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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.kerberos.shared.io.encoder;
21  
22  
23  import java.io.ByteArrayOutputStream;
24  import java.io.IOException;
25  import java.nio.ByteBuffer;
26  
27  import org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
28  import org.apache.directory.shared.asn1.der.ASN1OutputStream;
29  import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
30  import org.apache.directory.shared.asn1.der.DERGeneralString;
31  import org.apache.directory.shared.asn1.der.DERInteger;
32  import org.apache.directory.shared.asn1.der.DEROctetString;
33  import org.apache.directory.shared.asn1.der.DERSequence;
34  import org.apache.directory.shared.asn1.der.DERTaggedObject;
35  
36  
37  /**
38   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
39   * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Di, 22 Mai 2007) $
40   */
41  public class ErrorMessageEncoder
42  {
43      /**
44       * Encodes an {@link ErrorMessage} into a {@link ByteBuffer}.
45       *
46       * @param message
47       * @param out
48       * @throws IOException
49       */
50      public void encode( ErrorMessage message, ByteBuffer out ) throws IOException
51      {
52          ASN1OutputStream aos = new ASN1OutputStream( out );
53  
54          DERSequence errorReply = encodeErrorMessageSequence( message );
55          aos.writeObject( DERApplicationSpecific.valueOf( message.getMessageType().getOrdinal(), errorReply ) );
56  
57          aos.close();
58      }
59  
60  
61      /**
62       * Encodes an {@link ErrorMessage} into a byte array.
63       *
64       * @param message
65       * @return The byte array.
66       * @throws IOException
67       */
68      public byte[] encode( ErrorMessage message ) throws IOException
69      {
70          ByteArrayOutputStream baos = new ByteArrayOutputStream();
71          ASN1OutputStream aos = new ASN1OutputStream( baos );
72  
73          DERSequence errorReply = encodeErrorMessageSequence( message );
74          aos.writeObject( DERApplicationSpecific.valueOf( message.getMessageType().getOrdinal(), errorReply ) );
75  
76          aos.close();
77  
78          return baos.toByteArray();
79      }
80  
81  
82      private DERSequence encodeErrorMessageSequence( ErrorMessage message )
83      {
84          DERSequence sequence = new DERSequence();
85  
86          sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( message.getProtocolVersionNumber() ) ) );
87  
88          sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( message.getMessageType().getOrdinal() ) ) );
89  
90          if ( message.getClientTime() != null )
91          {
92              sequence.add( new DERTaggedObject( 2, KerberosTimeEncoder.encode( message.getClientTime() ) ) );
93          }
94  
95          if ( message.getClientMicroSecond() != null )
96          {
97              sequence.add( new DERTaggedObject( 3, DERInteger.valueOf( message.getClientMicroSecond().intValue() ) ) );
98          }
99  
100         sequence.add( new DERTaggedObject( 4, KerberosTimeEncoder.encode( message.getServerTime() ) ) );
101 
102         sequence.add( new DERTaggedObject( 5, DERInteger.valueOf( message.getServerMicroSecond() ) ) );
103 
104         sequence.add( new DERTaggedObject( 6, DERInteger.valueOf( message.getErrorCode() ) ) );
105 
106         if ( message.getClientPrincipal() != null )
107         {
108             sequence.add( new DERTaggedObject( 7, DERGeneralString.valueOf( message.getClientPrincipal().getRealm()
109                 .toString() ) ) );
110         }
111 
112         if ( message.getClientPrincipal() != null )
113         {
114             sequence.add( new DERTaggedObject( 8, PrincipalNameEncoder.encode( message.getClientPrincipal() ) ) );
115         }
116 
117         sequence.add( new DERTaggedObject( 9, DERGeneralString.valueOf( message.getServerPrincipal().getRealm() ) ) );
118 
119         sequence.add( new DERTaggedObject( 10, PrincipalNameEncoder.encode( message.getServerPrincipal() ) ) );
120 
121         if ( message.getExplanatoryText() != null )
122         {
123             sequence.add( new DERTaggedObject( 11, DERGeneralString.valueOf( message.getExplanatoryText() ) ) );
124         }
125 
126         if ( message.getExplanatoryData() != null )
127         {
128             sequence.add( new DERTaggedObject( 12, new DEROctetString( message.getExplanatoryData() ) ) );
129         }
130 
131         return sequence;
132     }
133 }