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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.security.auth.certs;

import java.security.Principal;
import java.security.cert.X509Certificate;

import javax.naming.InvalidNameException;
import javax.naming.ldap.LdapName;
import javax.naming.ldap.Rdn;

import org.jboss.security.CertificatePrincipal;
import org.jboss.security.SimplePrincipal;

/** A CertificatePrincipal implementation that uses the client cert
 * SubjectDN CN='...' element as the principal.
 * 
 * @author [email protected]
 * @author [email protected] 
 * @version $Revision$
 */
public class SubjectCNMapping
   implements CertificatePrincipal
{
   /** Returns the client cert common name portion (cn=...) of the SubjectDN
    * as the principal.
    *
    * @param certs Array of client certificates, with the first one in
    * the array being the certificate of the client itself.
    */
   public Principal toPrincipal(X509Certificate[] certs)
   {
      Principal cn = null;
      LdapName dn = null;

      Principal subject = certs[0].getSubjectDN();

      try {
         dn = new LdapName(subject.getName());
         for(Rdn rdn : dn.getRdns()) {
             if( rdn.getType().compareToIgnoreCase("cn") == 0 ) {
                 cn = new SimplePrincipal(rdn.getValue().toString());
             }	
	  }
      } catch (InvalidNameException e) {
      // Hope we never get inside
      }
      
      if( cn == null )
      {
         // Fallback to the DN
         cn = subject;
      }
      return cn;
   }
   
   public Principal toPrinicipal(X509Certificate[] certs)
   {
      return toPrincipal(certs);
   }
}