UNIT3D-Community-Edition/app/Http/Middleware/HtmlEncrypt.php

<?php
/**
 * NOTICE OF LICENSE
 *
 * UNIT3D is open-sourced software licensed under the GNU General Public License v3.0
 * The details is bundled with this project in the file LICENSE.txt.
 *
 * @project    UNIT3D
 * @license    https://choosealicense.com/licenses/gpl-3.0/  GNU General Public License v3.0
 * @author     HDVinnie
 */
 
namespace App\Http\Middleware;

use Closure;

class HtmlEncrypt
{
    private $hex;

    /**
     * HtmlEncrypt constructor.
     */
    public function __construct()
    {
        $this->hex = '';
    }

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        /**
         * @var $response Response
         */
        $response = $next($request);

        if ($request->isMethod('get') && !$request->ajax()) {
            $contentType = $response->headers->get('Content-Type');

            if (strpos($contentType, 'text/html') !== false) {
                $response->setContent($this->encryptHtml($response->getContent()));
            }
        }

        return $response;

    }

    public function encryptHtml($content)
    {
        $text = str_split(bin2hex($content), 2);

        array_walk($text, function (&$a) {
            $this->addHexValue('%' . $a);
        });

        $script = '<script type="text/javascript">document.writeln(unescape("' . $this->hex . '"));</script>';

        if (config('html-encrypt.disable_right_click')) {
            $script .= '<script>var body = document.getElementsByTagName("body")[0];var att = document.createAttribute("oncontextmenu");att.value = "return false";body.setAttributeNode(att);</script>';
        }

        if (config('html-encrypt.disable_ctrl_and_F12_key')) {
            $script .= '<script>document.onkeydown=function(e){if(e.ctrlKey || e.keyCode == 123){return false}}</script>';
        }

        return $script;
    }

    public function addHexValue($hex)
    {
        $this->hex .= $hex;
    }
}