/* X509CRLEntry.java -- an entry in a X.509 CRL.
   Copyright (C) 2003, 2004  Free Software Foundation, Inc.

This file is part of GNU Crypto.

GNU Crypto is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

GNU Crypto 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 GNU Crypto; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */


package gnu.crypto.pki;

import java.io.InputStream;
import java.io.IOException;

import java.math.BigInteger;

import java.security.cert.CRLException;
import java.security.cert.X509CRLEntry;

import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

import gnu.crypto.der.*;
import gnu.crypto.pki.ext.*;

/**
 * A single entry in a X.509 certificate revocation list.
 *
 * @see X509CRL
 * @author Casey Marshall
 */
class X509CRLEntryImpl extends X509CRLEntry implements GnuPKIExtension
{

  // Constants and fields.
  // ------------------------------------------------------------------------

  private static final boolean DEBUG = false;
  private static void debug(String msg)
  {
    if (DEBUG)
      {
        System.err.print(">> X509CRLEntryImpl: ");
        System.err.println(msg);
      }
  }

  /** The DER encoded form of this CRL entry. */
  private byte[] encoded;

  /** The revoked certificate's serial number. */
  private BigInteger serialNo;

  /** The date the certificate was revoked. */
  private Date revocationDate;

  /** The CRL entry extensions. */
  private HashMap extensions;

  // Constructor.
  // ------------------------------------------------------------------------

  /**
   * Create a new X.509 certificate revocation list entry from the given
   * input stream and CRL version number.
   *
   * @param version The CRL version.
   * @param encoded The stream of DER bytes.
   * @throws CRLException If the ASN.1 structure is invalid.
   * @throws IOException  If the bytes cannot be read.
   */
  X509CRLEntryImpl(int version, DERReader encoded)
    throws CRLException, IOException
  {
    super();
    extensions = new HashMap();
    try
      {
        parse(version, encoded);
      }
    catch (IOException ioe)
      {
        throw ioe;
      }
    catch (Exception x)
      {
        throw new CRLException(x.toString());
      }
  }

  // X509CRLEntry methods.
  // ------------------------------------------------------------------------

  public boolean equals(Object o)
  {
    if (!(o instanceof X509CRLEntry))
      return false;
    return ((X509CRLEntry) o).getSerialNumber().equals(serialNo) &&
           ((X509CRLEntry) o).getRevocationDate().equals(revocationDate);
  }

  public int hashCode()
  {
    return serialNo.hashCode();
  }

  public byte[] getEncoded() throws CRLException
  {
    return (byte[]) encoded.clone();
  }

  public BigInteger getSerialNumber()
  {
    return serialNo;
  }

  public Date getRevocationDate()
  {
    return (Date) revocationDate.clone();
  }

  public boolean hasExtensions()
  {
    return ! extensions.isEmpty();
  }

  public String toString()
  {
    return "X509CRLEntry serial=" + serialNo + " revocation date="
      + revocationDate + " ext=" + extensions;
  }

  // X509Extension methods.
  // -------------------------------------------------------------------------

  public boolean hasUnsupportedCriticalExtension()
  {
    for (Iterator it = extensions.values().iterator(); it.hasNext(); )
      {
        Extension e = (Extension) it.next();
        if (e.isCritical() && !e.isSupported())
          return true;
      }
    return false;
  }

  public Set getCriticalExtensionOIDs()
  {
    HashSet s = new HashSet();
    for (Iterator it = extensions.values().iterator(); it.hasNext(); )
      {
        Extension e = (Extension) it.next();
        if (e.isCritical())
          s.add(e.getOid().toString());
      }
    return Collections.unmodifiableSet(s);
  }

  public Set getNonCriticalExtensionOIDs()
  {
    HashSet s = new HashSet();
    for (Iterator it = extensions.values().iterator(); it.hasNext(); )
      {
        Extension e = (Extension) it.next();
        if (!e.isCritical())
          s.add(e.getOid().toString());
      }
    return Collections.unmodifiableSet(s);
  }

  public byte[] getExtensionValue(String oid)
  {
    Extension e = getExtension(new OID(oid));
    if (e != null)
      {
        return e.getValue().getEncoded();
      }
    return null;
  }

  // GnuPKIExtension method.
  // -------------------------------------------------------------------------

  public Extension getExtension(OID oid)
  {
    return (Extension) extensions.get(oid);
  }

  public Collection getExtensions()
  {
    return extensions.values();
  }

  // Own methods.
  // -------------------------------------------------------------------------

  private void parse(int version, DERReader der) throws Exception
  {
    // RevokedCertificate ::= SEQUENCE {
    DERValue entry = der.read();
    debug("start CRL entry   len == " + entry.getLength());
    if (!entry.isConstructed())
      throw new IOException("malformed revokedCertificate");
    encoded = entry.getEncoded();
    int len = 0;

    debug("encoded entry:\n" + Util.hexDump(encoded, ">>>> "));

    //   userCertificate   CertificateSerialNumber,
    DERValue val = der.read();
    serialNo = (BigInteger) val.getValue();
    len += val.getEncodedLength();
    debug("userCertificate == " + serialNo + "  current count == " + len);

    //   revocationDate   Time,
    val = der.read();
    revocationDate = (Date) val.getValue();
    len += val.getEncodedLength();
    debug("revocationDate == " + revocationDate + "  current count == " + len);

    //   crlEntryExtensions   Extensions OPTIONAL
    //                          -- if present MUST be v2
    if (len < entry.getLength())
      {
        if (version < 2)
          throw new IOException("extra data in CRL entry");
        DERValue exts = der.read();
        if (!exts.isConstructed())
          throw new IOException("malformed Extensions");
        debug("start Extensions  len == " + exts.getLength());
        len = 0;
        while (len < exts.getLength())
          {
            val = der.read();
            if (!val.isConstructed())
              throw new IOException("malformed Extension");
            debug("start Extension  len == " + val.getLength());
            Extension e = new Extension(val.getEncoded());
            extensions.put(e.getOid(), e);
            der.skip(val.getLength());
            len += val.getEncodedLength();
            debug("current count == " + len);
          }
      }
  }
}
