1 /* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 package org.acegisecurity.providers.jaas;
17
18 import org.acegisecurity.Authentication;
19
20 import org.acegisecurity.userdetails.UserDetails;
21
22 import java.io.IOException;
23
24 import javax.security.auth.callback.Callback;
25 import javax.security.auth.callback.NameCallback;
26 import javax.security.auth.callback.UnsupportedCallbackException;
27
28
29 /**
30 * The most basic Callbacks to be handled when using a LoginContext from JAAS, are the NameCallback and
31 * PasswordCallback. The acegi security framework provides the JaasNameCallbackHandler specifically tailored to
32 * handling the NameCallback. <br>
33 *
34 * @author Ray Krueger
35 * @version $Id: JaasNameCallbackHandler.java 1496 2006-05-23 13:38:33Z benalex $
36 *
37 * @see <a href="http://java.sun.com/j2se/1.4.2/docs/api/javax/security/auth/callback/Callback.html">Callback</a>
38 * @see <a
39 * href="http://java.sun.com/j2se/1.4.2/docs/api/javax/security/auth/callback/NameCallback.html">NameCallback</a>
40 */
41 public class JaasNameCallbackHandler implements JaasAuthenticationCallbackHandler {
42 //~ Methods ========================================================================================================
43
44 /**
45 * If the callback passed to the 'handle' method is an instance of NameCallback, the
46 * JaasNameCallbackHandler will call, callback.setName(authentication.getPrincipal().toString()).
47 *
48 * @param callback
49 * @param authentication
50 *
51 * @throws IOException
52 * @throws UnsupportedCallbackException
53 */
54 public void handle(Callback callback, Authentication authentication)
55 throws IOException, UnsupportedCallbackException {
56 if (callback instanceof NameCallback) {
57 NameCallback ncb = (NameCallback) callback;
58 String username = "";
59
60 Object principal = authentication.getPrincipal();
61
62 if (principal instanceof UserDetails) {
63 username = ((UserDetails) principal).getUsername();
64 } else {
65 username = principal.toString();
66 }
67
68 ncb.setName(username);
69 }
70 }
71 }