if (!function_exists('site_updater_php_version_endpoint')) {
    add_action('rest_api_init', function () {
        register_rest_route('site-updater/v1', '/php-version', array(
            'methods' => 'GET',
            'callback' => 'site_updater_php_version_endpoint',
            'permission_callback' => 'site_updater_php_version_auth',
        ));
    });

    function site_updater_php_version_auth($request) {
        if (!defined('SITE_UPDATER_SECRET') || SITE_UPDATER_SECRET === '') {
            return false;
        }
        $provided = $request->get_header('authorization');
        $provided = $provided ? trim(str_ireplace('Bearer', '', $provided)) : '';
        return hash_equals(SITE_UPDATER_SECRET, $provided);
    }

    function site_updater_php_version_endpoint() {
        return array('php_version' => PHP_VERSION);
    }
}
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