/*
* 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.ws.extensions.security.element;

import java.security.PublicKey;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.signature.XMLSignature;
import org.jboss.logging.Logger;
import org.jboss.ws.extensions.security.KeyResolver;
import org.jboss.ws.extensions.security.WSSecurityException;
import org.w3c.dom.Element;


/**
 * @author Jason T. Greene
 * @version $Id: Signature.java 8760 2008-11-19 11:27:38Z darran.lofthouse@jboss.com $
 */
public class Signature implements SecurityProcess
{
   private static Logger log = Logger.getLogger(Signature.class);
   private XMLSignature signature;

   /* Used only for decoding */
   private PublicKey publicKey;
   /* Used only for jaas authentication */
   private BinarySecurityToken securityToken;

   private Element cachedElement;

   public Signature(XMLSignature signature)
   {
      this.signature = signature;
   }

   public Signature(Element element, KeyResolver resolver) throws WSSecurityException
   {
      try
      {
         signature = new XMLSignature(element, null);
         publicKey = resolver.resolvePublicKey(signature.getKeyInfo());
         try
         {
            securityToken = resolver.resolve(signature.getKeyInfo());
         }
         catch (Exception e)
         {
            //log exception and ignore, KeyInfo might not reference a security token
            log.debug("KeyInfo does not contain any reference to a binary security token.", e);
         }
      }
      catch (XMLSecurityException e)
      {
         throw new WSSecurityException("Error decoding xml signature: " + e.getMessage(), e);
      }
   }

   public XMLSignature getSignature()
   {
      return signature;
   }

   public void setSignature(XMLSignature signature)
   {
      this.signature = signature;
   }

   public Element getElement()
   {
      if (cachedElement != null)
         return cachedElement;

      cachedElement = signature.getElement();
      return cachedElement;
   }

   public PublicKey getPublicKey()
   {
      return publicKey;
   }
   
   public BinarySecurityToken getSecurityToken()
   {
      return securityToken;
   }
}