public function setEntityAttachmentPrivacy(Entity $entity, $new_private = true, $options = [])
{
//check that the entity privacy can be changed
if ($entity->allowsPrivacyChange()) {
$f = $entity->getAttachmentDescription();
$new_f = $this->changeUploadedFilePrivacy($f, $new_private);
//$new_f is almost certainly the same as $f, but maybe the key or iv have changed
//in this very rare case, we may need to modify the entity
$entity->attachFile($new_f);
} else {
//throw an error
}
return $entity;
}
