Show accepted signup delivery without a second send step (#62)

frontend/app/lib/auth/form.dart

@@ -99,10 +99,11 @@ class _AuthFormState extends State<AuthForm> {
         return;
       }
       final email = _email.text.trim();
+      final delivery = signup.state.result!.delivery;
       TextInput.finishAutofillContext();
       _password.clear();
       _confirmation.clear();
-      context.goNamed(AppRoutes.verificationSent, extra: email);
+      context.goNamed(AppRoutes.verificationSent, extra: delivery ?? email);
     } else {
       final login = context.read<LoginProvider>();
       await login.login(

frontend/app/lib/routing/router.dart

@@ -4,6 +4,8 @@ import 'package:flutter/widgets.dart';
 
 import 'package:go_router/go_router.dart';
 
+import 'package:sxchnge_auth/sxchnge_auth.dart';
+
 import 'package:sxchnge_wallet/sxchnge_wallet.dart';
 
 import '../auth/page.dart';
@@ -144,6 +146,9 @@ GoRouter createAppRouter({bool Function()? authenticated}) {
         name: AppRoutes.verificationSent,
         builder: (context, state) => VerificationPage(
           email: state.extra is String ? state.extra as String : null,
+          delivery: state.extra is VerificationDelivery
+              ? state.extra as VerificationDelivery
+              : null,
         ),
       ),
       GoRoute(

frontend/app/lib/verification/page.dart

@@ -15,9 +15,10 @@ import '../routing/routes.dart';
 import '../generated/i18n/app_localizations.dart';
 
 class VerificationPage extends StatefulWidget {
-  const VerificationPage({super.key, this.email, this.token});
+  const VerificationPage({super.key, this.email, this.token, this.delivery});
   final String? email;
   final String? token;
+  final VerificationDelivery? delivery;
 
   @override
   State<VerificationPage> createState() => _VerificationPageState();
@@ -25,9 +26,12 @@ class VerificationPage extends StatefulWidget {
 
 class _VerificationPageState extends State<VerificationPage> {
   final _form = GlobalKey<FormState>();
-  late final _email = TextEditingController(text: widget.email);
+  late final _email = TextEditingController(
+    text: widget.delivery?.email ?? widget.email,
+  );
   late final _provider = VerificationProvider(
     context.read<VerificationService>(),
+    delivery: widget.delivery,
   );
   final _emailFocus = FocusNode();
   String? _recipient;
@@ -44,7 +48,7 @@ class _VerificationPageState extends State<VerificationPage> {
         if (!mounted) return;
         if (widget.token != null) {
           _provider.confirm(widget.token!);
-        } else if (_email.text.isNotEmpty) {
+        } else if (widget.delivery == null && _email.text.isNotEmpty) {
           _send();
         }
       });
@@ -58,14 +62,26 @@ class _VerificationPageState extends State<VerificationPage> {
   @override
   void didUpdateWidget(covariant VerificationPage oldWidget) {
     super.didUpdateWidget(oldWidget);
-    if (oldWidget.token == widget.token) return;
-    context.read<JourneyRecorder>().abandon(JourneyExit.navigation);
-    _provider.reset();
+    if (oldWidget.token == widget.token &&
+        oldWidget.email == widget.email &&
+        identical(oldWidget.delivery, widget.delivery)) {
+      return;
+    }
+    if (oldWidget.token != widget.token) {
+      context.read<JourneyRecorder>().abandon(JourneyExit.navigation);
+    }
+    _provider.reset(delivery: widget.delivery);
     _lastWasSend = false;
     _validated = false;
-    _email.clear();
+    _recipient = null;
+    _email.text = widget.delivery?.email ?? widget.email ?? '';
     WidgetsBinding.instance.addPostFrameCallback((_) {
-      if (mounted && widget.token != null) _provider.confirm(widget.token!);
+      if (!mounted) return;
+      if (widget.token != null) {
+        _provider.confirm(widget.token!);
+      } else if (widget.delivery == null && _email.text.isNotEmpty) {
+        _send();
+      }
     });
   }
 

frontend/app/pubspec.lock

@@ -198,7 +198,7 @@ packages:
     source: hosted
     version: "18.0.1"
   http:
-    dependency: transitive
+    dependency: "direct dev"
     description:
       name: http
       sha256: "87721a4a50b19c7f1d49001e51409bddc46303966ce89a65af4f4e6004896412"

frontend/app/pubspec.yaml

@@ -31,6 +31,7 @@ dev_dependencies:
   flutter_test:
     sdk: flutter
   flutter_lints: ^6.0.0
+  http: ^1.6.0
 flutter:
   generate: true
   uses-material-design: true

frontend/app/test/routing_test.dart

@@ -42,6 +42,44 @@ Future<GoRouter> openRoute(
 }
 
 void main() {
+  testWidgets('queued signup receipt is transient and updates its recipient', (
+    tester,
+  ) async {
+    final router = await openRoute(tester, '/');
+    await tester.pumpAndSettle();
+    router.goNamed(
+      AppRoutes.verificationSent,
+      extra: const VerificationDelivery(
+        email: 'first@example.com',
+        isSimulated: false,
+      ),
+    );
+    await tester.pumpAndSettle();
+    expect(find.byKey(const ValueKey('verification-sent')), findsOneWidget);
+    expect(find.text('first@example.com'), findsOneWidget);
+    router.goNamed(
+      AppRoutes.verificationSent,
+      extra: const VerificationDelivery(
+        email: 'second@example.com',
+        isSimulated: false,
+      ),
+    );
+    await tester.pumpAndSettle();
+    expect(find.text('first@example.com'), findsNothing);
+    expect(find.text('second@example.com'), findsOneWidget);
+    final restored = router.routeInformationParser.restoreRouteInformation(
+      router.routerDelegate.currentConfiguration,
+    )!;
+    expect(restored.state.toString(), isNot(contains('second@example.com')));
+    expect(restored.uri.toString(), '/verification-sent');
+    router.goNamed(AppRoutes.login);
+    await tester.pumpAndSettle();
+    router.goNamed(AppRoutes.verificationSent);
+    await tester.pumpAndSettle();
+    expect(find.byKey(const ValueKey('verification-idle')), findsOneWidget);
+    expect(find.text('second@example.com'), findsNothing);
+  });
+
   for (final language in ['en', 'ru']) {
     testWidgets(
       'verified link keeps success visible and prefills login ($language)',

frontend/app/test/signup_delivery_test.dart

@@ -0,0 +1,153 @@
+import 'dart:convert';
+
+import 'package:flutter/material.dart';
+
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:go_router/go_router.dart';
+
+import 'package:http/http.dart' as http;
+import 'package:http/testing.dart';
+
+import 'package:sxchnge_analytics/sxchnge_analytics.dart';
+
+import 'package:sxchnge_auth/sxchnge_auth.dart';
+
+import 'package:sxchnge_app/main.dart';
+import 'package:sxchnge_app/providers/locale.dart';
+
+class DeliveryBackend extends BackendAuthServices {
+  DeliveryBackend(List<String> requests)
+    : super(
+        baseUri: Uri.parse('https://api.example/api/v1'),
+        clientId: 'web',
+        client: MockClient((request) async {
+          requests.add(request.url.path);
+          return http.Response(
+            jsonEncode({
+              'data': request.url.path.endsWith('/signup')
+                  ? {'userId': 'customer'}
+                  : {'accepted': true},
+            }),
+            202,
+          );
+        }),
+      );
+
+  int sends = 0;
+  bool failResend = true;
+
+  @override
+  Future<VerificationResult> send({
+    required String email,
+    required String locale,
+  }) async {
+    sends++;
+    if (failResend) {
+      throw const VerificationException(VerificationError.internal);
+    }
+    return super.send(email: email, locale: locale);
+  }
+}
+
+void main() {
+  for (final language in ['en', 'ru']) {
+    testWidgets(
+      'accepted signup survives an unavailable resend service ($language)',
+      (tester) async {
+        tester.view.physicalSize = const Size(390, 844);
+        tester.view.devicePixelRatio = 1;
+        tester.platformDispatcher.textScaleFactorTestValue = 1.5;
+        addTearDown(tester.view.resetPhysicalSize);
+        addTearDown(tester.view.resetDevicePixelRatio);
+        addTearDown(tester.platformDispatcher.clearTextScaleFactorTestValue);
+        final requests = <String>[];
+        final backend = DeliveryBackend(requests);
+        final analytics = DummyAnalyticsService();
+        await tester.pumpWidget(
+          SxchngeApp(
+            backend: backend,
+            analyticsService: analytics,
+            localeProvider: LocaleProvider(initialLocale: Locale(language)),
+          ),
+        );
+        await tester.pumpAndSettle();
+        final signup = find.text(language == 'ru' ? 'Регистрация' : 'Sign up');
+        await tester.ensureVisible(signup);
+        await tester.tap(signup);
+        await tester.pumpAndSettle();
+        for (final entry in {
+          'name': 'Ada Lovelace',
+          'email': 'ada@example.com',
+          'password': 'password preserved',
+          'confirmation': 'password preserved',
+        }.entries) {
+          await tester.enterText(find.byKey(ValueKey(entry.key)), entry.value);
+        }
+        final submit = find.byKey(const ValueKey('submit'));
+        await tester.ensureVisible(submit);
+        await tester.tap(submit);
+        await tester.pumpAndSettle();
+
+        expect(find.byKey(const ValueKey('verification-sent')), findsOneWidget);
+        expect(find.text('ada@example.com'), findsOneWidget);
+        expect(backend.sends, 0);
+        expect(requests, ['/api/v1/accounts/signup']);
+        final router = GoRouter.of(tester.element(find.byType(Scaffold)));
+        final restored = router.routeInformationParser.restoreRouteInformation(
+          router.routerDelegate.currentConfiguration,
+        )!;
+        expect(restored.uri.toString(), '/verification-sent');
+        expect(restored.state.toString(), isNot(contains('ada@example.com')));
+        expect(
+          analytics.events.where(
+            (event) => event.name == 'auth_signup_succeeded',
+          ),
+          hasLength(1),
+        );
+        expect(
+          analytics.events.where(
+            (event) => event.name == 'auth_email_delivery_succeeded',
+          ),
+          hasLength(1),
+        );
+
+        final resend = find.byKey(const ValueKey('verification-resend'));
+        await tester.ensureVisible(resend);
+        await tester.tap(resend);
+        await tester.pumpAndSettle();
+        expect(
+          find.byKey(const ValueKey('verification-error')),
+          findsOneWidget,
+        );
+        expect(backend.sends, 1);
+        expect(
+          tester
+              .widget<TextFormField>(
+                find.byKey(const ValueKey('verification-email')),
+              )
+              .controller!
+              .text,
+          'ada@example.com',
+        );
+        backend.failResend = false;
+        await tester.ensureVisible(resend);
+        await tester.tap(resend);
+        await tester.pumpAndSettle();
+        expect(find.byKey(const ValueKey('verification-sent')), findsOneWidget);
+        expect(backend.sends, 2);
+        expect(requests.last, '/api/v1/accounts/verification/send');
+        expect(requests, hasLength(2));
+        expect(
+          analytics.events.map((event) => event.journeyId).toSet(),
+          hasLength(1),
+        );
+        expect(
+          analytics.events.map((event) => event.properties).toString(),
+          isNot(contains('ada@example.com')),
+        );
+        expect(tester.takeException(), isNull);
+      },
+    );
+  }
+}

frontend/packages/sxchnge_auth/lib/src/mappers/backend.dart

@@ -12,9 +12,13 @@ abstract final class BackendMapper {
     return VerificationResult(isSimulated: false, verifiedEmail: dto.email);
   }
 
-  static AuthResult signup(BackendDTO dto) {
+  static AuthResult signup(BackendDTO dto, {required String email}) {
     if (dto.userId.isEmpty) throw const FormatException('Missing user');
-    return AuthResult(userId: dto.userId, isSimulated: false);
+    return AuthResult(
+      userId: dto.userId,
+      isSimulated: false,
+      delivery: VerificationDelivery(email: email, isSimulated: false),
+    );
   }
 
   static FactorChallenge challenge(BackendDTO dto, String id) {

frontend/packages/sxchnge_auth/lib/src/mappers/results.dart

@@ -5,6 +5,12 @@ import '../models/verification.dart';
 abstract final class AuthMapper {
   static AuthResult fromDTO(AuthDTO dto) =>
       AuthResult(userId: dto.userId, isSimulated: dto.simulated);
+
+  static AuthResult signup(AuthDTO dto, {required String email}) => AuthResult(
+    userId: dto.userId,
+    isSimulated: dto.simulated,
+    delivery: VerificationDelivery(email: email, isSimulated: dto.simulated),
+  );
 }
 
 abstract final class VerificationMapper {

frontend/packages/sxchnge_auth/lib/src/models/auth.dart

@@ -1,4 +1,5 @@
 import 'two_factor.dart';
+import 'verification.dart';
 
 /// Ephemeral input: never persist, log, or include passwords in provider state.
 class LoginRequest {
@@ -31,9 +32,11 @@ class AuthResult {
     required this.userId,
     required this.isSimulated,
     this.challenge,
+    this.delivery,
   });
   final String userId;
   final FactorChallenge? challenge;
+  final VerificationDelivery? delivery;
   final bool isSimulated;
 }
 

frontend/packages/sxchnge_auth/lib/src/models/verification.dart

@@ -11,6 +11,13 @@ enum VerificationStatus {
 
 enum VerificationError { expired, invalid, internal, needsAssistance }
 
+/// An accepted email-queue operation, not proof of inbox delivery or activation.
+class VerificationDelivery {
+  const VerificationDelivery({required this.email, required this.isSimulated});
+  final String email;
+  final bool isSimulated;
+}
+
 class VerificationException implements Exception {
   const VerificationException(this.code);
   final VerificationError code;

frontend/packages/sxchnge_auth/lib/src/providers/verification.dart

@@ -4,13 +4,22 @@ import '../models/verification.dart';
 import '../services/verification.dart';
 
 class VerificationProvider extends ChangeNotifier {
-  VerificationProvider(this.service);
+  VerificationProvider(this.service, {VerificationDelivery? delivery})
+    : _state = _initialState(delivery);
   final VerificationService service;
-  VerificationState _state = const VerificationState(VerificationStatus.idle);
+  VerificationState _state;
   VerificationState get state => _state;
   bool _disposed = false;
   int _generation = 0;
 
+  static VerificationState _initialState(VerificationDelivery? delivery) =>
+      delivery == null
+      ? const VerificationState(VerificationStatus.idle)
+      : VerificationState(
+          VerificationStatus.sent,
+          isSimulated: delivery.isSimulated,
+        );
+
   Future<void> send({required String email, required String locale}) => _run(
     () => service.send(email: email.trim(), locale: locale),
     VerificationStatus.sending,
@@ -61,10 +70,10 @@ class VerificationProvider extends ChangeNotifier {
     notifyListeners();
   }
 
-  void reset() {
+  void reset({VerificationDelivery? delivery}) {
     if (_disposed) return;
     ++_generation;
-    _state = const VerificationState(VerificationStatus.idle);
+    _state = _initialState(delivery);
     notifyListeners();
   }
 

frontend/packages/sxchnge_auth/lib/src/services/backend.dart

@@ -51,7 +51,6 @@ class BackendAuthServices
   final _pending = <String, ({String token, String challengeId})>{};
   final _grants = <String, AuthSession>{};
   final _retryKeys = <String, String>{};
-  String? _queuedSignup;
   AuthSession? _session;
   AuthSession? get session => _session;
   @override
@@ -113,9 +112,8 @@ class BackendAuthServices
       'locale': r.locale,
       'idempotencyKey': key,
     });
-    final result = BackendMapper.signup(dto);
+    final result = BackendMapper.signup(dto, email: email);
     _retryKeys.remove('signup:$email');
-    _queuedSignup = email;
     return result;
   }
 
@@ -141,14 +139,6 @@ class BackendAuthServices
     required String locale,
   }) async {
     final normalized = email.trim().toLowerCase();
-    // Signup already queued this email. The existing confirmation page requests
-    // its initial delivery on mount; consume that receipt once.
-    if (_queuedSignup == normalized) {
-      _queuedSignup = null;
-      return VerificationMapper.fromDTO(
-        const VerificationDTO(simulated: false),
-      );
-    }
     final key = _retryKeys.putIfAbsent('activation:$normalized', _key);
     try {
       await _post('verification/send', {

frontend/packages/sxchnge_auth/lib/src/services/dummy.dart

@@ -40,8 +40,9 @@ class DummySignupService implements SignupService, SimulationInfo {
   Future<AuthResult> signup(SignupRequest request) async {
     await Future<void>.delayed(delay);
     if (failure case final error?) throw AuthException(error);
-    return AuthMapper.fromDTO(
+    return AuthMapper.signup(
       const AuthDTO(userId: 'demo-user', simulated: true),
+      email: request.email.trim(),
     );
   }
 }

frontend/packages/sxchnge_auth/lib/src/services/instrumented.dart

@@ -111,13 +111,27 @@ class InstrumentedAuthServices
     simulation: _simulation(loginService),
   );
   @override
-  Future<AuthResult> signup(SignupRequest request) => _run(
-    JourneyKind.signup,
-    JourneyStep.signup,
-    () => signupService.signup(request),
-    (r) => r.isSimulated,
-    simulation: _simulation(signupService),
-  );
+  Future<AuthResult> signup(SignupRequest request) async {
+    final result = await _run(
+      JourneyKind.signup,
+      JourneyStep.signup,
+      () => signupService.signup(request),
+      (r) => r.isSimulated,
+      simulation: _simulation(signupService),
+    );
+    final delivery = result.delivery;
+    if (delivery != null) {
+      final operation = recorder.begin(
+        JourneyKind.verification,
+        JourneyStep.emailDelivery,
+        onboarding: true,
+        simulated: delivery.isSimulated,
+      );
+      recorder.finish(operation, simulated: delivery.isSimulated);
+    }
+    return result;
+  }
+
   @override
   Future<VerificationResult> send({
     required String email,

frontend/packages/sxchnge_auth/test/auth_test.dart

@@ -142,11 +142,11 @@ void main() {
           .isSimulated,
       isTrue,
     );
-    expect(
-      (await const DummySignupService(delay: Duration.zero).signup(signup))
-          .isSimulated,
-      isTrue,
-    );
+    final accepted = await const DummySignupService(delay: Duration.zero)
+        .signup(signup);
+    expect(accepted.isSimulated, isTrue);
+    expect(accepted.delivery?.email, 'a@example.com');
+    expect(accepted.delivery?.isSimulated, isTrue);
     await expectLater(
       const DummyLoginService(
         delay: Duration.zero,

frontend/packages/sxchnge_auth/test/backend_test.dart

@@ -89,35 +89,48 @@ void main() {
       expect(keys[0], keys[1]);
     },
   );
-  test('signup receipt avoids duplicate delivery and subsequent resend reaches API', () async {
-    final paths = <String>[];
-    final service = BackendAuthServices(
-      baseUri: Uri.parse('https://api.example/api/v1'),
-      clientId: 'web',
-      client: MockClient((request) async {
-        paths.add(request.url.path);
-        if (request.url.path.endsWith('/signup')) {
-          expect(jsonDecode(request.body)['password'], ' password preserved ');
-          return response({'userId': 'user'});
-        }
-        return response({'accepted': true});
-      }),
-    );
-    addTearDown(service.close);
-    final result = await service.signup(
-      const SignupRequest(
-        name: 'User',
-        email: 'USER@example.com',
-        password: ' password preserved ',
-        locale: 'en',
-      ),
-    );
-    expect(result.isSimulated, isFalse);
-    await service.send(email: 'user@example.com', locale: 'en');
-    expect(paths, ['/api/v1/accounts/signup']);
-    await service.send(email: 'user@example.com', locale: 'en');
-    expect(paths.last, '/api/v1/accounts/verification/send');
-  });
+  test(
+    'signup returns its receipt and every explicit resend reaches API',
+    () async {
+      final paths = <String>[];
+      final service = BackendAuthServices(
+        baseUri: Uri.parse('https://api.example/api/v1'),
+        clientId: 'web',
+        client: MockClient((request) async {
+          paths.add(request.url.path);
+          if (request.url.path.endsWith('/signup')) {
+            expect(
+              jsonDecode(request.body)['password'],
+              ' password preserved ',
+            );
+            return response({'userId': 'user'});
+          }
+          return response({'accepted': true});
+        }),
+      );
+      addTearDown(service.close);
+      final result = await service.signup(
+        const SignupRequest(
+          name: 'User',
+          email: 'USER@example.com',
+          password: ' password preserved ',
+          locale: 'en',
+        ),
+      );
+      expect(result.isSimulated, isFalse);
+      expect(result.delivery?.email, 'user@example.com');
+      expect(result.delivery?.isSimulated, isFalse);
+      expect(paths, ['/api/v1/accounts/signup']);
+      await service.send(email: 'user@example.com', locale: 'en');
+      expect(paths, [
+        '/api/v1/accounts/signup',
+        '/api/v1/accounts/verification/send',
+      ]);
+      await service.send(email: 'user@example.com', locale: 'en');
+      expect(paths.last, '/api/v1/accounts/verification/send');
+      expect(paths, hasLength(3));
+    },
+  );
   test('login confirms backend session only after factor and consumes local grant once', () async {
     final now = DateTime.now();
     var verified = false;

frontend/packages/sxchnge_auth/test/verification_test.dart

@@ -28,6 +28,36 @@ class PendingService implements VerificationService {
 }
 
 void main() {
+  test(
+    'accepted delivery initializes sent state without calling the service',
+    () async {
+      final service = PendingService();
+      final provider = VerificationProvider(
+        service,
+        delivery: const VerificationDelivery(
+          email: 'ada@example.com',
+          isSimulated: false,
+        ),
+      );
+      addTearDown(provider.dispose);
+      expect(provider.state.status, VerificationStatus.sent);
+      expect(provider.state.isSimulated, isFalse);
+      expect(provider.state.result, isNull);
+      expect(service.calls, 0);
+      final resend = provider.send(email: 'ada@example.com', locale: 'en');
+      expect(provider.state.status, VerificationStatus.sending);
+      expect(service.calls, 1);
+      service.pending.completeError(
+        const VerificationException(VerificationError.internal),
+      );
+      await resend;
+      expect(provider.state.status, VerificationStatus.error);
+      expect(provider.state.result, isNull);
+      provider.reset();
+      expect(provider.state.status, VerificationStatus.idle);
+    },
+  );
+
   for (final scenario in {
     'demo-valid': VerificationStatus.verified,
     'demo-expired': VerificationStatus.expired,