TF-296 Fix download file on browser

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

@@ -27,6 +27,13 @@ abstract class EmailRepository {
     CancelToken cancelToken
   );
 
+  Future<bool> downloadAttachmentForWeb(
+    Attachment attachment,
+    AccountId accountId,
+    String baseDownloadUrl,
+    AccountRequest accountRequest,
+  );
+
   Future<List<EmailId>> moveToMailbox(AccountId accountId, MoveRequest moveRequest);
 
   Future<List<Email>> markAsStar(

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

@@ -0,0 +1,18 @@
+import 'package:core/core.dart';
+
+class DownloadAttachmentForWebSuccess extends UIState {
+
+  DownloadAttachmentForWebSuccess();
+
+  @override
+  List<Object> get props => [];
+}
+
+class DownloadAttachmentForWebFailure extends FeatureFailure {
+  final exception;
+
+  DownloadAttachmentForWebFailure(this.exception);
+
+  @override
+  List<Object> get props => [exception];
+}

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

@@ -0,0 +1,39 @@
+import 'dart:async';
+
+import 'package:core/core.dart';
+import 'package:dartz/dartz.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/download_attachment_for_web_state.dart';
+import 'package:tmail_ui_user/features/login/domain/repository/credential_repository.dart';
+
+class DownloadAttachmentForWebInteractor {
+  final EmailRepository emailRepository;
+  final CredentialRepository credentialRepository;
+
+  DownloadAttachmentForWebInteractor(this.emailRepository, this.credentialRepository);
+
+  Stream<Either<Failure, Success>> execute(Attachment attachment, AccountId accountId, String baseDownloadUrl,) async* {
+    try {
+      final result = await Future.wait(
+        [credentialRepository.getUserName(), credentialRepository.getPassword()],
+        eagerError: true
+      ).then((List responses) async {
+        final accountRequest = AccountRequest(responses.first, responses.last);
+        return await emailRepository.downloadAttachmentForWeb(
+            attachment,
+            accountId,
+            baseDownloadUrl,
+            accountRequest);
+      });
+      if (result) {
+        yield Right<Failure, Success>(DownloadAttachmentForWebSuccess());
+      } else {
+        yield Left<Failure, Success>(DownloadAttachmentForWebFailure(null));
+      }
+    } catch (exception) {
+      yield Left<Failure, Success>(DownloadAttachmentForWebFailure(exception));
+    }
+  }
+}