handle parsing exception for OIDCHttpClient::checkOIDCIsAvailable()

lib/features/login/data/network/oidc_http_client.dart

@@ -13,6 +13,7 @@ import 'package:model/oidc/response/oidc_response.dart';
 import 'package:tmail_ui_user/features/login/data/extensions/service_path_extension.dart';
 import 'package:tmail_ui_user/features/login/data/network/config/oidc_constant.dart';
 import 'package:tmail_ui_user/features/login/data/network/endpoint.dart';
+import 'package:tmail_ui_user/features/login/domain/exceptions/login_exception.dart';
 import 'package:tmail_ui_user/features/login/data/network/oidc_error.dart';
 import 'package:tmail_ui_user/main/utils/app_config.dart';
 import 'package:dio/dio.dart' show DioError;
@@ -40,6 +41,9 @@ class OIDCHttpClient {
       } else {
         return OIDCResponse.fromJson(jsonDecode(result));
       }
+    } on FormatException catch (exception) {
+      log('checkOIDCIsAvailable(): error while parsing server response (JSON expected): ${exception.message}');
+      throw InvalidOIDCResponseException();
     } on DioError catch (exception) {
       if (exception.error is HandshakeException) {
         throw exception.error!;

lib/features/login/domain/exceptions/login_exception.dart

@@ -5,6 +5,8 @@ class NotFoundDataResourceRecordException implements Exception {}
 
 class NotFoundUrlException implements Exception {}
 
+class InvalidOIDCResponseException implements Exception {}
+
 class NoSuitableBrowserForOIDCException implements Exception {
 
   static const noBrowserAvailableCode = 'no_browser_available';

lib/features/login/presentation/login_controller.dart

@@ -274,7 +274,7 @@ class LoginController extends ReloadableController {
   }
 
   void _handleCheckOIDCIsAvailableFailure(CheckOIDCIsAvailableFailure failure) {
-    if (failure.exception is CanNotFoundOIDCLinks) {
+    if (failure.exception is CanNotFoundOIDCLinks || failure.exception is InvalidOIDCResponseException) {
       _handleCommonOIDCFailure();
     } else {
       loginFormType.value = LoginFormType.retry;