content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.celeborn.common.network.ssl;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.security.*;
  import java.security.cert.CertificateException;
  import java.security.cert.X509Certificate;
  import java.util.UUID;
  
  import io.netty.handler.ssl.util.SelfSignedCertificate;
  
  /** SSL util functions for use with SSLFactory */
  class SSLUtils {
  
    static final String KEY_PAIR_ALGORITHM =
        System.getProperty("celeborn.SSLUtils.KEY_PAIR_ALGORITHM", "RSA");
    static final int KEY_PAIR_STRENGTH =
        Integer.getInteger("celeborn.SSLUtils.KEY_PAIR_STRENGTH", 2048);
    static final long CERTIFICATE_VALIDITY =
        // default, 1 year validity
        Long.getLong("celeborn.SSLUtils.CERTIFICATE_VALIDITY_DAYS", 365) * 24 * 60 * 60 * 1000;
  
    static class SelfSignedCertificateConfig {
      final File keystoreFile;
      final String alias;
      final String keystorePassword;
      final String keyPassword;
  
      SelfSignedCertificateConfig() throws IOException {
        this(
            createTempJksFile(),
            UUID.randomUUID().toString(),
            UUID.randomUUID().toString(),
            UUID.randomUUID().toString());
      }
  
      SelfSignedCertificateConfig(
          File keystoreFile, String alias, String keystorePassword, String keyPassword) {
        this.keystoreFile = keystoreFile;
        this.alias = alias;
        this.keystorePassword = keystorePassword;
        this.keyPassword = keyPassword;
      }
  
      private static File createTempJksFile() throws IOException {
        File keystoreFile = File.createTempFile("auto-ssl-", ".jks");
        keystoreFile.deleteOnExit();
        return keystoreFile;
      }
    }
  
    static void generateSelfSignedCertificate(SelfSignedCertificateConfig config)
        throws IOException, CertificateException, KeyStoreException, NoSuchAlgorithmException {
      SelfSignedCertificate cert = new SelfSignedCertificate();
      PrivateKey privateKey = cert.key();
      X509Certificate certificate = cert.cert();
  
      // Create a KeyStore
      KeyStore keyStore = KeyStore.getInstance("JKS");
      keyStore.load(null, null); // Initialize empty keystore
  
      keyStore.setKeyEntry(
          config.alias,
          privateKey,
          config.keyPassword.toCharArray(),
          new X509Certificate[] {certificate});
  
      // Save the keystore
      try (FileOutputStream outputStream = new FileOutputStream(config.keystoreFile)) {
        keyStore.store(outputStream, config.keystorePassword.toCharArray());
      }
    }
  }
  