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/*
 * Copyright (C) 2016 Original Authors
 *
 * 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 io.fabric8.docker.client.utils;

import okio.ByteString;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.KeyFactory;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.RSAPrivateCrtKeySpec;

public class CertUtils {

  public static InputStream getInputStreamFromDataOrFile(String data, String file) throws FileNotFoundException {
    if (data != null) {
      byte[] bytes = null;
      ByteString decoded = ByteString.decodeBase64(data);
      if (decoded != null) {
          bytes = decoded.toByteArray();
      } else {
          bytes = data.getBytes();
      }

      return new ByteArrayInputStream(bytes);
    }
    if (file != null) {
      return new FileInputStream(file);
    }
    return null;
  }

  public static KeyStore createTrustStore(String caCertData, String caCertFile) throws IOException, CertificateException, KeyStoreException, NoSuchAlgorithmException {
    try (InputStream pemInputStream = getInputStreamFromDataOrFile(caCertData, caCertFile)) {
      return createTrustStore(pemInputStream);
    }
  }

  public static KeyStore createTrustStore(InputStream pemInputStream) throws IOException, CertificateException, KeyStoreException, NoSuchAlgorithmException {
      CertificateFactory certFactory = CertificateFactory.getInstance("X509");
      X509Certificate cert = (X509Certificate) certFactory.generateCertificate(pemInputStream);

      KeyStore trustStore = KeyStore.getInstance("JKS");
      trustStore.load(null);

      String alias = cert.getSubjectX500Principal().getName();
      trustStore.setCertificateEntry(alias, cert);
      return trustStore;
  }


  public static KeyStore createKeyStore(InputStream certInputStream, InputStream keyInputStream, String clientKeyAlgo, char[] clientKeyPassphrase) throws IOException, CertificateException, NoSuchAlgorithmException, InvalidKeySpecException, KeyStoreException {
      CertificateFactory certFactory = CertificateFactory.getInstance("X509");
      X509Certificate cert = (X509Certificate) certFactory.generateCertificate(certInputStream);

      byte[] keyBytes = decodePem(keyInputStream);

      PrivateKey privateKey;

      KeyFactory keyFactory = KeyFactory.getInstance(clientKeyAlgo);
      try {
        // First let's try PKCS8
        privateKey = keyFactory.generatePrivate(new PKCS8EncodedKeySpec(keyBytes));
      } catch (InvalidKeySpecException e) {
        // Otherwise try PKCS8
        RSAPrivateCrtKeySpec keySpec = PKCS1Util.decodePKCS1(keyBytes);
        privateKey = keyFactory.generatePrivate(keySpec);
      }

      KeyStore keyStore = KeyStore.getInstance("JKS");
      keyStore.load(null, clientKeyPassphrase);

      String alias = cert.getSubjectX500Principal().getName();
      keyStore.setKeyEntry(alias, privateKey, clientKeyPassphrase, new Certificate[]{cert});

      return keyStore;
  }

  public static KeyStore createKeyStore(String clientCertData, String clientCertFile, String clientKeyData, String clientKeyFile, String clientKeyAlgo, char[] clientKeyPassphrase) throws IOException, CertificateException, NoSuchAlgorithmException, InvalidKeySpecException, KeyStoreException {
    try (InputStream certInputStream = getInputStreamFromDataOrFile(clientCertData, clientCertFile); InputStream keyInputStream = getInputStreamFromDataOrFile(clientKeyData, clientKeyFile)) {
      return createKeyStore(certInputStream, keyInputStream, clientKeyAlgo, clientKeyPassphrase);
    }
  }

  // This method is inspired and partly taken over from
  // http://oauth.googlecode.com/svn/code/java/
  // All credits to belong to them.
  private static byte[] decodePem(InputStream keyInputStream) throws IOException {
    BufferedReader reader = new BufferedReader(new InputStreamReader(keyInputStream));
    try {
      String line;
      while ((line = reader.readLine()) != null) {
        if (line.contains("-----BEGIN ")) {
          return readBytes(reader, line.trim().replace("BEGIN", "END"));
        }
      }
      throw new IOException("PEM is invalid: no begin marker");
    } finally {
      reader.close();
    }
  }

  private static byte[] readBytes(BufferedReader reader, String endMarker) throws IOException {
    String line;
    StringBuffer buf = new StringBuffer();

    while ((line = reader.readLine()) != null) {
      if (line.indexOf(endMarker) != -1) {
        return ByteString.decodeBase64(buf.toString()).toByteArray();
      }
      buf.append(line.trim());
    }
    throw new IOException("PEM is invalid : No end marker");
  }
}