/**
 *
 */

package com.yc.ship.module.trade.framework.common;


import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import javax.servlet.http.HttpServletRequest;
import java.util.Objects;

/**
 * IP地址
 *
 * @author Mark sunlightcs@gmail.com
 */
public class IPUtils {
    private static final Logger logger = LoggerFactory.getLogger(IPUtils.class);

    /**
     * 获取IP地址
     * <p>
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr() {
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        return getIpAddr(Objects.requireNonNull(requestAttributes));
    }

    /**
     * 获取IP地址
     * <p>
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr(RequestAttributes requestAttributes) {
        HttpServletRequest request = (HttpServletRequest) requestAttributes.resolveReference(RequestAttributes.REFERENCE_REQUEST);
        return getIpAddr(request);
    }

    /**
     * 获取IP地址
     * <p>
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = "";
        try {
            ip = request.getHeader("ClientId");
            if (StringUtils.isEmpty(ip) || ip.isEmpty()) {
                ip = getReqIpAddr(request);
            }
        } catch (Exception e) {
            logger.error("IPUtils ERROR ", e);
        }
        //使用代理，则获取第一个IP地址
        ip = ip.replace("，", ",");

        if (ip.contains(",")) {
            ip = ip.split(",")[0];
        }
        return ip;
    }

    /**
     * 获取请求真实IP地址
     *
     * @param request
     * @return
     */
    public static String getReqIpAddr(HttpServletRequest request) {
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception ex) {
            logger.error("请求日志【getIpAddr】：", ex);
        }
        return ip;
    }
}
