package middleware

import "net/http"

// GetClientIP 获取客户端真实 IP
func GetClientIP(r *http.Request) string {
	xff := r.Header.Get("X-Forwarded-For")
	if xff != "" {
		for i := 0; i < len(xff); i++ {
			if xff[i] == ',' {
				return xff[:i]
			}
		}
		return xff
	}
	if xri := r.Header.Get("X-Real-IP"); xri != "" {
		return xri
	}
	remoteAddr := r.RemoteAddr
	for i := len(remoteAddr) - 1; i >= 0; i-- {
		if remoteAddr[i] == ':' {
			return remoteAddr[:i]
		}
	}
	return remoteAddr
}