TF-825 Download email as EML file (#2854)

model/lib/email/attachment.dart

@@ -44,8 +44,8 @@ class Attachment with EquatableMixin {
     final downloadUri = downloadUriTemplate.expand({
       'accountId' : accountId.id.value,
       'blobId' : '${blobId?.value}',
-      'name' : '$name',
-      'type' : '${type?.mimeType}',
+      'name' : name ?? '',
+      'type' : type?.mimeType ?? '',
     });
     return Uri.decodeFull(downloadUri);
   }

model/lib/email/email_action_type.dart

@@ -27,5 +27,6 @@ enum EmailActionType {
   unsubscribe,
   composeFromUnsubscribeMailtoLink,
   archiveMessage,
-  printAll
+  printAll,
+  downloadMessageAsEML
 }

model/lib/email/email_property.dart

@@ -1,6 +1,7 @@
 
 class EmailProperty {
   static const String id = 'id';
+  static const String blobId = 'blobId';
   static const String keywords = 'keywords';
   static const String size = 'size';
   static const String receivedAt = 'receivedAt';

model/lib/email/eml_attachment.dart

@@ -0,0 +1,15 @@
+
+import 'package:model/email/attachment.dart';
+
+class EMLAttachment extends Attachment {
+
+  EMLAttachment({
+    super.partId,
+    super.blobId,
+    super.size,
+    super.name,
+    super.type,
+    super.cid,
+    super.disposition,
+  });
+}

model/lib/email/presentation_email.dart

@@ -1,6 +1,7 @@
 
 import 'package:core/presentation/extensions/string_extension.dart';
 import 'package:equatable/equatable.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/core/utc_date.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
@@ -21,6 +22,7 @@ import 'package:model/mailbox/select_mode.dart';
 class PresentationEmail with EquatableMixin {
 
   final EmailId? id;
+  final Id? blobId;
   final Map<KeyWordIdentifier, bool>? keywords;
   final UnsignedInt? size;
   final UTCDate? receivedAt;
@@ -44,6 +46,7 @@ class PresentationEmail with EquatableMixin {
 
   PresentationEmail({
     this.id,
+    this.blobId,
     this.keywords,
     this.size,
     this.receivedAt,
@@ -142,6 +145,7 @@ class PresentationEmail with EquatableMixin {
   @override
   List<Object?> get props => [
     id,
+    blobId,
     keywords,
     size,
     receivedAt,

model/lib/extensions/email_extension.dart

@@ -67,6 +67,7 @@ extension EmailExtension on Email {
   Email updatedEmail({Map<KeyWordIdentifier, bool>? newKeywords, Map<MailboxId, bool>? newMailboxIds}) {
     return Email(
       id: id,
+      blobId: blobId,
       keywords: newKeywords ?? keywords,
       size: size,
       receivedAt: receivedAt,
@@ -91,6 +92,7 @@ extension EmailExtension on Email {
   PresentationEmail toPresentationEmail({SelectMode selectMode = SelectMode.INACTIVE}) {
     return PresentationEmail(
       id: id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -113,6 +115,7 @@ extension EmailExtension on Email {
   Email combineEmail(Email newEmail, Properties updatedProperties) {
     return Email(
       id: newEmail.id,
+      blobId: updatedProperties.contain(EmailProperty.blobId) ? newEmail.blobId : blobId,
       keywords: updatedProperties.contain(EmailProperty.keywords) ? newEmail.keywords : keywords,
       size: updatedProperties.contain(EmailProperty.size) ? newEmail.size : size,
       receivedAt: updatedProperties.contain(EmailProperty.receivedAt) ? newEmail.receivedAt : receivedAt,
@@ -171,6 +174,7 @@ extension EmailExtension on Email {
   ) {
     return PresentationEmail(
       id: emailId ?? id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,

model/lib/extensions/presentation_email_extension.dart

@@ -1,14 +1,17 @@
 import 'dart:ui';
 
+import 'package:core/data/constants/constant.dart';
 import 'package:core/domain/extensions/datetime_extension.dart';
 import 'package:core/presentation/extensions/color_extension.dart';
 import 'package:core/utils/app_logger.dart';
+import 'package:http_parser/http_parser.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:dartz/dartz.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
 import 'package:model/email/email_action_type.dart';
+import 'package:model/email/eml_attachment.dart';
 import 'package:model/email/presentation_email.dart';
 import 'package:model/extensions/email_address_extension.dart';
 import 'package:model/extensions/list_email_address_extension.dart';
@@ -44,6 +47,7 @@ extension PresentationEmailExtension on PresentationEmail {
   PresentationEmail toggleSelect() {
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -67,6 +71,7 @@ extension PresentationEmailExtension on PresentationEmail {
   PresentationEmail toSelectedEmail({required SelectMode selectMode}) {
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -90,6 +95,7 @@ extension PresentationEmailExtension on PresentationEmail {
   Email toEmail() {
     return Email(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -146,6 +152,7 @@ extension PresentationEmailExtension on PresentationEmail {
 
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -182,6 +189,7 @@ extension PresentationEmailExtension on PresentationEmail {
   PresentationEmail withRouteWeb(Uri routeWeb) {
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -205,6 +213,7 @@ extension PresentationEmailExtension on PresentationEmail {
   PresentationEmail updateKeywords(Map<KeyWordIdentifier, bool>? newKeywords) {
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: newKeywords,
       size: size,
       receivedAt: receivedAt,
@@ -228,6 +237,7 @@ extension PresentationEmailExtension on PresentationEmail {
   PresentationEmail syncPresentationEmail({PresentationMailbox? mailboxContain, Uri? routeWeb}) {
     return PresentationEmail(
       id: this.id,
+      blobId: blobId,
       keywords: keywords,
       size: size,
       receivedAt: receivedAt,
@@ -262,4 +272,12 @@ extension PresentationEmailExtension on PresentationEmail {
 
     return false;
   }
+
+  EMLAttachment createEMLAttachment() {
+    return EMLAttachment(
+      blobId: blobId,
+      name: getEmailTitle().isEmpty ? '${blobId?.value}.eml' : '${getEmailTitle()}.eml',
+      type: MediaType.parse(Constant.octetStreamMimeType)
+    );
+  }
 }