package cn.fateverse.gateway.util;

import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequest;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Optional;

/**
* IP工具类
* @date 20-5-15 10:03
*/
public class IpUtils {

    private static final String IP_UNKNOWN = "unknown";
    private static final String IP_LOCAL = "127.0.0.1";
    private static final int IP_LEN = 15;

    /**
     * 获取客户端真实ip
     * @param request request
     * @return 返回ip
     */
    public static String getIP(ServerHttpRequest request) {
        HttpHeaders headers = request.getHeaders();
        String ipAddress = headers.getFirst("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || IP_UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = headers.getFirst("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || IP_UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = headers.getFirst("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || IP_UNKNOWN.equalsIgnoreCase(ipAddress)) {
            ipAddress = Optional.ofNullable(request.getRemoteAddress())
                    .map(address -> address.getAddress().getHostAddress())
                    .orElse("");
            if (IP_LOCAL.equals(ipAddress)) {
                // 根据网卡取本机配置的IP
                try {
                    InetAddress inet = InetAddress.getLocalHost();
                    ipAddress = inet.getHostAddress();
                } catch (UnknownHostException e) {
                    // ignore
                }
            }
        }

        // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > IP_LEN) {
            int index = ipAddress.indexOf(",");
            if (index > 0) {
                ipAddress = ipAddress.substring(0, index);
            }
        }
        return ipAddress;
    }
}