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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 ratpack.server.internal;

import com.google.common.net.HostAndPort;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;

public class HostUtil {

  public static String determineHost(InetSocketAddress socketAddress) {
    InetAddress address = socketAddress.getAddress();
    return determineHost(address);
  }

  public static String determineHost(HostAndPort hostAndPort) {
    try {
      InetAddress address = InetAddress.getByName(hostAndPort.getHost());
      return determineHost(address);
    } catch (UnknownHostException e) {
      return hostAndPort.getHost();
    }
  }

  private static String determineHost(InetAddress address) {
    if (address.isLoopbackAddress() || address.isAnyLocalAddress()) {
      return "localhost";
    } else {
      return address.getHostAddress();
    }
  }
}