package httpximport (	"encoding/json"	"io"	"log"	"net/http"	"strings")// BindJSON reads r.Body and parses it into v, sends ErrorJSON if error occours.// Returns a bool (ok)func BindJSON[T any](w http.ResponseWriter, r *http.Request, v *T) bool {	ct := r.Header.Get("Content-Type")	if !strings.HasPrefix(ct, "application/json") {		ErrorJSON(w, http.StatusUnsupportedMediaType, "Content-Type must be application/json")		return false	}	dec := json.NewDecoder(r.Body)	dec.DisallowUnknownFields()	if err := dec.Decode(v); err != nil {		ErrorJSON(w, http.StatusBadRequest, "bad JSON: "+err.Error())		return false	}	if dec.Decode(&struct{}{}) != io.EOF {		ErrorJSON(w, http.StatusBadRequest, "JSON must contain only one object")		return false	}	return true}func WriteJSON[T any](w http.ResponseWriter, status int, body T) {	w.Header().Set("Content-Type", "application/json")	w.WriteHeader(status)	_ = json.NewEncoder(w).Encode(body)}type errBody struct {	Error string `json:"error"`}func ErrorJSON(w http.ResponseWriter, status int, msg string) {	WriteJSON(w, status, errBody{Error: msg})}func InternalServerError(w http.ResponseWriter, e error) {	log.Printf("err: %s", e.Error())	ErrorJSON(w, http.StatusInternalServerError, "internal server error")}