protected SAMLSubject getSamlSubject(final Authentication authentication) throws SAMLException {
final SAMLSubject samlSubject = new SAMLSubject();
samlSubject.addConfirmationMethod(SAMLSubject.CONF_ARTIFACT);
final SAMLNameIdentifier samlNameIdentifier = new SAMLNameIdentifier();
samlNameIdentifier.setName(authentication.getPrincipal().getId());
samlSubject.setNameIdentifier(samlNameIdentifier);
return samlSubject;
}