TF-32 Add domain layer of download attachment for android platform

model/lib/download/download_task_id.dart

@@ -0,0 +1,10 @@
+import 'package:equatable/equatable.dart';
+
+class DownloadTaskId with EquatableMixin {
+  final String taskId;
+
+  DownloadTaskId(this.taskId);
+
+  @override
+  List<Object> get props => [taskId];
+}

model/lib/email/attachment.dart

@@ -0,0 +1,41 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:http_parser/http_parser.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/core/unsigned_int.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_body_part.dart';
+import 'package:uri/uri.dart';
+
+class Attachment with EquatableMixin {
+
+  final PartId? partId;
+  final Id? blobId;
+  final UnsignedInt? size;
+  final String? name;
+  final MediaType? type;
+  final String? cid;
+
+  Attachment(
+    this.partId,
+    this.blobId,
+    this.size,
+    this.name,
+    this.type,
+    this.cid
+  );
+
+  String getDownloadUrl(String baseDownloadUrl, AccountId accountId) {
+    final downloadUriTemplate = UriTemplate('$baseDownloadUrl');
+    final downloadUri = downloadUriTemplate.expand({
+      'accountId' : '${accountId.id.value}',
+      'blobId' : '${blobId?.value}',
+      'name' : '$name',
+      'type' : '${type?.mimeType}',
+    });
+    return Uri.decodeFull(downloadUri);
+  }
+
+  @override
+  List<Object?> get props => [partId, blobId, size, name, type, cid];
+}

model/lib/extensions/session_extension.dart

@@ -1,16 +1,12 @@
 
 import 'package:jmap_dart_client/jmap/core/session/session.dart';
-import 'package:uri/uri.dart';
 
 extension SessionExtension on Session {
-
-  String getDownloadUrl(String accountId, String blobId, String name, String type) {
-    final downloadUriTemplate = UriTemplate('${downloadUrl.origin}');
-    return downloadUriTemplate.expand({
-      'accountId' : '$accountId',
-      'blobId' : '$blobId',
-      'name' : '$name',
-      'type' : '$type',
-    });
+  String getDownloadUrl() {
+    var baseUrl = '${downloadUrl.origin}${downloadUrl.path}';
+    if (baseUrl.endsWith('/')) {
+      baseUrl = baseUrl.substring(0, baseUrl.length - 1);
+    }
+    return Uri.decodeFull(baseUrl);
   }
 }

model/lib/model.dart

@@ -23,6 +23,7 @@ export 'email/email_action_type.dart';
 export 'email/presentation_email_address.dart';
 export 'email/email_address_cache.dart';
 export 'email/read_actions.dart';
+export 'email/attachment.dart';
 
 // Extensions
 export 'extensions/email_address_extension.dart';
@@ -34,3 +35,6 @@ export 'extensions/user_profile_extension.dart';
 export 'extensions/presentation_email_extension.dart';
 export 'extensions/keyword_identifier_extension.dart';
 export 'extensions/presentation_mailbox_extension.dart';
+
+// Download
+export 'download/download_task_id.dart';

model/pubspec.yaml

@@ -52,6 +52,9 @@ dependencies:
   # json_annotation
   json_annotation: 4.0.1
 
+  # http_parser
+  http_parser: 4.0.0
+
 dev_dependencies:
   flutter_test:
     sdk: flutter