50 lines
1.1 KiB
Go
50 lines
1.1 KiB
Go
package auth
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"errors"
|
|
"time"
|
|
|
|
"aidanwoods.dev/go-paseto"
|
|
)
|
|
|
|
const TokenTTL = 90 * 24 * time.Hour
|
|
|
|
var ErrInvalidToken = errors.New("invalid token")
|
|
|
|
// Manager issues and verifies paseto v4-local bearer tokens bound to a device_id.
|
|
type Manager struct {
|
|
key paseto.V4SymmetricKey
|
|
}
|
|
|
|
func NewManager(secret string) (*Manager, error) {
|
|
sum := sha256.Sum256([]byte(secret))
|
|
key, err := paseto.V4SymmetricKeyFromBytes(sum[:])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Manager{key: key}, nil
|
|
}
|
|
|
|
func (m *Manager) Issue(deviceID string) (string, error) {
|
|
now := time.Now()
|
|
token := paseto.NewToken()
|
|
token.SetIssuedAt(now)
|
|
token.SetNotBefore(now)
|
|
token.SetExpiration(now.Add(TokenTTL))
|
|
token.SetSubject(deviceID)
|
|
return token.V4Encrypt(m.key, nil), nil
|
|
}
|
|
|
|
func (m *Manager) Verify(signed string) (string, error) {
|
|
parsed, err := paseto.NewParserForValidNow().ParseV4Local(m.key, signed, nil)
|
|
if err != nil {
|
|
return "", ErrInvalidToken
|
|
}
|
|
subject, err := parsed.GetSubject()
|
|
if err != nil {
|
|
return "", ErrInvalidToken
|
|
}
|
|
return subject, nil
|
|
}
|