@Override
@SuppressWarnings("unchecked")
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
// retrieve user information
SimplePrincipalCollection principalCollection = (SimplePrincipalCollection) principals;
List<Object> listPrincipals = principalCollection.asList();
Map<String, String> attributes = (Map<String, String>) listPrincipals.get(1);
// create simple authorization info
SimpleAuthorizationInfo simpleAuthorizationInfo = new SimpleAuthorizationInfo();
// add default roles
addRoles(simpleAuthorizationInfo, split(defaultRoles));