Add QrCode authentication

moneymgr_mobile/lib/providers/auth_state.dart

@@ -58,7 +58,7 @@ enum AuthState {
   unknown(redirectPath: homePage, allowedPaths: [homePage]),
   unauthenticated(
     redirectPath: authPage,
-    allowedPaths: [authPage, manualAuthPage, settingsPage],
+    allowedPaths: [authPage, qrAuthPath, manualAuthPage, settingsPage],
   ),
   authenticated(
     redirectPath: homePage,

moneymgr_mobile/lib/routes/login/base_auth_page.dart

@@ -35,12 +35,14 @@ class BaseAuthPage extends StatelessWidget {
         ],
       ),
       body: SingleChildScrollView(
-        child: SeparatedColumn(
-          padding: EdgeInsets.all(context.gutter),
-          separatorBuilder: () => const Gutter(),
-          mainAxisAlignment: MainAxisAlignment.center,
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: children,
+        child: IntrinsicHeight(
+          child: SeparatedColumn(
+            padding: EdgeInsets.all(context.gutter),
+            separatorBuilder: () => const Gutter(),
+            mainAxisAlignment: MainAxisAlignment.center,
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: children,
+          ),
         ),
       ),
     );

moneymgr_mobile/lib/routes/login/login_screen.dart

@@ -24,7 +24,7 @@ class LoginScreen extends HookConsumerWidget {
           label: "Enter manually authentication information",
         ),
         _LoginChoice(
-          route: manualAuthPage,
+          route: qrAuthPath,
           icon: Icons.qr_code_2,
           label: "Scan authentication Qr Code",
         ),

moneymgr_mobile/lib/routes/login/qr_auth_screen.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:go_router/go_router.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:logging/logging.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:moneymgr_mobile/providers/auth_state.dart';
+import 'package:moneymgr_mobile/services/api/api_token.dart';
+import 'package:moneymgr_mobile/services/router/routes_list.dart';
+import 'package:moneymgr_mobile/utils/extensions.dart';
+
+class QrAuthScreen extends HookConsumerWidget {
+  const QrAuthScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final loading = useState(false);
+
+    handleCapture(BarcodeCapture barcodes) async {
+      if (loading.value) return;
+
+      if (barcodes.barcodes.length != 1) return;
+      final b = barcodes.barcodes[0];
+
+      if (b.format != BarcodeFormat.qrCode) {
+        context.showTextSnackBar(
+          "Only QrCode are supported!",
+          duration: Duration(seconds: 1),
+        );
+        return;
+      }
+
+      final value = b.rawValue ?? "";
+
+      Logger.root.finest("Decoded QrCode: $value");
+
+      if (!value.startsWith("moneymgr://")) {
+        context.showTextSnackBar(
+          "Not a MoneyMgr Qr Code!",
+          duration: Duration(seconds: 1),
+        );
+        return;
+      }
+
+      // Decode token
+      final uri = Uri.parse(
+        value.replaceFirst("moneymgr://", "http://test.com/?"),
+      );
+      final token = ApiToken(
+        apiUrl: uri.queryParameters["api"] ?? "",
+        tokenId: int.tryParse(uri.queryParameters["id"] ?? "") ?? 0,
+        tokenValue: uri.queryParameters["secret"] ?? "",
+      );
+
+      // Attempt to authenticate using token
+      try {
+        loading.value = true;
+
+        await ref.read(currentAuthStateProvider.notifier).setAuthToken(token);
+
+        if (context.mounted) {
+          if (context.canPop()) context.pop();
+          context.replace(profilePage);
+        }
+      } catch (e, s) {
+        Logger.root.severe("Failed to authenticate user! $e $s");
+        if (context.mounted) {
+          context.showTextSnackBar("Failed to authenticate user! $e");
+        }
+      } finally {
+        loading.value = false;
+      }
+    }
+
+    return Scaffold(
+      appBar: AppBar(title: Text('QR Authentication')),
+      body: MobileScanner(onDetect: handleCapture),
+    );
+  }
+}

moneymgr_mobile/lib/services/router/router.dart

@@ -4,6 +4,7 @@ import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:moneymgr_mobile/providers/auth_state.dart';
 import 'package:moneymgr_mobile/routes/login/login_screen.dart';
 import 'package:moneymgr_mobile/routes/login/manual_auth_screen.dart';
+import 'package:moneymgr_mobile/routes/login/qr_auth_screen.dart';
 import 'package:moneymgr_mobile/routes/settings/settings_screen.dart';
 import 'package:moneymgr_mobile/services/router/routes_list.dart';
 import 'package:moneymgr_mobile/widgets/scaffold_with_navigation.dart';
@@ -61,6 +62,7 @@ GoRouter router(Ref ref) {
     routes: [
       GoRoute(path: homePage, builder: (_, __) => const Scaffold()),
       GoRoute(path: authPage, builder: (_, __) => const LoginScreen()),
+      GoRoute(path: qrAuthPath, builder: (_, __) => const QrAuthScreen()),
       GoRoute(
         path: manualAuthPage,
         builder: (_, __) => const ManualAuthScreen(),

moneymgr_mobile/lib/services/router/routes_list.dart

@@ -4,6 +4,9 @@ const homePage = "/";
 /// Authentication path
 const authPage = "/login";
 
+/// Qr Code authentication
+const qrAuthPath = "/login/qr";
+
 /// Manual authentication
 const manualAuthPage = "/login/manual";
 

moneymgr_mobile/lib/services/storage/secure_storage.dart

@@ -51,6 +51,7 @@ class SecureStorage {
     if (tokenStr != null) {
       return ApiToken.fromJson(jsonDecode(tokenStr));
     }
+    return null;
   }
 
   /// Set auth token

moneymgr_mobile/lib/utils/extensions.dart

@@ -15,18 +15,21 @@ extension BuildContextX on BuildContext {
 
   /// Shows a floating snack bar with text as its content.
   ScaffoldFeatureController<SnackBar, SnackBarClosedReason> showTextSnackBar(
-      String text,
-      ) =>
-      ScaffoldMessenger.of(this).showSnackBar(SnackBar(
-        behavior: SnackBarBehavior.floating,
-        content: Text(text),
-      ));
+    String text, {
+    Duration? duration,
+  }) => ScaffoldMessenger.of(this).showSnackBar(
+    SnackBar(
+      behavior: SnackBarBehavior.floating,
+      content: Text(text),
+      duration: duration ?? Duration(milliseconds: 4000),
+    ),
+  );
 
   void showAppLicensePage() => showLicensePage(
     context: this,
     useRootNavigator: true,
     applicationName: 'MoneyMgr',
-    applicationLegalese: '(c) Pierre HUBERT 2025 - ${DateTime.now().year}'
+    applicationLegalese: '(c) Pierre HUBERT 2025 - ${DateTime.now().year}',
   );
 }