feat: Implement distinction for connection errors on storage page

Now user gets notified when connection error occurs

lib/logic/api_maps/rest_maps/backblaze.dart

@@ -2,9 +2,12 @@ import 'dart:io';
 
 import 'package:dio/dio.dart';
 import 'package:selfprivacy/config/get_it_config.dart';
+import 'package:selfprivacy/logic/api_maps/api_generic_result.dart';
 import 'package:selfprivacy/logic/api_maps/rest_maps/api_map.dart';
 import 'package:selfprivacy/logic/models/hive/backblaze_credential.dart';
 
+export 'package:selfprivacy/logic/api_maps/api_generic_result.dart';
+
 class BackblazeApiAuth {
   BackblazeApiAuth({required this.authorizationToken, required this.apiUrl});
 
@@ -71,28 +74,46 @@ class BackblazeApi extends ApiMap {
     );
   }
 
-  Future<bool> isValid(final String encodedApiKey) async {
+  Future<APIGenericResult<bool>> isApiTokenValid(
+    final String encodedApiKey,
+  ) async {
     final Dio client = await getClient();
+    bool isTokenValid = false;
     try {
       final Response response = await client.get(
         'b2_authorize_account',
-        options: Options(headers: {'Authorization': 'Basic $encodedApiKey'}),
+        options: Options(
+          followRedirects: false,
+          validateStatus: (final status) =>
+              status != null && (status >= 200 || status == 401),
+          headers: {'Authorization': 'Basic $encodedApiKey'},
+        ),
       );
       if (response.statusCode == HttpStatus.ok) {
         if (response.data['allowed']['capabilities'].contains('listBuckets')) {
-          return true;
+          isTokenValid = true;
         }
-        return false;
+        isTokenValid = false;
       } else if (response.statusCode == HttpStatus.unauthorized) {
-        return false;
+        isTokenValid = false;
       } else {
         throw Exception('code: ${response.statusCode}');
       }
-    } on DioError {
-      return false;
+    } on DioError catch (e) {
+      print(e);
+      return APIGenericResult(
+        data: false,
+        success: false,
+        message: e.toString(),
+      );
     } finally {
       close(client);
     }
+
+    return APIGenericResult(
+      data: isTokenValid,
+      success: true,
+    );
   }
 
   // Create bucket

lib/logic/cubit/forms/setup/initializing/backblaze_form_cubit.dart

@@ -1,13 +1,14 @@
 import 'dart:async';
 import 'package:cubit_form/cubit_form.dart';
+import 'package:selfprivacy/config/get_it_config.dart';
 import 'package:selfprivacy/logic/api_maps/rest_maps/backblaze.dart';
 import 'package:selfprivacy/logic/cubit/server_installation/server_installation_cubit.dart';
+import 'package:selfprivacy/logic/get_it/navigation.dart';
 import 'package:selfprivacy/logic/models/hive/backblaze_credential.dart';
 import 'package:easy_localization/easy_localization.dart';
 
 class BackblazeFormCubit extends FormCubit {
   BackblazeFormCubit(this.serverInstallationCubit) {
-    //var regExp = RegExp(r"\s+|[-!$%^&*()@+|~=`{}\[\]:<>?,.\/]");
     keyId = FieldCubit(
       initalValue: '',
       validations: [
@@ -40,7 +41,7 @@ class BackblazeFormCubit extends FormCubit {
 
   @override
   FutureOr<bool> asyncValidation() async {
-    late bool isKeyValid;
+    late APIGenericResult<bool> backblazeResponse;
     final BackblazeApi apiClient = BackblazeApi(isWithToken: false);
 
     try {
@@ -48,18 +49,30 @@ class BackblazeFormCubit extends FormCubit {
         keyId.state.value,
         applicationKey.state.value,
       );
-      isKeyValid = await apiClient.isValid(encodedApiKey);
+      backblazeResponse = await apiClient.isApiTokenValid(encodedApiKey);
     } catch (e) {
       addError(e);
-      isKeyValid = false;
+      backblazeResponse = APIGenericResult(
+        success: false,
+        data: false,
+        message: e.toString(),
+      );
     }
 
-    if (!isKeyValid) {
-      keyId.setError('initializing.backblaze_bad_key_error'.tr());
-      applicationKey.setError('initializing.backblaze_bad_key_error'.tr());
+    if (!backblazeResponse.success) {
+      getIt<NavigationService>().showSnackBar(
+        'initializing.could_not_connect'.tr(),
+      );
+      keyId.setError('');
+      applicationKey.setError('');
       return false;
     }
 
-    return true;
+    if (!backblazeResponse.data) {
+      keyId.setError('initializing.backblaze_bad_key_error'.tr());
+      applicationKey.setError('initializing.backblaze_bad_key_error'.tr());
+    }
+
+    return backblazeResponse.data;
   }
 }