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   /*
    * Copyright 2022 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.netty.example.util;
  
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.SelfSignedCertificate;
  
  import javax.net.ssl.SSLException;
  import java.security.cert.CertificateException;
  
  /**
   * Some useful methods for server side.
   */
  public final class ServerUtil {
  
      private static final boolean SSL = System.getProperty("ssl") != null;
  
      private ServerUtil() {
      }
  
      public static SslContext buildSslContext() throws CertificateException, SSLException {
          if (!SSL) {
              return null;
          }
          SelfSignedCertificate ssc = new SelfSignedCertificate();
          return SslContextBuilder
                  .forServer(ssc.certificate(), ssc.privateKey())
                  .build();
      }
  }