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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  
26  import org.apache.directory.server.kerberos.shared.messages.ApplicationRequest;
27  import org.apache.directory.shared.asn1.der.ASN1OutputStream;
28  import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
29  import org.apache.directory.shared.asn1.der.DERBitString;
30  import org.apache.directory.shared.asn1.der.DERInteger;
31  import org.apache.directory.shared.asn1.der.DERSequence;
32  import org.apache.directory.shared.asn1.der.DERTaggedObject;
33  
34  
35  /**
36   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
37   * @version $Rev: 540371 $, $Date: 2007-05-21 17:00:43 -0700 (Mon, 21 May 2007) $
38   */
39  public class ApplicationRequestEncoder
40  {
41      /**
42       * Application code constant for the {@link ApplicationRequest} (14).
43       */
44      public static final int APPLICATION_CODE = 14;
45  
46  
47      /**
48       * Encodes an {@link ApplicationRequest} into a byte array.
49       *
50       * @param request
51       * @return The byte array.
52       * @throws IOException
53       */
54      public byte[] encode( ApplicationRequest request ) throws IOException
55      {
56          ByteArrayOutputStream baos = new ByteArrayOutputStream();
57          ASN1OutputStream aos = new ASN1OutputStream( baos );
58  
59          DERSequence requestSequence = encodeReplySequence( request );
60          aos.writeObject( DERApplicationSpecific.valueOf( APPLICATION_CODE, requestSequence ) );
61          aos.close();
62  
63          return baos.toByteArray();
64      }
65  
66  
67      /*
68       AP-REQ ::=      [APPLICATION 14] SEQUENCE {
69       pvno[0]                       INTEGER,
70       msg-type[1]                   INTEGER,
71       ap-options[2]                 APOptions,
72       ticket[3]                     Ticket,
73       authenticator[4]              EncryptedData
74       }
75       */
76      private DERSequence encodeReplySequence( ApplicationRequest message )
77      {
78          DERSequence sequence = new DERSequence();
79  
80          sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( message.getProtocolVersionNumber() ) ) );
81          sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( message.getMessageType().getOrdinal() ) ) );
82          sequence.add( new DERTaggedObject( 2, new DERBitString( message.getApOptions().getBytes() ) ) );
83          sequence.add( new DERTaggedObject( 3, TicketEncoder.encode( message.getTicket() ) ) );
84          sequence.add( new DERTaggedObject( 4, EncryptedDataEncoder.encodeSequence( message.getEncPart() ) ) );
85  
86          return sequence;
87      }
88  }