package webutils

import (
	"net"
	"net/http"
	"strings"
)

func ClientIP(r *http.Request, useCDN bool) string {
	if useCDN {
		xForwardedFor := r.Header.Get("X-Forwarded-For")
		ip := strings.TrimSpace(strings.Split(xForwardedFor, ",")[0])
		if ip != "" {
			return ip
		}

		ip = strings.TrimSpace(r.Header.Get("X-Real-Ip"))
		if ip != "" {
			return ip
		}
	}

	if ip, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr)); err == nil {
		return ip
	}

	return ""
}