package com.nq.utils.ip;


import javax.servlet.http.HttpServletRequest;


public class IpUtils {
    public static String getIp(HttpServletRequest request) {
        if (null == request) {
            return "";
        }

        String ip = request.getHeader("X-Real-IP");
        if (isBlankIp(ip)) {
            ip = request.getHeader("X-real-ip");
        }
        if (isBlankIp(ip)) {
            ip = request.getHeader("x-forwarded-for");
        }
        if (isBlankIp(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (isBlankIp(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (isBlankIp(ip)) {
            ip = request.getRemoteAddr();
        }
        if (ip != null && ip.contains(",")) {
            ip = ip.split(",")[0].trim();
        }
        if ("0:0:0:0:0:0:0:1".equals(ip) || "::1".equals(ip)) {
            ip = "127.0.0.1";
        }
        return ip == null ? "" : ip.trim();
    }

    private static boolean isBlankIp(String ip) {
        return ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip);
    }
}