NEOS CMS E-Mail obfuscation fusion implentation

EmailObfuscationImplementation.php

<?php
namespace My\Package\Fusion;

class EmailObfuscationImplementation extends \Neos\Fusion\FusionObjects\DataStructureImplementation
{

    const MAILTO_REGEX = '/<a(.*?)href="mailto:(.+?)"(.*?)>(.*?)<\/a>/i';

    /**
     * Get the glue to insert between items
     *
     * @return string
     */
    public function getValue()
    {
        return $this->fusionValue('value') ?? '';
    }

    /**
     * Get the glue to insert between items
     *
     * @return string
     */
    public function getRot13Encrypter()
    {
        return function($hit) {
            list(
                $wholeString,
                $tagContentBeforeHref,
                $mailtoEmail,
                $tagContentAfterHref,
                $linkContent
                ) = $hit;

            if (filter_var($linkContent, FILTER_VALIDATE_EMAIL)) {
                $emailLength = strlen($linkContent);
                $atPos = strpos($linkContent, '@') + 1;
                $linkContent = substr($hit[4], 0, $atPos);
                $linkContent.= '<span class="d-none" aria-hidden="true">no-bots</span>';
                $linkContent.= substr($hit[4], $atPos, $emailLength);
            }

            return sprintf(
                '<a%shref="mailto:%s"%s>%s</a>',
                $tagContentBeforeHref,
                str_rot13($mailtoEmail),
                $tagContentAfterHref,
                $linkContent
            );
        };
    }

    /**
     * {@inheritdoc}
     *
     * @return string
     */
    public function evaluate()
    {
        return preg_replace_callback(
            self::MAILTO_REGEX,
            $this->getRot13Encrypter(),
            $this->getValue()
        );
    }
}

EmailObfusication.fusion

prototype(My.Package:Helper.EmailObfusication) {
    @class = "Wysiwyg\\OGE\\CorporateSite\\Fusion\\EmailObfuscationImplementation"
    value = ${value}
}

EmailObfusication.js

String.prototype.rot13 = function () {
    return this.replace(/[a-zA-Z]/g, function(a){
        return String.fromCharCode(((a=a.charCodeAt())<91?78:110)>a?a+13:a-13);
    });
};

$(document).ready(function(){
    $('body').on('click', '[href^="mailto:"]:not(.email-obf__decoded)', function(){
        let mailtoHref = $(this).attr('href');
        let rotEmail = mailtoHref.substring('mailto:'.length);

        $(this).attr('href', 'mailto:' + rotEmail.rot13()).addClass('email-obf__decoded');
    });
});