TF-32 Add domain layer of export attachment for ios platform

lib/features/composer/presentation/composer_controller.dart

@@ -25,7 +25,6 @@ import 'package:tmail_ui_user/features/composer/domain/usecases/send_email_inter
 import 'package:tmail_ui_user/features/composer/presentation/extensions/email_action_type_extension.dart';
 import 'package:tmail_ui_user/features/email/presentation/constants/email_constants.dart';
 import 'package:tmail_ui_user/features/email/presentation/extensions/email_content_extension.dart';
-import 'package:tmail_ui_user/features/email/presentation/model/attachment_file.dart';
 import 'package:tmail_ui_user/features/email/presentation/model/composer_arguments.dart';
 import 'package:tmail_ui_user/features/email/presentation/model/message_content.dart';
 import 'package:tmail_ui_user/main/localizations/app_localizations.dart';

lib/features/email/domain/repository/email_repository.dart

@@ -1,3 +1,4 @@
+import 'package:dio/dio.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:model/model.dart';
@@ -16,4 +17,12 @@ abstract class EmailRepository {
     String baseDownloadUrl,
     AccountRequest accountRequest
   );
+
+  Future<String> exportAttachment(
+    Attachment attachment,
+    AccountId accountId,
+    String baseDownloadUrl,
+    AccountRequest accountRequest,
+    CancelToken cancelToken
+  );
 }

lib/features/email/domain/state/export_attachment_state.dart

@@ -0,0 +1,19 @@
+import 'package:core/core.dart';
+
+class ExportAttachmentSuccess extends UIState {
+  final String filePath;
+
+  ExportAttachmentSuccess(this.filePath);
+
+  @override
+  List<Object> get props => [filePath];
+}
+
+class ExportAttachmentFailure extends FeatureFailure {
+  final exception;
+
+  ExportAttachmentFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

lib/features/email/domain/usecases/download_attachments_interactor.dart

@@ -12,11 +12,11 @@ class DownloadAttachmentsInteractor {
 
   DownloadAttachmentsInteractor(this.emailRepository, this.credentialRepository);
 
-  Future<Either<Failure, Success>> execute(
+  Stream<Either<Failure, Success>> execute(
       List<Attachment> attachments,
       AccountId accountId,
       String baseDownloadUrl
-  ) async {
+  ) async* {
     try {
       final taskIds = await Future.wait(
           [credentialRepository.getUserName(), credentialRepository.getPassword()],
@@ -30,9 +30,9 @@ class DownloadAttachmentsInteractor {
             accountRequest);
       });
 
-      return Right<Failure, Success>(DownloadAttachmentsSuccess(taskIds));
+      yield Right<Failure, Success>(DownloadAttachmentsSuccess(taskIds));
     } catch (e) {
-      return Left<Failure, Success>(DownloadAttachmentsFailure(e));
+      yield Left<Failure, Success>(DownloadAttachmentsFailure(e));
     }
   }
 }

lib/features/email/domain/usecases/export_attachment_interactor.dart

@@ -0,0 +1,42 @@
+import 'dart:async';
+
+import 'package:core/core.dart';
+import 'package:dartz/dartz.dart';
+import 'package:dio/dio.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:model/model.dart';
+import 'package:tmail_ui_user/features/email/domain/repository/email_repository.dart';
+import 'package:tmail_ui_user/features/email/domain/state/export_attachment_state.dart';
+import 'package:tmail_ui_user/features/login/domain/repository/credential_repository.dart';
+
+class ExportAttachmentInteractor {
+  final EmailRepository emailRepository;
+  final CredentialRepository credentialRepository;
+
+  ExportAttachmentInteractor(this.emailRepository, this.credentialRepository);
+
+  Stream<Either<Failure, Success>> execute(
+      Attachment attachment,
+      AccountId accountId,
+      String baseDownloadUrl,
+      CancelToken cancelToken
+  ) async* {
+    try {
+      final filePath = await Future.wait(
+        [credentialRepository.getUserName(), credentialRepository.getPassword()],
+        eagerError: true
+      ).then((List responses) async {
+        final accountRequest = AccountRequest(responses.first, responses.last);
+        return await emailRepository.exportAttachment(
+            attachment,
+            accountId,
+            baseDownloadUrl,
+            accountRequest,
+            cancelToken);
+      });
+      yield Right<Failure, Success>(ExportAttachmentSuccess(filePath));
+    } catch (exception) {
+      yield Left<Failure, Success>(ExportAttachmentFailure(exception));
+    }
+  }
+}