package org.springblade.common.utils;

import javax.servlet.http.HttpServletRequest;

public class IpUtils {

    private static final String UNKNOWN = "unknown";

    public static String getIpAddr(HttpServletRequest request) {
        if (request == null) {
            return UNKNOWN;
        }
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.isEmpty() || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.isEmpty() || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        String[] ips = ip.split(",");
        return ips[0].trim();
    }
}
