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package com.github.xiaoyuge5201.ip;

import javax.servlet.http.HttpServletRequest;

/**
 * 获取ip地址
 * @author yugb
 */
public class IPUtils {
    private static final String UNKNOWN = "unknown";
    private static final String DEFAULT_SEPARATOR = ",";
    private static final int DEFAULT_IP_LENGTH = 15;

    /**
     * 获取ip地址
     * @param request 请求
     * @return 結果
     */
	public static String getIPAddress(HttpServletRequest request){
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            // 代理IP
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            // 网宿cdn的真实ip
            ip = request.getHeader("Cdn-Src-Ip");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            // 蓝讯cdn的真实ip
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
            // 真实IP
            ip = request.getRemoteAddr();
        }
        // 如果是多级代理，那么取第一个ip为客户端ip
        if (ip != null && ip.length() > DEFAULT_IP_LENGTH && ip.contains(DEFAULT_SEPARATOR)) {
            String[] ips = ip.split(DEFAULT_SEPARATOR);
            for (String strIp : ips) {
                if (!UNKNOWN.equalsIgnoreCase(strIp)) {
                    ip = strIp;
                    break;
                }
            }
        }
		return ip;
	}
	
    //Nginx代理传递的实际客户端 IP-header
    public static final String[] HEADERS_TO_TRY = {
            "X-Forwarded-For",
            "X-REAL-IP",
            "Proxy-Client-IP",
            "WL-Proxy-Client-IP",
            "HTTP_X_FORWARDED_FOR",
            "HTTP_X_FORWARDED",
            "HTTP_X_CLUSTER_CLIENT_IP",
            "HTTP_CLIENT_IP",
            "HTTP_FORWARDED_FOR",
            "HTTP_FORWARDED",
            "HTTP_VIA",
            "REMOTE_ADDR",
            "REMOTE-HOST"
    };

    /**
     * 获取客户端的IP地址
     * @param request 请求
     * @return 结果
     */
    public static String getClientIp(HttpServletRequest request) {
        String clientIp = _getClientIp(request);
        if (null != clientIp && !clientIp.trim().isEmpty()) {
            return clientIp;
        }
        return request.getRemoteAddr();
    }
    /**
     * @param request 请求
     * @return 结果
     */
    private static String _getClientIp(HttpServletRequest request) {
        for (String header : HEADERS_TO_TRY) {
            String ip = request.getHeader(header);
            if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
                return ip;
            }
        }
        return request.getRemoteAddr();
    }
}