package com.foreverwin.mesnac.common.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

public class IPUtil {

    public static String getIp(){
        String serverIp = "";
        try {
            Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            while (netInterfaces.hasMoreElements() && serverIp == "") {
                NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
                Enumeration inetAddrs = ni.getInetAddresses();
                while ( inetAddrs.hasMoreElements() ){
                    ip = (InetAddress) inetAddrs.nextElement();
                    if (!ip.isLoopbackAddress() && ip.isSiteLocalAddress() ) {
                        serverIp = ip.getHostAddress();
                        break;
                    } else {
                        ip = null;
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return serverIp;
    }

    /**
     * 获取客户端IP地址
     * @param request
     * @return
     * @throws Exception
     */
    public static String getIp(HttpServletRequest request) throws Exception {
        String ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }
    }
