[#11] Implement local secure storage

Author: Thieurom

lib/di/provider/flutter_secure_storage.dart

@@ -0,0 +1,18 @@
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+class FlutterSecureStorageProvider {
+  FlutterSecureStorage? _storage;
+
+  FlutterSecureStorage getStorage() {
+    _storage ??= _createStorage();
+    return _storage!;
+  }
+
+  FlutterSecureStorage _createStorage() {
+    return const FlutterSecureStorage(
+      aOptions: AndroidOptions(
+        encryptedSharedPreferences: true,
+      ),
+    );
+  }
+}

lib/storage/secure_storage.dart

@@ -0,0 +1,26 @@
+enum SecureStorageKey {
+  apiToken,
+}
+
+extension SecureStorageKeyExt on SecureStorageKey {
+  String get string {
+    switch (this) {
+      case SecureStorageKey.apiToken:
+        return 'API_TOKEN_KEY';
+    }
+  }
+}
+
+abstract class SecureStorageModel {}
+
+enum SecureStorageError {
+  failToRead,
+  failToParse,
+}
+
+abstract class SecureStorage {
+  Future<void> save<M extends SecureStorageModel>(
+      {required M value, required SecureStorageKey key});
+  Future<M> get<M extends SecureStorageModel>(
+      {required String value, required SecureStorageKey key});
+}

lib/storage/secure_storage_impl.dart

@@ -0,0 +1,39 @@
+import 'dart:convert';
+
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:survey_flutter/storage/secure_storage.dart';
+
+import '../di/provider/flutter_secure_storage.dart';
+
+final secureStorageProvider = Provider<SecureStorage>((_) {
+  return SecureStorageImpl(FlutterSecureStorageProvider().getStorage());
+});
+
+class SecureStorageImpl extends SecureStorage {
+  final FlutterSecureStorage _storage;
+  SecureStorageImpl(this._storage);
+
+  @override
+  Future<M> get<M extends SecureStorageModel>(
+      {required String value, required SecureStorageKey key}) async {
+    final rawValue = await _storage.read(key: key.string);
+    if (rawValue == null) {
+      throw SecureStorageError.failToRead;
+    }
+
+    final decodedValue = await jsonDecode(rawValue);
+    if (decodedValue == null) {
+      throw SecureStorageError.failToParse;
+    }
+
+    return decodedValue;
+  }
+
+  @override
+  Future<void> save<M extends SecureStorageModel>(
+      {required M value, required SecureStorageKey key}) async {
+    final encodedValue = jsonEncode(value);
+    await _storage.write(key: key.string, value: encodedValue);
+  }
+}

pubspec.lock

@@ -288,6 +288,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.6"
+  flutter_secure_storage:
+    dependency: "direct main"
+    description:
+      name: flutter_secure_storage
+      sha256: "98352186ee7ad3639ccc77ad7924b773ff6883076ab952437d20f18a61f0a7c5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.0.0"
+  flutter_secure_storage_linux:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_linux
+      sha256: "0912ae29a572230ad52d8a4697e5518d7f0f429052fd51df7e5a7952c7efe2a3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.3"
+  flutter_secure_storage_macos:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_macos
+      sha256: "083add01847fc1c80a07a08e1ed6927e9acd9618a35e330239d4422cd2a58c50"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  flutter_secure_storage_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_platform_interface
+      sha256: b3773190e385a3c8a382007893d678ae95462b3c2279e987b55d140d3b0cb81b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.1"
+  flutter_secure_storage_web:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_web
+      sha256: "42938e70d4b872e856e678c423cc0e9065d7d294f45bc41fc1981a4eb4beaffe"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  flutter_secure_storage_windows:
+    dependency: transitive
+    description:
+      name: flutter_secure_storage_windows
+      sha256: fc2910ec9b28d60598216c29ea763b3a96c401f0ce1d13cdf69ccb0e5c93c3ee
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.0"
   flutter_svg:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -47,6 +47,7 @@ dependencies:
   equatable: ^2.0.0
   internet_connection_checker: ^1.0.0+1
   page_view_dot_indicator: ^2.1.0
+  flutter_secure_storage: ^8.0.0
 
 dev_dependencies:
   build_runner: ^2.4.4