[auth] Add endpoint to check passkey status

auth/lib/core/errors.dart

@@ -42,3 +42,7 @@ class InvalidStateError extends AssertionError {
 class SrpSetupNotCompleteError extends Error {}
 
 class AuthenticatorKeyNotFound extends Error {}
+
+class PassKeySessionNotVerifiedError extends Error {}
+
+class PassKeySessionExpiredError extends Error {}

auth/lib/services/user_service.dart

@@ -266,6 +266,31 @@ class UserService {
     }
   }
 
+  Future<dynamic> getTokenForPasskeySession(String sessionID) async {
+    try {
+      final response = await _dio.get(
+        "${_config.getHttpEndpoint()}/users/two-factor/passkeys/get-token",
+        queryParameters: {
+          "sessionID": sessionID,
+        },
+      );
+      return response.data;
+    } on DioException catch (e) {
+      if (e.response != null) {
+        if (e.response!.statusCode == 404 || e.response!.statusCode == 410) {
+          throw PassKeySessionExpiredError();
+        }
+        if (e.response!.statusCode == 400) {
+          throw PassKeySessionNotVerifiedError();
+        }
+      }
+      rethrow;
+    } catch (e, s) {
+      _logger.severe("unexpected error", e, s);
+      rethrow;
+    }
+  }
+
   Future<void> onPassKeyVerified(BuildContext context, Map response) async {
     final ProgressDialog dialog =
         createProgressDialog(context, context.l10n.pleaseWait);

auth/lib/ui/passkey_page.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 
 import 'package:app_links/app_links.dart';
 import 'package:ente_auth/core/configuration.dart';
+import 'package:ente_auth/core/errors.dart';
 import 'package:ente_auth/l10n/l10n.dart';
 import 'package:ente_auth/models/account/two_factor.dart';
 import 'package:ente_auth/services/user_service.dart';
@@ -51,6 +52,24 @@ class _PasskeyPageState extends State<PasskeyPage> {
     );
   }
 
+  Future<void> checkStatus() async {
+    late dynamic response;
+    try {
+      response = await UserService.instance
+          .getTokenForPasskeySession(widget.sessionID);
+    } on PassKeySessionNotVerifiedError catch (e) {
+      showToast(context, "Verification is still pending.");
+    } on PassKeySessionExpiredError catch (e) {
+      showToast(context, "Passkey session expired. Please try again.");
+      return;
+    } catch (e, s) {
+      _logger.severe("failed to check status", e, s);
+      showGenericErrorDialog(context: context).ignore();
+      return;
+    }
+    await UserService.instance.onPassKeyVerified(context, response);
+  }
+
   Future<void> _handleDeeplink(String? link) async {
     if (!context.mounted ||
         Configuration.instance.hasConfiguredAccount() ||
@@ -129,6 +148,13 @@ class _PasskeyPageState extends State<PasskeyPage> {
               labelText: context.l10n.tryAgain,
               onTap: () => launchPasskey(),
             ),
+            const SizedBox(height: 16),
+            ButtonWidget(
+              buttonType: ButtonType.neutral,
+              labelText: context.l10n.checkForUpdates,
+              onTap: checkStatus,
+              shouldSurfaceExecutionStates: true,
+            ),
             const Padding(padding: EdgeInsets.all(30)),
             GestureDetector(
               behavior: HitTestBehavior.opaque,