code: /*
   * 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.skywalking.oap.server.library.server.grpc.ssl;
  
  import io.grpc.netty.GrpcSslContexts;
  import io.netty.handler.ssl.ClientAuth;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.SslProvider;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Paths;
  import javax.net.ssl.SSLException;
  import org.apache.skywalking.oap.server.library.util.StringUtil;
  import org.apache.skywalking.oap.server.library.server.ssl.AbstractSslContext;
  import org.apache.skywalking.oap.server.library.server.ssl.PrivateKeyUtil;
  
  /**
   * Load SslContext dynamically.
   */
  public class DynamicSslContext extends AbstractSslContext {
  
      public static DynamicSslContext forServer(final String privateKeyFile,
                                                final String certChainFile,
                                                final String trustedCAsFile) {
          return new DynamicSslContext(privateKeyFile, certChainFile, trustedCAsFile);
      }
  
      public static DynamicSslContext forClient(final String caFile) {
          return new DynamicSslContext(caFile);
      }
  
      protected DynamicSslContext(String privateKeyFile, String certChainFile, String trustedCAsFile) {
          super(privateKeyFile, certChainFile, trustedCAsFile);
      }
  
      protected DynamicSslContext(String caFile) {
          super(caFile);
      }
  
      @Override
      protected void updateContext(String caFile) {
          try {
              setCtx(GrpcSslContexts.forClient().trustManager(Paths.get(caFile).toFile()).build());
          } catch (SSLException e) {
              throw new IllegalArgumentException(e);
          }
      }
  
      protected void updateContext(final String privateKeyFile, final String certChainFile, final String trustedCAsFile) {
          try (InputStream cert = new FileInputStream(Paths.get(certChainFile).toFile());
               InputStream key = PrivateKeyUtil.loadDecryptionKey(privateKeyFile)) {
  
              SslContextBuilder builder = GrpcSslContexts.configure(
                  SslContextBuilder.forServer(cert, key),
                  SslProvider.OPENSSL
              );
  
              if (StringUtil.isNotEmpty(trustedCAsFile)) {
                  builder.trustManager(Paths.get(trustedCAsFile).toFile())
                         .clientAuth(ClientAuth.REQUIRE);
              }
  
              setCtx(builder.build());
          } catch (IOException e) {
              throw new IllegalArgumentException(e);
          }
      }
  
  }
  