alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (SubjectInfoAccessExtension.java)

This example Java source code file (SubjectInfoAccessExtension.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

accessdescription, arraylist, attribute, attributenameenumeration, certattrset\:subjectinfoaccessextension, deroutputstream, dervalue, illegal, ioexception, list, name, object, string, subjectinfoaccessextension, util

The SubjectInfoAccessExtension.java Java example source code

/*
 * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
 * 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.
 */

package sun.security.x509;

import java.io.IOException;
import java.io.OutputStream;

import java.util.*;

import sun.security.util.DerOutputStream;
import sun.security.util.DerValue;

/**
 * The Subject Information Access Extension (OID = 1.3.6.1.5.5.7.1.11).
 * <p>
 * The subject information access extension indicates how to access
 * information and services for the subject of the certificate in which
 * the extension appears.  When the subject is a CA, information and
 * services may include certificate validation services and CA policy
 * data.  When the subject is an end entity, the information describes
 * the type of services offered and how to access them.  In this case,
 * the contents of this extension are defined in the protocol
 * specifications for the supported services.  This extension may be
 * included in end entity or CA certificates.  Conforming CAs MUST mark
 * this extension as non-critical.
 * <p>
 * This extension is defined in <a href="http://www.ietf.org/rfc/rfc3280.txt">
 * Internet X.509 PKI Certificate and Certificate Revocation List
 * (CRL) Profile</a>. The profile permits
 * the extension to be included in end-entity or CA certificates,
 * and it must be marked as non-critical. Its ASN.1 definition is as follows:
 * <pre>
 *   id-pe-subjectInfoAccess OBJECT IDENTIFIER ::= { id-pe 11 }
 *
 *   SubjectInfoAccessSyntax  ::=
 *          SEQUENCE SIZE (1..MAX) OF AccessDescription
 *
 *   AccessDescription  ::=  SEQUENCE {
 *          accessMethod          OBJECT IDENTIFIER,
 *          accessLocation        GeneralName  }
 * </pre>
 * <p>
 * @see Extension
 * @see CertAttrSet
 */

public class SubjectInfoAccessExtension extends Extension
        implements CertAttrSet<String> {

    /**
     * Identifier for this attribute, to be used with the
     * get, set, delete methods of Certificate, x509 type.
     */
    public static final String IDENT =
                                "x509.info.extensions.SubjectInfoAccess";

    /**
     * Attribute name.
     */
    public static final String NAME = "SubjectInfoAccess";
    public static final String DESCRIPTIONS = "descriptions";

    /**
     * The List of AccessDescription objects.
     */
    private List<AccessDescription> accessDescriptions;

    /**
     * Create an SubjectInfoAccessExtension from a List of
     * AccessDescription; the criticality is set to false.
     *
     * @param accessDescriptions the List of AccessDescription
     * @throws IOException on error
     */
    public SubjectInfoAccessExtension(
            List<AccessDescription> accessDescriptions) throws IOException {
        this.extensionId = PKIXExtensions.SubjectInfoAccess_Id;
        this.critical = false;
        this.accessDescriptions = accessDescriptions;
        encodeThis();
    }

    /**
     * Create the extension from the passed DER encoded value of the same.
     *
     * @param critical true if the extension is to be treated as critical.
     * @param value Array of DER encoded bytes of the actual value.
     * @exception IOException on error.
     */
    public SubjectInfoAccessExtension(Boolean critical, Object value)
            throws IOException {
        this.extensionId = PKIXExtensions.SubjectInfoAccess_Id;
        this.critical = critical.booleanValue();

        if (!(value instanceof byte[])) {
            throw new IOException("Illegal argument type");
        }

        extensionValue = (byte[])value;
        DerValue val = new DerValue(extensionValue);
        if (val.tag != DerValue.tag_Sequence) {
            throw new IOException("Invalid encoding for " +
                                  "SubjectInfoAccessExtension.");
        }
        accessDescriptions = new ArrayList<AccessDescription>();
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            AccessDescription accessDescription = new AccessDescription(seq);
            accessDescriptions.add(accessDescription);
        }
    }

    /**
     * Return the list of AccessDescription objects.
     */
    public List<AccessDescription> getAccessDescriptions() {
        return accessDescriptions;
    }

    /**
     * Return the name of this attribute.
     */
    public String getName() {
        return NAME;
    }

    /**
     * Write the extension to the DerOutputStream.
     *
     * @param out the DerOutputStream to write the extension to.
     * @exception IOException on encoding errors.
     */
    public void encode(OutputStream out) throws IOException {
        DerOutputStream tmp = new DerOutputStream();
        if (this.extensionValue == null) {
            this.extensionId = PKIXExtensions.SubjectInfoAccess_Id;
            this.critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    /**
     * Set the attribute value.
     */
    @SuppressWarnings("unchecked") // Checked with instanceof
    public void set(String name, Object obj) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            if (!(obj instanceof List)) {
                throw new IOException("Attribute value should be of type List.");
            }
            accessDescriptions = (List<AccessDescription>)obj;
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
        encodeThis();
    }

    /**
     * Get the attribute value.
     */
    public List<AccessDescription> get(String name) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            return accessDescriptions;
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
    }

    /**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        if (name.equalsIgnoreCase(DESCRIPTIONS)) {
            accessDescriptions = new ArrayList<AccessDescription>();
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:SubjectInfoAccessExtension.");
        }
        encodeThis();
    }

    /**
     * Return an enumeration of names of attributes existing within this
     * attribute.
     */
    public Enumeration<String> getElements() {
        AttributeNameEnumeration elements = new AttributeNameEnumeration();
        elements.addElement(DESCRIPTIONS);
        return elements.elements();
    }

     // Encode this extension value
    private void encodeThis() throws IOException {
        if (accessDescriptions.isEmpty()) {
            this.extensionValue = null;
        } else {
            DerOutputStream ads = new DerOutputStream();
            for (AccessDescription accessDescription : accessDescriptions) {
                accessDescription.encode(ads);
            }
            DerOutputStream seq = new DerOutputStream();
            seq.write(DerValue.tag_Sequence, ads);
            this.extensionValue = seq.toByteArray();
        }
    }

    /**
     * Return the extension as user readable string.
     */
    public String toString() {
        return super.toString() + "SubjectInfoAccess [\n  "
               + accessDescriptions + "\n]\n";
    }

}

Other Java examples (source code examples)

Here is a short list of links related to this Java SubjectInfoAccessExtension.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2024 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.