/**

  * 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.httpinvoker;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import org.apache.commons.codec.binary.Base64;

 import org.apache.commons.httpclient.HttpClient;

 import org.apache.commons.httpclient.methods.PostMethod;

 import org.kuali.rice.core.api.security.credentials.CredentialsSource;

 import org.kuali.rice.ksb.api.bus.ServiceConfiguration;

 import org.kuali.rice.ksb.messaging.KSBHttpInvokerRequestExecutor;

 import org.kuali.rice.ksb.security.credentials.UsernamePasswordCredentials;

 import org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration;

 import org.springframework.util.Assert;

 /**

  * Extension to {@link KSBHttpInvokerRequestExecutor} that retrieves

  * credentials from the CredentialsSource and places them in a BASIC HTTP

  * Authorization header.

  * 

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

  * @since 0.9

  */

 public final class AuthenticationCommonsHttpInvokerRequestExecutor extends

     KSBHttpInvokerRequestExecutor {

     /**

      * Source of the credentials to pass via BASIC AUTH.

      */

     private final CredentialsSource credentialsSource;

     /**

      * Details about the service that the CredentialsSource may need.

      */

     private final ServiceConfiguration serviceConfiguration;

     /**

      * Constructor that accepts the CredentialsSource and Service Info.

      * 

      * @param credentialsSource the source of credentials.

      * @param serviceInfo information about the service.

      */

     public AuthenticationCommonsHttpInvokerRequestExecutor(final HttpClient httpClient, 

         final CredentialsSource credentialsSource, final ServiceConfiguration serviceConfiguration) {

         super(httpClient);

         Assert.notNull(credentialsSource, "credentialsSource cannot be null.");

         Assert.notNull(serviceConfiguration, "serviceConfiguration cannot be null.");

         this.credentialsSource = credentialsSource;

         this.serviceConfiguration = serviceConfiguration;

     }

     /**

      * Overridden to obtain the Credentials from the CredentialsSource and pass

      * them via HTTP BASIC Authorization.

      */

     protected void setRequestBody(final HttpInvokerClientConfiguration config,

         final PostMethod postMethod, final ByteArrayOutputStream baos) throws IOException {

             final UsernamePasswordCredentials credentials = (UsernamePasswordCredentials) this.credentialsSource.getCredentials(this.serviceConfiguration.getEndpointUrl().toExternalForm());

         final String base64 = credentials.getUsername() + ":"

         + credentials.getPassword();

         postMethod.addRequestHeader("Authorization", "Basic " + new String(Base64.encodeBase64(base64.getBytes())));

         if (logger.isDebugEnabled()) {

             logger

                 .debug("HttpInvocation now presenting via BASIC authentication CredentialsSource-derived: "

                     + credentials.getUsername());

         }

         super.setRequestBody(config, postMethod, baos);

     }

 }