All files privatebin.js

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        1x   400x 301x 301x     400x 400x 400x                   1x   200x       200x 200x 200x 200x   200x                     1x   201x 201x 201x 201x     201x 201x 201x 201x     1x                 1x 1x                 1x                               100x 100x 225x   100x               100x                     1x     100x         100x   100x     100x   100x 100x   100x 100x   100x 81x             100x               100x                 1x     200x   200x   200x 52x                         1x   100x     100x 100x 100x 100x 100x 100x 100x   100x                     1x   100x 100x                 1x                             1x   200x                 1x   326x 326x                   1x   200x     200x 200x                     1x   100x 100x                       1x   200x                               1x     100x     100x                                                                                                                 1x 200x 100x 100x 9x         91x 8x                 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/**
 * PrivateBin
 *
 * a zero-knowledge paste bin
 *
 * @see       {@link https://github.com/PrivateBin/PrivateBin}
 * @copyright 2012 Sébastien SAUVAGE ({@link http://sebsauvage.net})
 * @license   {@link https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License}
 * @version   1.7.0
 * @name      PrivateBin
 * @namespace
 */
 
// global Base64, DOMPurify, FileReader, RawDeflate, history, navigator, prettyPrint, prettyPrintOne, showdown, kjua
 
jQuery.fn.draghover = function() {
    'use strict';
    return this.each(function() {
        let collection = $(),
            self = $(this);
 
        self.on('dragenter', function(e) {
            if (collection.length === 0) {
                self.trigger('draghoverstart');
            }
            collection = collection.add(e.target);
        });
 
        self.on('dragleave drop', function(e) {
            collection = collection.not(e.target);
            if (collection.length === 0) {
                self.trigger('draghoverend');
            }
        });
    });
};
 
// main application start, called when DOM is fully loaded
jQuery(document).ready(function() {
    'use strict';
    // run main controller
    $.PrivateBin.Controller.init();
});
 
jQuery.PrivateBin = (function($, RawDeflate) {
    'use strict';
 
    /**
     * zlib library interface
     *
     * @private
     */
    let z;
 
    /**
     * DOMpurify settings for HTML content
     *
     * @private
     */
     const purifyHtmlConfig = {
        ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|magnet):)/i,
        SAFE_FOR_JQUERY: true,
        USE_PROFILES: {
            html: true
        }
    };
 
    /**
     * DOMpurify settings for SVG content
     *
     * @private
     */
     const purifySvgConfig = {
        USE_PROFILES: {
            svg: true,
            svgFilters: true
        }
    };
 
    /**
     * URL fragment prefix requiring load confirmation
     *
     * @private
     */
    const loadConfirmPrefix = '#-';
 
    /**
     * CryptoData class
     *
     * bundles helper functions used in both paste and comment formats
     *
     * @name CryptoData
     * @class
     */
    function CryptoData(data) {
        this.v = 1;
        // store all keys in the default locations for drop-in replacement
        for (let key in data) {
            this[key] = data[key];
        }
 
        /**
         * gets the cipher data (cipher text + adata)
         *
         * @name CryptoData.getCipherData
         * @function
         * @return {Array}|{string}
         */
        this.getCipherData = function()
        {
            return this.v === 1 ? this.data : [this.ct, this.adata];
        }
    }
 
    /**
     * Paste class
     *
     * bundles helper functions around the paste formats
     *
     * @name Paste
     * @class
     */
    function Paste(data) {
        // inherit constructor and methods of CryptoData
        CryptoData.call(this, data);
 
        /**
         * gets the used formatter
         *
         * @name Paste.getFormat
         * @function
         * @return {string}
         */
        this.getFormat = function()
        {
            return this.v === 1 ? this.meta.formatter : this.adata[1];
        }
 
        /**
         * gets the remaining seconds before the paste expires
         *
         * returns 0 if there is no expiration
         *
         * @name Paste.getTimeToLive
         * @function
         * @return {string}
         */
        this.getTimeToLive = function()
        {
            return (this.v === 1 ? this.meta.remaining_time : this.meta.time_to_live) || 0;
        }
 
        /**
         * is burn-after-reading enabled
         *
         * @name Paste.isBurnAfterReadingEnabled
         * @function
         * @return {bool}
         */
        this.isBurnAfterReadingEnabled = function()
        {
            return (this.v === 1 ? this.meta.burnafterreading : this.adata[3]);
        }
 
        /**
         * are discussions enabled
         *
         * @name Paste.isDiscussionEnabled
         * @function
         * @return {bool}
         */
        this.isDiscussionEnabled = function()
        {
            return (this.v === 1 ? this.meta.opendiscussion : this.adata[2]);
        }
    }
 
    /**
     * Comment class
     *
     * bundles helper functions around the comment formats
     *
     * @name Comment
     * @class
     */
    function Comment(data) {
        // inherit constructor and methods of CryptoData
        CryptoData.call(this, data);
 
        /**
         * gets the UNIX timestamp of the comment creation
         *
         * @name Comment.getCreated
         * @function
         * @return {int}
         */
        this.getCreated = function()
        {
            return this.meta[this.v === 1 ? 'postdate' : 'created'];
        }
 
        /**
         * gets the icon of the comment submitter
         *
         * @name Comment.getIcon
         * @function
         * @return {string}
         */
        this.getIcon = function()
        {
            return this.meta[this.v === 1 ? 'vizhash' : 'icon'] || '';
        }
    }
 
    /**
     * static Helper methods
     *
     * @name Helper
     * @class
     */
    const Helper = (function () {
        const me = {};
 
        /**
         * character to HTML entity lookup table
         *
         * @see    {@link https://github.com/janl/mustache.js/blob/master/mustache.js#L60}
         * @name Helper.entityMap
         * @private
         * @enum   {Object}
         * @readonly
         */
        const entityMap = {
            '&': '&',
            '<': '&lt;',
            '>': '&gt;',
            '"': '&quot;',
            '\'': '&#39;',
            '/': '&#x2F;',
            '`': '&#x60;',
            '=': '&#x3D;'
        };
 
        /**
         * number of seconds in a minute
         *
         * @name Helper.minute
         * @private
         * @enum   {number}
         * @readonly
         */
        const minute = 60;
 
        /**
         * number of seconds in an hour
         *
         * = 60 * 60 seconds
         *
         * @name Helper.minute
         * @private
         * @enum   {number}
         * @readonly
         */
        const hour = 3600;
 
        /**
         * number of seconds in a day
         *
         * = 60 * 60 * 24 seconds
         *
         * @name Helper.day
         * @private
         * @enum   {number}
         * @readonly
         */
        const day = 86400;
 
        /**
         * number of seconds in a week
         *
         * = 60 * 60 * 24 * 7 seconds
         *
         * @name Helper.week
         * @private
         * @enum   {number}
         * @readonly
         */
        const week = 604800;
 
        /**
         * number of seconds in a month (30 days, an approximation)
         *
         * = 60 * 60 * 24 * 30 seconds
         *
         * @name Helper.month
         * @private
         * @enum   {number}
         * @readonly
         */
        const month = 2592000;
 
        /**
         * number of seconds in a non-leap year
         *
         * = 60 * 60 * 24 * 365 seconds
         *
         * @name Helper.year
         * @private
         * @enum   {number}
         * @readonly
         */
        const year = 31536000;
 
        /**
         * cache for script location
         *
         * @name Helper.baseUri
         * @private
         * @enum   {string|null}
         */
        let baseUri = null;
 
        /**
         * converts a duration (in seconds) into human friendly approximation
         *
         * @name Helper.secondsToHuman
         * @function
         * @param  {number} seconds
         * @return {Array}
         */
        me.secondsToHuman = function(seconds)
        {
            let v;
            if (seconds < minute)
            {
                v = Math.floor(seconds);
                return [v, 'second'];
            }
            if (seconds < hour)
            {
                v = Math.floor(seconds / minute);
                return [v, 'minute'];
            }
            if (seconds < day)
            {
                v = Math.floor(seconds / hour);
                return [v, 'hour'];
            }
            // If less than 2 months, display in days:
            if (seconds < (2 * month))
            {
                v = Math.floor(seconds / day);
                return [v, 'day'];
            }
            v = Math.floor(seconds / month);
            return [v, 'month'];
        };
 
        /**
         * converts a duration string into seconds
         *
         * The string is expected to be optional digits, followed by a time.
         * Supported times are: min, hour, day, month, year, never
         * Examples: 5min, 13hour, never
         *
         * @name Helper.durationToSeconds
         * @function
         * @param  {String} duration
         * @return {number}
         */
        me.durationToSeconds = function(duration)
        {
            let pieces   = duration.split(/(\D+)/),
                factor   = pieces[0] || 0,
                timespan = pieces[1] || pieces[0];
            switch (timespan)
            {
                case 'min':
                    return factor * minute;
                case 'hour':
                    return factor * hour;
                case 'day':
                    return factor * day;
                case 'week':
                    return factor * week;
                case 'month':
                    return factor * month;
                case 'year':
                    return factor * year;
                case 'never':
                    return 0;
                default:
                    return factor;
            }
        };
 
        /**
         * text range selection
         *
         * @see    {@link https://stackoverflow.com/questions/985272/jquery-selecting-text-in-an-element-akin-to-highlighting-with-your-mouse}
         * @name   Helper.selectText
         * @function
         * @param  {HTMLElement} element
         */
        me.selectText = function(element)
        {
            let range, selection;
 
            // MS
            Iif (document.body.createTextRange) {
                range = document.body.createTextRange();
                range.moveToElementText(element);
                range.select();
            } else Iif (window.getSelection) {
                selection = window.getSelection();
                range = document.createRange();
                range.selectNodeContents(element);
                selection.removeAllRanges();
                selection.addRange(range);
            }
        };
 
        /**
         * convert URLs to clickable links in the provided element.
         *
         * URLs to handle:
         * <pre>
         *     magnet:?xt.1=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C&xt.2=urn:sha1:TXGCZQTH26NL6OUQAJJPFALHG2LTGBC7
         *     https://example.com:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
         *     http://user:example.com@localhost:8800/zero/?6f09182b8ea51997#WtLEUO5Epj9UHAV9JFs+6pUQZp13TuspAUjnF+iM+dM=
         * </pre>
         *
         * @name   Helper.urls2links
         * @function
         * @param  {HTMLElement} element
         */
        me.urls2links = function(element)
        {
            element.html(
                DOMPurify.sanitize(
                    element.html().replace(
                        /(((https?|ftp):\/\/[\w?!=&.\/-;#@~%+*-]+(?![\w\s?!&.\/;#~%"=-]>))|((magnet):[\w?=&.\/-;#@~%+*-]+))/ig,
                        '<a href="$1" rel="nofollow noopener noreferrer">$1</a>'
                    ),
                    purifyHtmlConfig
                )
            );
        };
 
        /**
         * minimal sprintf emulation for %s and %d formats
         *
         * Note that this function needs the parameters in the same order as the
         * format strings appear in the string, contrary to the original.
         *
         * @see    {@link https://stackoverflow.com/questions/610406/javascript-equivalent-to-printf-string-format#4795914}
         * @name   Helper.sprintf
         * @function
         * @param  {string} format
         * @param  {...*} args - one or multiple parameters injected into format string
         * @return {string}
         */
        me.sprintf = function()
        {
            const args = Array.prototype.slice.call(arguments);
            let format = args[0],
                i = 1;
            return format.replace(/%(s|d)/g, function (m) {
                let val = args[i];
                if (m === '%d') {
                    val = parseFloat(val);
                    if (isNaN(val)) {
                        val = 0;
                    }
                }
                ++i;
                return val;
            });
        };
 
        /**
         * get value of cookie, if it was set, empty string otherwise
         *
         * @see    {@link http://www.w3schools.com/js/js_cookies.asp}
         * @name   Helper.getCookie
         * @function
         * @param  {string} cname - may not be empty
         * @return {string}
         */
        me.getCookie = function(cname) {
            const name = cname + '=',
                  ca   = document.cookie.split(';');
            for (let i = 0; i < ca.length; ++i) {
                let c = ca[i];
                while (c.charAt(0) === ' ')
                {
                    c = c.substring(1);
                }
                if (c.indexOf(name) === 0)
                {
                    return c.substring(name.length, c.length);
                }
            }
            return '';
        };
 
        /**
         * get the current location (without search or hash part of the URL),
         * eg. https://example.com/path/?aaaa#bbbb --> https://example.com/path/
         *
         * @name   Helper.baseUri
         * @function
         * @return {string}
         */
        me.baseUri = function()
        {
            // check for cached version
            if (baseUri !== null) {
                return baseUri;
            }
 
            baseUri = window.location.origin + window.location.pathname;
            return baseUri;
        };
 
        /**
         * wrap an object into a Paste, used for mocking in the unit tests
         *
         * @name   Helper.PasteFactory
         * @function
         * @param  {object} data
         * @return {Paste}
         */
        me.PasteFactory = function(data)
        {
            return new Paste(data);
        };
 
        /**
         * wrap an object into a Comment, used for mocking in the unit tests
         *
         * @name   Helper.CommentFactory
         * @function
         * @param  {object} data
         * @return {Comment}
         */
        me.CommentFactory = function(data)
        {
            return new Comment(data);
        };
 
        /**
         * convert all applicable characters to HTML entities
         *
         * @see    {@link https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html}
         * @name   Helper.htmlEntities
         * @function
         * @param  {string} str
         * @return {string} escaped HTML
         */
        me.htmlEntities = function(str) {
            return String(str).replace(
                /[&<>"'`=\/]/g, function(s) {
                    return entityMap[s];
                }
            );
        }
 
        /**
         * calculate expiration date given initial date and expiration period
         *
         * @name   Helper.calculateExpirationDate
         * @function
         * @param  {Date} initialDate - may not be empty
         * @param  {string|number} expirationDisplayStringOrSecondsToExpire - may not be empty
         * @return {Date}
         */
        me.calculateExpirationDate = function(initialDate, expirationDisplayStringOrSecondsToExpire) {
            let expirationDate      = new Date(initialDate),
                secondsToExpiration = expirationDisplayStringOrSecondsToExpire;
            if (typeof expirationDisplayStringOrSecondsToExpire === 'string') {
                secondsToExpiration = me.durationToSeconds(expirationDisplayStringOrSecondsToExpire);
            }
 
            if (typeof secondsToExpiration !== 'number') {
                throw new Error('Cannot calculate expiration date.');
            }
            if (secondsToExpiration === 0) {
                return null;
            }
 
            expirationDate = expirationDate.setUTCSeconds(expirationDate.getUTCSeconds() + secondsToExpiration);
            return expirationDate;
        };
 
        /**
         * resets state, used for unit testing
         *
         * @name   Helper.reset
         * @function
         */
        me.reset = function()
        {
            baseUri = null;
        };
 
        return me;
    })();
 
    /**
     * internationalization module
     *
     * @name I18n
     * @class
     */
    const I18n = (function () {
        const me = {};
 
        /**
         * const for string of loaded language
         *
         * @name I18n.languageLoadedEvent
         * @private
         * @prop   {string}
         * @readonly
         */
        const languageLoadedEvent = 'languageLoaded';
 
        /**
         * supported languages, minus the built in 'en'
         *
         * @name I18n.supportedLanguages
         * @private
         * @prop   {string[]}
         * @readonly
         */
        const supportedLanguages = ['ar', 'bg', 'ca', 'co', 'cs', 'de', 'el', 'es', 'et', 'fi', 'fr', 'he', 'hu', 'id', 'it', 'ja', 'jbo', 'lt', 'no', 'nl', 'pl', 'pt', 'oc', 'ro', 'ru', 'sk', 'sl', 'th', 'tr', 'uk', 'zh'];
 
        /**
         * built in language
         *
         * @name I18n.language
         * @private
         * @prop   {string|null}
         */
        let language = null;
 
        /**
         * translation cache
         *
         * @name I18n.translations
         * @private
         * @enum   {Object}
         */
        let translations = {};
 
        /**
         * translate a string, alias for I18n.translate
         *
         * @name   I18n._
         * @function
         * @param  {jQuery} $element - optional
         * @param  {string} messageId
         * @param  {...*} args - one or multiple parameters injected into placeholders
         * @return {string}
         */
        me._ = function()
        {
            return me.translate.apply(this, arguments);
        };
 
        /**
         * translate a string
         *
         * Optionally pass a jQuery element as the first parameter, to automatically
         * let the text of this element be replaced. In case the (asynchronously
         * loaded) language is not downloaded yet, this will make sure the string
         * is replaced when it eventually gets loaded. Using this is both simpler
         * and more secure, as it avoids potential XSS when inserting text.
         * The next parameter is the message ID, matching the ones found in
         * the translation files under the i18n directory.
         * Any additional parameters will get inserted into the message ID in
         * place of %s (strings) or %d (digits), applying the appropriate plural
         * in case of digits. See also Helper.sprintf().
         *
         * @name   I18n.translate
         * @function
         * @param  {jQuery} $element - optional
         * @param  {string} messageId
         * @param  {...*} args - one or multiple parameters injected into placeholders
         * @return {string}
         */
        me.translate = function()
        {
            // convert parameters to array
            let args = Array.prototype.slice.call(arguments),
                messageId,
                $element = null;
 
            // parse arguments
            if (args[0] instanceof jQuery) {
                // optional jQuery element as first parameter
                $element = args[0];
                args.shift();
            }
 
            // extract messageId from arguments
            let usesPlurals = $.isArray(args[0]);
            if (usesPlurals) {
                // use the first plural form as messageId, otherwise the singular
                messageId = args[0].length > 1 ? args[0][1] : args[0][0];
            } else {
                messageId = args[0];
            }
 
            if (messageId.length === 0) {
                return messageId;
            }
 
            // if no translation string cannot be found (in translations object)
            if (!translations.hasOwnProperty(messageId) || language === null) {
                // if language is still loading and we have an elemt assigned
                if (language === null && $element !== null) {
                    // handle the error by attaching the language loaded event
                    let orgArguments = arguments;
                    $(document).on(languageLoadedEvent, function () {
                        // re-execute this function
                        me.translate.apply(this, orgArguments);
                    });
 
                    // and fall back to English for now until the real language
                    // file is loaded
                }
 
                // for all other languages than English for which this behaviour
                // is expected as it is built-in, log error
                Iif (language !== null && language !== 'en') {
                    console.error('Missing translation for: \'' + messageId + '\' in language ' + language);
                    // fallback to English
                }
 
                // save English translation (should be the same on both sides)
                translations[messageId] = args[0];
            }
 
            // lookup plural translation
            if (usesPlurals && $.isArray(translations[messageId])) {
                let n = parseInt(args[1] || 1, 10),
                    key = me.getPluralForm(n),
                    maxKey = translations[messageId].length - 1;
                Iif (key > maxKey) {
                    key = maxKey;
                }
                args[0] = translations[messageId][key];
                args[1] = n;
            } else {
                // lookup singular translation
                args[0] = translations[messageId];
            }
 
            // messageID may contain links, but should be from a trusted source (code or translation JSON files)
            let containsLinks = args[0].indexOf('<a') !== -1;
 
            // prevent double encoding, when we insert into a text node
            if (containsLinks || $element === null) {
                for (let i = 0; i < args.length; ++i) {
                    // parameters (i > 0) may never contain HTML as they may come from untrusted parties
                    if ((containsLinks ? i > 1 : i > 0) || !containsLinks) {
                        args[i] = Helper.htmlEntities(args[i]);
                    }
                }
            }
            // format string
            let output = Helper.sprintf.apply(this, args);
 
            if (containsLinks) {
                // only allow tags/attributes we actually use in translations
                output = DOMPurify.sanitize(
                    output, {
                        ALLOWED_TAGS: ['a', 'i', 'span'],
                        ALLOWED_ATTR: ['href', 'id']
                    }
                );
            }
 
            // if $element is given, insert translation
            if ($element !== null) {
                if (containsLinks) {
                    $element.html(output);
                } else {
                    // text node takes care of entity encoding
                    $element.text(output);
                }
                return '';
            }
 
            return output;
        };
 
        /**
         * get currently loaded language
         *
         * @name   I18n.getLanguage
         * @function
         * @return {string}
         */
        me.getLanguage = function()
        {
            return language;
        };
 
        /**
         * per language functions to use to determine the plural form
         *
         * @see    {@link https://docs.translatehouse.org/projects/localization-guide/en/latest/l10n/pluralforms.html}
         * @name   I18n.getPluralForm
         * @function
         * @param  {int} n
         * @return {int} array key
         */
        me.getPluralForm = function(n) {
            switch (language)
            {
                case 'ar':
                    return n === 0 ? 0 : (n === 1 ? 1 : (n === 2 ? 2 : (n % 100 >= 3 && n % 100 <= 10 ? 3 : (n % 100 >= 11 ? 4 : 5))));
                case 'cs':
                case 'sk':
                    return n === 1 ? 0 : (n >= 2 && n <= 4 ? 1 : 2);
                case 'co':
                case 'fr':
                case 'oc':
                case 'tr':
                case 'zh':
                    return n > 1 ? 1 : 0;
                case 'he':
                    return n === 1 ? 0 : (n === 2 ? 1 : ((n < 0 || n > 10) && (n % 10 === 0) ? 2 : 3));
                case 'id':
                case 'ja':
                case 'jbo':
                case 'th':
                    return 0;
                case 'lt':
                    return n % 10 === 1 && n % 100 !== 11 ? 0 : ((n % 10 >= 2 && n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
                case 'pl':
                    return n === 1 ? 0 : (n % 10 >= 2 && n %10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
                case 'ro':
                    return n === 1 ? 0 : ((n === 0 || (n % 100 > 0 && n % 100 < 20)) ? 1 : 2);
                case 'ru':
                case 'uk':
                    return n % 10 === 1 && n % 100 !== 11 ? 0 : (n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
                case 'sl':
                    return n % 100 === 1 ? 1 : (n % 100 === 2 ? 2 : (n % 100 === 3 || n % 100 === 4 ? 3 : 0));
                // bg, ca, de, el, en, es, et, fi, hu, it, nl, no, pt
                default:
                    return n !== 1 ? 1 : 0;
            }
        };
 
        /**
         * load translations into cache
         *
         * @name   I18n.loadTranslations
         * @function
         */
        me.loadTranslations = function()
        {
            let newLanguage = Helper.getCookie('lang');
 
            // auto-select language based on browser settings
            if (newLanguage.length === 0) {
                newLanguage = (navigator.language || navigator.userLanguage || 'en');
                if (newLanguage.indexOf('-') > 0) {
                    newLanguage = newLanguage.split('-')[0];
                }
            }
 
            // if language is already used skip update
            if (newLanguage === language) {
                return;
            }
 
            // if language is built-in (English) skip update
            Eif (newLanguage === 'en') {
                language = 'en';
                return;
            }
 
            // if language is not supported, show error
            if (supportedLanguages.indexOf(newLanguage) === -1) {
                console.error('Language \'%s\' is not supported. Translation failed, fallback to English.', newLanguage);
                language = 'en';
                return;
            }
 
            // load strings from JSON
            $.getJSON('i18n/' + newLanguage + '.json', function(data) {
                language = newLanguage;
                translations = data;
                $(document).triggerHandler(languageLoadedEvent);
            }).fail(function (data, textStatus, errorMsg) {
                console.error('Language \'%s\' could not be loaded (%s: %s). Translation failed, fallback to English.', newLanguage, textStatus, errorMsg);
                language = 'en';
            });
        };
 
        /**
         * resets state, used for unit testing
         *
         * @name   I18n.reset
         * @function
         */
        me.reset = function(mockLanguage, mockTranslations)
        {
            language = mockLanguage || null;
            translations = mockTranslations || {};
        };
 
        return me;
    })();
 
    /**
     * handles everything related to en/decryption
     *
     * @name CryptTool
     * @class
     */
    const CryptTool = (function () {
        const me = {};
 
        /**
         * base58 encoder & decoder
         *
         * @private
         */
        let base58 = new baseX('123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz');
 
        /**
         * convert UTF-8 string stored in a DOMString to a standard UTF-16 DOMString
         *
         * Iterates over the bytes of the message, converting them all hexadecimal
         * percent encoded representations, then URI decodes them all
         *
         * @name   CryptTool.utf8To16
         * @function
         * @private
         * @param  {string} message UTF-8 string
         * @return {string} UTF-16 string
         */
        function utf8To16(message)
        {
            return decodeURIComponent(
                message.split('').map(
                    function(character)
                    {
                        return '%' + ('00' + character.charCodeAt(0).toString(16)).slice(-2);
                    }
                ).join('')
            );
        }
 
        /**
         * convert DOMString (UTF-16) to a UTF-8 string stored in a DOMString
         *
         * URI encodes the message, then finds the percent encoded characters
         * and transforms these hexadecimal representation back into bytes
         *
         * @name   CryptTool.utf16To8
         * @function
         * @private
         * @param  {string} message UTF-16 string
         * @return {string} UTF-8 string
         */
        function utf16To8(message)
        {
            return encodeURIComponent(message).replace(
                /%([0-9A-F]{2})/g,
                function (match, hexCharacter)
                {
                    return String.fromCharCode('0x' + hexCharacter);
                }
            );
        }
 
        /**
         * convert ArrayBuffer into a UTF-8 string
         *
         * Iterates over the bytes of the array, catenating them into a string
         *
         * @name   CryptTool.arraybufferToString
         * @function
         * @private
         * @param  {ArrayBuffer} messageArray
         * @return {string} message
         */
        function arraybufferToString(messageArray)
        {
            const array = new Uint8Array(messageArray);
            let message = '',
                i       = 0;
            while(i < array.length) {
                message += String.fromCharCode(array[i++]);
            }
            return message;
        }
 
        /**
         * convert UTF-8 string into a Uint8Array
         *
         * Iterates over the bytes of the message, writing them to the array
         *
         * @name   CryptTool.stringToArraybuffer
         * @function
         * @private
         * @param  {string} message UTF-8 string
         * @return {Uint8Array} array
         */
        function stringToArraybuffer(message)
        {
            const messageArray = new Uint8Array(message.length);
            for (let i = 0; i < message.length; ++i) {
                messageArray[i] = message.charCodeAt(i);
            }
            return messageArray;
        }
 
        /**
         * compress a string (deflate compression), returns buffer
         *
         * @name   CryptTool.compress
         * @async
         * @function
         * @private
         * @param  {string} message
         * @param  {string} mode
         * @param  {object} zlib
         * @throws {string}
         * @return {ArrayBuffer} data
         */
        async function compress(message, mode, zlib)
        {
            message = stringToArraybuffer(
                utf16To8(message)
            );
            Iif (mode === 'zlib') {
                if (typeof zlib === 'undefined') {
                    throw 'Error compressing paste, due to missing WebAssembly support.'
                }
                return zlib.deflate(message).buffer;
            }
            return message;
        }
 
        /**
         * decompress potentially base64 encoded, deflate compressed buffer, returns string
         *
         * @name   CryptTool.decompress
         * @async
         * @function
         * @private
         * @param  {ArrayBuffer} data
         * @param  {string} mode
         * @param  {object} zlib
         * @throws {string}
         * @return {string} message
         */
        async function decompress(data, mode, zlib)
        {
            if (mode === 'zlib' || mode === 'none') {
                Iif (mode === 'zlib') {
                    if (typeof zlib === 'undefined') {
                        throw 'Error decompressing paste, due to missing WebAssembly support.'
                    }
                    data = zlib.inflate(
                        new Uint8Array(data)
                    ).buffer;
                }
                return utf8To16(
                    arraybufferToString(data)
                );
            }
            // detect presence of Base64.js, indicating legacy ZeroBin paste
            if (typeof Base64 === 'undefined') {
                return utf8To16(
                    RawDeflate.inflate(
                        utf8To16(
                            atob(
                                arraybufferToString(data)
                            )
                        )
                    )
                );
            } else {
                return Base64.btou(
                    RawDeflate.inflate(
                        Base64.fromBase64(
                            arraybufferToString(data)
                        )
                    )
                );
            }
        }
 
        /**
         * returns specified number of random bytes
         *
         * @name   CryptTool.getRandomBytes
         * @function
         * @private
         * @param  {int} length number of random bytes to fetch
         * @throws {string}
         * @return {string} random bytes
         */
        function getRandomBytes(length)
        {
            let bytes       = '';
            const byteArray = new Uint8Array(length);
            window.crypto.getRandomValues(byteArray);
            for (let i = 0; i < length; ++i) {
                bytes += String.fromCharCode(byteArray[i]);
            }
            return bytes;
        }
 
        /**
         * derive cryptographic key from key string and password
         *
         * @name   CryptTool.deriveKey
         * @async
         * @function
         * @private
         * @param  {string} key
         * @param  {string} password
         * @param  {array}  spec cryptographic specification
         * @return {CryptoKey} derived key
         */
        async function deriveKey(key, password, spec)
        {
            let keyArray = stringToArraybuffer(key);
            if (password.length > 0) {
                // version 1 pastes did append the passwords SHA-256 hash in hex
                if (spec[7] === 'rawdeflate') {
                    let passwordBuffer = await window.crypto.subtle.digest(
                        {name: 'SHA-256'},
                        stringToArraybuffer(
                            utf16To8(password)
                        )
                    ).catch(Alert.showError);
                    password = Array.prototype.map.call(
                        new Uint8Array(passwordBuffer),
                        x => ('00' + x.toString(16)).slice(-2)
                    ).join('');
                }
                let passwordArray = stringToArraybuffer(password),
                    newKeyArray = new Uint8Array(keyArray.length + passwordArray.length);
                newKeyArray.set(keyArray, 0);
                newKeyArray.set(passwordArray, keyArray.length);
                keyArray = newKeyArray;
            }
 
            // import raw key
            const importedKey = await window.crypto.subtle.importKey(
                'raw', // only 'raw' is allowed
                keyArray,
                {name: 'PBKDF2'}, // we use PBKDF2 for key derivation
                false, // the key may not be exported
                ['deriveKey'] // we may only use it for key derivation
            ).catch(Alert.showError);
 
            // derive a stronger key for use with AES
            return window.crypto.subtle.deriveKey(
                {
                    name: 'PBKDF2', // we use PBKDF2 for key derivation
                    salt: stringToArraybuffer(spec[1]), // salt used in HMAC
                    iterations: spec[2], // amount of iterations to apply
                    hash: {name: 'SHA-256'} // can be "SHA-1", "SHA-256", "SHA-384" or "SHA-512"
                },
                importedKey,
                {
                    name: 'AES-' + spec[6].toUpperCase(), // can be any supported AES algorithm ("AES-CTR", "AES-CBC", "AES-CMAC", "AES-GCM", "AES-CFB", "AES-KW", "ECDH", "DH" or "HMAC")
                    length: spec[3] // can be 128, 192 or 256
                },
                false, // the key may not be exported
                ['encrypt', 'decrypt'] // we may only use it for en- and decryption
            ).catch(Alert.showError);
        }
 
        /**
         * gets crypto settings from specification and authenticated data
         *
         * @name   CryptTool.cryptoSettings
         * @function
         * @private
         * @param  {string} adata authenticated data
         * @param  {array}  spec cryptographic specification
         * @return {object} crypto settings
         */
        function cryptoSettings(adata, spec)
        {
            return {
                name: 'AES-' + spec[6].toUpperCase(), // can be any supported AES algorithm ("AES-CTR", "AES-CBC", "AES-CMAC", "AES-GCM", "AES-CFB", "AES-KW", "ECDH", "DH" or "HMAC")
                iv: stringToArraybuffer(spec[0]), // the initialization vector you used to encrypt
                additionalData: stringToArraybuffer(adata), // the addtional data you used during encryption (if any)
                tagLength: spec[4] // the length of the tag you used to encrypt (if any)
            };
        }
 
        /**
         * compress, then encrypt message with given key and password
         *
         * @name   CryptTool.cipher
         * @async
         * @function
         * @param  {string} key
         * @param  {string} password
         * @param  {string} message
         * @param  {array}  adata
         * @return {array}  encrypted message in base64 encoding & adata containing encryption spec
         */
        me.cipher = async function(key, password, message, adata)
        {
            let zlib = (await z);
            // AES in Galois Counter Mode, keysize 256 bit,
            // authentication tag 128 bit, 10000 iterations in key derivation
            const compression = (
                    typeof zlib === 'undefined' ?
                    'none' : // client lacks support for WASM
                    ($('body').data('compression') || 'zlib')
                ),
                spec = [
                    getRandomBytes(16), // initialization vector
                    getRandomBytes(8),  // salt
                    100000,             // iterations
                    256,                // key size
                    128,                // tag size
                    'aes',              // algorithm
                    'gcm',              // algorithm mode
                    compression         // compression
                ], encodedSpec = [];
            for (let i = 0; i < spec.length; ++i) {
                encodedSpec[i] = i < 2 ? btoa(spec[i]) : spec[i];
            }
            if (adata.length === 0) {
                // comment
                adata = encodedSpec;
            } else Eif (adata[0] === null) {
                // paste
                adata[0] = encodedSpec;
            }
 
            // finally, encrypt message
            return [
                btoa(
                    arraybufferToString(
                        await window.crypto.subtle.encrypt(
                            cryptoSettings(JSON.stringify(adata), spec),
                            await deriveKey(key, password, spec),
                            await compress(message, compression, zlib)
                        ).catch(Alert.showError)
                    )
                ),
                adata
            ];
        };
 
        /**
         * decrypt message with key, then decompress
         *
         * @name   CryptTool.decipher
         * @async
         * @function
         * @param  {string} key
         * @param  {string} password
         * @param  {string|object} data encrypted message
         * @return {string} decrypted message, empty if decryption failed
         */
        me.decipher = async function(key, password, data)
        {
            let adataString, spec, cipherMessage, plaintext;
            let zlib = (await z);
            if (data instanceof Array) {
                // version 2
                adataString = JSON.stringify(data[1]);
                // clone the array instead of passing the reference
                spec = (data[1][0] instanceof Array ? data[1][0] : data[1]).slice();
                cipherMessage = data[0];
            } else Eif (typeof data === 'string') {
                // version 1
                let object = JSON.parse(data);
                adataString = atob(object.adata);
                spec = [
                    object.iv,
                    object.salt,
                    object.iter,
                    object.ks,
                    object.ts,
                    object.cipher,
                    object.mode,
                    'rawdeflate'
                ];
                cipherMessage = object.ct;
            } else {
                throw 'unsupported message format';
            }
            spec[0] = atob(spec[0]);
            spec[1] = atob(spec[1]);
            Iif (spec[7] === 'zlib') {
                if (typeof zlib === 'undefined') {
                    throw 'Error decompressing paste, due to missing WebAssembly support.'
                }
            }
            try {
                plaintext = await window.crypto.subtle.decrypt(
                    cryptoSettings(adataString, spec),
                    await deriveKey(key, password, spec),
                    stringToArraybuffer(
                        atob(cipherMessage)
                    )
                );
            } catch(err) {
                console.error(err);
                return '';
            }
            try {
                return await decompress(plaintext, spec[7], zlib);
            } catch(err) {
                Alert.showError(err);
                return err;
            }
        };
 
        /**
         * returns a random symmetric key
         *
         * generates 256 bit long keys (8 Bits * 32) for AES with 256 bit long blocks
         *
         * @name   CryptTool.getSymmetricKey
         * @function
         * @throws {string}
         * @return {string} raw bytes
         */
        me.getSymmetricKey = function()
        {
            return getRandomBytes(32);
        };
 
        /**
         * base58 encode a DOMString (UTF-16)
         *
         * @name   CryptTool.base58encode
         * @function
         * @param  {string} input
         * @return {string} output
         */
        me.base58encode = function(input)
        {
            return base58.encode(
                stringToArraybuffer(input)
            );
        }
 
        /**
         * base58 decode a DOMString (UTF-16)
         *
         * @name   CryptTool.base58decode
         * @function
         * @param  {string} input
         * @return {string} output
         */
        me.base58decode = function(input)
        {
            return arraybufferToString(
                base58.decode(input)
            );
        }
 
        return me;
    })();
 
    /**
     * (Model) Data source (aka MVC)
     *
     * @name   Model
     * @class
     */
    const Model = (function () {
        const me = {};
 
        let id = null,
            pasteData = null,
            symmetricKey = null,
            $templates;
 
        /**
         * returns the expiration set in the HTML
         *
         * @name   Model.getExpirationDefault
         * @function
         * @return string
         */
        me.getExpirationDefault = function()
        {
            return $('#pasteExpiration').val();
        };
 
        /**
         * returns the format set in the HTML
         *
         * @name   Model.getFormatDefault
         * @function
         * @return string
         */
        me.getFormatDefault = function()
        {
            return $('#pasteFormatter').val();
        };
 
        /**
         * returns the paste data (including the cipher data)
         *
         * @name   Model.getPasteData
         * @function
         * @param {function} callback (optional) Called when data is available
         * @param {function} useCache (optional) Whether to use the cache or
         *                            force a data reload. Default: true
         * @return string
         */
        me.getPasteData = function(callback, useCache)
        {
            // use cache if possible/allowed
            if (useCache !== false && pasteData !== null) {
                //execute callback
                if (typeof callback === 'function') {
                    return callback(pasteData);
                }
 
                // alternatively just using inline
                return pasteData;
            }
 
            // reload data
            ServerInteraction.prepare();
            ServerInteraction.setUrl(Helper.baseUri() + '?pasteid=' + me.getPasteId());
 
            ServerInteraction.setFailure(function (status, data) {
                // revert loading status…
                Alert.hideLoading();
                TopNav.showViewButtons();
 
                // show error message
                Alert.showError(ServerInteraction.parseUploadError(status, data, 'get paste data'));
            });
            ServerInteraction.setSuccess(function (status, data) {
                pasteData = new Paste(data);
 
                if (typeof callback === 'function') {
                    return callback(pasteData);
                }
            });
            ServerInteraction.run();
        };
 
        /**
         * get the pastes unique identifier from the URL,
         * eg. https://example.com/path/?c05354954c49a487#dfdsdgdgdfgdf returns c05354954c49a487
         *
         * @name   Model.getPasteId
         * @function
         * @return {string} unique identifier
         * @throws {string}
         */
        me.getPasteId = function()
        {
            const idRegEx = /^[a-z0-9]{16}$/;
 
            // return cached value
            Iif (id !== null) {
                return id;
            }
 
            // do use URL interface, if possible
            const url = new URL(window.location);
 
            for (const param of url.searchParams) {
                const key = param[0];
                const value = param[1];
 
                if (value === '' && idRegEx.test(key)) {
                    // safe, as the whole regex is matched
                    id = key;
                    return key;
                }
            }
 
            Eif (id === null) {
                throw 'no paste id given';
            }
 
            return id;
        }
 
        /**
         * returns true, when the URL has a delete token and the current call was used for deleting a paste.
         *
         * @name   Model.hasDeleteToken
         * @function
         * @return {bool}
         */
        me.hasDeleteToken = function()
        {
            return window.location.search.indexOf('deletetoken') !== -1;
        }
 
        /**
         * return the deciphering key stored in anchor part of the URL
         *
         * @name   Model.getPasteKey
         * @function
         * @return {string|null} key
         * @throws {string}
         */
        me.getPasteKey = function()
        {
            Eif (symmetricKey === null) {
                let startPos = 1;
                Iif(window.location.hash.startsWith(loadConfirmPrefix)) {
                    startPos = loadConfirmPrefix.length;
                }
                let newKey = window.location.hash.substring(startPos);
 
                // Some web 2.0 services and redirectors add data AFTER the anchor
                // (such as &utm_source=...). We will strip any additional data.
                let ampersandPos = newKey.indexOf('&');
                if (ampersandPos > -1)
                {
                    newKey = newKey.substring(0, ampersandPos);
                }
                if (newKey === '') {
                    throw 'no encryption key given';
                }
 
                // version 2 uses base58, version 1 uses base64 without decoding
                try {
                    // base58 encode strips NULL bytes at the beginning of the
                    // string, so we re-add them if necessary
                    symmetricKey = CryptTool.base58decode(newKey).padStart(32, '\u0000');
                } catch(e) {
                    symmetricKey = newKey;
                }
            }
 
            return symmetricKey;
        };
 
        /**
         * returns a jQuery copy of the HTML template
         *
         * @name Model.getTemplate
         * @function
         * @param  {string} name - the name of the template
         * @return {jQuery}
         */
        me.getTemplate = function(name)
        {
            // find template
            let $element = $templates.find('#' + name + 'template').clone(true);
            // change ID to avoid collisions (one ID should really be unique)
            return $element.prop('id', name);
        };
 
        /**
         * resets state, used for unit testing
         *
         * @name   Model.reset
         * @function
         */
        me.reset = function()
        {
            pasteData = $templates = id = symmetricKey = null;
        };
 
        /**
         * init navigation manager
         *
         * preloads jQuery elements
         *
         * @name   Model.init
         * @function
         */
        me.init = function()
        {
            $templates = $('#templates');
        };
 
        return me;
    })();
 
    /**
     * Helper functions for user interface
     *
     * everything directly UI-related, which fits nowhere else
     *
     * @name   UiHelper
     * @class
     */
    const UiHelper = (function () {
        const me = {};
 
        /**
         * handle history (pop) state changes
         *
         * currently this does only handle redirects to the home page.
         *
         * @name   UiHelper.historyChange
         * @private
         * @function
         * @param  {Event} event
         */
        function historyChange(event)
        {
            let currentLocation = Helper.baseUri();
            if (event.originalEvent.state === null && // no state object passed
                event.target.location.href === currentLocation && // target location is home page
                window.location.href === currentLocation // and we are not already on the home page
            ) {
                // redirect to home page
                window.location.href = currentLocation;
            }
        }
 
        /**
         * reload the page
         *
         * This takes the user to the PrivateBin homepage.
         *
         * @name   UiHelper.reloadHome
         * @function
         */
        me.reloadHome = function()
        {
            window.location.href = Helper.baseUri();
        };
 
        /**
         * checks whether the element is currently visible in the viewport (so
         * the user can actually see it)
         *
         * @see    {@link https://stackoverflow.com/a/40658647}
         * @name   UiHelper.isVisible
         * @function
         * @param  {jQuery} $element The link hash to move to.
         */
        me.isVisible = function($element)
        {
            let elementTop     = $element.offset().top,
                viewportTop    = $(window).scrollTop(),
                viewportBottom = viewportTop + $(window).height();
            return elementTop > viewportTop && elementTop < viewportBottom;
        };
 
        /**
         * scrolls to a specific element
         *
         * @see    {@link https://stackoverflow.com/questions/4198041/jquery-smooth-scroll-to-an-anchor#answer-12714767}
         * @name   UiHelper.scrollTo
         * @function
         * @param  {jQuery}           $element        The link hash to move to.
         * @param  {(number|string)}  animationDuration passed to jQuery .animate, when set to 0 the animation is skipped
         * @param  {string}           animationEffect   passed to jQuery .animate
         * @param  {function}         finishedCallback  function to call after animation finished
         */
        me.scrollTo = function($element, animationDuration, animationEffect, finishedCallback)
        {
            let $body = $('html, body'),
                margin = 50,
                callbackCalled = false,
                dest = 0;
 
            // calculate destination place
            // if it would scroll out of the screen at the bottom only scroll it as
            // far as the screen can go
            Iif ($element.offset().top > $(document).height() - $(window).height()) {
                dest = $(document).height() - $(window).height();
            } else {
                dest = $element.offset().top - margin;
            }
            // skip animation if duration is set to 0
            Iif (animationDuration === 0) {
                window.scrollTo(0, dest);
            } else {
                // stop previous animation
                $body.stop();
                // scroll to destination
                $body.animate({
                    scrollTop: dest
                }, animationDuration, animationEffect);
            }
 
            // as we have finished we can enable scrolling again
            $body.queue(function (next) {
                if (!callbackCalled) {
                    // call user function if needed
                    Eif (typeof finishedCallback !== 'undefined') {
                        finishedCallback();
                    }
 
                    // prevent calling this function twice
                    callbackCalled = true;
                }
                next();
            });
        };
 
        /**
         * trigger a history (pop) state change
         *
         * used to test the UiHelper.historyChange private function
         *
         * @name   UiHelper.mockHistoryChange
         * @function
         * @param  {string} state   (optional) state to mock
         */
        me.mockHistoryChange = function(state)
        {
            if (typeof state === 'undefined') {
                state = null;
            }
            historyChange($.Event('popstate', {originalEvent: new PopStateEvent('popstate', {state: state}), target: window}));
        };
 
        /**
         * initialize
         *
         * @name   UiHelper.init
         * @function
         */
        me.init = function()
        {
            // update link to home page
            $('.reloadlink').prop('href', Helper.baseUri());
 
            $(window).on('popstate', historyChange);
        };
 
        return me;
    })();
 
    /**
     * Alert/error manager
     *
     * @name   Alert
     * @class
     */
    const Alert = (function () {
        const me = {};
 
        let $errorMessage,
            $loadingIndicator,
            $statusMessage,
            $remainingTime,
            currentIcon,
            customHandler;
 
        const alertType = [
            'loading', // not in bootstrap CSS, but using a plausible value here
            'info',    // status icon
            'warning', // warning icon
            'danger'   // error icon
        ];
 
        /**
         * forwards a request to the i18n module and shows the element
         *
         * @name   Alert.handleNotification
         * @private
         * @function
         * @param  {int} id - id of notification
         * @param  {jQuery} $element - jQuery object
         * @param  {string|array} args
         * @param  {string|null} icon - optional, icon
         */
        function handleNotification(id, $element, args, icon)
        {
            // basic parsing/conversion of parameters
            if (typeof icon === 'undefined') {
                icon = null;
            }
            Iif (typeof args === 'undefined') {
                args = null;
            } else if (typeof args === 'string') {
                // convert string to array if needed
                args = [args];
            } else Iif (args  instanceof Error) {
                // extract message into array if needed
                args = [args.message];
            }
 
            // pass to custom handler if defined
            if (typeof customHandler === 'function') {
                let handlerResult = customHandler(alertType[id], $element, args, icon);
                if (handlerResult === true) {
                    // if it returns true, skip own handler
                    return;
                }
                Eif (handlerResult instanceof jQuery) {
                    // continue processing with new element
                    $element = handlerResult;
                    icon = null; // icons not supported in this case
                }
            }
            let $translationTarget = $element;
 
            // handle icon, if template uses one
            const $glyphIcon = $element.find(':first');
            if ($glyphIcon.length) {
                // if there is an icon, we need to provide an inner element
                // to translate the message into, instead of the parent
                $translationTarget = $('<span>');
                $element.html(' ').prepend($glyphIcon).append($translationTarget);
 
                if (icon !== null && // icon was passed
                    icon !== currentIcon[id] // and it differs from current icon
                ) {
                    // remove (previous) icon
                    $glyphIcon.removeClass(currentIcon[id]);
 
                    // any other thing as a string (e.g. 'null') (only) removes the icon
                    Eif (typeof icon === 'string') {
                        // set new icon
                        currentIcon[id] = 'glyphicon-' + icon;
                        $glyphIcon.addClass(currentIcon[id]);
                    }
                }
            }
 
            // show text
            Eif (args !== null) {
                // add jQuery object to it as first parameter
                args.unshift($translationTarget);
                // pass it to I18n
                I18n._.apply(this, args);
            }
 
            // show notification
            $element.removeClass('hidden');
        }
 
        /**
         * display a status message
         *
         * This automatically passes the text to I18n for translation.
         *
         * @name   Alert.showStatus
         * @function
         * @param  {string|array} message     string, use an array for %s/%d options
         * @param  {string|null}  icon        optional, the icon to show,
         *                                    default: leave previous icon
         */
        me.showStatus = function(message, icon)
        {
            handleNotification(1, $statusMessage, message, icon);
        };
 
        /**
         * display a warning message
         *
         * This automatically passes the text to I18n for translation.
         *
         * @name   Alert.showWarning
         * @function
         * @param  {string|array} message     string, use an array for %s/%d options
         * @param  {string|null}  icon        optional, the icon to show, default:
         *                                    leave previous icon
         */
        me.showWarning = function(message, icon)
        {
            $errorMessage.find(':first')
                         .removeClass(currentIcon[3])
                         .addClass(currentIcon[2]);
            handleNotification(2, $errorMessage, message, icon);
        };
 
        /**
         * display an error message
         *
         * This automatically passes the text to I18n for translation.
         *
         * @name   Alert.showError
         * @function
         * @param  {string|array} message     string, use an array for %s/%d options
         * @param  {string|null}  icon        optional, the icon to show, default:
         *                                    leave previous icon
         */
        me.showError = function(message, icon)
        {
            handleNotification(3, $errorMessage, message, icon);
        };
 
        /**
         * display remaining message
         *
         * This automatically passes the text to I18n for translation.
         *
         * @name   Alert.showRemaining
         * @function
         * @param  {string|array} message     string, use an array for %s/%d options
         */
        me.showRemaining = function(message)
        {
            handleNotification(1, $remainingTime, message);
        };
 
        /**
         * shows a loading message, optionally with a percentage
         *
         * This automatically passes all texts to the i10s module.
         *
         * @name   Alert.showLoading
         * @function
         * @param  {string|array|null} message      optional, use an array for %s/%d options, default: 'Loading…'
         * @param  {string|null}       icon         optional, the icon to show, default: leave previous icon
         */
        me.showLoading = function(message, icon)
        {
            // default message text
            Iif (typeof message === 'undefined') {
                message = 'Loading…';
            }
 
            handleNotification(0, $loadingIndicator, message, icon);
 
            // show loading status (cursor)
            $('body').addClass('loading');
        };
 
        /**
         * hides the loading message
         *
         * @name   Alert.hideLoading
         * @function
         */
        me.hideLoading = function()
        {
            $loadingIndicator.addClass('hidden');
 
            // hide loading cursor
            $('body').removeClass('loading');
        };
 
        /**
         * hides any status/error messages
         *
         * This does not include the loading message.
         *
         * @name   Alert.hideMessages
         * @function
         */
        me.hideMessages = function()
        {
            $statusMessage.addClass('hidden');
            $errorMessage.addClass('hidden');
        };
 
        /**
         * set a custom handler, which gets all notifications.
         *
         * This handler gets the following arguments:
         * alertType (see array), $element, args, icon
         * If it returns true, the own processing will be stopped so the message
         * will not be displayed. Otherwise it will continue.
         * As an aditional feature it can return q jQuery element, which will
         * then be used to add the message there. Icons are not supported in
         * that case and will be ignored.
         * Pass 'null' to reset/delete the custom handler.
         * Note that there is no notification when a message is supposed to get
         * hidden.
         *
         * @name   Alert.setCustomHandler
         * @function
         * @param {function|null} newHandler
         */
        me.setCustomHandler = function(newHandler)
        {
            customHandler = newHandler;
        };
 
        /**
         * init status manager
         *
         * preloads jQuery elements
         *
         * @name   Alert.init
         * @function
         */
        me.init = function()
        {
            // hide "no javascript" error message
            $('#noscript').hide();
 
            // not a reset, but first set of the elements
            $errorMessage = $('#errormessage');
            $loadingIndicator = $('#loadingindicator');
            $statusMessage = $('#status');
            $remainingTime = $('#remainingtime');
 
            currentIcon = [
                'glyphicon-time', // loading icon
                'glyphicon-info-sign', // status icon
                'glyphicon-warning-sign', // warning icon
                'glyphicon-alert' // error icon
            ];
        };
 
        return me;
    })();
 
    /**
     * handles paste status/result
     *
     * @name   PasteStatus
     * @class
     */
    const PasteStatus = (function () {
        const me = {};
 
        let $pasteSuccess,
            $pasteUrl,
            $remainingTime,
            $shortenButton;
 
        /**
         * forward to URL shortener
         *
         * @name   PasteStatus.sendToShortener
         * @private
         * @function
         */
        function sendToShortener()
        {
            if ($shortenButton.hasClass('buttondisabled')) {
                return;
            }
            $.ajax({
                type: 'GET',
                url: `${$shortenButton.data('shortener')}${encodeURIComponent($pasteUrl.attr('href'))}`,
                headers: {'Accept': 'text/html, application/xhtml+xml, application/xml, application/json'},
                processData: false,
                timeout: 10000,
                xhrFields: {
                    withCredentials: false
                },
                success: PasteStatus.extractUrl
            })
            .fail(function(data, textStatus, errorThrown) {
                console.error(textStatus, errorThrown);
                // we don't know why it failed, could be CORS of the external
                // server not setup properly, in which case we follow old
                // behavior to open it in new tab
                window.open(
                    `${$shortenButton.data('shortener')}${encodeURIComponent($pasteUrl.attr('href'))}`,
                    '_blank',
                    'noopener, noreferrer'
                );
            });
        }
 
        /**
         * Forces opening the paste if the link does not do this automatically.
         *
         * This is necessary as browsers will not reload the page when it is
         * already loaded (which is fake as it is set via history.pushState()).
         *
         * @name   PasteStatus.pasteLinkClick
         * @function
         */
        function pasteLinkClick()
        {
            // check if location is (already) shown in URL bar
            if (window.location.href === $pasteUrl.attr('href')) {
                // if so we need to load link by reloading the current site
                window.location.reload(true);
            }
        }
 
        /**
         * creates a notification after a successfull paste upload
         *
         * @name   PasteStatus.createPasteNotification
         * @function
         * @param  {string} url
         * @param  {string} deleteUrl
         */
        me.createPasteNotification = function(url, deleteUrl)
        {
            I18n._(
                $('#pastelink'),
                'Your paste is <a id="pasteurl" href="%s">%s</a> <span id="copyhint">(Hit [Ctrl]+[c] to copy)</span>',
                url, url
            );
            // save newly created element
            $pasteUrl = $('#pasteurl');
            // and add click event
            $pasteUrl.click(pasteLinkClick);
 
            // delete link
            $('#deletelink').html('<a href="' + deleteUrl + '"></a>');
            I18n._($('#deletelink a').first(), 'Delete data');
 
            // enable shortener button
            $shortenButton.removeClass('buttondisabled');
 
            // show result
            $pasteSuccess.removeClass('hidden');
            // we pre-select the link so that the user only has to [Ctrl]+[c] the link
            Helper.selectText($pasteUrl[0]);
        };
 
        /**
         * extracts URLs from given string
         *
         * if at least one is found, it disables the shortener button and
         * replaces the paste URL
         *
         * @name   PasteStatus.extractUrl
         * @function
         * @param  {string} response
         */
        me.extractUrl = function(response)
        {
            Iif (typeof response === 'object') {
                response = JSON.stringify(response);
            }
            Eif (typeof response === 'string' && response.length > 0) {
                const shortUrlMatcher = /https?:\/\/[^\s"<]+/g; // JSON API will have URL in quotes, XML in tags
                const shortUrl = (response.match(shortUrlMatcher) || []).filter(function(urlRegExMatch) {
                    Iif (typeof URL.canParse === 'function') {
                        return URL.canParse(urlRegExMatch);
                    }
                    // polyfill for older browsers (< 120) & node (< 19.9 & < 18.17)
                    try {
                        return !!new URL(urlRegExMatch);
                    } catch (error) {
                        return false;
                    }
                }).sort(function(a, b) {
                    return a.length - b.length; // shortest first
                })[0];
                Eif (typeof shortUrl === 'string' && shortUrl.length > 0) {
                    // we disable the button to avoid calling shortener again
                    $shortenButton.addClass('buttondisabled');
                    // update link
                    $pasteUrl.text(shortUrl);
                    $pasteUrl.prop('href', shortUrl);
                    // we pre-select the link so that the user only has to [Ctrl]+[c] the link
                    Helper.selectText($pasteUrl[0]);
                    return;
                }
            }
            Alert.showError('Cannot parse response from URL shortener.');
        };
 
        /**
         * shows the remaining time
         *
         * @name PasteStatus.showRemainingTime
         * @function
         * @param {Paste} paste
         */
        me.showRemainingTime = function(paste)
        {
            if (paste.isBurnAfterReadingEnabled()) {
                // display paste "for your eyes only" if it is deleted
 
                // the paste has been deleted when the JSON with the ciphertext
                // has been downloaded
 
                Alert.showRemaining('FOR YOUR EYES ONLY. Don\'t close this window, this message can\'t be displayed again.');
                $remainingTime.addClass('foryoureyesonly');
            } else if (paste.getTimeToLive() > 0) {
                // display paste expiration
                let expiration = Helper.secondsToHuman(paste.getTimeToLive()),
                    expirationLabel = [
                        'This document will expire in %d ' + expiration[1] + '.',
                        'This document will expire in %d ' + expiration[1] + 's.'
                    ];
 
                Alert.showRemaining([expirationLabel, expiration[0]]);
                $remainingTime.removeClass('foryoureyesonly');
            } else {
                // never expires
                return;
            }
 
            // in the end, display notification
            $remainingTime.removeClass('hidden');
        };
 
        /**
         * hides the remaining time and successful upload notification
         *
         * @name PasteStatus.hideMessages
         * @function
         */
        me.hideMessages = function()
        {
            $remainingTime.addClass('hidden');
            $pasteSuccess.addClass('hidden');
        };
 
        /**
         * init status manager
         *
         * preloads jQuery elements
         *
         * @name   PasteStatus.init
         * @function
         */
        me.init = function()
        {
            $pasteSuccess = $('#pastesuccess');
            // $pasteUrl is saved in me.createPasteNotification() after creation
            $remainingTime = $('#remainingtime');
            $shortenButton = $('#shortenbutton');
 
            // bind elements
            $shortenButton.click(sendToShortener);
        };
 
        return me;
    })();
 
    /**
     * password prompt
     *
     * @name Prompt
     * @class
     */
    const Prompt = (function () {
        const me = {};
 
        let $passwordDecrypt,
            $passwordForm,
            $passwordModal,
            password = '';
 
        /**
         * submit a password in the modal dialog
         *
         * @name Prompt.submitPasswordModal
         * @private
         * @function
         * @param  {Event} event
         */
        function submitPasswordModal(event)
        {
            event.preventDefault();
 
            // get input
            password = $passwordDecrypt.val();
 
            // hide modal
            $passwordModal.modal('hide');
 
            PasteDecrypter.run();
        }
 
        /**
         * Request users confirmation to load possibly burn after reading paste
         *
         * @name   Prompt.requestLoadConfirmation
         * @function
         */
        me.requestLoadConfirmation = function()
        {
            const $loadconfirmmodal = $('#loadconfirmmodal');
            if ($loadconfirmmodal.length > 0) {
                const $loadconfirmOpenNow = $loadconfirmmodal.find('#loadconfirm-open-now');
                $loadconfirmOpenNow.off('click.loadPaste');
                $loadconfirmOpenNow.on('click.loadPaste', PasteDecrypter.run);
                const $loadconfirmClose = $loadconfirmmodal.find('.close');
                $loadconfirmClose.off('click.close');
                $loadconfirmClose.on('click.close', Controller.newPaste);
                $loadconfirmmodal.modal('show');
            } else {
                if (window.confirm(
                    I18n._('Burn after reading pastes can only be displayed once upon loading it. Do you want to open it now?')
                )) {
                    PasteDecrypter.run();
                } else {
                    Controller.newPaste();
                }
            }
        }
 
        /**
         * ask the user for the password and set it
         *
         * @name Prompt.requestPassword
         * @function
         */
        me.requestPassword = function()
        {
            // show new bootstrap method (if available)
            Eif ($passwordModal.length !== 0) {
                $passwordModal.modal({
                    backdrop: 'static',
                    keyboard: false
                });
                // focus password input
                $passwordDecrypt.focus();
                // then re-focus it, when modal causes it to loose focus again
                setTimeout(function () {
                    $passwordDecrypt.focus();
                }, 500);
                return;
            }
 
            // fallback to old method for page template
            password = prompt(I18n._('Please enter the password for this paste:'), '');
            if (password === null) {
                throw 'password prompt canceled';
            }
            if (password.length === 0) {
                // recurse…
                return me.requestPassword();
            }
            PasteDecrypter.run();
        };
 
        /**
         * get the cached password
         *
         * If you do not get a password with this function
         * (returns an empty string), use requestPassword.
         *
         * @name   Prompt.getPassword
         * @function
         * @return {string}
         */
        me.getPassword = function()
        {
            return password;
        };
 
        /**
         * resets the password to an empty string
         *
         * @name   Prompt.reset
         * @function
         */
        me.reset = function()
        {
            // reset internal
            password = '';
 
            // and also reset UI
            $passwordDecrypt.val('');
        }
 
        /**
         * init status manager
         *
         * preloads jQuery elements
         *
         * @name   Prompt.init
         * @function
         */
        me.init = function()
        {
            $passwordDecrypt = $('#passworddecrypt');
            $passwordForm = $('#passwordform');
            $passwordModal = $('#passwordmodal');
 
            // bind events - handle Model password submission
            $passwordForm.submit(submitPasswordModal);
        };
 
        return me;
    })();
 
    /**
     * Manage paste/message input, and preview tab
     *
     * Note that the actual preview is handled by PasteViewer.
     *
     * @name   Editor
     * @class
     */
    const Editor = (function () {
        const me = {};
 
        let $editorTabs,
            $messageEdit,
            $messagePreview,
            $message,
            isPreview = false;
 
        /**
         * support input of tab character
         *
         * @name   Editor.supportTabs
         * @function
         * @param  {Event} event
         * @this $message (but not used, so it is jQuery-free, possibly faster)
         */
        function supportTabs(event)
        {
            const keyCode = event.keyCode || event.which;
            // tab was pressed
            if (keyCode === 9) {
                // get caret position & selection
                const val   = this.value,
                      start = this.selectionStart,
                      end   = this.selectionEnd;
                // set textarea value to: text before caret + tab + text after caret
                this.value = val.substring(0, start) + '\t' + val.substring(end);
                // put caret at right position again
                this.selectionStart = this.selectionEnd = start + 1;
                // prevent the textarea to lose focus
                event.preventDefault();
            }
        }
 
        /**
         * view the Editor tab
         *
         * @name   Editor.viewEditor
         * @function
         * @param  {Event} event - optional
         */
        function viewEditor(event)
        {
            // toggle buttons
            $messageEdit.addClass('active');
            $messagePreview.removeClass('active');
 
            $('#messageedit').attr('aria-selected','true');
            $('#messagepreview').attr('aria-selected','false');
 
            PasteViewer.hide();
 
            // reshow input
            $message.removeClass('hidden');
 
            me.focusInput();
 
            // finish
            isPreview = false;
 
            // prevent jumping of page to top
            Eif (typeof event !== 'undefined') {
                event.preventDefault();
            }
        }
 
        /**
         * view the preview tab
         *
         * @name   Editor.viewPreview
         * @function
         * @param  {Event} event
         */
        function viewPreview(event)
        {
            // toggle buttons
            $messageEdit.removeClass('active');
            $messagePreview.addClass('active');
 
            $('#messageedit').attr('aria-selected','false');
            $('#messagepreview').attr('aria-selected','true');
 
            // hide input as now preview is shown
            $message.addClass('hidden');
 
            // show preview
            PasteViewer.setText($message.val());
            Eif (AttachmentViewer.hasAttachmentData()) {
                const attachment = AttachmentViewer.getAttachment();
                AttachmentViewer.handleBlobAttachmentPreview(
                    AttachmentViewer.getAttachmentPreview(),
                    attachment[0], attachment[1]
                );
            }
            PasteViewer.run();
 
            // finish
            isPreview = true;
 
            // prevent jumping of page to top
            Eif (typeof event !== 'undefined') {
                event.preventDefault();
            }
        }
 
        /**
         * get the state of the preview
         *
         * @name   Editor.isPreview
         * @function
         */
        me.isPreview = function()
        {
            return isPreview;
        };
 
        /**
         * reset the Editor view
         *
         * @name   Editor.resetInput
         * @function
         */
        me.resetInput = function()
        {
            // go back to input
            if (isPreview) {
                viewEditor();
            }
 
            // clear content
            $message.val('');
        };
 
        /**
         * shows the Editor
         *
         * @name   Editor.show
         * @function
         */
        me.show = function()
        {
            $message.removeClass('hidden');
            $editorTabs.removeClass('hidden');
        };
 
        /**
         * hides the Editor
         *
         * @name   Editor.hide
         * @function
         */
        me.hide = function()
        {
            $message.addClass('hidden');
            $editorTabs.addClass('hidden');
        };
 
        /**
         * focuses the message input
         *
         * @name   Editor.focusInput
         * @function
         */
        me.focusInput = function()
        {
            $message.focus();
        };
 
        /**
         * sets a new text
         *
         * @name   Editor.setText
         * @function
         * @param {string} newText
         */
        me.setText = function(newText)
        {
            $message.val(newText);
        };
 
        /**
         * returns the current text
         *
         * @name   Editor.getText
         * @function
         * @return {string}
         */
        me.getText = function()
        {
            return $message.val();
        };
 
        /**
         * init status manager
         *
         * preloads jQuery elements
         *
         * @name   Editor.init
         * @function
         */
        me.init = function()
        {
            $editorTabs = $('#editorTabs');
            $message = $('#message');
 
            // bind events
            $message.keydown(supportTabs);
 
            // bind click events to tab switchers (a), but save parent of them
            // (li)
            $messageEdit = $('#messageedit').click(viewEditor).parent();
            $messagePreview = $('#messagepreview').click(viewPreview).parent();
        };
 
        return me;
    })();
 
    /**
     * (view) Parse and show paste.
     *
     * @name   PasteViewer
     * @class
     */
    const PasteViewer = (function () {
        const me = {};
 
        let $placeholder,
            $prettyMessage,
            $prettyPrint,
            $plainText,
            text,
            format = 'plaintext',
            isDisplayed = false,
            isChanged = true; // by default true as nothing was parsed yet
 
        /**
         * apply the set format on paste and displays it
         *
         * @name   PasteViewer.parsePaste
         * @private
         * @function
         */
        function parsePaste()
        {
            // skip parsing if no text is given
            if (text === '') {
                return;
            }
 
            if (format === 'markdown') {
                const converter = new showdown.Converter({
                    strikethrough: true,
                    tables: true,
                    tablesHeaderId: true,
                    simplifiedAutoLink: true,
                    excludeTrailingPunctuationFromURLs: true
                });
                // let showdown convert the HTML and sanitize HTML *afterwards*!
                $plainText.html(
                    DOMPurify.sanitize(
                        converter.makeHtml(text),
                        purifyHtmlConfig
                    )
                );
                // add table classes from bootstrap css
                $plainText.find('table').addClass('table-condensed table-bordered');
            } else {
                if (format === 'syntaxhighlighting') {
                    // yes, this is really needed to initialize the environment
                    Eif (typeof prettyPrint === 'function')
                    {
                        prettyPrint();
                    }
 
                    $prettyPrint.html(
                        prettyPrintOne(
                            Helper.htmlEntities(text), null, true
                        )
                    );
                } else {
                    // = 'plaintext'
                    $prettyPrint.text(text);
                }
                Helper.urls2links($prettyPrint);
                $prettyPrint.css('white-space', 'pre-wrap');
                $prettyPrint.css('word-break', 'normal');
                $prettyPrint.removeClass('prettyprint');
            }
        }
 
        /**
         * displays the paste
         *
         * @name   PasteViewer.showPaste
         * @private
         * @function
         */
        function showPaste()
        {
            // instead of "nothing" better display a placeholder
            if (text === '') {
                $placeholder.removeClass('hidden');
                return;
            }
            // otherwise hide the placeholder
            $placeholder.addClass('hidden');
 
            switch (format) {
                case 'markdown':
                    $plainText.removeClass('hidden');
                    $prettyMessage.addClass('hidden');
                    break;
                default:
                    $plainText.addClass('hidden');
                    $prettyMessage.removeClass('hidden');
                    break;
            }
        }
 
        /**
         * sets the format in which the text is shown
         *
         * @name   PasteViewer.setFormat
         * @function
         * @param {string} newFormat the new format
         */
        me.setFormat = function(newFormat)
        {
            // skip if there is no update
            if (format === newFormat) {
                return;
            }
 
            // needs to update display too, if we switch from or to Markdown
            if (format === 'markdown' || newFormat === 'markdown') {
                isDisplayed = false;
            }
 
            format = newFormat;
            isChanged = true;
        };
 
        /**
         * returns the current format
         *
         * @name   PasteViewer.getFormat
         * @function
         * @return {string}
         */
        me.getFormat = function()
        {
            return format;
        };
 
        /**
         * returns whether the current view is pretty printed
         *
         * @name   PasteViewer.isPrettyPrinted
         * @function
         * @return {bool}
         */
        me.isPrettyPrinted = function()
        {
            return $prettyPrint.hasClass('prettyprinted');
        };
 
        /**
         * sets the text to show
         *
         * @name   PasteViewer.setText
         * @function
         * @param {string} newText the text to show
         */
        me.setText = function(newText)
        {
            if (text !== newText) {
                text = newText;
                isChanged = true;
            }
        };
 
        /**
         * gets the current cached text
         *
         * @name   PasteViewer.getText
         * @function
         * @return {string}
         */
        me.getText = function()
        {
            return text;
        };
 
        /**
         * show/update the parsed text (preview)
         *
         * @name   PasteViewer.run
         * @function
         */
        me.run = function()
        {
            if (isChanged) {
                parsePaste();
                isChanged = false;
            }
 
            Eif (!isDisplayed) {
                showPaste();
                isDisplayed = true;
            }
        };
 
        /**
         * hide parsed text (preview)
         *
         * @name   PasteViewer.hide
         * @function
         */
        me.hide = function()
        {
            Iif (!isDisplayed) {
                return;
            }
 
            $plainText.addClass('hidden');
            $prettyMessage.addClass('hidden');
            $placeholder.addClass('hidden');
            AttachmentViewer.hideAttachmentPreview();
 
            isDisplayed = false;
        };
 
        /**
         * init status manager
         *
         * preloads jQuery elements
         *
         * @name   PasteViewer.init
         * @function
         */
        me.init = function()
        {
            $placeholder = $('#placeholder');
            $plainText = $('#plaintext');
            $prettyMessage = $('#prettymessage');
            $prettyPrint = $('#prettyprint');
 
            // get default option from template/HTML or fall back to set value
            format = Model.getFormatDefault() || format;
            text = '';
            isDisplayed = false;
            isChanged = true;
        };
 
        return me;
    })();
 
    /**
     * (view) Show attachment and preview if possible
     *
     * @name   AttachmentViewer
     * @class
     */
    const AttachmentViewer = (function () {
        const me = {};
 
        let $attachmentLink,
            $attachmentPreview,
            $attachment,
            attachmentData,
            file,
            $fileInput,
            $dragAndDropFileName,
            attachmentHasPreview = false,
            $dropzone;
 
        /**
         * get blob URL from string data and mime type
         *
         * @name   AttachmentViewer.getBlobUrl
         * @private
         * @function
         * @param {string} data - raw data of attachment
         * @param {string} data - mime type of attachment
         * @return {string} objectURL
         */
         function getBlobUrl(data, mimeType)
         {
            // Transform into a Blob
            const buf = new Uint8Array(data.length);
            for (let i = 0; i < data.length; ++i) {
                buf[i] = data.charCodeAt(i);
            }
            const blob = new window.Blob(
                [buf],
                {
                    type: mimeType
                }
            );
 
            // Get blob URL
            return window.URL.createObjectURL(blob);
         }
 
         /**
         * sets the attachment but does not yet show it
         *
         * @name   AttachmentViewer.setAttachment
         * @function
         * @param {string} attachmentData - base64-encoded data of file
         * @param {string} fileName - optional, file name
         */
        me.setAttachment = function(attachmentData, fileName)
        {
            // skip, if attachments got disabled
            Iif (!$attachmentLink || !$attachmentPreview) return;
 
            // data URI format: data:[<mimeType>][;base64],<data>
 
            // position in data URI string of where data begins
            const base64Start = attachmentData.indexOf(',') + 1;
            // position in data URI string of where mimeType ends
            const mimeTypeEnd = attachmentData.indexOf(';');
 
            // extract mimeType
            const mimeType = attachmentData.substring(5, mimeTypeEnd);
            // extract data and convert to binary
            const rawData = attachmentData.substring(base64Start);
            const decodedData = rawData.length > 0 ? atob(rawData) : '';
 
            let blobUrl = getBlobUrl(decodedData, mimeType);
            $attachmentLink.attr('href', blobUrl);
 
            if (typeof fileName !== 'undefined') {
                $attachmentLink.attr('download', fileName);
            }
 
            // sanitize SVG preview
            // prevents executing embedded scripts when CSP is not set and user
            // right-clicks/long-taps and opens the SVG in a new tab - prevented
            // in the preview by use of an img tag, which disables scripts, too
            Iif (mimeType.match(/^image\/.*svg/i)) {
                const sanitizedData = DOMPurify.sanitize(
                    decodedData,
                    purifySvgConfig
                );
                blobUrl = getBlobUrl(sanitizedData, mimeType);
            }
 
            me.handleBlobAttachmentPreview($attachmentPreview, blobUrl, mimeType);
        };
 
        /**
         * displays the attachment
         *
         * @name AttachmentViewer.showAttachment
         * @function
         */
        me.showAttachment = function()
        {
            // skip, if attachments got disabled
            Iif (!$attachment || !$attachmentPreview) return;
 
            $attachment.removeClass('hidden');
 
            if (attachmentHasPreview) {
                $attachmentPreview.removeClass('hidden');
            }
        };
 
        /**
         * removes the attachment
         *
         * This automatically hides the attachment containers too, to
         * prevent an inconsistent display.
         *
         * @name AttachmentViewer.removeAttachment
         * @function
         */
        me.removeAttachment = function()
        {
            Iif (!$attachment.length) {
                return;
            }
            me.hideAttachment();
            me.hideAttachmentPreview();
            $attachmentLink.removeAttr('href');
            $attachmentLink.removeAttr('download');
            $attachmentLink.off('click');
            $attachmentPreview.html('');
            $dragAndDropFileName.text('');
 
            AttachmentViewer.removeAttachmentData();
        };
 
        /**
         * removes the attachment data
         *
         * This removes the data, which would be uploaded otherwise.
         *
         * @name AttachmentViewer.removeAttachmentData
         * @function
         */
        me.removeAttachmentData = function()
        {
            file = undefined;
            attachmentData = undefined;
        };
 
        /**
         * Cleares the drag & drop data.
         *
         * @name AttachmentViewer.clearDragAndDrop
         * @function
         */
        me.clearDragAndDrop = function()
        {
            $dragAndDropFileName.text('');
        };
 
        /**
         * hides the attachment
         *
         * This will not hide the preview (see AttachmentViewer.hideAttachmentPreview
         * for that) nor will it hide the attachment link if it was moved somewhere
         * else (see AttachmentViewer.moveAttachmentTo).
         *
         * @name AttachmentViewer.hideAttachment
         * @function
         */
        me.hideAttachment = function()
        {
            $attachment.addClass('hidden');
        };
 
        /**
         * hides the attachment preview
         *
         * @name AttachmentViewer.hideAttachmentPreview
         * @function
         */
        me.hideAttachmentPreview = function()
        {
            Eif ($attachmentPreview) {
                $attachmentPreview.addClass('hidden');
            }
        };
 
        /**
         * checks if there is an attachment displayed
         *
         * @name   AttachmentViewer.hasAttachment
         * @function
         */
        me.hasAttachment = function()
        {
            Iif (!$attachment.length) {
                return false;
            }
            const link = $attachmentLink.prop('href');
            return (typeof link !== 'undefined' && link !== '');
        };
 
        /**
         * checks if there is attachment data (for preview!) available
         *
         * It returns true, when there is data that needs to be encrypted.
         *
         * @name   AttachmentViewer.hasAttachmentData
         * @function
         */
        me.hasAttachmentData = function()
        {
            Eif ($attachment.length) {
                return true;
            }
            return false;
        };
 
        /**
         * return the attachment
         *
         * @name   AttachmentViewer.getAttachment
         * @function
         * @returns {array}
         */
        me.getAttachment = function()
        {
            return [
                $attachmentLink.prop('href'),
                $attachmentLink.prop('download')
            ];
        };
 
        /**
         * moves the attachment link to another element
         *
         * It is advisable to hide the attachment afterwards (AttachmentViewer.hideAttachment)
         *
         * @name   AttachmentViewer.moveAttachmentTo
         * @function
         * @param {jQuery} $element - the wrapper/container element where this should be moved to
         * @param {string} label - the text to show (%s will be replaced with the file name), will automatically be translated
         */
        me.moveAttachmentTo = function($element, label)
        {
            // move elemement to new place
            $attachmentLink.appendTo($element);
 
            // update text - ensuring no HTML is inserted into the text node
            I18n._($attachmentLink, label, $attachmentLink.attr('download'));
        };
 
        /**
         * read file data as data URL using the FileReader API
         *
         * @name   AttachmentViewer.readFileData
         * @private
         * @function
         * @param {object} loadedFile (optional) loaded file object
         * @see {@link https://developer.mozilla.org/en-US/docs/Web/API/FileReader#readAsDataURL()}
         */
        function readFileData(loadedFile) {
            if (typeof FileReader === 'undefined') {
                // revert loading status…
                me.hideAttachment();
                me.hideAttachmentPreview();
                Alert.showWarning('Your browser does not support uploading encrypted files. Please use a newer browser.');
                return;
            }
 
            const fileReader = new FileReader();
            if (loadedFile === undefined) {
                loadedFile = $fileInput[0].files[0];
                $dragAndDropFileName.text('');
            } else {
                $dragAndDropFileName.text(loadedFile.name);
            }
 
            if (typeof loadedFile !== 'undefined') {
                file = loadedFile;
                fileReader.onload = function (event) {
                    const dataURL = event.target.result;
                    attachmentData = dataURL;
 
                    if (Editor.isPreview()) {
                        me.handleAttachmentPreview($attachmentPreview, dataURL);
                        $attachmentPreview.removeClass('hidden');
                    }
 
                    TopNav.highlightFileupload();
                };
                fileReader.readAsDataURL(loadedFile);
            } else {
                me.removeAttachmentData();
            }
        }
 
        /**
         * handle the preview of files decoded to blob that can either be an image, video, audio or pdf element
         *
         * @name   AttachmentViewer.handleBlobAttachmentPreview
         * @function
         * @argument {jQuery} $targetElement element where the preview should be appended
         * @argument {string} file as a blob URL
         * @argument {string} mime type
         */
        me.handleBlobAttachmentPreview = function ($targetElement, blobUrl, mimeType) {
            if (blobUrl) {
                attachmentHasPreview = true;
                if (mimeType.match(/^image\//i)) {
                    $targetElement.html(
                        $(document.createElement('img'))
                            .attr('src', blobUrl)
                            .attr('class', 'img-thumbnail')
                    );
                } else if (mimeType.match(/^video\//i)) {
                    $targetElement.html(
                        $(document.createElement('video'))
                            .attr('controls', 'true')
                            .attr('autoplay', 'true')
                            .attr('class', 'img-thumbnail')
 
                            .append($(document.createElement('source'))
                            .attr('type', mimeType)
                            .attr('src', blobUrl))
                    );
                } else if (mimeType.match(/^audio\//i)) {
                    $targetElement.html(
                        $(document.createElement('audio'))
                            .attr('controls', 'true')
                            .attr('autoplay', 'true')
 
                            .append($(document.createElement('source'))
                            .attr('type', mimeType)
                            .attr('src', blobUrl))
                    );
                } else Iif (mimeType.match(/\/pdf/i)) {
                    // Fallback for browsers, that don't support the vh unit
                    const clientHeight = $(window).height();
 
                    $targetElement.html(
                        $(document.createElement('embed'))
                            .attr('src', blobUrl)
                            .attr('type', 'application/pdf')
                            .attr('class', 'pdfPreview')
                            .css('height', clientHeight)
                    );
                } else {
                    attachmentHasPreview = false;
                }
            }
        };
 
        /**
         * attaches the file attachment drag & drop handler to the page
         *
         * @name   AttachmentViewer.addDragDropHandler
         * @private
         * @function
         */
        function addDragDropHandler() {
            Eif (typeof $fileInput === 'undefined' || $fileInput.length === 0) {
                return;
            }
 
            const handleDragEnterOrOver = function(event) {
                event.stopPropagation();
                event.preventDefault();
                return false;
            };
 
            const handleDrop = function(event) {
                const evt = event.originalEvent;
                evt.stopPropagation();
                evt.preventDefault();
 
                if (TopNav.isAttachmentReadonly()) {
                    return false;
                }
 
                if ($fileInput) {
                    const file = evt.dataTransfer.files[0];
                    //Clear the file input:
                    $fileInput.wrap('<form>').closest('form').get(0).reset();
                    $fileInput.unwrap();
                    //Only works in Chrome:
                    //fileInput[0].files = e.dataTransfer.files;
 
                    readFileData(file);
                }
            };
 
            $(document).draghover().on({
                'draghoverstart': function(e) {
                    if (TopNav.isAttachmentReadonly()) {
                        e.stopPropagation();
                        e.preventDefault();
                        return false;
                    }
                    // show dropzone to indicate drop support
                    $dropzone.removeClass('hidden');
                },
                'draghoverend': function() {
                    $dropzone.addClass('hidden');
                }
            });
 
            $(document).on('drop', handleDrop);
            $(document).on('dragenter dragover', handleDragEnterOrOver);
 
            $fileInput.on('change', function () {
                readFileData();
            });
        }
 
        /**
         * attaches the clipboard attachment handler to the page
         *
         * @name   AttachmentViewer.addClipboardEventHandler
         * @private
         * @function
         */
        function addClipboardEventHandler() {
            $(document).on('paste', function (event) {
                const items = (event.clipboardData || event.originalEvent.clipboardData).items;
                const lastItem = items[items.length - 1];
                if (lastItem.kind === 'file') {
                    if (TopNav.isAttachmentReadonly()) {
                        event.stopPropagation();
                        event.preventDefault();
                        return false;
                    } else {
                        readFileData(lastItem.getAsFile());
                    }
                }
            });
        }
 
 
        /**
         * getter for attachment data
         *
         * @name   AttachmentViewer.getAttachmentData
         * @function
         * @return {jQuery}
         */
        me.getAttachmentData = function () {
            return attachmentData;
        };
 
        /**
         * getter for attachment link
         *
         * @name   AttachmentViewer.getAttachmentLink
         * @function
         * @return {jQuery}
         */
        me.getAttachmentLink = function () {
            return $attachmentLink;
        };
 
        /**
         * getter for attachment preview
         *
         * @name   AttachmentViewer.getAttachmentPreview
         * @function
         * @return {jQuery}
         */
        me.getAttachmentPreview = function () {
            return $attachmentPreview;
        };
 
        /**
         * getter for file data, returns the file contents
         *
         * @name   AttachmentViewer.getFile
         * @function
         * @return {string}
         */
        me.getFile = function () {
            return file;
        };
 
        /**
         * initiate
         *
         * preloads jQuery elements
         *
         * @name   AttachmentViewer.init
         * @function
         */
        me.init = function()
        {
            $attachment = $('#attachment');
            $dragAndDropFileName = $('#dragAndDropFileName');
            $dropzone = $('#dropzone');
            $attachmentLink = $('#attachment a') || $('<a>');
            if($attachment.length) {
                $attachmentPreview = $('#attachmentPreview');
 
                $fileInput = $('#file');
                addDragDropHandler();
                addClipboardEventHandler();
            }
        }
 
        return me;
    })();
 
    /**
     * (view) Shows discussion thread and handles replies
     *
     * @name   DiscussionViewer
     * @class
     */
    const DiscussionViewer = (function () {
        const me = {};
 
        let $commentTail,
            $discussion,
            $reply,
            $replyMessage,
            $replyNickname,
            $replyStatus,
            $commentContainer,
            replyCommentId;
 
        /**
         * initializes the templates
         *
         * @name   DiscussionViewer.initTemplates
         * @private
         * @function
         */
        function initTemplates()
        {
            $reply = Model.getTemplate('reply');
            $replyMessage = $reply.find('#replymessage');
            $replyNickname = $reply.find('#nickname');
            $replyStatus = $reply.find('#replystatus');
 
            // cache jQuery elements
            $commentTail = Model.getTemplate('commenttail');
        }
 
        /**
         * open the comment entry when clicking the "Reply" button of a comment
         *
         * @name   DiscussionViewer.openReply
         * @private
         * @function
         * @param  {Event} event
         */
        function openReply(event)
        {
            const $source = $(event.target);
 
            // clear input
            $replyMessage.val('');
            $replyNickname.val('');
 
            // get comment id from source element
            replyCommentId = $source.parent().prop('id').split('_')[1];
 
            // move to correct position
            $source.after($reply);
 
            // show
            $reply.removeClass('hidden');
            $replyMessage.focus();
 
            event.preventDefault();
        }
 
        /**
         * custom handler for displaying notifications in own status message area
         *
         * @name   DiscussionViewer.handleNotification
         * @function
         * @param  {string} alertType
         * @return {bool|jQuery}
         */
        me.handleNotification = function(alertType)
        {
            // ignore loading messages
            if (alertType === 'loading') {
                return false;
            }
 
            if (alertType === 'danger') {
                $replyStatus.removeClass('alert-info');
                $replyStatus.addClass('alert-danger');
                $replyStatus.find(':first').removeClass('glyphicon-alert');
                $replyStatus.find(':first').addClass('glyphicon-info-sign');
            } else {
                $replyStatus.removeClass('alert-danger');
                $replyStatus.addClass('alert-info');
                $replyStatus.find(':first').removeClass('glyphicon-info-sign');
                $replyStatus.find(':first').addClass('glyphicon-alert');
            }
 
            return $replyStatus;
        };
 
        /**
         * adds another comment
         *
         * @name   DiscussionViewer.addComment
         * @function
         * @param {Comment} comment
         * @param {string} commentText
         * @param {string} nickname
         */
        me.addComment = function(comment, commentText, nickname)
        {
            if (commentText === '') {
                commentText = 'comment decryption failed';
            }
 
            // create new comment based on template
            const $commentEntry = Model.getTemplate('comment');
            $commentEntry.prop('id', 'comment_' + comment.id);
            const $commentEntryData = $commentEntry.find('div.commentdata');
 
            // set & parse text
            $commentEntryData.text(commentText);
            Helper.urls2links($commentEntryData);
 
            // set nickname
            if (nickname.length > 0) {
                $commentEntry.find('span.nickname').text(nickname);
            } else {
                $commentEntry.find('span.nickname').html('<i></i>');
                I18n._($commentEntry.find('span.nickname i'), 'Anonymous');
            }
 
            // set date
            $commentEntry.find('span.commentdate')
                      .text(' (' + (new Date(comment.getCreated() * 1000).toLocaleString()) + ')')
                      .attr('title', 'CommentID: ' + comment.id);
 
            // if an avatar is available, display it
            const icon = comment.getIcon();
            if (icon) {
                $commentEntry.find('span.nickname')
                             .before(
                                '<img src="' + icon + '" class="vizhash" /> '
                             );
                $(document).on('languageLoaded', function () {
                    $commentEntry.find('img.vizhash')
                                 .prop('title', I18n._('Avatar generated from IP address'));
                });
            }
 
            // starting point (default value/fallback)
            let $place = $commentContainer;
 
            // if parent comment exists
            const $parentComment = $('#comment_' + comment.parentid);
            Iif ($parentComment.length) {
                // use parent as position for new comment, so it is shifted
                // to the right
                $place = $parentComment;
            }
 
            // finally append comment
            $place.append($commentEntry);
        };
 
        /**
         * finishes the discussion area after last comment
         *
         * @name   DiscussionViewer.finishDiscussion
         * @function
         */
        me.finishDiscussion = function()
        {
            // add 'add new comment' area
            $commentContainer.append($commentTail);
 
            // show discussions
            $discussion.removeClass('hidden');
        };
 
        /**
         * removes the old discussion and prepares everything for creating a new
         * one.
         *
         * @name   DiscussionViewer.prepareNewDiscussion
         * @function
         */
        me.prepareNewDiscussion = function()
        {
            $commentContainer.html('');
            $discussion.addClass('hidden');
 
            // (re-)init templates
            initTemplates();
        };
 
        /**
         * returns the users message from the reply form
         *
         * @name   DiscussionViewer.getReplyMessage
         * @function
         * @return {String}
         */
        me.getReplyMessage = function()
        {
            return $replyMessage.val();
        };
 
        /**
         * returns the users nickname (if any) from the reply form
         *
         * @name   DiscussionViewer.getReplyNickname
         * @function
         * @return {String}
         */
        me.getReplyNickname = function()
        {
            return $replyNickname.val();
        };
 
        /**
         * returns the id of the parent comment the user is replying to
         *
         * @name   DiscussionViewer.getReplyCommentId
         * @function
         * @return {int|undefined}
         */
        me.getReplyCommentId = function()
        {
            return replyCommentId;
        };
 
        /**
         * highlights a specific comment and scrolls to it if necessary
         *
         * @name   DiscussionViewer.highlightComment
         * @function
         * @param {string} commentId
         * @param {bool} fadeOut - whether to fade out the comment
         */
        me.highlightComment = function(commentId, fadeOut)
        {
            const $comment = $('#comment_' + commentId);
            // in case comment does not exist, cancel
            Iif ($comment.length === 0) {
                return;
            }
 
            $comment.addClass('highlight');
            const highlightComment = function () {
                if (fadeOut === true) {
                    setTimeout(function () {
                        $comment.removeClass('highlight');
                    }, 300);
                }
            };
 
            Iif (UiHelper.isVisible($comment)) {
                return highlightComment();
            }
 
            UiHelper.scrollTo($comment, 100, 'swing', highlightComment);
        };
 
        /**
         * initiate
         *
         * preloads jQuery elements
         *
         * @name   DiscussionViewer.init
         * @function
         */
        me.init = function()
        {
            // bind events to templates (so they are later cloned)
            $('#commenttailtemplate, #commenttemplate').find('button').on('click', openReply);
            $('#replytemplate').find('button').on('click', PasteEncrypter.sendComment);
 
            $commentContainer = $('#commentcontainer');
            $discussion = $('#discussion');
        };
 
        return me;
    })();
 
    /**
     * Manage top (navigation) bar
     *
     * @name   TopNav
     * @param  {object} window
     * @param  {object} document
     * @class
     */
    const TopNav = (function (window, document) {
        const me = {};
 
        let createButtonsDisplayed = false,
            viewButtonsDisplayed = false,
            burnAfterReadingDefault = false,
            openDiscussionDefault = false,
            $attach,
            $burnAfterReading,
            $burnAfterReadingOption,
            $cloneButton,
            $customAttachment,
            $expiration,
            $fileRemoveButton,
            $fileWrap,
            $formatter,
            $newButton,
            $openDiscussion,
            $openDiscussionOption,
            $password,
            $passwordInput,
            $rawTextButton,
            $downloadTextButton,
            $qrCodeLink,
            $emailLink,
            $sendButton,
            $retryButton,
            pasteExpiration = null,
            retryButtonCallback;
 
        /**
         * set the expiration on bootstrap templates in dropdown
         *
         * @name   TopNav.updateExpiration
         * @private
         * @function
         * @param  {Event} event
         */
        function updateExpiration(event)
        {
            // get selected option
            const target = $(event.target);
 
            // update dropdown display and save new expiration time
            $('#pasteExpirationDisplay').text(target.text());
            pasteExpiration = target.data('expiration');
 
            event.preventDefault();
        }
 
        /**
         * set the format on bootstrap templates in dropdown from user interaction
         *
         * @name   TopNav.updateFormat
         * @private
         * @function
         * @param  {Event} event
         */
        function updateFormat(event)
        {
            // get selected option
            const $target = $(event.target);
 
            // update dropdown display and save new format
            const newFormat = $target.data('format');
            $('#pasteFormatterDisplay').text($target.text());
            PasteViewer.setFormat(newFormat);
 
            // update preview
            if (Editor.isPreview()) {
                PasteViewer.run();
            }
 
            event.preventDefault();
        }
 
        /**
         * when "burn after reading" is checked, disable discussion
         *
         * @name   TopNav.changeBurnAfterReading
         * @private
         * @function
         */
        function changeBurnAfterReading()
        {
            if (me.getBurnAfterReading()) {
                $openDiscussionOption.addClass('buttondisabled');
                $openDiscussion.prop('checked', false);
 
                // if button is actually disabled, force-enable it and uncheck other button
                $burnAfterReadingOption.removeClass('buttondisabled');
            } else {
                $openDiscussionOption.removeClass('buttondisabled');
            }
        }
 
        /**
         * when discussion is checked, disable "burn after reading"
         *
         * @name   TopNav.changeOpenDiscussion
         * @private
         * @function
         */
        function changeOpenDiscussion()
        {
            if (me.getOpenDiscussion()) {
                $burnAfterReadingOption.addClass('buttondisabled');
                $burnAfterReading.prop('checked', false);
 
                // if button is actually disabled, force-enable it and uncheck other button
                $openDiscussionOption.removeClass('buttondisabled');
            } else {
                $burnAfterReadingOption.removeClass('buttondisabled');
            }
        }
 
 
        /**
         * Clear the attachment input in the top navigation.
         *
         * @name   TopNav.clearAttachmentInput
         * @function
         */
        function clearAttachmentInput()
        {
            // hide UI for selected files
            // our up-to-date jQuery can handle it :)
            $fileWrap.find('input').val('');
        }
 
        /**
         * return raw text
         *
         * @name   TopNav.rawText
         * @private
         * @function
         */
        function rawText()
        {
            TopNav.hideAllButtons();
            Alert.showLoading('Showing raw text…', 'time');
            let paste = PasteViewer.getText();
 
            // push a new state to allow back navigation with browser back button
            history.pushState(
                {type: 'raw'},
                document.title,
                // recreate paste URL
                Helper.baseUri() + '?' + Model.getPasteId() + '#' +
                CryptTool.base58encode(Model.getPasteKey())
            );
 
            // we use text/html instead of text/plain to avoid a bug when
            // reloading the raw text view (it reverts to type text/html)
            const $head  = $('head').children().not('noscript, script, link[type="text/css"]'),
                  newDoc = document.open('text/html', 'replace');
            newDoc.write('<!DOCTYPE html><html><head>');
            for (let i = 0; i < $head.length; ++i) {
                newDoc.write($head[i].outerHTML);
            }
            newDoc.write(
                '</head><body><pre>' +
                DOMPurify.sanitize(
                    Helper.htmlEntities(paste),
                    purifyHtmlConfig
                ) +
                '</pre></body></html>'
            );
            newDoc.close();
        }
 
        /**
         * download text
         *
         * @name   TopNav.downloadText
         * @private
         * @function
         */
        function downloadText()
        {
            var filename='paste-' + Model.getPasteId() + '.txt';
            var text = PasteViewer.getText();
 
            var element = document.createElement('a');
            element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
            element.setAttribute('download', filename);
 
            element.style.display = 'none';
            document.body.appendChild(element);
 
            element.click();
 
            document.body.removeChild(element);
        }
 
        /**
         * saves the language in a cookie and reloads the page
         *
         * @name   TopNav.setLanguage
         * @private
         * @function
         * @param  {Event} event
         */
        function setLanguage(event)
        {
            document.cookie = 'lang=' + $(event.target).data('lang') + ';secure';
            UiHelper.reloadHome();
            event.preventDefault();
        }
 
        /**
         * hides all messages and creates a new paste
         *
         * @name   TopNav.clickNewPaste
         * @private
         * @function
         */
        function clickNewPaste()
        {
            Controller.hideStatusMessages();
            Controller.newPaste();
        }
 
        /**
         * retrys some callback registered before
         *
         * @name   TopNav.clickRetryButton
         * @private
         * @function
         * @param  {Event} event
         */
        function clickRetryButton(event)
        {
            retryButtonCallback(event);
        }
 
        /**
         * removes the existing attachment
         *
         * @name   TopNav.removeAttachment
         * @private
         * @function
         * @param  {Event} event
         */
        function removeAttachment(event)
        {
            // if custom attachment is used, remove it first
            if (!$customAttachment.hasClass('hidden')) {
                AttachmentViewer.removeAttachment();
                $customAttachment.addClass('hidden');
                $fileWrap.removeClass('hidden');
            }
 
            // in any case, remove saved attachment data
            AttachmentViewer.removeAttachmentData();
 
            clearAttachmentInput();
            AttachmentViewer.clearDragAndDrop();
 
            // pevent '#' from appearing in the URL
            event.preventDefault();
        }
 
        /**
         * Shows the QR code of the current paste (URL).
         *
         * @name   TopNav.displayQrCode
         * @private
         * @function
         */
        function displayQrCode()
        {
            const qrCanvas = kjua({
                render: 'canvas',
                text: window.location.href
            });
            $('#qrcode-display').html(qrCanvas);
        }
 
        /**
         * Template Email body.
         *
         * @name   TopNav.templateEmailBody
         * @private
         * @param {string} expirationDateString
         * @param {bool} isBurnafterreading
         */
        function templateEmailBody(expirationDateString, isBurnafterreading)
        {
            const EOL = '\n';
            const BULLET = '  - ';
            let emailBody = '';
            if (expirationDateString !== null || isBurnafterreading) {
                emailBody += I18n._('Notice:');
                emailBody += EOL;
 
                if (expirationDateString !== null) {
                    emailBody += EOL;
                    emailBody += BULLET;
                    // avoid DOMPurify mess with forward slash in expirationDateString
                    emailBody += Helper.sprintf(
                        I18n._(
                            'This link will expire after %s.',
                            '%s'
                        ),
                        expirationDateString
                    );
                }
                if (isBurnafterreading) {
                    emailBody += EOL;
                    emailBody += BULLET;
                    emailBody += I18n._(
                        'This link can only be accessed once, do not use back or refresh button in your browser.'
                    );
                }
 
                emailBody += EOL;
                emailBody += EOL;
            }
            emailBody += I18n._('Link:');
            emailBody += EOL;
            emailBody += `${window.location.href}`;
            return emailBody;
        }
 
        /**
         * Trigger Email send.
         *
         * @name   TopNav.triggerEmailSend
         * @private
         * @param {string} emailBody
         */
        function triggerEmailSend(emailBody)
        {
            window.open(
                `mailto:?body=${encodeURIComponent(emailBody)}`,
                '_self',
                'noopener, noreferrer'
            );
        }
 
        /**
         * Send Email with current paste (URL).
         *
         * @name   TopNav.sendEmail
         * @private
         * @function
         * @param  {Date|null} expirationDate date of expiration
         * @param  {bool} isBurnafterreading whether it is burn after reading
         */
        function sendEmail(expirationDate, isBurnafterreading)
        {
            const expirationDateRoundedToSecond = new Date(expirationDate);
 
            // round down at least 30 seconds to make up for the delay of request
            expirationDateRoundedToSecond.setUTCSeconds(
                expirationDateRoundedToSecond.getUTCSeconds() - 30
            );
            expirationDateRoundedToSecond.setUTCSeconds(0);
 
            const $emailconfirmmodal = $('#emailconfirmmodal');
            if ($emailconfirmmodal.length > 0) {
                if (expirationDate !== null) {
                    const $emailconfirmTimezoneCurrent = $emailconfirmmodal.find('#emailconfirm-timezone-current');
                    const $emailconfirmTimezoneUtc = $emailconfirmmodal.find('#emailconfirm-timezone-utc');
                    $emailconfirmTimezoneCurrent.off('click.sendEmailCurrentTimezone');
                    $emailconfirmTimezoneCurrent.on('click.sendEmailCurrentTimezone', () => {
                        const emailBody = templateEmailBody(expirationDateRoundedToSecond.toLocaleString(), isBurnafterreading);
                        $emailconfirmmodal.modal('hide');
                        triggerEmailSend(emailBody);
                    });
                    $emailconfirmTimezoneUtc.off('click.sendEmailUtcTimezone');
                    $emailconfirmTimezoneUtc.on('click.sendEmailUtcTimezone', () => {
                        const emailBody = templateEmailBody(expirationDateRoundedToSecond.toLocaleString(
                            undefined,
                            // we don't use Date.prototype.toUTCString() because we would like to avoid GMT
                            { timeZone: 'UTC', dateStyle: 'long', timeStyle: 'long' }
                        ), isBurnafterreading);
                        $emailconfirmmodal.modal('hide');
                        triggerEmailSend(emailBody);
                    });
                    $emailconfirmmodal.modal('show');
                } else {
                    triggerEmailSend(templateEmailBody(null, isBurnafterreading));
                }
            } else {
                let emailBody = '';
                if (expirationDate !== null) {
                    const expirationDateString = window.confirm(
                        I18n._('Recipient may become aware of your timezone, convert time to UTC?')
                    ) ? expirationDateRoundedToSecond.toLocaleString(
                        undefined,
                        // we don't use Date.prototype.toUTCString() because we would like to avoid GMT
                        { timeZone: 'UTC', dateStyle: 'long', timeStyle: 'long' }
                    ) : expirationDateRoundedToSecond.toLocaleString();
                    emailBody = templateEmailBody(expirationDateString, isBurnafterreading);
                } else {
                    emailBody = templateEmailBody(null, isBurnafterreading);
                }
                triggerEmailSend(emailBody);
            }
        }
 
        /**
         * Shows all navigation elements for viewing an existing paste
         *
         * @name   TopNav.showViewButtons
         * @function
         */
        me.showViewButtons = function()
        {
            Iif (viewButtonsDisplayed) {
                return;
            }
 
            $newButton.removeClass('hidden');
            $cloneButton.removeClass('hidden');
            $rawTextButton.removeClass('hidden');
            $downloadTextButton.removeClass('hidden');
            $qrCodeLink.removeClass('hidden');
 
            viewButtonsDisplayed = true;
        };
 
        /**
         * Hides all navigation elements for viewing an existing paste
         *
         * @name   TopNav.hideViewButtons
         * @function
         */
        me.hideViewButtons = function()
        {
            Iif (!viewButtonsDisplayed) {
                return;
            }
 
            $cloneButton.addClass('hidden');
            $newButton.addClass('hidden');
            $rawTextButton.addClass('hidden');
            $downloadTextButton.addClass('hidden');
            $qrCodeLink.addClass('hidden');
            me.hideEmailButton();
 
            viewButtonsDisplayed = false;
        };
 
        /**
         * Hides all elements belonging to existing pastes
         *
         * @name   TopNav.hideAllButtons
         * @function
         */
        me.hideAllButtons = function()
        {
            me.hideViewButtons();
            me.hideCreateButtons();
        };
 
        /**
         * shows all elements needed when creating a new paste
         *
         * @name   TopNav.showCreateButtons
         * @function
         */
        me.showCreateButtons = function()
        {
            Iif (createButtonsDisplayed) {
                return;
            }
 
            $attach.removeClass('hidden');
            $burnAfterReadingOption.removeClass('hidden');
            $expiration.removeClass('hidden');
            $formatter.removeClass('hidden');
            $newButton.removeClass('hidden');
            $openDiscussionOption.removeClass('hidden');
            $password.removeClass('hidden');
            $sendButton.removeClass('hidden');
 
            createButtonsDisplayed = true;
        };
 
        /**
         * shows all elements needed when creating a new paste
         *
         * @name   TopNav.hideCreateButtons
         * @function
         */
        me.hideCreateButtons = function()
        {
            Iif (!createButtonsDisplayed) {
                return;
            }
 
            $newButton.addClass('hidden');
            $sendButton.addClass('hidden');
            $expiration.addClass('hidden');
            $formatter.addClass('hidden');
            $burnAfterReadingOption.addClass('hidden');
            $openDiscussionOption.addClass('hidden');
            $password.addClass('hidden');
            $attach.addClass('hidden');
 
            createButtonsDisplayed = false;
        };
 
        /**
         * only shows the "new paste" button
         *
         * @name   TopNav.showNewPasteButton
         * @function
         */
        me.showNewPasteButton = function()
        {
            $newButton.removeClass('hidden');
        };
 
        /**
         * only shows the "retry" button
         *
         * @name   TopNav.showRetryButton
         * @function
         */
        me.showRetryButton = function()
        {
            $retryButton.removeClass('hidden');
        }
 
        /**
         * hides the "retry" button
         *
         * @name   TopNav.hideRetryButton
         * @function
         */
        me.hideRetryButton = function()
        {
            $retryButton.addClass('hidden');
        }
 
        /**
         * show the "email" button
         *
         * @name   TopNav.showEmailbutton
         * @function
         * @param {int|undefined} optionalRemainingTimeInSeconds
         */
        me.showEmailButton = function(optionalRemainingTimeInSeconds)
        {
            try {
                // we cache expiration date in closure to avoid inaccurate expiration datetime
                const expirationDate = Helper.calculateExpirationDate(
                    new Date(),
                    typeof optionalRemainingTimeInSeconds === 'number' ? optionalRemainingTimeInSeconds : TopNav.getExpiration()
                );
                const isBurnafterreading = TopNav.getBurnAfterReading();
 
                $emailLink.removeClass('hidden');
                $emailLink.off('click.sendEmail');
                $emailLink.on('click.sendEmail', () => {
                    sendEmail(expirationDate, isBurnafterreading);
                });
            } catch (error) {
                console.error(error);
                Alert.showError('Cannot calculate expiration date.');
            }
        }
 
        /**
         * hide the "email" button
         *
         * @name   TopNav.hideEmailButton
         * @function
         */
        me.hideEmailButton = function()
        {
            $emailLink.addClass('hidden');
            $emailLink.off('click.sendEmail');
        }
 
        /**
         * only hides the clone button
         *
         * @name   TopNav.hideCloneButton
         * @function
         */
        me.hideCloneButton = function()
        {
            $cloneButton.addClass('hidden');
        };
 
        /**
         * only hides the raw text button
         *
         * @name   TopNav.hideRawButton
         * @function
         */
        me.hideRawButton = function()
        {
            $rawTextButton.addClass('hidden');
        };
 
        /**
         * only hides the download text button
         *
         * @name   TopNav.hideRawButton
         * @function
         */
        me.hideDownloadButton = function()
        {
            $downloadTextButton.addClass('hidden');
        };
 
        /**
         * only hides the qr code button
         *
         * @name   TopNav.hideQrCodeButton
         * @function
         */
        me.hideQrCodeButton = function()
        {
            $qrCodeLink.addClass('hidden');
        }
 
        /**
         * hide all irrelevant buttons when viewing burn after reading paste
         *
         * @name   TopNav.hideBurnAfterReadingButtons
         * @function
         */
        me.hideBurnAfterReadingButtons = function()
        {
            me.hideCloneButton();
            me.hideQrCodeButton();
            me.hideEmailButton();
        }
 
        /**
         * hides the file selector in attachment
         *
         * @name   TopNav.hideFileSelector
         * @function
         */
        me.hideFileSelector = function()
        {
            $fileWrap.addClass('hidden');
        };
 
 
        /**
         * shows the custom attachment
         *
         * @name   TopNav.showCustomAttachment
         * @function
         */
        me.showCustomAttachment = function()
        {
            $customAttachment.removeClass('hidden');
        };
 
        /**
         * hides the custom attachment
         *
         * @name  TopNav.hideCustomAttachment
         * @function
         */
        me.hideCustomAttachment = function()
        {
            $customAttachment.addClass('hidden');
            $fileWrap.removeClass('hidden');
        };
 
        /**
         * collapses the navigation bar, only if expanded
         *
         * @name   TopNav.collapseBar
         * @function
         */
        me.collapseBar = function()
        {
            Iif ($('#navbar').attr('aria-expanded') === 'true') {
                $('.navbar-toggle').click();
            }
        };
 
        /**
         * Reset the top navigation back to it's default values.
         *
         * @name   TopNav.resetInput
         * @function
         */
        me.resetInput = function()
        {
            clearAttachmentInput();
            $burnAfterReading.prop('checked', burnAfterReadingDefault);
            $openDiscussion.prop('checked', openDiscussionDefault);
            if (openDiscussionDefault || !burnAfterReadingDefault) $openDiscussionOption.removeClass('buttondisabled');
            if (burnAfterReadingDefault || !openDiscussionDefault) $burnAfterReadingOption.removeClass('buttondisabled');
 
            pasteExpiration = Model.getExpirationDefault() || pasteExpiration;
            $('#pasteExpiration>option').each(function() {
                const $this = $(this);
                if ($this.val() === pasteExpiration) {
                    $('#pasteExpirationDisplay').text($this.text());
                }
            });
        };
 
        /**
         * returns the currently set expiration time
         *
         * @name   TopNav.getExpiration
         * @function
         * @return {int}
         */
        me.getExpiration = function()
        {
            return pasteExpiration;
        };
 
        /**
         * returns the currently selected file(s)
         *
         * @name   TopNav.getFileList
         * @function
         * @return {FileList|null}
         */
        me.getFileList = function()
        {
            const $file = $('#file');
 
            // if no file given, return null
            if (!$file.length || !$file[0].files.length) {
                return null;
            }
 
            // ensure the selected file is still accessible
            Iif (!($file[0].files && $file[0].files[0])) {
                return null;
            }
 
            return $file[0].files;
        };
 
        /**
         * returns the state of the burn after reading checkbox
         *
         * @name   TopNav.getBurnAfterReading
         * @function
         * @return {bool}
         */
        me.getBurnAfterReading = function()
        {
            return $burnAfterReading.prop('checked');
        };
 
        /**
         * returns the state of the discussion checkbox
         *
         * @name   TopNav.getOpenDiscussion
         * @function
         * @return {bool}
         */
        me.getOpenDiscussion = function()
        {
            return $openDiscussion.prop('checked');
        };
 
        /**
         * returns the entered password
         *
         * @name   TopNav.getPassword
         * @function
         * @return {string}
         */
        me.getPassword = function()
        {
            // when password is disabled $passwordInput.val() will return undefined
            return $passwordInput.val() || '';
        };
 
        /**
         * returns the element where custom attachments can be placed
         *
         * Used by AttachmentViewer when an attachment is cloned here.
         *
         * @name   TopNav.getCustomAttachment
         * @function
         * @return {jQuery}
         */
        me.getCustomAttachment = function()
        {
            return $customAttachment;
        };
 
        /**
         * Set a function to call when the retry button is clicked.
         *
         * @name   TopNav.setRetryCallback
         * @function
         * @param {function} callback
         */
        me.setRetryCallback = function(callback)
        {
            retryButtonCallback = callback;
        }
 
        /**
         * Highlight file upload
         *
         * @name  TopNav.highlightFileupload
         * @function
         */
        me.highlightFileupload = function()
        {
            // visually indicate file uploaded
            const $attachDropdownToggle = $attach.children('.dropdown-toggle');
            if ($attachDropdownToggle.attr('aria-expanded') === 'false') {
                $attachDropdownToggle.click();
            }
            $fileWrap.addClass('highlight');
            setTimeout(function () {
                $fileWrap.removeClass('highlight');
            }, 300);
        }
 
        /**
         * set the format on bootstrap templates in dropdown programmatically
         *
         * @name    TopNav.setFormat
         * @function
         */
        me.setFormat = function(format)
        {
            $formatter.parent().find(`a[data-format="${format}"]`).click();
        }
 
        /**
         * returns if attachment dropdown is readonly, not editable
         *
         * @name   TopNav.isAttachmentReadonly
         * @function
         * @return {bool}
         */
        me.isAttachmentReadonly = function()
        {
            return !createButtonsDisplayed || $attach.hasClass('hidden');
        }
 
        /**
         * init navigation manager
         *
         * preloads jQuery elements
         *
         * @name   TopNav.init
         * @function
         */
        me.init = function()
        {
            $attach = $('#attach');
            $burnAfterReading = $('#burnafterreading');
            $burnAfterReadingOption = $('#burnafterreadingoption');
            $cloneButton = $('#clonebutton');
            $customAttachment = $('#customattachment');
            $expiration = $('#expiration');
            $fileRemoveButton = $('#fileremovebutton');
            $fileWrap = $('#filewrap');
            $formatter = $('#formatter');
            $newButton = $('#newbutton');
            $openDiscussion = $('#opendiscussion');
            $openDiscussionOption = $('#opendiscussionoption');
            $password = $('#password');
            $passwordInput = $('#passwordinput');
            $rawTextButton = $('#rawtextbutton');
            $downloadTextButton = $('#downloadtextbutton');
            $retryButton = $('#retrybutton');
            $sendButton = $('#sendbutton');
            $qrCodeLink = $('#qrcodelink');
            $emailLink = $('#emaillink');
 
            // bootstrap template drop down
            $('#language ul.dropdown-menu li a').click(setLanguage);
            // page template drop down
            $('#language select option').click(setLanguage);
 
            // bind events
            $burnAfterReading.change(changeBurnAfterReading);
            $openDiscussionOption.change(changeOpenDiscussion);
            $newButton.click(clickNewPaste);
            $sendButton.click(PasteEncrypter.sendPaste);
            $cloneButton.click(Controller.clonePaste);
            $rawTextButton.click(rawText);
            $downloadTextButton.click(downloadText);
            $retryButton.click(clickRetryButton);
            $fileRemoveButton.click(removeAttachment);
            $qrCodeLink.click(displayQrCode);
 
            // bootstrap template drop downs
            $('ul.dropdown-menu li a', $('#expiration').parent()).click(updateExpiration);
            $('ul.dropdown-menu li a', $('#formatter').parent()).click(updateFormat);
 
            // initiate default state of checkboxes
            changeBurnAfterReading();
            changeOpenDiscussion();
 
            // get default values from template or fall back to set value
            burnAfterReadingDefault = me.getBurnAfterReading();
            openDiscussionDefault = me.getOpenDiscussion();
            pasteExpiration = Model.getExpirationDefault() || pasteExpiration;
 
            createButtonsDisplayed = false;
            viewButtonsDisplayed = false;
        };
 
        return me;
    })(window, document);
 
    /**
     * Responsible for AJAX requests, transparently handles encryption…
     *
     * @name   ServerInteraction
     * @class
     */
    const ServerInteraction = (function () {
        const me = {};
 
        let successFunc = null,
            failureFunc = null,
            symmetricKey = null,
            url,
            data,
            password;
 
        /**
         * public variable ('constant') for errors to prevent magic numbers
         *
         * @name   ServerInteraction.error
         * @readonly
         * @enum   {Object}
         */
        me.error = {
            okay: 0,
            custom: 1,
            unknown: 2,
            serverError: 3
        };
 
        /**
         * ajaxHeaders to send in AJAX requests
         *
         * @name   ServerInteraction.ajaxHeaders
         * @private
         * @readonly
         * @enum   {Object}
         */
        const ajaxHeaders = {'X-Requested-With': 'JSONHttpRequest'};
 
        /**
         * called after successful upload
         *
         * @name   ServerInteraction.success
         * @private
         * @function
         * @param {int} status
         * @param {int} result - optional
         */
        function success(status, result)
        {
            if (successFunc !== null) {
                // add useful data to result
                result.encryptionKey = symmetricKey;
                successFunc(status, result);
            }
        }
 
        /**
         * called after a upload failure
         *
         * @name   ServerInteraction.fail
         * @private
         * @function
         * @param {int} status - internal code
         * @param {int} result - original error code
         */
        function fail(status, result)
        {
            if (failureFunc !== null) {
                failureFunc(status, result);
            }
        }
 
        /**
         * actually uploads the data
         *
         * @name   ServerInteraction.run
         * @function
         */
        me.run = function()
        {
            let isPost = Object.keys(data).length > 0,
                ajaxParams = {
                    type: isPost ? 'POST' : 'GET',
                    url: url,
                    headers: ajaxHeaders,
                    dataType: 'json',
                    success: function(result) {
                        if (result.status === 0) {
                            success(0, result);
                        } else if (result.status === 1) {
                            fail(1, result);
                        } else {
                            fail(2, result);
                        }
                    }
                };
            if (isPost) {
                ajaxParams.data = JSON.stringify(data);
            }
            $.ajax(ajaxParams).fail(function(jqXHR, textStatus, errorThrown) {
                console.error(textStatus, errorThrown);
                fail(3, jqXHR);
            });
        };
 
        /**
         * return currently set data, used in unit testing
         *
         * @name   ServerInteraction.getData
         * @function
         */
        me.getData = function()
        {
            return data;
        };
 
        /**
         * set success function
         *
         * @name   ServerInteraction.setUrl
         * @function
         * @param {function} newUrl
         */
        me.setUrl = function(newUrl)
        {
            url = newUrl;
        };
 
        /**
         * sets the password to use (first value) and optionally also the
         * encryption key (not recommended, it is automatically generated).
         *
         * Note: Call this after prepare() as prepare() resets these values.
         *
         * @name   ServerInteraction.setCryptValues
         * @function
         * @param {string} newPassword
         * @param {string} newKey       - optional
         */
        me.setCryptParameters = function(newPassword, newKey)
        {
            password = newPassword;
 
            Eif (typeof newKey !== 'undefined') {
                symmetricKey = newKey;
            }
        };
 
        /**
         * set success function
         *
         * @name   ServerInteraction.setSuccess
         * @function
         * @param {function} func
         */
        me.setSuccess = function(func)
        {
            successFunc = func;
        };
 
        /**
         * set failure function
         *
         * @name   ServerInteraction.setFailure
         * @function
         * @param {function} func
         */
        me.setFailure = function(func)
        {
            failureFunc = func;
        };
 
        /**
         * prepares a new upload
         *
         * Call this when doing a new upload to reset any data from potential
         * previous uploads. Must be called before any other method of this
         * module.
         *
         * @name   ServerInteraction.prepare
         * @function
         * @return {object}
         */
        me.prepare = function()
        {
            // entropy should already be checked!
 
            // reset password
            password = '';
 
            // reset key, so it a new one is generated when it is used
            symmetricKey = null;
 
            // reset data
            successFunc = null;
            failureFunc = null;
            url = Helper.baseUri();
            data = {};
        };
 
        /**
         * encrypts and sets the data
         *
         * @name   ServerInteraction.setCipherMessage
         * @async
         * @function
         * @param {object} cipherMessage
         */
        me.setCipherMessage = async function(cipherMessage)
        {
            Iif (
                symmetricKey === null ||
                (typeof symmetricKey === 'string' && symmetricKey === '')
            ) {
                symmetricKey = CryptTool.getSymmetricKey();
            }
            Iif (!data.hasOwnProperty('adata')) {
                data['adata'] = [];
            }
            let cipherResult = await CryptTool.cipher(symmetricKey, password, JSON.stringify(cipherMessage), data['adata']);
            data['v'] = 2;
            data['ct'] = cipherResult[0];
            data['adata'] = cipherResult[1];
 
        };
 
        /**
         * set the additional metadata to send unencrypted
         *
         * @name   ServerInteraction.setUnencryptedData
         * @function
         * @param {string} index
         * @param {mixed} element
         */
        me.setUnencryptedData = function(index, element)
        {
            data[index] = element;
        };
 
        /**
         * Helper, which parses shows a general error message based on the result of the ServerInteraction
         *
         * @name    ServerInteraction.parseUploadError
         * @function
         * @param {int} status
         * @param {object} data
         * @param {string} doThisThing - a human description of the action, which was tried
         * @return {array}
         */
        me.parseUploadError = function(status, data, doThisThing) {
            let errorArray;
 
            switch (status) {
                case me.error.custom:
                    errorArray = ['Could not ' + doThisThing + ': %s', data.message];
                    break;
                case me.error.unknown:
                    errorArray = ['Could not ' + doThisThing + ': %s', I18n._('unknown status')];
                    break;
                case me.error.serverError:
                    errorArray = ['Could not ' + doThisThing + ': %s', I18n._('server error or not responding')];
                    break;
                default:
                    errorArray = ['Could not ' + doThisThing + ': %s', I18n._('unknown error')];
                    break;
            }
 
            return errorArray;
        };
 
        return me;
    })();
 
    /**
     * (controller) Responsible for encrypting paste and sending it to server.
     *
     * Does upload, encryption is done transparently by ServerInteraction.
     *
     * @name PasteEncrypter
     * @class
     */
    const PasteEncrypter = (function () {
        const me = {};
 
        /**
         * called after successful paste upload
         *
         * @name PasteEncrypter.showCreatedPaste
         * @private
         * @function
         * @param {int} status
         * @param {object} data
         */
        function showCreatedPaste(status, data) {
            Alert.hideLoading();
            Alert.hideMessages();
 
            // show notification
            const baseUri   = Helper.baseUri() + '?',
                  url       = baseUri + data.id + (TopNav.getBurnAfterReading() ? loadConfirmPrefix : '#') + CryptTool.base58encode(data.encryptionKey),
                  deleteUrl = baseUri + 'pasteid=' + data.id + '&deletetoken=' + data.deletetoken;
            PasteStatus.createPasteNotification(url, deleteUrl);
 
            // show new URL in browser bar
            history.pushState({type: 'newpaste'}, document.title, url);
 
            TopNav.showViewButtons();
 
            // this cannot be grouped with showViewButtons due to remaining time calculation
            TopNav.showEmailButton();
 
            TopNav.hideRawButton();
            TopNav.hideDownloadButton();
            Editor.hide();
 
            // parse and show text
            // (preparation already done in me.sendPaste())
            PasteViewer.run();
        }
 
        /**
         * called after successful comment upload
         *
         * @name PasteEncrypter.showUploadedComment
         * @private
         * @function
         * @param {int} status
         * @param {object} data
         */
        function showUploadedComment(status, data) {
            // show success message
            Alert.showStatus('Comment posted.');
 
            // reload paste
            Controller.refreshPaste(function () {
                // highlight sent comment
                DiscussionViewer.highlightComment(data.id, true);
                // reset error handler
                Alert.setCustomHandler(null);
            });
        }
 
        /**
         * send a reply in a discussion
         *
         * @name   PasteEncrypter.sendComment
         * @async
         * @function
         */
        me.sendComment = async function()
        {
            Alert.hideMessages();
            Alert.setCustomHandler(DiscussionViewer.handleNotification);
 
            // UI loading state
            TopNav.hideAllButtons();
            Alert.showLoading('Sending comment…', 'cloud-upload');
 
            // get data
            const plainText = DiscussionViewer.getReplyMessage(),
                  nickname  = DiscussionViewer.getReplyNickname(),
                  parentid  = DiscussionViewer.getReplyCommentId();
 
            // do not send if there is no data
            if (plainText.length === 0) {
                // revert loading status…
                Alert.hideLoading();
                Alert.setCustomHandler(null);
                TopNav.showViewButtons();
                return;
            }
 
            // prepare server interaction
            ServerInteraction.prepare();
            ServerInteraction.setCryptParameters(Prompt.getPassword(), Model.getPasteKey());
 
            // set success/fail functions
            ServerInteraction.setSuccess(showUploadedComment);
            ServerInteraction.setFailure(function (status, data) {
                // revert loading status…
                Alert.hideLoading();
                TopNav.showViewButtons();
 
                // …show error message…
                Alert.showError(
                    ServerInteraction.parseUploadError(status, data, 'post comment')
                );
 
                // …and reset error handler
                Alert.setCustomHandler(null);
            });
 
            // fill it with unencrypted params
            ServerInteraction.setUnencryptedData('pasteid', Model.getPasteId());
            if (typeof parentid === 'undefined') {
                // if parent id is not set, this is the top-most comment, so use
                // paste id as parent, as the root element of the discussion tree
                ServerInteraction.setUnencryptedData('parentid', Model.getPasteId());
            } else {
                ServerInteraction.setUnencryptedData('parentid', parentid);
            }
 
            // prepare cypher message
            let cipherMessage = {
                'comment': plainText
            };
            if (nickname.length > 0) {
                cipherMessage['nickname'] = nickname;
            }
 
            await ServerInteraction.setCipherMessage(cipherMessage).catch(Alert.showError);
            ServerInteraction.run();
        };
 
        /**
         * sends a new paste to server
         *
         * @name   PasteEncrypter.sendPaste
         * @async
         * @function
         */
        me.sendPaste = async function()
        {
            // hide previous (error) messages
            Controller.hideStatusMessages();
 
            // UI loading state
            TopNav.hideAllButtons();
            Alert.showLoading('Sending paste…', 'cloud-upload');
            TopNav.collapseBar();
 
            // get data
            const plainText = Editor.getText(),
                  format    = PasteViewer.getFormat(),
                  // the methods may return different values if no files are attached (null, undefined or false)
                  files     = TopNav.getFileList() || AttachmentViewer.getFile() || AttachmentViewer.hasAttachment();
 
            // do not send if there is no data
            if (plainText.length === 0 && !files) {
                // revert loading status…
                Alert.hideLoading();
                TopNav.showCreateButtons();
                return;
            }
 
            // prepare server interaction
            ServerInteraction.prepare();
            ServerInteraction.setCryptParameters(TopNav.getPassword());
 
            // set success/fail functions
            ServerInteraction.setSuccess(showCreatedPaste);
            ServerInteraction.setFailure(function (status, data) {
                // revert loading status…
                Alert.hideLoading();
                TopNav.showCreateButtons();
 
                // show error message
                Alert.showError(
                    ServerInteraction.parseUploadError(status, data, 'create paste')
                );
            });
 
            // fill it with unencrypted submitted options
            ServerInteraction.setUnencryptedData('adata', [
                null, format,
                TopNav.getOpenDiscussion() ? 1 : 0,
                TopNav.getBurnAfterReading() ? 1 : 0
            ]);
            ServerInteraction.setUnencryptedData('meta', {'expire': TopNav.getExpiration()});
 
            // prepare PasteViewer for later preview
            PasteViewer.setText(plainText);
            PasteViewer.setFormat(format);
 
            // prepare cypher message
            let file = AttachmentViewer.getAttachmentData(),
                cipherMessage = {
                    'paste': plainText
                };
            if (typeof file !== 'undefined' && file !== null) {
                cipherMessage['attachment'] = file;
                cipherMessage['attachment_name'] = AttachmentViewer.getFile().name;
            } else if (AttachmentViewer.hasAttachment()) {
                // fall back to cloned part
                let attachment = AttachmentViewer.getAttachment();
                cipherMessage['attachment'] = attachment[0];
                cipherMessage['attachment_name'] = attachment[1];
 
                // we need to retrieve data from blob if browser already parsed it in memory
                if (typeof attachment[0] === 'string' && attachment[0].startsWith('blob:')) {
                    Alert.showStatus(
                        [
                            'Retrieving cloned file \'%s\' from memory...',
                            attachment[1]
                        ],
                        'copy'
                    );
                    try {
                        const blobData = await $.ajax({
                            type: 'GET',
                            url: `${attachment[0]}`,
                            processData: false,
                            timeout: 10000,
                            xhrFields: {
                                withCredentials: false,
                                responseType: 'blob'
                            }
                        });
                        if (blobData instanceof window.Blob) {
                            const fileReading = new Promise(function(resolve, reject) {
                                const fileReader = new FileReader();
                                fileReader.onload = function (event) {
                                    resolve(event.target.result);
                                };
                                fileReader.onerror = function (error) {
                                    reject(error);
                                }
                                fileReader.readAsDataURL(blobData);
                            });
                            cipherMessage['attachment'] = await fileReading;
                        } else {
                            const error = 'Cannot process attachment data.';
                            Alert.showError(error);
                            throw new TypeError(error);
                        }
                    } catch (error) {
                        console.error(error);
                        Alert.showError('Cannot retrieve attachment.');
                        throw error;
                    }
                }
            }
 
            // encrypt message
            await ServerInteraction.setCipherMessage(cipherMessage).catch(Alert.showError);
 
            // send data
            ServerInteraction.run();
        };
 
        return me;
    })();
 
    /**
     * (controller) Responsible for decrypting cipherdata and passing data to view.
     *
     * Only decryption, no download.
     *
     * @name PasteDecrypter
     * @class
     */
    const PasteDecrypter = (function () {
        const me = {};
 
        /**
         * decrypt data or prompts for password in case of failure
         *
         * @name   PasteDecrypter.decryptOrPromptPassword
         * @private
         * @async
         * @function
         * @param  {string} key
         * @param  {string} password - optional, may be an empty string
         * @param  {string} cipherdata
         * @throws {string}
         * @return {false|string} false, when unsuccessful or string (decrypted data)
         */
        async function decryptOrPromptPassword(key, password, cipherdata)
        {
            // try decryption without password
            const plaindata = await CryptTool.decipher(key, password, cipherdata);
 
            // if it fails, request password
            if (plaindata.length === 0 && password.length === 0) {
                // show prompt
                Prompt.requestPassword();
 
                // Thus, we cannot do anything yet, we need to wait for the user
                // input.
                return false;
            }
 
            // if all tries failed, we can only return an error
            if (plaindata.length === 0) {
                return false;
            }
 
            return plaindata;
        }
 
        /**
         * decrypt the actual paste text
         *
         * @name   PasteDecrypter.decryptPaste
         * @private
         * @async
         * @function
         * @param  {Paste} paste - paste data in object form
         * @param  {string} key
         * @param  {string} password
         * @throws {string}
         * @return {Promise}
         */
        async function decryptPaste(paste, key, password)
        {
            let pastePlain = await decryptOrPromptPassword(
                key, password,
                paste.getCipherData()
            );
            if (pastePlain === false) {
                if (password.length === 0) {
                    throw 'waiting on user to provide a password';
                } else {
                    Alert.hideLoading();
                    // reset password, so it can be re-entered
                    Prompt.reset();
                    TopNav.showRetryButton();
                    throw 'Could not decrypt data. Did you enter a wrong password? Retry with the button at the top.';
                }
            }
 
            if (paste.v > 1) {
                // version 2 paste
                const pasteMessage = JSON.parse(pastePlain);
                if (pasteMessage.hasOwnProperty('attachment') && pasteMessage.hasOwnProperty('attachment_name')) {
                    AttachmentViewer.setAttachment(pasteMessage.attachment, pasteMessage.attachment_name);
                    AttachmentViewer.showAttachment();
                }
                pastePlain = pasteMessage.paste;
            } else {
                // version 1 paste
                if (paste.hasOwnProperty('attachment') && paste.hasOwnProperty('attachmentname')) {
                    Promise.all([
                        CryptTool.decipher(key, password, paste.attachment),
                        CryptTool.decipher(key, password, paste.attachmentname)
                    ]).then((attachment) => {
                        AttachmentViewer.setAttachment(attachment[0], attachment[1]);
                        AttachmentViewer.showAttachment();
                    });
                }
            }
            PasteViewer.setFormat(paste.getFormat());
            PasteViewer.setText(pastePlain);
            PasteViewer.run();
        }
 
        /**
         * decrypts all comments and shows them
         *
         * @name   PasteDecrypter.decryptComments
         * @private
         * @async
         * @function
         * @param  {Paste} paste - paste data in object form
         * @param  {string} key
         * @param  {string} password
         * @return {Promise}
         */
        async function decryptComments(paste, key, password)
        {
            // remove potential previous discussion
            DiscussionViewer.prepareNewDiscussion();
 
            const commentDecryptionPromises = [];
            // iterate over comments
            for (let i = 0; i < paste.comments.length; ++i) {
                const comment        = new Comment(paste.comments[i]),
                      commentPromise = CryptTool.decipher(key, password, comment.getCipherData());
                paste.comments[i] = comment;
                if (comment.v > 1) {
                    // version 2 comment
                    commentDecryptionPromises.push(
                        commentPromise.then(function (commentJson) {
                            const commentMessage = JSON.parse(commentJson);
                            return [
                                commentMessage.comment  || '',
                                commentMessage.nickname || ''
                            ];
                        })
                    );
                } else {
                    // version 1 comment
                    commentDecryptionPromises.push(
                        Promise.all([
                            commentPromise,
                            paste.comments[i].meta.hasOwnProperty('nickname') ?
                                CryptTool.decipher(key, password, paste.comments[i].meta.nickname) :
                                Promise.resolve('')
                        ])
                    );
                }
            }
            return Promise.all(commentDecryptionPromises).then(function (plaintexts) {
                for (let i = 0; i < paste.comments.length; ++i) {
                    if (plaintexts[i][0].length === 0) {
                        continue;
                    }
                    DiscussionViewer.addComment(
                        paste.comments[i],
                        plaintexts[i][0],
                        plaintexts[i][1]
                    );
                }
            });
        }
 
        /**
         * show decrypted text in the display area, including discussion (if open)
         *
         * @name   PasteDecrypter.run
         * @function
         * @param  {Paste} [paste] - (optional) object including comments to display (items = array with keys ('data','meta'))
         */
        me.run = function(paste)
        {
            Alert.hideMessages();
            Alert.showLoading('Decrypting paste…', 'cloud-download');
 
            if (typeof paste === 'undefined' || paste.type === 'click') {
                // get cipher data and wait until it is available
                Model.getPasteData(me.run);
                return;
            }
 
            let key = Model.getPasteKey(),
                password = Prompt.getPassword(),
                decryptionPromises = [];
 
            TopNav.setRetryCallback(function () {
                TopNav.hideRetryButton();
                me.run(paste);
            });
 
            // decrypt paste & attachments
            decryptionPromises.push(decryptPaste(paste, key, password));
 
            // if the discussion is opened on this paste, display it
            if (paste.isDiscussionEnabled()) {
                decryptionPromises.push(decryptComments(paste, key, password));
            }
 
            // shows the remaining time (until) deletion
            PasteStatus.showRemainingTime(paste);
 
            Promise.all(decryptionPromises)
                .then(() => {
                    Alert.hideLoading();
                    TopNav.showViewButtons();
 
                    // discourage cloning (it cannot really be prevented)
                    if (paste.isBurnAfterReadingEnabled()) {
                        TopNav.hideBurnAfterReadingButtons();
                    } else {
                        // we have to pass in remaining_time here
                        TopNav.showEmailButton(paste.getTimeToLive());
                    }
 
                    // only offer adding comments, after paste was successfully decrypted
                    if (paste.isDiscussionEnabled()) {
                        DiscussionViewer.finishDiscussion();
                    }
 
                })
                .catch((err) => {
                    // wait for the user to type in the password,
                    // then PasteDecrypter.run will be called again
                    Alert.showError(err);
                });
        };
 
        return me;
    })();
 
    /**
     * (controller) main PrivateBin logic
     *
     * @name   Controller
     * @param  {object} window
     * @param  {object} document
     * @class
     */
    const Controller = (function (window, document) {
        const me = {};
 
        /**
         * hides all status messages no matter which module showed them
         *
         * @name   Controller.hideStatusMessages
         * @function
         */
        me.hideStatusMessages = function()
        {
            PasteStatus.hideMessages();
            Alert.hideMessages();
        };
 
        /**
         * creates a new paste
         *
         * @name   Controller.newPaste
         * @function
         */
        me.newPaste = function()
        {
            // Important: This *must not* run Alert.hideMessages() as previous
            // errors from viewing a paste should be shown.
            TopNav.hideAllButtons();
            Alert.showLoading('Preparing new paste…', 'time');
 
            PasteStatus.hideMessages();
            PasteViewer.hide();
            Editor.resetInput();
            Editor.show();
            Editor.focusInput();
            AttachmentViewer.removeAttachment();
            TopNav.resetInput();
 
            TopNav.showCreateButtons();
 
            // newPaste could be called when user is on paste clone editing view
            TopNav.hideCustomAttachment();
            AttachmentViewer.clearDragAndDrop();
            AttachmentViewer.removeAttachmentData();
 
            Alert.hideLoading();
            // only push new state if we are coming from a different one
            if (Helper.baseUri() != window.location) {
                history.pushState({type: 'create'}, document.title, Helper.baseUri());
            }
 
            // clear discussion
            DiscussionViewer.prepareNewDiscussion();
        };
 
        /**
         * shows the loaded paste
         *
         * @name   Controller.showPaste
         * @function
         */
        me.showPaste = function()
        {
            try {
                Model.getPasteKey();
            } catch (err) {
                console.error(err);
 
                // missing decryption key (or paste ID) in URL?
                if (window.location.hash.length === 0) {
                    Alert.showError('Cannot decrypt paste: Decryption key missing in URL (Did you use a redirector or an URL shortener which strips part of the URL?)');
                    return;
                }
            }
 
            // check if we should request loading confirmation
            if(window.location.hash.startsWith(loadConfirmPrefix)) {
                Prompt.requestLoadConfirmation();
                return;
            }
 
            // show proper elements on screen
            PasteDecrypter.run();
        };
 
        /**
         * refreshes the loaded paste to show potential new data
         *
         * @name   Controller.refreshPaste
         * @function
         * @param  {function} callback
         */
        me.refreshPaste = function(callback)
        {
            // save window position to restore it later
            const orgPosition = $(window).scrollTop();
 
            Model.getPasteData(function (data) {
                ServerInteraction.prepare();
                ServerInteraction.setUrl(Helper.baseUri() + '?pasteid=' + Model.getPasteId());
 
                ServerInteraction.setFailure(function (status, data) {
                    // revert loading status…
                    Alert.hideLoading();
                    TopNav.showViewButtons();
 
                    // show error message
                    Alert.showError(
                        ServerInteraction.parseUploadError(status, data, 'refresh display')
                    );
                });
                ServerInteraction.setSuccess(function (status, data) {
                    PasteDecrypter.run(new Paste(data));
 
                    // restore position
                    window.scrollTo(0, orgPosition);
 
                    // NOTE: could create problems as callback may be called
                    // asyncronously if PasteDecrypter e.g. needs to wait for a
                    // password being entered
                    callback();
                });
                ServerInteraction.run();
            }, false); // this false is important as it circumvents the cache
        }
 
        /**
         * clone the current paste
         *
         * @name   Controller.clonePaste
         * @function
         */
        me.clonePaste = function()
        {
            TopNav.collapseBar();
            TopNav.hideAllButtons();
 
            // hide messages from previous paste
            me.hideStatusMessages();
 
            // erase the id and the key in url
            history.pushState({type: 'clone'}, document.title, Helper.baseUri());
 
            if (AttachmentViewer.hasAttachment()) {
                AttachmentViewer.moveAttachmentTo(
                    TopNav.getCustomAttachment(),
                    'Cloned: \'%s\''
                );
                TopNav.hideFileSelector();
                AttachmentViewer.hideAttachment();
                // NOTE: it also looks nice without removing the attachment
                // but for a consistent display we remove it…
                AttachmentViewer.hideAttachmentPreview();
                TopNav.showCustomAttachment();
 
                // show another status message to make the user aware that the
                // file was cloned too!
                Alert.showStatus(
                    [
                        'The cloned file \'%s\' was attached to this paste.',
                        AttachmentViewer.getAttachment()[1]
                    ],
                    'copy'
                );
            }
 
            Editor.setText(PasteViewer.getText());
            // also clone the format
            TopNav.setFormat(PasteViewer.getFormat());
            PasteViewer.hide();
            Editor.show();
 
            TopNav.showCreateButtons();
 
            // clear discussion
            DiscussionViewer.prepareNewDiscussion();
        };
 
        /**
         * try initializing zlib or display a warning if it fails,
         * extracted from main init to allow unit testing
         *
         * @name   Controller.initZ
         * @function
         */
        me.initZ = function()
        {
            z = zlib.catch(function () {
                Eif ($('body').data('compression') !== 'none') {
                    Alert.showWarning('Your browser doesn\'t support WebAssembly, used for zlib compression. You can create uncompressed documents, but can\'t read compressed ones.');
                }
            });
        }
 
        /**
         * application start
         *
         * @name   Controller.init
         * @function
         */
        me.init = function()
        {
            // first load translations
            I18n.loadTranslations();
 
            // Add a hook to make all links open a new window
            DOMPurify.addHook('afterSanitizeAttributes', function(node) {
                // set all elements owning target to target=_blank
                if ('target' in node && node.id !== 'pasteurl') {
                    node.setAttribute('target', '_blank');
                }
                // set non-HTML/MathML links to xlink:show=new
                if (!node.hasAttribute('target')
                    && (node.hasAttribute('xlink:href')
                        || node.hasAttribute('href'))) {
                    node.setAttribute('xlink:show', 'new');
                }
                if ('rel' in node) {
                    node.setAttribute('rel', 'nofollow noopener noreferrer');
                }
            });
 
            // center all modals
            $('.modal').on('show.bs.modal', function(e) {
                $(e.target).css({
                    display: 'flex'
                });
            });
 
            // initialize other modules/"classes"
            Alert.init();
            Model.init();
            AttachmentViewer.init();
            DiscussionViewer.init();
            Editor.init();
            PasteStatus.init();
            PasteViewer.init();
            Prompt.init();
            TopNav.init();
            UiHelper.init();
 
            // check for legacy browsers before going any further
            Iif (!Legacy.Check.getInit()) {
                // Legacy check didn't complete, wait and try again
                setTimeout(init, 500);
                return;
            }
            Eif (!Legacy.Check.getStatus()) {
                // something major is wrong, stop right away
                return;
            }
            me.initZ();
 
            // if delete token is passed (i.e. paste has been deleted by this
            // access), there is nothing more to do
            if (Model.hasDeleteToken()) {
                return;
            }
 
            // check whether existing paste needs to be shown
            try {
                Model.getPasteId();
            } catch (e) {
                // otherwise create a new paste
                return me.newPaste();
            }
 
            // always reload on back button to invalidate cache(protect burn after read paste)
            window.addEventListener('popstate', () => {
                window.location.reload();
            });
 
            // display an existing paste
            return me.showPaste();
        }
 
        return me;
    })(window, document);
 
    return {
        Helper: Helper,
        I18n: I18n,
        CryptTool: CryptTool,
        Model: Model,
        UiHelper: UiHelper,
        Alert: Alert,
        PasteStatus: PasteStatus,
        Prompt: Prompt,
        Editor: Editor,
        PasteViewer: PasteViewer,
        AttachmentViewer: AttachmentViewer,
        DiscussionViewer: DiscussionViewer,
        TopNav: TopNav,
        ServerInteraction: ServerInteraction,
        PasteEncrypter: PasteEncrypter,
        PasteDecrypter: PasteDecrypter,
        Controller: Controller
    };
})(jQuery, RawDeflate);