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Java example source code file (AuthorizationData.java)

This example Java source code file (AuthorizationData.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

asn1exception, authorizationdata, authorizationdata\:\\n, authorizationdataentry, cannot, cloneable, deroutputstream, dervalue, ioexception, object, string, util, vector

The AuthorizationData.java Java example source code

/*
 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.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, 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<>();
        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 object.
     * @return byte array of encoded <code>AuthorizationData 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 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 data fields to a output stream.
     *
     * @param cos a <code>CCacheOutputStream 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;
    }

    public int count() {
        return entry.length;
    }

    public AuthorizationDataEntry item(int i) {
        return (AuthorizationDataEntry)entry[i].clone();
    }
}

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