Implement async validation of domain field on recovering access

Co-authored-by: Inex Code <inex.code@selfprivacy.org>

assets/translations/en.json

@@ -285,8 +285,9 @@
   },
   "recovering": {
     "recovery_main_header": "Connect to an existing server",
-    "domain_recovery_description": "Enter a server domain you want to get access for",
+    "domain_recovery_description": "Enter a server domain you want to get access for:",
     "domain_recover_placeholder": "Your domain",
+    "domain_recover_error": "Server with such domain is not found",
     "method_select_description": "Select a recovery method:",
     "method_select_other_device": "I have access on another device",
     "method_select_recovery_key": "I have a recovery key",

assets/translations/ru.json

@@ -288,6 +288,7 @@
     "recovery_main_header": "Подключиться к существующему серверу",
     "domain_recovery_description": "Введите домен, по которому вы хотите получить доступ к серверу:",
     "domain_recover_placeholder": "Домен",
+    "domain_recover_error": "Не удалось найти сервер с таким доменом",
     "method_select_description": "Выберите способ входа:",
     "method_select_other_device": "У меня есть доступ на другом устройстве",
     "method_select_recovery_key": "У меня есть ключ восстановления",

lib/logic/cubit/forms/setup/recovering/recovery_domain_form_cubit.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:cubit_form/cubit_form.dart';
+import 'package:easy_localization/easy_localization.dart';
 import 'package:selfprivacy/logic/api_maps/server.dart';
 import 'package:selfprivacy/logic/cubit/server_installation/server_installation_cubit.dart';
 import 'package:selfprivacy/logic/cubit/forms/factories/field_cubit_factory.dart';
@@ -22,10 +23,25 @@ class RecoveryDomainFormCubit extends FormCubit {
         zoneId: ""));
   }
 
-  // @override
-  // FutureOr<bool> asyncValidation() async {
-  //   ; //var client =
-  // }
+  @override
+  FutureOr<bool> asyncValidation() async {
+    var api = ServerApi(
+        hasLogger: false,
+        isWithToken: false,
+        overrideDomain: serverDomainField.state.value);
+
+    // API version doesn't require access token,
+    // so if the entered domain is indeed valid
+    // and the server by it is reachable, we will
+    // be able to confirm the input
+
+    final bool domainValid = await api.getApiVersion() != null;
+    if (!domainValid) {
+      serverDomainField.setError("recovering.domain_recover_error".tr());
+    }
+
+    return domainValid;
+  }
 
   final ServerInstallationCubit initializingCubit;
   late final FieldCubit<String> serverDomainField;

lib/ui/pages/setup/initializing.dart

@@ -17,7 +17,7 @@ import 'package:selfprivacy/ui/components/brand_text/brand_text.dart';
 import 'package:selfprivacy/ui/components/brand_timer/brand_timer.dart';
 import 'package:selfprivacy/ui/components/progress_bar/progress_bar.dart';
 import 'package:selfprivacy/ui/pages/rootRoute.dart';
-import 'package:selfprivacy/ui/pages/setup/recovering/recovery_method_select.dart';
+import 'package:selfprivacy/ui/pages/setup/recovering/recovery_domain.dart';
 import 'package:selfprivacy/utils/route_transitions/basic.dart';
 
 class InitializingPage extends StatelessWidget {
@@ -104,8 +104,8 @@ class InitializingPage extends StatelessWidget {
                                 child: BrandButton.text(
                                   title: 'basis.connect_to_existing'.tr(),
                                   onPressed: () {
-                                    Navigator.of(context).push(
-                                        materialRoute(RecoveryMethodSelect()));
+                                    Navigator.of(context)
+                                        .push(materialRoute(RecoveryDomain()));
                                   },
                                 ),
                               )