/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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 org.kuali.rice.ksb.security;

 import java.security.Signature;

 import java.security.cert.Certificate;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.lang.StringUtils;

 import org.kuali.rice.ksb.util.KSBConstants;

 /**

  * A DigitalSinger which places the alias and digital signature into the response headers of an HttpServletResponse.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class ResponseHeaderDigitalSigner extends AbstractDigitalSigner {

         private String alias;

         private Certificate certificate;

         private HttpServletResponse response;

     public ResponseHeaderDigitalSigner(Signature signature, String alias, HttpServletResponse response) {

         super(signature);

         this.alias = alias;

         this.response = response;

     }

     public ResponseHeaderDigitalSigner(Signature signature, String alias, Certificate certificate, HttpServletResponse response) {

         this(signature, alias, response);

         this.certificate = certificate;

     }

     public ResponseHeaderDigitalSigner(Signature signature, Certificate certificate, HttpServletResponse response) {

         super(signature);

         this.certificate = certificate;

         this.response = response;

     }

         public void sign() throws Exception {

             if (StringUtils.isNotBlank(this.alias) ) {

                 this.response.setHeader(KSBConstants.KEYSTORE_ALIAS_HEADER, this.alias);

             }

             if (this.certificate != null) {

                 this.response.setHeader(KSBConstants.KEYSTORE_CERTIFICATE_HEADER, getEncodedCertificate(this.certificate));

             }

             this.response.setHeader(KSBConstants.DIGITAL_SIGNATURE_HEADER, getEncodedSignature());

         }

 }