readRejoinCredential function

Future<StoredRejoinCredential?> readRejoinCredential(String roomName, String userName)

The stored credential for this room and name, or null (none, expired or unreadable).

Implementation

Future<StoredRejoinCredential?> readRejoinCredential(String roomName, String userName) async {
  if (roomName.isEmpty || userName.isEmpty) return null;
  try {
    final prefs = await SharedPreferences.getInstance();
    final raw = prefs.getString(_keyFor(roomName, userName));
    if (raw == null) return null;
    final decoded = jsonDecode(raw);
    final value = decoded is Map<String, dynamic> ? StoredRejoinCredential.fromJson(decoded) : null;
    if (value == null || DateTime.now().millisecondsSinceEpoch - value.storedAt > _maxAgeMs) {
      await prefs.remove(_keyFor(roomName, userName));
      return null;
    }
    return value;
  } catch (_) {
    return null;
  }
}