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uid.go
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uid.go
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package actoruid
import (
"errors"
"strings"
"github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
"github.com/google/uuid"
)
const prefix = "urn:opg:poas:makeregister:users:"
type UID struct{ value string }
func New() UID {
return UID{value: uuid.NewString()}
}
func FromRequest(r interface{ FormValue(string) string }) UID {
return UID{value: r.FormValue("id")}
}
func (u UID) IsZero() bool {
return len(u.value) == 0
}
func (u UID) String() string {
return u.value
}
func (u UID) PrefixedString() string {
return prefix + u.value
}
func (u UID) MarshalJSON() ([]byte, error) {
if u.value == "" {
return []byte("null"), nil
}
return []byte(`"` + u.PrefixedString() + `"`), nil
}
func (u *UID) UnmarshalText(text []byte) error {
if len(text) == 0 {
return nil
}
uid, found := strings.CutPrefix(string(text), prefix)
if !found {
return errors.New("invalid uid prefix")
}
u.value = uid
return nil
}
func (u UID) MarshalDynamoDBAttributeValue() (types.AttributeValue, error) {
return attributevalue.Marshal(u.value)
}
func (u *UID) UnmarshalDynamoDBAttributeValue(av types.AttributeValue) error {
return attributevalue.Unmarshal(av, &u.value)
}