76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
package utils
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
)
|
|
|
|
func RespondWithJSON(w http.ResponseWriter, statusCode int, data interface{}) {
|
|
w.Header().Set("Content-Type", "application/json")
|
|
w.WriteHeader(statusCode)
|
|
json.NewEncoder(w).Encode(data)
|
|
}
|
|
|
|
func RespondWithError(w http.ResponseWriter, statusCode int, message string) {
|
|
RespondWithJSON(w, statusCode, map[string]string{"error": message})
|
|
}
|
|
|
|
// DecodeJSONBody декодирует JSON тело запроса
|
|
func DecodeJSONBody(w http.ResponseWriter, r *http.Request, dst interface{}) error {
|
|
if r.Header.Get("Content-Type") != "application/json" {
|
|
return errors.New("Content-Type header is not application/json")
|
|
}
|
|
|
|
r.Body = http.MaxBytesReader(w, r.Body, 1048576) // 1MB limit
|
|
|
|
dec := json.NewDecoder(r.Body)
|
|
dec.DisallowUnknownFields()
|
|
|
|
err := dec.Decode(dst)
|
|
if err != nil {
|
|
var syntaxError *json.SyntaxError
|
|
var unmarshalTypeError *json.UnmarshalTypeError
|
|
|
|
switch {
|
|
case errors.As(err, &syntaxError):
|
|
return fmt.Errorf("request body contains badly-formed JSON (at position %d)", syntaxError.Offset)
|
|
|
|
case errors.Is(err, io.ErrUnexpectedEOF):
|
|
return errors.New("request body contains badly-formed JSON")
|
|
|
|
case errors.As(err, &unmarshalTypeError):
|
|
return fmt.Errorf("request body contains an invalid value for the %q field (at position %d)", unmarshalTypeError.Field, unmarshalTypeError.Offset)
|
|
|
|
case strings.HasPrefix(err.Error(), "json: unknown field "):
|
|
fieldName := strings.TrimPrefix(err.Error(), "json: unknown field ")
|
|
return fmt.Errorf("request body contains unknown field %s", fieldName)
|
|
|
|
case errors.Is(err, io.EOF):
|
|
return errors.New("request body must not be empty")
|
|
|
|
case err.Error() == "http: request body too large":
|
|
return errors.New("request body must not be larger than 1MB")
|
|
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
|
|
err = dec.Decode(&struct{}{})
|
|
if err != io.EOF {
|
|
return errors.New("request body must only contain a single JSON object")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// GetUserIDFromContext извлекает userID из контекста
|
|
func GetUserIDFromContext(r *http.Request) (uint, bool) {
|
|
userID, ok := r.Context().Value("userID").(uint)
|
|
return userID, ok
|
|
}
|