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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security;

import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequestBuilder;
import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;

import javax.security.auth.x500.X500Principal;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.security.KeyPair;
import java.util.ArrayList;
import java.util.List;

import static com.yahoo.security.SubjectAlternativeName.Type.DNS_NAME;

/**
 * @author bjorncs
 */
public class Pkcs10CsrBuilder {

    private final X500Principal subject;
    private final KeyPair keyPair;
    private final List subjectAlternativeNames = new ArrayList<>();
    private final SignatureAlgorithm signatureAlgorithm;
    private BasicConstraintsExtension basicConstraintsExtension;

    private Pkcs10CsrBuilder(X500Principal subject,
                             KeyPair keyPair,
                             SignatureAlgorithm signatureAlgorithm) {
        this.subject = subject;
        this.keyPair = keyPair;
        this.signatureAlgorithm = signatureAlgorithm;
    }

    public static Pkcs10CsrBuilder fromKeypair(X500Principal subject,
                                               KeyPair keyPair,
                                               SignatureAlgorithm signatureAlgorithm) {
        return new Pkcs10CsrBuilder(subject, keyPair, signatureAlgorithm);
    }

    public Pkcs10CsrBuilder addSubjectAlternativeName(String dns) {
        this.subjectAlternativeNames.add(new SubjectAlternativeName(DNS_NAME, dns));
        return this;
    }

    public Pkcs10CsrBuilder addSubjectAlternativeName(SubjectAlternativeName san) {
        this.subjectAlternativeNames.add(san);
        return this;
    }

    public Pkcs10CsrBuilder addSubjectAlternativeName(SubjectAlternativeName.Type type, String value) {
        this.subjectAlternativeNames.add(new SubjectAlternativeName(type, value));
        return this;
    }

    public Pkcs10CsrBuilder setBasicConstraints(boolean isCritical, boolean isCertAuthorityCertificate) {
        this.basicConstraintsExtension = new BasicConstraintsExtension(isCritical, isCertAuthorityCertificate);
        return this;
    }

    public Pkcs10CsrBuilder setIsCertAuthority(boolean isCertAuthority) {
        return setBasicConstraints(true, isCertAuthority);
    }

    public Pkcs10Csr build() {
        try {
            PKCS10CertificationRequestBuilder requestBuilder =
                    new JcaPKCS10CertificationRequestBuilder(new X500Name(subject.getName()), keyPair.getPublic());
            ExtensionsGenerator extGen = new ExtensionsGenerator();
            if (basicConstraintsExtension != null) {
                extGen.addExtension(
                        Extension.basicConstraints,
                        basicConstraintsExtension.isCritical,
                        new BasicConstraints(basicConstraintsExtension.isCertAuthorityCertificate));
            }
            if (!subjectAlternativeNames.isEmpty()) {
                GeneralNames generalNames = new GeneralNames(
                        subjectAlternativeNames.stream()
                                .map(SubjectAlternativeName::toGeneralName)
                                .toArray(GeneralName[]::new));
                extGen.addExtension(Extension.subjectAlternativeName, false, generalNames);
            }
            requestBuilder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, extGen.generate());
            ContentSigner contentSigner = new JcaContentSignerBuilder(signatureAlgorithm.getAlgorithmName())
                    .setProvider(BouncyCastleProviderHolder.getInstance())
                    .build(keyPair.getPrivate());
            return new Pkcs10Csr(requestBuilder.build(contentSigner));
        } catch (OperatorCreationException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }

    }

}