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.util.Arrays;
024    import java.util.Iterator;
025    import java.util.List;
026    
027    import javax.security.auth.kerberos.KerberosPrincipal;
028    
029    import org.apache.directory.server.kerberos.shared.messages.value.PrincipalName;
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.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: 587146 $, $Date: 2007-10-22 18:28:37 +0200 (Mon, 22 Oct 2007) $
039     */
040    public class PrincipalNameEncoder
041    {
042        private static final String COMPONENT_SEPARATOR = "/";
043        private static final String REALM_SEPARATOR = "@";
044    
045    
046        /**
047         * Encodes a {@link KerberosPrincipal} into a {@link DERSequence}.
048         * 
049         * PrincipalName ::=   SEQUENCE {
050         *               name-type[0]     INTEGER,
051         *               name-string[1]   SEQUENCE OF GeneralString
052         * }
053         * 
054         * @param principal 
055         * @return The {@link DERSequence}.
056         */
057        public static DERSequence encode( KerberosPrincipal principal )
058        {
059            DERSequence vector = new DERSequence();
060    
061            vector.add( new DERTaggedObject( 0, DERInteger.valueOf( principal.getNameType() ) ) );
062            vector.add( new DERTaggedObject( 1, encodeNameSequence( principal ) ) );
063    
064            return vector;
065        }
066    
067    
068        /**
069         * Encodes a {@link PrincipalName} into a {@link DERSequence}.
070         *
071         * @param name
072         * @return The {@link DERSequence}.
073         */
074        public static DERSequence encode( PrincipalName name )
075        {
076            DERSequence vector = new DERSequence();
077    
078            vector.add( new DERTaggedObject( 0, DERInteger.valueOf( name.getNameType().getOrdinal() ) ) );
079            vector.add( new DERTaggedObject( 1, encodeNameSequence( name ) ) );
080    
081            return vector;
082        }
083    
084    
085        private static DERSequence encodeNameSequence( KerberosPrincipal principal )
086        {
087            Iterator<String> it = getNameStrings( principal ).iterator();
088    
089            DERSequence vector = new DERSequence();
090    
091            while ( it.hasNext() )
092            {
093                vector.add( DERGeneralString.valueOf( it.next() ) );
094            }
095    
096            return vector;
097        }
098    
099    
100        private static List<String> getNameStrings( KerberosPrincipal principal )
101        {
102            String nameComponent = principal.getName().split( REALM_SEPARATOR )[0];
103            String[] components = nameComponent.split( COMPONENT_SEPARATOR );
104            return Arrays.asList( components );
105        }
106    
107    
108        private static DERSequence encodeNameSequence( PrincipalName principalName )
109        {
110            DERSequence vector = new DERSequence();
111    
112            for ( String name:principalName.getNames() )
113            {
114                vector.add( DERGeneralString.valueOf( name ) );
115            }
116    
117            return vector;
118        }
119    }