001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.server.kerberos.shared.io.encoder;
021    
022    
023    import java.io.ByteArrayOutputStream;
024    import java.io.IOException;
025    import java.nio.ByteBuffer;
026    
027    import org.apache.directory.server.kerberos.shared.messages.ErrorMessage;
028    import org.apache.directory.shared.asn1.der.ASN1OutputStream;
029    import org.apache.directory.shared.asn1.der.DERApplicationSpecific;
030    import org.apache.directory.shared.asn1.der.DERGeneralString;
031    import org.apache.directory.shared.asn1.der.DERInteger;
032    import org.apache.directory.shared.asn1.der.DEROctetString;
033    import org.apache.directory.shared.asn1.der.DERSequence;
034    import org.apache.directory.shared.asn1.der.DERTaggedObject;
035    
036    
037    /**
038     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
039     * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Tue, 22 May 2007) $
040     */
041    public class ErrorMessageEncoder
042    {
043        /**
044         * Encodes an {@link ErrorMessage} into a {@link ByteBuffer}.
045         *
046         * @param message
047         * @param out
048         * @throws IOException
049         */
050        public void encode( ErrorMessage message, ByteBuffer out ) throws IOException
051        {
052            ASN1OutputStream aos = new ASN1OutputStream( out );
053    
054            DERSequence errorReply = encodeErrorMessageSequence( message );
055            aos.writeObject( DERApplicationSpecific.valueOf( message.getMessageType().getOrdinal(), errorReply ) );
056    
057            aos.close();
058        }
059    
060    
061        /**
062         * Encodes an {@link ErrorMessage} into a byte array.
063         *
064         * @param message
065         * @return The byte array.
066         * @throws IOException
067         */
068        public byte[] encode( ErrorMessage message ) throws IOException
069        {
070            ByteArrayOutputStream baos = new ByteArrayOutputStream();
071            ASN1OutputStream aos = new ASN1OutputStream( baos );
072    
073            DERSequence errorReply = encodeErrorMessageSequence( message );
074            aos.writeObject( DERApplicationSpecific.valueOf( message.getMessageType().getOrdinal(), errorReply ) );
075    
076            aos.close();
077    
078            return baos.toByteArray();
079        }
080    
081    
082        private DERSequence encodeErrorMessageSequence( ErrorMessage message )
083        {
084            DERSequence sequence = new DERSequence();
085    
086            sequence.add( new DERTaggedObject( 0, DERInteger.valueOf( message.getProtocolVersionNumber() ) ) );
087    
088            sequence.add( new DERTaggedObject( 1, DERInteger.valueOf( message.getMessageType().getOrdinal() ) ) );
089    
090            if ( message.getClientTime() != null )
091            {
092                sequence.add( new DERTaggedObject( 2, KerberosTimeEncoder.encode( message.getClientTime() ) ) );
093            }
094    
095            if ( message.getClientMicroSecond() != null )
096            {
097                sequence.add( new DERTaggedObject( 3, DERInteger.valueOf( message.getClientMicroSecond().intValue() ) ) );
098            }
099    
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    }