UpgradeController.php

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<?php

namespace Elgg\Upgrade;

use Elgg\Exceptions\Http\InternalServerErrorException;
use Elgg\Http\ResponseBuilder;
use Elgg\Request;
use Elgg\Traits\Loggable;
use Psr\Log\LogLevel;

class UpgradeController {

    use Loggable;

    public function __invoke(Request $request): ?ResponseBuilder {
        $response = null;

        $forward_url = $request->getParam('forward', 'admin');
        $forward_url = elgg_normalize_site_url($forward_url);

        $upgrade = _elgg_services()->upgrades->run();

        $upgrade->then(
            function () use (&$response, $forward_url) {
                $response = elgg_ok_response('', elgg_echo('upgrade:core'), $forward_url);
            },
            function ($error) use ($forward_url) {
                $this->log(LogLevel::ERROR, $error);

                $exception = new InternalServerErrorException($error);
                $exception->setRedirectUrl($forward_url);

                throw $exception;
            }
        );
        
        _elgg_services()->plugins->generateEntities();

        return $response;
    }
}