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The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. This package contains the Standard Edition of the LDAP SDK, which is a complete, general-purpose library for communicating with LDAPv3 directory servers.
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/*
 * Copyright 2017-2018 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2017-2018 Ping Identity Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see .
 */
package com.unboundid.util.ssl.cert;



import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import com.unboundid.asn1.ASN1Element;
import com.unboundid.asn1.ASN1ObjectIdentifier;
import com.unboundid.asn1.ASN1Sequence;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.OID;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;

import static com.unboundid.util.ssl.cert.CertMessages.*;



/**
 * This class provides an implementation of the extended key usage X.509
 * certificate extension as described in
 * RFC 5280 section 4.2.1.12.
 * This can be used to provide an extensible list of OIDs that identify ways
 * that a certificate is intended to be used.
 * 


 * The OID for this extension is 2.5.29.37 and the value has the following
 * encoding:
 *  *   ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
 *
 *   KeyPurposeId ::= OBJECT IDENTIFIER
 * 
 *
 * @see  ExtendedKeyUsageID
 */
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ExtendedKeyUsageExtension
       extends X509CertificateExtension
{
  /**
   * The OID (2.5.29.37) for extended key usage extensions.
   */
  public static final OID EXTENDED_KEY_USAGE_OID = new OID("2.5.29.37");



  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = -8208115548961483723L;



  // The set of key purpose IDs included in this extension.
  private final Set keyPurposeIDs;



  /**
   * Creates a new extended key usage extension with the provided set of key
   * purpose IDs.
   *
   * @param  isCritical     Indicates whether this extension should be
   *                        considered critical.
   * @param  keyPurposeIDs  The set of key purpose IDs included in this
   *                        extension.  It must not be {@code null}.
   *
   * @throws  CertException  If a problem is encountered while encoding the
   *                         value for this extension.
   */
  ExtendedKeyUsageExtension(final boolean isCritical,
                            final List keyPurposeIDs)
       throws CertException
  {
    super(EXTENDED_KEY_USAGE_OID, isCritical, encodeValue(keyPurposeIDs));

    this.keyPurposeIDs =
         Collections.unmodifiableSet(new LinkedHashSet<>(keyPurposeIDs));
  }



  /**
   * Creates a new extended key usage extension from the provided generic
   * extension.
   *
   * @param  extension  The extension to decode as an extended key usage
   *                    extension.
   *
   * @throws  CertException  If the provided extension cannot be decoded as an
   *                         extended key usage extension.
   */
  ExtendedKeyUsageExtension(final X509CertificateExtension extension)
       throws CertException
  {
    super(extension);

    try
    {
      final ASN1Element[] elements =
           ASN1Sequence.decodeAsSequence(extension.getValue()).elements();
      final LinkedHashSet ids =
           new LinkedHashSet<>(StaticUtils.computeMapCapacity(elements.length));
      for (final ASN1Element e : elements)
      {
        ids.add(e.decodeAsObjectIdentifier().getOID());
      }

      keyPurposeIDs = Collections.unmodifiableSet(ids);
    }
    catch (final Exception e)
    {
      Debug.debugException(e);
      throw new CertException(
           ERR_EXTENDED_KEY_USAGE_EXTENSION_CANNOT_PARSE.get(
                String.valueOf(extension), StaticUtils.getExceptionMessage(e)),
           e);
    }
  }



  /**
   * Encodes the provided information for use as the value of this extension.
   *
   * @param  keyPurposeIDs  The set of key purpose IDs included in this
   *                        extension.  It must not be {@code null}.
   *
   * @return  The encoded value for this extension.
   *
   * @throws  CertException  If a problem is encountered while encoding the
   *                         value.
   */
  private static byte[] encodeValue(final List keyPurposeIDs)
          throws CertException
  {
    try
    {
      final ArrayList elements =
           new ArrayList<>(keyPurposeIDs.size());
      for (final OID oid : keyPurposeIDs)
      {
        elements.add(new ASN1ObjectIdentifier(oid));
      }

      return new ASN1Sequence(elements).encode();
    }
    catch (final Exception e)
    {
      Debug.debugException(e);
      throw new CertException(
           ERR_EXTENDED_KEY_USAGE_EXTENSION_CANNOT_ENCODE.get(
                String.valueOf(keyPurposeIDs),
                StaticUtils.getExceptionMessage(e)),
           e);
    }
  }



  /**
   * Retrieves the OIDs of the key purpose values contained in this extension.
   * Some, all, or none of the OIDs contained in this extension may correspond
   * to values in the {@link ExtendedKeyUsageID} enumeration.
   *
   * @return  The OIDs of the key purpose values contained in this extension.
   */
  public Set getKeyPurposeIDs()
  {
    return keyPurposeIDs;
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  public String getExtensionName()
  {
    return INFO_EXTENDED_KEY_USAGE_EXTENSION_NAME.get();
  }



  /**
   * {@inheritDoc}
   */
  @Override()
  public void toString(final StringBuilder buffer)
  {
    buffer.append("ExtendedKeyUsageExtension(oid='");
    buffer.append(getOID());
    buffer.append("', isCritical=");
    buffer.append(isCritical());
    buffer.append(", keyPurposeIDs={");

    final Iterator oidIterator = keyPurposeIDs.iterator();
    while (oidIterator.hasNext())
    {
      buffer.append('\'');
      buffer.append(ExtendedKeyUsageID.getNameOrOID(oidIterator.next()));
      buffer.append('\'');

      if (oidIterator.hasNext())
      {
        buffer.append(", ");
      }
    }

    buffer.append("})");
  }
}