fix: Implement Backblaze bucket restoration on server recovery (#324)

Resolves issue [320](https://git.selfprivacy.org/SelfPrivacy/selfprivacy.org.app/issues/320).

Co-authored-by: NaiJi <naijiworld@protonmail.com>
Reviewed-on: https://git.selfprivacy.org/SelfPrivacy/selfprivacy.org.app/pulls/324
Reviewed-by: Inex Code <inex.code@selfprivacy.org>

lib/logic/api_maps/rest_maps/backblaze.dart

@@ -2,6 +2,8 @@ import 'dart:io';
 
 import 'package:dio/dio.dart';
 import 'package:selfprivacy/config/get_it_config.dart';
+import 'package:selfprivacy/logic/models/backup.dart';
+import 'package:selfprivacy/logic/models/hive/backblaze_bucket.dart';
 import 'package:selfprivacy/logic/models/hive/backups_credential.dart';
 import 'package:selfprivacy/logic/api_maps/generic_result.dart';
 import 'package:selfprivacy/logic/api_maps/rest_maps/rest_api_map.dart';
@@ -179,6 +181,42 @@ class BackblazeApi extends RestApiMap {
     }
   }
 
+  Future<BackblazeBucket?> fetchBucket(
+    final BackupsCredential credentials,
+    final BackupConfiguration configuration,
+  ) async {
+    BackblazeBucket? bucket;
+    final BackblazeApiAuth auth = await getAuthorizationToken();
+    final Dio client = await getClient();
+    client.options.baseUrl = auth.apiUrl;
+    final Response response = await client.get(
+      '$apiPrefix/b2_list_buckets',
+      queryParameters: {
+        'accountId': getIt<ApiConfigModel>().backblazeCredential!.keyId,
+      },
+      options: Options(
+        headers: {'Authorization': auth.authorizationToken},
+      ),
+    );
+    close(client);
+    if (response.statusCode == HttpStatus.ok) {
+      for (final rawBucket in response.data['buckets']) {
+        if (rawBucket['bucketId'] == configuration.locationId) {
+          bucket = BackblazeBucket(
+            bucketId: rawBucket['bucketId'],
+            bucketName: rawBucket['bucketName'],
+            encryptionKey: configuration.encryptionKey,
+            applicationKeyId: '',
+            applicationKey: '',
+          );
+        }
+      }
+      return bucket;
+    } else {
+      throw Exception('code: ${response.statusCode}');
+    }
+  }
+
   @override
   bool hasLogger;
 

lib/logic/cubit/backups/backups_cubit.dart

@@ -109,17 +109,34 @@ class BackupsCubit extends ServerInstallationDependendCubit<BackupsState> {
 
   Future<void> reuploadKey() async {
     emit(state.copyWith(preventActions: true));
-    final BackblazeBucket? bucket = getIt<ApiConfigModel>().backblazeBucket;
+    BackblazeBucket? bucket = getIt<ApiConfigModel>().backblazeBucket;
     if (bucket == null) {
       emit(state.copyWith(isInitialized: false));
     } else {
+      String login = bucket.applicationKeyId;
+      String password = bucket.applicationKey;
+      if (login.isEmpty || password.isEmpty) {
+        final BackblazeApplicationKey key =
+            await backblaze.createKey(bucket.bucketId);
+        login = key.applicationKeyId;
+        password = key.applicationKey;
+        bucket = BackblazeBucket(
+          bucketId: bucket.bucketId,
+          bucketName: bucket.bucketName,
+          encryptionKey: bucket.encryptionKey,
+          applicationKey: password,
+          applicationKeyId: login,
+        );
+        await getIt<ApiConfigModel>().storeBackblazeBucket(bucket);
+        emit(state.copyWith(backblazeBucket: bucket));
+      }
       final GenericResult result = await api.initializeRepository(
         InitializeRepositoryInput(
           provider: BackupsProviderType.backblaze,
           locationId: bucket.bucketId,
           locationName: bucket.bucketName,
-          login: bucket.applicationKeyId,
-          password: bucket.applicationKey,
+          login: login,
+          password: password,
         ),
       );
       if (result.success == false) {
@@ -129,7 +146,7 @@ class BackupsCubit extends ServerInstallationDependendCubit<BackupsState> {
         return;
       } else {
         emit(state.copyWith(preventActions: false));
-        getIt<NavigationService>().showSnackBar('backup.reuploaded_key');
+        getIt<NavigationService>().showSnackBar('backup.reuploaded_key'.tr());
         await updateBackups();
       }
     }

lib/logic/cubit/server_installation/server_installation_cubit.dart

@@ -5,7 +5,9 @@ import 'package:easy_localization/easy_localization.dart';
 import 'package:equatable/equatable.dart';
 import 'package:selfprivacy/config/get_it_config.dart';
 import 'package:selfprivacy/logic/api_maps/graphql_maps/server_api/server_api.dart';
+import 'package:selfprivacy/logic/api_maps/rest_maps/backblaze.dart';
 import 'package:selfprivacy/logic/api_maps/tls_options.dart';
+import 'package:selfprivacy/logic/models/hive/backblaze_bucket.dart';
 import 'package:selfprivacy/logic/models/hive/backups_credential.dart';
 import 'package:selfprivacy/logic/models/callback_dialogue_branching.dart';
 import 'package:selfprivacy/logic/models/hive/server_details.dart';
@@ -199,8 +201,23 @@ class ServerInstallationCubit extends Cubit<ServerInstallationState> {
       applicationKey: applicationKey,
       provider: BackupsProviderType.backblaze,
     );
+    final BackblazeBucket? bucket;
     await repository.saveBackblazeKey(backblazeCredential);
     if (state is ServerInstallationRecovery) {
+      final configuration = await ServerApi(
+        customToken:
+            (state as ServerInstallationRecovery).serverDetails!.apiToken,
+        isWithToken: true,
+      ).getBackupsConfiguration();
+      if (configuration != null) {
+        try {
+          bucket = await BackblazeApi()
+              .fetchBucket(backblazeCredential, configuration);
+          await getIt<ApiConfigModel>().storeBackblazeBucket(bucket!);
+        } catch (e) {
+          print(e);
+        }
+      }
       finishRecoveryProcess(backblazeCredential);
       return;
     }