/*
 * 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.XMLX509SubjectName;
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;


/**
 *
 * @author $Author: mullan $
 */
public class X509SubjectNameResolver extends KeyResolverSpi {

   /** {@link java.util.logging} logging facility */
    static java.util.logging.Logger log =
        java.util.logging.Logger.getLogger(
                    X509SubjectNameResolver.class.getName());


   /**
    * Method engineResolvePublicKey
    *
    * @param element
    * @param BaseURI
    * @param storage
    * @return null if no {@link PublicKey} could be obtained
    * @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 {
           if (log.isLoggable(java.util.logging.Level.FINE))
                log.log(java.util.logging.Level.FINE, "Can I resolve " + element.getTagName() + "?");
           Element[] x509childNodes = null;
           XMLX509SubjectName x509childObject[] = null;

           if (!XMLUtils.elementIsInSignatureSpace(element,
                         Constants._TAG_X509DATA) ) {
                        log.log(java.util.logging.Level.FINE, "I can't");
                 return null;
           }
       x509childNodes = XMLUtils.selectDsNodes(element.getFirstChild(),
                 Constants._TAG_X509SUBJECTNAME);

        if (!((x509childNodes != null)
                && (x509childNodes.length > 0))) {
                    log.log(java.util.logging.Level.FINE, "I can't");
                    return null;
            }

      try {
         if (storage == null) {
            Object exArgs[] = { Constants._TAG_X509SUBJECTNAME };
            KeyResolverException ex =
               new KeyResolverException("KeyResolver.needStorageResolver",
                                        exArgs);

            log.log(java.util.logging.Level.INFO, "", ex);

            throw ex;
         }

         x509childObject =
            new XMLX509SubjectName[x509childNodes.length];

         for (int i = 0; i < x509childNodes.length; i++) {
            x509childObject[i] =
               new XMLX509SubjectName(x509childNodes[i],
                                      BaseURI);
         }

         while (storage.hasNext()) {
            X509Certificate cert = storage.next();
            XMLX509SubjectName certSN =
               new XMLX509SubjectName(element.getOwnerDocument(), cert);

            log.log(java.util.logging.Level.FINE, "Found Certificate SN: " + certSN.getSubjectName());

            for (int i = 0; i < x509childObject.length; i++) {
               log.log(java.util.logging.Level.FINE, "Found Element SN:     "
                         + x509childObject[i].getSubjectName());

               if (certSN.equals(x509childObject[i])) {
                  log.log(java.util.logging.Level.FINE, "match !!! ");

                  return cert;
               }
               log.log(java.util.logging.Level.FINE, "no match...");
            }
         }

         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;
   }
}