package main import ( "errors" "fmt" "net/http" "strings" ) func ipFilter(w http.ResponseWriter, r *http.Request) { var err error fmt.Println(r.RemoteAddr) reqIP := strings.Split(r.RemoteAddr, ":")[0] for _, ip := range serverConfig.BlockedIPs { if reqIP == ip { err = errors.New("ip not allowed to post images") } } for _, ip := range serverConfig.AllowedIPs { if reqIP != ip { err = errors.New("ip not allowed to post images") } } //return err if err != nil { fmt.Fprintln(w, err.Error()) return } }