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/* 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.runas;

import org.acegisecurity.AcegiMessageSource;
import org.acegisecurity.Authentication;
import org.acegisecurity.AuthenticationException;
import org.acegisecurity.BadCredentialsException;

import org.acegisecurity.providers.AuthenticationProvider;

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 can authenticate a {@link RunAsUserToken}.

Configured in * the bean context with a key that should match the key used by adapters to generate the RunAsUserToken. * It treats as valid any RunAsUserToken instance presenting a hash code that matches the * RunAsImplAuthenticationProvider-configured key.

*

If the key does not match, a BadCredentialsException is thrown.

*/ public class RunAsImplAuthenticationProvider implements InitializingBean, AuthenticationProvider, MessageSourceAware { //~ Instance fields ================================================================================================ protected MessageSourceAccessor messages = AcegiMessageSource.getAccessor(); private String key; //~ Methods ======================================================================================================== public void afterPropertiesSet() throws Exception { Assert.notNull(key, "A Key is required and should match that configured for the RunAsManagerImpl"); } public Authentication authenticate(Authentication authentication) throws AuthenticationException { RunAsUserToken token = (RunAsUserToken) authentication; if (token.getKeyHash() == key.hashCode()) { return authentication; } else { throw new BadCredentialsException(messages.getMessage("RunAsImplAuthenticationProvider.incorrectKey", "The presented RunAsUserToken does not contain the expected key")); } } 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) { if (RunAsUserToken.class.isAssignableFrom(authentication)) { return true; } else { return false; } } }




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