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Java example source code file (CRLDistributionPointsExtension.java)

This example Java source code file (CRLDistributionPointsExtension.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

arraylist, attribute, attributenameenumeration, certattrset, crldistributionpointsextension, deroutputstream, dervalue, ioexception, list, name, object, objectidentifier, string, suppresswarnings, util

The CRLDistributionPointsExtension.java Java example source code

/*
 * Copyright (c) 2002, 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;
import sun.security.util.ObjectIdentifier;

/**
 * Represent the CRL Distribution Points Extension (OID = 2.5.29.31).
 * <p>
 * The CRL distribution points extension identifies how CRL information
 * is obtained.  The extension SHOULD be non-critical, but the PKIX profile
 * recommends support for this extension by CAs and applications.
 * <p>
 * For PKIX, if the cRLDistributionPoints extension contains a
 * DistributionPointName of type URI, the following semantics MUST be
 * assumed: the URI is a pointer to the current CRL for the associated
 * reasons and will be issued by the associated cRLIssuer.  The
 * expected values for the URI conform to the following rules.  The
 * name MUST be a non-relative URL, and MUST follow the URL syntax and
 * encoding rules specified in [RFC 1738].  The name must include both
 * a scheme (e.g., "http" or "ftp") and a scheme-specific-part.  The
 * scheme- specific-part must include a fully qualified domain name or
 * IP address as the host.  As specified in [RFC 1738], the scheme
 * name is not case-sensitive (e.g., "http" is equivalent to "HTTP").
 * The host part is also not case-sensitive, but other components of
 * the scheme-specific-part may be case-sensitive. When comparing
 * URIs, conforming implementations MUST compare the scheme and host
 * without regard to case, but assume the remainder of the
 * scheme-specific-part is case sensitive.  Processing rules for other
 * values are not defined by this specification.  If the
 * distributionPoint omits reasons, the CRL MUST include revocations
 * for all reasons. If the distributionPoint omits cRLIssuer, the CRL
 * MUST be issued by the CA that issued the certificate.
 * <p>
 * The ASN.1 definition for this is:
 * <pre>
 * id-ce-cRLDistributionPoints OBJECT IDENTIFIER ::=  { id-ce 31 }
 *
 * cRLDistributionPoints ::= {
 *      CRLDistPointsSyntax }
 *
 * CRLDistPointsSyntax ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
 * </pre>
 * <p>
 * @author Anne Anderson
 * @author Andreas Sterbenz
 * @since 1.4.2
 * @see DistributionPoint
 * @see Extension
 * @see CertAttrSet
 */
public class CRLDistributionPointsExtension 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.CRLDistributionPoints";

    /**
     * Attribute name.
     */
    public static final String NAME = "CRLDistributionPoints";
    public static final String POINTS = "points";

    /**
     * The List of DistributionPoint objects.
     */
    private List<DistributionPoint> distributionPoints;

    private String extensionName;

    /**
     * Create a CRLDistributionPointsExtension from a List of
     * DistributionPoint; the criticality is set to false.
     *
     * @param distributionPoints the list of distribution points
     * @throws IOException on error
     */
    public CRLDistributionPointsExtension(
        List<DistributionPoint> distributionPoints) throws IOException {

        this(false, distributionPoints);
    }

    /**
     * Create a CRLDistributionPointsExtension from a List of
     * DistributionPoint.
     *
     * @param isCritical the criticality setting.
     * @param distributionPoints the list of distribution points
     * @throws IOException on error
     */
    public CRLDistributionPointsExtension(boolean isCritical,
        List<DistributionPoint> distributionPoints) throws IOException {

        this(PKIXExtensions.CRLDistributionPoints_Id, isCritical,
            distributionPoints, NAME);
    }

    /**
     * Creates the extension (also called by the subclass).
     */
    protected CRLDistributionPointsExtension(ObjectIdentifier extensionId,
        boolean isCritical, List<DistributionPoint> distributionPoints,
            String extensionName) throws IOException {

        this.extensionId = extensionId;
        this.critical = isCritical;
        this.distributionPoints = distributionPoints;
        encodeThis();
        this.extensionName = extensionName;
    }

    /**
     * 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 CRLDistributionPointsExtension(Boolean critical, Object value)
            throws IOException {
        this(PKIXExtensions.CRLDistributionPoints_Id, critical, value, NAME);
    }

    /**
     * Creates the extension (also called by the subclass).
     */
    protected CRLDistributionPointsExtension(ObjectIdentifier extensionId,
        Boolean critical, Object value, String extensionName)
            throws IOException {

        this.extensionId = extensionId;
        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 " + extensionName +
                                  " extension.");
        }
        distributionPoints = new ArrayList<DistributionPoint>();
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            DistributionPoint point = new DistributionPoint(seq);
            distributionPoints.add(point);
        }
        this.extensionName = extensionName;
    }

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

    /**
     * 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 {
        encode(out, PKIXExtensions.CRLDistributionPoints_Id, false);
    }

    /**
     * Write the extension to the DerOutputStream.
     * (Also called by the subclass)
     */
    protected void encode(OutputStream out, ObjectIdentifier extensionId,
        boolean isCritical) throws IOException {

        DerOutputStream tmp = new DerOutputStream();
        if (this.extensionValue == null) {
            this.extensionId = extensionId;
            this.critical = isCritical;
            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(POINTS)) {
            if (!(obj instanceof List)) {
                throw new IOException("Attribute value should be of type List.");
            }
            distributionPoints = (List<DistributionPoint>)obj;
        } else {
            throw new IOException("Attribute name [" + name +
                                "] not recognized by " +
                                "CertAttrSet:" + extensionName + ".");
        }
        encodeThis();
    }

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

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

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

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

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

}

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