Resolves #59 Storing token in secure storage

lib/home_assistant.class.dart

@@ -64,8 +64,15 @@ class HomeAssistant {
     hostname = "$domain:$port";
     _webSocketAPIEndpoint = "${prefs.getString('hassio-protocol')}://$domain:$port/api/websocket";
     httpWebHost = "${prefs.getString('hassio-res-protocol')}://$domain:$port";
-    //_password = prefs.getString('hassio-password');
     _token = prefs.getString('hassio-token');
+    final storage = new FlutterSecureStorage();
+    try {
+      _token = await storage.read(key: "hacl_llt");
+    } catch (e) {
+      Logger.e("Cannt read secure storage. Need to relogin.");
+      _token = null;
+      await storage.delete(key: "hacl_llt");
+    }
     _useLovelace = prefs.getBool('use-lovelace') ?? true;
     if ((domain == null) || (port == null) ||
         (domain.length == 0) || (port.length == 0)) {
@@ -269,7 +276,8 @@ class HomeAssistant {
     Logger.d("Logging out...");
     _token = null;
     _tempToken = null;
-    await SharedPreferences.getInstance().then((prefs) => prefs.remove("hassio-token"));
+    final storage = new FlutterSecureStorage();
+    await storage.delete(key: "hacl_llt");
     ui?.clear();
     entities?.clear();
   }
@@ -294,7 +302,8 @@ class HomeAssistant {
         Logger.d("Got long-lived token: ${data['result']}");
         _token = data['result'];
         _tempToken = null;
-        SharedPreferences.getInstance().then((prefs) => prefs.setString("hassio-token", _token));
+        final storage = new FlutterSecureStorage();
+        storage.write(key: "hacl_llt", value: _token);
       } else {
         logout();
         Logger.e("Error getting long-lived token: ${data['error'].toString()}");

lib/main.dart

@@ -19,6 +19,7 @@ import 'package:flutter_svg/flutter_svg.dart';
 import 'package:flutter_custom_tabs/flutter_custom_tabs.dart';
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 
 part 'entity_class/const.dart';
 part 'entity_class/entity.class.dart';

pubspec.lock

@@ -141,6 +141,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.2.0"
+  flutter_secure_storage:
+    dependency: "direct main"
+    description:
+      name: flutter_secure_storage
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.2.0"
   flutter_svg:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -22,6 +22,7 @@ dependencies:
   flutter_custom_tabs: ^0.6.0
   firebase_messaging: ^4.0.0+1
   flutter_webview_plugin: ^0.3.1
+  flutter_secure_storage: ^3.2.0
 
 dev_dependencies:
   flutter_test: