code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.openqa.selenium.grid.security;
  
  import static java.util.Base64.getEncoder;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.util.Arrays;
  import java.util.Optional;
  import org.openqa.selenium.UsernameAndPassword;
  import org.openqa.selenium.grid.config.Config;
  import org.openqa.selenium.grid.config.ConfigException;
  
  public class SecretOptions {
  
    private static final String ROUTER_SECTION = "router";
    private static final String SERVER_SECTION = "server";
  
    private final Config config;
  
    public SecretOptions(Config config) {
      this.config = config;
    }
  
    public Secret getRegistrationSecret() {
      String secret = "";
      if ((isSecure() || isSelfSigned())
          && !config.get(SERVER_SECTION, "registration-secret").isPresent()) {
        try {
          secret =
              getEncoder()
                  .encodeToString(
                      Arrays.copyOfRange(Files.readAllBytes(getCertificate().toPath()), 0, 32));
          return new Secret(secret);
        } catch (IOException e) {
          throw new ConfigException("Cannot read the certificate file: " + e.getMessage());
        }
      }
      return config
          .get(SERVER_SECTION, "registration-secret")
          .map(Secret::new)
          .orElse(new Secret(secret));
    }
  
    public UsernameAndPassword getServerAuthentication() {
      Optional<String> username = config.get(ROUTER_SECTION, "username");
      Optional<String> password = config.get(ROUTER_SECTION, "password");
  
      if (!username.isPresent() || !password.isPresent()) {
        return null;
      }
  
      return new UsernameAndPassword(username.get(), password.get());
    }
  
    private boolean isSecure() {
      return config.get(SERVER_SECTION, "https-private-key").isPresent()
          && config.get(SERVER_SECTION, "https-certificate").isPresent();
    }
  
    private boolean isSelfSigned() {
      return config.getBool(SERVER_SECTION, "https-self-signed").orElse(false);
    }
  
    private File getCertificate() {
      String certificatePath = config.get(SERVER_SECTION, "https-certificate").orElse(null);
      if (certificatePath != null) {
        return new File(certificatePath);
      }
      throw new ConfigException(
          "You must provide a certificate via --https-certificate when using --https");
    }
  }
  