/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited

  *

  * 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 org.acegisecurity.providers.anonymous;

 import org.acegisecurity.AcegiMessageSource;

 import org.acegisecurity.Authentication;

 import org.acegisecurity.AuthenticationException;

 import org.acegisecurity.BadCredentialsException;

 import org.acegisecurity.providers.AuthenticationProvider;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.springframework.beans.factory.InitializingBean;

 import org.springframework.context.MessageSource;

 import org.springframework.context.MessageSourceAware;

 import org.springframework.context.support.MessageSourceAccessor;

 import org.springframework.util.Assert;

 /**

  * An {@link AuthenticationProvider} implementation that validates {@link

  * org.acegisecurity.providers.anonymous.AnonymousAuthenticationToken}s.<p>To be successfully validated, the

  * {@link org.acegisecurity.providers.anonymous.AnonymousAuthenticationToken#getKeyHash()} must match this class'

  * {@link #getKey()}.</p>

  */

 public class AnonymousAuthenticationProvider implements AuthenticationProvider, InitializingBean, MessageSourceAware {

     //~ Static fields/initializers =====================================================================================

     private static final Log logger = LogFactory.getLog(AnonymousAuthenticationProvider.class);

     //~ Instance fields ================================================================================================

     protected MessageSourceAccessor messages = AcegiMessageSource.getAccessor();

     private String key;

     //~ Methods ========================================================================================================

         public void afterPropertiesSet() throws Exception {

         Assert.hasLength(key, "A Key is required");

         Assert.notNull(this.messages, "A message source must be set");

     }

     public Authentication authenticate(Authentication authentication)

         throws AuthenticationException {

         if (!supports(authentication.getClass())) {

             return null;

         }

         if (this.key.hashCode() != ((AnonymousAuthenticationToken) authentication).getKeyHash()) {

             throw new BadCredentialsException(messages.getMessage("AnonymousAuthenticationProvider.incorrectKey",

                     "The presented AnonymousAuthenticationToken does not contain the expected key"));

         }

         return authentication;

     }

     public String getKey() {

         return key;

     }

     public void setKey(String key) {

         this.key = key;

     }

     public void setMessageSource(MessageSource messageSource) {

         this.messages = new MessageSourceAccessor(messageSource);

     }

     public boolean supports(Class authentication) {

         return (AnonymousAuthenticationToken.class.isAssignableFrom(authentication));

     }

 }