xmpp.chapril.org-conversejs/converse.js

/*!
 * Converse.js (Web-based XMPP instant messaging client)
 * http://conversejs.org
 *
 * Copyright (c) 2012, Jan-Carel Brand <jc@opkode.com>
 * Dual licensed under the MIT and GPL Licenses
 */

// AMD/global registrations
(function (root, factory) {
    if (typeof console === "undefined" || typeof console.log === "undefined") {
        console = { log: function () {}, error: function () {} };
    }
    if (typeof define === 'function' && define.amd) {
        define("converse", ["converse-dependencies"], function(otr) {
            // Use Mustache style syntax for variable interpolation
            _.templateSettings = {
                evaluate : /\{\[([\s\S]+?)\]\}/g,
                interpolate : /\{\{([\s\S]+?)\}\}/g
            };
            if (typeof otr !== "undefined") {
                return factory(jQuery, _, otr.OTR, otr.DSA, console);
            } else {
                return factory(jQuery, _, undefined, undefined, console);
            }
        });
    } else {
        // Browser globals
        _.templateSettings = {
            evaluate : /\{\[([\s\S]+?)\]\}/g,
            interpolate : /\{\{([\s\S]+?)\}\}/g
        };
        if ((typeof OTR !== "undefined") && (typeof DSA !== "undefined")) {
            root.converse = factory(jQuery, _, OTR, DSA, console);
        } else {
            root.converse = factory(jQuery, _, undefined, undefined, console);
        }
    }
}(this, function ($, _, OTR, DSA, console) {
    $.fn.addHyperlinks = function() {
        if (this.length > 0) {
            this.each(function(i, obj) {
                var x = $(obj).html();
                var list = x.match(/\b(https?:\/\/|www\.|https?:\/\/www\.)[^\s<]{2,200}\b/g );
                if (list) {
                    for (i=0; i<list.length; i++) {
                        var prot = list[i].indexOf('http://') === 0 || list[i].indexOf('https://') === 0 ? '' : 'http://';
                        var escaped_url = encodeURI(decodeURI(list[i])).replace(/[!'()]/g, escape).replace(/\*/g, "%2A");
                        x = x.replace(list[i], "<a target='_blank' href='" + prot + escaped_url + "'>"+ list[i] + "</a>" );
                    }
                }
                $(obj).html(x);
            });
        }
        return this;
    };

    $.fn.addEmoticons = function() {
        if (converse.show_emoticons) {
            if (this.length > 0) {
                this.each(function(i, obj) {
                    var text = $(obj).html();
                    text = text.replace(/:\)/g, '<span class="emoticon icon-smiley"></span>');
                    text = text.replace(/:\-\)/g, '<span class="emoticon icon-smiley"></span>');
                    text = text.replace(/;\)/g, '<span class="emoticon icon-wink"></span>');
                    text = text.replace(/;\-\)/g, '<span class="emoticon icon-wink"></span>');
                    text = text.replace(/:D/g, '<span class="emoticon icon-grin"></span>');
                    text = text.replace(/:\-D/g, '<span class="emoticon icon-grin"></span>');
                    text = text.replace(/:P/g, '<span class="emoticon icon-tongue"></span>');
                    text = text.replace(/:\-P/g, '<span class="emoticon icon-tongue"></span>');
                    text = text.replace(/:p/g, '<span class="emoticon icon-tongue"></span>');
                    text = text.replace(/:\-p/g, '<span class="emoticon icon-tongue"></span>');
                    text = text.replace(/8\)/g, '<span class="emoticon icon-cool"></span>');
                    text = text.replace(/&gt;:\)/g, '<span class="emoticon icon-evil"></span>');
                    text = text.replace(/:S/g, '<span class="emoticon icon-confused"></span>');
                    text = text.replace(/:\\/g, '<span class="emoticon icon-wondering"></span>');
                    text = text.replace(/:\/ /g, '<span class="emoticon icon-wondering"></span>');
                    text = text.replace(/&gt;:\(/g, '<span class="emoticon icon-angry"></span>');
                    text = text.replace(/:\(/g, '<span class="emoticon icon-sad"></span>');
                    text = text.replace(/:\-\(/g, '<span class="emoticon icon-sad"></span>');
                    text = text.replace(/:O/g, '<span class="emoticon icon-shocked"></span>');
                    text = text.replace(/:\-O/g, '<span class="emoticon icon-shocked"></span>');
                    text = text.replace(/\=\-O/g, '<span class="emoticon icon-shocked"></span>');
                    text = text.replace(/\(\^.\^\)b/g, '<span class="emoticon icon-thumbs-up"></span>');
                    text = text.replace(/<3/g, '<span class="emoticon icon-heart"></span>');
                    $(obj).html(text);
                });
            }
        }
        return this;
    };

    var converse = {
        emit: function(evt, data) {
            $(this).trigger(evt, data);
        },
        once: function(evt, handler) {
            $(this).one(evt, handler);
        },
        on: function(evt, handler) {
            $(this).bind(evt, handler);
        },
        off: function(evt, handler) {
            $(this).unbind(evt, handler);
        }
    };

    converse.initialize = function (settings, callback) {
        var converse = this;

        // Constants
        // ---------
        var UNENCRYPTED = 0;
        var UNVERIFIED= 1;
        var VERIFIED= 2;
        var FINISHED = 3;
        var KEY = {
            ENTER: 13
        };
        var HAS_CSPRNG = ((typeof crypto !== 'undefined') &&
            ((typeof crypto.randomBytes === 'function') ||
                (typeof crypto.getRandomValues === 'function')
        ));
        var HAS_CRYPTO = HAS_CSPRNG && (
            (typeof CryptoJS !== "undefined") &&
            (typeof OTR !== "undefined") &&
            (typeof DSA !== "undefined")
        );

        // Default configuration values
        // ----------------------------
        this.allow_contact_requests = true;
        this.allow_muc = true;
        this.allow_otr = true;
        this.animate = true;
        this.auto_list_rooms = false;
        this.auto_reconnect = true;
        this.auto_subscribe = false;
        this.bosh_service_url = undefined; // The BOSH connection manager URL.
        this.cache_otr_key = false;
        this.debug = false;
        this.expose_rid_and_sid = false;
        this.hide_muc_server = false;
        this.i18n = locales.en;
        this.prebind = false;
        this.show_controlbox_by_default = false;
        this.show_only_online_users = false;
        this.show_call_button = false;
        this.show_emoticons = true;
        this.show_toolbar = true;
        this.use_otr_by_default = false;
        this.use_vcards = true;
        this.xhr_custom_status = false;
        this.xhr_custom_status_url = '';
        this.xhr_user_search = false;
        this.xhr_user_search_url = '';

        // Allow only whitelisted configuration attributes to be overwritten
        _.extend(this, _.pick(settings, [
            'allow_contact_requests',
            'allow_muc',
            'allow_otr',
            'animate',
            'auto_list_rooms',
            'auto_reconnect',
            'auto_subscribe',
            'bosh_service_url',
            'cache_otr_key',
            'connection',
            'debug',
            'expose_rid_and_sid',
            'fullname',
            'hide_muc_server',
            'i18n',
            'jid',
            'prebind',
            'rid',
            'show_call_button',
            'show_controlbox_by_default',
            'show_emoticons',
            'show_only_online_users',
            'show_toolbar',
            'sid',
            'use_otr_by_default',
            'use_vcards',
            'xhr_custom_status',
            'xhr_custom_status_url',
            'xhr_user_search',
            'xhr_user_search_url'
        ]));

        // Only allow OTR if we have the capability
        this.allow_otr = this.allow_otr && HAS_CRYPTO;

        // Only use OTR by default if allow OTR is enabled to begin with
        this.use_otr_by_default = this.use_otr_by_default && this.allow_otr;

        // Translation machinery
        // ---------------------
        var __ = $.proxy(function (str) {
            // Translation factory
            if (this.i18n === undefined) {
                this.i18n = locales.en;
            }
            var t = this.i18n.translate(str);
            if (arguments.length>1) {
                return t.fetch.apply(t, [].slice.call(arguments,1));
            } else {
                return t.fetch();
            }
        }, this);

        var ___ = function (str) {
            /* XXX: This is part of a hack to get gettext to scan strings to be
             * translated. Strings we cannot send to the function above because
             * they require variable interpolation and we don't yet have the
             * variables at scan time.
             *
             * See actionInfoMessages
             */
            return str;
        };

        // Translation aware constants
        // ---------------------------
        var OTR_CLASS_MAPPING = {};
        OTR_CLASS_MAPPING[UNENCRYPTED] = 'unencrypted';
        OTR_CLASS_MAPPING[UNVERIFIED] = 'unverified';
        OTR_CLASS_MAPPING[VERIFIED] = 'verified';
        OTR_CLASS_MAPPING[FINISHED] = 'finished';

        var OTR_TRANSLATED_MAPPING  = {};
        OTR_TRANSLATED_MAPPING[UNENCRYPTED] = __('unencrypted');
        OTR_TRANSLATED_MAPPING[UNVERIFIED] = __('unverified');
        OTR_TRANSLATED_MAPPING[VERIFIED] = __('verified');
        OTR_TRANSLATED_MAPPING[FINISHED] = __('finished');

        var STATUSES = {
            'dnd': __('This contact is busy'),
            'online': __('This contact is online'),
            'offline': __('This contact is offline'),
            'unavailable': __('This contact is unavailable'),
            'xa': __('This contact is away for an extended period'),
            'away': __('This contact is away')
        };

        // Module-level variables
        // ----------------------
        this.callback = callback || function () {};
        this.initial_presence_sent = 0;
        this.msg_counter = 0;

        // Module-level functions
        // ----------------------
        this.giveFeedback = function (message, klass) {
            $('.conn-feedback').text(message);
            $('.conn-feedback').attr('class', 'conn-feedback');
            if (klass) {
                $('.conn-feedback').addClass(klass);
            }
        };

        this.log = function (txt, level) {
            if (this.debug) {
                if (level == 'error') {
                    console.log('ERROR: '+txt);
                } else {
                    console.log(txt);
                }
            }
        };

        this.getVCard = function (jid, callback, errback) {
            if (!this.use_vcards) {
                if (callback) {
                    callback(jid, jid);
                }
                return;
            }
            converse.connection.vcard.get(
                $.proxy(function (iq) {
                    // Successful callback
                    var $vcard = $(iq).find('vCard');
                    var fullname = $vcard.find('FN').text(),
                        img = $vcard.find('BINVAL').text(),
                        img_type = $vcard.find('TYPE').text(),
                        url = $vcard.find('URL').text();
                    if (jid) {
                        var rosteritem = converse.roster.get(jid);
                        if (rosteritem) {
                            fullname = _.isEmpty(fullname)? rosteritem.get('fullname') || jid: fullname;
                            rosteritem.save({
                                'fullname': fullname,
                                'image_type': img_type,
                                'image': img,
                                'url': url,
                                'vcard_updated': converse.toISOString(new Date())
                            });
                        }
                    }
                    if (callback) {
                        callback(jid, fullname, img, img_type, url);
                    }
                }, this),
                jid,
                function (iq) {
                    // Error callback
                    var rosteritem = converse.roster.get(jid);
                    if (rosteritem) {
                        rosteritem.save({
                            'vcard_updated': converse.toISOString(new Date())
                        });
                    }
                    if (errback) {
                        errback(iq);
                    }
                }
            );
        };

        this.reconnect = function () {
            converse.giveFeedback(__('Reconnecting'), 'error');
            if (!converse.prebind) {
                this.connection.connect(
                    this.connection.jid,
                    this.connection.pass,
                    function (status, condition) {
                        converse.onConnect(status, condition, true);
                    },
                    this.connection.wait,
                    this.connection.hold,
                    this.connection.route
                );
            }
        };

        this.showLoginButton = function () {
            var view = converse.chatboxesview.views.controlbox;
            if (typeof view.loginpanel !== 'undefined') {
                view.loginpanel.showLoginButton();
            }
        };

        this.onConnect = function (status, condition, reconnect) {
            var $button, $form;
            if ((status === Strophe.Status.CONNECTED) ||
                (status === Strophe.Status.ATTACHED)) {
                if ((typeof reconnect !== 'undefined') && (reconnect)) {
                    converse.log(status === Strophe.Status.CONNECTED ? 'Reconnected' : 'Reattached');
                    converse.onReconnected();
                } else {
                    converse.log(status === Strophe.Status.CONNECTED ? 'Connected' : 'Attached');
                    converse.onConnected();
                }
            } else if (status === Strophe.Status.DISCONNECTED) {
                // TODO: Handle case where user manually logs out...
                converse.giveFeedback(__('Disconnected'), 'error');
                if (converse.auto_reconnect) {
                    converse.reconnect();
                } else {
                    converse.showLoginButton();
                }
            } else if (status === Strophe.Status.Error) {
                converse.showLoginButton();
                converse.giveFeedback(__('Error'), 'error');
            } else if (status === Strophe.Status.CONNECTING) {
                converse.giveFeedback(__('Connecting'));
            } else if (status === Strophe.Status.CONNFAIL) {
                converse.showLoginButton();
                converse.giveFeedback(__('Connection Failed'), 'error');
            } else if (status === Strophe.Status.AUTHENTICATING) {
                converse.giveFeedback(__('Authenticating'));
            } else if (status === Strophe.Status.AUTHFAIL) {
                converse.showLoginButton();
                converse.giveFeedback(__('Authentication Failed'), 'error');
            } else if (status === Strophe.Status.DISCONNECTING) {
                converse.giveFeedback(__('Disconnecting'), 'error');
            }
        };

        this.toISOString = function (date) {
            var pad;
            if (typeof date.toISOString !== 'undefined') {
                return date.toISOString();
            } else {
                // IE <= 8 Doesn't have toISOStringMethod
                pad = function (num) {
                    return (num < 10) ? '0' + num : '' + num;
                };
                return date.getUTCFullYear() + '-' +
                    pad(date.getUTCMonth() + 1) + '-' +
                    pad(date.getUTCDate()) + 'T' +
                    pad(date.getUTCHours()) + ':' +
                    pad(date.getUTCMinutes()) + ':' +
                    pad(date.getUTCSeconds()) + '.000Z';
            }
        };

        this.parseISO8601 = function (datestr) {
            /* Parses string formatted as 2013-02-14T11:27:08.268Z to a Date obj.
            */
            var numericKeys = [1, 4, 5, 6, 7, 10, 11],
                struct = /^\s*(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}\.?\d*)Z\s*$/.exec(datestr),
                minutesOffset = 0,
                i, k;

            for (i = 0; (k = numericKeys[i]); ++i) {
                struct[k] = +struct[k] || 0;
            }
            // allow undefined days and months
            struct[2] = (+struct[2] || 1) - 1;
            struct[3] = +struct[3] || 1;
            if (struct[8] !== 'Z' && struct[9] !== undefined) {
                minutesOffset = struct[10] * 60 + struct[11];

                if (struct[9] === '+') {
                    minutesOffset = 0 - minutesOffset;
                }
            }
            return new Date(Date.UTC(struct[1], struct[2], struct[3], struct[4], struct[5] + minutesOffset, struct[6], struct[7]));
        };

        this.updateMsgCounter = function () {
            if (this.msg_counter > 0) {
                if (document.title.search(/^Messages \(\d+\) /) == -1) {
                    document.title = "Messages (" + this.msg_counter + ") " + document.title;
                } else {
                    document.title = document.title.replace(/^Messages \(\d+\) /, "Messages (" + this.msg_counter + ") ");
                }
                window.blur();
                window.focus();
            } else if (document.title.search(/^Messages \(\d+\) /) != -1) {
                document.title = document.title.replace(/^Messages \(\d+\) /, "");
            }
        };

        this.incrementMsgCounter = function () {
            this.msg_counter += 1;
            this.updateMsgCounter();
        };

        this.clearMsgCounter = function () {
            this.msg_counter = 0;
            this.updateMsgCounter();
        };

        this.initStatus = function (callback) {
            this.xmppstatus = new this.XMPPStatus();
            var id = hex_sha1('converse.xmppstatus-'+this.bare_jid);
            this.xmppstatus.id = id; // This appears to be necessary for backbone.localStorage
            this.xmppstatus.localStorage = new Backbone.LocalStorage(id);
            this.xmppstatus.fetch({success: callback, error: callback});
        };

        this.registerRosterHandler = function () {
            // Register handlers that depend on the roster
            this.connection.roster.registerCallback(
                $.proxy(this.roster.rosterHandler, this.roster),
                null, 'presence', null);
        };

        this.registerRosterXHandler = function () {
            this.connection.addHandler(
                $.proxy(this.roster.subscribeToSuggestedItems, this.roster),
                'http://jabber.org/protocol/rosterx', 'message', null);
        };

        this.registerPresenceHandler = function () {
            this.connection.addHandler(
                $.proxy(function (presence) {
                    this.presenceHandler(presence);
                    return true;
                }, this.roster), null, 'presence', null);
        };

        this.initRoster = function () {
            // Set up the roster
            this.roster = new this.RosterItems();
            this.roster.localStorage = new Backbone.LocalStorage(
                hex_sha1('converse.rosteritems-'+converse.bare_jid));
            this.registerRosterHandler();
            this.registerRosterXHandler();
            this.registerPresenceHandler();
            // No create the view which will fetch roster items from
            // localStorage
            this.rosterview = new this.RosterView({'model':this.roster});
        };

        this.registerGlobalEventHandlers = function () {
            $(document).click(function() {
                if ($('.toggle-otr ul').is(':visible')) {
                    $('.toggle-otr ul', this).slideUp();
                }
                if ($('.toggle-smiley ul').is(':visible')) {
                    $('.toggle-smiley ul', this).slideUp();
                }
            });

            $(window).on("blur focus", $.proxy(function(e) {
                if ((this.windowState != e.type) && (e.type == 'focus')) {
                    converse.clearMsgCounter();
                }
                this.windowState = e.type;
            },this));
        };

        this.onReconnected = function () {
            // We need to re-register all the event handlers on the newly
            // created connection.
            this.initStatus($.proxy(function () {
                this.registerRosterXHandler();
                this.registerPresenceHandler();
                this.chatboxes.registerMessageHandler();
                converse.xmppstatus.sendPresence();
                this.giveFeedback(__('Online Contacts'));
            }, this));
        };

        this.onConnected = function () {
            if (this.debug) {
                this.connection.xmlInput = function (body) { console.log(body); };
                this.connection.xmlOutput = function (body) { console.log(body); };
                Strophe.log = function (level, msg) { console.log(level+' '+msg); };
                Strophe.error = function (msg) { console.log('ERROR: '+msg); };
            }
            this.bare_jid = Strophe.getBareJidFromJid(this.connection.jid);
            this.domain = Strophe.getDomainFromJid(this.connection.jid);
            this.features = new this.Features();
            this.initStatus($.proxy(function () {
                this.initRoster();
                this.chatboxes.onConnected();
                this.connection.roster.get(function () {});
                this.registerGlobalEventHandlers();
                this.giveFeedback(__('Online Contacts'));

                if (this.callback) {
                    if (this.connection.service === 'jasmine tests') {
                        // XXX: Call back with the internal converse object. This
                        // object should never be exposed to production systems.
                        // 'jasmine tests' is an invalid http bind service value,
                        // so we're sure that this is just for tests.
                        //
                        // TODO: We might need to consider websockets, which
                        // probably won't use the 'service' attr. Current
                        // strophe.js version used by converse.js doesn't support
                        // websockets.
                        this.callback(this);
                    } else  {
                        this.callback();
                    }
                }
            }, this));
            converse.emit('onReady');
        };

        // Backbone Models and Views
        // -------------------------
        this.OTR = Backbone.Model.extend({
            // A model for managing OTR settings.
            getSessionPassphrase: function () {
                if (converse.prebind) {
                    var key = hex_sha1(converse.connection.jid),
                        pass = window.sessionStorage[key];
                    if (typeof pass === 'undefined') {
                        pass = Math.floor(Math.random()*4294967295).toString();
                        window.sessionStorage[key] = pass;
                    }
                    return pass;
                } else {
                    return converse.connection.pass;
                }
            },

            generatePrivateKey: function () {
                var key = new DSA();
                var jid = converse.connection.jid;
                if (converse.cache_otr_key) {
                    var cipher = CryptoJS.lib.PasswordBasedCipher;
                    var pass = this.getSessionPassphrase();
                    if (typeof pass !== "undefined") {
                        // Encrypt the key and set in sessionStorage. Also store instance tag.
                        window.sessionStorage[hex_sha1(jid+'priv_key')] =
                            cipher.encrypt(CryptoJS.algo.AES, key.packPrivate(), pass).toString();
                        window.sessionStorage[hex_sha1(jid+'instance_tag')] = instance_tag;
                        window.sessionStorage[hex_sha1(jid+'pass_check')] = 
                            cipher.encrypt(CryptoJS.algo.AES, 'match', pass).toString();
                    }
                }
                return key;
            }
        });

        this.Message = Backbone.Model.extend();

        this.Messages = Backbone.Collection.extend({
            model: converse.Message
        });

        this.ChatBox = Backbone.Model.extend({
            initialize: function () {
                if (this.get('box_id') !== 'controlbox') {
                    this.messages = new converse.Messages();
                    this.messages.localStorage = new Backbone.LocalStorage(
                        hex_sha1('converse.messages'+this.get('jid')+converse.bare_jid));
                    this.set({
                        'user_id' : Strophe.getNodeFromJid(this.get('jid')),
                        'box_id' : hex_sha1(this.get('jid')),
                        'otr_status': this.get('otr_status') || UNENCRYPTED
                    });
                }
            },

            getSession: function (callback) {
                var cipher = CryptoJS.lib.PasswordBasedCipher;
                var result, pass, instance_tag, saved_key, pass_check;
                if (converse.cache_otr_key) {
                    pass = converse.otr.getSessionPassphrase();
                    if (typeof pass !== "undefined") {
                        instance_tag = window.sessionStorage[hex_sha1(this.id+'instance_tag')];
                        saved_key = window.sessionStorage[hex_sha1(this.id+'priv_key')];
                        pass_check = window.sessionStorage[hex_sha1(this.connection.jid+'pass_check')];
                        if (saved_key && instance_tag && typeof pass_check !== 'undefined') {
                            var decrypted = cipher.decrypt(CryptoJS.algo.AES, saved_key, pass);
                            var key = DSA.parsePrivate(decrypted.toString(CryptoJS.enc.Latin1));
                            if (cipher.decrypt(CryptoJS.algo.AES, pass_check, pass).toString(CryptoJS.enc.Latin1) === 'match') {
                                // Verified that the passphrase is still the same
                                this.trigger('showHelpMessages', [__('Re-establishing encrypted session')]);
                                callback({
                                    'key': key,
                                    'instance_tag': instance_tag
                                });
                                return; // Our work is done here
                            }
                        }
                    }
                }
                // We need to generate a new key and instance tag
                this.trigger('showHelpMessages', [
                    __('Generating private key.'),
                    __('Your browser might become unresponsive.')],
                    null,
                    true // show spinner
                );
                setTimeout(function () {
                    callback({
                        'key': converse.otr.generatePrivateKey.apply(this),
                        'instance_tag': OTR.makeInstanceTag()
                    });
                }, 500);
            },

            updateOTRStatus: function (state) {
                switch (state) {
                    case OTR.CONST.STATUS_AKE_SUCCESS:
                        if (this.otr.msgstate === OTR.CONST.MSGSTATE_ENCRYPTED) {
                            this.save({'otr_status': UNVERIFIED});
                        }
                        break;
                    case OTR.CONST.STATUS_END_OTR:
                        if (this.otr.msgstate === OTR.CONST.MSGSTATE_FINISHED) {
                            this.save({'otr_status': FINISHED});
                        } else if (this.otr.msgstate === OTR.CONST.MSGSTATE_PLAINTEXT) {
                            this.save({'otr_status': UNENCRYPTED});
                        }
                        break;
                }
            },

            onSMP: function (type, data) {
                // Event handler for SMP (Socialist's Millionaire Protocol)
                // used by OTR (off-the-record).
                switch (type) {
                    case 'question':
                        this.otr.smpSecret(prompt(__(
                            'Authentication request from %1$s\n\nYour buddy is attempting to verify your identity, by asking you the question below.\n\n%2$s',
                            [this.get('fullname'), data])));
                        break;
                    case 'trust':
                        if (data === true) {
                            this.save({'otr_status': VERIFIED});
                        } else {
                            this.trigger(
                                'showHelpMessages',
                                [__("Could not verify this user's identify.")],
                                'error');
                            this.save({'otr_status': UNVERIFIED});
                        }
                        break;
                    default:
                        throw new Error('Unknown type.');
                }
            },

            initiateOTR: function (query_msg) {
                // Sets up an OTR object through which we can send and receive
                // encrypted messages.
                //
                // If 'query_msg' is passed in, it means there is an alread incoming
                // query message from our buddy. Otherwise, it is us who will
                // send the query message to them.
                this.save({'otr_status': UNENCRYPTED});
                var session = this.getSession($.proxy(function (session) {
                    this.otr = new OTR({
                        fragment_size: 140,
                        send_interval: 200,
                        priv: session.key,
                        instance_tag: session.instance_tag,
                        debug: this.debug
                    });
                    this.otr.on('status', $.proxy(this.updateOTRStatus, this));
                    this.otr.on('smp', $.proxy(this.onSMP, this));

                    this.otr.on('ui', $.proxy(function (msg) {
                        this.trigger('showReceivedOTRMessage', msg);
                    }, this));
                    this.otr.on('io', $.proxy(function (msg) {
                        this.trigger('sendMessageStanza', msg);
                    }, this));
                    this.otr.on('error', $.proxy(function (msg) {
                        this.trigger('showOTRError', msg);
                    }, this));

                    this.trigger('showHelpMessages', [__('Exchanging private key with buddy.')]);
                    if (query_msg) {
                        this.otr.receiveMsg(query_msg);
                    } else {
                        this.otr.sendQueryMsg();
                    }
                }, this));
            },

            endOTR: function () {
                if (this.otr) {
                    this.otr.endOtr();
                }
                this.save({'otr_status': UNENCRYPTED});
            },

            createMessage: function (message) {
                var $message = $(message),
                    body = $message.children('body').text(),
                    from = Strophe.getBareJidFromJid($message.attr('from')),
                    composing = $message.find('composing'),
                    delayed = $message.find('delay').length > 0,
                    fullname = this.get('fullname'),
                    stamp, time, sender;
                fullname = (_.isEmpty(fullname)? from: fullname).split(' ')[0];

                if (!body) {
                    if (composing.length) {
                        this.messages.add({
                            fullname: fullname,
                            sender: 'them',
                            delayed: delayed,
                            time: converse.toISOString(new Date()),
                            composing: composing.length
                        });
                    }
                } else {
                    if (delayed) {
                        stamp = $message.find('delay').attr('stamp');
                        time = stamp;
                    } else {
                        time = converse.toISOString(new Date());
                    }
                    if (from == converse.bare_jid) {
                        sender = 'me';
                    } else {
                        sender = 'them';
                    }
                    this.messages.create({
                        fullname: fullname,
                        sender: sender,
                        delayed: delayed,
                        time: time,
                        message: body
                    });
                }
            },

            receiveMessage: function (message) {
                var $body = $(message).children('body');
                var text = ($body.length > 0 ? $body.text() : undefined);
                if ((!text) || (!converse.allow_otr)) {
                    return this.createMessage(message);
                }
                if (text.match(/^\?OTRv23?/)) {
                    this.initiateOTR(text);
                } else {
                    if (_.contains([UNVERIFIED, VERIFIED], this.get('otr_status'))) {
                        this.otr.receiveMsg(text);
                    } else {
                        if (text.match(/^\?OTR/)) {
                            if (!this.otr) {
                                this.initiateOTR(text);
                            } else {
                                this.otr.receiveMsg(text);
                            }
                        } else {
                            // Normal unencrypted message.
                            this.createMessage(message);
                        }
                    }
                }
            }
        });

        this.ChatBoxView = Backbone.View.extend({
            length: 200,
            tagName: 'div',
            className: 'chatbox',
            is_chatroom: false,  // This is not a multi-user chatroom

            events: {
                'click .close-chatbox-button': 'closeChat',
                'keypress textarea.chat-textarea': 'keyPressed',
                'click .toggle-smiley': 'toggleEmoticonMenu',
                'click .toggle-smiley ul li': 'insertEmoticon',
                'click .toggle-otr': 'toggleOTRMenu',
                'click .start-otr': 'startOTRFromToolbar',
                'click .end-otr': 'endOTR',
                'click .auth-otr': 'authOTR',
                'click .toggle-call': 'toggleCall'
            },

            template: _.template(
                '<div class="chat-head chat-head-chatbox">' +
                    '<a class="close-chatbox-button icon-close"></a>' +
                    '<a href="{{url}}" target="_blank" class="user">' +
                        '<div class="chat-title"> {{ fullname }} </div>' +
                    '</a>' +
                    '<p class="user-custom-message"><p/>' +
                '</div>' +
                '<div class="chat-content"></div>' +
                '<form class="sendXMPPMessage" action="" method="post">' +
                    '{[ if ('+converse.show_toolbar+') { ]}' +
                        '<ul class="chat-toolbar no-text-select"></ul>'+
                    '{[ } ]}' +
                '<textarea ' +
                    'type="text" ' +
                    'class="chat-textarea" ' +
                    'placeholder="'+__('Personal message')+'"/>'+
                '</form>'
            ),


            toolbar_template: _.template(
                '{[ if (show_emoticons)  { ]}' +
                    '<li class="toggle-smiley icon-happy" title="Insert a smilery">' +
                        '<ul>' +
                            '<li><a class="icon-smiley" href="#" data-emoticon=":)"></a></li>'+
                            '<li><a class="icon-wink" href="#" data-emoticon=";)"></a></li>'+
                            '<li><a class="icon-grin" href="#" data-emoticon=":D"></a></li>'+
                            '<li><a class="icon-tongue" href="#" data-emoticon=":P"></a></li>'+
                            '<li><a class="icon-cool" href="#" data-emoticon="8)"></a></li>'+
                            '<li><a class="icon-evil" href="#" data-emoticon=">:)"></a></li>'+
                            '<li><a class="icon-confused" href="#" data-emoticon=":S"></a></li>'+
                            '<li><a class="icon-wondering" href="#" data-emoticon=":\\"></a></li>'+
                            '<li><a class="icon-angry" href="#" data-emoticon=">:("></a></li>'+
                            '<li><a class="icon-sad" href="#" data-emoticon=":("></a></li>'+
                            '<li><a class="icon-shocked" href="#" data-emoticon=":O"></a></li>'+
                            '<li><a class="icon-thumbs-up" href="#" data-emoticon="(^.^)b"></a></li>'+
                            '<li><a class="icon-heart" href="#" data-emoticon="<3"></a></li>'+
                        '</ul>' +
                    '</li>' +
                '{[ } ]}' +
                '{[ if (' + converse.show_call_button + ')  { ]}' +
                    '<li><a class="toggle-call icon-phone" title="Start a call"></a></li>' +
                '{[ } ]}' +
                '{[ if (allow_otr)  { ]}' +
                    '<li class="toggle-otr {{otr_status_class}}" title="{{otr_tooltip}}">'+
                        '<span class="chat-toolbar-text">{{otr_translated_status}}</span>'+
                        '{[ if (otr_status == "'+UNENCRYPTED+'") { ]}' +
                            '<span class="icon-unlocked"></span>'+
                        '{[ } ]}' +
                        '{[ if (otr_status == "'+UNVERIFIED+'") { ]}' +
                            '<span class="icon-lock"></span>'+
                        '{[ } ]}' +
                        '{[ if (otr_status == "'+VERIFIED+'") { ]}' +
                            '<span class="icon-lock"></span>'+
                        '{[ } ]}' +
                        '{[ if (otr_status == "'+FINISHED+'") { ]}' +
                            '<span class="icon-unlocked"></span>'+
                        '{[ } ]}' +
                        '<ul>'+
                            '{[ if (otr_status == "'+UNENCRYPTED+'") { ]}' +
                                '<li><a class="start-otr" href="#">'+__('Start encrypted conversation')+'</a></li>'+
                            '{[ } ]}' +
                            '{[ if (otr_status != "'+UNENCRYPTED+'") { ]}' +
                                '<li><a class="start-otr" href="#">'+__('Refresh encrypted conversation')+'</a></li>'+
                                '<li><a class="end-otr" href="#">'+__('End encrypted conversation')+'</a></li>'+
                                '<li><a class="auth-otr" data-scheme="smp" href="#">'+__('Verify with SMP')+'</a></li>'+
                            '{[ } ]}' +
                            '{[ if (otr_status == "'+UNVERIFIED+'") { ]}' +
                                '<li><a class="auth-otr" data-scheme="fingerprint" href="#">'+__('Verify with fingerprints')+'</a></li>'+
                            '{[ } ]}' +
                            '<li><a href="http://www.cypherpunks.ca/otr/help/3.2.0/levels.php" target="_blank">'+__("What\'s this?")+'</a></li>'+
                        '</ul>'+
                    '</li>'+
                '{[ } ]}'
            ),

            message_template: _.template(
                '<div class="chat-message {{extra_classes}}">' +
                    '<span class="chat-message-{{sender}}">{{time}} {{username}}:&nbsp;</span>' +
                    '<span class="chat-message-content">{{message}}</span>' +
                '</div>'),

            action_template: _.template(
                '<div class="chat-message {{extra_classes}}">' +
                    '<span class="chat-message-{{sender}}">{{time}} **{{username}} </span>' +
                    '<span class="chat-message-content">{{message}}</span>' +
                '</div>'),

            new_day_template: _.template(
                '<time class="chat-date" datetime="{{isodate}}">{{datestring}}</time>'
                ),

            initialize: function (){
                this.model.messages.on('add', this.onMessageAdded, this);
                this.model.on('show', this.show, this);
                this.model.on('destroy', this.hide, this);
                this.model.on('change', this.onChange, this);
                this.model.on('showOTRError', this.showOTRError, this);
                this.model.on('buddyStartsOTR', this.buddyStartsOTR, this);
                this.model.on('showHelpMessages', this.showHelpMessages, this);
                this.model.on('sendMessageStanza', this.sendMessageStanza, this);
                this.model.on('showSentOTRMessage', function (text) {
                    this.showMessage({'message': text, 'sender': 'me'});
                }, this);
                this.model.on('showReceivedOTRMessage', function (text) {
                    this.showMessage({'message': text, 'sender': 'them'});
                }, this);
                this.updateVCard();
                this.$el.appendTo(converse.chatboxesview.$el);
                this.render().show().model.messages.fetch({add: true});

                if (this.model.get('status')) {
                    this.showStatusMessage(this.model.get('status'));
                }
                if ((_.contains([UNVERIFIED, VERIFIED], this.model.get('otr_status'))) || converse.use_otr_by_default) {
                    this.model.initiateOTR();
                }
            },

            render: function () {
                this.$el.attr('id', this.model.get('box_id'))
                    .html(this.template(this.model.toJSON()));
                this.renderToolbar().renderAvatar();
                return this;
            },

            showStatusNotification: function (message, replace) {
                var $chat_content = this.$el.find('.chat-content');
                $chat_content.find('div.chat-event').remove().end()
                    .append($('<div class="chat-event"></div>').text(message));
                this.scrollDown();
            },

            showMessage: function (msg_dict) {
                var $el = this.$el.find('.chat-content'),
                    msg_date = msg_dict.time ? converse.parseISO8601(msg_dict.time) : new Date(),
                    text = msg_dict.message,
                    match = text.match(/^\/(.*?)(?: (.*))?$/),
                    fullname = msg_dict.fullname || this.model.get('fullname'),
                    template, username;

                if ((match) && (match[1] === 'me')) {
                    text = text.replace(/^\/me/, '');
                    template = this.action_template;
                    username = fullname;
                } else  {
                    template = this.message_template;
                    username = msg_dict.sender === 'me' && __('me') || fullname;
                }
                $el.find('div.chat-event').remove();
                var message = template({
                    'sender': msg_dict.sender,
                    'time': msg_date.toTimeString().substring(0,5),
                    'username': username,
                    'message': '',
                    'extra_classes': msg_dict.delayed && 'delayed' || ''
                });
                $el.append($(message).children('.chat-message-content').first().text(text).addHyperlinks().addEmoticons().parent());
                return this.scrollDown();
            },

            showHelpMessages: function (msgs, type, spinner) {
                var $chat_content = this.$el.find('.chat-content'), i,
                    msgs_length = msgs.length;
                for (i=0; i<msgs_length; i++) {
                    $chat_content.append($('<div class="chat-'+(type||'info')+'">'+msgs[i]+'</div>'));
                }
                if (spinner === true) {
                    $chat_content.append('<span class="spinner"/>');
                } else if (spinner === false) {
                    $chat_content.find('span.spinner').remove();
                }
                return this.scrollDown();
            },

            onMessageAdded: function (message) {
                var time = message.get('time'),
                    times = this.model.messages.pluck('time'),
                    this_date = converse.parseISO8601(time),
                    previous_message, idx, prev_date, isodate, text, match;

                // If this message is on a different day than the one received
                // prior, then indicate it on the chatbox.
                idx = _.indexOf(times, time)-1;
                if (idx >= 0) {
                    previous_message = this.model.messages.at(idx);
                    prev_date = converse.parseISO8601(previous_message.get('time'));
                    isodate = new Date(this_date.getTime());
                    isodate.setUTCHours(0,0,0,0);
                    isodate = converse.toISOString(isodate);
                    if (this.isDifferentDay(prev_date, this_date)) {
                        this.$el.find('.chat-content').append(this.new_day_template({
                            isodate: isodate,
                            datestring: this_date.toString().substring(0,15)
                        }));
                    }
                }
                if (message.get('composing')) {
                    this.showStatusNotification(message.get('fullname')+' '+'is typing');
                    return;
                } else {
                    this.showMessage(_.clone(message.attributes));
                }
                if ((message.get('sender') != 'me') && (converse.windowState == 'blur')) {
                    converse.incrementMsgCounter();
                }
                return this.scrollDown();
            },

            isDifferentDay: function (prev_date, next_date) {
                return (
                    (next_date.getDate() != prev_date.getDate()) ||
                    (next_date.getFullYear() != prev_date.getFullYear()) ||
                    (next_date.getMonth() != prev_date.getMonth()));
            },

            sendMessageStanza: function (text) {
                /*
                 * Sends the actual XML stanza to the XMPP server.
                 */
                // TODO: Look in ChatPartners to see what resources we have for the recipient.
                // if we have one resource, we sent to only that resources, if we have multiple
                // we send to the bare jid.
                var timestamp = (new Date()).getTime();
                var bare_jid = this.model.get('jid');
                var message = $msg({from: converse.connection.jid, to: bare_jid, type: 'chat', id: timestamp})
                    .c('body').t(text).up()
                    .c('active', {'xmlns': 'http://jabber.org/protocol/chatstates'});
                // Forward the message, so that other connected resources are also aware of it.
                // TODO: Forward the message only to other connected resources (inside the browser)
                var forwarded = $msg({to:converse.bare_jid, type:'chat', id:timestamp})
                                .c('forwarded', {xmlns:'urn:xmpp:forward:0'})
                                .c('delay', {xmns:'urn:xmpp:delay',stamp:timestamp}).up()
                                .cnode(message.tree());

                converse.connection.send(message);
                converse.connection.send(forwarded);
            },

            sendMessage: function (text) {
                var match = text.replace(/^\s*/, "").match(/^\/(.*)\s*$/), msgs;
                if (match) {
                    if (match[1] === "clear") {
                        this.$el.find('.chat-content').empty();
                        this.model.messages.reset().localStorage._clear();
                        return;
                    }
                    else if (match[1] === "help") {
                        msgs = [
                            '<strong>/help</strong>:'+__('Show this menu')+'',
                            '<strong>/me</strong>:'+__('Write in the third person')+'',
                            '<strong>/clear</strong>:'+__('Remove messages')+''
                            ];
                        this.showHelpMessages(msgs);
                        return;
                    } else if ((converse.allow_otr) && (match[1] === "endotr")) {
                        return this.endOTR();
                    } else if ((converse.allow_otr) && (match[1] === "otr")) {
                        return this.model.initiateOTR();
                    }
                }
                if (_.contains([UNVERIFIED, VERIFIED], this.model.get('otr_status'))) {
                    // Off-the-record encryption is active
                    this.model.otr.sendMsg(text);
                    this.model.trigger('showSentOTRMessage', text);
                } else {
                    // We only save unencrypted messages.
                    var fullname = converse.xmppstatus.get('fullname');
                    fullname = _.isEmpty(fullname)? converse.bare_jid: fullname;
                    this.model.messages.create({
                        fullname: fullname,
                        sender: 'me',
                        time: converse.toISOString(new Date()),
                        message: text
                    });
                    this.sendMessageStanza(text);
                }
            },

            keyPressed: function (ev) {
                var $textarea = $(ev.target),
                    message, notify, composing;
                if(ev.keyCode == KEY.ENTER) {
                    ev.preventDefault();
                    message = $textarea.val();
                    $textarea.val('').focus();
                    if (message !== '') {
                        if (this.model.get('chatroom')) {
                            this.sendChatRoomMessage(message);
                        } else {
                            this.sendMessage(message);
                        }
                        converse.emit('onMessageSend', message);
                    }
                    this.$el.data('composing', false);
                } else if (!this.model.get('chatroom')) {
                    // composing data is only for single user chat
                    composing = this.$el.data('composing');
                    if (!composing) {
                        if (ev.keyCode != 47) {
                            // We don't send composing messages if the message
                            // starts with forward-slash.
                            notify = $msg({'to':this.model.get('jid'), 'type': 'chat'})
                                            .c('composing', {'xmlns':'http://jabber.org/protocol/chatstates'});
                            converse.connection.send(notify);
                        }
                        this.$el.data('composing', true);
                    }
                }
            },

            insertEmoticon: function (ev) {
                ev.stopPropagation();
                this.$el.find('.toggle-smiley ul').slideToggle(200);
                var $textbox = this.$el.find('textarea.chat-textarea');
                var value = $textbox.val();
                var $target = $(ev.target);
                $target = $target.is('a') ? $target : $target.children('a');
                if (value && (value[value.length-1] !== ' ')) {
                    value = value + ' ';
                }
                $textbox.focus().val(value+$target.data('emoticon')+' ');
            },

            toggleEmoticonMenu: function (ev) {
                ev.stopPropagation();
                this.$el.find('.toggle-smiley ul').slideToggle(200);
            },

            toggleOTRMenu: function (ev) {
                ev.stopPropagation();
                this.$el.find('.toggle-otr ul').slideToggle(200);
            },

            showOTRError: function (msg) {
                if (msg == 'Message cannot be sent at this time.') {
                    this.showHelpMessages(
                        [__('Your message could not be sent')], 'error');
                } else if (msg == 'Received an unencrypted message.') {
                    this.showHelpMessages(
                        [__('We received an unencrypted message')], 'error');
                } else if (msg == 'Received an unreadable encrypted message.') {
                    this.showHelpMessages(
                        [__('We received an unreadable encrypted message')],
                        'error');
                } else {
                    this.showHelpMessages(['Encryption error occured: '+msg], 'error');
                }
                console.log("OTR ERROR:"+msg);
            },

            buddyStartsOTR: function (ev) {
                this.showHelpMessages([__('This user has requested an encrypted session.')]);
                this.model.initiateOTR();
            },

            startOTRFromToolbar: function (ev) {
                $(ev.target).parent().parent().slideUp();
                ev.stopPropagation();
                this.model.initiateOTR();
            },

            endOTR: function (ev) {
                if (typeof ev !== "undefined") {
                    ev.preventDefault();
                    ev.stopPropagation();
                }
                this.model.endOTR();
            },

            authOTR: function (ev) {
                var scheme = $(ev.target).data().scheme;
                var result, question, answer;
                if (scheme === 'fingerprint') {
                    result = confirm(__('Here are the fingerprints, please confirm them with %1$s, outside of this chat.\n\nFingerprint for you, %2$s: %3$s\n\nFingerprint for %1$s: %4$s\n\nIf you have confirmed that the fingerprints match, click OK, otherwise click Cancel.', [
                            this.model.get('fullname'),
                            converse.xmppstatus.get('fullname')||converse.bare_jid,
                            this.model.otr.priv.fingerprint(),
                            this.model.otr.their_priv_pk.fingerprint()
                        ]
                    ));
                    if (result === true) {
                        this.model.save({'otr_status': VERIFIED});
                    } else {
                        this.model.save({'otr_status': UNVERIFIED});
                    }
                } else if (scheme === 'smp') {
                    alert(__('You will be prompted to provide a security question and then an answer to that question.\n\nYour buddy will then be prompted the same question and if they type the exact same answer (case sensitive), their identity will be verified.'));
                    question = prompt(__('What is your security question?'));
                    if (question) {
                        answer = prompt(__('What is the answer to the security question?'));
                        this.model.otr.smpSecret(answer, question);
                    }
                } else {
                    this.showHelpMessages([__('Invalid authentication scheme provided')], 'error');
                }
            },

            toggleCall: function (ev) {
                ev.stopPropagation();

                converse.emit('onCallButtonClicked', {
                    connection: converse.connection,
                    model: this.model
                });
            },

            onChange: function (item, changed) {
                if (_.has(item.changed, 'chat_status')) {
                    var chat_status = item.get('chat_status'),
                        fullname = item.get('fullname');
                    fullname = _.isEmpty(fullname)? item.get('jid'): fullname;
                    if (this.$el.is(':visible')) {
                        if (chat_status === 'offline') {
                            this.showStatusNotification(fullname+' '+'has gone offline');
                        } else if (chat_status === 'away') {
                            this.showStatusNotification(fullname+' '+'has gone away');
                        } else if ((chat_status === 'dnd')) {
                            this.showStatusNotification(fullname+' '+'is busy');
                        } else if (chat_status === 'online') {
                            this.$el.find('div.chat-event').remove();
                        }
                    }
                    converse.emit('onBuddyStatusChanged', item.attributes, item.get('chat_status'));
                }
                if (_.has(item.changed, 'status')) {
                    this.showStatusMessage(item.get('status'));
                    converse.emit('onBuddyStatusMessageChanged', item.attributes, item.get('status'));
                }
                if (_.has(item.changed, 'image')) {
                    this.renderAvatar();
                }
                if (_.has(item.changed, 'otr_status')) {
                    this.renderToolbar().informOTRChange();
                }
                // TODO check for changed fullname as well
            },

            showStatusMessage: function (msg) {
                this.$el.find('p.user-custom-message').text(msg).attr('title', msg);
            },

            closeChat: function () {
                if (converse.connection) {
                    this.model.destroy();
                } else {
                    this.model.trigger('hide');
                }
            },

            updateVCard: function () {
                var jid = this.model.get('jid'),
                    rosteritem = converse.roster.get(jid);
                if ((rosteritem) && (!rosteritem.get('vcard_updated'))) {
                    converse.getVCard(
                        jid,
                        $.proxy(function (jid, fullname, image, image_type, url) {
                            this.model.save({
                                'fullname' : fullname || jid,
                                'url': url,
                                'image_type': image_type,
                                'image': image
                            });
                        }, this),
                        $.proxy(function (stanza) {
                            converse.log("ChatBoxView.initialize: An error occured while fetching vcard");
                        }, this)
                    );
                }
            },

            informOTRChange: function () {
                var data = this.model.toJSON();
                var msgs = [];
                if (data.otr_status == UNENCRYPTED) {
                    msgs.push(__("Your messages are not encrypted anymore"));
                } else if (data.otr_status == UNVERIFIED){
                    msgs.push(__("Your messages are now encrypted but your buddy's identity has not been verified."));
                } else if (data.otr_status == VERIFIED){
                    msgs.push(__("Your buddy's identify has been verified."));
                } else if (data.otr_status == FINISHED){
                    msgs.push(__("Your buddy has ended encryption on their end, you should do the same."));
                }
                return this.showHelpMessages(msgs, 'info', false);
            },

            renderToolbar: function () {
                if (converse.show_toolbar) {
                    var data = this.model.toJSON();
                    if (data.otr_status == UNENCRYPTED) {
                        data.otr_tooltip = __('Your messages are not encrypted. Click here to enable OTR encryption.');
                    } else if (data.otr_status == UNVERIFIED){
                        data.otr_tooltip = __('Your messages are encrypted, but your buddy has not been verified.');
                    } else if (data.otr_status == VERIFIED){
                        data.otr_tooltip = __('Your messages are encrypted and your buddy verified.');
                    } else if (data.otr_status == FINISHED){
                        data.otr_tooltip = __('Your buddy has closed their end of the private session, you should do the same');
                    }
                    data.allow_otr = converse.allow_otr && !this.is_chatroom;
                    data.show_emoticons = converse.show_emoticons;
                    data.otr_translated_status = OTR_TRANSLATED_MAPPING[data.otr_status];
                    data.otr_status_class = OTR_CLASS_MAPPING[data.otr_status];
                    this.$el.find('.chat-toolbar').html(this.toolbar_template(data));
                }
                return this;
            },

            renderAvatar: function () {
                if (!this.model.get('image')) {
                    return;
                }
                var img_src = 'data:'+this.model.get('image_type')+';base64,'+this.model.get('image'),
                    canvas = $('<canvas height="33px" width="33px" class="avatar"></canvas>').get(0);

                if (!(canvas.getContext && canvas.getContext('2d'))) {
                    return this;
                }
                var ctx = canvas.getContext('2d');
                var img = new Image();   // Create new Image object
                img.onload = function() {
                    var ratio = img.width/img.height;
                    ctx.drawImage(img, 0,0, 35*ratio, 35);
                };
                img.src = img_src;
                this.$el.find('.chat-title').before(canvas);
                return this;
            },

            focus: function () {
                this.$el.find('.chat-textarea').focus();
                return this;
            },

            hide: function () {
                if (this.$el.is(':visible') && this.$el.css('opacity') == "1") {
                    if (converse.animate) {
                        this.$el.hide('fast');
                    } else {
                        this.$el.hide();
                    }
                    converse.emit('onChatBoxClosed', this);
                }
            },

            show: function () {
                if (this.$el.is(':visible') && this.$el.css('opacity') == "1") {
                    converse.emit('onChatBoxFocused', this);
                    return this.focus();
                }
                if (converse.animate) {
                    this.$el.css({'opacity': 0, 'display': 'inline'}).animate({opacity: '1'}, 200);
                } else {
                    this.$el.css({'opacity': 1, 'display': 'inline'});
                }
                if (converse.connection) {
                    // Without a connection, we haven't yet initialized
                    // localstorage
                    this.model.save();
                }
                converse.emit('onChatBoxOpened', this);
                return this;
            },

            scrollDown: function () {
                var $content = this.$el.find('.chat-content');
                $content.scrollTop($content[0].scrollHeight);
                return this;
            }
        });

        this.ContactsPanel = Backbone.View.extend({
            tagName: 'div',
            className: 'oc-chat-content',
            id: 'users',
            events: {
                'click a.toggle-xmpp-contact-form': 'toggleContactForm',
                'submit form.add-xmpp-contact': 'addContactFromForm',
                'submit form.search-xmpp-contact': 'searchContacts',
                'click a.subscribe-to-user': 'addContactFromList'
            },

            tab_template: _.template('<li><a class="s current" href="#users">'+__('Contacts')+'</a></li>'),
            template: _.template(
                '<form class="set-xmpp-status" action="" method="post">'+
                    '<span id="xmpp-status-holder">'+
                        '<select id="select-xmpp-status" style="display:none">'+
                            '<option value="online">'+__('Online')+'</option>'+
                            '<option value="dnd">'+__('Busy')+'</option>'+
                            '<option value="away">'+__('Away')+'</option>'+
                            '<option value="offline">'+__('Offline')+'</option>'+
                        '</select>'+
                    '</span>'+
                '</form>'
            ),

            add_contact_dropdown_template: _.template(
                '<dl class="add-converse-contact dropdown">' +
                    '<dt id="xmpp-contact-search" class="fancy-dropdown">' +
                        '<a class="toggle-xmpp-contact-form" href="#"'+
                            'title="'+__('Click to add new chat contacts')+'">'+
                        '<span class="icon-plus"></span>'+__('Add a contact')+'</a>' +
                    '</dt>' +
                    '<dd class="search-xmpp" style="display:none"><ul></ul></dd>' +
                '</dl>'
            ),

            add_contact_form_template: _.template(
                '<li>'+
                    '<form class="add-xmpp-contact">' +
                        '<input type="text" name="identifier" class="username" placeholder="'+__('Contact username')+'"/>' +
                        '<button type="submit">'+__('Add')+'</button>' +
                    '</form>'+
                '<li>'
            ),

            search_contact_template: _.template(
                '<li>'+
                    '<form class="search-xmpp-contact">' +
                        '<input type="text" name="identifier" class="username" placeholder="'+__('Contact name')+'"/>' +
                        '<button type="submit">'+__('Search')+'</button>' +
                    '</form>'+
                '<li>'
            ),

            initialize: function (cfg) {
                cfg.$parent.append(this.$el);
                this.$tabs = cfg.$parent.parent().find('#controlbox-tabs');
            },

            render: function () {
                var markup;
                var widgets = this.template();

                this.$tabs.append(this.tab_template());
                if (converse.xhr_user_search) {
                    markup = this.search_contact_template();
                } else {
                    markup = this.add_contact_form_template();
                }

                if (converse.allow_contact_requests) {
                    widgets += this.add_contact_dropdown_template();
                }
                this.$el.html(widgets);

                this.$el.find('.search-xmpp ul').append(markup);
                this.$el.append(converse.rosterview.$el);
                return this;
            },

            toggleContactForm: function (ev) {
                ev.preventDefault();
                this.$el.find('.search-xmpp').toggle('fast', function () {
                    if ($(this).is(':visible')) {
                        $(this).find('input.username').focus();
                    }
                });
            },

            searchContacts: function (ev) {
                ev.preventDefault();
                $.getJSON(xhr_user_search_url+ "?q=" + $(ev.target).find('input.username').val(), function (data) {
                    var $ul= $('.search-xmpp ul');
                    $ul.find('li.found-user').remove();
                    $ul.find('li.chat-info').remove();
                    if (!data.length) {
                        $ul.append('<li class="chat-info">'+__('No users found')+'</li>');
                    }

                    $(data).each(function (idx, obj) {
                        $ul.append(
                            $('<li class="found-user"></li>')
                            .append(
                                $('<a class="subscribe-to-user" href="#" title="'+__('Click to add as a chat contact')+'"></a>')
                                .attr('data-recipient', Strophe.escapeNode(obj.id)+'@'+converse.domain)
                                .text(obj.fullname)
                            )
                        );
                    });
                });
            },

            addContactFromForm: function (ev) {
                ev.preventDefault();
                var $input = $(ev.target).find('input');
                var jid = $input.val();
                if (! jid) {
                    // this is not a valid JID
                    $input.addClass('error');
                    return;
                }
                this.addContact(jid);
                $('.search-xmpp').hide();
            },

            addContactFromList: function (ev) {
                ev.preventDefault();
                var $target = $(ev.target),
                    jid = $target.attr('data-recipient'),
                    name = $target.text();
                this.addContact(jid, name);
                $target.parent().remove();
                $('.search-xmpp').hide();
            },

            addContact: function (jid, name) {
                name = _.isEmpty(name)? jid: name;
                converse.connection.roster.add(jid, name, [], function (iq) {
                    converse.connection.roster.subscribe(jid, null, converse.xmppstatus.get('fullname'));
                });
            }
        });

        this.RoomsPanel = Backbone.View.extend({
            tagName: 'div',
            id: 'chatrooms',
            events: {
                'submit form.add-chatroom': 'createChatRoom',
                'click input#show-rooms': 'showRooms',
                'click a.open-room': 'createChatRoom',
                'click a.room-info': 'showRoomInfo'
            },
            room_template: _.template(
                '<dd class="available-chatroom">'+
                '<a class="open-room" data-room-jid="{{jid}}"'+
                    'title="'+__('Click to open this room')+'" href="#">{{name}}</a>'+
                '<a class="room-info icon-room-info" data-room-jid="{{jid}}"'+
                    'title="'+__('Show more information on this room')+'" href="#">&nbsp;</a>'+
                '</dd>'),

            // FIXME: check markup in mockup
            room_description_template: _.template(
                '<div class="room-info">'+
                '<p class="room-info"><strong>'+__('Description:')+'</strong> {{desc}}</p>' +
                '<p class="room-info"><strong>'+__('Occupants:')+'</strong> {{occ}}</p>' +
                '<p class="room-info"><strong>'+__('Features:')+'</strong> <ul>'+
                '{[ if (passwordprotected) { ]}' +
                    '<li class="room-info locked">'+__('Requires authentication')+'</li>' +
                '{[ } ]}' +
                '{[ if (hidden) { ]}' +
                    '<li class="room-info">'+__('Hidden')+'</li>' +
                '{[ } ]}' +
                '{[ if (membersonly) { ]}' +
                    '<li class="room-info">'+__('Requires an invitation')+'</li>' +
                '{[ } ]}' +
                '{[ if (moderated) { ]}' +
                    '<li class="room-info">'+__('Moderated')+'</li>' +
                '{[ } ]}' +
                '{[ if (nonanonymous) { ]}' +
                    '<li class="room-info">'+__('Non-anonymous')+'</li>' +
                '{[ } ]}' +
                '{[ if (open) { ]}' +
                    '<li class="room-info">'+__('Open room')+'</li>' +
                '{[ } ]}' +
                '{[ if (persistent) { ]}' +
                    '<li class="room-info">'+__('Permanent room')+'</li>' +
                '{[ } ]}' +
                '{[ if (publicroom) { ]}' +
                    '<li class="room-info">'+__('Public')+'</li>' +
                '{[ } ]}' +
                '{[ if (semianonymous) { ]}' +
                    '<li class="room-info">'+__('Semi-anonymous')+'</li>' +
                '{[ } ]}' +
                '{[ if (temporary) { ]}' +
                    '<li class="room-info">'+__('Temporary room')+'</li>' +
                '{[ } ]}' +
                '{[ if (unmoderated) { ]}' +
                    '<li class="room-info">'+__('Unmoderated')+'</li>' +
                '{[ } ]}' +
                '</p>' +
                '</div>'
            ),

            tab_template: _.template('<li><a class="s" href="#chatrooms">'+__('Rooms')+'</a></li>'),

            template: _.template(
                '<form class="add-chatroom" action="" method="post">'+
                    '<input type="text" name="chatroom" class="new-chatroom-name" placeholder="'+__('Room name')+'"/>'+
                    '<input type="text" name="nick" class="new-chatroom-nick" placeholder="'+__('Nickname')+'"/>'+
                    '<input type="{{ server_input_type }}" name="server" class="new-chatroom-server" placeholder="'+__('Server')+'"/>'+
                    '<input type="submit" name="join" value="'+__('Join')+'"/>'+
                    '<input type="button" name="show" id="show-rooms" value="'+__('Show rooms')+'"/>'+
                '</form>'+
                '<dl id="available-chatrooms"></dl>'),

            initialize: function (cfg) {
                cfg.$parent.append(
                    this.$el.html(
                        this.template({
                            server_input_type: converse.hide_muc_server && 'hidden' || 'text'
                        })
                    ).hide());
                this.$tabs = cfg.$parent.parent().find('#controlbox-tabs');

                this.on('update-rooms-list', function (ev) {
                    this.updateRoomsList();
                });
                converse.xmppstatus.on("change", $.proxy(function (model) {
                    if (!(_.has(model.changed, 'fullname'))) {
                        return;
                    }
                    var $nick = this.$el.find('input.new-chatroom-nick');
                    if (! $nick.is(':focus')) {
                        $nick.val(model.get('fullname'));
                    }
                }, this));
            },

            render: function () {
                this.$tabs.append(this.tab_template());
                return this;
            },

            informNoRoomsFound: function () {
                var $available_chatrooms = this.$el.find('#available-chatrooms');
                // # For translators: %1$s is a variable and will be replaced with the XMPP server name
                $available_chatrooms.html('<dt>'+__('No rooms on %1$s',this.muc_domain)+'</dt>');
                $('input#show-rooms').show().siblings('span.spinner').remove();
            },

            updateRoomsList: function (domain) {
                converse.connection.muc.listRooms(
                    this.muc_domain,
                    $.proxy(function (iq) { // Success
                        var name, jid, i, fragment,
                            that = this,
                            $available_chatrooms = this.$el.find('#available-chatrooms');
                        this.rooms = $(iq).find('query').find('item');
                        if (this.rooms.length) {
                            // # For translators: %1$s is a variable and will be
                            // # replaced with the XMPP server name
                            $available_chatrooms.html('<dt>'+__('Rooms on %1$s',this.muc_domain)+'</dt>');
                            fragment = document.createDocumentFragment();
                            for (i=0; i<this.rooms.length; i++) {
                                name = Strophe.unescapeNode($(this.rooms[i]).attr('name')||$(this.rooms[i]).attr('jid'));
                                jid = $(this.rooms[i]).attr('jid');
                                fragment.appendChild($(this.room_template({
                                    'name':name,
                                    'jid':jid
                                    }))[0]);
                            }
                            $available_chatrooms.append(fragment);
                            $('input#show-rooms').show().siblings('span.spinner').remove();
                        } else {
                            this.informNoRoomsFound();
                        }
                        return true;
                    }, this),
                    $.proxy(function (iq) { // Failure
                        this.informNoRoomsFound();
                    }, this));
            },

            showRooms: function (ev) {
                var $available_chatrooms = this.$el.find('#available-chatrooms');
                var $server = this.$el.find('input.new-chatroom-server');
                var server = $server.val();
                if (!server) {
                    $server.addClass('error');
                    return;
                }
                this.$el.find('input.new-chatroom-name').removeClass('error');
                $server.removeClass('error');
                $available_chatrooms.empty();
                $('input#show-rooms').hide().after('<span class="spinner"/>');
                this.muc_domain = server;
                this.updateRoomsList();
            },

            showRoomInfo: function (ev) {
                var target = ev.target,
                    $dd = $(target).parent('dd'),
                    $div = $dd.find('div.room-info');
                if ($div.length) {
                    $div.remove();
                } else {
                    $dd.find('span.spinner').remove();
                    $dd.append('<span class="spinner hor_centered"/>');
                    converse.connection.disco.info(
                        $(target).attr('data-room-jid'),
                        null,
                        $.proxy(function (stanza) {
                            var $stanza = $(stanza);
                            // All MUC features found here: http://xmpp.org/registrar/disco-features.html
                            $dd.find('span.spinner').replaceWith(
                                this.room_description_template({
                                    'desc': $stanza.find('field[var="muc#roominfo_description"] value').text(),
                                    'occ': $stanza.find('field[var="muc#roominfo_occupants"] value').text(),
                                    'hidden': $stanza.find('feature[var="muc_hidden"]').length,
                                    'membersonly': $stanza.find('feature[var="muc_membersonly"]').length,
                                    'moderated': $stanza.find('feature[var="muc_moderated"]').length,
                                    'nonanonymous': $stanza.find('feature[var="muc_nonanonymous"]').length,
                                    'open': $stanza.find('feature[var="muc_open"]').length,
                                    'passwordprotected': $stanza.find('feature[var="muc_passwordprotected"]').length,
                                    'persistent': $stanza.find('feature[var="muc_persistent"]').length,
                                    'publicroom': $stanza.find('feature[var="muc_public"]').length,
                                    'semianonymous': $stanza.find('feature[var="muc_semianonymous"]').length,
                                    'temporary': $stanza.find('feature[var="muc_temporary"]').length,
                                    'unmoderated': $stanza.find('feature[var="muc_unmoderated"]').length
                                }));
                        }, this));
                }
            },

            createChatRoom: function (ev) {
                ev.preventDefault();
                var name, $name,
                    server, $server,
                    jid,
                    $nick = this.$el.find('input.new-chatroom-nick'),
                    nick = $nick.val(),
                    chatroom;

                if (!nick) { $nick.addClass('error'); }
                else { $nick.removeClass('error'); }

                if (ev.type === 'click') {
                    jid = $(ev.target).attr('data-room-jid');
                } else {
                    $name = this.$el.find('input.new-chatroom-name');
                    $server= this.$el.find('input.new-chatroom-server');
                    server = $server.val();
                    name = $name.val().trim().toLowerCase();
                    $name.val(''); // Clear the input
                    if (name && server) {
                        jid = Strophe.escapeNode(name) + '@' + server;
                        $name.removeClass('error');
                        $server.removeClass('error');
                        this.muc_domain = server;
                    } else {
                        if (!name) { $name.addClass('error'); }
                        if (!server) { $server.addClass('error'); }
                        return;
                    }
                }
                if (!nick) { return; }
                chatroom = converse.chatboxesview.showChatBox({
                    'id': jid,
                    'jid': jid,
                    'name': Strophe.unescapeNode(Strophe.getNodeFromJid(jid)),
                    'nick': nick,
                    'chatroom': true,
                    'box_id' : hex_sha1(jid)
                });
                if (!chatroom.get('connected')) {
                    converse.chatboxesview.views[jid].connect(null);
                }
            }
        });

        this.ControlBoxView = converse.ChatBoxView.extend({
            tagName: 'div',
            className: 'chatbox',
            id: 'controlbox',
            events: {
                'click a.close-chatbox-button': 'closeChat',
                'click ul#controlbox-tabs li a': 'switchTab'
            },

            initialize: function () {
                this.$el.appendTo(converse.chatboxesview.$el);
                this.model.on('change', $.proxy(function (item, changed) {
                    var i;
                    if (_.has(item.changed, 'connected')) {
                        this.render();
                        converse.features.on('add', $.proxy(this.featureAdded, this));
                        // Features could have been added before the controlbox was
                        // initialized. Currently we're only interested in MUC
                        var feature = converse.features.findWhere({'var': 'http://jabber.org/protocol/muc'});
                        if (feature) {
                            this.featureAdded(feature);
                        }
                    }
                    if (_.has(item.changed, 'visible')) {
                        if (item.changed.visible === true) {
                            this.show();
                        }
                    }
                }, this));
                this.model.on('show', this.show, this);
                this.model.on('destroy', this.hide, this);
                this.model.on('hide', this.hide, this);
                if (this.model.get('visible')) {
                    this.show();
                }
            },

            featureAdded: function (feature) {
                if ((feature.get('var') == 'http://jabber.org/protocol/muc') && (converse.allow_muc)) {
                    this.roomspanel.muc_domain = feature.get('from');
                    var $server= this.$el.find('input.new-chatroom-server');
                    if (! $server.is(':focus')) {
                        $server.val(this.roomspanel.muc_domain);
                    }
                    if (converse.auto_list_rooms) {
                        this.roomspanel.trigger('update-rooms-list');
                    }
                }
            },

            template: _.template(
                '<div class="chat-head oc-chat-head">'+
                    '<ul id="controlbox-tabs"></ul>'+
                    '<a class="close-chatbox-button icon-close"></a>'+
                '</div>'+
                '<div class="controlbox-panes"></div>'
            ),

            switchTab: function (ev) {
                ev.preventDefault();
                var $tab = $(ev.target),
                    $sibling = $tab.parent().siblings('li').children('a'),
                    $tab_panel = $($tab.attr('href')),
                    $sibling_panel = $($sibling.attr('href'));

                $sibling_panel.fadeOut('fast', function () {
                    $sibling.removeClass('current');
                    $tab.addClass('current');
                    $tab_panel.fadeIn('fast', function () {
                    });
                });
            },

            showHelpMessages: function (msgs) {
                // Override showHelpMessages in ChatBoxView, for now do nothing.
                return;
            },

            render: function () {
                if ((!converse.prebind) && (!converse.connection)) {
                    // Add login panel if the user still has to authenticate
                    this.$el.html(this.template(this.model.toJSON()));
                    this.loginpanel = new converse.LoginPanel({'$parent': this.$el.find('.controlbox-panes'), 'model': this});
                    this.loginpanel.render();
                } else if (!this.contactspanel) {
                    this.$el.html(this.template(this.model.toJSON()));
                    this.contactspanel = new converse.ContactsPanel({'$parent': this.$el.find('.controlbox-panes')});
                    this.contactspanel.render();
                    converse.xmppstatusview = new converse.XMPPStatusView({'model': converse.xmppstatus});
                    converse.xmppstatusview.render();
                    if (converse.allow_muc) {
                        this.roomspanel = new converse.RoomsPanel({'$parent': this.$el.find('.controlbox-panes')});
                        this.roomspanel.render();
                    }
                }
                return this;
            }
        });

        this.ChatRoomView = converse.ChatBoxView.extend({
            length: 300,
            tagName: 'div',
            className: 'chatroom',
            events: {
                'click a.close-chatbox-button': 'closeChat',
                'click a.configure-chatroom-button': 'configureChatRoom',
                'click .toggle-smiley': 'toggleEmoticonMenu',
                'click .toggle-smiley ul li': 'insertEmoticon',
                'keypress textarea.chat-textarea': 'keyPressed'
            },
            info_template: _.template('<div class="chat-info">{{message}}</div>'),
            is_chatroom: true,

            sendChatRoomMessage: function (body) {
                var match = body.replace(/^\s*/, "").match(/^\/(.*?)(?: (.*))?$/) || [false],
                    $chat_content;
                switch (match[1]) {
                    case 'msg':
                        // TODO: Private messages
                        break;
                    case 'clear':
                        this.$el.find('.chat-content').empty();
                        break;
                    case 'topic':
                        converse.connection.muc.setTopic(this.model.get('jid'), match[2]);
                        break;
                    case 'kick':
                        converse.connection.muc.kick(this.model.get('jid'), match[2]);
                        break;
                    case 'ban':
                        converse.connection.muc.ban(this.model.get('jid'), match[2]);
                        break;
                    case 'op':
                        converse.connection.muc.op(this.model.get('jid'), match[2]);
                        break;
                    case 'deop':
                        converse.connection.muc.deop(this.model.get('jid'), match[2]);
                        break;
                    case 'help':
                        $chat_content = this.$el.find('.chat-content');
                        msgs = [
                            '<strong>/help</strong>:'+__('Show this menu')+'',
                            '<strong>/me</strong>:'+__('Write in the third person')+'',
                            '<strong>/topic</strong>:'+__('Set chatroom topic')+'',
                            '<strong>/kick</strong>:'+__('Kick user from chatroom')+'',
                            '<strong>/ban</strong>:'+__('Ban user from chatroom')+'',
                            '<strong>/clear</strong>:'+__('Remove messages')+''
                            ];
                        this.showHelpMessages(msgs);
                        break;
                    default:
                        this.last_msgid = converse.connection.muc.groupchat(this.model.get('jid'), body);
                    break;
                }
            },

            template: _.template(
                '<div class="chat-head chat-head-chatroom">' +
                    '<a class="close-chatbox-button icon-close"></a>' +
                    '<a class="configure-chatroom-button icon-wrench" style="display:none"></a>' +
                    '<div class="chat-title"> {{ name }} </div>' +
                    '<p class="chatroom-topic"><p/>' +
                '</div>' +
                '<div class="chat-body">' +
                '<span class="spinner centered"/>' +
                '</div>'),

            chatarea_template: _.template(
                '<div class="chat-area">' +
                    '<div class="chat-content"></div>' +
                    '<form class="sendXMPPMessage" action="" method="post">' +
                        '{[ if ('+converse.show_toolbar+') { ]}' +
                            '<ul class="chat-toolbar no-text-select"></ul>'+
                        '{[ } ]}' +
                        '<textarea type="text" class="chat-textarea" ' +
                            'placeholder="'+__('Message')+'"/>' +
                    '</form>' +
                '</div>' +
                '<div class="participants">' +
                    '<ul class="participant-list"></ul>' +
                '</div>'
            ),

            render: function () {
                this.$el.attr('id', this.model.get('box_id'))
                        .html(this.template(this.model.toJSON()));
                return this;
            },

            renderChatArea: function () {
                if (!this.$el.find('.chat-area').length) {
                    this.$el.find('.chat-body').empty().append(this.chatarea_template());
                    this.renderToolbar();
                }
                return this;
            },

            connect: function (password) {
                if (_.has(converse.connection.muc.rooms, this.model.get('jid'))) {
                    // If the room exists, it already has event listeners, so we
                    // doing add them again.
                    converse.connection.muc.join(
                        this.model.get('jid'), this.model.get('nick'), null, null, null, password);
                } else {
                    converse.connection.muc.join(
                        this.model.get('jid'),
                        this.model.get('nick'),
                        $.proxy(this.onChatRoomMessage, this),
                        $.proxy(this.onChatRoomPresence, this),
                        $.proxy(this.onChatRoomRoster, this),
                        password);
                }
            },

            initialize: function () {
                this.connect(null);
                this.model.messages.on('add', this.onMessageAdded, this);
                this.model.on('destroy', function (model, response, options) {
                    this.hide();
                    converse.connection.muc.leave(
                        this.model.get('jid'),
                        this.model.get('nick'),
                        $.proxy(this.onLeave, this),
                        undefined);
                },
                this);
                this.$el.appendTo(converse.chatboxesview.$el);
                this.render().show().model.messages.fetch({add: true});
            },

            onLeave: function () {
                this.model.set('connected', false);
            },

            form_input_template: _.template('<label>{{label}}<input name="{{name}}" type="{{type}}" value="{{value}}"></label>'),
            select_option_template: _.template('<option value="{{value}}">{{label}}</option>'),
            form_select_template: _.template('<label>{{label}}<select name="{{name}}">{{options}}</select></label>'),
            form_checkbox_template: _.template('<label>{{label}}<input name="{{name}}" type="{{type}}" {{checked}}"></label>'),

            renderConfigurationForm: function (stanza) {
                var $form= this.$el.find('form.chatroom-form'),
                    $stanza = $(stanza),
                    $fields = $stanza.find('field'),
                    title = $stanza.find('title').text(),
                    instructions = $stanza.find('instructions').text(),
                    i, j, options=[];
                var input_types = {
                    'text-private': 'password',
                    'text-single': 'textline',
                    'boolean': 'checkbox',
                    'hidden': 'hidden',
                    'list-single': 'dropdown'
                };
                $form.find('span.spinner').remove();
                $form.append($('<legend>').text(title));
                if (instructions != title) {
                    $form.append($('<p>').text(instructions));
                }
                for (i=0; i<$fields.length; i++) {
                    $field = $($fields[i]);
                    if ($field.attr('type') == 'list-single') {
                        options = [];
                        $options = $field.find('option');
                        for (j=0; j<$options.length; j++) {
                            options.push(this.select_option_template({
                                value: $($options[j]).find('value').text(),
                                label: $($options[j]).attr('label')
                            }));
                        }
                        $form.append(this.form_select_template({
                            name: $field.attr('var'),
                            label: $field.attr('label'),
                            options: options.join('')
                        }));
                    } else if ($field.attr('type') == 'boolean') {
                        $form.append(this.form_checkbox_template({
                            name: $field.attr('var'),
                            type: input_types[$field.attr('type')],
                            label: $field.attr('label') || '',
                            checked: $field.find('value').text() === "1" && 'checked="1"' || ''
                        }));
                    } else {
                        $form.append(this.form_input_template({
                            name: $field.attr('var'),
                            type: input_types[$field.attr('type')],
                            label: $field.attr('label') || '',
                            value: $field.find('value').text()
                        }));
                    }
                }
                $form.append('<input type="submit" value="'+__('Save')+'"/>');
                $form.append('<input type="button" value="'+__('Cancel')+'"/>');
                $form.on('submit', $.proxy(this.saveConfiguration, this));
                $form.find('input[type=button]').on('click', $.proxy(this.cancelConfiguration, this));
            },

            field_template: _.template('<field var="{{name}}"><value>{{value}}</value></field>'),

            saveConfiguration: function (ev) {
                ev.preventDefault();
                var that = this;
                var $inputs = $(ev.target).find(':input:not([type=button]):not([type=submit])'),
                    count = $inputs.length,
                    configArray = [];
                $inputs.each(function () {
                    var $input = $(this), value;
                    if ($input.is('[type=checkbox]')) {
                        value = $input.is(':checked') && 1 || 0;
                    } else {
                        value = $input.val();
                    }
                    var cnode = $(that.field_template({
                        name: $input.attr('name'),
                        value: value
                    }))[0];
                    configArray.push(cnode);
                    if (!--count) {
                        converse.connection.muc.saveConfiguration(
                            that.model.get('jid'),
                            configArray,
                            $.proxy(that.onConfigSaved, that),
                            $.proxy(that.onErrorConfigSaved, that)
                        );
                    }
                });
                this.$el.find('div.chatroom-form-container').hide(
                    function () {
                        $(this).remove();
                        that.$el.find('.chat-area').show();
                        that.$el.find('.participants').show();
                    });
            },

            onConfigSaved: function (stanza) {
                // XXX
            },

            onErrorConfigSaved: function (stanza) {
                this.showStatusNotification(__("An error occurred while trying to save the form."));
            },

            cancelConfiguration: function (ev) {
                ev.preventDefault();
                var that = this;
                this.$el.find('div.chatroom-form-container').hide(
                    function () {
                        $(this).remove();
                        that.$el.find('.chat-area').show();
                        that.$el.find('.participants').show();
                    });
            },

            configureChatRoom: function (ev) {
                ev.preventDefault();
                if (this.$el.find('div.chatroom-form-container').length) {
                    return;
                }
                this.$el.find('.chat-area').hide();
                this.$el.find('.participants').hide();
                this.$el.find('.chat-body').append(
                    $('<div class="chatroom-form-container">'+
                        '<form class="chatroom-form">'+
                        '<span class="spinner centered"/>'+
                        '</form>'+
                    '</div>'));
                converse.connection.muc.configure(
                    this.model.get('jid'),
                    $.proxy(this.renderConfigurationForm, this)
                );
            },

            submitPassword: function (ev) {
                ev.preventDefault();
                var password = this.$el.find('.chatroom-form').find('input[type=password]').val();
                this.$el.find('.chatroom-form-container').replaceWith(
                    '<span class="spinner centered"/>');
                this.connect(password);
            },

            renderPasswordForm: function () {
                this.$el.find('span.centered.spinner').remove();
                this.$el.find('.chat-body').append(
                    $('<div class="chatroom-form-container">'+
                        '<form class="chatroom-form">'+
                            '<legend>'+__('This chatroom requires a password')+'</legend>' +
                            '<label>'+__('Password: ')+'<input type="password" name="password"/></label>' +
                            '<input type="submit" value="'+__('Submit')+'/>' +
                        '</form>'+
                    '</div>'));
                this.$el.find('.chatroom-form').on('submit', $.proxy(this.submitPassword, this));
            },

            showDisconnectMessage: function (msg) {
                this.$el.find('.chat-area').remove();
                this.$el.find('.participants').remove();
                this.$el.find('span.centered.spinner').remove();
                this.$el.find('.chat-body').append($('<p>'+msg+'</p>'));
            },

            infoMessages: {
                100: __('This room is not anonymous'),
                102: __('This room now shows unavailable members'),
                103: __('This room does not show unavailable members'),
                104: __('Non-privacy-related room configuration has changed'),
                170: __('Room logging is now enabled'),
                171: __('Room logging is now disabled'),
                172: __('This room is now non-anonymous'),
                173: __('This room is now semi-anonymous'),
                174: __('This room is now fully-anonymous'),
                201: __('A new room has been created'),
                210: __('Your nickname has been changed')
            },

            actionInfoMessages: {
                /* XXX: Note the triple underscore function and not double
                 * underscore.
                 *
                 * This is a hack. We can't pass the strings to __ because we
                 * don't yet know what the variable to interpolate is.
                 *
                 * Triple underscore will just return the string again, but we
                 * can then at least tell gettext to scan for it so that these
                 * strings are picked up by the translation machinery.
                 */
                301: ___("<strong>%1$s</strong> has been banned"),
                307: ___("<strong>%1$s</strong> has been kicked out"),
                321: ___("<strong>%1$s</strong> has been removed because of an affiliation change"),
                322: ___("<strong>%1$s</strong> has been removed for not being a member")
            },

            disconnectMessages: {
                301: __('You have been banned from this room'),
                307: __('You have been kicked from this room'),
                321: __("You have been removed from this room because of an affiliation change"),
                322: __("You have been removed from this room because the room has changed to members-only and you're not a member"),
                332: __("You have been removed from this room because the MUC (Multi-user chat) service is being shut down.")
            },

            showStatusMessages: function ($el, is_self) {
                /* Check for status codes and communicate their purpose to the user
                * See: http://xmpp.org/registrar/mucstatus.html
                */
                var $chat_content = this.$el.find('.chat-content'),
                    $stats = $el.find('status'),
                    disconnect_msgs = [],
                    info_msgs = [],
                    action_msgs = [],
                    msgs, i;
                for (i=0; i<$stats.length; i++) {
                    var stat = $stats[i].getAttribute('code');
                    if (is_self) {
                        if (_.contains(_.keys(this.disconnectMessages), stat)) {
                            disconnect_msgs.push(this.disconnectMessages[stat]);
                        }
                    } else {
                        if (_.contains(_.keys(this.infoMessages), stat)) {
                            info_msgs.push(this.infoMessages[stat]);
                        } else if (_.contains(_.keys(this.actionInfoMessages), stat)) {
                            action_msgs.push(
                                __(this.actionInfoMessages[stat], Strophe.unescapeNode(Strophe.getResourceFromJid($el.attr('from'))))
                            );
                        }
                    }
                }
                if (disconnect_msgs.length > 0) {
                    for (i=0; i<disconnect_msgs.length; i++) {
                        this.showDisconnectMessage(disconnect_msgs[i]);
                    }
                    this.model.set('connected', false);
                    return;
                }
                this.renderChatArea();
                for (i=0; i<info_msgs.length; i++) {
                    $chat_content.append(this.info_template({message: info_msgs[i]}));
                }
                for (i=0; i<action_msgs.length; i++) {
                    $chat_content.append(this.info_template({message: action_msgs[i]}));
                }
                return this.scrollDown();
            },

            showErrorMessage: function ($error, room) {
                // We didn't enter the room, so we must remove it from the MUC
                // add-on
                delete converse.connection.muc[room.name];
                if ($error.attr('type') == 'auth') {
                    if ($error.find('not-authorized').length) {
                        this.renderPasswordForm();
                    } else if ($error.find('registration-required').length) {
                        this.showDisconnectMessage(__('You are not on the member list of this room'));
                    } else if ($error.find('forbidden').length) {
                        this.showDisconnectMessage(__('You have been banned from this room'));
                    }
                } else if ($error.attr('type') == 'modify') {
                    if ($error.find('jid-malformed').length) {
                        this.showDisconnectMessage(__('No nickname was specified'));
                    }
                } else if ($error.attr('type') == 'cancel') {
                    if ($error.find('not-allowed').length) {
                        this.showDisconnectMessage(__('You are not allowed to create new rooms'));
                    } else if ($error.find('not-acceptable').length) {
                        this.showDisconnectMessage(__("Your nickname doesn't conform to this room's policies"));
                    } else if ($error.find('conflict').length) {
                        this.showDisconnectMessage(__("Your nickname is already taken"));
                    } else if ($error.find('item-not-found').length) {
                        this.showDisconnectMessage(__("This room does not (yet) exist"));
                    } else if ($error.find('service-unavailable').length) {
                        this.showDisconnectMessage(__("This room has reached it's maximum number of occupants"));
                    }
                }
            },

            onChatRoomPresence: function (presence, room) {
                var nick = room.nick,
                    $presence = $(presence),
                    from = $presence.attr('from'),
                    is_self = ($presence.find("status[code='110']").length) || (from == room.name+'/'+Strophe.escapeNode(nick)),
                    $item;

                if ($presence.attr('type') === 'error') {
                    this.model.set('connected', false);
                    this.showErrorMessage($presence.find('error'), room);
                } else {
                    this.model.set('connected', true);
                    this.showStatusMessages($presence, is_self);
                    if (!this.model.get('connected')) {
                        return true;
                    }
                    if ($presence.find("status[code='201']").length) {
                        // This is a new chatroom. We create an instant
                        // chatroom, and let the user manually set any
                        // configuration setting.
                        converse.connection.muc.createInstantRoom(room.name);
                    }
                    if (is_self) {
                        $item = $presence.find('item');
                        if ($item.length) {
                            if ($item.attr('affiliation') == 'owner') {
                                this.$el.find('a.configure-chatroom-button').show();
                            }
                        }
                        if ($presence.find("status[code='210']").length) {
                            // check if server changed our nick
                            this.model.set({'nick': Strophe.getResourceFromJid(from)});
                        }
                    }
                }
                return true;
            },

            onChatRoomMessage: function (message) {
                var $message = $(message),
                    body = $message.children('body').text(),
                    jid = $message.attr('from'),
                    $chat_content = this.$el.find('.chat-content'),
                    resource = Strophe.getResourceFromJid(jid),
                    sender = resource && Strophe.unescapeNode(resource) || '',
                    delayed = $message.find('delay').length > 0,
                    subject = $message.children('subject').text(),
                    match, template, message_datetime, message_date, dates, isodate, stamp;

                if (delayed) {
                    stamp = $message.find('delay').attr('stamp');
                    message_datetime = converse.parseISO8601(stamp);
                } else {
                    message_datetime = new Date();
                }
                // If this message is on a different day than the one received
                // prior, then indicate it on the chatbox.
                dates = $chat_content.find("time").map(function(){return $(this).attr("datetime");}).get();
                message_date = new Date(message_datetime.getTime());
                message_date.setUTCHours(0,0,0,0);
                isodate = converse.toISOString(message_date);
                if (_.indexOf(dates, isodate) == -1) {
                    $chat_content.append(this.new_day_template({
                        isodate: isodate,
                        datestring: message_date.toString().substring(0,15)
                    }));
                }
                this.showStatusMessages($message);
                if (subject) {
                    this.$el.find('.chatroom-topic').text(subject).attr('title', subject);
                    // # For translators: the %1$s and %2$s parts will get replaced by the user and topic text respectively
                    // # Example: Topic set by JC Brand to: Hello World!
                    $chat_content.append(
                        this.info_template({
                            'message': __('Topic set by %1$s to: %2$s', sender, subject)
                        }));
                }
                if (!body) { return true; }
                var display_sender = sender === this.model.get('nick') && 'me' || 'room';
                this.showMessage({
                    'message': body,
                    'sender': display_sender,
                    'fullname': sender,
                    'time': converse.toISOString(message_datetime)
                });
                if (display_sender === 'room') {
                    // We only emit an event if it's not our own message
                    converse.emit('onMessage', message);
                }
                return true;
            },

            occupant_template: _.template(
                '<li class="{{role}}" '+
                    '{[ if (role === "moderator") { ]}' +
                        'title="'+__('This user is a moderator')+'"' +
                    '{[ } ]}'+
                    '{[ if (role === "participant") { ]}' +
                        'title="'+__('This user can send messages in this room')+'"' +
                    '{[ } ]}'+
                    '{[ if (role === "visitor") { ]}' +
                        'title="'+__('This user can NOT send messages in this room')+'"' +
                    '{[ } ]}'+
                '>{{nick}}</li>'
            ),

            onChatRoomRoster: function (roster, room) {
                this.renderChatArea();
                var controlboxview = converse.chatboxesview.views.controlbox,
                    roster_size = _.size(roster),
                    $participant_list = this.$el.find('.participant-list'),
                    participants = [], keys = _.keys(roster), i;
                this.$el.find('.participant-list').empty();
                for (i=0; i<roster_size; i++) {
                    participants.push(
                        this.occupant_template({
                            role: roster[keys[i]].role,
                            nick: Strophe.unescapeNode(keys[i])
                        }));
                }
                $participant_list.append(participants.join(""));
                return true;
            }
        });

        this.ChatBoxes = Backbone.Collection.extend({
            model: converse.ChatBox,

            registerMessageHandler: function () {
                converse.connection.addHandler(
                    $.proxy(function (message) {
                        this.onMessage(message);
                        return true;
                    }, this), null, 'message', 'chat');
            },

            onConnected: function () {
                this.localStorage = new Backbone.LocalStorage(
                    hex_sha1('converse.chatboxes-'+converse.bare_jid));
                if (!this.get('controlbox')) {
                    this.add({
                        id: 'controlbox',
                        box_id: 'controlbox'
                    });
                } else {
                    this.get('controlbox').save();
                }
                // This line below will make sure the Roster is set up
                this.get('controlbox').set({connected:true});
                this.registerMessageHandler();
                // Get cached chatboxes from localstorage
                this.fetch({
                    add: true,
                    success: $.proxy(function (collection, resp) {
                        if (_.include(_.pluck(resp, 'id'), 'controlbox')) {
                            // If the controlbox was saved in localstorage, it must be visible
                            this.get('controlbox').set({visible:true}).save();
                        }
                    }, this)
                });
            },

            onMessage: function (message) {
                var buddy_jid, $message = $(message),
                    message_from = $message.attr('from');
                if (message_from == converse.connection.jid) {
                    // FIXME: Forwarded messages should be sent to specific resources,
                    // not broadcasted
                    return true;
                }
                var $forwarded = $message.children('forwarded');
                if ($forwarded.length) {
                    $message = $forwarded.children('message');
                }
                var from = Strophe.getBareJidFromJid(message_from),
                    to = Strophe.getBareJidFromJid($message.attr('to')),
                    resource, chatbox, roster_item;
                if (from == converse.bare_jid) {
                    // I am the sender, so this must be a forwarded message...
                    buddy_jid = to;
                    resource = Strophe.getResourceFromJid($message.attr('to'));
                } else {
                    buddy_jid = from;
                    resource = Strophe.getResourceFromJid(message_from);
                }
                chatbox = this.get(buddy_jid);
                roster_item = converse.roster.get(buddy_jid);

                if (roster_item === undefined) {
                    // The buddy was likely removed
                    converse.log('Could not get roster item for JID '+buddy_jid, 'error');
                    return true;
                }

                if (!chatbox) {
                    var fullname = roster_item.get('fullname');
                    fullname = _.isEmpty(fullname)? buddy_jid: fullname;
                    chatbox = this.create({
                        'id': buddy_jid,
                        'jid': buddy_jid,
                        'fullname': fullname,
                        'image_type': roster_item.get('image_type'),
                        'image': roster_item.get('image'),
                        'url': roster_item.get('url')
                    });
                }
                chatbox.receiveMessage(message);
                converse.roster.addResource(buddy_jid, resource);
                converse.emit('onMessage', message);
                return true;
            }
        });

        this.ChatBoxesView = Backbone.View.extend({
            el: '#conversejs',

            initialize: function () {
                // boxesviewinit
                this.views = {};
                this.model.on("add", function (item) {
                    var view = this.views[item.get('id')];
                    if (!view) {
                        if (item.get('chatroom')) {
                            view = new converse.ChatRoomView({'model': item});
                        } else if (item.get('box_id') === 'controlbox') {
                            view = new converse.ControlBoxView({model: item});
                            view.render();
                        } else {
                            view = new converse.ChatBoxView({model: item});
                        }
                        this.views[item.get('id')] = view;
                    } else {
                        delete view.model; // Remove ref to old model to help garbage collection
                        view.model = item;
                        view.initialize();
                        if (item.get('id') !== 'controlbox') {
                            // XXX: Why is it necessary to again append chatboxes?
                            view.$el.appendTo(this.$el);
                        }
                    }
                }, this);
            },

            showChatBox: function (attrs) {
                var chatbox  = this.model.get(attrs.jid);
                if (chatbox) {
                    chatbox.trigger('show');
                } else {
                    chatbox = this.model.create(attrs, {
                        'error': function (model, response) {
                            converse.log(response.responseText);
                        }
                    });
                }
                return chatbox;
            }
        });

        this.RosterItem = Backbone.Model.extend({
            initialize: function (attributes, options) {
                var jid = attributes.jid;
                if (!attributes.fullname) {
                    attributes.fullname = jid;
                }
                var attrs = _.extend({
                    'id': jid,
                    'user_id': Strophe.getNodeFromJid(jid),
                    'resources': [],
                    'status': ''
                }, attributes);
                attrs.sorted = false;
                attrs.chat_status = 'offline';
                this.set(attrs);
            }
        });

        this.RosterItemView = Backbone.View.extend({
            tagName: 'dd',

            events: {
                "click .accept-xmpp-request": "acceptRequest",
                "click .decline-xmpp-request": "declineRequest",
                "click .open-chat": "openChat",
                "click .remove-xmpp-contact": "removeContact"
            },

            openChat: function (ev) {
                ev.preventDefault();
                converse.chatboxesview.showChatBox({
                    'id': this.model.get('jid'),
                    'jid': this.model.get('jid'),
                    'fullname': this.model.get('fullname'),
                    'image_type': this.model.get('image_type'),
                    'image': this.model.get('image'),
                    'url': this.model.get('url'),
                    'status': this.model.get('status')
                });
            },

            removeContact: function (ev) {
                ev.preventDefault();
                var result = confirm("Are you sure you want to remove this contact?");
                if (result === true) {
                    var bare_jid = this.model.get('jid');
                    converse.connection.roster.remove(bare_jid, function (iq) {
                        converse.connection.roster.unauthorize(bare_jid);
                        converse.rosterview.model.remove(bare_jid);
                    });
                }
            },

            acceptRequest: function (ev) {
                var jid = this.model.get('jid');
                converse.connection.roster.authorize(jid);
                converse.connection.roster.add(jid, this.model.get('fullname'), [], function (iq) {
                    converse.connection.roster.subscribe(jid, null, converse.xmppstatus.get('fullname'));
                });
                ev.preventDefault();
            },

            declineRequest: function (ev) {
                ev.preventDefault();
                converse.connection.roster.unauthorize(this.model.get('jid'));
                this.model.destroy();
            },

            template: _.template(
                '<a class="open-chat" title="'+__('Click to chat with this contact')+'" href="#">'+
                    '<span class="icon-{{ chat_status }}" title="{{ status_desc }}"></span>{{ fullname }}'+
                '</a>' +
                '<a class="remove-xmpp-contact icon-remove" title="'+__('Click to remove this contact')+'" href="#"></a>'),

            pending_template: _.template(
                '<span>{{ fullname }}</span>' +
                '<a class="remove-xmpp-contact icon-remove" title="'+__('Click to remove this contact')+'" href="#"></a>'),

            request_template: _.template('<div>{{ fullname }}</div>' +
                '<button type="button" class="accept-xmpp-request">' +
                'Accept</button>' +
                '<button type="button" class="decline-xmpp-request">' +
                'Decline</button>' +
                ''),

            render: function () {
                var item = this.model,
                    ask = item.get('ask'),
                    requesting  = item.get('requesting'),
                    subscription = item.get('subscription');

                var classes_to_remove = [
                    'current-xmpp-contact',
                    'pending-xmpp-contact',
                    'requesting-xmpp-contact'
                    ].concat(_.keys(STATUSES));

                _.each(classes_to_remove,
                    function (cls) {
                        if (this.el.className.indexOf(cls) !== -1) {
                            this.$el.removeClass(cls);
                        }
                    }, this);

                this.$el.addClass(item.get('chat_status'));

                if (ask === 'subscribe') {
                    this.$el.addClass('pending-xmpp-contact');
                    this.$el.html(this.pending_template(item.toJSON()));
                } else if (requesting === true) {
                    this.$el.addClass('requesting-xmpp-contact');
                    this.$el.html(this.request_template(item.toJSON()));
                    converse.controlboxtoggle.showControlBox();
                } else if (subscription === 'both' || subscription === 'to') {
                    this.$el.addClass('current-xmpp-contact');
                    this.$el.html(this.template(
                        _.extend(item.toJSON(), {'status_desc': STATUSES[item.get('chat_status')||'offline']})
                    ));
                }
                return this;
            }
        });

        this.RosterItems = Backbone.Collection.extend({
            model: converse.RosterItem,
            comparator : function (rosteritem) {
                var chat_status = rosteritem.get('chat_status'),
                    rank = 4;
                switch(chat_status) {
                    case 'offline':
                        rank = 0;
                        break;
                    case 'unavailable':
                        rank = 1;
                        break;
                    case 'xa':
                        rank = 2;
                        break;
                    case 'away':
                        rank = 3;
                        break;
                    case 'dnd':
                        rank = 4;
                        break;
                    case 'online':
                        rank = 5;
                        break;
                }
                return rank;
            },

            subscribeToSuggestedItems: function (msg) {
                $(msg).find('item').each(function () {
                    var $this = $(this),
                        jid = $this.attr('jid'),
                        action = $this.attr('action'),
                        fullname = $this.attr('name');
                    if (action === 'add') {
                        converse.connection.roster.add(jid, fullname, [], function (iq) {
                            converse.connection.roster.subscribe(jid, null, converse.xmppstatus.get('fullname'));
                        });
                    }
                });
                return true;
            },

            isSelf: function (jid) {
                return (Strophe.getBareJidFromJid(jid) === Strophe.getBareJidFromJid(converse.connection.jid));
            },

            addResource: function (bare_jid, resource) {
                var item = this.get(bare_jid),
                    resources;
                if (item) {
                    resources = item.get('resources');
                    if (resources) {
                        if (_.indexOf(resources, resource) == -1) {
                            resources.push(resource);
                            item.set({'resources': resources});
                        }
                    } else  {
                        item.set({'resources': [resource]});
                    }
                }
            },

            removeResource: function (bare_jid, resource) {
                var item = this.get(bare_jid),
                    resources,
                    idx;
                if (item) {
                    resources = item.get('resources');
                    idx = _.indexOf(resources, resource);
                    if (idx !== -1) {
                        resources.splice(idx, 1);
                        item.set({'resources': resources});
                        return resources.length;
                    }
                }
                return 0;
            },

            subscribeBack: function (jid) {
                var bare_jid = Strophe.getBareJidFromJid(jid);
                if (converse.connection.roster.findItem(bare_jid)) {
                    converse.connection.roster.authorize(bare_jid);
                    converse.connection.roster.subscribe(jid, null, converse.xmppstatus.get('fullname'));
                } else {
                    converse.connection.roster.add(jid, '', [], function (iq) {
                        converse.connection.roster.authorize(bare_jid);
                        converse.connection.roster.subscribe(jid, null, converse.xmppstatus.get('fullname'));
                    });
                }
            },

            unsubscribe: function (jid) {
                /* Upon receiving the presence stanza of type "unsubscribed",
                * the user SHOULD acknowledge receipt of that subscription state
                * notification by sending a presence stanza of type "unsubscribe"
                * this step lets the user's server know that it MUST no longer
                * send notification of the subscription state change to the user.
                */
                converse.xmppstatus.sendPresence('unsubscribe');
                if (converse.connection.roster.findItem(jid)) {
                    converse.connection.roster.remove(jid, function (iq) {
                        converse.rosterview.model.remove(jid);
                    });
                }
            },

            getNumOnlineContacts: function () {
                var count = 0,
                    ignored = ['offline', 'unavailable'],
                    models = this.models,
                    models_length = models.length,
                    i;
                if (converse.show_only_online_users) {
                    ignored = _.union(ignored, ['dnd', 'xa', 'away']);
                }
                for (i=0; i<models_length; i++) {
                    if (_.indexOf(ignored, models[i].get('chat_status')) === -1) {
                        count++;
                    }
                }
                return count;
            },

            cleanCache: function (items) {
                /* The localstorage cache containing roster contacts might contain
                * some contacts that aren't actually in our roster anymore. We
                * therefore need to remove them now.
                */
                var id, i,
                    roster_ids = [];
                for (i=0; i < items.length; ++i) {
                    roster_ids.push(items[i].jid);
                }
                for (i=0; i < this.models.length; ++i) {
                    id = this.models[i].get('id');
                    if (_.indexOf(roster_ids, id) === -1) {
                        this.get(id).destroy();
                    }
                }
            },

            rosterHandler: function (items) {
                converse.emit('onRoster', items);
                this.cleanCache(items);
                _.each(items, function (item, index, items) {
                    if (this.isSelf(item.jid)) { return; }
                    var model = this.get(item.jid);
                    if (!model) {
                        var is_last = (index === (items.length-1)) ? true : false;
                        if ((item.subscription === 'none') && (item.ask === null) && !is_last) {
                            // We're not interested in zombies
                            // (Hack: except if it's the last item, then we still
                            // add it so that the roster will be shown).
                            return;
                        }
                        this.create({
                            jid: item.jid,
                            subscription: item.subscription,
                            ask: item.ask,
                            fullname: item.name || item.jid,
                            is_last: is_last
                        });
                    } else {
                        if ((item.subscription === 'none') && (item.ask === null)) {
                            // This user is no longer in our roster
                            model.destroy();
                        } else if (model.get('subscription') !== item.subscription || model.get('ask') !== item.ask) {
                            // only modify model attributes if they are different from the
                            // ones that were already set when the rosterItem was added
                            model.set({'subscription': item.subscription, 'ask': item.ask, 'requesting': null});
                            model.save();
                        }
                    }
                }, this);

                if (!converse.initial_presence_sent) {
                    /* Once we've sent out our initial presence stanza, we'll
                     * start receiving presence stanzas from our contacts.
                     * We therefore only want to do this after our roster has
                     * been set up (otherwise we can't meaningfully process
                     * incoming presence stanzas).
                     */
                    converse.initial_presence_sent = 1;
                    converse.xmppstatus.sendPresence();
                }
            },

            handleIncomingSubscription: function (jid) {
                var bare_jid = Strophe.getBareJidFromJid(jid);
                var item = this.get(bare_jid);

                if (!converse.allow_contact_requests) {
                    converse.connection.roster.unauthorize(bare_jid);
                    return true;
                }
                if (converse.auto_subscribe) {
                    if ((!item) || (item.get('subscription') != 'to')) {
                        this.subscribeBack(jid);
                    } else {
                        converse.connection.roster.authorize(bare_jid);
                    }
                } else {
                    if ((item) && (item.get('subscription') != 'none'))  {
                        converse.connection.roster.authorize(bare_jid);
                    } else {
                        if (!this.get(bare_jid)) {
                            converse.getVCard(
                                bare_jid,
                                $.proxy(function (jid, fullname, img, img_type, url) {
                                    this.add({
                                        jid: bare_jid,
                                        subscription: 'none',
                                        ask: null,
                                        requesting: true,
                                        fullname: fullname,
                                        image: img,
                                        image_type: img_type,
                                        url: url,
                                        vcard_updated: converse.toISOString(new Date()),
                                        is_last: true
                                    });
                                }, this),
                                $.proxy(function (jid, fullname, img, img_type, url) {
                                    converse.log("Error while retrieving vcard");
                                    // XXX: Should vcard_updated be set here as well?
                                    this.add({
                                        jid: bare_jid,
                                        subscription: 'none',
                                        ask: null,
                                        requesting: true,
                                        fullname: jid,
                                        is_last: true
                                    });
                                }, this)
                            );
                        } else {
                            return true;
                        }
                    }
                }
                return true;
            },

            presenceHandler: function (presence) {
                var $presence = $(presence),
                    presence_type = $presence.attr('type');
                if (presence_type === 'error') {
                    return true;
                }
                var jid = $presence.attr('from'),
                    bare_jid = Strophe.getBareJidFromJid(jid),
                    resource = Strophe.getResourceFromJid(jid),
                    $show = $presence.find('show'),
                    chat_status = $show.text() || 'online',
                    status_message = $presence.find('status'),
                    item;

                if (this.isSelf(bare_jid)) {
                    if ((converse.connection.jid !== jid)&&(presence_type !== 'unavailable')) {
                        // Another resource has changed it's status, we'll update ours as well.
                        // FIXME: We should ideally differentiate between converse.js using
                        // resources and other resources (i.e Pidgin etc.)
                        converse.xmppstatus.save({'status': chat_status});
                    }
                    return true;
                } else if (($presence.find('x').attr('xmlns') || '').indexOf(Strophe.NS.MUC) === 0) {
                    return true; // Ignore MUC
                }
                item = this.get(bare_jid);
                if (item && (status_message.text() != item.get('status'))) {
                    item.save({'status': status_message.text()});
                }
                if ((presence_type === 'subscribed') || (presence_type === 'unsubscribe')) {
                    return true;
                } else if (presence_type === 'subscribe') {
                    return this.handleIncomingSubscription(jid);
                } else if (presence_type === 'unsubscribed') {
                    this.unsubscribe(bare_jid);
                } else if (presence_type === 'unavailable') {
                    if (this.removeResource(bare_jid, resource) === 0) {
                        if (item) {
                            item.set({'chat_status': 'offline'});
                        }
                    }
                } else if (item) {
                    // presence_type is undefined
                    this.addResource(bare_jid, resource);
                    item.set({'chat_status': chat_status});
                }
                return true;
            }
        });

        this.RosterView = Backbone.View.extend({
            tagName: 'dl',
            id: 'converse-roster',
            rosteritemviews: {},

            requesting_contacts_template: _.template(
                '<dt id="xmpp-contact-requests">'+__('Contact requests')+'</dt>'),

            contacts_template: _.template(
                '<dt id="xmpp-contacts">'+__('My contacts')+'</dt>'),

            pending_contacts_template: _.template(
                '<dt id="pending-xmpp-contacts">'+__('Pending contacts')+'</dt>'),

            initialize: function () {
                this.model.on("add", function (item) {
                    this.addRosterItemView(item).render(item);
                    if (!item.get('vcard_updated')) {
                        // This will update the vcard, which triggers a change
                        // request which will rerender the roster item.
                        converse.getVCard(item.get('jid'));
                    }
                }, this);

                this.model.on('change', function (item) {
                    if ((_.size(item.changed) === 1) && _.contains(_.keys(item.changed), 'sorted')) {
                        return;
                    }
                    this.updateChatBox(item).render(item);
                }, this);

                this.model.on("remove", function (item) { this.removeRosterItemView(item); }, this);
                this.model.on("destroy", function (item) { this.removeRosterItemView(item); }, this);

                var roster_markup = this.contacts_template();
                if (converse.allow_contact_requests) {
                    roster_markup = this.requesting_contacts_template() + roster_markup + this.pending_contacts_template();
                }
                this.$el.hide().html(roster_markup);

                this.model.fetch({add: true}); // Get the cached roster items from localstorage
            },

            updateChatBox: function (item, changed) {
                var chatbox = converse.chatboxes.get(item.get('jid')),
                    changes = {};
                if (!chatbox) {
                    return this;
                }
                if (_.has(item.changed, 'chat_status')) {
                    changes.chat_status = item.get('chat_status');
                }
                if (_.has(item.changed, 'status')) {
                    changes.status = item.get('status');
                }
                chatbox.save(changes);
                return this;
            },

            addRosterItemView: function (item) {
                var view = new converse.RosterItemView({model: item});
                this.rosteritemviews[item.id] = view;
                return this;
            },

            removeRosterItemView: function (item) {
                var view = this.rosteritemviews[item.id];
                if (view) {
                    view.$el.remove();
                    delete this.rosteritemviews[item.id];
                    this.render();
                }
                return this;
            },

            renderRosterItem: function (item, view) {
                if ((converse.show_only_online_users) && (item.get('chat_status') !== 'online')) {
                    view.$el.remove();
                    view.delegateEvents();
                    return this;
                }
                if ($.contains(document.documentElement, view.el)) {
                    view.render();
                } else {
                    this.$el.find('#xmpp-contacts').after(view.render().el);
                }
            },

            render: function (item) {
                var $my_contacts = this.$el.find('#xmpp-contacts'),
                    $contact_requests = this.$el.find('#xmpp-contact-requests'),
                    $pending_contacts = this.$el.find('#pending-xmpp-contacts'),
                    sorted = false,
                    $count, changed_presence;
                if (item) {
                    var jid = item.id,
                        view = this.rosteritemviews[item.id],
                        ask = item.get('ask'),
                        subscription = item.get('subscription'),
                        requesting  = item.get('requesting'),
                        crit = {order:'asc'};

                    if ((ask === 'subscribe') && (subscription == 'none')) {
                        $pending_contacts.after(view.render().el);
                        $pending_contacts.after($pending_contacts.siblings('dd.pending-xmpp-contact').tsort(crit));
                    } else if ((ask === 'subscribe') && (subscription == 'from')) {
                        // TODO: We have accepted an incoming subscription
                        // request and (automatically) made our own subscription request back.
                        // It would be useful to update the roster here to show
                        // things are happening... (see docs/DEVELOPER.rst)
                        $pending_contacts.after(view.render().el);
                        $pending_contacts.after($pending_contacts.siblings('dd.pending-xmpp-contact').tsort(crit));
                    } else if (requesting === true) {
                        $contact_requests.after(view.render().el);
                        $contact_requests.after($contact_requests.siblings('dd.requesting-xmpp-contact').tsort(crit));
                    } else if (subscription === 'both' || subscription === 'to') {
                        this.renderRosterItem(item, view);
                    }
                    changed_presence = item.changed.chat_status;
                    if (changed_presence) {
                        this.sortRoster(changed_presence);
                        sorted = true;
                    }
                    if (item.get('is_last')) {
                        if (!sorted) {
                            this.sortRoster(item.get('chat_status'));
                        }
                        if (!this.$el.is(':visible')) {
                            // Once all initial roster items have been added, we
                            // can show the roster.
                            this.$el.show();
                        }
                    }
                }
                // Hide the headings if there are no contacts under them
                _.each([$my_contacts, $contact_requests, $pending_contacts], function (h) {
                    if (h.nextUntil('dt').length) {
                        if (!h.is(':visible')) {
                            h.show();
                        }
                    }
                    else if (h.is(':visible')) {
                        h.hide();
                    }
                });
                $count = $('#online-count');
                $count.text('('+this.model.getNumOnlineContacts()+')');
                if (!$count.is(':visible')) {
                    $count.show();
                }
                converse.emit('onRosterViewUpdated');
                return this;
            },

            sortRoster: function (chat_status) {
                var $my_contacts = this.$el.find('#xmpp-contacts');
                $my_contacts.siblings('dd.current-xmpp-contact.'+chat_status).tsort('a', {order:'asc'});
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.offline'));
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.unavailable'));
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.xa'));
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.away'));
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.dnd'));
                $my_contacts.after($my_contacts.siblings('dd.current-xmpp-contact.online'));
            }
        });

        this.XMPPStatus = Backbone.Model.extend({
            initialize: function () {
                this.set({
                    'status' : this.get('status') || 'online'
                });
                this.on('change', $.proxy(function (item) {
                    if (this.get('fullname') === undefined) {
                        converse.getVCard(
                            null, // No 'to' attr when getting one's own vCard
                            $.proxy(function (jid, fullname, image, image_type, url) {
                                this.save({'fullname': fullname});
                            }, this)
                        );
                    }
                    if (_.has(item.changed, 'status')) {
                        converse.emit('onStatusChanged', this.get('status'));
                    }
                    if (_.has(item.changed, 'status_message')) {
                        converse.emit('onStatusMessageChanged', this.get('status_message'));
                    }
                }, this));
            },

            sendPresence: function (type) {
                if (type === undefined) {
                    type = this.get('status') || 'online';
                }
                var status_message = this.get('status_message'),
                    presence;
                // Most of these presence types are actually not explicitly sent,
                // but I add all of them here fore reference and future proofing.
                if ((type === 'unavailable') ||
                        (type === 'probe') ||
                        (type === 'error') ||
                        (type === 'unsubscribe') ||
                        (type === 'unsubscribed') ||
                        (type === 'subscribe') ||
                        (type === 'subscribed')) {
                    presence = $pres({'type':type});
                } else {
                    if (type === 'online') {
                        presence = $pres();
                    } else {
                        presence = $pres().c('show').t(type).up();
                    }
                    if (status_message) {
                        presence.c('status').t(status_message);
                    }
                }
                converse.connection.send(presence);
            },

            setStatus: function (value) {
                this.sendPresence(value);
                this.save({'status': value});
            },

            setStatusMessage: function (status_message) {
                converse.connection.send($pres().c('show').t(this.get('status')).up().c('status').t(status_message));
                this.save({'status_message': status_message});
                if (this.xhr_custom_status) {
                    $.ajax({
                        url:  this.xhr_custom_status_url,
                        type: 'POST',
                        data: {'msg': status_message}
                    });
                }
            }
        });

        this.XMPPStatusView = Backbone.View.extend({
            el: "span#xmpp-status-holder",

            events: {
                "click a.choose-xmpp-status": "toggleOptions",
                "click #fancy-xmpp-status-select a.change-xmpp-status-message": "renderStatusChangeForm",
                "submit #set-custom-xmpp-status": "setStatusMessage",
                "click .dropdown dd ul li a": "setStatus"
            },

            toggleOptions: function (ev) {
                ev.preventDefault();
                $(ev.target).parent().parent().siblings('dd').find('ul').toggle('fast');
            },

            change_status_message_template: _.template(
                '<form id="set-custom-xmpp-status">' +
                    '<input type="text" class="custom-xmpp-status" {{ status_message }}"'+
                        'placeholder="'+__('Custom status')+'"/>' +
                    '<button type="submit">'+__('Save')+'</button>' +
                '</form>'),

            status_template: _.template(
                '<div class="xmpp-status">' +
                    '<a class="choose-xmpp-status {{ chat_status }}" data-value="{{status_message}}" href="#" title="'+__('Click to change your chat status')+'">' +
                        '<span class="icon-{{ chat_status }}"></span>'+
                        '{{ status_message }}' +
                    '</a>' +
                    '<a class="change-xmpp-status-message icon-pencil" href="#" title="'+__('Click here to write a custom status message')+'"></a>' +
                '</div>'),

            renderStatusChangeForm: function (ev) {
                ev.preventDefault();
                var status_message = this.model.get('status') || 'offline';
                var input = this.change_status_message_template({'status_message': status_message});
                this.$el.find('.xmpp-status').replaceWith(input);
                this.$el.find('.custom-xmpp-status').focus().focus();
            },

            setStatusMessage: function (ev) {
                ev.preventDefault();
                var status_message = $(ev.target).find('input').val();
                if (status_message === "") {
                }
                this.model.setStatusMessage(status_message);
            },

            setStatus: function (ev) {
                ev.preventDefault();
                var $el = $(ev.target),
                    value = $el.attr('data-value');
                this.model.setStatus(value);
                this.$el.find(".dropdown dd ul").hide();
            },

            getPrettyStatus: function (stat) {
                if (stat === 'chat') {
                    pretty_status = __('online');
                } else if (stat === 'dnd') {
                    pretty_status = __('busy');
                } else if (stat === 'xa') {
                    pretty_status = __('away for long');
                } else if (stat === 'away') {
                    pretty_status = __('away');
                } else {
                    pretty_status = __(stat) || __('online');
                }
                return pretty_status;
            },

            updateStatusUI: function (model) {
                if (!(_.has(model.changed, 'status')) && !(_.has(model.changed, 'status_message'))) {
                    return;
                }
                var stat = model.get('status');
                // # For translators: the %1$s part gets replaced with the status
                // # Example, I am online
                var status_message = model.get('status_message') || __("I am %1$s", this.getPrettyStatus(stat));
                this.$el.find('#fancy-xmpp-status-select').html(
                    this.status_template({
                        'chat_status': stat,
                        'status_message': status_message
                    }));
            },

            choose_template: _.template(
                '<dl id="target" class="dropdown">' +
                    '<dt id="fancy-xmpp-status-select" class="fancy-dropdown"></dt>' +
                    '<dd><ul class="xmpp-status-menu"></ul></dd>' +
                '</dl>'),

            option_template: _.template(
                '<li>' +
                    '<a href="#" class="{{ value }}" data-value="{{ value }}">'+
                        '<span class="icon-{{ value }}"></span>'+
                        '{{ text }}'+
                    '</a>' +
                '</li>'),

            initialize: function () {
                this.model.on("change", this.updateStatusUI, this);
            },

            render: function () {
                // Replace the default dropdown with something nicer
                var $select = this.$el.find('select#select-xmpp-status'),
                    chat_status = this.model.get('status') || 'offline',
                    options = $('option', $select),
                    $options_target,
                    options_list = [],
                    that = this;
                this.$el.html(this.choose_template());
                this.$el.find('#fancy-xmpp-status-select')
                        .html(this.status_template({
                            'status_message': this.model.get('status_message') || __("I am %1$s", this.getPrettyStatus(chat_status)),
                            'chat_status': chat_status
                            }));
                // iterate through all the <option> elements and add option values
                options.each(function(){
                    options_list.push(that.option_template({'value': $(this).val(),
                                                            'text': this.text
                                                            }));
                });
                $options_target = this.$el.find("#target dd ul").hide();
                $options_target.append(options_list.join(''));
                $select.remove();
                return this;
            }
        });

        this.Feature = Backbone.Model.extend();
        this.Features = Backbone.Collection.extend({
            /* Service Discovery
            * -----------------
            * This collection stores Feature Models, representing features
            * provided by available XMPP entities (e.g. servers)
            * See XEP-0030 for more details: http://xmpp.org/extensions/xep-0030.html
            * All features are shown here: http://xmpp.org/registrar/disco-features.html
            */
            model: converse.Feature,
            initialize: function () {
                this.localStorage = new Backbone.LocalStorage(
                    hex_sha1('converse.features'+converse.bare_jid));
                if (this.localStorage.records.length === 0) {
                    // localStorage is empty, so we've likely never queried this
                    // domain for features yet
                    converse.connection.disco.info(converse.domain, null, $.proxy(this.onInfo, this));
                    converse.connection.disco.items(converse.domain, null, $.proxy(this.onItems, this));
                } else {
                    this.fetch({add:true});
                }
            },

            onItems: function (stanza) {
                $(stanza).find('query item').each($.proxy(function (idx, item) {
                    converse.connection.disco.info(
                        $(item).attr('jid'),
                        null,
                        $.proxy(this.onInfo, this));
                }, this));
            },

            onInfo: function (stanza) {
                var $stanza = $(stanza);
                if (($stanza.find('identity[category=server][type=im]').length === 0) &&
                    ($stanza.find('identity[category=conference][type=text]').length === 0)) {
                    // This isn't an IM server component
                    return;
                }
                $stanza.find('feature').each($.proxy(function (idx, feature) {
                    this.create({
                        'var': $(feature).attr('var'),
                        'from': $stanza.attr('from')
                    });
                }, this));
            }
        });

        this.LoginPanel = Backbone.View.extend({
            tagName: 'div',
            id: "login-dialog",
            events: {
                'submit form#converse-login': 'authenticate'
            },
            tab_template: _.template(
                '<li><a class="current" href="#login">'+__('Sign in')+'</a></li>'
            ),
            template: _.template(
                '<form id="converse-login">' +
                '<label>'+__('XMPP/Jabber Username:')+'</label>' +
                '<input type="username" name="jid">' +
                '<label>'+__('Password:')+'</label>' +
                '<input type="password" name="password">' +
                '<input class="login-submit" type="submit" value="'+__('Log In')+'">' +
                '</form">'
            ),
            bosh_url_input: _.template(
                '<label>'+__('BOSH Service URL:')+'</label>' +
                '<input type="text" id="bosh_service_url">'
            ),

            connect: function ($form, jid, password) {
                if ($form) {
                    $form.find('input[type=submit]').hide().after('<span class="spinner login-submit"/>');
                }
                converse.connection = new Strophe.Connection(converse.bosh_service_url);
                converse.connection.connect(jid, password, converse.onConnect);
            },

            showLoginButton: function () {
                var $form = this.$el.find('#converse-login');
                var $button = $form.find('input[type=submit]');
                if ($button.length) {
                    $button.show().siblings('span').remove();
                }
            },

            initialize: function (cfg) {
                cfg.$parent.html(this.$el.html(this.template()));
                this.$tabs = cfg.$parent.parent().find('#controlbox-tabs');
            },

            render: function () {
                this.$tabs.append(this.tab_template());
                this.$el.find('input#jid').focus();
                return this;
            },

            authenticate: function (ev) {
                var $form = $(ev.target),
                    $jid_input = $form.find('input[name=jid]'),
                    jid = $jid_input.val(),
                    $pw_input = $form.find('input[name=password]'),
                    password = $pw_input.val(),
                    $bsu_input = null,
                    errors = false;

                if (! converse.bosh_service_url) {
                    $bsu_input = $form.find('input#bosh_service_url');
                    converse.bosh_service_url = $bsu_input.val();
                    if (! converse.bosh_service_url)  {
                        errors = true;
                        $bsu_input.addClass('error');
                    }
                }
                if (! jid) {
                    errors = true;
                    $jid_input.addClass('error');
                }
                if (! password)  {
                    errors = true;
                    $pw_input.addClass('error');
                }
                if (errors) { return; }
                this.connect($form, jid, password);
                return false;
            },

            remove: function () {
                this.$tabs.empty();
                this.$el.parent().empty();
            }
        });

        this.ControlBoxToggle = Backbone.View.extend({
            tagName: 'a',
            className: 'toggle-online-users',
            id: 'toggle-controlbox',
            events: {
                'click': 'onClick'
            },
            attributes: {
                'href': "#"
            },

            template: _.template(
                '<strong class="conn-feedback">Toggle chat</strong>'+
                '<strong style="display: none" id="online-count">(0)</strong>'
            ),

            initialize: function () {
                this.render();
            },

            render: function () {
                $('#conversejs').append(this.$el.html(this.template()));
                return this;
            },

            showControlBox: function () {
                var controlbox = converse.chatboxes.get('controlbox');
                if (!controlbox) {
                    converse.chatboxes.add({
                        id: 'controlbox',
                        box_id: 'controlbox',
                        visible: true
                    });
                    if (converse.connection) {
                        converse.chatboxes.get('controlbox').save();
                    }
                } else {
                    controlbox.trigger('show');
                }
            },

            onClick: function (e) {
                e.preventDefault();
                if ($("div#controlbox").is(':visible')) {
                    var controlbox = converse.chatboxes.get('controlbox');
                    if (converse.connection) {
                        controlbox.destroy();
                    } else {
                        controlbox.trigger('hide');
                    }
                } else {
                    this.showControlBox();
                }
            }
        });

        // Initialization
        // --------------
        // This is the end of the initialize method.
        this.chatboxes = new this.ChatBoxes();
        this.chatboxesview = new this.ChatBoxesView({model: this.chatboxes});
        this.controlboxtoggle = new this.ControlBoxToggle();
        this.otr = new this.OTR();

        if ((this.prebind) && (!this.connection)) {
            if ((!this.jid) || (!this.sid) || (!this.rid) || (!this.bosh_service_url)) {
                this.log('If you set prebind=true, you MUST supply JID, RID and SID values');
                return;
            }
            this.connection = new Strophe.Connection(this.bosh_service_url);
            this.connection.attach(this.jid, this.sid, this.rid, this.onConnect);
        } else if (this.connection) {
            this.onConnected();
        }
        if (this.show_controlbox_by_default) { this.controlboxtoggle.showControlBox(); }
        converse.emit('onInitialized');
    };
    return {
        'initialize': function (settings, callback) {
            converse.initialize(settings, callback);
        },
        'getRID': function () {
            if (converse.expose_rid_and_sid && typeof converse.connection !== "undefined") {
                return converse.connection.rid;
            }
            return null;
        },
        'getSID': function () {
            if (converse.expose_rid_and_sid && typeof converse.connection !== "undefined") {
                return converse.connection.sid;
            }
            return null;
        },
        'once': function(evt, handler) {
            converse.once(evt, handler);
        },
        'on': function(evt, handler) {
            converse.on(evt, handler);
        },
        'off': function(evt, handler) {
            converse.off(evt, handler);
        }
    };
}));