use secure storage for password

lib/src/settings/settings_controller.dart

@@ -17,7 +17,7 @@ class SettingsController with ChangeNotifier {
     _themeMode = await _settingsService.themeMode();
     _hostname = await _settingsService.keyStr("hostname");
     _username = await _settingsService.keyStr("username");
-    _password = await _settingsService.keyStr("password");
+    _password = await _settingsService.keyStrSec("password");
     // Important! Inform listeners a change has occurred.
     notifyListeners();
   }
@@ -35,6 +35,10 @@ class SettingsController with ChangeNotifier {
     notifyListeners();
     await _settingsService.setKeyStr(key, value);
   }
+  Future<void> _setKeySec(String key, String value) async {
+    notifyListeners();
+    await _settingsService.setKeyStrSec(key, value);
+  }
 
   Future<void> setHostname(String newHostname) async {
     _hostname = newHostname;
@@ -48,24 +52,16 @@ class SettingsController with ChangeNotifier {
   }
   Future<void> setPassword(String newPassword) async {
     _password = newPassword;
-    await _setKey("password", password);
+    await _setKeySec("password", password);
     Log().debug("password update");
   }
-  /// Update and persist the ThemeMode based on the user's selection.
+
   Future<void> updateThemeMode(ThemeMode? newThemeMode) async {
     if (newThemeMode == null) return;
-
-    // Do not perform any work if new and old ThemeMode are identical
     if (newThemeMode == _themeMode) return;
-
-    // Otherwise, store the new ThemeMode in memory
     _themeMode = newThemeMode;
 
-    // Important! Inform listeners a change has occurred.
     notifyListeners();
-
-    // Persist the changes to a local database or the internet using the
-    // SettingService.
     await _settingsService.updateThemeMode(newThemeMode);
   }
 }

lib/src/settings/settings_service.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 
 /// A service that stores and retrieves user settings.
 ///
@@ -7,6 +8,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 /// persist the user settings locally, use the shared_preferences package. If
 /// you'd like to store settings on a web server, use the http package.
 class SettingsService {
+
   /// Loads the User's preferred ThemeMode from local or remote storage.
   Future<ThemeMode> themeMode() async {
     final SharedPreferences prefs = await SharedPreferences.getInstance();
@@ -32,4 +34,16 @@ class SettingsService {
     final SharedPreferences prefs = await SharedPreferences.getInstance();
     await prefs.setString(key, value);
   }
+
+  Future<String> keyStrSec(String key) async {
+    const storage = FlutterSecureStorage();
+    String? res = await storage.read(key: key);
+    if (res == null) return "";
+    return res;
+  }
+
+  Future<void> setKeyStrSec(String key, String value) async {
+    const storage = FlutterSecureStorage();
+    await storage.write(key: key, value: value);
+  }
 }

linux/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,10 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <flutter_secure_storage_linux/flutter_secure_storage_linux_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) flutter_secure_storage_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "FlutterSecureStorageLinuxPlugin");
+  flutter_secure_storage_linux_plugin_register_with_registrar(flutter_secure_storage_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  flutter_secure_storage_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

pubspec.yaml

@@ -18,6 +18,7 @@ dependencies:
   shared_preferences:
   async: ^2.11.0
   logger: ^2.2.0
+  flutter_secure_storage: ^9.2.1
 
   flutter_gen: any
 dev_dependencies: