UpgradeGatekeeper.php

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<?php

namespace Elgg\Router\Middleware;

use Elgg\Http\ResponseBuilder;
use Elgg\Exceptions\Http\Gatekeeper\UpgradeGatekeeperException;

class UpgradeGatekeeper {

    public function __invoke(\Elgg\Request $request) {

        if (elgg_is_admin_logged_in()) {
            return null;
        }

        if (!_elgg_services()->config->security_protect_upgrade) {
            return null;
        }

        $url = $request->getURL();
        if (!_elgg_services()->urlSigner->isValid($url)) {
            throw new UpgradeGatekeeperException();
        }
    }
}