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 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright  1999-2004 The Apache Software Foundation.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package com.sun.org.apache.xml.internal.security.keys.keyresolver.implementations;



import java.security.PublicKey;
import java.security.cert.X509Certificate;


import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.keys.content.x509.XMLX509Certificate;
import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverException;
import com.sun.org.apache.xml.internal.security.keys.keyresolver.KeyResolverSpi;
import com.sun.org.apache.xml.internal.security.keys.storage.StorageResolver;
import com.sun.org.apache.xml.internal.security.utils.Constants;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.Element;


/**
 * Resolves Certificates which are directly contained inside a
 * <CODE>ds:X509Certificate</CODE> Element.
 *
 * @author $Author: mullan $
 */
public class X509CertificateResolver extends KeyResolverSpi {

   /** {@link java.util.logging} logging facility */
    static java.util.logging.Logger log =
        java.util.logging.Logger.getLogger(X509CertificateResolver.class.getName());



   /**
    * Method engineResolvePublicKey
    * @inheritDoc
    * @param element
    * @param BaseURI
    * @param storage
    *
    * @throws KeyResolverException
    */
   public PublicKey engineLookupAndResolvePublicKey(
           Element element, String BaseURI, StorageResolver storage)
              throws KeyResolverException {

      X509Certificate cert = this.engineLookupResolveX509Certificate(element,
                                BaseURI, storage);

      if (cert != null) {
         return cert.getPublicKey();
      }

      return null;
   }

   /**
    * Method engineResolveX509Certificate
    * @inheritDoc
    * @param element
    * @param BaseURI
    * @param storage
    *
    * @throws KeyResolverException
    */
   public X509Certificate engineLookupResolveX509Certificate(
           Element element, String BaseURI, StorageResolver storage)
              throws KeyResolverException {

      try {
          Element[] els=XMLUtils.selectDsNodes(element.getFirstChild(),
                  Constants._TAG_X509CERTIFICATE);
         if ((els == null) || (els.length == 0)) {
                 Element el=XMLUtils.selectDsNode(element.getFirstChild(),
                     Constants._TAG_X509DATA,0);
             if (el!=null) {
                 return engineLookupResolveX509Certificate(el, BaseURI, storage);
             }
                 return null;
         }

         // populate Object array
         for (int i = 0; i < els.length; i++) {
                 XMLX509Certificate xmlCert=new XMLX509Certificate(els[i], BaseURI);
                 X509Certificate cert = xmlCert.getX509Certificate();
            if (cert!=null) {
                return cert;
            }
         }
         return null;
      } catch (XMLSecurityException ex) {
         log.log(java.util.logging.Level.FINE, "XMLSecurityException", ex);

         throw new KeyResolverException("generic.EmptyMessage", ex);
      }
   }

   /**
    * Method engineResolveSecretKey
    * @inheritDoc
    * @param element
    * @param BaseURI
    * @param storage
    *
    */
   public javax.crypto.SecretKey engineLookupAndResolveSecretKey(
           Element element, String BaseURI, StorageResolver storage)
   {
      return null;
   }
}