/*
    * junixsocket
    *
    * Copyright 2009-2024 Christian Kohlschütter
    *
    * 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
    *
   *     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.newsclub.net.unix.demo.ssl;
  
  import java.io.File;
  import java.io.FileDescriptor;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  import java.security.GeneralSecurityException;
  
  import javax.net.ssl.SSLSocket;
  import javax.net.ssl.SSLSocketFactory;
  import javax.security.auth.DestroyFailedException;
  
  import org.newsclub.net.unix.AFUNIXSocket;
  import org.newsclub.net.unix.AFUNIXSocketAddress;
  import org.newsclub.net.unix.ssl.SSLContextBuilder;
  
  /**
   * A simple SSL demo client.
   *
   * @author Christian Kohlschütter
   * @see SSLDemoServer
   * @see SSLDemoPrerequisites
   */
  public class SSLDemoClient {
    public static void main(String[] args) throws InterruptedException, IOException,
        GeneralSecurityException, DestroyFailedException {
  
      // Enable to see SSL debugging
      // System.setProperty("javax.net.debug", "all");
  
      AFUNIXSocketAddress addr = AFUNIXSocketAddress.of(new File("/tmp/ssldemo"));
  
      SSLSocketFactory clientSocketFactory = SSLContextBuilder.forClient() //
          .withKeyStore(new File("juxclient.p12"), () -> "clientpass".toCharArray()) //
          .withTrustStore(new File("juxclient.truststore"), () -> "clienttrustpass".toCharArray())
          .withDefaultSSLParameters((p) -> {
            // A simple way to disable some undesired protocols:
            // SSLParametersUtil.disableProtocols(p, "TLSv1.0", "TLSv1.1", "TLSv1.2");
  
            // Uncomment to perform endpoint checking of server certificates
            // p.setEndpointIdentificationAlgorithm("HTTPS");
  
          }) //
          .buildAndDestroyBuilder().getSocketFactory();
  
      System.out.println("Connecting to " + addr);
  
      try (AFUNIXSocket plainSocket = AFUNIXSocket.connectTo(addr);
          SSLSocket sslSocket = (SSLSocket) clientSocketFactory.createSocket(plainSocket,
              // This hostname is sent to the server, unless we define an SNI hostname below
              "localhost.junixsocket", //
              plainSocket.getPort(), false)) {
  
        // Setting the client mode manually is not necessary when using SSLContextBuilder
        // sslSocket.setUseClientMode(false);
  
        // Uncomment to send SNI hostname to server
        // SSLParametersUtil.setSNIServerName(sslSocket, new SNIHostName("subdomain.example.com"));
  
        try (InputStream in = sslSocket.getInputStream();
            OutputStream out = sslSocket.getOutputStream()) {
          plainSocket.setOutboundFileDescriptors(FileDescriptor.err);
          System.out.println("Writing byte...");
          out.write(0xAF);
          out.flush();
  
          byte[] by = new byte[11];
          int r = in.read(by);
          System.out.println("Received string: " + new String(by, 0, r, StandardCharsets.UTF_8));
        }
      }
    }
  }