
             *  (100ms), which optimizes network use in the common cases when
             *  several send()s are called in succession. flush() can be used to
             *  immediately send all pending data.
             */
      flush: function () {
                // cancel the pending idle period and run the idle function
                // immediately
        clearTimeout(this._idleTimeout)
        this._onIdle()
      },

            /** Function: sendIQ
             *  Helper function to send IQ stanzas.
             *
             *  Parameters:
             *    (XMLElement) elem - The stanza to send.
             *    (Function) callback - The callback function for a successful request.
             *    (Function) errback - The callback function for a failed or timed
             *      out request.  On timeout, the stanza will be null.
             *    (Integer) timeout - The time specified in milliseconds for a
             *      timeout to occur.
             *
             *  Returns:
             *    The id used to send the IQ.
             */
      sendIQ: function (elem, callback, errback, timeout) {
        var timeoutHandler = null
        var that = this

        if (typeof (elem.tree) === 'function') {
          elem = elem.tree()
        }
        var id = elem.getAttribute('id')

                // inject id if not found
        if (!id) {
          id = this.getUniqueId('sendIQ')
          elem.setAttribute('id', id)
        }

        var expectedFrom = elem.getAttribute('to')
        var fulljid = this.jid

        var handler = this.addHandler(function (stanza) {
                    // remove timeout handler if there is one
          if (timeoutHandler) {
            that.deleteTimedHandler(timeoutHandler)
          }

          var acceptable = false
          var from = stanza.getAttribute('from')
          if (from === expectedFrom ||
                        (!expectedFrom &&
                        (from === Strophe.getBareJidFromJid(fulljid) ||
                        from === Strophe.getDomainFromJid(fulljid) ||
                        from === fulljid))) {
            acceptable = true
          }

          if (!acceptable) {
            throw {
              name: 'StropheError',
              message: 'Got answer to IQ from wrong jid:' + from +
                            '\nExpected jid: ' + expectedFrom
            }
          }

          var iqtype = stanza.getAttribute('type')
          if (iqtype == 'result') {
            if (callback) {
              callback(stanza)
            }
          } else if (iqtype == 'error') {
            if (errback) {
              errback(stanza)
            }
          } else {
            throw {
              name: 'StropheError',
              message: 'Got bad IQ type of ' + iqtype
            }
          }
        }, null, 'iq', ['error', 'result'], id)

                // if timeout specified, setup timeout handler.
        if (timeout) {
          timeoutHandler = this.addTimedHandler(timeout, function () {
                        // get rid of normal handler
            that.deleteHandler(handler)
                        // call errback on timeout with null stanza
            if (errback) {
              errback(null)
            }
            return false
          })
        }
        this.send(elem)
        return id
      },

            /** PrivateFunction: _queueData
             *  Queue outgoing data for later sending.  Also ensures that the data
             *  is a DOMElement.
             */
      _queueData: function (element) {
        if (element === null || !element.tagName || !element.childNodes) {
          throw {
            name: 'StropheError',
            message: 'Cannot queue non-DOMElement.'
          }
        }
        this._data.push(element)
      },

            /** PrivateFunction: _sendRestart
             *  Send an xmpp:restart stanza.
             */
      _sendRestart: function () {
        this._data.push('restart')
        this._proto._sendRestart()
                // XXX: setTimeout should be called only with function expressions (23974bc1)
        this._idleTimeout = setTimeout(function () {
          this._onIdle()
        }.bind(this), 100)
      },

            /** Function: addTimedHandler
             *  Add a timed handler to the connection.
             *
             *  This function adds a timed handler.  The provided handler will
             *  be called every period milliseconds until it returns false,
             *  the connection is terminated, or the handler is removed.  Handlers
             *  that wish to continue being invoked should return true.
             *
             *  Because of method binding it is necessary to save the result of
             *  this function if you wish to remove a handler with
             *  deleteTimedHandler().
             *
             *  Note that user handlers are not active until authentication is
             *  successful.
             *
             *  Parameters:
             *    (Integer) period - The period of the handler.
             *    (Function) handler - The callback function.
             *
             *  Returns:
             *    A reference to the handler that can be used to remove it.
             */
      addTimedHandler: function (period, handler) {
        var thand = new Strophe.TimedHandler(period, handler)
        this.addTimeds.push(thand)
        return thand
      },

            /** Function: deleteTimedHandler
             *  Delete a timed handler for a connection.
             *
             *  This function removes a timed handler from the connection.  The
             *  handRef parameter is *not* the function passed to addTimedHandler(),
             *  but is the reference returned from addTimedHandler().
             *
             *  Parameters:
             *    (Strophe.TimedHandler) handRef - The handler reference.
             */
      deleteTimedHandler: function (handRef) {
                // this must be done in the Idle loop so that we don't change
                // the handlers during iteration
        this.removeTimeds.push(handRef)
      },

            /** Function: addHandler
             *  Add a stanza handler for the connection.
             *
             *  This function adds a stanza handler to the connection.  The
             *  handler callback will be called for any stanza that matches
             *  the parameters.  Note that if multiple parameters are supplied,
             *  they must all match for the handler to be invoked.
             *
             *  The handler will receive the stanza that triggered it as its argument.
             *  *The handler should return true if it is to be invoked again;
             *  returning false will remove the handler after it returns.*
             *
             *  As a convenience, the ns parameters applies to the top level element
             *  and also any of its immediate children.  This is primarily to make
             *  matching /iq/query elements easy.
             *
             *  The options argument contains handler matching flags that affect how
             *  matches are determined. Currently the only flag is matchBare (a
             *  boolean). When matchBare is true, the from parameter and the from
             *  attribute on the stanza will be matched as bare JIDs instead of
             *  full JIDs. To use this, pass {matchBare: true} as the value of
             *  options. The default value for matchBare is false.
             *
             *  The return value should be saved if you wish to remove the handler
             *  with deleteHandler().
             *
             *  Parameters:
             *    (Function) handler - The user callback.
             *    (String) ns - The namespace to match.
             *    (String) name - The stanza name to match.
             *    (String) type - The stanza type attribute to match.
             *    (String) id - The stanza id attribute to match.
             *    (String) from - The stanza from attribute to match.
             *    (String) options - The handler options
             *
             *  Returns:
             *    A reference to the handler that can be used to remove it.
             */
      addHandler: function (handler, ns, name, type, id, from, options) {
        var hand = new Strophe.Handler(handler, ns, name, type, id, from, options)
        this.addHandlers.push(hand)
        return hand
      },

            /** Function: deleteHandler
             *  Delete a stanza handler for a connection.
             *
             *  This function removes a stanza handler from the connection.  The
             *  handRef parameter is *not* the function passed to addHandler(),
             *  but is the reference returned from addHandler().
             *
             *  Parameters:
             *    (Strophe.Handler) handRef - The handler reference.
             */
      deleteHandler: function (handRef) {
                // this must be done in the Idle loop so that we don't change
                // the handlers during iteration
        this.removeHandlers.push(handRef)
                // If a handler is being deleted while it is being added,
                // prevent it from getting added
        var i = this.addHandlers.indexOf(handRef)
        if (i >= 0) {
          this.addHandlers.splice(i, 1)
        }
      },

            /** Function: disconnect
             *  Start the graceful disconnection process.
             *
             *  This function starts the disconnection process.  This process starts
             *  by sending unavailable presence and sending BOSH body of type
             *  terminate.  A timeout handler makes sure that disconnection happens
             *  even if the BOSH server does not respond.
             *  If the Connection object isn't connected, at least tries to abort all pending requests
             *  so the connection object won't generate successful requests (which were already opened).
             *
             *  The user supplied connection callback will be notified of the
             *  progress as this process happens.
             *
             *  Parameters:
             *    (String) reason - The reason the disconnect is occuring.
             */
      disconnect: function (reason) {
        this._changeConnectStatus(Strophe.Status.DISCONNECTING, reason)

        Strophe.info('Disconnect was called because: ' + reason)
        if (this.connected) {
          var pres = false
          this.disconnecting = true
          if (this.authenticated) {
            pres = $pres({
              xmlns: Strophe.NS.CLIENT,
              type: 'unavailable'
            })
          }
                    // setup timeout handler
          this._disconnectTimeout = this._addSysTimedHandler(
                        3000, this._onDisconnectTimeout.bind(this))
          this._proto._disconnect(pres)
        } else {
          Strophe.info('Disconnect was called before Strophe connected to the server')
          this._proto._abortAllRequests()
        }
      },

            /** PrivateFunction: _changeConnectStatus
             *  _Private_ helper function that makes sure plugins and the user's
             *  callback are notified of connection status changes.
             *
             *  Parameters:
             *    (Integer) status - the new connection status, one of the values
             *      in Strophe.Status
             *    (String) condition - the error condition or null
             */
      _changeConnectStatus: function (status, condition) {
                // notify all plugins listening for status changes
        for (var k in Strophe._connectionPlugins) {
          if (Strophe._connectionPlugins.hasOwnProperty(k)) {
            var plugin = this[k]
            if (plugin.statusChanged) {
              try {
                plugin.statusChanged(status, condition)
              } catch (err) {
                Strophe.error('' + k + ' plugin caused an exception ' +
                                    'changing status: ' + err)
              }
            }
          }
        }

                // notify the user's callback
        if (this.connect_callback) {
          try {
            this.connect_callback(status, condition)
          } catch (e) {
            Strophe.error('User connection callback caused an ' +
                            'exception: ' + e)
          }
        }
      },

            /** PrivateFunction: _doDisconnect
             *  _Private_ function to disconnect.
             *
             *  This is the last piece of the disconnection logic.  This resets the
             *  connection and alerts the user's connection callback.
             */
      _doDisconnect: function (condition) {
        if (typeof this._idleTimeout == 'number') {
          clearTimeout(this._idleTimeout)
        }

                // Cancel Disconnect Timeout
        if (this._disconnectTimeout !== null) {
          this.deleteTimedHandler(this._disconnectTimeout)
          this._disconnectTimeout = null
        }

        Strophe.info('_doDisconnect was called')
        this._proto._doDisconnect()

        this.authenticated = false
        this.disconnecting = false
        this.restored = false

                // delete handlers
        this.handlers = []
        this.timedHandlers = []
        this.removeTimeds = []
        this.removeHandlers = []
        this.addTimeds = []
        this.addHandlers = []

                // tell the parent we disconnected
        this._changeConnectStatus(Strophe.Status.DISCONNECTED, condition)
        this.connected = false
      },

            /** PrivateFunction: _dataRecv
             *  _Private_ handler to processes incoming data from the the connection.
             *
             *  Except for _connect_cb handling the initial connection request,
             *  this function handles the incoming data for all requests.  This
             *  function also fires stanza handlers that match each incoming
             *  stanza.
             *
             *  Parameters:
             *    (Strophe.Request) req - The request that has data ready.
             *    (string) req - The stanza a raw string (optiona).
             */
      _dataRecv: function (req, raw) {
        Strophe.info('_dataRecv called')
        WebIM && WebIM.config.isDebug && Strophe.info(raw)
        var elem = this._proto._reqToData(req)
        if (elem === null) {
          return
        }

        if (this.xmlInput !== Strophe.Connection.prototype.xmlInput) {
          if (elem.nodeName === this._proto.strip && elem.childNodes.length) {
            this.xmlInput(elem.childNodes[0])
          } else {
            this.xmlInput(elem)
          }
        }
        if (this.rawInput !== Strophe.Connection.prototype.rawInput) {
          if (raw) {
            this.rawInput(raw)
          } else {
            this.rawInput(Strophe.serialize(elem))
          }
        }

                // remove handlers scheduled for deletion
        var i, hand
        while (this.removeHandlers.length > 0) {
          hand = this.removeHandlers.pop()
          i = this.handlers.indexOf(hand)
          if (i >= 0) {
            this.handlers.splice(i, 1)
          }
        }

                // add handlers scheduled for addition
        while (this.addHandlers.length > 0) {
          this.handlers.push(this.addHandlers.pop())
        }

                // handle graceful disconnect
        if (this.disconnecting && this._proto._emptyQueue()) {
          this._doDisconnect()
          return
        }

        var type = elem.getAttribute('type')
        var cond, conflict
        if (type !== null && type == 'terminate') {
                    // Don't process stanzas that come in after disconnect
          if (this.disconnecting) {
            return
          }

                    // an error occurred
          cond = elem.getAttribute('condition')
          conflict = elem.getElementsByTagName('conflict')
          if (cond !== null) {
            if (cond == 'remote-stream-error' && conflict.length > 0) {
              cond = 'conflict'
            }
            this._changeConnectStatus(Strophe.Status.CONNFAIL, cond)
          } else {
            this._changeConnectStatus(Strophe.Status.CONNFAIL, 'unknown')
          }
          this._doDisconnect(cond)
          return
        }

                // send each incoming stanza through the handler chain
        var that = this
        Strophe.forEachChild(elem, null, function (child) {
          var i, newList
                    // process handlers
          newList = that.handlers
          that.handlers = []
          for (i = 0; i < newList.length; i++) {
            var hand = newList[i]
                        // encapsulate 'handler.run' not to lose the whole handler list if
                        // one of the handlers throws an exception
            try {
              if (hand.isMatch(child) &&
                                (that.authenticated || !hand.user)) {
                if (hand.run(child)) {
                  that.handlers.push(hand)
                }
              } else {
                that.handlers.push(hand)
              }
            } catch (e) {
                            // if the handler throws an exception, we consider it as false
              Strophe.warn('Removing Strophe handlers due to uncaught exception: ' + e.message)
            }
          }
        })
      },

            /** Attribute: mechanisms
             *  SASL Mechanisms available for Conncection.
             */
      mechanisms: {},

            /** PrivateFunction: _connect_cb
             *  _Private_ handler for initial connection request.
             *
             *  This handler is used to process the initial connection request
             *  response from the BOSH server. It is used to set up authentication
             *  handlers and start the authentication process.
             *
             *  SASL authentication will be attempted if available, otherwise
             *  the code will fall back to legacy authentication.
             *
             *  Parameters:
             *    (Strophe.Request) req - The current request.
             *    (Function) _callback - low level (xmpp) connect callback function.
             *      Useful for plugins with their own xmpp connect callback (when their)
             *      want to do something special).
             */
      _connect_cb: function (req, _callback, raw) {
        Strophe.info('_connect_cb was called')

        this.connected = true

        var bodyWrap
        try {
          bodyWrap = this._proto._reqToData(req)
        } catch (e) {
          if (e != 'badformat') {
            throw e
          }
          this._changeConnectStatus(Strophe.Status.CONNFAIL, 'bad-format')
          this._doDisconnect('bad-format')
        }
        if (!bodyWrap) {
          return
        }

        if (this.xmlInput !== Strophe.Connection.prototype.xmlInput) {
          if (bodyWrap.nodeName === this._proto.strip && bodyWrap.childNodes.length) {
            this.xmlInput(bodyWrap.childNodes[0])
          } else {
            this.xmlInput(bodyWrap)
          }
        }
        if (this.rawInput !== Strophe.Connection.prototype.rawInput) {
          if (raw) {
            this.rawInput(raw)
          } else {
            this.rawInput(Strophe.serialize(bodyWrap))
          }
        }

        var conncheck = this._proto._connect_cb(bodyWrap)
        if (conncheck === Strophe.Status.CONNFAIL) {
          return
        }

        this._authentication.sasl_scram_sha1 = false
        this._authentication.sasl_plain = false
        this._authentication.sasl_digest_md5 = false
        this._authentication.sasl_anonymous = false
        this._authentication.legacy_auth = false

                // Check for the stream:features tag
        var hasFeatures
        if (bodyWrap.getElementsByTagNameNS) {
          hasFeatures = bodyWrap.getElementsByTagNameNS(Strophe.NS.STREAM, 'features').length > 0
        } else {
          hasFeatures = bodyWrap.getElementsByTagName('stream:features').length > 0 || bodyWrap.getElementsByTagName('features').length > 0
        }
        var mechanisms = bodyWrap.getElementsByTagName('mechanism')
        var matched = []
        var i, mech, found_authentication = false
        if (!hasFeatures) {
          this._proto._no_auth_received(_callback)
          return
        }
        if (mechanisms.length > 0) {
          for (i = 0; i < mechanisms.length; i++) {
            mech = Strophe.getText(mechanisms[i])
            if (this.mechanisms[mech]) matched.push(this.mechanisms[mech])
          }
        }
        this._authentication.legacy_auth =
                    bodyWrap.getElementsByTagName('auth').length > 0
        found_authentication = this._authentication.legacy_auth ||
                    matched.length > 0
        if (!found_authentication) {
          this._proto._no_auth_received(_callback)
          return
        }
        if (this.do_authentication !== false)
                  { this.authenticate(matched) }
      },

            /** Function: authenticate
             * Set up authentication
             *
             *  Contiunues the initial connection request by setting up authentication
             *  handlers and start the authentication process.
             *
             *  SASL authentication will be attempted if available, otherwise
             *  the code will fall back to legacy authentication.
             *
             */
      authenticate: function (matched) {
        var i
                // Sorting matched mechanisms according to priority.
        for (i = 0; i < matched.length - 1; ++i) {
          var higher = i
          for (var j = i + 1; j < matched.length; ++j) {
            if (matched[j].prototype.priority > matched[higher].prototype.priority) {
              higher = j
            }
          }
          if (higher != i) {
            var swap = matched[i]
            matched[i] = matched[higher]
            matched[higher] = swap
          }
        }

                // run each mechanism
        var mechanism_found = false
        for (i = 0; i < matched.length; ++i) {
          if (!matched[i].prototype.test(this)) continue

          this._sasl_success_handler = this._addSysHandler(
                        this._sasl_success_cb.bind(this), null,
                        'success', null, null)
          this._sasl_failure_handler = this._addSysHandler(
                        this._sasl_failure_cb.bind(this), null,
                        'failure', null, null)
          this._sasl_challenge_handler = this._addSysHandler(
                        this._sasl_challenge_cb.bind(this), null,
                        'challenge', null, null)

          this._sasl_mechanism = new matched[i]()
          this._sasl_mechanism.onStart(this)

          var request_auth_exchange = $build('auth', {
            xmlns: Strophe.NS.SASL,
            mechanism: this._sasl_mechanism.name
          })

          if (this._sasl_mechanism.isClientFirst) {
            var response = this._sasl_mechanism.onChallenge(this, null)
            request_auth_exchange.t(Base64.encode(response))
          }
          this.send(request_auth_exchange.tree())
          mechanism_found = true
          break
        }

        if (!mechanism_found) {
                    // if none of the mechanism worked
          if (Strophe.getNodeFromJid(this.jid) === null) {
                        // we don't have a node, which is required for non-anonymous
                        // client connections
            this._changeConnectStatus(Strophe.Status.CONNFAIL,
                            'x-strophe-bad-non-anon-jid')
            this.disconnect('x-strophe-bad-non-anon-jid')
          } else {
                        // fall back to legacy authentication
            this._changeConnectStatus(Strophe.Status.AUTHENTICATING, null)
            this._addSysHandler(this._auth1_cb.bind(this), null, null,
                            null, '_auth_1')
            this.send($iq({
              type: 'get',
              to: this.domain,
              id: '_auth_1'
            }).c('query', {
              xmlns: Strophe.NS.AUTH
            }).c('username', {}).t(Strophe.getNodeFromJid(this.jid)).tree())
          }
        }
      },

      _sasl_challenge_cb: function (elem) {
        var challenge = Base64.decode(Strophe.getText(elem))
        var response = this._sasl_mechanism.onChallenge(this, challenge)
        var stanza = $build('response', {
          xmlns: Strophe.NS.SASL
        })
        if (response !== '') {
          stanza.t(Base64.encode(response))
        }
        this.send(stanza.tree())
        return true
      },

            /** PrivateFunction: _auth1_cb
             *  _Private_ handler for legacy authentication.
             *
             *  This handler is called in response to the initial <iq type='get'/>
             *  for legacy authentication.  It builds an authentication <iq/> and
             *  sends it, creating a handler (calling back to _auth2_cb()) to
             *  handle the result
             *
             *  Parameters:
             *    (XMLElement) elem - The stanza that triggered the callback.
             *
             *  Returns:
             *    false to remove the handler.
             */
            /* jshint unused:false */
      _auth1_cb: function (elem) {
                // build plaintext auth iq
        var iq = $iq({type: 'set', id: '_auth_2'})
                    .c('query', {xmlns: Strophe.NS.AUTH})
                    .c('username', {}).t(Strophe.getNodeFromJid(this.jid))
                    .up()
                    .c('password').t(this.pass)

        if (!Strophe.getResourceFromJid(this.jid)) {
                    // since the user has not supplied a resource, we pick
                    // a default one here.  unlike other auth methods, the server
                    // cannot do this for us.
          this.jid = Strophe.getBareJidFromJid(this.jid) + '/strophe'
        }
        iq.up().c('resource', {}).t(Strophe.getResourceFromJid(this.jid))

        this._addSysHandler(this._auth2_cb.bind(this), null,
                    null, null, '_auth_2')
        this.send(iq.tree())
        return false
      },
            /* jshint unused:true */

            /** PrivateFunction: _sasl_success_cb
             *  _Private_ handler for succesful SASL authentication.
             *
             *  Parameters:
             *    (XMLElement) elem - The matching stanza.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _sasl_success_cb: function (elem) {
        if (this._sasl_data['server-signature']) {
          var serverSignature
          var success = Base64.decode(Strophe.getText(elem))
          var attribMatch = /([a-z]+)=([^,]+)(,|$)/
          var matches = success.match(attribMatch)
          if (matches[1] == 'v') {
            serverSignature = matches[2]
          }

          if (serverSignature != this._sasl_data['server-signature']) {
                        // remove old handlers
            this.deleteHandler(this._sasl_failure_handler)
            this._sasl_failure_handler = null
            if (this._sasl_challenge_handler) {
              this.deleteHandler(this._sasl_challenge_handler)
              this._sasl_challenge_handler = null
            }

            this._sasl_data = {}
            return this._sasl_failure_cb(null)
          }
        }

        Strophe.info('SASL authentication succeeded.')

        if (this._sasl_mechanism) {
          this._sasl_mechanism.onSuccess()
        }

                // remove old handlers
        this.deleteHandler(this._sasl_failure_handler)
        this._sasl_failure_handler = null
        if (this._sasl_challenge_handler) {
          this.deleteHandler(this._sasl_challenge_handler)
          this._sasl_challenge_handler = null
        }

        var streamfeature_handlers = []
        var wrapper = function (handlers, elem) {
          while (handlers.length) {
            this.deleteHandler(handlers.pop())
          }
          this._sasl_auth1_cb.bind(this)(elem)
          return false
        }
        streamfeature_handlers.push(this._addSysHandler(function (elem) {
          wrapper.bind(this)(streamfeature_handlers, elem)
        }.bind(this), null, 'stream:features', null, null))
        streamfeature_handlers.push(this._addSysHandler(function (elem) {
          wrapper.bind(this)(streamfeature_handlers, elem)
        }.bind(this), Strophe.NS.STREAM, 'features', null, null))

                // we must send an xmpp:restart now
        this._sendRestart()

        return false
      },

            /** PrivateFunction: _sasl_auth1_cb
             *  _Private_ handler to start stream binding.
             *
             *  Parameters:
             *    (XMLElement) elem - The matching stanza.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _sasl_auth1_cb: function (elem) {
                // save stream:features for future usage
        this.features = elem
        var i, child
        for (i = 0; i < elem.childNodes.length; i++) {
          child = elem.childNodes[i]
          if (child.nodeName == 'bind') {
            this.do_bind = true
          }

          if (child.nodeName == 'session') {
            this.do_session = true
          }
        }

        if (!this.do_bind) {
          this._changeConnectStatus(Strophe.Status.AUTHFAIL, null)
          return false
        } else {
          this._addSysHandler(this._sasl_bind_cb.bind(this), null, null,
                        null, '_bind_auth_2')

          var resource = Strophe.getResourceFromJid(this.jid)
          if (resource) {
            this.send($iq({type: 'set', id: '_bind_auth_2'})
                            .c('bind', {xmlns: Strophe.NS.BIND})
                            .c('resource', {}).t(resource).tree())
          } else {
            this.send($iq({type: 'set', id: '_bind_auth_2'})
                            .c('bind', {xmlns: Strophe.NS.BIND})
                            .tree())
          }
        }
        return false
      },

            /** PrivateFunction: _sasl_bind_cb
             *  _Private_ handler for binding result and session start.
             *
             *  Parameters:
             *    (XMLElement) elem - The matching stanza.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _sasl_bind_cb: function (elem) {
        if (elem.getAttribute('type') == 'error') {
          Strophe.info('SASL binding failed.')
          var conflict = elem.getElementsByTagName('conflict'), condition
          if (conflict.length > 0) {
            condition = 'conflict'
          }
          this._changeConnectStatus(Strophe.Status.AUTHFAIL, condition)
          return false
        }

                // TODO - need to grab errors
        var bind = elem.getElementsByTagName('bind')
        var jidNode
        if (bind.length > 0) {
                    // Grab jid
          jidNode = bind[0].getElementsByTagName('jid')
          if (jidNode.length > 0) {
            this.jid = Strophe.getText(jidNode[0])

            if (this.do_session) {
              this._addSysHandler(this._sasl_session_cb.bind(this),
                                null, null, null, '_session_auth_2')

              this.send($iq({type: 'set', id: '_session_auth_2'})
                                .c('session', {xmlns: Strophe.NS.SESSION})
                                .tree())
            } else {
              this.authenticated = true
              this._changeConnectStatus(Strophe.Status.CONNECTED, null)
            }
          }
        } else {
          Strophe.info('SASL binding failed.')
          this._changeConnectStatus(Strophe.Status.AUTHFAIL, null)
          return false
        }
      },

            /** PrivateFunction: _sasl_session_cb
             *  _Private_ handler to finish successful SASL connection.
             *
             *  This sets Connection.authenticated to true on success, which
             *  starts the processing of user handlers.
             *
             *  Parameters:
             *    (XMLElement) elem - The matching stanza.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _sasl_session_cb: function (elem) {
        if (elem.getAttribute('type') == 'result') {
          this.authenticated = true
          this._changeConnectStatus(Strophe.Status.CONNECTED, null)
        } else if (elem.getAttribute('type') == 'error') {
          Strophe.info('Session creation failed.')
          this._changeConnectStatus(Strophe.Status.AUTHFAIL, null)
          return false
        }
        return false
      },

            /** PrivateFunction: _sasl_failure_cb
             *  _Private_ handler for SASL authentication failure.
             *
             *  Parameters:
             *    (XMLElement) elem - The matching stanza.
             *
             *  Returns:
             *    false to remove the handler.
             */
            /* jshint unused:false */
      _sasl_failure_cb: function (elem) {
                // delete unneeded handlers
        if (this._sasl_success_handler) {
          this.deleteHandler(this._sasl_success_handler)
          this._sasl_success_handler = null
        }
        if (this._sasl_challenge_handler) {
          this.deleteHandler(this._sasl_challenge_handler)
          this._sasl_challenge_handler = null
        }

        if (this._sasl_mechanism)
                  { this._sasl_mechanism.onFailure() }
        this._changeConnectStatus(Strophe.Status.AUTHFAIL, null)
        return false
      },
            /* jshint unused:true */

            /** PrivateFunction: _auth2_cb
             *  _Private_ handler to finish legacy authentication.
             *
             *  This handler is called when the result from the jabber:iq:auth
             *  <iq/> stanza is returned.
             *
             *  Parameters:
             *    (XMLElement) elem - The stanza that triggered the callback.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _auth2_cb: function (elem) {
        if (elem.getAttribute('type') == 'result') {
          this.authenticated = true
          this._changeConnectStatus(Strophe.Status.CONNECTED, null)
        } else if (elem.getAttribute('type') == 'error') {
          this._changeConnectStatus(Strophe.Status.AUTHFAIL, null)
          this.disconnect('authentication failed')
        }
        return false
      },

            /** PrivateFunction: _addSysTimedHandler
             *  _Private_ function to add a system level timed handler.
             *
             *  This function is used to add a Strophe.TimedHandler for the
             *  library code.  System timed handlers are allowed to run before
             *  authentication is complete.
             *
             *  Parameters:
             *    (Integer) period - The period of the handler.
             *    (Function) handler - The callback function.
             */
      _addSysTimedHandler: function (period, handler) {
        var thand = new Strophe.TimedHandler(period, handler)
        thand.user = false
        this.addTimeds.push(thand)
        return thand
      },

            /** PrivateFunction: _addSysHandler
             *  _Private_ function to add a system level stanza handler.
             *
             *  This function is used to add a Strophe.Handler for the
             *  library code.  System stanza handlers are allowed to run before
             *  authentication is complete.
             *
             *  Parameters:
             *    (Function) handler - The callback function.
             *    (String) ns - The namespace to match.
             *    (String) name - The stanza name to match.
             *    (String) type - The stanza type attribute to match.
             *    (String) id - The stanza id attribute to match.
             */
      _addSysHandler: function (handler, ns, name, type, id) {
        var hand = new Strophe.Handler(handler, ns, name, type, id)
        hand.user = false
        this.addHandlers.push(hand)
        return hand
      },

            /** PrivateFunction: _onDisconnectTimeout
             *  _Private_ timeout handler for handling non-graceful disconnection.
             *
             *  If the graceful disconnect process does not complete within the
             *  time allotted, this handler finishes the disconnect anyway.
             *
             *  Returns:
             *    false to remove the handler.
             */
      _onDisconnectTimeout: function () {
        Strophe.info('_onDisconnectTimeout was called')
        this._changeConnectStatus(Strophe.Status.CONNTIMEOUT, null)
        this._proto._onDisconnectTimeout()
                // actually disconnect
        this._doDisconnect()
        return false
      },

            /** PrivateFunction: _onIdle
             *  _Private_ handler to process events during idle cycle.
             *
             *  This handler is called every 100ms to fire timed handlers that
             *  are ready and keep poll requests going.
             */
      _onIdle: function () {
        var i, thand, since, newList

                // add timed handlers scheduled for addition
                // NOTE: we add before remove in the case a timed handler is
                // added and then deleted before the next _onIdle() call.
        while (this.addTimeds.length > 0) {
          this.timedHandlers.push(this.addTimeds.pop())
        }

                // remove timed handlers that have been scheduled for deletion
        while (this.removeTimeds.length > 0) {
          thand = this.removeTimeds.pop()
          i = this.timedHandlers.indexOf(thand)
          if (i >= 0) {
            this.timedHandlers.splice(i, 1)
          }
        }

                // call ready timed handlers
        var now = new Date().getTime()
        newList = []
        for (i = 0; i < this.timedHandlers.length; i++) {
          thand = this.timedHandlers[i]
          if (this.authenticated || !thand.user) {
            since = thand.lastCalled + thand.period
            if (since - now <= 0) {
              if (thand.run()) {
                newList.push(thand)
              }
            } else {
              newList.push(thand)
            }
          }
        }
        this.timedHandlers = newList

        clearTimeout(this._idleTimeout)

        this._proto._onIdle()

                // reactivate the timer only if connected
        if (this.connected) {
                    // XXX: setTimeout should be called only with function expressions (23974bc1)
          this._idleTimeout = setTimeout(function () {
            this._onIdle()
          }.bind(this), 100)
        }
      }
    }

        /** Class: Strophe.SASLMechanism
         *
         *  encapsulates SASL authentication mechanisms.
         *
         *  User code may override the priority for each mechanism or disable it completely.
         *  See <priority> for information about changing priority and <test> for informatian on
         *  how to disable a mechanism.
         *
         *  By default, all mechanisms are enabled and the priorities are
         *
         *  EXTERNAL - 60
         *  OAUTHBEARER - 50
         *  SCRAM-SHA1 - 40
         *  DIGEST-MD5 - 30
         *  PLAIN - 20
         *  ANONYMOUS - 10
         */

        /**
         * PrivateConstructor: Strophe.SASLMechanism
         * SASL auth mechanism abstraction.
         *
         *  Parameters:
         *    (String) name - SASL Mechanism name.
         *    (Boolean) isClientFirst - If client should send response first without challenge.
         *    (Number) priority - Priority.
         *
         *  Returns:
         *    A new Strophe.SASLMechanism object.
         */
    Strophe.SASLMechanism = function (name, isClientFirst, priority) {
            /** PrivateVariable: name
             *  Mechanism name.
             */
      this.name = name
            /** PrivateVariable: isClientFirst
             *  If client sends response without initial server challenge.
             */
      this.isClientFirst = isClientFirst
            /** Variable: priority
             *  Determines which <SASLMechanism> is chosen for authentication (Higher is better).
             *  Users may override this to prioritize mechanisms differently.
             *
             *  In the default configuration the priorities are
             *
             *  SCRAM-SHA1 - 40
             *  DIGEST-MD5 - 30
             *  Plain - 20
             *
             *  Example: (This will cause Strophe to choose the mechanism that the server sent first)
             *
             *  > Strophe.SASLMD5.priority = Strophe.SASLSHA1.priority;
             *
             *  See <SASL mechanisms> for a list of available mechanisms.
             *
             */
      this.priority = priority
    }

    Strophe.SASLMechanism.prototype = {
            /**
             *  Function: test
             *  Checks if mechanism able to run.
             *  To disable a mechanism, make this return false;
             *
             *  To disable plain authentication run
             *  > Strophe.SASLPlain.test = function() {
   *  >   return false;
   *  > }
             *
             *  See <SASL mechanisms> for a list of available mechanisms.
             *
             *  Parameters:
             *    (Strophe.Connection) connection - Target Connection.
             *
             *  Returns:
             *    (Boolean) If mechanism was able to run.
             */
            /* jshint unused:false */
      test: function (connection) {
        return true
      },
            /* jshint unused:true */

            /** PrivateFunction: onStart
             *  Called before starting mechanism on some connection.
             *
             *  Parameters:
             *    (Strophe.Connection) connection - Target Connection.
             */
      onStart: function (connection) {
        this._connection = connection
      },

            /** PrivateFunction: onChallenge
             *  Called by protocol implementation on incoming challenge. If client is
             *  first (isClientFirst == true) challenge will be null on the first call.
             *
             *  Parameters:
             *    (Strophe.Connection) connection - Target Connection.
             *    (String) challenge - current challenge to handle.
             *
             *  Returns:
             *    (String) Mechanism response.
             */
            /* jshint unused:false */
      onChallenge: function (connection, challenge) {
        throw new Error('You should implement challenge handling!')
      },
            /* jshint unused:true */

            /** PrivateFunction: onFailure
             *  Protocol informs mechanism implementation about SASL failure.
             */
      onFailure: function () {
        this._connection = null
      },

            /** PrivateFunction: onSuccess
             *  Protocol informs mechanism implementation about SASL success.
             */
      onSuccess: function () {
        this._connection = null
      }
    }

        /** Constants: SASL mechanisms
         *  Available authentication mechanisms
         *
         *  Strophe.SASLAnonymous - SASL ANONYMOUS authentication.
         *  Strophe.SASLPlain - SASL PLAIN authentication.
         *  Strophe.SASLMD5 - SASL DIGEST-MD5 authentication
         *  Strophe.SASLSHA1 - SASL SCRAM-SHA1 authentication
         *  Strophe.SASLOAuthBearer - SASL OAuth Bearer authentication
         *  Strophe.SASLExternal - SASL EXTERNAL authentication
         */

// Building SASL callbacks

        /** PrivateConstructor: SASLAnonymous
         *  SASL ANONYMOUS authentication.
         */
    Strophe.SASLAnonymous = function () {
    }

    Strophe.SASLAnonymous.prototype = new Strophe.SASLMechanism('ANONYMOUS', false, 10)

    Strophe.SASLAnonymous.prototype.test = function (connection) {
      return connection.authcid === null
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLAnonymous.prototype.name] = Strophe.SASLAnonymous

        /** PrivateConstructor: SASLPlain
         *  SASL PLAIN authentication.
         */
    Strophe.SASLPlain = function () {
    }

    Strophe.SASLPlain.prototype = new Strophe.SASLMechanism('PLAIN', true, 20)

    Strophe.SASLPlain.prototype.test = function (connection) {
      return connection.authcid !== null
    }

    Strophe.SASLPlain.prototype.onChallenge = function (connection) {
      var auth_str = connection.authzid
      auth_str = auth_str + '\u0000'
      auth_str = auth_str + connection.authcid
      auth_str = auth_str + '\u0000'
      auth_str = auth_str + connection.pass
      return utils.utf16to8(auth_str)
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLPlain.prototype.name] = Strophe.SASLPlain

        /** PrivateConstructor: SASLSHA1
         *  SASL SCRAM SHA 1 authentication.
         */
    Strophe.SASLSHA1 = function () {
    }

    Strophe.SASLSHA1.prototype = new Strophe.SASLMechanism('SCRAM-SHA-1', true, 40)

    Strophe.SASLSHA1.prototype.test = function (connection) {
      return connection.authcid !== null
    }

    Strophe.SASLSHA1.prototype.onChallenge = function (connection, challenge, test_cnonce) {
      var cnonce = test_cnonce || MD5.hexdigest(Math.random() * 1234567890)
      var auth_str = 'n=' + utils.utf16to8(connection.authcid)
      auth_str += ',r='
      auth_str += cnonce

      connection._sasl_data.cnonce = cnonce
      connection._sasl_data['client-first-message-bare'] = auth_str

      auth_str = 'n,,' + auth_str

      this.onChallenge = function (connection, challenge) {
        var nonce, salt, iter, Hi, U, U_old, i, k, pass
        var clientKey, serverKey, clientSignature
        var responseText = 'c=biws,'
        var authMessage = connection._sasl_data['client-first-message-bare'] + ',' +
                    challenge + ','
        var cnonce = connection._sasl_data.cnonce
        var attribMatch = /([a-z]+)=([^,]+)(,|$)/

        while (challenge.match(attribMatch)) {
          var matches = challenge.match(attribMatch)
          challenge = challenge.replace(matches[0], '')
          switch (matches[1]) {
            case 'r':
              nonce = matches[2]
              break
            case 's':
              salt = matches[2]
              break
            case 'i':
              iter = matches[2]
              break
          }
        }

        if (nonce.substr(0, cnonce.length) !== cnonce) {
          connection._sasl_data = {}
          return connection._sasl_failure_cb()
        }

        responseText += 'r=' + nonce
        authMessage += responseText

        salt = Base64.decode(salt)
        salt += '\x00\x00\x00\x01'

        pass = utils.utf16to8(connection.pass)
        Hi = U_old = SHA1.core_hmac_sha1(pass, salt)
        for (i = 1; i < iter; i++) {
          U = SHA1.core_hmac_sha1(pass, SHA1.binb2str(U_old))
          for (k = 0; k < 5; k++) {
            Hi[k] ^= U[k]
          }
          U_old = U
        }
        Hi = SHA1.binb2str(Hi)

        clientKey = SHA1.core_hmac_sha1(Hi, 'Client Key')
        serverKey = SHA1.str_hmac_sha1(Hi, 'Server Key')
        clientSignature = SHA1.core_hmac_sha1(SHA1.str_sha1(SHA1.binb2str(clientKey)), authMessage)
        connection._sasl_data['server-signature'] = SHA1.b64_hmac_sha1(serverKey, authMessage)

        for (k = 0; k < 5; k++) {
          clientKey[k] ^= clientSignature[k]
        }

        responseText += ',p=' + Base64.encode(SHA1.binb2str(clientKey))
        return responseText
      }

      return auth_str
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLSHA1.prototype.name] = Strophe.SASLSHA1

        /** PrivateConstructor: SASLMD5
         *  SASL DIGEST MD5 authentication.
         */
    Strophe.SASLMD5 = function () {
    }

    Strophe.SASLMD5.prototype = new Strophe.SASLMechanism('DIGEST-MD5', false, 30)

    Strophe.SASLMD5.prototype.test = function (connection) {
      return connection.authcid !== null
    }

        /** PrivateFunction: _quote
         *  _Private_ utility function to backslash escape and quote strings.
         *
         *  Parameters:
         *    (String) str - The string to be quoted.
         *
         *  Returns:
         *    quoted string
         */
    Strophe.SASLMD5.prototype._quote = function (str) {
      return '"' + str.replace(/\\/g, '\\\\').replace(/"/g, '\\"') + '"'
            // " end string workaround for emacs
    }

    Strophe.SASLMD5.prototype.onChallenge = function (connection, challenge, test_cnonce) {
      var attribMatch = /([a-z]+)=("[^"]+"|[^,"]+)(?:,|$)/
      var cnonce = test_cnonce || MD5.hexdigest('' + (Math.random() * 1234567890))
      var realm = ''
      var host = null
      var nonce = ''
      var qop = ''
      var matches

      while (challenge.match(attribMatch)) {
        matches = challenge.match(attribMatch)
        challenge = challenge.replace(matches[0], '')
        matches[2] = matches[2].replace(/^"(.+)"$/, '$1')
        switch (matches[1]) {
          case 'realm':
            realm = matches[2]
            break
          case 'nonce':
            nonce = matches[2]
            break
          case 'qop':
            qop = matches[2]
            break
          case 'host':
            host = matches[2]
            break
        }
      }

      var digest_uri = connection.servtype + '/' + connection.domain
      if (host !== null) {
        digest_uri = digest_uri + '/' + host
      }

      var cred = utils.utf16to8(connection.authcid + ':' + realm + ':' + this._connection.pass)
      var A1 = MD5.hash(cred) + ':' + nonce + ':' + cnonce
      var A2 = 'AUTHENTICATE:' + digest_uri

      var responseText = ''
      responseText += 'charset=utf-8,'
      responseText += 'username=' + this._quote(utils.utf16to8(connection.authcid)) + ','
      responseText += 'realm=' + this._quote(realm) + ','
      responseText += 'nonce=' + this._quote(nonce) + ','
      responseText += 'nc=00000001,'
      responseText += 'cnonce=' + this._quote(cnonce) + ','
      responseText += 'digest-uri=' + this._quote(digest_uri) + ','
      responseText += 'response=' + MD5.hexdigest(MD5.hexdigest(A1) + ':' +
                    nonce + ':00000001:' +
                    cnonce + ':auth:' +
                    MD5.hexdigest(A2)) + ','
      responseText += 'qop=auth'

      this.onChallenge = function () {
        return ''
      }

      return responseText
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLMD5.prototype.name] = Strophe.SASLMD5

        /** PrivateConstructor: SASLOAuthBearer
         *  SASL OAuth Bearer authentication.
         */
    Strophe.SASLOAuthBearer = function () {
    }

    Strophe.SASLOAuthBearer.prototype = new Strophe.SASLMechanism('OAUTHBEARER', true, 50)

    Strophe.SASLOAuthBearer.prototype.test = function (connection) {
      return connection.authcid !== null
    }

    Strophe.SASLOAuthBearer.prototype.onChallenge = function (connection) {
      var auth_str = 'n,a='
      auth_str = auth_str + connection.authzid
      auth_str = auth_str + ','
      auth_str = auth_str + '\u0001'
      auth_str = auth_str + 'auth=Bearer '
      auth_str = auth_str + connection.pass
      auth_str = auth_str + '\u0001'
      auth_str = auth_str + '\u0001'
      return utils.utf16to8(auth_str)
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLOAuthBearer.prototype.name] = Strophe.SASLOAuthBearer

        /** PrivateConstructor: SASLExternal
         *  SASL EXTERNAL authentication.
         *
         *  The EXTERNAL mechanism allows a client to request the server to use
         *  credentials established by means external to the mechanism to
         *  authenticate the client. The external means may be, for instance,
         *  TLS services.
         */
    Strophe.SASLExternal = function () {
    }
    Strophe.SASLExternal.prototype = new Strophe.SASLMechanism('EXTERNAL', true, 60)

    Strophe.SASLExternal.prototype.onChallenge = function (connection) {
            /** According to XEP-178, an authzid SHOULD NOT be presented when the
             * authcid contained or implied in the client certificate is the JID (i.e.
             * authzid) with which the user wants to log in as.
             *
             * To NOT send the authzid, the user should therefore set the authcid equal
             * to the JID when instantiating a new Strophe.Connection object.
             */
      return connection.authcid === connection.authzid ? '' : connection.authzid
    }

    Strophe.Connection.prototype.mechanisms[Strophe.SASLExternal.prototype.name] = Strophe.SASLExternal

    return {
      Strophe: Strophe,
      $build: $build,
      $msg: $msg,
      $iq: $iq,
      $pres: $pres,
      SHA1: SHA1,
      Base64: Base64,
      MD5: MD5
    }
  }));

    /*
     This program is distributed under the terms of the MIT license.
     Please see the LICENSE file for details.

     Copyright 2006-2008, OGG, LLC
     */

    /* jshint undef: true, unused: true:, noarg: true, latedef: true */
    /* global define, window, setTimeout, clearTimeout, XMLHttpRequest, ActiveXObject, Strophe, $build */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-bosh', ['strophe-core'], function (core) {
        return factory(
                    core.Strophe,
                    core.$build
                )
      })
    } else {
            // Browser globals
      return factory(Strophe, $build)
    }
  }(this, function (Strophe, $build) {
        /** PrivateClass: Strophe.Request
         *  _Private_ helper class that provides a cross implementation abstraction
         *  for a BOSH related XMLHttpRequest.
         *
         *  The Strophe.Request class is used internally to encapsulate BOSH request
         *  information.  It is not meant to be used from user's code.
         */

        /** PrivateConstructor: Strophe.Request
         *  Create and initialize a new Strophe.Request object.
         *
         *  Parameters:
         *    (XMLElement) elem - The XML data to be sent in the request.
         *    (Function) func - The function that will be called when the
         *      XMLHttpRequest readyState changes.
         *    (Integer) rid - The BOSH rid attribute associated with this request.
         *    (Integer) sends - The number of times this same request has been
         *      sent.
         */
    Strophe.Request = function (elem, func, rid, sends) {
      this.id = ++Strophe._requestId
      this.xmlData = elem
      this.data = Strophe.serialize(elem)
            // save original function in case we need to make a new request
            // from this one.
      this.origFunc = func
      this.func = func
      this.rid = rid
      this.date = NaN
      this.sends = sends || 0
      this.abort = false
      this.dead = null

      this.age = function () {
        if (!this.date) {
          return 0
        }
        var now = new Date()
        return (now - this.date) / 1000
      }
      this.timeDead = function () {
        if (!this.dead) {
          return 0
        }
        var now = new Date()
        return (now - this.dead) / 1000
      }
      this.xhr = this._newXHR()
    }

    Strophe.Request.prototype = {
            /** PrivateFunction: getResponse
             *  Get a response from the underlying XMLHttpRequest.
             *
             *  This function attempts to get a response from the request and checks
             *  for errors.
             *
             *  Throws:
             *    "parsererror" - A parser error occured.
             *    "badformat" - The entity has sent XML that cannot be processed.
             *
             *  Returns:
             *    The DOM element tree of the response.
             */
      getResponse: function () {
        var node = null
        if (this.xhr.responseXML && this.xhr.responseXML.documentElement) {
          node = this.xhr.responseXML.documentElement
          if (node.tagName == 'parsererror') {
            Strophe.error('invalid response received')
            Strophe.error('responseText: ' + this.xhr.responseText)
            Strophe.error('responseXML: ' +
                            Strophe.serialize(this.xhr.responseXML))
            throw 'parsererror'
          }
        } else if (this.xhr.responseText) {
          Strophe.error('invalid response received')
          Strophe.error('responseText: ' + this.xhr.responseText)
          throw 'badformat'
        }

        return node
      },

            /** PrivateFunction: _newXHR
             *  _Private_ helper function to create XMLHttpRequests.
             *
             *  This function creates XMLHttpRequests across all implementations.
             *
             *  Returns:
             *    A new XMLHttpRequest.
             */
      _newXHR: function () {
        var xhr = null
        if (window.XMLHttpRequest) {
          xhr = new XMLHttpRequest()
          if (xhr.overrideMimeType) {
            xhr.overrideMimeType('text/xml; charset=utf-8')
          }
        } else if (window.ActiveXObject) {
          xhr = new ActiveXObject('Microsoft.XMLHTTP')
        }
                // use Function.bind() to prepend ourselves as an argument
        xhr.onreadystatechange = this.func.bind(null, this)
        return xhr
      }
    }

        /** Class: Strophe.Bosh
         *  _Private_ helper class that handles BOSH Connections
         *
         *  The Strophe.Bosh class is used internally by Strophe.Connection
         *  to encapsulate BOSH sessions. It is not meant to be used from user's code.
         */

        /** File: bosh.js
         *  A JavaScript library to enable BOSH in Strophejs.
         *
         *  this library uses Bidirectional-streams Over Synchronous HTTP (BOSH)
         *  to emulate a persistent, stateful, two-way connection to an XMPP server.
         *  More information on BOSH can be found in XEP 124.
         */

        /** PrivateConstructor: Strophe.Bosh
         *  Create and initialize a Strophe.Bosh object.
         *
         *  Parameters:
         *    (Strophe.Connection) connection - The Strophe.Connection that will use BOSH.
         *
         *  Returns:
         *    A new Strophe.Bosh object.
         */
    Strophe.Bosh = function (connection) {
      this._conn = connection
            /* request id for body tags */
      this.rid = Math.floor(Math.random() * 4294967295)
            /* The current session ID. */
      this.sid = null

            // default BOSH values
      this.hold = 1
      this.wait = 60
      this.window = 5
      this.errors = 0

      this._requests = []
    }

    Strophe.Bosh.prototype = {
            /** Variable: strip
             *
             *  BOSH-Connections will have all stanzas wrapped in a <body> tag when
             *  passed to <Strophe.Connection.xmlInput> or <Strophe.Connection.xmlOutput>.
             *  To strip this tag, User code can set <Strophe.Bosh.strip> to "body":
             *
             *  > Strophe.Bosh.prototype.strip = "body";
             *
             *  This will enable stripping of the body tag in both
             *  <Strophe.Connection.xmlInput> and <Strophe.Connection.xmlOutput>.
             */
      strip: null,

            /** PrivateFunction: _buildBody
             *  _Private_ helper function to generate the <body/> wrapper for BOSH.
             *
             *  Returns:
             *    A Strophe.Builder with a <body/> element.
             */
      _buildBody: function () {
        var bodyWrap = $build('body', {
          rid: this.rid++,
          xmlns: Strophe.NS.HTTPBIND
        })
        if (this.sid !== null) {
          bodyWrap.attrs({sid: this.sid})
        }
        if (this._conn.options.keepalive && this._conn._sessionCachingSupported()) {
          this._cacheSession()
        }
        return bodyWrap
      },

            /** PrivateFunction: _reset
             *  Reset the connection.
             *
             *  This function is called by the reset function of the Strophe Connection
             */
      _reset: function () {
        this.rid = Math.floor(Math.random() * 4294967295)
        this.sid = null
        this.errors = 0
        if (this._conn._sessionCachingSupported()) {
          window.sessionStorage.removeItem('strophe-bosh-session')
        }

        this._conn.nextValidRid(this.rid)
      },

            /** PrivateFunction: _connect
             *  _Private_ function that initializes the BOSH connection.
             *
             *  Creates and sends the Request that initializes the BOSH connection.
             */
      _connect: function (wait, hold, route) {
        this.wait = wait || this.wait
        this.hold = hold || this.hold
        this.errors = 0

                // build the body tag
        var body = this._buildBody().attrs({
          to: this._conn.domain,
          'xml:lang': 'en',
          wait: this.wait,
          hold: this.hold,
          content: 'text/xml; charset=utf-8',
          ver: '1.6',
          'xmpp:version': '1.0',
          'xmlns:xmpp': Strophe.NS.BOSH
        })

        if (route) {
          body.attrs({
            route: route
          })
        }

        var _connect_cb = this._conn._connect_cb

        this._requests.push(
                    new Strophe.Request(body.tree(),
                        this._onRequestStateChange.bind(
                            this, _connect_cb.bind(this._conn)),
                        body.tree().getAttribute('rid')))
        this._throttledRequestHandler()
      },

            /** PrivateFunction: _attach
             *  Attach to an already created and authenticated BOSH session.
             *
             *  This function is provided to allow Strophe to attach to BOSH
             *  sessions which have been created externally, perhaps by a Web
             *  application.  This is often used to support auto-login type features
             *  without putting user credentials into the page.
             *
             *  Parameters:
             *    (String) jid - The full JID that is bound by the session.
             *    (String) sid - The SID of the BOSH session.
             *    (String) rid - The current RID of the BOSH session.  This RID
             *      will be used by the next request.
             *    (Function) callback The connect callback function.
             *    (Integer) wait - The optional HTTPBIND wait value.  This is the
             *      time the server will wait before returning an empty result for
             *      a request.  The default setting of 60 seconds is recommended.
             *      Other settings will require tweaks to the Strophe.TIMEOUT value.
             *    (Integer) hold - The optional HTTPBIND hold value.  This is the
             *      number of connections the server will hold at one time.  This
             *      should almost always be set to 1 (the default).
             *    (Integer) wind - The optional HTTBIND window value.  This is the
             *      allowed range of request ids that are valid.  The default is 5.
             */
      _attach: function (jid, sid, rid, callback, wait, hold, wind) {
        this._conn.jid = jid
        this.sid = sid
        this.rid = rid

        this._conn.connect_callback = callback

        this._conn.domain = Strophe.getDomainFromJid(this._conn.jid)

        this._conn.authenticated = true
        this._conn.connected = true

        this.wait = wait || this.wait
        this.hold = hold || this.hold
        this.window = wind || this.window

        this._conn._changeConnectStatus(Strophe.Status.ATTACHED, null)
      },

            /** PrivateFunction: _restore
             *  Attempt to restore a cached BOSH session
             *
             *  Parameters:
             *    (String) jid - The full JID that is bound by the session.
             *      This parameter is optional but recommended, specifically in cases
             *      where prebinded BOSH sessions are used where it's important to know
             *      that the right session is being restored.
             *    (Function) callback The connect callback function.
             *    (Integer) wait - The optional HTTPBIND wait value.  This is the
             *      time the server will wait before returning an empty result for
             *      a request.  The default setting of 60 seconds is recommended.
             *      Other settings will require tweaks to the Strophe.TIMEOUT value.
             *    (Integer) hold - The optional HTTPBIND hold value.  This is the
             *      number of connections the server will hold at one time.  This
             *      should almost always be set to 1 (the default).
             *    (Integer) wind - The optional HTTBIND window value.  This is the
             *      allowed range of request ids that are valid.  The default is 5.
             */
      _restore: function (jid, callback, wait, hold, wind) {
        var session = JSON.parse(window.sessionStorage.getItem('strophe-bosh-session'))
        if (typeof session !== 'undefined' &&
                    session !== null &&
                    session.rid &&
                    session.sid &&
                    session.jid &&
                    (typeof jid === 'undefined' || jid === null || Strophe.getBareJidFromJid(session.jid) == Strophe.getBareJidFromJid(jid))) {
          this._conn.restored = true
          this._attach(session.jid, session.sid, session.rid, callback, wait, hold, wind)
        } else {
          throw {name: 'StropheSessionError', message: '_restore: no restoreable session.'}
        }
      },

            /** PrivateFunction: _cacheSession
             *  _Private_ handler for the beforeunload event.
             *
             *  This handler is used to process the Bosh-part of the initial request.
             *  Parameters:
             *    (Strophe.Request) bodyWrap - The received stanza.
             */
      _cacheSession: function () {
        if (this._conn.authenticated) {
          if (this._conn.jid && this.rid && this.sid) {
            window.sessionStorage.setItem('strophe-bosh-session', JSON.stringify({
              'jid': this._conn.jid,
              'rid': this.rid,
              'sid': this.sid
            }))
          }
        } else {
          window.sessionStorage.removeItem('strophe-bosh-session')
        }
      },

            /** PrivateFunction: _connect_cb
             *  _Private_ handler for initial connection request.
             *
             *  This handler is used to process the Bosh-part of the initial request.
             *  Parameters:
             *    (Strophe.Request) bodyWrap - The received stanza.
             */
      _connect_cb: function (bodyWrap) {
        var typ = bodyWrap.getAttribute('type')
        var cond, conflict
        if (typ !== null && typ == 'terminate') {
                    // an error occurred
          cond = bodyWrap.getAttribute('condition')
          Strophe.error('BOSH-Connection failed: ' + cond)
          conflict = bodyWrap.getElementsByTagName('conflict')
          if (cond !== null) {
            if (cond == 'remote-stream-error' && conflict.length > 0) {
              cond = 'conflict'
            }
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, cond)
          } else {
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, 'unknown')
          }
          this._conn._doDisconnect(cond)
          return Strophe.Status.CONNFAIL
        }

                // check to make sure we don't overwrite these if _connect_cb is
                // called multiple times in the case of missing stream:features
        if (!this.sid) {
          this.sid = bodyWrap.getAttribute('sid')
        }
        var wind = bodyWrap.getAttribute('requests')
        if (wind) {
          this.window = parseInt(wind, 10)
        }
        var hold = bodyWrap.getAttribute('hold')
        if (hold) {
          this.hold = parseInt(hold, 10)
        }
        var wait = bodyWrap.getAttribute('wait')
        if (wait) {
          this.wait = parseInt(wait, 10)
        }
      },

            /** PrivateFunction: _disconnect
             *  _Private_ part of Connection.disconnect for Bosh
             *
             *  Parameters:
             *    (Request) pres - This stanza will be sent before disconnecting.
             */
      _disconnect: function (pres) {
        this._sendTerminate(pres)
      },

            /** PrivateFunction: _doDisconnect
             *  _Private_ function to disconnect.
             *
             *  Resets the SID and RID.
             */
      _doDisconnect: function () {
        this.sid = null
        this.rid = Math.floor(Math.random() * 4294967295)
        if (this._conn._sessionCachingSupported()) {
          window.sessionStorage.removeItem('strophe-bosh-session')
        }

        this._conn.nextValidRid(this.rid)
      },

            /** PrivateFunction: _emptyQueue
             * _Private_ function to check if the Request queue is empty.
             *
             *  Returns:
             *    True, if there are no Requests queued, False otherwise.
             */
      _emptyQueue: function () {
        return this._requests.length === 0
      },

            /** PrivateFunction: _hitError
             *  _Private_ function to handle the error count.
             *
             *  Requests are resent automatically until their error count reaches
             *  5.  Each time an error is encountered, this function is called to
             *  increment the count and disconnect if the count is too high.
             *
             *  Parameters:
             *    (Integer) reqStatus - The request status.
             */
      _hitError: function (reqStatus) {
        this.errors++
        Strophe.warn('request errored, status: ' + reqStatus +
                    ', number of errors: ' + this.errors)
        if (this.errors > 4) {
          this._conn._onDisconnectTimeout()
        }
      },

            /** PrivateFunction: _no_auth_received
             *
             * Called on stream start/restart when no stream:features
             * has been received and sends a blank poll request.
             */
      _no_auth_received: function (_callback) {
        if (_callback) {
          _callback = _callback.bind(this._conn)
        } else {
          _callback = this._conn._connect_cb.bind(this._conn)
        }
        var body = this._buildBody()
        this._requests.push(
                    new Strophe.Request(body.tree(),
                        this._onRequestStateChange.bind(
                            this, _callback.bind(this._conn)),
                        body.tree().getAttribute('rid')))
        this._throttledRequestHandler()
      },

            /** PrivateFunction: _onDisconnectTimeout
             *  _Private_ timeout handler for handling non-graceful disconnection.
             *
             *  Cancels all remaining Requests and clears the queue.
             */
      _onDisconnectTimeout: function () {
        this._abortAllRequests()
      },

            /** PrivateFunction: _abortAllRequests
             *  _Private_ helper function that makes sure all pending requests are aborted.
             */
      _abortAllRequests: function _abortAllRequests () {
        var req
        while (this._requests.length > 0) {
          req = this._requests.pop()
          req.abort = true
          req.xhr.abort()
                    // jslint complains, but this is fine. setting to empty func
                    // is necessary for IE6
          req.xhr.onreadystatechange = function () {
          } // jshint ignore:line
        }
      },

            /** PrivateFunction: _onIdle
             *  _Private_ handler called by Strophe.Connection._onIdle
             *
             *  Sends all queued Requests or polls with empty Request if there are none.
             */
      _onIdle: function () {
        var data = this._conn._data

                // if no requests are in progress, poll
        if (this._conn.authenticated && this._requests.length === 0 &&
                    data.length === 0 && !this._conn.disconnecting) {
          Strophe.info('no requests during idle cycle, sending ' +
                        'blank request')
          data.push(null)
        }

        if (this._conn.paused) {
          return
        }

        if (this._requests.length < 2 && data.length > 0) {
          var body = this._buildBody()
          for (var i = 0; i < data.length; i++) {
            if (data[i] !== null) {
              if (data[i] === 'restart') {
                body.attrs({
                  to: this._conn.domain,
                  'xml:lang': 'en',
                  'xmpp:restart': 'true',
                  'xmlns:xmpp': Strophe.NS.BOSH
                })
              } else {
                body.cnode(data[i]).up()
              }
            }
          }
          delete this._conn._data
          this._conn._data = []
          this._requests.push(
                        new Strophe.Request(body.tree(),
                            this._onRequestStateChange.bind(
                                this, this._conn._dataRecv.bind(this._conn)),
                            body.tree().getAttribute('rid')))
          this._throttledRequestHandler()
        }

        if (this._requests.length > 0) {
          var time_elapsed = this._requests[0].age()
          if (this._requests[0].dead !== null) {
            if (this._requests[0].timeDead() >
                            Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait)) {
              this._throttledRequestHandler()
            }
          }

          if (time_elapsed > Math.floor(Strophe.TIMEOUT * this.wait)) {
            Strophe.warn('Request ' +
                            this._requests[0].id +
                            ' timed out, over ' + Math.floor(Strophe.TIMEOUT * this.wait) +
                            ' seconds since last activity')
            this._throttledRequestHandler()
          }
        }
      },

            /** PrivateFunction: _onRequestStateChange
             *  _Private_ handler for Strophe.Request state changes.
             *
             *  This function is called when the XMLHttpRequest readyState changes.
             *  It contains a lot of error handling logic for the many ways that
             *  requests can fail, and calls the request callback when requests
             *  succeed.
             *
             *  Parameters:
             *    (Function) func - The handler for the request.
             *    (Strophe.Request) req - The request that is changing readyState.
             */
      _onRequestStateChange: function (func, req) {
        Strophe.debug('request id ' + req.id +
                    '.' + req.sends + ' state changed to ' +
                    req.xhr.readyState)

        if (req.abort) {
          req.abort = false
          return
        }

                // request complete
        var reqStatus
        if (req.xhr.readyState == 4) {
          reqStatus = 0
          try {
            reqStatus = req.xhr.status
          } catch (e) {
                        // ignore errors from undefined status attribute.  works
                        // around a browser bug
          }

          if (typeof (reqStatus) == 'undefined') {
            reqStatus = 0
          }

          if (this.disconnecting) {
            if (reqStatus >= 400) {
              this._hitError(reqStatus)
              return
            }
          }

          var reqIs0 = (this._requests[0] == req)
          var reqIs1 = (this._requests[1] == req)

          if ((reqStatus > 0 && reqStatus < 500) || req.sends > 5) {
                        // remove from internal queue
            this._removeRequest(req)
            Strophe.debug('request id ' +
                            req.id +
                            ' should now be removed')
          }

                    // request succeeded
          if (reqStatus == 200) {
                        // if request 1 finished, or request 0 finished and request
                        // 1 is over Strophe.SECONDARY_TIMEOUT seconds old, we need to
                        // restart the other - both will be in the first spot, as the
                        // completed request has been removed from the queue already
            if (reqIs1 ||
                            (reqIs0 && this._requests.length > 0 &&
                            this._requests[0].age() > Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait))) {
              this._restartRequest(0)
            }

            this._conn.nextValidRid(Number(req.rid) + 1)

                        // call handler
            Strophe.debug('request id ' +
                            req.id + '.' +
                            req.sends + ' got 200')
            func(req)
            this.errors = 0
          } else {
            Strophe.error('request id ' +
                            req.id + '.' +
                            req.sends + ' error ' + reqStatus +
                            ' happened')
            if (reqStatus === 0 ||
                            (reqStatus >= 400 && reqStatus < 600) ||
                            reqStatus >= 12000) {
              this._hitError(reqStatus)
              if (reqStatus >= 400 && reqStatus < 500) {
                this._conn._changeConnectStatus(Strophe.Status.DISCONNECTING, null)
                this._conn._doDisconnect()
              }
            }
          }

          if (!((reqStatus > 0 && reqStatus < 500) ||
                        req.sends > 5)) {
            this._throttledRequestHandler()
          }
        }
      },

            /** PrivateFunction: _processRequest
             *  _Private_ function to process a request in the queue.
             *
             *  This function takes requests off the queue and sends them and
             *  restarts dead requests.
             *
             *  Parameters:
             *    (Integer) i - The index of the request in the queue.
             */
      _processRequest: function (i) {
        var self = this
        var req = this._requests[i]
        var reqStatus = -1

        try {
          if (req.xhr.readyState == 4) {
            reqStatus = req.xhr.status
          }
        } catch (e) {
          Strophe.error('caught an error in _requests[' + i +
                        '], reqStatus: ' + reqStatus)
        }

        if (typeof (reqStatus) == 'undefined') {
          reqStatus = -1
        }

                // make sure we limit the number of retries
        if (req.sends > this._conn.maxRetries) {
          this._conn._onDisconnectTimeout()
          return
        }

        var time_elapsed = req.age()
        var primaryTimeout = (!isNaN(time_elapsed) &&
                time_elapsed > Math.floor(Strophe.TIMEOUT * this.wait))
        var secondaryTimeout = (req.dead !== null &&
                req.timeDead() > Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait))
        var requestCompletedWithServerError = (req.xhr.readyState == 4 &&
                (reqStatus < 1 ||
                reqStatus >= 500))
        if (primaryTimeout || secondaryTimeout ||
                    requestCompletedWithServerError) {
          if (secondaryTimeout) {
            Strophe.error('Request ' +
                            this._requests[i].id +
                            ' timed out (secondary), restarting')
          }
          req.abort = true
          req.xhr.abort()
                    // setting to null fails on IE6, so set to empty function
          req.xhr.onreadystatechange = function () {
          }
          this._requests[i] = new Strophe.Request(req.xmlData,
                        req.origFunc,
                        req.rid,
                        req.sends)
          req = this._requests[i]
        }

        if (req.xhr.readyState === 0) {
          Strophe.debug('request id ' + req.id +
                        '.' + req.sends + ' posting')

          try {
            var contentType = this._conn.options.contentType || 'text/xml; charset=utf-8'
            req.xhr.open('POST', this._conn.service, this._conn.options.sync ? false : true)
            req.xhr.setRequestHeader && req.xhr.setRequestHeader('Content-Type', contentType)
            if (this._conn.options.withCredentials) {
              req.xhr.withCredentials = true
            }
          } catch (e2) {
            Strophe.error('XHR open failed.')
            if (!this._conn.connected) {
              this._conn._changeConnectStatus(Strophe.Status.CONNFAIL,
                                'bad-service')
            }
            this._conn.disconnect()
            return
          }

                    // Fires the XHR request -- may be invoked immediately
                    // or on a gradually expanding retry window for reconnects
          var sendFunc = function () {
            req.date = new Date()
            if (self._conn.options.customHeaders) {
              var headers = self._conn.options.customHeaders
              for (var header in headers) {
                if (headers.hasOwnProperty(header)) {
                  req.xhr.setRequestHeader(header, headers[header])
                }
              }
            }
            req.xhr.send(req.data)
          }

                    // Implement progressive backoff for reconnects --
                    // First retry (send == 1) should also be instantaneous
          if (req.sends > 1) {
                        // Using a cube of the retry number creates a nicely
                        // expanding retry window
            var backoff = Math.min(Math.floor(Strophe.TIMEOUT * this.wait),
                                Math.pow(req.sends, 3)) * 1000

                        // XXX: setTimeout should be called only with function expressions (23974bc1)
            setTimeout(function () {
              sendFunc()
            }, backoff)
          } else {
            sendFunc()
          }

          req.sends++

          if (this._conn.xmlOutput !== Strophe.Connection.prototype.xmlOutput) {
            if (req.xmlData.nodeName === this.strip && req.xmlData.childNodes.length) {
              this._conn.xmlOutput(req.xmlData.childNodes[0])
            } else {
              this._conn.xmlOutput(req.xmlData)
            }
          }
          if (this._conn.rawOutput !== Strophe.Connection.prototype.rawOutput) {
            this._conn.rawOutput(req.data)
          }
        } else {
          Strophe.debug('_processRequest: ' +
                        (i === 0 ? 'first' : 'second') +
                        ' request has readyState of ' +
                        req.xhr.readyState)
        }
      },

            /** PrivateFunction: _removeRequest
             *  _Private_ function to remove a request from the queue.
             *
             *  Parameters:
             *    (Strophe.Request) req - The request to remove.
             */
      _removeRequest: function (req) {
        Strophe.debug('removing request')

        var i
        for (i = this._requests.length - 1; i >= 0; i--) {
          if (req == this._requests[i]) {
            this._requests.splice(i, 1)
          }
        }

                // IE6 fails on setting to null, so set to empty function
        req.xhr.onreadystatechange = function () {
        }

        this._throttledRequestHandler()
      },

            /** PrivateFunction: _restartRequest
             *  _Private_ function to restart a request that is presumed dead.
             *
             *  Parameters:
             *    (Integer) i - The index of the request in the queue.
             */
      _restartRequest: function (i) {
        var req = this._requests[i]
        if (req.dead === null) {
          req.dead = new Date()
        }

        this._processRequest(i)
      },

            /** PrivateFunction: _reqToData
             * _Private_ function to get a stanza out of a request.
             *
             * Tries to extract a stanza out of a Request Object.
             * When this fails the current connection will be disconnected.
             *
             *  Parameters:
             *    (Object) req - The Request.
             *
             *  Returns:
             *    The stanza that was passed.
             */
      _reqToData: function (req) {
        try {
          return req.getResponse()
        } catch (e) {
          if (e != 'parsererror') {
            throw e
          }
          this._conn.disconnect('strophe-parsererror')
        }
      },

            /** PrivateFunction: _sendTerminate
             *  _Private_ function to send initial disconnect sequence.
             *
             *  This is the first step in a graceful disconnect.  It sends
             *  the BOSH server a terminate body and includes an unavailable
             *  presence if authentication has completed.
             */
      _sendTerminate: function (pres) {
        Strophe.info('_sendTerminate was called')
        var body = this._buildBody().attrs({type: 'terminate'})

        if (pres) {
          body.cnode(pres.tree())
        }

        var req = new Strophe.Request(body.tree(),
                    this._onRequestStateChange.bind(
                        this, this._conn._dataRecv.bind(this._conn)),
                    body.tree().getAttribute('rid'))

        this._requests.push(req)
        this._throttledRequestHandler()
      },

            /** PrivateFunction: _send
             *  _Private_ part of the Connection.send function for BOSH
             *
             * Just triggers the RequestHandler to send the messages that are in the queue
             */
      _send: function () {
        clearTimeout(this._conn._idleTimeout)
        this._throttledRequestHandler()

                // XXX: setTimeout should be called only with function expressions (23974bc1)
        this._conn._idleTimeout = setTimeout(function () {
          this._onIdle()
        }.bind(this._conn), 100)
      },

            /** PrivateFunction: _sendRestart
             *
             *  Send an xmpp:restart stanza.
             */
      _sendRestart: function () {
        this._throttledRequestHandler()
        clearTimeout(this._conn._idleTimeout)
      },

            /** PrivateFunction: _throttledRequestHandler
             *  _Private_ function to throttle requests to the connection window.
             *
             *  This function makes sure we don't send requests so fast that the
             *  request ids overflow the connection window in the case that one
             *  request died.
             */
      _throttledRequestHandler: function () {
        if (!this._requests) {
          Strophe.debug('_throttledRequestHandler called with ' +
                        'undefined requests')
        } else {
          Strophe.debug('_throttledRequestHandler called with ' +
                        this._requests.length + ' requests')
        }

        if (!this._requests || this._requests.length === 0) {
          return
        }

        if (this._requests.length > 0) {
          this._processRequest(0)
        }

        if (this._requests.length > 1 &&
                    Math.abs(this._requests[0].rid -
                        this._requests[1].rid) < this.window) {
          this._processRequest(1)
        }
      }
    }
    return Strophe
  }));

    /*
     This program is distributed under the terms of the MIT license.
     Please see the LICENSE file for details.

     Copyright 2006-2008, OGG, LLC
     */

    /* jshint undef: true, unused: true:, noarg: true, latedef: true */
    /* global define, window, clearTimeout, WebSocket, DOMParser, Strophe, $build */

  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('strophe-websocket', ['strophe-core'], function (core) {
        return factory(
                    core.Strophe,
                    core.$build
                )
      })
    } else {
            // Browser globals
      return factory(Strophe, $build)
    }
  }(this, function (Strophe, $build) {
        /** Class: Strophe.WebSocket
         *  _Private_ helper class that handles WebSocket Connections
         *
         *  The Strophe.WebSocket class is used internally by Strophe.Connection
         *  to encapsulate WebSocket sessions. It is not meant to be used from user's code.
         */

        /** File: websocket.js
         *  A JavaScript library to enable XMPP over Websocket in Strophejs.
         *
         *  This file implements XMPP over WebSockets for Strophejs.
         *  If a Connection is established with a Websocket url (ws://...)
         *  Strophe will use WebSockets.
         *  For more information on XMPP-over-WebSocket see RFC 7395:
         *  http://tools.ietf.org/html/rfc7395
         *
         *  WebSocket support implemented by Andreas Guth (andreas.guth@rwth-aachen.de)
         */

        /** PrivateConstructor: Strophe.Websocket
         *  Create and initialize a Strophe.WebSocket object.
         *  Currently only sets the connection Object.
         *
         *  Parameters:
         *    (Strophe.Connection) connection - The Strophe.Connection that will use WebSockets.
         *
         *  Returns:
         *    A new Strophe.WebSocket object.
         */
    Strophe.Websocket = function (connection) {
      this._conn = connection
      this.strip = 'wrapper'

      var service = connection.service
      if (service.indexOf('ws:') !== 0 && service.indexOf('wss:') !== 0) {
                // If the service is not an absolute URL, assume it is a path and put the absolute
                // URL together from options, current URL and the path.
        var new_service = ''

        if (connection.options.protocol === 'ws' && window.location.protocol !== 'https:') {
          new_service += 'ws'
        } else {
          new_service += 'wss'
        }

        new_service += '://' + window.location.host

        if (service.indexOf('/') !== 0) {
          new_service += window.location.pathname + service
        } else {
          new_service += service
        }

        connection.service = new_service
      }
    }

    Strophe.Websocket.prototype = {
            /** PrivateFunction: _buildStream
             *  _Private_ helper function to generate the <stream> start tag for WebSockets
             *
             *  Returns:
             *    A Strophe.Builder with a <stream> element.
             */
      _buildStream: function () {
        return $build('open', {
          'xmlns': Strophe.NS.FRAMING,
          'to': this._conn.domain,
          'version': '1.0'
        })
      },

            /** PrivateFunction: _check_streamerror
             * _Private_ checks a message for stream:error
             *
             *  Parameters:
             *    (Strophe.Request) bodyWrap - The received stanza.
             *    connectstatus - The ConnectStatus that will be set on error.
             *  Returns:
             *     true if there was a streamerror, false otherwise.
             */
      _check_streamerror: function (bodyWrap, connectstatus) {
        var errors
        if (bodyWrap.getElementsByTagNameNS) {
          errors = bodyWrap.getElementsByTagNameNS(Strophe.NS.STREAM, 'error')
        } else {
          errors = bodyWrap.getElementsByTagName('stream:error')
        }
        if (errors.length === 0) {
          return false
        }
        var error = errors[0]

        var condition = ''
        var text = ''

        var ns = 'urn:ietf:params:xml:ns:xmpp-streams'
        for (var i = 0; i < error.childNodes.length; i++) {
          var e = error.childNodes[i]
          if (e.getAttribute('xmlns') !== ns) {
            break
          }
          if (e.nodeName === 'text') {
            text = e.textContent
          } else {
            condition = e.nodeName
          }
        }

        var errorString = 'WebSocket stream error: '

        if (condition) {
          errorString += condition
        } else {
          errorString += 'unknown'
        }

        if (text) {
          errorString += ' - ' + condition
        }

        Strophe.error(errorString)

                // close the connection on stream_error
        this._conn._changeConnectStatus(connectstatus, condition)
        this._conn._doDisconnect()
        return true
      },

            /** PrivateFunction: _reset
             *  Reset the connection.
             *
             *  This function is called by the reset function of the Strophe Connection.
             *  Is not needed by WebSockets.
             */
      _reset: function () {
        return
      },

            /** PrivateFunction: _connect
             *  _Private_ function called by Strophe.Connection.connect
             *
             *  Creates a WebSocket for a connection and assigns Callbacks to it.
             *  Does nothing if there already is a WebSocket.
             */
      _connect: function () {
                // Ensure that there is no open WebSocket from a previous Connection.
        this._closeSocket()

                // Create the new WobSocket
        this.socket = new WebSocket(this._conn.service, 'xmpp')
        this.socket.onopen = this._onOpen.bind(this)
        this.socket.onerror = this._onError.bind(this)
        this.socket.onclose = this._onClose.bind(this)
        this.socket.onmessage = this._connect_cb_wrapper.bind(this)
      },

            /** PrivateFunction: _connect_cb
             *  _Private_ function called by Strophe.Connection._connect_cb
             *
             * checks for stream:error
             *
             *  Parameters:
             *    (Strophe.Request) bodyWrap - The received stanza.
             */
      _connect_cb: function (bodyWrap) {
        var error = this._check_streamerror(bodyWrap, Strophe.Status.CONNFAIL)
        if (error) {
          return Strophe.Status.CONNFAIL
        }
      },

            /** PrivateFunction: _handleStreamStart
             * _Private_ function that checks the opening <open /> tag for errors.
             *
             * Disconnects if there is an error and returns false, true otherwise.
             *
             *  Parameters:
             *    (Node) message - Stanza containing the <open /> tag.
             */
      _handleStreamStart: function (message) {
        var error = false

                // Check for errors in the <open /> tag
        var ns = message.getAttribute('xmlns')
        if (typeof ns !== 'string') {
          error = 'Missing xmlns in <open />'
        } else if (ns !== Strophe.NS.FRAMING) {
          error = 'Wrong xmlns in <open />: ' + ns
        }

        var ver = message.getAttribute('version')
        if (typeof ver !== 'string') {
          error = 'Missing version in <open />'
        } else if (ver !== '1.0') {
          error = 'Wrong version in <open />: ' + ver
        }

        if (error) {
          this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, error)
          this._conn._doDisconnect()
          return false
        }

        return true
      },

            /** PrivateFunction: _connect_cb_wrapper
             * _Private_ function that handles the first connection messages.
             *
             * On receiving an opening stream tag this callback replaces itself with the real
             * message handler. On receiving a stream error the connection is terminated.
             */
      _connect_cb_wrapper: function (message) {
        if (message.data.indexOf('<open ') === 0 || message.data.indexOf('<?xml') === 0) {
                    // Strip the XML Declaration, if there is one
          var data = message.data.replace(/^(<\?.*?\?>\s*)*/, '')
          if (data === '') return

          var streamStart = new DOMParser().parseFromString(data, 'text/xml').documentElement
          this._conn.xmlInput(streamStart)
          this._conn.rawInput(message.data)

                    // _handleStreamSteart will check for XML errors and disconnect on error
          if (this._handleStreamStart(streamStart)) {
                        // _connect_cb will check for stream:error and disconnect on error
            this._connect_cb(streamStart)
          }
        } else if (message.data.indexOf('<close ') === 0) { // '<close xmlns="urn:ietf:params:xml:ns:xmpp-framing />') {
          this._conn.rawInput(message.data)
          this._conn.xmlInput(message)
          var see_uri = message.getAttribute('see-other-uri')
          if (see_uri) {
            this._conn._changeConnectStatus(Strophe.Status.REDIRECT, 'Received see-other-uri, resetting connection')
            this._conn.reset()
            this._conn.service = see_uri
            this._connect()
          } else {
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, 'Received closing stream')
            this._conn._doDisconnect()
          }
        } else {
          var string = this._streamWrap(message.data)
          var elem = new DOMParser().parseFromString(string, 'text/xml').documentElement
          this.socket.onmessage = this._onMessage.bind(this)
          this._conn._connect_cb(elem, null, message.data)
        }
      },

            /** PrivateFunction: _disconnect
             *  _Private_ function called by Strophe.Connection.disconnect
             *
             *  Disconnects and sends a last stanza if one is given
             *
             *  Parameters:
             *    (Request) pres - This stanza will be sent before disconnecting.
             */
      _disconnect: function (pres) {
        if (this.socket && this.socket.readyState !== WebSocket.CLOSED) {
          if (pres) {
            this._conn.send(pres)
          }
          var close = $build('close', {'xmlns': Strophe.NS.FRAMING})
          this._conn.xmlOutput(close)
          var closeString = Strophe.serialize(close)
          this._conn.rawOutput(closeString)
          try {
            this.socket.send(closeString)
          } catch (e) {
            Strophe.info("Couldn't send <close /> tag.")
          }
        }
        this._conn._doDisconnect()
      },

            /** PrivateFunction: _doDisconnect
             *  _Private_ function to disconnect.
             *
             *  Just closes the Socket for WebSockets
             */
      _doDisconnect: function () {
        Strophe.info('WebSockets _doDisconnect was called')
        this._closeSocket()
      },

            /** PrivateFunction _streamWrap
             *  _Private_ helper function to wrap a stanza in a <stream> tag.
             *  This is used so Strophe can process stanzas from WebSockets like BOSH
             */
      _streamWrap: function (stanza) {
        return '<wrapper>' + stanza + '</wrapper>'
      },

            /** PrivateFunction: _closeSocket
             *  _Private_ function to close the WebSocket.
             *
             *  Closes the socket if it is still open and deletes it
             */
      _closeSocket: function () {
        if (this.socket) {
          try {
            this.socket.close()
          } catch (e) {
          }
        }
        this.socket = null
      },

            /** PrivateFunction: _emptyQueue
             * _Private_ function to check if the message queue is empty.
             *
             *  Returns:
             *    True, because WebSocket messages are send immediately after queueing.
             */
      _emptyQueue: function () {
        return true
      },

            /** PrivateFunction: _onClose
             * _Private_ function to handle websockets closing.
             *
             * Nothing to do here for WebSockets
             */
      _onClose: function () {
        if (this._conn.connected && !this._conn.disconnecting) {
          Strophe.error('Websocket closed unexpectedly')
          this._conn._doDisconnect()
        } else {
          Strophe.info('Websocket closed')
        }
      },

            /** PrivateFunction: _no_auth_received
             *
             * Called on stream start/restart when no stream:features
             * has been received.
             */
      _no_auth_received: function (_callback) {
        Strophe.error('Server did not send any auth methods')
        this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, 'Server did not send any auth methods')
        if (_callback) {
          _callback = _callback.bind(this._conn)
          _callback()
        }
        this._conn._doDisconnect()
      },

            /** PrivateFunction: _onDisconnectTimeout
             *  _Private_ timeout handler for handling non-graceful disconnection.
             *
             *  This does nothing for WebSockets
             */
      _onDisconnectTimeout: function () {
      },

            /** PrivateFunction: _abortAllRequests
             *  _Private_ helper function that makes sure all pending requests are aborted.
             */
      _abortAllRequests: function () {
      },

            /** PrivateFunction: _onError
             * _Private_ function to handle websockets errors.
             *
             * Parameters:
             * (Object) error - The websocket error.
             */
      _onError: function (error) {
        Strophe.error('Websocket error ' + error)
        this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, 'The WebSocket connection could not be established or was disconnected.')
        this._disconnect()
      },

            /** PrivateFunction: _onIdle
             *  _Private_ function called by Strophe.Connection._onIdle
             *
             *  sends all queued stanzas
             */
      _onIdle: function () {
        var data = this._conn._data
        if (data.length > 0 && !this._conn.paused) {
          for (var i = 0; i < data.length; i++) {
            if (data[i] !== null) {
              var stanza, rawStanza
              if (data[i] === 'restart') {
                stanza = this._buildStream().tree()
              } else {
                stanza = data[i]
              }
              rawStanza = Strophe.serialize(stanza)
              this._conn.xmlOutput(stanza)
              this._conn.rawOutput(rawStanza)
              this.socket.send(rawStanza)
            }
          }
          this._conn._data = []
        }
      },

            /** PrivateFunction: _onMessage
             * _Private_ function to handle websockets messages.
             *
             * This function parses each of the messages as if they are full documents.
             * [TODO : We may actually want to use a SAX Push parser].
             *
             * Since all XMPP traffic starts with
             *  <stream:stream version='1.0'
             *                 xml:lang='en'
             *                 xmlns='jabber:client'
             *                 xmlns:stream='http://etherx.jabber.org/streams'
             *                 id='3697395463'
             *                 from='SERVER'>
             *
             * The first stanza will always fail to be parsed.
             *
             * Additionally, the seconds stanza will always be <stream:features> with
             * the stream NS defined in the previous stanza, so we need to 'force'
             * the inclusion of the NS in this stanza.
             *
             * Parameters:
             * (string) message - The websocket message.
             */
      _onMessage: function (message) {
        WebIM && WebIM.config.isDebug && Strophe.info(WebIM.utils.ts() + 'recv:', message.data)

        var elem, data
                // check for closing stream
        var close = '<close xmlns="urn:ietf:params:xml:ns:xmpp-framing" />'
        if (message.data === close) {
          this._conn.rawInput(close)
          this._conn.xmlInput(message)
          if (!this._conn.disconnecting) {
            this._conn._doDisconnect()
          }
          return
        } else if (message.data.search('<open ') === 0) {
                    // This handles stream restarts
          elem = new DOMParser().parseFromString(message.data, 'text/xml').documentElement
          if (!this._handleStreamStart(elem)) {
            return
          }
        } else {
          data = this._streamWrap(message.data)
          elem = new DOMParser().parseFromString(data, 'text/xml').documentElement
        }

        if (this._check_streamerror(elem, Strophe.Status.ERROR)) {
          return
        }

                // handle unavailable presence stanza before disconnecting
        if (this._conn.disconnecting &&
                    elem.firstChild.nodeName === 'presence' &&
                    elem.firstChild.getAttribute('type') === 'unavailable') {
          this._conn.xmlInput(elem)
          this._conn.rawInput(Strophe.serialize(elem))
                    // if we are already disconnecting we will ignore the unavailable stanza and
                    // wait for the </stream:stream> tag before we close the connection
          return
        }
        this._conn._dataRecv(elem, message.data)
      },

            /** PrivateFunction: _onOpen
             * _Private_ function to handle websockets connection setup.
             *
             * The opening stream tag is sent here.
             */
      _onOpen: function () {
        Strophe.info('Websocket open')
        var start = this._buildStream()
        this._conn.xmlOutput(start.tree())

        var startString = Strophe.serialize(start)
        this._conn.rawOutput(startString)
        this.socket.send(startString)
      },

            /** PrivateFunction: _reqToData
             * _Private_ function to get a stanza out of a request.
             *
             * WebSockets don't use requests, so the passed argument is just returned.
             *
             *  Parameters:
             *    (Object) stanza - The stanza.
             *
             *  Returns:
             *    The stanza that was passed.
             */
      _reqToData: function (stanza) {
        return stanza
      },

            /** PrivateFunction: _send
             *  _Private_ part of the Connection.send function for WebSocket
             *
             * Just flushes the messages that are in the queue
             */
      _send: function () {
        this._conn.flush()
      },

            /** PrivateFunction: _sendRestart
             *
             *  Send an xmpp:restart stanza.
             */
      _sendRestart: function () {
        clearTimeout(this._conn._idleTimeout)
        this._conn._onIdle.bind(this._conn)()
      }
    }
    return Strophe
  }));

  (function (root) {
    if (typeof define === 'function' && define.amd) {
      define('strophe', [
        'strophe-core',
        'strophe-bosh',
        'strophe-websocket'
      ], function (wrapper) {
        return wrapper
      })
    }
  })(this)

    /* jshint ignore:start */
  if (callback) {
    if (typeof define === 'function' && define.amd) {
            // For backwards compatability
      var n_callback = callback
      if (typeof requirejs === 'function') {
        requirejs(['strophe'], function (o) {
          n_callback(o.Strophe, o.$build, o.$msg, o.$iq, o.$pres)
        })
      } else {
        require(['strophe'], function (o) {
          n_callback(o.Strophe, o.$build, o.$msg, o.$iq, o.$pres)
        })
      }
    } else {
      return callback(Strophe, $build, $msg, $iq, $pres)
    }
  }
}.bind(window))(function (Strophe, build, msg, iq, pres) {
  window.Strophe = Strophe
  window.$build = build
  window.$msg = msg
  window.$iq = iq
  window.$pres = pres
})
/* jshint ignore:end */