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package top.bluesword.util.network;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;

/**
 * 获取本地ip4的工具
 * @author 李林峰
 */
public class LocalIpAddressUtil {

    private LocalIpAddressUtil() {
    }

    /**
     * 获取本地ip地址列表，兼容多网卡情景
     * @return 本地ip地址列表
     * @throws SocketException if an I/O error occurs,
     *             or if the platform does not have at least one configured
     *              network interface.
     */
    public static Set resolveLocalAddresses() throws SocketException {
        Set addresses = new HashSet<>();
        Enumeration ns = NetworkInterface.getNetworkInterfaces();
        while (ns.hasMoreElements()) {
            NetworkInterface n = ns.nextElement();
            Enumeration is = n.getInetAddresses();
            while (is.hasMoreElements()) {
                InetAddress i = is.nextElement();
                if (!i.isLoopbackAddress() && !i.isLinkLocalAddress() && !i.isMulticastAddress()
                        && !isSpecialIp(i.getHostAddress())) addresses.add(i);
            }
        }
        return addresses;
    }

    /**
     * 获取字符串ip4地址
     * @return 字符串ip4地址
     * @throws SocketException if an I/O error occurs,
     *             or if the platform does not have at least one configured
     *              network interface.
     */
    public static Set resolveLocalIps() throws SocketException {
        Set ret = new HashSet<>();
        for (InetAddress addr : resolveLocalAddresses()) ret.add(addr.getHostAddress());
        return ret;
    }

    /**
     * 判断是否是特殊专用地址
     */
    private static boolean isSpecialIp(String ip) {
        return ip.contains(":") || ip.startsWith("169.254.") || ip.startsWith("127.");
    }

}