/* Copyright 2004, 2005 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}.
*
* <P>
* Configured in the bean context with a key that should match the key used by
* adapters to generate the <code>RunAsUserToken</code>. It treats as valid
* any <code>RunAsUserToken</code> instance presenting a hash code that
* matches the <code>RunAsImplAuthenticationProvider</code>-configured key.
* </p>
*
* <P>
* If the key does not match, a <code>BadCredentialsException</code> is thrown.
* </p>
*/
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;
}
}
}