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    
021    package org.apache.directory.server.changepw.io;
022    
023    
024    import java.io.IOException;
025    import java.util.Enumeration;
026    
027    import org.apache.directory.server.changepw.value.ChangePasswordData;
028    import org.apache.directory.server.changepw.value.ChangePasswordDataModifier;
029    import org.apache.directory.server.kerberos.shared.io.decoder.PrincipalNameDecoder;
030    import org.apache.directory.shared.asn1.der.ASN1InputStream;
031    import org.apache.directory.shared.asn1.der.DEREncodable;
032    import org.apache.directory.shared.asn1.der.DERGeneralString;
033    import org.apache.directory.shared.asn1.der.DEROctetString;
034    import org.apache.directory.shared.asn1.der.DERSequence;
035    import org.apache.directory.shared.asn1.der.DERTaggedObject;
036    
037    
038    /**
039     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
040     * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Tue, 22 May 2007) $
041     */
042    public class ChangePasswordDataDecoder
043    {
044        /**
045         * Decodes bytes into a ChangePasswordData.
046         *
047         * @param encodedChangePasswdData
048         * @return The {@link ChangePasswordData}.
049         * @throws IOException
050         */
051        public ChangePasswordData decodeChangePasswordData( byte[] encodedChangePasswdData ) throws IOException
052        {
053            ASN1InputStream ais = new ASN1InputStream( encodedChangePasswdData );
054    
055            DERSequence sequence = ( DERSequence ) ais.readObject();
056    
057            return decodeChangePasswdData( sequence );
058        }
059    
060    
061        protected ChangePasswordData decodeChangePasswdData( DERSequence sequence )
062        {
063            ChangePasswordDataModifier modifier = new ChangePasswordDataModifier();
064    
065            for ( Enumeration e = sequence.getObjects(); e.hasMoreElements(); )
066            {
067                DERTaggedObject object = ( ( DERTaggedObject ) e.nextElement() );
068                int tag = object.getTagNo();
069                DEREncodable derObject = object.getObject();
070                switch ( tag )
071                {
072                    case 0:
073                        DEROctetString tag0 = ( DEROctetString ) derObject;
074                        modifier.setNewPassword( tag0.getOctets() );
075                        break;
076                    case 1:
077                        DERSequence tag1 = ( DERSequence ) derObject;
078                        modifier.setTargetName( PrincipalNameDecoder.decode( tag1 ) );
079                        break;
080                    case 2:
081                        DERGeneralString tag2 = ( DERGeneralString ) derObject;
082                        modifier.setTargetRealm( tag2.getString() );
083                        break;
084                    default:
085                        break;
086                }
087            }
088    
089            return modifier.getChangePasswdData();
090        }
091    }