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.server;
  
  import java.io.File;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.util.Optional;
  import java.util.logging.Logger;
  import org.openqa.selenium.WebDriverException;
  import org.openqa.selenium.grid.config.Config;
  import org.openqa.selenium.grid.config.ConfigException;
  import org.openqa.selenium.grid.jmx.JMXHelper;
  import org.openqa.selenium.grid.jmx.ManagedAttribute;
  import org.openqa.selenium.grid.jmx.ManagedService;
  import org.openqa.selenium.net.HostIdentifier;
  import org.openqa.selenium.net.NetworkUtils;
  import org.openqa.selenium.net.PortProber;
  
  @ManagedService(
      objectName = "org.seleniumhq.grid:type=Config,name=BaseServerConfig",
      description = "Server config")
  public class BaseServerOptions {
  
    private static final String SERVER_SECTION = "server";
  
    private static final Logger LOG = Logger.getLogger(BaseServerOptions.class.getName());
    private final Config config;
    private int port = -1;
  
    public BaseServerOptions(Config config) {
      this.config = config;
      new JMXHelper().register(this);
    }
  
    public Optional<String> getHostname() {
      return config.get(SERVER_SECTION, "host");
    }
  
    @ManagedAttribute(name = "Port")
    public int getPort() {
      if (port == -1) {
        int newPort = config.getInt(SERVER_SECTION, "port").orElseGet(PortProber::findFreePort);
        if (newPort == -1) {
          newPort = PortProber.findFreePort();
        }
        if (newPort < 0) {
          throw new ConfigException("Port cannot be less than 0: " + port);
        }
  
        port = newPort;
      }
      return port;
    }
  
    @ManagedAttribute(name = "MaxServerThreads")
    public int getMaxServerThreads() {
      int count =
          config
              .getInt(SERVER_SECTION, "max-threads")
              .orElse(Runtime.getRuntime().availableProcessors() * 3);
  
      if (count < 0) {
        throw new ConfigException("Maximum number of server threads cannot be less than 0: " + count);
      }
  
      return count;
    }
  
    @ManagedAttribute(name = "Uri")
    public URI getExternalUri() {
      // Assume the host given is addressable if it's been set
      String host =
          getHostname()
              .orElseGet(
                  () -> {
                    try {
                      return new NetworkUtils().getNonLoopbackAddressOfThisMachine();
                    } catch (WebDriverException e) {
                      String name = HostIdentifier.getHostName();
                      LOG.info("No network connection, guessing name: " + name);
                      return name;
                    }
                  });
  
      int port = getPort();
  
      try {
        return new URI(
            (isSecure() || isSelfSigned()) ? "https" : "http", null, host, port, null, null, null);
      } catch (URISyntaxException e) {
        throw new ConfigException("Cannot determine external URI: " + e.getMessage());
      }
    }
  
    public boolean getAllowCORS() {
      return config.getBool(SERVER_SECTION, "allow-cors").orElse(false);
    }
  
    public boolean getBindHost() {
      return config.getBool(SERVER_SECTION, "bind-host").orElse(true);
    }
  
    public boolean isSecure() {
      return config.get(SERVER_SECTION, "https-private-key").isPresent()
          && config.get(SERVER_SECTION, "https-certificate").isPresent();
    }
  
    public File getPrivateKey() {
      String privateKey = config.get(SERVER_SECTION, "https-private-key").orElse(null);
      if (privateKey != null) {
        return new File(privateKey);
      }
      throw new ConfigException(
          "Please provide a private key via --https-private-key " + "when using --https");
    }
  
    public File getCertificate() {
      String certificatePath = config.get(SERVER_SECTION, "https-certificate").orElse(null);
      if (certificatePath != null) {
        return new File(certificatePath);
      }
      throw new ConfigException(
          "Please provide a certificate via --https-certificate " + "when using --https");
    }
  
    public boolean isSelfSigned() {
      return config.getBool(SERVER_SECTION, "https-self-signed").orElse(false);
    }
  }
  