restore method
Restores a stored session for sub, refreshing it if it has expired.
Returns null when no session is stored for sub.
Implementation
Future<OAuthSession?> restore(final String sub) async {
final session = await _sessionStore.find(sub);
if (session == null) return null;
final expiresAt = session.expiresAt;
if (expiresAt != null && expiresAt.isBefore(DateTime.now().toUtc())) {
return refresh(session);
}
return session;
}