1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.directory.server.kerberos.changepwd.io;
21
22
23 import java.nio.ByteBuffer;
24 import java.nio.InvalidMarkException;
25
26 import org.apache.directory.server.kerberos.changepwd.exceptions.ChangePasswordException;
27 import org.apache.directory.server.kerberos.changepwd.messages.AbstractPasswordMessage;
28 import org.apache.directory.server.kerberos.changepwd.messages.ChangePasswordError;
29 import org.apache.directory.server.kerberos.changepwd.messages.ChangePasswordReply;
30 import org.apache.directory.server.kerberos.changepwd.messages.ChangePasswordRequest;
31
32
33 /**
34 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35 */
36 public class ChangePasswordDecoder
37 {
38 public static AbstractPasswordMessage decode( ByteBuffer buf, boolean isTcp ) throws ChangePasswordException
39 {
40 if ( isTcp )
41 {
42 // For TCP transport, there is a 4 octet header in network byte order
43 // that precedes the message and specifies the length of the message.
44 buf.getInt();
45 buf.mark();
46 }
47
48 // cause we don't have a special message type value, try decoding as request, reply and error and send whichever succeeds
49
50 try
51 {
52 return ChangePasswordRequest.decode( buf );
53 }
54 catch ( Exception e )
55 {
56 resetOrRewind( buf );
57 }
58
59 try
60 {
61 return ChangePasswordReply.decode( buf );
62 }
63 catch ( Exception e )
64 {
65 resetOrRewind( buf );
66 }
67
68 return ChangePasswordError.decode( buf );
69 }
70
71
72 private static void resetOrRewind( ByteBuffer buf )
73 {
74 try
75 {
76 buf.reset();
77 }
78 catch ( InvalidMarkException e )
79 {
80 buf.rewind();
81 }
82 }
83 }