Initial draft

lib/repository/file.dart

@@ -0,0 +1,38 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:image_picker/image_picker.dart';
+
+class FileRepository {
+  const FileRepository({required this.baseDirectory});
+  final Directory baseDirectory;
+
+  Future<File> persistTemporaryFile(XFile file, String name) async {
+    File fileOnDisk = File("${baseDirectory.path}/$name");
+    await fileOnDisk.writeAsBytes(await file.readAsBytes());
+
+    return fileOnDisk;
+  }
+
+  Future<File> persistTemporaryFileFromBytes(Uint8List bytes, String name) async {
+    File fileOnDisk = File("${baseDirectory.path}/$name");
+    await fileOnDisk.writeAsBytes(bytes as List<int>);
+
+    return fileOnDisk;
+  }
+
+  Future<List<File>> getFilesByPrefix(String prefix) async {
+    return await baseDirectory
+        .list()
+        .where((file) => file is File)
+        .map((file) => file as File)
+        .where((file) => file.path.split("/").last.startsWith(prefix))
+        .toList();
+  }
+
+  Future<void> deleteAllFilesByPrefix(String prefix) async {
+    for (File file in await getFilesByPrefix(prefix)) {
+      await file.delete();
+    }
+  }
+}