package gnu.crypto.keyring;  // -*- c-basic-offset: 3 -*-

// ---------------------------------------------------------------------------
// $Id: GnuPublicKeyring.java,v 1.7 2005/10/06 04:24:16 rsdio Exp $
//
// Copyright (C) 2003 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 this program; 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.
//
// ---------------------------------------------------------------------------

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

import java.util.Date;
import java.util.Iterator;
import java.util.List;

import java.security.cert.Certificate;

import gnu.crypto.Registry;

public class GnuPublicKeyring extends BaseKeyring implements IPublicKeyring {

   // Fields.
   // ------------------------------------------------------------------------

   public static final int USAGE = Registry.GKR_CERTIFICATES;

   // Constructors.
   // ------------------------------------------------------------------------

   public GnuPublicKeyring(String mac, int macLen) {
      keyring = new PasswordAuthenticatedEntry(mac, macLen, new Properties());
      keyring2 = new CompressedEntry(new Properties());
      keyring.add(keyring2);
   }

   public GnuPublicKeyring() {
   }

   // Instance methods.
   // ------------------------------------------------------------------------

   public boolean containsCertificate(String alias) {
      if (!containsAlias(alias)) {
         return false;
      }
      List l = get(alias);
      for (Iterator it = l.iterator(); it.hasNext(); ) {
         if (it.next() instanceof CertificateEntry) {
            return true;
         }
      }
      return false;
   }

   public Certificate getCertificate(String alias) {
      if (!containsAlias(alias)) {
         return null;
      }
      List l = get(alias);
      for (Iterator it = l.iterator(); it.hasNext(); ) {
         Entry e = (Entry) it.next();
         if (e instanceof CertificateEntry) {
            return ((CertificateEntry) e).getCertificate();
         }
      }
      return null;
   }

   public void putCertificate(String alias, Certificate cert) {
      if (containsCertificate(alias)) {
         return;
      }
      Properties p = new Properties();
      p.put("alias", fixAlias(alias));
      add(new CertificateEntry(cert, new Date(), p));
   }

   protected void load(InputStream in, char[] password) throws IOException {
      if (in.read() != USAGE) {
         throw new MalformedKeyringException("incompatible keyring usage");
      }
      if (in.read() != PasswordAuthenticatedEntry.TYPE) {
         throw new MalformedKeyringException("expecting password-authenticated entry tag");
      }
      keyring = PasswordAuthenticatedEntry.decode(new DataInputStream(in),
                                                  password);
   }

   protected void store(OutputStream out, char[] password) throws IOException {
      out.write(USAGE);
      keyring.encode(new DataOutputStream(out), password);
   }
}