auth/internal/domain/grant_type.go

45 lines
1003 B
Go

package domain
import (
"errors"
"fmt"
"strings"
)
// NOTE(toby3d): Encapsulate enums in structs for extra compile-time safety:
// https://threedots.tech/post/safer-enums-in-go/#struct-based-enums
type GrantType struct {
slug string
}
//nolint: gochecknoglobals // NOTE(toby3d): structs cannot be constants
var (
GrantTypeUndefined = GrantType{slug: ""}
GrantTypeAuthorizationCode = GrantType{slug: "authorization_code"}
)
var ErrGrantTypeUnknown = errors.New("unknown grant type")
func ParseGrantType(slug string) (GrantType, error) {
if strings.ToLower(slug) == GrantTypeAuthorizationCode.slug {
return GrantTypeAuthorizationCode, nil
}
return GrantTypeUndefined, fmt.Errorf("%w: %s", ErrGrantTypeUnknown, slug)
}
func (gt *GrantType) UnmarshalForm(src []byte) error {
responseType, err := ParseGrantType(string(src))
if err != nil {
return fmt.Errorf("grant_type: %w", err)
}
*gt = responseType
return nil
}
func (gt GrantType) String() string {
return gt.slug
}