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body.go
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body.go
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package forms
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"strings"
)
// DecodeBody function.
func DecodeBody(w http.ResponseWriter, r *http.Request, dst interface{}) error {
if r.Header.Get("Content-Type") != "" {
value := r.Header.Get("Content-Type")
if !strings.Contains(value, "/json") && !strings.Contains(value, "+json") {
return &Error{
Status: http.StatusUnsupportedMediaType,
Msg: "Content-Type header contains an invalid value",
}
}
}
r.Body = http.MaxBytesReader(w, r.Body, 1048576)
dec := json.NewDecoder(r.Body)
err := dec.Decode(&dst)
if err != nil {
var syntaxError *json.SyntaxError
var unmarshalTypeError *json.UnmarshalTypeError
switch {
case errors.As(err, &syntaxError):
return &Error{
Status: http.StatusBadRequest,
Msg: fmt.Sprintf("Request body contains badly-formed JSON (at position %d)", syntaxError.Offset),
}
case errors.Is(err, io.ErrUnexpectedEOF):
return &Error{
Status: http.StatusBadRequest,
Msg: "Request body contains badly-formed JSON",
}
case errors.As(err, &unmarshalTypeError):
return &Error{
Status: http.StatusBadRequest,
Msg: fmt.Sprintf(
"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 &Error{
Status: http.StatusBadRequest,
Msg: fmt.Sprintf("Request body contains unknown field %s", fieldName),
}
case errors.Is(err, io.EOF):
return &Error{
Status: http.StatusBadRequest,
Msg: "Request body must not be empty",
}
case err.Error() == "http: request body too large":
return &Error{
Status: http.StatusRequestEntityTooLarge,
Msg: "Request body must not be larger than 1MB",
}
default:
return err
}
}
err = dec.Decode(&struct{}{})
if err != io.EOF {
return &Error{
Status: http.StatusBadRequest,
Msg: "Request body must only contain a single JSON object",
}
}
return nil
}