/**
* Retrieve the current identity, if any.
*
* If none is present, returns null.
*
* @return mixed|null
* @throws RuntimeException
*/
public function __invoke()
{
if (!$this->authenticationService instanceof AuthenticationServiceInterface) {
throw new RuntimeException('No AuthenticationService instance provided');
}
if (!$this->authenticationService->hasIdentity()) {
return null;
}
return $this->authenticationService->getIdentity();
}
