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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.changepw.io;
21  
22  
23  import java.io.IOException;
24  import java.nio.ByteBuffer;
25  
26  import org.apache.directory.server.changepw.messages.ChangePasswordError;
27  import org.apache.directory.server.changepw.messages.ChangePasswordErrorModifier;
28  import org.apache.directory.server.kerberos.shared.io.decoder.ErrorMessageDecoder;
29  import org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
30  
31  
32  /**
33   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
34   * @version $Rev$, $Date$
35   */
36  public class ChangePasswordErrorDecoder
37  {
38      private static final int HEADER_LENGTH = 6;
39  
40  
41      /**
42       * Decodes a {@link ByteBuffer} into a {@link ChangePasswordError}.
43       *
44       * @param buf
45       * @return The {@link ChangePasswordError}.
46       * @throws IOException
47       */
48      public ChangePasswordError decode( ByteBuffer buf ) throws IOException
49      {
50          ChangePasswordErrorModifier modifier = new ChangePasswordErrorModifier();
51  
52          short messageLength = buf.getShort();
53  
54          modifier.setProtocolVersionNumber( buf.getShort() );
55  
56          // AP_REQ length will be 0 for error messages
57          buf.getShort(); // authHeader length
58  
59          int errorLength = messageLength - HEADER_LENGTH;
60  
61          byte[] errorBytes = new byte[errorLength];
62  
63          buf.get( errorBytes );
64          ByteBuffer errorBuffer = ByteBuffer.wrap( errorBytes );
65  
66          ErrorMessageDecoder errorDecoder = new ErrorMessageDecoder();
67          ErrorMessage errorMessage = errorDecoder.decode( errorBuffer );
68  
69          modifier.setErrorMessage( errorMessage );
70  
71          return modifier.getChangePasswordError();
72      }
73  }