Handle logged out sessions

lib/events/trigger_logout_event.dart

@@ -0,0 +1,3 @@
+import 'package:ente_auth/events/event.dart';
+
+class TriggerLogoutEvent extends Event {}

lib/onboarding/view/onboarding_page.dart

@@ -1,10 +1,15 @@
 // ignore_for_file: import_of_legacy_library_into_null_safe
 
+import 'dart:async';
+
 import 'package:ente_auth/core/configuration.dart';
+import 'package:ente_auth/core/event_bus.dart';
 import 'package:ente_auth/ente_theme_data.dart';
+import 'package:ente_auth/events/trigger_logout_event.dart';
 import "package:ente_auth/l10n/l10n.dart";
 import 'package:ente_auth/ui/account/email_entry_page.dart';
 import 'package:ente_auth/ui/account/login_page.dart';
+import 'package:ente_auth/ui/account/logout_dialog.dart';
 import 'package:ente_auth/ui/account/password_entry_page.dart';
 import 'package:ente_auth/ui/account/password_reentry_page.dart';
 import 'package:ente_auth/ui/common/gradient_button.dart';
@@ -19,6 +24,23 @@ class OnboardingPage extends StatefulWidget {
 }
 
 class _OnboardingPageState extends State<OnboardingPage> {
+  late StreamSubscription<TriggerLogoutEvent> _triggerLogoutEvent;
+
+  @override
+  void initState() {
+    _triggerLogoutEvent =
+        Bus.instance.on<TriggerLogoutEvent>().listen((event) async {
+      await autoLogoutAlert(context);
+    });
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    _triggerLogoutEvent.cancel();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     debugPrint("Building OnboardingPage");

lib/services/authenticator_service.dart

@@ -8,6 +8,7 @@ import 'package:ente_auth/core/event_bus.dart';
 import 'package:ente_auth/core/network.dart';
 import 'package:ente_auth/events/codes_updated_event.dart';
 import 'package:ente_auth/events/signed_in_event.dart';
+import 'package:ente_auth/events/trigger_logout_event.dart';
 import 'package:ente_auth/gateway/authenticator.dart';
 import 'package:ente_auth/models/authenticator/auth_entity.dart';
 import 'package:ente_auth/models/authenticator/auth_key.dart';
@@ -132,6 +133,9 @@ class AuthenticatorService {
       await _localToRemoteSync();
       _logger.info("local push completed");
       Bus.instance.fire(CodesUpdatedEvent());
+    } on UnauthorizedError {
+      debugPrint("Firing logout event");
+      Bus.instance.fire(TriggerLogoutEvent());
     } catch (e) {
       _logger.severe("Failed to sync with remote", e);
     }
@@ -140,7 +144,7 @@ class AuthenticatorService {
   Future<void> _remoteToLocalSync() async {
     _logger.info('Initiating remote to local sync');
     final int lastSyncTime = _prefs.getInt(_lastEntitySyncTime) ?? 0;
-    _logger.info("Current synctime is " + lastSyncTime.toString());
+    _logger.info("Current sync is " + lastSyncTime.toString());
     const int fetchLimit = 500;
     final List<AuthEntity> result =
         await _gateway.getDiff(lastSyncTime, limit: fetchLimit);

lib/ui/account/logout_dialog.dart

@@ -0,0 +1,34 @@
+import 'package:ente_auth/core/configuration.dart';
+import 'package:ente_auth/utils/dialog_util.dart';
+import 'package:flutter/material.dart';
+
+Future<void> autoLogoutAlert(BuildContext context) async {
+  final AlertDialog alert = AlertDialog(
+    title: const Text("Session expired"),
+    content: const Text("Please login again"),
+    actions: [
+      TextButton(
+        child: Text(
+          "Ok",
+          style: TextStyle(
+            color: Theme.of(context).colorScheme.primary,
+          ),
+        ),
+        onPressed: () async {
+          Navigator.of(context, rootNavigator: true).pop('dialog');
+          Navigator.of(context).popUntil((route) => route.isFirst);
+          final dialog = createProgressDialog(context, "Logging out...");
+          await dialog.show();
+          await Configuration.instance.logout();
+          await dialog.hide();
+        },
+      ),
+    ],
+  );
+  await showDialog(
+    context: context,
+    builder: (BuildContext context) {
+      return alert;
+    },
+  );
+}

lib/ui/home_page.dart

@@ -7,12 +7,14 @@ import 'dart:ui';
 import 'package:ente_auth/core/event_bus.dart';
 import 'package:ente_auth/ente_theme_data.dart';
 import 'package:ente_auth/events/codes_updated_event.dart';
+import 'package:ente_auth/events/trigger_logout_event.dart';
 import "package:ente_auth/l10n/l10n.dart";
 import 'package:ente_auth/models/code.dart';
 import 'package:ente_auth/onboarding/view/setup_enter_secret_key_page.dart';
 import 'package:ente_auth/services/preference_service.dart';
 import 'package:ente_auth/services/user_service.dart';
 import 'package:ente_auth/store/code_store.dart';
+import 'package:ente_auth/ui/account/logout_dialog.dart';
 import 'package:ente_auth/ui/code_widget.dart';
 import 'package:ente_auth/ui/common/loading_widget.dart';
 import 'package:ente_auth/ui/scanner_page.dart';
@@ -43,6 +45,7 @@ class _HomePageState extends State<HomePage> {
   List<Code> _codes = [];
   List<Code> _filteredCodes = [];
   StreamSubscription<CodesUpdatedEvent>? _streamSubscription;
+  StreamSubscription<TriggerLogoutEvent>? _triggerLogoutEvent;
 
   @override
   void initState() {
@@ -51,6 +54,10 @@ class _HomePageState extends State<HomePage> {
     _streamSubscription = Bus.instance.on<CodesUpdatedEvent>().listen((event) {
       _loadCodes();
     });
+    _triggerLogoutEvent =
+        Bus.instance.on<TriggerLogoutEvent>().listen((event) async {
+      await autoLogoutAlert(context);
+    });
     super.initState();
   }
 
@@ -84,6 +91,7 @@ class _HomePageState extends State<HomePage> {
   @override
   void dispose() {
     _streamSubscription?.cancel();
+    _triggerLogoutEvent?.cancel();
     _textController.removeListener(_applyFiltering);
     super.dispose();
   }