/*
* 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.springframework.security.authentication.jaas;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.userdetails.UserDetails;
import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
/**
* The most basic Callbacks to be handled when using a LoginContext from JAAS, are the
* NameCallback and PasswordCallback. Spring Security provides the JaasNameCallbackHandler
* specifically tailored to handling the NameCallback. <br>
*
* @author Ray Krueger
*
* @see <a
* href="http://java.sun.com/j2se/1.4.2/docs/api/javax/security/auth/callback/Callback.html">Callback</a>
* @see <a
* href="http://java.sun.com/j2se/1.4.2/docs/api/javax/security/auth/callback/NameCallback.html">NameCallback</a>
*/
public class JaasNameCallbackHandler implements JaasAuthenticationCallbackHandler {
// ~ Methods
// ========================================================================================================
/**
* If the callback passed to the 'handle' method is an instance of NameCallback, the
* JaasNameCallbackHandler will call,
* callback.setName(authentication.getPrincipal().toString()).
*
* @param callback
* @param authentication
*
* @throws IOException
* @throws UnsupportedCallbackException
*/
public void handle(Callback callback, Authentication authentication)
throws IOException, UnsupportedCallbackException {
if (callback instanceof NameCallback) {
NameCallback ncb = (NameCallback) callback;
String username;
Object principal = authentication.getPrincipal();
if (principal instanceof UserDetails) {
username = ((UserDetails) principal).getUsername();
}
else {
username = principal.toString();
}
ncb.setName(username);
}
}
}