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