static public function isAuthor($request)
    {
        if (! User_Precondition::isLogedIn($request)){
            return false;
        }
        if ($request->user->hasPerm('tenant.owner') || //
        $request->user->hasPerm('cms.editor') || //
        $request->user->hasPerm('cms.author')) {
            return true;
        }
        return false;
    }