init method

@override Future<StorageRepository> init()

Initializes the secure storage repository.

This method should be called as early as possible in the application lifecycle. It ensures that a secure encryption key is generated and stored securely.

• If an encryption key does not exist, it generates a new one.
• If an error occurs while reading the encryption key, it clears secure storage.

Returns an instance of StorageRepository once initialization is complete.

Implementation

@override
Future<StorageRepository> init() async {
  const encryptionKeyStorageKey = StorageRepositoryKeys.encryptionKey;

  var containsEncryptionKey = false;

  try {
    // Check if an encryption key already exists in secure storage.
    containsEncryptionKey =
        await flutterSecureStorage.read(key: encryptionKeyStorageKey) != null;
  } on PlatformException catch (_) {
    // If there's an error accessing secure storage, clear all stored data.
    await flutterSecureStorage.deleteAll();
  }

  // If no encryption key exists, generate a new one and store it securely.
  if (!containsEncryptionKey) {
    final secureEncryptionKey = base64UrlEncode(Hive.generateSecureKey());
    await flutterSecureStorage.write(
      key: encryptionKeyStorageKey,
      value: secureEncryptionKey,
    );
  }

  // Retrieve and decode the encryption key for Hive storage.
  final encryptionKeyValue = base64Url.decode(
    await flutterSecureStorage.read(key: encryptionKeyStorageKey) ?? '',
  );

  // Open a Hive box with AES encryption.
  storage = await Hive.openBox(
    key,
    encryptionCipher: HiveAesCipher(encryptionKeyValue),
  );

  return this;
}