import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchResult;
/**
 * The class GetRole search with ldap for the users domain roles and returns
 * them.
 * @author Orientation in Objects GmbH
 */
public class GetRole {

	private NamingEnumeration role = null;

	/**
	 * The Method scanRole search with ldap for the users domain roles
	 * @param userName userPrincipalName of the loginuser
	 */
	public void scanRole(String userName) {
	
		String principal = "yourPrincipal";
		String credentials = "yourCredential";
	
		Hashtable env = new Hashtable(11);
		env.put(
			Context.INITIAL_CONTEXT_FACTORY,
			"com.sun.jndi.ldap.LdapCtxFactory");
		env.put(
			Context.PROVIDER_URL,
			"ldap://yourServer:yourPort/yourDomain");
	
		env.put(Context.SECURITY_PRINCIPAL, principal);
		env.put(Context.SECURITY_CREDENTIALS, credentials);
	
		try {
	
			// Erstellt eine Initial Directory Context
			DirContext ctx = new InitialDirContext(env);
			Attributes attr = new BasicAttributes("userPrincipalName", userName);
			NamingEnumeration userData = ctx.search("cn=Users", attr);
	
			while (userData.hasMoreElements()) {
				SearchResult sr = (SearchResult) userData.next();
				sr.getAttributes();
				Attributes userAttributes = sr.getAttributes();
				Attribute at = userAttributes.get("memberOf");
	
				if (at != null) {
					role = at.getAll();
				} else {
					role = null;
				}
	
			}
	
		} catch (NamingException e) {
			e.printStackTrace();
			role = null;
	
		}
	}

	
	/**
	 * Returns the domain roles of an user as NamingEnumeration
	 * @return the domain roles of an user as NamingEnumeration 
	 */
	public NamingEnumeration getRoleAsEnumeration() {

		return role;

	}

}