strophe.js

/** File: strophe.js
 *  A JavaScript library for writing XMPP clients.
 *
 *  This library uses either Bidirectional-streams Over Synchronous HTTP (BOSH)
 *  to emulate a persistent, stateful, two-way connection to an XMPP server or
 *  alternatively WebSockets.
 *
 *  More information on BOSH can be found in XEP 124.
 *  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 (root, factory) {
    if (typeof define === 'function' && define.amd) {
        //Allow using this built library as an AMD module
        //in another project. That other project will only
        //see this AMD call, not the internal modules in
        //the closure below.
        define([], factory);
    } else {
        //Browser globals case.
        var wrapper = factory();
        root.Strophe        = wrapper.Strophe;
        root.$build         = wrapper.$build;
        root.$iq            = wrapper.$iq;
        root.$msg           = wrapper.$msg;
        root.$pres          = wrapper.$pres;
        root.SHA1           = wrapper.SHA1;
        root.MD5            = wrapper.MD5;
        root.b64_hmac_sha1  = wrapper.b64_hmac_sha1;
        root.b64_sha1       = wrapper.b64_sha1;
        root.str_hmac_sha1  = wrapper.str_hmac_sha1;
        root.str_sha1       = wrapper.str_sha1;
    }
}(this, function () {
    //almond, and your modules will be inlined here
/* jshint ignore:end */
/**
 * @license almond 0.3.3 Copyright jQuery Foundation and other contributors.
 * Released under MIT license, http://github.com/requirejs/almond/LICENSE
 */
//Going sloppy to avoid 'use strict' string cost, but strict practices should
//be followed.
/*global setTimeout: false */

var requirejs, require, define;
(function (undef) {
    var main, req, makeMap, handlers,
        defined = {},
        waiting = {},
        config = {},
        defining = {},
        hasOwn = Object.prototype.hasOwnProperty,
        aps = [].slice,
        jsSuffixRegExp = /\.js$/;

    function hasProp(obj, prop) {
        return hasOwn.call(obj, prop);
    }

    /**
     * Given a relative module name, like ./something, normalize it to
     * a real name that can be mapped to a path.
     * @param {String} name the relative name
     * @param {String} baseName a real name that the name arg is relative
     * to.
     * @returns {String} normalized name
     */
    function normalize(name, baseName) {
        var nameParts, nameSegment, mapValue, foundMap, lastIndex,
            foundI, foundStarMap, starI, i, j, part, normalizedBaseParts,
            baseParts = baseName && baseName.split("/"),
            map = config.map,
            starMap = (map && map['*']) || {};

        //Adjust any relative paths.
        if (name) {
            name = name.split('/');
            lastIndex = name.length - 1;

            // If wanting node ID compatibility, strip .js from end
            // of IDs. Have to do this here, and not in nameToUrl
            // because node allows either .js or non .js to map
            // to same file.
            if (config.nodeIdCompat && jsSuffixRegExp.test(name[lastIndex])) {
                name[lastIndex] = name[lastIndex].replace(jsSuffixRegExp, '');
            }

            // Starts with a '.' so need the baseName
            if (name[0].charAt(0) === '.' && baseParts) {
                //Convert baseName to array, and lop off the last part,
                //so that . matches that 'directory' and not name of the baseName's
                //module. For instance, baseName of 'one/two/three', maps to
                //'one/two/three.js', but we want the directory, 'one/two' for
                //this normalization.
                normalizedBaseParts = baseParts.slice(0, baseParts.length - 1);
                name = normalizedBaseParts.concat(name);
            }

            //start trimDots
            for (i = 0; i < name.length; i++) {
                part = name[i];
                if (part === '.') {
                    name.splice(i, 1);
                    i -= 1;
                } else if (part === '..') {
                    // If at the start, or previous value is still ..,
                    // keep them so that when converted to a path it may
                    // still work when converted to a path, even though
                    // as an ID it is less than ideal. In larger point
                    // releases, may be better to just kick out an error.
                    if (i === 0 || (i === 1 && name[2] === '..') || name[i - 1] === '..') {
                        continue;
                    } else if (i > 0) {
                        name.splice(i - 1, 2);
                        i -= 2;
                    }
                }
            }
            //end trimDots

            name = name.join('/');
        }

        //Apply map config if available.
        if ((baseParts || starMap) && map) {
            nameParts = name.split('/');

            for (i = nameParts.length; i > 0; i -= 1) {
                nameSegment = nameParts.slice(0, i).join("/");

                if (baseParts) {
                    //Find the longest baseName segment match in the config.
                    //So, do joins on the biggest to smallest lengths of baseParts.
                    for (j = baseParts.length; j > 0; j -= 1) {
                        mapValue = map[baseParts.slice(0, j).join('/')];

                        //baseName segment has  config, find if it has one for
                        //this name.
                        if (mapValue) {
                            mapValue = mapValue[nameSegment];
                            if (mapValue) {
                                //Match, update name to the new value.
                                foundMap = mapValue;
                                foundI = i;
                                break;
                            }
                        }
                    }
                }

                if (foundMap) {
                    break;
                }

                //Check for a star map match, but just hold on to it,
                //if there is a shorter segment match later in a matching
                //config, then favor over this star map.
                if (!foundStarMap && starMap && starMap[nameSegment]) {
                    foundStarMap = starMap[nameSegment];
                    starI = i;
                }
            }

            if (!foundMap && foundStarMap) {
                foundMap = foundStarMap;
                foundI = starI;
            }

            if (foundMap) {
                nameParts.splice(0, foundI, foundMap);
                name = nameParts.join('/');
            }
        }

        return name;
    }

    function makeRequire(relName, forceSync) {
        return function () {
            //A version of a require function that passes a moduleName
            //value for items that may need to
            //look up paths relative to the moduleName
            var args = aps.call(arguments, 0);

            //If first arg is not require('string'), and there is only
            //one arg, it is the array form without a callback. Insert
            //a null so that the following concat is correct.
            if (typeof args[0] !== 'string' && args.length === 1) {
                args.push(null);
            }
            return req.apply(undef, args.concat([relName, forceSync]));
        };
    }

    function makeNormalize(relName) {
        return function (name) {
            return normalize(name, relName);
        };
    }

    function makeLoad(depName) {
        return function (value) {
            defined[depName] = value;
        };
    }

    function callDep(name) {
        if (hasProp(waiting, name)) {
            var args = waiting[name];
            delete waiting[name];
            defining[name] = true;
            main.apply(undef, args);
        }

        if (!hasProp(defined, name) && !hasProp(defining, name)) {
            throw new Error('No ' + name);
        }
        return defined[name];
    }

    //Turns a plugin!resource to [plugin, resource]
    //with the plugin being undefined if the name
    //did not have a plugin prefix.
    function splitPrefix(name) {
        var prefix,
            index = name ? name.indexOf('!') : -1;
        if (index > -1) {
            prefix = name.substring(0, index);
            name = name.substring(index + 1, name.length);
        }
        return [prefix, name];
    }

    //Creates a parts array for a relName where first part is plugin ID,
    //second part is resource ID. Assumes relName has already been normalized.
    function makeRelParts(relName) {
        return relName ? splitPrefix(relName) : [];
    }

    /**
     * Makes a name map, normalizing the name, and using a plugin
     * for normalization if necessary. Grabs a ref to plugin
     * too, as an optimization.
     */
    makeMap = function (name, relParts) {
        var plugin,
            parts = splitPrefix(name),
            prefix = parts[0],
            relResourceName = relParts[1];

        name = parts[1];

        if (prefix) {
            prefix = normalize(prefix, relResourceName);
            plugin = callDep(prefix);
        }

        //Normalize according
        if (prefix) {
            if (plugin && plugin.normalize) {
                name = plugin.normalize(name, makeNormalize(relResourceName));
            } else {
                name = normalize(name, relResourceName);
            }
        } else {
            name = normalize(name, relResourceName);
            parts = splitPrefix(name);
            prefix = parts[0];
            name = parts[1];
            if (prefix) {
                plugin = callDep(prefix);
            }
        }

        //Using ridiculous property names for space reasons
        return {
            f: prefix ? prefix + '!' + name : name, //fullName
            n: name,
            pr: prefix,
            p: plugin
        };
    };

    function makeConfig(name) {
        return function () {
            return (config && config.config && config.config[name]) || {};
        };
    }

    handlers = {
        require: function (name) {
            return makeRequire(name);
        },
        exports: function (name) {
            var e = defined[name];
            if (typeof e !== 'undefined') {
                return e;
            } else {
                return (defined[name] = {});
            }
        },
        module: function (name) {
            return {
                id: name,
                uri: '',
                exports: defined[name],
                config: makeConfig(name)
            };
        }
    };

    main = function (name, deps, callback, relName) {
        var cjsModule, depName, ret, map, i, relParts,
            args = [],
            callbackType = typeof callback,
            usingExports;

        //Use name if no relName
        relName = relName || name;
        relParts = makeRelParts(relName);

        //Call the callback to define the module, if necessary.
        if (callbackType === 'undefined' || callbackType === 'function') {
            //Pull out the defined dependencies and pass the ordered
            //values to the callback.
            //Default to [require, exports, module] if no deps
            deps = !deps.length && callback.length ? ['require', 'exports', 'module'] : deps;
            for (i = 0; i < deps.length; i += 1) {
                map = makeMap(deps[i], relParts);
                depName = map.f;

                //Fast path CommonJS standard dependencies.
                if (depName === "require") {
                    args[i] = handlers.require(name);
                } else if (depName === "exports") {
                    //CommonJS module spec 1.1
                    args[i] = handlers.exports(name);
                    usingExports = true;
                } else if (depName === "module") {
                    //CommonJS module spec 1.1
                    cjsModule = args[i] = handlers.module(name);
                } else if (hasProp(defined, depName) ||
                           hasProp(waiting, depName) ||
                           hasProp(defining, depName)) {
                    args[i] = callDep(depName);
                } else if (map.p) {
                    map.p.load(map.n, makeRequire(relName, true), makeLoad(depName), {});
                    args[i] = defined[depName];
                } else {
                    throw new Error(name + ' missing ' + depName);
                }
            }

            ret = callback ? callback.apply(defined[name], args) : undefined;

            if (name) {
                //If setting exports via "module" is in play,
                //favor that over return value and exports. After that,
                //favor a non-undefined return value over exports use.
                if (cjsModule && cjsModule.exports !== undef &&
                        cjsModule.exports !== defined[name]) {
                    defined[name] = cjsModule.exports;
                } else if (ret !== undef || !usingExports) {
                    //Use the return value from the function.
                    defined[name] = ret;
                }
            }
        } else if (name) {
            //May just be an object definition for the module. Only
            //worry about defining if have a module name.
            defined[name] = callback;
        }
    };

    requirejs = require = req = function (deps, callback, relName, forceSync, alt) {
        if (typeof deps === "string") {
            if (handlers[deps]) {
                //callback in this case is really relName
                return handlers[deps](callback);
            }
            //Just return the module wanted. In this scenario, the
            //deps arg is the module name, and second arg (if passed)
            //is just the relName.
            //Normalize module name, if it contains . or ..
            return callDep(makeMap(deps, makeRelParts(callback)).f);
        } else if (!deps.splice) {
            //deps is a config object, not an array.
            config = deps;
            if (config.deps) {
                req(config.deps, config.callback);
            }
            if (!callback) {
                return;
            }

            if (callback.splice) {
                //callback is an array, which means it is a dependency list.
                //Adjust args if there are dependencies
                deps = callback;
                callback = relName;
                relName = null;
            } else {
                deps = undef;
            }
        }

        //Support require(['a'])
        callback = callback || function () {};

        //If relName is a function, it is an errback handler,
        //so remove it.
        if (typeof relName === 'function') {
            relName = forceSync;
            forceSync = alt;
        }

        //Simulate async callback;
        if (forceSync) {
            main(undef, deps, callback, relName);
        } else {
            //Using a non-zero value because of concern for what old browsers
            //do, and latest browsers "upgrade" to 4 if lower value is used:
            //http://www.whatwg.org/specs/web-apps/current-work/multipage/timers.html#dom-windowtimers-settimeout:
            //If want a value immediately, use require('id') instead -- something
            //that works in almond on the global level, but not guaranteed and
            //unlikely to work in other AMD implementations.
            setTimeout(function () {
                main(undef, deps, callback, relName);
            }, 4);
        }

        return req;
    };

    /**
     * Just drops the config on the floor, but returns req in case
     * the config return value is used.
     */
    req.config = function (cfg) {
        return req(cfg);
    };

    /**
     * Expose module registry for debugging and tooling
     */
    requirejs._defined = defined;

    define = function (name, deps, callback) {
        if (typeof name !== 'string') {
            throw new Error('See almond README: incorrect module build, no module name');
        }

        //This module may not have dependencies
        if (!deps.splice) {
            //deps is not an array, so probably means
            //an object literal or factory function for
            //the value. Adjust args.
            callback = deps;
            deps = [];
        }

        if (!hasProp(defined, name) && !hasProp(waiting, name)) {
            waiting[name] = [name, deps, callback];
        }
    };

    define.amd = {
        jQuery: true
    };
}());

define("node_modules/almond/almond.js", function(){});

/*
    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(root);
        });
    } else {
        // Browser globals
        return factory(root);
    }
}(this, function (root) {

/** Function: 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 <MDC's bind() documentation at https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind>
 *  and <Bound Functions and Function Imports in JavaScript at http://benjamin.smedbergs.us/blog/2007-01-03/bound-functions-and-function-imports-in-javascript/>
 *  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)));
        };
    };
}

/** Function: 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]';
    };
}

/** Function: 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;
    };
}

/** Function: Array.prototype.forEach
 *
 *  This function is not available in IE < 9
 *
 *  See <forEach on developer.mozilla.org at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach>
 */
if (!Array.prototype.forEach) {
    Array.prototype.forEach = function(callback, thisArg) {
        var T, k;
        if (this === null) {
            throw new TypeError(' this is null or not defined');
        }
        // 1. Let O be the result of calling toObject() passing the
        // |this| value as the argument.
        var O = Object(this);
        // 2. Let lenValue be the result of calling the Get() internal
        // method of O with the argument "length".
        // 3. Let len be toUint32(lenValue).
        var len = O.length >>> 0;
        // 4. If isCallable(callback) is false, throw a TypeError exception.
        // See: http://es5.github.com/#x9.11
        if (typeof callback !== "function") {
            throw new TypeError(callback + ' is not a function');
        }
        // 5. If thisArg was supplied, let T be thisArg; else let
        // T be undefined.
        if (arguments.length > 1) {
            T = thisArg;
        }
        // 6. Let k be 0
        k = 0;
        // 7. Repeat, while k < len
        while (k < len) {
            var kValue;
            // a. Let Pk be ToString(k).
            //        This is implicit for LHS operands of the in operator
            // b. Let kPresent be the result of calling the HasProperty
            //        internal method of O with argument Pk.
            //        This step can be combined with c
            // c. If kPresent is true, then
            if (k in O) {
                // i. Let kValue be the result of calling the Get internal
                // method of O with argument Pk.
                kValue = O[k];
                // ii. Call the Call internal method of callback with T as
                // the this value and argument list containing kValue, k, and O.
                callback.call(T, kValue, k, O);
            }
            // d. Increase k by 1.
            k++;
        }
        // 8. return undefined
    };
}

// 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
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
if (!root.btoa) {
    root.btoa = function (input) {
        /**
         * Encodes a string in base64
         * @param {String} input The string to encode in base64.
         */
        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;
    };
}

if (!root.atob) {
    root.atob = function (input) {
        /**
         * Decodes a base64 string.
         * @param {String} input The string to decode.
         */
        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;
    };
}
}));

/*
 * 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: false */
/* 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 if (typeof exports === 'object') {
        module.exports = 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 if (typeof exports === 'object') {
        module.exports = factory();
    } else {
        // Browser globals
        root.MD5 = factory();
    }
}(this, function () {
    /*
     * 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 if (typeof exports === 'object') {
        module.exports = 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, document, sessionStorage, setTimeout, clearTimeout, ActiveXObject, DOMParser, btoa, atob */

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        define('strophe-core',[
            'strophe-sha1',
            'strophe-md5',
            'strophe-utils'
        ], function () {
            return factory.apply(this, arguments);
        });
    }  else if (typeof exports === 'object') {
        module.exports = factory(
            require('./sha1'),
            require('./md5'),
            require('./utils')
        );
    } else {
        // Browser globals
        var o = factory(root.SHA1, root.MD5, root.stropheUtils);
        root.Strophe =        o.Strophe;
        root.$build =         o.$build;
        root.$iq =            o.$iq;
        root.$msg =           o.$msg;
        root.$pres =          o.$pres;
        root.SHA1 =           o.SHA1;
        root.MD5 =            o.MD5;
        root.b64_hmac_sha1 =  o.SHA1.b64_hmac_sha1;
        root.b64_sha1 =       o.SHA1.b64_sha1;
        root.str_hmac_sha1 =  o.SHA1.str_hmac_sha1;
        root.str_sha1 =       o.SHA1.str_sha1;
    }
}(this, function (SHA1, 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 */
    VERSION: "1.2.15",

    /** 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.REDIRECT - The connection has been redirected
     *  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
    },

    ErrorCondition: {
        BAD_FORMAT: "bad-format",
        CONFLICT: "conflict",
        MISSING_JID_NODE: "x-strophe-bad-non-anon-jid",
        NO_AUTH_MECH: "no-auth-mech",
        UNKNOWN_REASON: "unknown",
    },

    /** 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 (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;
    },

    /** PrivateFunction: _handleError
     *  _Private_ function that properly logs an error to the console
     */
    _handleError: function (e) {
        if (typeof e.stack !== "undefined") {
            Strophe.fatal(e.stack);
        }
        if (e.sourceURL) {
            Strophe.fatal("error: " + this.handler + " " + e.sourceURL + ":" +
                          e.line + " - " + e.name + ": " + e.message);
        } else if (e.fileName) {
            Strophe.fatal("error: " + this.handler + " " +
                          e.fileName + ":" + e.lineNumber + " - " +
                          e.name + ": " + e.message);
        } else {
            Strophe.fatal("error: " + e.message);
        }
    },

    /** 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 logs only fatal errors.  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.
     */
    log: function (level, msg) {
        if (level === this.LogLevel.FATAL &&
            typeof window.console === 'object' &&
            typeof window.console.error === 'function') {
            window.console.error(msg);
        }
    },

    /** 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: root
     *  Make the root element the new current element.
     *
     *  When at a deeply nested element in the tree, this function can be used
     *  to jump back to the root of the tree, instead of having to repeatedly
     *  call up().
     *
     *  Returns:
     *    The Stophe.Builder object.
     */
    root: function () {
        this.node = this.nodeTree;
        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 || {'matchBareFromJid': false, 'ignoreNamespaceFragment': false};
    // BBB: Maintain backward compatibility with old `matchBare` option
    if (this.options.matchBare) {
        Strophe.warn('The "matchBare" option is deprecated, use "matchBareFromJid" instead.');
        this.options.matchBareFromJid = this.options.matchBare;
        delete this.options.matchBare;
    }

    if (this.options.matchBareFromJid) {
        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: getNamespace
     *  Returns the XML namespace attribute on an element.
     *  If `ignoreNamespaceFragment` was passed in for this handler, then the
     *  URL fragment will be stripped.
     *
     *  Parameters:
     *    (XMLElement) elem - The XML element with the namespace.
     *
     *  Returns:
     *    The namespace, with optionally the fragment stripped.
     */
    getNamespace: function (elem) {
        var elNamespace = elem.getAttribute("xmlns");
        if (elNamespace && this.options.ignoreNamespaceFragment) {
            elNamespace = elNamespace.split('#')[0];
        }
        return elNamespace;
    },

    /** PrivateFunction: namespaceMatch
     *  Tests if a stanza matches the namespace set for this Strophe.Handler.
     *
     *  Parameters:
     *    (XMLElement) elem - The XML element to test.
     *
     *  Returns:
     *    true if the stanza matches and false otherwise.
     */
    namespaceMatch: function (elem) {
        var nsMatch = false;
        if (!this.ns) {
            return true;
        } else {
            var that = this;
            Strophe.forEachChild(elem, null, function (elem) {
                if (that.getNamespace(elem) === that.ns) {
                    nsMatch = true;
                }
            });
            nsMatch = nsMatch || this.getNamespace(elem) === this.ns;
        }
        return nsMatch;
    },

    /** 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 from = elem.getAttribute('from');
        if (this.options.matchBareFromJid) {
            from = Strophe.getBareJidFromJid(from);
        }
        var elem_type = elem.getAttribute("type");
        if (this.namespaceMatch(elem) &&
            (!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) {
            Strophe._handleError(e);
            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:
 *  ------------------------------------------
 *
 *  cookies:
 *
 *  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.
 *
 *  mechanisms:
 *
 *  The *mechanisms* option allows you to specify the SASL mechanisms that this
 *  instance of Strophe.Connection (and therefore your XMPP client) will
 *  support.
 *
 *  The value must be an array of objects with Strophe.SASLMechanism
 *  prototypes.
 *
 *  If nothing is specified, then the following mechanisms (and their
 *  priorities) are registered:
 *
 *      SCRAM-SHA1 - 70
 *      DIGEST-MD5 - 60
 *      PLAIN - 50
 *      OAUTH-BEARER - 40
 *      OAUTH-2 - 30
 *      ANONYMOUS - 20
 *      EXTERNAL - 10
 *
 *  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.protocolErrorHandlers = {
        'HTTP': {},
        'websocket': {}
    };

    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);
    this.registerSASLMechanisms(this.options.mechanisms);

    // 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.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: addProtocolErrorHandler
     *  Register a handler function for when a protocol (websocker or HTTP)
     *  error occurs.
     *
     *  NOTE: Currently only HTTP errors for BOSH requests are handled.
     *  Patches that handle websocket errors would be very welcome.
     *
     *  Parameters:
     *    (String) protocol - 'HTTP' or 'websocket'
     *    (Integer) status_code - Error status code (e.g 500, 400 or 404)
     *    (Function) callback - Function that will fire on Http error
     *
     *  Example:
     *  function onError(err_code){
     *    //do stuff
     *  }
     *
     *  var conn = Strophe.connect('http://example.com/http-bind');
     *  conn.addProtocolErrorHandler('HTTP', 500, onError);
     *  // Triggers HTTP 500 error and onError handler will be called
     *  conn.connect('user_jid@incorrect_jabber_host', 'secret', onConnect);
     */
    addProtocolErrorHandler: function(protocol, status_code, callback){
        this.protocolErrorHandlers[protocol][status_code] = callback;
    },


    /** 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 OAUTHBEARER or
     *      SASL ANONYMOUS authentication will be attempted (OAUTHBEARER will
     *      process the provided password value as an access token).
     *    (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 {
                sessionStorage.setItem('_strophe_', '_strophe_');
                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: sendPresence
     *  Helper function to send presence stanzas. The main benefit is for
     *  sending presence stanzas for which you expect a responding presence
     *  stanza with the same id (for example when leaving a chat room).
     *
     *  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 presence.
     */
    sendPresence: function(elem, callback, errback, timeout) {
        var timeoutHandler = null;
        var that = this;
        if (typeof(elem.tree) === "function") {
            elem = elem.tree();
        }
        var id = elem.getAttribute('id');
        if (!id) { // inject id if not found
            id = this.getUniqueId("sendPresence");
            elem.setAttribute("id", id);
        }

        if (typeof callback === "function" || typeof errback === "function") {
            var handler = this.addHandler(function (stanza) {
                // remove timeout handler if there is one
                if (timeoutHandler) {
                    that.deleteTimedHandler(timeoutHandler);
                }
                var type = stanza.getAttribute('type');
                if (type === 'error') {
                    if (errback) {
                        errback(stanza);
                    }
                } else if (callback) {
                    callback(stanza);
                }
            }, null, 'presence', null, id);

            // if timeout specified, set up a 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;
    },

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

        if (typeof callback === "function" || typeof errback === "function") {
            var handler = this.addHandler(function (stanza) {
                // remove timeout handler if there is one
                if (timeoutHandler) {
                    that.deleteTimedHandler(timeoutHandler);
                }
                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, set up a 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.
     *
     *  Options
     *  ~~~~~~~
     *  With the options argument, you can specify boolean flags that affect how
     *  matches are being done.
     *
     *  Currently two flags exist:
     *
     *  - matchBareFromJid:
     *      When set to 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 {matchBareFromJid: true} as the
     *      value of options. The default value for matchBareFromJid is false.
     *
     *  - ignoreNamespaceFragment:
     *      When set to true, a fragment specified on the stanza's namespace
     *      URL will be ignored when it's matched with the one configured for
     *      the handler.
     *
     *      This means that if you register like this:
     *      >   connection.addHandler(
     *      >       handler,
     *      >       'http://jabber.org/protocol/muc',
     *      >       null, null, null, null,
     *      >       {'ignoreNamespaceFragment': true}
     *      >   );
     *
     *      Then a stanza with XML namespace of
     *      'http://jabber.org/protocol/muc#user' will also be matched. If
     *      'ignoreNamespaceFragment' is false, then only stanzas with
     *      'http://jabber.org/protocol/muc' will be matched.
     *
     *  Deleting the handler
     *  ~~~~~~~~~~~~~~~~~~~~
     *  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|Array) type - The stanza type (or types if an array) 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: registerSASLMechanisms
     *
     * Register the SASL mechanisms which will be supported by this instance of
     * Strophe.Connection (i.e. which this XMPP client will support).
     *
     *  Parameters:
     *    (Array) mechanisms - Array of objects with Strophe.SASLMechanism prototypes
     *
     */
    registerSASLMechanisms: function (mechanisms) {
        this.mechanisms = {};
        mechanisms = mechanisms || [
            Strophe.SASLAnonymous,
            Strophe.SASLExternal,
            Strophe.SASLMD5,
            Strophe.SASLOAuthBearer,
            Strophe.SASLXOAuth2,
            Strophe.SASLPlain,
            Strophe.SASLSHA1
        ];
        mechanisms.forEach(this.registerSASLMechanism.bind(this));
    },

    /** Function: registerSASLMechanism
     *
     * Register a single SASL mechanism, to be supported by this client.
     *
     *  Parameters:
     *    (Object) mechanism - Object with a Strophe.SASLMechanism prototype
     *
     */
    registerSASLMechanism: function (mechanism) {
        this.mechanisms[mechanism.prototype.name] = mechanism;
    },

    /** 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();
            this._doDisconnect();
        }
    },

    /** 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
     *    (XMLElement) elem - The triggering stanza.
     */
    _changeConnectStatus: function (status, condition, elem) {
        // 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, elem);
            } catch (e) {
                Strophe._handleError(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");
        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,
                    Strophe.ErrorCondition.UNKOWN_REASON
                );
            }
            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 Connection.
     */
    mechanisms: {},

    /** PrivateFunction: _no_auth_received
     *
     * Called on stream start/restart when no stream:features
     * has been received or when no viable authentication mechanism is offered.
     *
     * Sends a blank poll request.
     */
    _no_auth_received: function (_callback) {
        var error_msg =  "Server did not offer a supported authentication mechanism";
        Strophe.error(error_msg);
        this._changeConnectStatus(
            Strophe.Status.CONNFAIL,
            Strophe.ErrorCondition.NO_AUTH_MECH
        );
        if (_callback) {
            _callback.call(this);
        }
        this._doDisconnect();
    },

    /** 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 they
     *      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,
                Strophe.ErrorCondition.BAD_FORMAT
            );
            this._doDisconnect(Strophe.ErrorCondition.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;
        }

        // 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;
        }
        if (!hasFeatures) {
            this._no_auth_received(_callback);
            return;
        }

        var matched = [], i, mech;
        var mechanisms = bodyWrap.getElementsByTagName("mechanism");
        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]);
            }
        }
        if (matched.length === 0) {
            if (bodyWrap.getElementsByTagName("auth").length === 0) {
                // There are no matching SASL mechanisms and also no legacy
                // auth available.
                this._no_auth_received(_callback);
                return;
            }
        }
        if (this.do_authentication !== false) {
            this.authenticate(matched);
        }
    },

    /** Function: sortMechanismsByPriority
     *
     *  Sorts an array of objects with prototype SASLMechanism according to
     *  their priorities.
     *
     *  Parameters:
     *    (Array) mechanisms - Array of SASL mechanisms.
     *
     */
    sortMechanismsByPriority: function (mechanisms) {
        // Sorting mechanisms according to priority.
        var i, j, higher, swap;
        for (i = 0; i < mechanisms.length - 1; ++i) {
            higher = i;
            for (j = i + 1; j < mechanisms.length; ++j) {
                if (mechanisms[j].prototype.priority > mechanisms[higher].prototype.priority) {
                    higher = j;
                }
            }
            if (higher !== i) {
                swap = mechanisms[i];
                mechanisms[i] = mechanisms[higher];
                mechanisms[higher] = swap;
            }
        }
        return mechanisms;
    },

    /** PrivateFunction: _attemptSASLAuth
     *
     *  Iterate through an array of SASL mechanisms and attempt authentication
     *  with the highest priority (enabled) mechanism.
     *
     *  Parameters:
     *    (Array) mechanisms - Array of SASL mechanisms.
     *
     *  Returns:
     *    (Boolean) mechanism_found - true or false, depending on whether a
     *          valid SASL mechanism was found with which authentication could be
     *          started.
     */
    _attemptSASLAuth: function (mechanisms) {
        mechanisms = this.sortMechanismsByPriority(mechanisms || []);
        var i = 0, mechanism_found = false;
        for (i = 0; i < mechanisms.length; ++i) {
            if (!mechanisms[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 mechanisms[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(btoa(response));
            }
            this.send(request_auth_exchange.tree());
            mechanism_found = true;
            break;
        }
        return mechanism_found;
    },

    /** PrivateFunction: _attemptLegacyAuth
     *
     *  Attempt legacy (i.e. non-SASL) authentication.
     *
     */
    _attemptLegacyAuth: function () {
        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,
                Strophe.ErrorCondition.MISSING_JID_NODE
            );
            this.disconnect(Strophe.ErrorCondition.MISSING_JID_NODE);
        } 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());
        }
    },

    /** Function: authenticate
     * Set up authentication
     *
     *  Continues the initial connection request by setting up authentication
     *  handlers and starting the authentication process.
     *
     *  SASL authentication will be attempted if available, otherwise
     *  the code will fall back to legacy authentication.
     *
     *  Parameters:
     *    (Array) matched - Array of SASL mechanisms supported.
     *
     */
    authenticate: function (matched) {
        if (!this._attemptSASLAuth(matched)) {
            this._attemptLegacyAuth();
        }
    },

    /** PrivateFunction: _sasl_challenge_cb
     *  _Private_ handler for the SASL challenge
     *
     */
    _sasl_challenge_cb: function(elem) {
      var challenge = atob(Strophe.getText(elem));
      var response = this._sasl_mechanism.onChallenge(this, challenge);
      var stanza = $build('response', {
          'xmlns': Strophe.NS.SASL
      });
      if (response !== "") {
        stanza.t(btoa(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 = atob(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 = Strophe.ErrorCondition.CONFLICT;
            }
            this._changeConnectStatus(Strophe.Status.AUTHFAIL, condition, elem);
            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, elem);
            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, elem);
            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, elem);
        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, elem);
            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
 *
 *      OAUTHBEARER - 60
 *      SCRAM-SHA1 - 50
 *      DIGEST-MD5 - 40
 *      PLAIN - 30
 *      ANONYMOUS - 20
 *      EXTERNAL - 10
 *
 *  See: Strophe.Connection.addSupportedSASLMechanisms
 */

/**
 * 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
   *  Strophe.SASLXOAuth2 - SASL X-OAuth2 authentication
   */

// Building SASL callbacks

/** PrivateConstructor: SASLAnonymous
 *  SASL ANONYMOUS authentication.
 */
Strophe.SASLAnonymous = function() {};
Strophe.SASLAnonymous.prototype = new Strophe.SASLMechanism("ANONYMOUS", false, 20);

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


/** PrivateConstructor: SASLPlain
 *  SASL PLAIN authentication.
 */
Strophe.SASLPlain = function() {};
Strophe.SASLPlain.prototype = new Strophe.SASLMechanism("PLAIN", true, 50);

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);
};


/** PrivateConstructor: SASLSHA1
 *  SASL SCRAM SHA 1 authentication.
 */
Strophe.SASLSHA1 = function() {};
Strophe.SASLSHA1.prototype = new Strophe.SASLMechanism("SCRAM-SHA-1", true, 70);

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 = atob(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=" + btoa(SHA1.binb2str(clientKey));
    return responseText;
  }.bind(this);

  return auth_str;
};


/** PrivateConstructor: SASLMD5
 *  SASL DIGEST MD5 authentication.
 */
Strophe.SASLMD5 = function() {};
Strophe.SASLMD5.prototype = new Strophe.SASLMechanism("DIGEST-MD5", false, 60);

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;
};


/** PrivateConstructor: SASLOAuthBearer
 *  SASL OAuth Bearer authentication.
 */
Strophe.SASLOAuthBearer = function() {};
Strophe.SASLOAuthBearer.prototype = new Strophe.SASLMechanism("OAUTHBEARER", true, 40);

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

Strophe.SASLOAuthBearer.prototype.onChallenge = function(connection) {
    var auth_str = 'n,';
    if (connection.authcid !== null) {
      auth_str = auth_str + 'a=' + 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);
};


/** 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, 10);

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;
};


/** PrivateConstructor: SASLXOAuth2
 *  SASL X-OAuth2 authentication.
 */
Strophe.SASLXOAuth2 = function () { };
Strophe.SASLXOAuth2.prototype = new Strophe.SASLMechanism("X-OAUTH2", true, 30);

Strophe.SASLXOAuth2.prototype.test = function (connection) {
    return connection.pass !== null;
};

Strophe.SASLXOAuth2.prototype.onChallenge = function (connection) {
    var auth_str = '\u0000';
    if (connection.authcid !== null) {
        auth_str = auth_str + connection.authzid;
    }
    auth_str = auth_str + "\u0000";
    auth_str = auth_str + connection.pass;

    return utils.utf16to8(auth_str);
};


return {
    'Strophe':         Strophe,
    '$build':          $build,
    '$iq':             $iq,
    '$msg':            $msg,
    '$pres':           $pres,
    'SHA1':            SHA1,
    'MD5':             MD5,
    'b64_hmac_sha1':   SHA1.b64_hmac_sha1,
    'b64_sha1':        SHA1.b64_sha1,
    'str_hmac_sha1':   SHA1.str_hmac_sha1,
    'str_sha1':        SHA1.str_sha1
};
}));

/*
    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 if (typeof exports === 'object') {
        var core = require('./core');

        module.exports = 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) {
            // In React Native, we may get responseText but no responseXML.  We can try to parse it manually.
            Strophe.debug("Got responseText but no responseXML; attempting to parse it with DOMParser...");
            node = new DOMParser().parseFromString(this.xhr.responseText, 'application/xml').documentElement;
            if (!node) {
                throw new Error('Parsing produced null node');
            } else if (node.querySelector('parsererror')) {
                Strophe.error("invalid response received: " + node.querySelector('parsererror').textContent);
                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.inactivity = null;

    this.lastResponseHeaders = null;

    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) ||
                        // If authcid is null, then it's an anonymous login, so
                        // we compare only the domains:
                        ((Strophe.getNodeFromJid(jid) === null) && (Strophe.getDomainFromJid(session.jid) === 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); }
        var inactivity = bodyWrap.getAttribute('inactivity');
        if (inactivity) { this.inactivity = parseInt(inactivity, 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: _callProtocolErrorHandlers
     *  _Private_ function to call error handlers registered for HTTP errors.
     *
     *  Parameters:
     *    (Strophe.Request) req - The request that is changing readyState.
     */
    _callProtocolErrorHandlers: function (req) {
        var reqStatus = this._getRequestStatus(req),
            err_callback;
        err_callback = this._conn.protocolErrorHandlers.HTTP[reqStatus];
        if (err_callback) {
            err_callback.call(this, reqStatus);
        }
    },

    /** 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: _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: _getRequestStatus
     *
     *  Returns the HTTP status code from a Strophe.Request
     *
     *  Parameters:
     *    (Strophe.Request) req - The Strophe.Request instance.
     *    (Integer) def - The default value that should be returned if no
     *          status value was found.
     */
    _getRequestStatus: function (req, def) {
        var reqStatus;
        if (req.xhr.readyState === 4) {
            try {
                reqStatus = req.xhr.status;
            } catch (e) {
                // ignore errors from undefined status attribute. Works
                // around a browser bug
                Strophe.error(
                    "Caught an error while retrieving a request's status, " +
                    "reqStatus: " + reqStatus);
            }
        }
        if (typeof(reqStatus) === "undefined") {
            reqStatus = typeof def === 'number' ? def : 0;
        }
        return reqStatus;
    },

    /** 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;
        }
        if (req.xhr.readyState !== 4) {
            // The request is not yet complete
            return;
        }
        var reqStatus = this._getRequestStatus(req);
        this.lastResponseHeaders = req.xhr.getAllResponseHeaders();
        if (this.disconnecting && reqStatus >= 400) {
            this._hitError(reqStatus);
            this._callProtocolErrorHandlers(req);
            return;
        }

        var valid_request = reqStatus > 0 && reqStatus < 500;
        var too_many_retries = req.sends > this._conn.maxRetries;
        if (valid_request || too_many_retries) {
            // remove from internal queue
            this._removeRequest(req);
            Strophe.debug("request id "+req.id+" should now be removed");
        }

        if (reqStatus === 200) {
            // request succeeded
            var reqIs0 = (this._requests[0] === req);
            var reqIs1 = (this._requests[1] === req);
            // 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);
            Strophe.debug("request id "+req.id+"."+req.sends+" got 200");
            func(req); // call handler
            this.errors = 0;
        } else if (reqStatus === 0 ||
                   (reqStatus >= 400 && reqStatus < 600) ||
                   reqStatus >= 12000) {
            // request failed
            Strophe.error("request id "+req.id+"."+req.sends+" error "+reqStatus+" happened");
            this._hitError(reqStatus);
            this._callProtocolErrorHandlers(req);
            if (reqStatus >= 400 && reqStatus < 500) {
                this._conn._changeConnectStatus(Strophe.Status.DISCONNECTING, null);
                this._conn._doDisconnect();
            }
        } else {
            Strophe.error("request id "+req.id+"."+req.sends+" error "+reqStatus+" happened");
        }

        if (!valid_request && !too_many_retries) {
            this._throttledRequestHandler();
        } else if (too_many_retries && !this._conn.connected) {
            this._conn._changeConnectStatus(Strophe.Status.CONNFAIL, "giving-up");
        }
    },

    /** 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 = this._getRequestStatus(req, -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);
                if (typeof req.xhr.setRequestHeader !== 'undefined') {
                    // IE9 doesn't have setRequestHeader
                    req.xhr.setRequestHeader("Content-Type", contentType);
                }
                if (this._conn.options.withCredentials) {
                    req.xhr.withCredentials = true;
                }
            } catch (e2) {
                Strophe.error("XHR open failed: " + e2.toString());
                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;
                setTimeout(function() {
                    // XXX: setTimeout should be called only with function expressions (23974bc1)
                    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 if (typeof exports === 'object') {
        var core = require('./core');

        module.exports = 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 += " - " + text;
        }

        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.tree());
            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.onerror = null;
            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(e) {
        if(this._conn.connected && !this._conn.disconnecting) {
            Strophe.error("Websocket closed unexpectedly");
            this._conn._doDisconnect();
        } else if (e && e.code === 1006 && !this._conn.connected && this.socket) {
            // in case the onError callback was not called (Safari 10 does not
            // call onerror when the initial connection fails) we need to
            // dispatch a CONNFAIL status update to be consistent with the
            // behavior on other browsers.
            Strophe.error("Websocket closed unexcectedly");
            this._conn._changeConnectStatus(
                Strophe.Status.CONNFAIL,
                "The WebSocket connection could not be established or was disconnected."
            );
            this._conn._doDisconnect();
        } else {
            Strophe.info("Websocket closed");
        }
    },

    /** 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) {
        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;
        });
    } else if (typeof exports === 'object') {
        var core = require('./core');
        require('./bosh');
        require('./websocket');
        module.exports = core;
    }
})(this);


require(["strophe-polyfill"]);
/* jshint ignore:start */
    //The modules for your project will be inlined above
    //this snippet. Ask almond to synchronously require the
    //module value for 'main' here and return it as the
    //value to use for the public API for the built file.
    return require('strophe');
}));
/* jshint ignore:end */