VB10

  @override
  Future<ItemModel?> takeItemWithCache(int? id) async {
    if (_directory == null) {
      final appDirectory = await createDirectory();
      _directory ??= await Directory('${appDirectory.path}/$_localPath').create();
    }
    final items = await _directory!.list().toSet();
    final _item = items.firstWhereOrNull((element) => element.path.contains('$id'));

    if (_item != null) {

VB10

  @override
  Future<void> clearAllDatasWithExpiry() async {
    final directory = await createDirectory();
    final itemDirectory = await Directory('${directory.path}/$_localPath').create();
    final items = await itemDirectory.list().toSet();
    await Future.forEach<FileSystemEntity>(items, (element) async {
      final file = File(element.path);

      final jsonBody = json.decode(await file.readAsString());
      final feedItem = ItemModel.fromJson(jsonBody);

VB10

 @override
  Future<void> cacheIt() async {
    final file = await createDirectoryWithPath();
    item.itemValues = encrypData.crypteFile(item.itemValues ?? '');
    await file.writeAsString(jsonEncode(item));
  }

VB10

class ItemModelCache extends ItemCache {
  late final EncrypData encrypData;

  Directory? _directory;

  ItemModelCache(ItemModel item) : super(item) {
    encrypData = EncrypData();
  }
  factory ItemModelCache.dummy() {
    return ItemModelCache(ItemModel.dummy());

VB10

abstract class ItemCache {
  final String _localPath = 'vb10';
  final ItemModel item;

  ItemCache(this.item);
  Future<void> cacheIt();
  Future<Directory> createDirectory();
  Future<File> createDirectoryWithPath();

  Future<ItemModel?> takeItemWithCache(int id);

VB10

  Future<Uint8List?> fetchData() async {
    final data = await homeService.downloadFile(model.document ?? '');
    return data;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: buildFloatingActionButtonDownlaod(),
      appBar: AppBar(title: Text(model.title ?? '')),

VB10

 @override
  void initState() {
    super.initState();
    homeService = HomeService(EncryptNetworkManager().manager);
    _fetchAndShow();
  }

  Future<void> _fetchAndShow() async {
    _changeLoading();
    items = await homeService.fetchItem();

VB10

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: buildGridViewBody(),
    );
  }

  GridView buildGridViewBody() {
    return GridView.builder(

VB10

  test('Cache Model & Encryption', () async {
    final model = ItemModel(id: 1345);
    final crypto = EncrypData();
    final directory = await getApplicationDocumentsDirectory();
    await Directory('${directory.path}').create();
    await Directory('${directory.path}/vb2').create();
    final path = '${directory.path}/vb2/${model.title}.json';
    final file = File(path);
    final modelValuesWithCrypto = crypto.crypteFile(model.toString());
    await file.writeAsString(modelValuesWithCrypto);

VB10

class EncrypData implements IEncrypData {
  late final Key key;
  late final IV iv;

  final String _privateKey = 'privateKey';
  final String _privateINV = 'privateINV';

  EncrypData() {
    key = Key.fromUtf8(dotenv.env[_privateKey] ?? '');
    iv = IV.fromUtf8(utf8.decode((dotenv.env[_privateINV] ?? '').codeUnits));