/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.kerberos.shared.io.decoder;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.directory.server.kerberos.shared.messages.Encodable;
import org.apache.directory.server.kerberos.shared.messages.value.AuthorizationData;
import org.apache.directory.server.kerberos.shared.messages.value.AuthorizationDataEntry;
import org.apache.directory.server.kerberos.shared.messages.value.types.AuthorizationType;
import org.apache.directory.shared.asn1.der.ASN1InputStream;
import org.apache.directory.shared.asn1.der.DEREncodable;
import org.apache.directory.shared.asn1.der.DERInteger;
import org.apache.directory.shared.asn1.der.DEROctetString;
import org.apache.directory.shared.asn1.der.DERSequence;
import org.apache.directory.shared.asn1.der.DERTaggedObject;
/**
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
* @version $Rev: 587531 $, $Date: 2007-10-23 16:59:10 +0200 (Mar, 23 oct 2007) $
*/
public class AuthorizationDataDecoder implements Decoder, DecoderFactory
{
public Decoder getDecoder()
{
return new AuthorizationDataDecoder();
}
public Encodable decode( byte[] encodedAuthData ) throws IOException
{
ASN1InputStream ais = new ASN1InputStream( encodedAuthData );
DERSequence sequence = ( DERSequence ) ais.readObject();
return decodeSequence( sequence );
}
/**
* AuthorizationData ::= SEQUENCE OF SEQUENCE {
* ad-type[0] INTEGER,
* ad-data[1] OCTET STRING
* }
*/
protected static AuthorizationData decodeSequence( DERSequence sequence )
{
AuthorizationData authData = new AuthorizationData();
for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
{
DERSequence object = ( DERSequence ) e.nextElement();
AuthorizationDataEntry entry = decodeAuthorizationEntry( object );
authData.add( entry );
}
return authData;
}
protected static AuthorizationDataEntry decodeAuthorizationEntry( DERSequence sequence )
{
AuthorizationType type = AuthorizationType.NULL;
byte[] data = null;
for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
{
DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
int tag = object.getTagNo();
DEREncodable derObject = object.getObject();
switch ( tag )
{
case 0:
DERInteger tag0 = ( DERInteger ) derObject;
type = AuthorizationType.getTypeByOrdinal( tag0.intValue() );
break;
case 1:
DEROctetString tag1 = ( DEROctetString ) derObject;
data = tag1.getOctets();
break;
}
}
return new AuthorizationDataEntry( type, data );
}
}