RISCI_ATOM
/
synapse
mirror of https://github.com/matrix-org/synapse.git


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

    Copyright 2006-2008, OGG, LLC
*/

/* jslint configuration: */
/*global document, window, setTimeout, clearTimeout, console,
    XMLHttpRequest, ActiveXObject,
    Base64, MD5,
    Strophe, $build, $msg, $iq, $pres */

/** File: strophe.js
 *  A JavaScript library for XMPP BOSH.
 *
 *  This is the JavaScript version of the Strophe library.  Since JavaScript
 *  has no facilities for persistent TCP connections, this library uses
 *  Bidirectional-streams Over Synchronous HTTP (BOSH) to emulate
 *  a persistent, stateful, two-way connection to an XMPP server.  More
 *  information on BOSH can be found in XEP 124.
 */

/** PrivateFunction: Function.prototype.bind
 *  Bind a function to an instance.
 *
 *  This Function object extension method creates a bound method similar
 *  to those in Python.  This means that the 'this' object will point
 *  to the instance you want.  See
 *  <a href='https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind'>MDC's bind() documentation</a> and 
 *  <a href='http://benjamin.smedbergs.us/blog/2007-01-03/bound-functions-and-function-imports-in-javascript/'>Bound Functions and Function Imports in JavaScript</a>
 *  for a complete explanation.
 *
 *  This extension already exists in some browsers (namely, Firefox 3), but
 *  we provide it to support those that don't.
 *
 *  Parameters:
 *    (Object) obj - The object that will become 'this' in the bound function.
 *    (Object) argN - An option argument that will be prepended to the 
 *      arguments given for the function call
 *
 *  Returns:
 *    The bound function.
 */

/* Make it work on node.js: Nodify
 *
 * Steps:
 * 1. Create the global objects: window, document, Base64, MD5 and XMLHttpRequest
 * 2. Use the node-XMLHttpRequest module.
 * 3. Use jsdom for the document object - since it supports DOM functions.
 * 4. Replace all calls to childNodes with _childNodes (since the former doesn't
 *    seem to work on jsdom).
 * 5. While getting the response from XMLHttpRequest, manually convert the text
 *    data to XML.
 * 6. All calls to nodeName should replaced by nodeName.toLowerCase() since jsdom
 *    seems to always convert node names to upper case.
 *
 */
var XMLHttpRequest = require('./XMLHttpRequest.js').XMLHttpRequest;
var Base64         = require('./base64.js').Base64;
var MD5            = require('./md5.js').MD5;
var jsdom          = require("jsdom").jsdom;

document = jsdom("<html><head></head><body></body></html>"),

window = {
    XMLHttpRequest: XMLHttpRequest, 
    Base64: Base64, 
    MD5: MD5
};

exports.Strophe = window;

if (!Function.prototype.bind) {
    Function.prototype.bind = function (obj /*, arg1, arg2, ... */)
    {
        var func = this;
        var _slice = Array.prototype.slice;
        var _concat = Array.prototype.concat;
        var _args = _slice.call(arguments, 1);
        
        return function () {
            return func.apply(obj ? obj : this,
                              _concat.call(_args,
                                           _slice.call(arguments, 0)));
        };
    };
}

/** PrivateFunction: Array.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;
    };
}

/* 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.
 */

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

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

    /** 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: {
        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",
        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"
    },

    /** 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;
    },

    /** 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: {
        ERROR: 0,
        CONNECTING: 1,
        CONNFAIL: 2,
        AUTHENTICATING: 3,
        AUTHFAIL: 4,
        CONNECTED: 5,
        DISCONNECTED: 6,
        DISCONNECTING: 7,
        ATTACHED: 8
    },

    /** 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: {
        NORMAL: 1,
        TEXT: 3
    },

    /** 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: 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 insensitive.
     *
     *  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.toLowerCase() == name.toLowerCase();
    },

    /** 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;

        if (window.ActiveXObject) {
            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++) {
            if (!arguments[a]) { continue; }
            if (typeof(arguments[a]) == "string" ||
                typeof(arguments[a]) == "number") {
                node.appendChild(Strophe.xmlTextNode(arguments[a]));
            } else if (typeof(arguments[a]) == "object" &&
                       typeof(arguments[a].sort) == "function") {
                for (i = 0; i < arguments[a].length; i++) {
                    if (typeof(arguments[a][i]) == "object" &&
                        typeof(arguments[a][i].sort) == "function") {
                        node.setAttribute(arguments[a][i][0],
                                          arguments[a][i][1]);
                    }
                }
            } else if (typeof(arguments[a]) == "object") {
                for (k in arguments[a]) {
                    if (arguments[a].hasOwnProperty(k)) {
                        node.setAttribute(k, arguments[a][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;");
        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)
    {
	//ensure text is escaped
	text = Strophe.xmlescape(text);

        return Strophe.xmlGenerator().createTextNode(text);
    },

    /** 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 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.toLowerCase(),
                                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.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)
    {
        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)
    {
        return node.replace(/\\20/g, " ")
            .replace(/\\22/g, '"')
            .replace(/\\26/g, "&")
            .replace(/\\27/g, "'")
            .replace(/\\2f/g, "/")
            .replace(/\\3a/g, ":")
            .replace(/\\3c/g, "<")
            .replace(/\\3e/g, ">")
            .replace(/\\40/g, "@")
            .replace(/\\5c/g, "\\");
    },

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

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

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

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

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

    /** 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.toLowerCase();
        var i, child;

        if (elem.getAttribute("_realname")) {
            nodeName = elem.getAttribute("_realname").toLowerCase();
        }

        result = "<" + nodeName.toLowerCase();
        for (i = 0; i < elem.attributes.length; i++) {
               if(elem.attributes[i].nodeName.toLowerCase() != "_realname") {
                 result += " " + elem.attributes[i].nodeName.toLowerCase() +
                "='" + elem.attributes[i].value
                    .replace(/&/g, "&amp;")
                       .replace(/\'/g, "&apos;")
                       .replace(/</g, "&lt;") + "'";
               }
        }

        if (elem._childNodes.length > 0) {
            result += ">";
            for (i = 0; i < elem._childNodes.length; i++) {
                child = elem._childNodes[i];
                if (child.nodeType == Strophe.ElementType.NORMAL) {
                    // normal element, so recurse
                    result += Strophe.serialize(child);
                } else if (child.nodeType == Strophe.ElementType.TEXT) {
                    // text element
                    result += child.nodeValue;
                }
            }
            result += "</" + nodeName.toLowerCase() + ">";
        } 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.
     *
     *  Paramaters:
     *    (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 element easily and rapidly.  All the functions except for toString()
 *  and tree() return the object, so calls can be chained.  Here's an
 *  example using the $iq() builder helper.
 *  > $iq({to: 'you', from: 'me', type: 'get', id: '1'})
 *  >     .c('query', {xmlns: 'strophe:example'})
 *  >     .c('example')
 *  >     .toString()
 *  The above generates this XML fragment
 *  > <iq to='you' from='me' type='get' id='1'>
 *  >   <query xmlns='strophe:example'>
 *  >     <example/>
 *  >   </query>
 *  > </iq>
 *  The corresponding DOM manipulations to get a similar fragment would be
 *  a lot more tedious and probably involve several helper variables.
 *
 *  Since adding children makes new operations operate on the child, up()
 *  is provided to traverse up the tree.  To add two children, do
 *  > builder.c('child1', ...).up().c('child2', ...)
 *  The next operation on the Builder will be relative to the second child.
 */

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

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

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

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

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

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

    /** Function: attrs
     *  Add or modify attributes of the current element.
     *
     *  The attributes should be passed in object notation.  This function
     *  does not move the current element pointer.
     *
     *  Parameters:
     *    (Object) moreattrs - The attributes to add/modify in object notation.
     *
     *  Returns:
     *    The Strophe.Builder object.
     */
    attrs: function (moreattrs)
    {
        for (var k in moreattrs) {
            if (moreattrs.hasOwnProperty(k)) {
                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.  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.
     *
     *  Returns:
     *    The Strophe.Builder object.
     */
    c: function (name, attrs)
    {
        var child = Strophe.xmlElement(name, attrs);
        this.node.appendChild(child);
        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 xmlGen = Strophe.xmlGenerator();
        var newElem = xmlGen.importNode ? 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;
    }
};


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

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

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

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

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

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

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

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

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

        if (nsMatch &&
            (!this.name || Strophe.isTagEqual(elem, this.name)) &&
            (!this.type || elem.getAttribute("type") == this.type) &&
            (!this.id || elem.getAttribute("id") == this.id) &&
            (!this.from || from == this.from)) {
                return true;
        }

        return false;
    },

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

            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 +")}";
    }
};

/** 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.
     *
     *  Returns:
     *    The DOM element tree of the response.
     */
    getResponse: function ()
    {
		// console.log("getResponse:", this.xhr.responseXML, ":", this.xhr.responseText);

        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) {
			// Hack for node.
			var _div = document.createElement("div");
			_div.innerHTML = this.xhr.responseText;
			node = _div._childNodes[0];

            Strophe.error("invalid response received");
            Strophe.error("responseText: " + this.xhr.responseText);
            Strophe.error("responseXML: " +
                          Strophe.serialize(this.xhr.responseXML));
        }

        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");
            }
        } 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.Connection
 *  XMPP Connection manager.
 *
 *  Thie class is the main part of Strophe.  It manages a BOSH connection
 *  to an XMPP server and dispatches events to the user callbacks as
 *  data arrives.  It supports SASL PLAIN, SASL DIGEST-MD5, 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.
 *
 *  Parameters:
 *    (String) service - The BOSH service URL.
 *
 *  Returns:
 *    A new Strophe.Connection object.
 */
Strophe.Connection = function (service)
{
    /* The path to the httpbind service. */
    this.service = service;
    /* The connected JID. */
    this.jid = "";
    /* request id for body tags */
    this.rid = Math.floor(Math.random() * 4294967295);
    /* The current session ID. */
    this.sid = null;
    this.streamId = null;
    /* stream:features */
    this.features = null;

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

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

    this._idleTimeout = null;
    this._disconnectTimeout = null;

    this.authenticated = false;
    this.disconnecting = false;
    this.connected = false;

    this.errors = 0;

    this.paused = false;

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

    this._data = [];
    this._requests = [];
    this._uniqueId = Math.round(Math.random() * 10000);

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

    // setup onIdle callback every 1/10th of a second
    this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);

    // 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 () {};
            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.rid = Math.floor(Math.random() * 4294967295);

        this.sid = null;
        this.streamId = null;

        // 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.disconnecting = false;
        this.connected = false;

        this.errors = 0;

        this._requests = [];
        this._uniqueId = Math.round(Math.random()*10000);
    },

    /** 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 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)
    {
        if (typeof(suffix) == "string" || typeof(suffix) == "number") {
            return ++this._uniqueId + ":" + suffix;
        } else {
            return ++this._uniqueId + "";
        }
    },

    /** 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'.
     *
     *  Please see XEP 124 for a more detailed explanation of the optional
     *  parameters below.
     *
     *  Parameters:
     *    (String) jid - The user's JID.  This may be a bare JID,
     *      or a full JID.  If a node is not supplied, SASL ANONYMOUS
     *      authentication will be attempted.
     *    (String) pass - The user's password.
     *    (Function) callback The connect callback function.
     *    (Integer) wait - The optional HTTPBIND wait value.  This is the
     *      time the server will wait before returning an empty result for
     *      a request.  The default setting of 60 seconds is recommended.
     *      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).
     */
    connect: function (jid, pass, callback, wait, hold, route)
    {
        this.jid = jid;
        this.pass = pass;
        this.connect_callback = callback;
        this.disconnecting = false;
        this.connected = false;
        this.authenticated = false;
        this.errors = 0;

        this.wait = wait || this.wait;
        this.hold = hold || this.hold;

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

        // build the body tag
		var body_attrs = {
            to: this.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 body = this._buildBody().attrs(body_attrs);

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

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

    /** 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)
    {
        this.jid = jid;
        this.sid = sid;
        this.rid = rid;
        this.connect_callback = callback;

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

        this.authenticated = true;
        this.connected = true;

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

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

    /** 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)
     *  > };
     *
     *  Parameters:
     *    (XMLElement) elem - The XML data received by the connection.
     */
    xmlInput: function (elem)
    {
        return;
    },

    /** 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)
     *  > };
     *
     *  Parameters:
     *    (XMLElement) elem - The XMLdata sent by the connection.
     */
    xmlOutput: function (elem)
    {
        return;
    },

    /** 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.
     */
    rawInput: function (data)
    {
        return;
    },

    /** 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.
     */
    rawOutput: function (data)
    {
        return;
    },

    /** 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._throttledRequestHandler();
        clearTimeout(this._idleTimeout);
        this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);
    },

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

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

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

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

	var 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', null, id);

	// if timeout specified, setup timeout handler.
	if (timeout) {
	    timeoutHandler = this.addTimedHandler(timeout, function () {
                // get rid of normal handler
                that.deleteHandler(handler);

	        // call errback on timeout with null stanza
                if (errback) {
		    errback(null);
                }
		return false;
	    });
	}

	this.send(elem);

	return id;
    },

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

        this._data.push(element);
    },

    /** PrivateFunction: _sendRestart
     *  Send an xmpp:restart stanza.
     */
    _sendRestart: function ()
    {
        this._data.push("restart");

        this._throttledRequestHandler();
        clearTimeout(this._idleTimeout);
        this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);
    },

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

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

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

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

    /** 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.
     *
     *  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) {
            // setup timeout handler
            this._disconnectTimeout = this._addSysTimedHandler(
                3000, this._onDisconnectTimeout.bind(this));
            this._sendTerminate();
        }
    },

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

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

    /** PrivateFunction: _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});
        }

        return bodyWrap;
    },

    /** 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: _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 req = this._requests[i];
        var reqStatus = -1;

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

        if (typeof(reqStatus) == "undefined") {
            reqStatus = -1;
        }

        // make sure we limit the number of retries
        if (req.sends > 5) {
            this._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");

            req.date = new Date();
            try {
                req.xhr.open("POST", this.service, true);
            } catch (e2) {
                Strophe.error("XHR open failed.");
                if (!this.connected) {
                    this._changeConnectStatus(Strophe.Status.CONNFAIL,
                                              "bad-service");
                }
                this.disconnect();
                return;
            }

            // Fires the XHR request -- may be invoked immediately
            // or on a gradually expanding retry window for reconnects
            var sendFunc = function () {
                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 creats a nicely
                // expanding retry window
                var backoff = Math.pow(req.sends, 3) * 1000;
                setTimeout(sendFunc, backoff);
            } else {
                sendFunc();
            }

            req.sends++;

            this.xmlOutput(req.xmlData);
            this.rawOutput(req.data);
        } else {
            Strophe.debug("_processRequest: " +
                          (i === 0 ? "first" : "second") +
                          " request has readyState of " +
                          req.xhr.readyState);
        }
    },

    /** 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);
        }
    },

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

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

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

            if (typeof(reqStatus) == "undefined") {
                reqStatus = 0;
            }

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

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

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

            // request succeeded
            if (reqStatus == 200) {
                // if request 1 finished, or request 0 finished and request
                // 1 is over Strophe.SECONDARY_TIMEOUT seconds old, we need to
                // restart the other - both will be in the first spot, as the
                // completed request has been removed from the queue already
                if (reqIs1 ||
                    (reqIs0 && this._requests.length > 0 &&
                     this._requests[0].age() > Math.floor(Strophe.SECONDARY_TIMEOUT * this.wait))) {
                    this._restartRequest(0);
                }
                // call handler
                Strophe.debug("request id " +
                              req.id + "." +
                              req.sends + " got 200");
                func(req);
                this.errors = 0;
            } else {
                Strophe.error("request id " +
                              req.id + "." +
                              req.sends + " error " + reqStatus +
                              " happened");
                if (reqStatus === 0 ||
                    (reqStatus >= 400 && reqStatus < 600) ||
                    reqStatus >= 12000) {
                    this._hitError(reqStatus);
                    if (reqStatus >= 400 && reqStatus < 500) {
                        this._changeConnectStatus(Strophe.Status.DISCONNECTING,
                                                  null);
                        this._doDisconnect();
                    }
                }
            }

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

    /** 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._onDisconnectTimeout();
        }
    },

    /** 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 ()
    {
        Strophe.info("_doDisconnect was called");
        this.authenticated = false;
        this.disconnecting = false;
        this.sid = null;
        this.streamId = null;
        this.rid = Math.floor(Math.random() * 4294967295);

        // tell the parent we disconnected
        if (this.connected) {
            this._changeConnectStatus(Strophe.Status.DISCONNECTED, null);
            this.connected = false;
        }

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

    /** 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.
     */
    _dataRecv: function (req)
    {
        try {
            var elem = req.getResponse();
        } catch (e) {
            if (e != "parsererror") { throw e; }
            this.disconnect("strophe-parsererror");
        }
        if (elem === null) { return; }

        this.xmlInput(elem);
        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._requests.length === 0) {
            this.deleteTimedHandler(this._disconnectTimeout);
            this._disconnectTimeout = null;
            this._doDisconnect();
            return;
        }

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

            // an error occurred
            cond = elem.getAttribute("condition");
            conflict = elem.getElementsByTagName("conflict");
            if (cond !== null) {
                if (cond == "remote-stream-error" && conflict.length > 0) {
                    cond = "conflict";
                }
                this._changeConnectStatus(Strophe.Status.CONNFAIL, cond);
            } else {
                this._changeConnectStatus(Strophe.Status.CONNFAIL, "unknown");
            }
            this.disconnect();
            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];
                if (hand.isMatch(child) &&
                    (that.authenticated || !hand.user)) {
                    if (hand.run(child)) {
                        that.handlers.push(hand);
                    }
                } else {
                    that.handlers.push(hand);
                }
            }
        });
    },

    /** 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 ()
    {
        Strophe.info("_sendTerminate was called");
        var body = this._buildBody().attrs({type: "terminate"});

        if (this.authenticated) {
            body.c('presence', {
                xmlns: Strophe.NS.CLIENT,
                type: 'unavailable'
            });
        }

        this.disconnecting = true;

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

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

    /** 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.
     */
    _connect_cb: function (req)
    {
        Strophe.info("_connect_cb was called");

        this.connected = true;
        var bodyWrap = req.getResponse();
        if (!bodyWrap) { return; }

        this.xmlInput(bodyWrap);
        this.rawInput(Strophe.serialize(bodyWrap));

        var typ = bodyWrap.getAttribute("type");
        var cond, conflict;
        if (typ !== null && typ == "terminate") {
            // an error occurred
            cond = bodyWrap.getAttribute("condition");
            conflict = bodyWrap.getElementsByTagName("conflict");
            if (cond !== null) {
                if (cond == "remote-stream-error" && conflict.length > 0) {
                    cond = "conflict";
                }
                this._changeConnectStatus(Strophe.Status.CONNFAIL, cond);
            } else {
                this._changeConnectStatus(Strophe.Status.CONNFAIL, "unknown");
            }
            return;
        }

        // 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");
        }
        if (!this.stream_id) {
            this.stream_id = bodyWrap.getAttribute("authid");
        }
        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 do_sasl_plain = false;
        var do_sasl_digest_md5 = false;
        var do_sasl_anonymous = false;

        var mechanisms = bodyWrap.getElementsByTagName("mechanism");
        var i, mech, auth_str, hashed_auth_str;
        if (mechanisms.length > 0) {
            for (i = 0; i < mechanisms.length; i++) {
                mech = Strophe.getText(mechanisms[i]);
                if (mech == 'DIGEST-MD5') {
                    do_sasl_digest_md5 = true;
                } else if (mech == 'PLAIN') {
                    do_sasl_plain = true;
                } else if (mech == 'ANONYMOUS') {
                    do_sasl_anonymous = true;
                }
            }
        } else {
            // we didn't get stream:features yet, so we need wait for it
            // by sending a blank poll request
            var body = this._buildBody();
            this._requests.push(
                new Strophe.Request(body.tree(),
                                    this._onRequestStateChange.bind(
                                        this, this._connect_cb.bind(this)),
                                    body.tree().getAttribute("rid")));
            this._throttledRequestHandler();
            return;
        }

        if (Strophe.getNodeFromJid(this.jid) === null &&
            do_sasl_anonymous) {
            this._changeConnectStatus(Strophe.Status.AUTHENTICATING, null);
            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.send($build("auth", {
                xmlns: Strophe.NS.SASL,
                mechanism: "ANONYMOUS"
            }).tree());
        } else if (Strophe.getNodeFromJid(this.jid) === null) {
            // we don't have a node, which is required for non-anonymous
            // client connections
            this._changeConnectStatus(Strophe.Status.CONNFAIL,
                                      'x-strophe-bad-non-anon-jid');
            this.disconnect();
        } else if (do_sasl_digest_md5) {
            this._changeConnectStatus(Strophe.Status.AUTHENTICATING, null);
            this._sasl_challenge_handler = this._addSysHandler(
                this._sasl_challenge1_cb.bind(this), null,
                "challenge", null, null);
            this._sasl_failure_handler = this._addSysHandler(
                this._sasl_failure_cb.bind(this), null,
                "failure", null, null);

            this.send($build("auth", {
                xmlns: Strophe.NS.SASL,
                mechanism: "DIGEST-MD5"
            }).tree());
        } else if (do_sasl_plain) {
            // Build the plain auth string (barejid null
            // username null password) and base 64 encoded.
            auth_str = Strophe.getBareJidFromJid(this.jid);
            auth_str = auth_str + "\u0000";
            auth_str = auth_str + Strophe.getNodeFromJid(this.jid);
            auth_str = auth_str + "\u0000";
            auth_str = auth_str + this.pass;

            this._changeConnectStatus(Strophe.Status.AUTHENTICATING, null);
            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);

            hashed_auth_str = Base64.encode(auth_str);
            this.send($build("auth", {
                xmlns: Strophe.NS.SASL,
                mechanism: "PLAIN"
            }).t(hashed_auth_str).tree());
        } else {
            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());
        }
    },

    /** PrivateFunction: _sasl_challenge1_cb
     *  _Private_ handler for DIGEST-MD5 SASL authentication.
     *
     *  Parameters:
     *    (XMLElement) elem - The challenge stanza.
     *
     *  Returns:
     *    false to remove the handler.
     */
    _sasl_challenge1_cb: function (elem)
    {
        var attribMatch = /([a-z]+)=("[^"]+"|[^,"]+)(?:,|$)/;

        var challenge = Base64.decode(Strophe.getText(elem));
        var cnonce = MD5.hexdigest(Math.random() * 1234567890);
        var realm = "";
        var host = null;
        var nonce = "";
        var qop = "";
        var matches;

        // remove unneeded handlers
        this.deleteHandler(this._sasl_failure_handler);

        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 = "xmpp/" + this.domain;
        if (host !== null) {
            digest_uri = digest_uri + "/" + host;
        }

        var A1 = MD5.hash(Strophe.getNodeFromJid(this.jid) +
                          ":" + realm + ":" + this.pass) +
            ":" + nonce + ":" + cnonce;
        var A2 = 'AUTHENTICATE:' + digest_uri;

        var responseText = "";
        responseText += 'username=' +
            this._quote(Strophe.getNodeFromJid(this.jid)) + ',';
        responseText += 'realm=' + this._quote(realm) + ',';
        responseText += 'nonce=' + this._quote(nonce) + ',';
        responseText += 'cnonce=' + this._quote(cnonce) + ',';
        responseText += 'nc="00000001",';
        responseText += 'qop="auth",';
        responseText += 'digest-uri=' + this._quote(digest_uri) + ',';
        responseText += 'response=' + this._quote(
            MD5.hexdigest(MD5.hexdigest(A1) + ":" +
                          nonce + ":00000001:" +
                          cnonce + ":auth:" +
                          MD5.hexdigest(A2))) + ',';
        responseText += 'charset="utf-8"';

        this._sasl_challenge_handler = this._addSysHandler(
            this._sasl_challenge2_cb.bind(this), null,
            "challenge", null, null);
        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.send($build('response', {
            xmlns: Strophe.NS.SASL
        }).t(Base64.encode(responseText)).tree());

        return false;
    },

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


    /** PrivateFunction: _sasl_challenge2_cb
     *  _Private_ handler for second step of DIGEST-MD5 SASL authentication.
     *
     *  Parameters:
     *    (XMLElement) elem - The challenge stanza.
     *
     *  Returns:
     *    false to remove the handler.
     */
    _sasl_challenge2_cb: function (elem)
    {
        // remove unneeded handlers
        this.deleteHandler(this._sasl_success_handler);
        this.deleteHandler(this._sasl_failure_handler);

        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.send($build('response', {xmlns: Strophe.NS.SASL}).tree());
        return false;
    },

    /** 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.
     */
    _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;
    },

    /** 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)
    {
        Strophe.info("SASL authentication succeeded.");

        // 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._addSysHandler(this._sasl_auth1_cb.bind(this), null,
                            "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.toLowerCase() == 'bind') {
                this.do_bind = true;
            }

            if (child.nodeName.toLowerCase() == '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.");
            this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
            return false;
        }

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

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

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

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

        return false;
    },

    /** PrivateFunction: _sasl_failure_cb
     *  _Private_ handler for SASL authentication failure.
     *
     *  Parameters:
     *    (XMLElement) elem - The matching stanza.
     *
     *  Returns:
     *    false to remove the handler.
     */
    _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;
        }

        this._changeConnectStatus(Strophe.Status.AUTHFAIL, null);
        return false;
    },

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

        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");

        // cancel all remaining requests and clear the queue
        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 () {};
        }

        // 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;

        var body, time_elapsed;

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

        if (this._requests.length < 2 && this._data.length > 0 &&
            !this.paused) {
            body = this._buildBody();
            for (i = 0; i < this._data.length; i++) {
                if (this._data[i] !== null) {
                    if (this._data[i] === "restart") {
                        body.attrs({
                            to: this.domain,
                            "xml:lang": "en",
                            "xmpp:restart": "true",
                            "xmlns:xmpp": Strophe.NS.BOSH
                        });
                    } else {
                        body.cnode(this._data[i]).up();
                    }
                }
            }
            delete this._data;
            this._data = [];
            this._requests.push(
                new Strophe.Request(body.tree(),
                                    this._onRequestStateChange.bind(
                                        this, this._dataRecv.bind(this)),
                                    body.tree().getAttribute("rid")));
            this._processRequest(this._requests.length - 1);
        }

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

        // reactivate the timer
        clearTimeout(this._idleTimeout);
        this._idleTimeout = setTimeout(this._onIdle.bind(this), 100);
    }
};

if (callback) {
    callback(Strophe, $build, $msg, $iq, $pres);
}

})(function () {
    window.Strophe = arguments[0];
    window.$build = arguments[1];
    window.$msg = arguments[2];
    window.$iq = arguments[3];
    window.$pres = arguments[4];
});