Gate Flutter app behind Telegram

lib/auth/telegram_launcher.dart

@@ -0,0 +1,2 @@
+export 'telegram_launcher_stub.dart'
+    if (dart.library.js_interop) 'telegram_launcher_web.dart';

lib/auth/telegram_launcher_stub.dart

@@ -0,0 +1 @@
+void openTelegramUrl(String url) {}

lib/auth/telegram_launcher_web.dart

@@ -0,0 +1,8 @@
+import 'dart:js_interop';
+
+@JS('window.open')
+external JSAny? _open(JSString url, JSString target, JSString features);
+
+void openTelegramUrl(String url) {
+  _open(url.toJS, '_blank'.toJS, 'noopener,noreferrer'.toJS);
+}

lib/screens/mapflow_shell.dart

@@ -5,6 +5,7 @@ import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:latlong2/latlong.dart';
 
+import '../auth/telegram_launcher.dart';
 import '../models/place_models.dart';
 import '../state/place_controller.dart';
 
@@ -13,6 +14,10 @@ const _mapboxStyle = String.fromEnvironment(
   'MAPBOX_STYLE',
   defaultValue: 'mapbox/streets-v12',
 );
+const _telegramBotUrl = String.fromEnvironment(
+  'TELEGRAM_BOT_URL',
+  defaultValue: 'https://t.me/carfteebot',
+);
 
 class MapflowShell extends ConsumerWidget {
   const MapflowShell({super.key});
@@ -22,7 +27,12 @@ class MapflowShell extends ConsumerWidget {
     final asyncState = ref.watch(placeControllerProvider);
 
     return asyncState.when(
-      data: (state) => _MapContent(state: state),
+      data: (state) => state.hasTelegramAuth
+          ? _MapContent(state: state)
+          : _TelegramAuthGate(
+              onOpenTelegram: () => openTelegramUrl(_telegramBotUrl),
+              onRetry: () => ref.invalidate(placeControllerProvider),
+            ),
       loading: () => const _MapLoading(),
       error: (error, _) => _MapError(message: error.toString()),
     );
@@ -119,6 +129,71 @@ class _MapContent extends ConsumerWidget {
   }
 }
 
+class _TelegramAuthGate extends StatelessWidget {
+  const _TelegramAuthGate({
+    required this.onOpenTelegram,
+    required this.onRetry,
+  });
+
+  final VoidCallback onOpenTelegram;
+  final VoidCallback onRetry;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Stack(
+        children: [
+          FlutterMap(
+            options: const MapOptions(
+              initialCenter: LatLng(10.7718, 106.6982),
+              initialZoom: 14.2,
+            ),
+            children: [const _BaseMapTileLayer(), const _MapAttribution()],
+          ),
+          ColoredBox(color: Colors.black.withValues(alpha: 0.18)),
+          SafeArea(
+            child: Align(
+              alignment: Alignment.bottomCenter,
+              child: Container(
+                width: double.infinity,
+                margin: const EdgeInsets.all(12),
+                padding: const EdgeInsets.all(14),
+                decoration: BoxDecoration(
+                  color: const Color(0xFFFFFBF5),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  children: [
+                    Text(
+                      'Открой через Telegram, чтобы продолжить.',
+                      style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                        fontWeight: FontWeight.w900,
+                        letterSpacing: 0,
+                      ),
+                    ),
+                    const SizedBox(height: 12),
+                    FilledButton.icon(
+                      onPressed: onOpenTelegram,
+                      icon: const Icon(Icons.telegram),
+                      label: const Text('Telegram'),
+                    ),
+                    TextButton(
+                      onPressed: onRetry,
+                      child: const Text('Обновить'),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
 class _MapLoading extends StatelessWidget {
   const _MapLoading();
 
@@ -132,10 +207,7 @@ class _MapLoading extends StatelessWidget {
               initialCenter: LatLng(10.7718, 106.6982),
               initialZoom: 14.2,
             ),
-            children: [
-              const _BaseMapTileLayer(),
-              const _MapAttribution(),
-            ],
+            children: [const _BaseMapTileLayer(), const _MapAttribution()],
           ),
           const Center(child: CircularProgressIndicator()),
         ],
@@ -159,10 +231,7 @@ class _MapError extends StatelessWidget {
               initialCenter: LatLng(10.7718, 106.6982),
               initialZoom: 14.2,
             ),
-            children: [
-              const _BaseMapTileLayer(),
-              const _MapAttribution(),
-            ],
+            children: [const _BaseMapTileLayer(), const _MapAttribution()],
           ),
           SafeArea(
             child: Align(
@@ -218,9 +287,7 @@ class _MapAttribution extends StatelessWidget {
   Widget build(BuildContext context) {
     if (_mapboxAccessToken.isEmpty) {
       return const RichAttributionWidget(
-        attributions: [
-          TextSourceAttribution('OpenStreetMap contributors'),
-        ],
+        attributions: [TextSourceAttribution('OpenStreetMap contributors')],
       );
     }
 

lib/state/place_controller.dart

@@ -67,6 +67,22 @@ class PlaceController extends AsyncNotifier<PlaceState> {
 
   @override
   Future<PlaceState> build() async {
+    if (!_api.hasTelegramAuth) {
+      return const PlaceState(
+        selectedTrait: PlaceTrait.calm,
+        places: [],
+        selectedPlaceId: null,
+        currentUser: null,
+        hasTelegramAuth: false,
+        reviewDraft: VoiceReviewDraft(
+          placeName: '',
+          duration: Duration.zero,
+          extractedTraits: {},
+          evidence: [],
+        ),
+      );
+    }
+
     final currentUser = await _api.authenticateTelegram();
     final places = await _api.fetchPlaces();
     return PlaceState(