package com.simon.springbootaccesslimit.config.ip;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;

/**
 * @author simon
 */
public class IpUtil {

    public static final String IP_KNOWN = "unknown";
    public static String getIpAddress(HttpServletRequest request) {

        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || IP_KNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || IP_KNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || IP_KNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || IP_KNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || IP_KNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        // 获取到多个ip时取第一个作为客户端真实ip
        if (StringUtils.isNotEmpty(ip) && ip.contains(",")) {
            String[] ipArray = ip.split(",");
            if (ArrayUtils.isNotEmpty(ipArray)) {
                ip = ipArray[0];
            }
        }
        return ip;
    }
}