/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/*

 *

 *  (C) Copyright IBM Corp. 1999 All Rights Reserved.

 *  Copyright 1997 The Open Group Research Institute.  All rights reserved.

 */

package sun.security.krb5.internal;

import sun.security.util.*;

import sun.security.krb5.Asn1Exception;

import java.util.Vector;

import java.io.IOException;

import sun.security.krb5.internal.ccache.CCacheOutputStream;

/**

 * In RFC4120, the ASN.1 AuthorizationData is defined as:

 *

 * AuthorizationData            ::= SEQUENCE OF SEQUENCE {

 *              ad-type         [0] Int32,

 *              ad-data         [1] OCTET STRING

 * }

 *

 * Here, two classes are used to implement it and they can be represented as follows:

 *

 * AuthorizationData ::= SEQUENCE OF AuthorizationDataEntry

 * AuthorizationDataEntry ::= SEQUENCE {

 *              ad-type[0]  Int32,

 *              ad-data[1]  OCTET STRING

 * }

 */

public class AuthorizationData implements Cloneable {

        private AuthorizationDataEntry[] entry = null;

        private AuthorizationData() {

        }

        public AuthorizationData(

                AuthorizationDataEntry[] new_entries

        ) throws IOException {

                if (new_entries != null) {

                   entry = new AuthorizationDataEntry[new_entries.length];

                   for (int i = 0; i < new_entries.length; i++) {

                        if (new_entries[i] == null) {

                           throw new IOException("Cannot create an AuthorizationData");

                        } else {

                           entry[i] = (AuthorizationDataEntry)new_entries[i].clone();

                        }

                   }

                }

        }

        public AuthorizationData(

                AuthorizationDataEntry new_entry

        ) {

                entry = new AuthorizationDataEntry[1];

                entry[0] = new_entry;

        }

        public Object clone() {

                AuthorizationData new_authorizationData =

                        new AuthorizationData();

                if (entry != null) {

                        new_authorizationData.entry =

                                new AuthorizationDataEntry[entry.length];

                        for (int i = 0; i < entry.length; i++)

                                new_authorizationData.entry[i] =

                                        (AuthorizationDataEntry)entry[i].clone();

                }

                return new_authorizationData;

        }

        /**

         * Constructs a new <code>AuthorizationData,</code> instance.

         * @param der a single DER-encoded value.

         * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.

         * @exception IOException if an I/O error occurs while reading encoded data.

         */

        public AuthorizationData(DerValue der) throws Asn1Exception, IOException {

                Vector<AuthorizationDataEntry> v =

                    new Vector<AuthorizationDataEntry> ();

                if (der.getTag() != DerValue.tag_Sequence) {

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

                }

                while (der.getData().available() > 0) {

                        v.addElement(new AuthorizationDataEntry(der.getData().getDerValue()));

                }

                if (v.size() > 0) {

                        entry = new AuthorizationDataEntry[v.size()];

                        v.copyInto(entry);

                }

        }

        /**

         * Encodes an <code>AuthorizationData</code> object.

         * @return byte array of encoded <code>AuthorizationData</code> object.

         * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.

         * @exception IOException if an I/O error occurs while reading encoded data.

         */

        public byte[] asn1Encode() throws Asn1Exception, IOException {

                DerOutputStream bytes = new DerOutputStream();

                DerValue der[] = new DerValue[entry.length];

                for (int i = 0; i < entry.length; i++) {

                        der[i] = new DerValue(entry[i].asn1Encode());

                }

                bytes.putSequence(der);

                return bytes.toByteArray();

        }

    /**

     * Parse (unmarshal) an <code>AuthorizationData</code> object from a DER input stream.

     * This form of parsing might be used when expanding a value which is part of

     * a constructed sequence and uses explicitly tagged type.

     *

     * @exception Asn1Exception if an error occurs while decoding an ASN1 encoded data.

     * @exception IOException if an I/O error occurs while reading encoded data.

     * @param data the Der input stream value, which contains one or more marshaled value.

     * @param explicitTag tag number.

     * @param optional indicates if this data field is optional

     * @return an instance of AuthorizationData.

     *

     */

        public static AuthorizationData parse(DerInputStream data, byte explicitTag, boolean optional) throws Asn1Exception, IOException{

                if ((optional) && (((byte)data.peekByte() & (byte)0x1F) != explicitTag)) {

                        return null;

                }

                DerValue der = data.getDerValue();

                if (explicitTag != (der.getTag() & (byte)0x1F))  {

                        throw new Asn1Exception(Krb5.ASN1_BAD_ID);

                }

                else {

                        DerValue subDer = der.getData().getDerValue();

                        return new AuthorizationData(subDer);

                }

        }

        /**

         * Writes <code>AuthorizationData</code> data fields to a output stream.

         *

         * @param cos a <code>CCacheOutputStream</code> to be written to.

         * @exception IOException if an I/O exception occurs.

         */

        public void writeAuth(CCacheOutputStream cos) throws IOException {

                for (int i = 0; i < entry.length; i++) {

                        entry[i].writeEntry(cos);

                }

        }

    public String toString() {

        String retVal = "AuthorizationData:\n";

        for (int i = 0; i < entry.length; i++) {

            retVal += entry[i].toString();

        }

        return retVal;

    }

}