loadext.php

См. документацию.

<?
namespace Bitrix\Main\Controller;
 
use Bitrix\Main\Engine;
use Bitrix\Main\Engine\ActionFilter\Authentication;
use Bitrix\Main\Engine\ActionFilter\CloseSession;
use Bitrix\Main\UI\Extension;

class LoadExt extends Engine\Controller
{
    public function configureActions()
    {
        return [
            'getExtensions' => [
                '+prefilters' => [
                    new CloseSession()
                ],
                '-prefilters' => [
                    Authentication::class
                ]
            ]
        ];
    }

    public function getExtensionsAction($extension = [])
    {
        $result = [];
 
        if (!empty($extension) && is_array($extension))
        {
            foreach ($extension as $key => $item)
            {
                $result[] = [
                    'extension' => $item,
                    'config' => Extension::getBundleConfig($item),
                    'html' => Extension::getHtml($item),
                ];
            }
        }
 
        return $result;
    }
}