Java tutorial
/* 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.rememberme; 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.rememberme.RememberMeAuthenticationToken}s.<p>To be successfully validated, the * {@link org.acegisecurity.providers.rememberme.RememberMeAuthenticationToken#getKeyHash()} must match this class' * {@link #getKey()}.</p> */ public class RememberMeAuthenticationProvider implements AuthenticationProvider, InitializingBean, MessageSourceAware { //~ Static fields/initializers ===================================================================================== private static final Log logger = LogFactory.getLog(RememberMeAuthenticationProvider.class); //~ Instance fields ================================================================================================ protected MessageSourceAccessor messages = AcegiMessageSource.getAccessor(); private String key; //~ Methods ======================================================================================================== public void afterPropertiesSet() throws Exception { Assert.hasLength(key); 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() != ((RememberMeAuthenticationToken) authentication).getKeyHash()) { throw new BadCredentialsException(messages.getMessage("RememberMeAuthenticationProvider.incorrectKey", "The presented RememberMeAuthenticationToken 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 (RememberMeAuthenticationToken.class.isAssignableFrom(authentication)); } }