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.camel.quarkus.component.lumberjack.it;
  
  import java.io.ByteArrayOutputStream;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import javax.net.ssl.SSLEngine;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.ssl.SslHandler;
  import org.apache.camel.CamelContext;
  import org.apache.camel.support.jsse.KeyStoreParameters;
  import org.apache.camel.support.jsse.SSLContextParameters;
  import org.apache.camel.support.jsse.TrustManagersParameters;
  import org.mockito.Mockito;
  
  import static io.netty.buffer.Unpooled.wrappedBuffer;
  
  public class LumberjackClientUtil {
  
      /**
       * Send payload to Lumberjack server
       *
       * @param  port
       * @param  withSslContextParameters
       * @return
       * @throws InterruptedException
       */
      public static List<LumberjackAckResponse> sendMessages(int port, boolean withSslContextParameters)
              throws InterruptedException {
          final SSLContextParameters sslContextParameters = withSslContextParameters ? createClientSSLContextParameters() : null;
          NioEventLoopGroup eventLoopGroup = new NioEventLoopGroup();
          try {
              // This list will hold the acknowledgment response sequence numbers
              List<LumberjackAckResponse> responses = new ArrayList<>();
  
              // This initializer configures the SSL and an acknowledgment recorder
              ChannelInitializer<Channel> initializer = new ChannelInitializer<Channel>() {
                  @Override
                  protected void initChannel(Channel ch) throws Exception {
                      ChannelPipeline pipeline = ch.pipeline();
                      if (sslContextParameters != null) {
                          CamelContext mockContext = Mockito.mock(CamelContext.class);
                          Mockito.when(mockContext.resolvePropertyPlaceholders(Mockito.anyString()))
                                  .thenAnswer(i -> i.getArguments()[0]);
                          SSLEngine sslEngine = sslContextParameters.createSSLContext(mockContext).createSSLEngine();
                          sslEngine.setUseClientMode(true);
                          pipeline.addLast(new SslHandler(sslEngine));
                      }
  
                      // Add the response recorder from channel
                      pipeline.addLast(new SimpleChannelInboundHandler<ByteBuf>() {
                          @Override
                          protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
                              short version = msg.readUnsignedByte();
                              short frame = msg.readUnsignedByte();
                              int sequence = msg.readInt();
                              int remaining = msg.readableBytes();
                              // getting the lumberjack window sizes
                              synchronized (responses) {
                                  responses.add(new LumberjackAckResponse(version, frame, sequence, remaining));
                              }
                          }
                      });
                  }
              };
  
              // Connect to the server
              Channel channel = new Bootstrap() //
                      .group(eventLoopGroup) //
                      .channel(NioSocketChannel.class) //
                      .handler(initializer) //
                      .connect("127.0.0.1", port).sync().channel(); //
  
              // Send the 2 window frames
              TimeUnit.MILLISECONDS.sleep(500);
              channel.writeAndFlush(readSample("io/window10.bin"));
              TimeUnit.MILLISECONDS.sleep(500);
              channel.writeAndFlush(readSample("io/window15.bin"));
              TimeUnit.MILLISECONDS.sleep(500);
              channel.close();
  
              synchronized (responses) {
                  return responses;
              }
          } finally {
              eventLoopGroup.shutdownGracefully();
          }
      }
  
      /**
       * read window frame and writes in ByteBuf
       *
       * @param  resource
       * @return
       */
      private static ByteBuf readSample(String resource) {
          try (InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(resource)) {
              ByteArrayOutputStream output = new ByteArrayOutputStream();
              int input;
              while ((input = stream.read()) != -1) {
                  output.write(input);
              }
              return wrappedBuffer(output.toByteArray());
          } catch (IOException e) {
              throw new RuntimeException("Cannot read sample data", e);
          }
      }
  
      /**
       * Creates SSL Context Parameters for the client
       *
       * @return
       */
      public static SSLContextParameters createClientSSLContextParameters() {
          SSLContextParameters sslContextParameters = new SSLContextParameters();
  
          TrustManagersParameters trustManagersParameters = new TrustManagersParameters();
          KeyStoreParameters trustStore = new CustomKeyStoreParameters();
          trustStore.setPassword("changeit");
          trustStore.setResource(
                  "target/certs/lumberjack-keystore.jks");
          trustManagersParameters.setKeyStore(trustStore);
  
          sslContextParameters.setTrustManagers(trustManagersParameters);
  
          return sslContextParameters;
      }
  
      private static class CustomKeyStoreParameters extends KeyStoreParameters {
  
          @Override
          protected InputStream resolveResource(String resource) throws IOException {
              return new FileInputStream(Paths.get(resource).toFile());
          }
      }
  }
  