store: Handle invalid API key on register-queue

Fixes: zulip#737

Signed-off-by: Zixuan James Li <[email protected]>

Author: PIG208

assets/l10n/app_en.arb

@@ -458,6 +458,13 @@
   "@topicValidationErrorMandatoryButEmpty": {
     "description": "Topic validation error when topic is required but was empty."
   },
+  "errorInvalidApiKeyMessage": "Your account at {url} could not be authenticated. Please try logging in again or use another account.",
+  "@errorInvalidApiKeyMessage": {
+    "description": "Error message in the dialog for invalid API key.",
+    "placeholders": {
+      "url": {"type": "String", "example": "http://chat.example.com/"}
+    }
+  },
   "errorInvalidResponse": "The server sent an invalid response",
   "@errorInvalidResponse": {
     "description": "Error message when an API call returned an invalid response."

lib/generated/l10n/zulip_localizations.dart

@@ -721,6 +721,12 @@ abstract class ZulipLocalizations {
   /// **'Topics are required in this organization.'**
   String get topicValidationErrorMandatoryButEmpty;
 
+  /// Error message in the dialog for invalid API key.
+  ///
+  /// In en, this message translates to:
+  /// **'Your account at {url} could not be authenticated. Please try logging in again or use another account.'**
+  String errorInvalidApiKeyMessage(String url);
+
   /// Error message when an API call returned an invalid response.
   ///
   /// In en, this message translates to:

lib/generated/l10n/zulip_localizations_ar.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Topics are required in this organization.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'The server sent an invalid response';
 

lib/generated/l10n/zulip_localizations_en.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Topics are required in this organization.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'The server sent an invalid response';
 

lib/generated/l10n/zulip_localizations_fr.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsFr extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Topics are required in this organization.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'The server sent an invalid response';
 

lib/generated/l10n/zulip_localizations_ja.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Topics are required in this organization.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'The server sent an invalid response';
 

lib/generated/l10n/zulip_localizations_pl.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Wątki są wymagane przez tę organizację.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'Nieprawidłowa odpowiedź serwera';
 

lib/generated/l10n/zulip_localizations_ru.dart

@@ -357,6 +357,11 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   @override
   String get topicValidationErrorMandatoryButEmpty => 'Topics are required in this organization.';
 
+  @override
+  String errorInvalidApiKeyMessage(String url) {
+    return 'Your account at $url could not be authenticated. Please try logging in again or use another account.';
+  }
+
   @override
   String get errorInvalidResponse => 'The server sent an invalid response';
 

lib/model/store.dart

@@ -19,6 +19,7 @@ import '../api/backoff.dart';
 import '../api/route/realm.dart';
 import '../log.dart';
 import '../notifications/receive.dart';
+import '../widgets/actions.dart';
 import 'autocomplete.dart';
 import 'database.dart';
 import 'emoji.dart';
@@ -149,13 +150,31 @@ abstract class GlobalStore extends ChangeNotifier {
   /// and/or [perAccountSync].
   Future<PerAccountStore> loadPerAccount(int accountId) async {
     assert(_accounts.containsKey(accountId));
-    final store = await doLoadPerAccount(accountId);
+    PerAccountStore? store;
+    try {
+      store = await doLoadPerAccount(accountId);
+    } catch (e) {
+      switch (e) {
+        case ZulipApiException(code: 'INVALID_API_KEY'):
+          // The API key is invalid and the store can never be loaded
+          // unless the user retries manually.
+          final zulipLocalizations = GlobalLocalizations.zulipLocalizations;
+          final account = getAccount(accountId)!;
+          reportErrorToUserModally(
+            zulipLocalizations.errorCouldNotConnectTitle,
+            details: zulipLocalizations.errorInvalidApiKeyMessage(
+              account.realmUrl.toString()));
+          await logOutAccount(this, accountId);
+        default:
+          rethrow;
+      }
+    }
     if (!_accounts.containsKey(accountId)) {
-      // [removeAccount] was called during [doLoadPerAccount].
-      store.dispose();
+      // [removeAccount] was called during or after [doLoadPerAccount].
+      store?.dispose();
       throw AccountNotFoundException();
     }
-    return store;
+    return store!;
   }
 
   /// Load per-account data for the given account, unconditionally.
@@ -912,7 +931,13 @@ class UpdateMachine {
         // at 1 kiB (at least on Android), and stack can be longer than that.
         assert(debugLog('Stack:\n$s'));
         assert(debugLog('Backing off, then will retry…'));
-        // TODO tell user if initial-fetch errors persist, or look non-transient
+        // TODO(#890): tell user if initial-fetch errors persist, or look non-transient
+        switch (e) {
+          case ZulipApiException(code: 'INVALID_API_KEY'):
+            // We cannot recover from this error through retrying.
+            // Leave it to [GlobalStore.loadPerAccount].
+            rethrow;
+        }
         await (backoffMachine ??= BackoffMachine()).wait();
         assert(debugLog('… Backoff wait complete, retrying initial fetch.'));
       }
@@ -1044,7 +1069,13 @@ class UpdateMachine {
       }
     } catch (e) {
       if (_disposed) return;
-      await _handlePollError(e);
+      try {
+        await _handlePollError(e);
+      } on AccountNotFoundException {
+        // Cannot recover by replacing the store because the account
+        // was logged out.
+        return;
+      }
       assert(_disposed);
       return;
     }

lib/widgets/app.dart

@@ -189,6 +189,11 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
     final themeData = zulipThemeData(context);
     return GlobalStoreWidget(
       child: Builder(builder: (context) {
+        final effectiveNavigatorObservers = [
+          _EmptyStackNavigatorObserver(),
+          if (widget.navigatorObservers != null)
+            ...widget.navigatorObservers!,
+        ];
         final globalStore = GlobalStoreWidget.of(context);
         // TODO(#524) choose initial account as last one used
         final initialAccountId = globalStore.accounts.firstOrNull?.id;
@@ -199,7 +204,7 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
           theme: themeData,
 
           navigatorKey: ZulipApp.navigatorKey,
-          navigatorObservers: widget.navigatorObservers ?? const [],
+          navigatorObservers: effectiveNavigatorObservers,
           builder: (BuildContext context, Widget? child) {
             if (!ZulipApp.ready.value) {
               SchedulerBinding.instance.addPostFrameCallback(
@@ -230,6 +235,36 @@ class _ZulipAppState extends State<ZulipApp> with WidgetsBindingObserver {
   }
 }
 
+class _EmptyStackNavigatorObserver extends NavigatorObserver {
+  void _pushIfEmpty() async {
+    final navigator = await ZulipApp.navigator;
+    bool isEmptyStack = true;
+    // TODO: find a better way to inspect the navigator stack
+    navigator.popUntil((route) {
+      isEmptyStack = false;
+      return true; // never actually pops
+    });
+    if (isEmptyStack) {
+      unawaited(navigator.push(
+        MaterialWidgetRoute(page: const ChooseAccountPage())));
+    }
+  }
+
+  @override
+  void didRemove(Route<void> route, Route<void>? previousRoute) async {
+    if (previousRoute == null) {
+      _pushIfEmpty();
+    }
+  }
+
+  @override
+  void didPop(Route<void> route, Route<void>? previousRoute) async {
+    if (previousRoute == null) {
+      _pushIfEmpty();
+    }
+  }
+}
+
 class ChooseAccountPage extends StatelessWidget {
   const ChooseAccountPage({super.key});
 

test/model/store_test.dart

@@ -7,6 +7,7 @@ import 'package:flutter/foundation.dart';
 import 'package:http/http.dart' as http;
 import 'package:test/scaffolding.dart';
 import 'package:zulip/api/core.dart';
+import 'package:zulip/api/exception.dart';
 import 'package:zulip/api/model/events.dart';
 import 'package:zulip/api/model/model.dart';
 import 'package:zulip/api/route/events.dart';
@@ -500,6 +501,20 @@ void main() {
         users.map((expected) => (it) => it.fullName.equals(expected.fullName)));
     }));
 
+    test('GlobalStore.perAccount on INVALID_API_KEY', () => awaitFakeAsync((async) async {
+      addTearDown(testBinding.reset);
+
+      await testBinding.globalStore.insertAccount(eg.selfAccount.toCompanion(false));
+      testBinding.globalStore.loadPerAccountException = ZulipApiException(
+        routeName: '/register', code: 'INVALID_API_KEY', httpStatus: 400,
+        data: {}, message: '');
+      await check(testBinding.globalStore.perAccount(eg.selfAccount.id))
+        .throws<AccountNotFoundException>();
+
+      check(testBinding.globalStore.takeDoRemoveAccountCalls())
+        .single.equals(eg.selfAccount.id);
+    }));
+
     // TODO test UpdateMachine.load starts polling loop
     // TODO test UpdateMachine.load calls registerNotificationToken
   });
@@ -843,6 +858,25 @@ void main() {
       check(store.debugMessageListViews).isEmpty();
     }));
 
+    test('log out if fail to reload on unexpected errors', () => awaitFakeAsync((async) async {
+      await preparePoll();
+
+      prepareUnexpectedLoopError();
+      updateMachine.debugAdvanceLoop();
+      async.elapse(Duration.zero);
+      check(store).isLoading.isTrue();
+
+      globalStore.loadPerAccountException = ZulipApiException(
+        routeName: '/register', code: 'INVALID_API_KEY', httpStatus: 400,
+        data: {}, message: '');
+      // The reload doesn't happen immediately; there's a timer.
+      check(async.pendingTimers).length.equals(1);
+      async.flushTimers();
+
+      check(globalStore.takeDoRemoveAccountCalls().single)
+        .equals(eg.selfAccount.id);
+    }));
+
     group('report error', () {
       String? lastReportedError;
       String? takeLastReportedError() {

test/model/test_store.dart

@@ -126,6 +126,7 @@ class TestGlobalStore extends GlobalStore {
 
   static const Duration removeAccountDuration = Duration(milliseconds: 1);
   Duration? loadPerAccountDuration;
+  Object? loadPerAccountException;
 
   /// Consume the log of calls made to [doRemoveAccount].
   List<int> takeDoRemoveAccountCalls() {
@@ -147,6 +148,9 @@ class TestGlobalStore extends GlobalStore {
     if (loadPerAccountDuration != null) {
       await Future<void>.delayed(loadPerAccountDuration!);
     }
+    if (loadPerAccountException != null) {
+      throw loadPerAccountException!;
+    }
     final initialSnapshot = _initialSnapshots[accountId]!;
     final store = PerAccountStore.fromInitialSnapshot(
       globalStore: this,