/*
 * DSS - Digital Signature Services
 *
 * Copyright (C) 2013 European Commission, Directorate-General Internal Market and Services (DG MARKT), B-1049 Bruxelles/Brussel
 *
 * Developed by: 2013 ARHS Developments S.A. (rue Nicolas Bové 2B, L-1253 Luxembourg) http://www.arhs-developments.com
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * "DSS - Digital Signature Services" is free software: you can redistribute it and/or modify it under the terms of
 * the GNU Lesser General Public License as published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * DSS 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * "DSS - Digital Signature Services".  If not, see <http://www.gnu.org/licenses/>.
 */

package eu.europa.ec.markt.dss.signature.token;

import java.security.KeyStore.PrivateKeyEntry;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.RSAPrivateKey;
import java.util.ArrayList;
import java.util.List;

import eu.europa.ec.markt.dss.EncryptionAlgorithm;
import eu.europa.ec.markt.dss.exception.DSSException;

/**
 * Wrapper of a PrivateKeyEntry coming from a KeyStore.
 *
 * @version $Revision$ - $Date$
 */
public class KSPrivateKeyEntry implements DSSPrivateKeyEntry {

    private final X509Certificate certificate;

    private final X509Certificate[] certificateChain;

    private final PrivateKey privateKey;

    /**
     * The default constructor for KSPrivateKeyEntry.
     */
    public KSPrivateKeyEntry(final PrivateKeyEntry privateKeyEntry) {

        certificate = (X509Certificate) privateKeyEntry.getCertificate();
        final List<X509Certificate> x509CertificateList = new ArrayList<X509Certificate>();
        final Certificate[] simpleCertificateChain = privateKeyEntry.getCertificateChain();
        for (final Certificate certificate : simpleCertificateChain) {

            x509CertificateList.add((X509Certificate) certificate);
        }
        final X509Certificate[] certificateChain_ = new X509Certificate[x509CertificateList.size()];
        certificateChain = x509CertificateList.toArray(certificateChain_);
        privateKey = privateKeyEntry.getPrivateKey();
    }

    @Override
    public X509Certificate getCertificate() {
        return certificate;
    }

    @Override
    public X509Certificate[] getCertificateChain() {
        return certificateChain;
    }

    /**
     * @return
     */
    public PrivateKey getPrivateKey() {
        return privateKey;
    }

    @Override
    public EncryptionAlgorithm getEncryptionAlgorithm() throws DSSException {

        if (privateKey instanceof RSAPrivateKey) {
            return EncryptionAlgorithm.RSA;
        } else if (privateKey instanceof DSAPrivateKey) {
            return EncryptionAlgorithm.DSA;
        } else if (privateKey instanceof ECPrivateKey) {
            return EncryptionAlgorithm.ECDSA;
        } else if (EncryptionAlgorithm.RSA.getName().equals(privateKey.getAlgorithm())) {
            return EncryptionAlgorithm.RSA;
        } else if (EncryptionAlgorithm.DSA.getName().equals(privateKey.getAlgorithm())) {
            return EncryptionAlgorithm.DSA;
        } else if (EncryptionAlgorithm.ECDSA.getName().equals(privateKey.getAlgorithm())) {
            return EncryptionAlgorithm.ECDSA;
        } else {
            throw new DSSException("Don't find algorithm for PrivateKey of type " + privateKey.getClass());
        }
    }
}