time.go

package jwt

import (
	"encoding/json"
	"time"

	"github.com/gbrlsnchs/jwt/v3/internal"
)

// Time is the allowed format for time, as per the RFC 7519.
type Time struct {
	time.Time
}

// NumericDate is a resolved Unix time.
func NumericDate(tt time.Time) *Time {
	if tt.Before(internal.Epoch) {
		tt = internal.Epoch
	}
	return &Time{time.Unix(tt.Unix(), 0)} // set time using Unix time
}

// MarshalJSON implements a marshaling function for time-related claims.
func (t Time) MarshalJSON() ([]byte, error) {
	if t.Before(internal.Epoch) {
		return json.Marshal(0)
	}
	return json.Marshal(t.Unix())
}

// UnmarshalJSON implements an unmarshaling function for time-related claims.
func (t *Time) UnmarshalJSON(b []byte) error {
	var unix *int64
	if err := json.Unmarshal(b, &unix); err != nil {
		return err
	}
	if unix == nil {
		return nil
	}
	tt := time.Unix(*unix, 0)
	if tt.Before(internal.Epoch) {
		tt = internal.Epoch
	}
	t.Time = tt
	return nil
}