cookies as persistent storage

mobile/lib/controllers/session.dart

@@ -1,12 +1,40 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:mobile/models/user.dart';
 import 'package:mobile/results.dart';
 import 'package:mobile/server/server.dart';
+import 'package:path_provider/path_provider.dart';
+
+class CookieController {
+  CookieController();
+
+  static Future<File> get _cacheFile async {
+    final directory = await getApplicationCacheDirectory();
+    return File("${directory.path}/cookies.txt").create();
+  }
+
+  Future<void> clear() async {
+    (await _cacheFile).writeAsString("", mode: FileMode.write);
+  }
+
+  Future<void> save(String token) async {
+    (await _cacheFile).writeAsString(token, mode: FileMode.write);
+  }
+
+  Future<Result<String, Null>> load() async {
+    final token = await (await _cacheFile).readAsString();
+    if (token.isEmpty) {
+      return const Err(null);
+    }
+    return Ok(token);
+  }
+}
 
 class SessionController {
   final Server server;
+  final CookieController cookieController = CookieController();
 
-  String? _sessionToken;
   User? _sessionUser;
 
   final List<_ChangeListener> _sessionChangeListeners = [];
@@ -18,7 +46,7 @@ class SessionController {
     final loginResult = await server.login(email, password);
     switch (loginResult) {
       case Ok<String, String>(value: final sessionToken):
-        _sessionToken = sessionToken;
+        await cookieController.save(sessionToken);
         notifySessionChangeListeners();
         return const Ok(null);
       case Err<String, String>(value: final message):
@@ -27,8 +55,13 @@ class SessionController {
   }
 
   Future<Result<Null, Null>> loadCachedUser() async {
-    // TODO: retrieve session from cache, if exists
+    switch (await cookieController.load()) {
+      case Ok<String, Null>():
         return _loadCurrentUser();
+      case Err<String, Null>():
+        notifyUserChangeListeners();
+        return const Err(null);
+    }
   }
 
   Future<Result<Null, Null>> loadUpdatedUser() async {
@@ -49,13 +82,16 @@ class SessionController {
   }
 
   Future<Null> logout() async {
-    final sessionToken = _sessionToken;
-    if (sessionToken == null) {
+    switch (await cookieController.load()) {
+      case Ok<String, Null>(value: final sessionToken):
+        await server.logout(sessionToken);
+        await cookieController.clear();
+        _sessionUser = null;
+        notifySessionChangeListeners();
+      case Err<String, Null>():
+        notifySessionChangeListeners();
         return;
     }
-    await server.logout(sessionToken);
-    _sessionToken = null;
-    notifySessionChangeListeners();
   }
 
   User get user {
@@ -86,14 +122,14 @@ class SessionController {
   Future<Result<T, String>> requestWithSession<T>(
       Future<Result<T, String>> Function(Server server, String sessionToken)
           func) async {
-    final sessionToken = _sessionToken;
-    if (sessionToken == null) {
+    switch (await cookieController.load()) {
+      case Err<String, Null>():
         return const Err("unathorized");
-    }
+      case Ok<String, Null>(value: final sessionToken):
         final result = await func(server, sessionToken);
         if (result case Err<T, String>(value: final message)) {
           if (message == "unauthorized") {
-        _sessionToken = null;
+            cookieController.clear();
             _sessionUser = null;
             notifySessionChangeListeners();
             notifyUserChangeListeners();
@@ -102,6 +138,7 @@ class SessionController {
         }
         return result;
     }
+  }
 
   void notifySessionChangeListeners() {
     for (final listener in _sessionChangeListeners) {

mobile/lib/main.dart

@@ -18,6 +18,7 @@ import 'package:provider/provider.dart';
 import 'package:mobile/controllers/routing.dart';
 
 void main() {
+  WidgetsFlutterBinding.ensureInitialized();
   final server = BackendServer();
   final usersController = UsersController(server: server);
   final sessionController = SessionController(server: server);
@@ -47,6 +48,7 @@ class MyApp extends StatelessWidget {
   Widget build(BuildContext context) {
     return MultiProvider(
       providers: [
+        Provider(create: (_) => CookieController()),
         ChangeNotifierProvider(
             create: (_) => SessionProvider(controller: sessionController)),
         ChangeNotifierProvider(
@@ -79,12 +81,12 @@ class MyApp extends StatelessWidget {
             useMaterial3: true,
           ),
           home: Consumer2<SessionProvider, CurrentUserProvider>(
-            builder: (_, provider1, provider2, ___) {
-              if (provider1.controller.hasUser) {
+            builder: (_, sessionProvider, currentUserProvider, ___) {
+              if (sessionProvider.controller.hasUser) {
                 return Dashboard();
               }
               return FutureBuilder(
-                  future: provider1.controller.loadCachedUser(),
+                  future: sessionProvider.controller.loadCachedUser(),
                   builder: (_, snapshot) {
                     final error = snapshot.error;
                     if (error != null) {

mobile/lib/pages/all_products_page.dart

@@ -102,12 +102,12 @@ class AllProductsPage extends StatefulWidget {
 }
 
 class _AllProductsPageState extends State<AllProductsPage> {
-  final seawchContwowwew = TextEditingController();
+  final searchController = TextEditingController();
 
   @override
   void initState() {
-    final contwowwew = context.read<ProductController>();
-    seawchContwowwew.text = contwowwew.query;
+    final controller = context.read<ProductController>();
+    searchController.text = controller.query;
     super.initState();
   }
 
@@ -128,7 +128,7 @@ class _AllProductsPageState extends State<AllProductsPage> {
                         onChanged: (query) {
                           productRepo.searchProducts(query);
                         },
-                        controller: seawchContwowwew,
+                        controller: searchController,
                         decoration: const InputDecoration(
                             label: Text("Search"),
                             contentPadding: EdgeInsets.only(top: 20))),