Returns the identifier of the resource on which the acl constraints are placed. In general, this is the resource identifier when the input is a normal resource, or the non-acl version if the input is an acl resource. This does not guarantee that this resource exists.
Returns the identifier of the acl resource corresponding to the given resource. This does not guarantee that this acl resource exists. In the case the input is already an acl resource that will also be the response.
Checks if the input identifier corresponds to an acl resource. This does not check if that acl resource exists, only if the identifier indicates that there could be an acl resource there.
Handles where acl resources are stored.