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.changepw.io;
021    
022    
023    import java.io.ByteArrayOutputStream;
024    import java.io.IOException;
025    import java.nio.ByteBuffer;
026    
027    import org.apache.directory.server.changepw.value.ChangePasswordData;
028    import org.apache.directory.server.kerberos.shared.io.encoder.PrincipalNameEncoder;
029    import org.apache.directory.shared.asn1.der.ASN1OutputStream;
030    import org.apache.directory.shared.asn1.der.DERGeneralString;
031    import org.apache.directory.shared.asn1.der.DEROctetString;
032    import org.apache.directory.shared.asn1.der.DERSequence;
033    import org.apache.directory.shared.asn1.der.DERTaggedObject;
034    
035    
036    /**
037     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038     * @version $Rev$, $Date$
039     */
040    public class ChangePasswordDataEncoder
041    {
042        /**
043         * Encodes a {@link ChangePasswordData} into a byte array.
044         *
045         * @param data
046         * @return The byte array.
047         * @throws IOException
048         */
049        public byte[] encode( ChangePasswordData data ) throws IOException
050        {
051            ByteArrayOutputStream baos = new ByteArrayOutputStream();
052            ASN1OutputStream aos = new ASN1OutputStream( baos );
053    
054            DERSequence dataSequence = encodeDataSequence( data );
055            aos.writeObject( dataSequence );
056    
057            aos.close();
058    
059            return baos.toByteArray();
060        }
061    
062    
063        /**
064         * Encodes a {@link ChangePasswordData} into a {@link ByteBuffer}.
065         *
066         * @param data
067         * @param out
068         * @throws IOException
069         */
070        public void encode( ChangePasswordData data, ByteBuffer out ) throws IOException
071        {
072            ASN1OutputStream aos = new ASN1OutputStream( out );
073    
074            DERSequence sequence = encodeDataSequence( data );
075            aos.writeObject( sequence );
076    
077            aos.close();
078        }
079    
080    
081        private DERSequence encodeDataSequence( ChangePasswordData data )
082        {
083            DERSequence sequence = new DERSequence();
084            sequence.add( new DERTaggedObject( 0, new DEROctetString( data.getPassword() ) ) );
085    
086            // OPTIONAL
087            if ( data.getPrincipalName() != null )
088            {
089                sequence.add( new DERTaggedObject( 1, PrincipalNameEncoder.encode( data.getPrincipalName() ) ) );
090            }
091    
092            // OPTIONAL
093            if ( data.getRealm() != null )
094            {
095                sequence.add( new DERTaggedObject( 2, DERGeneralString.valueOf( data.getRealm() ) ) );
096            }
097    
098            return sequence;
099        }
100    }