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/*
 * ==========================================================================
 * Copyright (C) 2019-2022 HCL America, Inc. ( http://www.hcl.com/ )
 *                            All rights reserved.
 * ==========================================================================
 * 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 .
 *
 * 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.hcl.domino.jnx.console.internal;

import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.security.KeyStore;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManagerFactory;

/**
 * Loads the Java keystore with the certificate to connect to the SSL server
 * controller socket.
 */
class SSL {
  private static SSLContext sslctx = null;
  private static Class parentClass;

  private static void checkStrongCiphersAvailable() {
    int n = 0;
    try {
      final Cipher cipher = Cipher.getInstance("AES");
      n = Cipher.getMaxAllowedKeyLength("AES");
    } catch (final Exception e) {
      throw new RuntimeException("Error checking for required JVM ciphers", e);
    }

    if (n < 256) {
      throw new RuntimeException("WARNING: Attempting to use AES_256, but the JVM only supports a maximum key length of " + n
          + ". The JVM should be upgraded to use the JCE unlimited strength jars.");
    }
  }

  public static SSLSocket getClientSocket(final String host, final int port, final InetAddress localHost, final int localPort)
      throws IOException {
    SSL.initSSLContext();

    final SSLSocketFactory sSLSocketFactory = SSL.sslctx.getSocketFactory();
    SSLSocket sSLSocket = null;
    try {
      sSLSocket = (SSLSocket) sSLSocketFactory.createSocket(host, port, localHost, localPort);
      sSLSocket.startHandshake();
    } catch (final IOException iOException) {
      iOException.printStackTrace();
      if (sSLSocket != null) {
        try {
          sSLSocket.close();
        } catch (final IOException iOException1) {
        }
      }
      sSLSocket = null;
      throw iOException;
    }
    return sSLSocket;
  }

  private static synchronized void initSSLContext() {
    if (SSL.sslctx != null) {
      return;
    }

    SSL.checkStrongCiphersAvailable();

    try {
      final char[] arrc = "andhrawalabrave<3".toCharArray();

      final String resourcePath = "/" + DominoConsoleRunner.class.getPackage().getName().replace('.', '/') + "/jconsole.jks";

      final KeyStore keyStore = KeyStore.getInstance("jks");
      final InputStream in = SSL.parentClass.getResourceAsStream(resourcePath);
      if (in == null) {
        throw new RuntimeException("Required file " + resourcePath + " not found");
      }

      keyStore.load(in, arrc);

      // FIXED: Added fallback to SunX509, code did not work when usin OpenJ9
      KeyManagerFactory keyManagerFactory;
      try {
        keyManagerFactory = KeyManagerFactory.getInstance("IbmX509");
      } catch (final NoSuchAlgorithmException e2) {
        keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
      }
      keyManagerFactory.init(keyStore, arrc);

      TrustManagerFactory trustManagerFactory;
      try {
        trustManagerFactory = TrustManagerFactory.getInstance("IbmX509");
      } catch (final NoSuchAlgorithmException e2) {
        trustManagerFactory = TrustManagerFactory.getInstance("SunX509");
      }
      trustManagerFactory.init(keyStore);
      SSL.sslctx = SSLContext.getInstance("TLS");
      SSL.sslctx.init(keyManagerFactory.getKeyManagers(), trustManagerFactory.getTrustManagers(), null);
    } catch (final Exception e) {
      throw new RuntimeException("Error initializing SSL context to access Domino console", e);
    }
  }

  public static void setClassLoader(final Class class_) {
    SSL.parentClass = class_;
  }

  private SSL() {
  }
}