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/*
 *********************************************************************************
 *     Cloud Foundry
 *     Copyright (c) [2009-2016] Pivotal Software, Inc. All Rights Reserved.
 *
 *     This product is licensed to you under the Apache License, Version 2.0 (the "License").
 *     You may not use this product except in compliance with the License.
 *
 *     This product includes a number of subcomponents with
 *     separate copyright notices and license terms. Your use of these
 *     subcomponents is subject to the terms and conditions of the
 *     subcomponent's license, as noted in the LICENSE file.
 *******************************************************************************/
package org.cloudfoundry.identity.uaa.util;

import org.bouncycastle.asn1.x500.X500NameBuilder;
import org.bouncycastle.asn1.x500.style.BCStyle;
import org.bouncycastle.cert.X509v3CertificateBuilder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.cert.jcajce.JcaX509v3CertificateBuilder;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.joda.time.DateTime;

import java.math.BigInteger;
import java.security.*;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Date;


public class SocketUtils {
    private static final String BC = org.bouncycastle.jce.provider.BouncyCastleProvider.PROVIDER_NAME;

    public static X509Certificate getSelfCertificate(KeyPair keyPair, String organisation, String orgUnit, String commonName, Date issueDate,
                                                     long validForSeconds,
                                                     String signatureAlgorithm)
            throws CertificateException, InvalidKeyException, SignatureException, NoSuchAlgorithmException, NoSuchProviderException {
        try {
            Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

            X500NameBuilder builder = new X500NameBuilder(BCStyle.INSTANCE);
            builder.addRDN(BCStyle.OU, orgUnit);
            builder.addRDN(BCStyle.O, organisation);
            builder.addRDN(BCStyle.CN, commonName);


            BigInteger serial = BigInteger.valueOf(System.currentTimeMillis());

            Date notAfter = new DateTime(issueDate).plusSeconds((int) validForSeconds).toDate();
            X509v3CertificateBuilder certGen = new JcaX509v3CertificateBuilder(builder.build(),
                    serial, issueDate, notAfter, builder.build(), keyPair.getPublic());
            ContentSigner sigGen = new JcaContentSignerBuilder(signatureAlgorithm)
                    .setProvider(BC).build(keyPair.getPrivate());
            X509Certificate cert = new JcaX509CertificateConverter().setProvider(BC)
                    .getCertificate(certGen.build(sigGen));
            cert.checkValidity(new Date());
            cert.verify(cert.getPublicKey());

            return cert;
        } catch (OperatorCreationException ioe) {
            throw new CertificateEncodingException("Error during creation of self-signed Certificate: " + ioe.getMessage(), ioe);
        }
    }
}