public function deliverPostFile()
 {
     global $ilUser;
     $id = (int) $_GET["object_id"];
     if (!$id) {
         return;
     }
     include_once 'Modules/BookingManager/classes/class.ilBookingReservation.php';
     $book_id = ilBookingReservation::getObjectReservationForUser($id, $ilUser->getId());
     $obj = new ilBookingReservation($book_id);
     if ($obj->getUserId() != $ilUser->getId()) {
         return;
     }
     include_once 'Modules/BookingManager/classes/class.ilBookingObject.php';
     $obj = new ilBookingObject($id);
     $file = $obj->getPostFileFullPath();
     if ($file) {
         ilUtil::deliverFile($file, $obj->getPostFile());
     }
 }