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/*
 * Copyright (C) 2020-2021 Thomas Akehurst
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.tomakehurst.wiremock.http.ssl;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;
import static java.util.Arrays.stream;
import static java.util.Objects.requireNonNull;

import java.security.*;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.Collections;
import java.util.List;

/** Wrapper class to make it easy to retrieve X509 PrivateKey and certificate chains */
public class X509KeyStore {

  private final KeyStore keyStore;
  private final char[] password;
  private final List aliases;

  /**
   * @param keyStore {@link KeyStore} to delegate to
   * @param password used to manage all keys stored in this key store
   * @throws KeyStoreException if the keystore has not been loaded
   */
  public X509KeyStore(KeyStore keyStore, char[] password) throws KeyStoreException {
    this.keyStore = requireNonNull(keyStore);
    this.password = requireNonNull(password);
    this.aliases = Collections.list(keyStore.aliases());
  }

  PrivateKey getPrivateKey(String alias) {
    try {
      Key key = keyStore.getKey(alias, password);
      if (key instanceof PrivateKey) {
        return (PrivateKey) key;
      } else {
        return null;
      }
    } catch (NoSuchAlgorithmException | UnrecoverableKeyException e) {
      return null;
    } catch (KeyStoreException e) {
      // impossible, class could not have been constructed
      return throwUnchecked(e, null);
    }
  }

  X509Certificate[] getCertificateChain(String alias) {
    try {
      Certificate[] fromKeyStore = keyStore.getCertificateChain(alias);
      if (fromKeyStore != null && areX509Certificates(fromKeyStore)) {
        return convertToX509(fromKeyStore);
      } else {
        return null;
      }
    } catch (KeyStoreException e) {
      return throwUnchecked(e, null);
    }
  }

  private static boolean areX509Certificates(Certificate[] fromKeyStore) {
    return fromKeyStore.length == 0 || fromKeyStore[0] instanceof X509Certificate;
  }

  private static X509Certificate[] convertToX509(Certificate[] fromKeyStore) {
    return stream(fromKeyStore).map(X509Certificate.class::cast).toArray(X509Certificate[]::new);
  }

  /**
   * @return the first key & chain that represent a certificate authority or null if none found
   */
  public CertificateAuthority getCertificateAuthority() {
    for (String alias : aliases) {
      X509Certificate[] chain = getCertificateChain(alias);
      PrivateKey key = getPrivateKey(alias);
      if (isCertificateAuthority(chain[0]) && key != null) {
        return new CertificateAuthority(chain, key);
      }
    }
    return null;
  }

  private static boolean isCertificateAuthority(X509Certificate certificate) {
    boolean[] keyUsage = certificate.getKeyUsage();
    return keyUsage != null && keyUsage.length > 5 && keyUsage[5];
  }

  void setKeyEntry(String alias, CertChainAndKey newCertChainAndKey) throws KeyStoreException {
    keyStore.setKeyEntry(
        alias, newCertChainAndKey.key, password, newCertChainAndKey.certificateChain);
  }
}