TF-3416 Handle download attachment in EML previewer on mobile

lib/features/email/presentation/controller/single_email_controller.dart

@@ -2059,6 +2059,8 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
             emlPreviewer: emlPreviewer,
             onMailtoDelegateAction: openMailToLink,
             onPreviewEMLDelegateAction: (uri) => _openEMLPreviewer(context, uri),
+            onDownloadAttachmentDelegateAction: (uri) =>
+                _downloadAttachmentInEMLPreview(context, uri),
           ),
         );
       },
@@ -2069,13 +2071,23 @@ class SingleEmailController extends BaseController with AppLoaderMixin {
     log('SingleEmailController::_openEMLPreviewer:uri = $uri');
     if (uri == null) return;
 
-    final blobId = uri.authority;
+    final blobId = uri.path;
     log('SingleEmailController::_openEMLPreviewer:blobId = $blobId');
     if (blobId.isEmpty) return;
 
     previewEMLFileAction(Id(blobId), AppLocalizations.of(context));
   }
 
+  Future<void> _downloadAttachmentInEMLPreview(BuildContext context, Uri? uri) async {
+    log('SingleEmailController::_downloadAttachmentInEMLPreview:uri = $uri');
+    if (uri == null) return;
+
+    final attachment = EmailUtils.parsingAttachmentByUri(uri);
+    if (attachment == null) return;
+
+    handleDownloadAttachmentAction(context, attachment);
+  }
+
   void handleMailToAttendees(CalendarOrganizer? organizer, List<CalendarAttendee>? attendees) {
     final listEmailAddressAttendees = attendees
       ?.map((attendee) => EmailAddress(attendee.name?.name, attendee.mailto?.mailAddress.value))

lib/features/email/presentation/extensions/attachment_extension.dart

@@ -1,6 +1,10 @@
+import 'package:core/data/constants/constant.dart';
 import 'package:core/presentation/extensions/media_type_extension.dart';
 import 'package:core/presentation/resources/image_paths.dart';
+import 'package:core/utils/platform_info.dart';
 import 'package:model/email/attachment.dart';
+import 'package:tmail_ui_user/main/routes/app_routes.dart';
+import 'package:tmail_ui_user/main/routes/route_utils.dart';
 
 extension AttachmentExtension on Attachment {
   String getIcon(ImagePaths imagePaths) => type?.getIcon(imagePaths, fileName: name) ?? imagePaths.icFileEPup;
@@ -8,4 +12,27 @@ extension AttachmentExtension on Attachment {
   bool get isPDFFile => type?.isPDFFile(fileName: name) ?? false;
 
   bool get isEMLFile => type?.isEMLFile ?? false;
+
+  String get hyperLink => isEMLFile ? emlLink : attachmentLink;
+
+  String get emlLink {
+    if (blobId == null) return '';
+
+    if (PlatformInfo.isWeb) {
+      return RouteUtils.createUrlWebLocationBar(
+        AppRoutes.emailEMLPreviewer,
+        previewId: blobId!.value,
+      ).toString();
+    } else if (PlatformInfo.isMobile) {
+      return '${Constant.emlPreviewerScheme}:${blobId!.value}';
+    } else {
+      return '';
+    }
+  }
+
+  String get attachmentLink {
+    if (blobId == null) return '';
+
+    return '${Constant.attachmentScheme}:${blobId!.value}?name=${name ?? ''}&size=${size?.value ?? ''}&type=${type?.mimeType ?? ''}';
+  }
 }

lib/features/email/presentation/utils/email_utils.dart

@@ -5,11 +5,15 @@ import 'package:core/utils/app_logger.dart';
 import 'package:core/utils/mail/mail_address.dart';
 import 'package:get/get_utils/src/get_utils/get_utils.dart';
 import 'package:dartz/dartz.dart';
+import 'package:http_parser/http_parser.dart';
 import 'package:jmap_dart_client/jmap/account_id.dart';
 import 'package:jmap_dart_client/jmap/core/capability/capability_identifier.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:jmap_dart_client/jmap/core/properties/properties.dart';
 import 'package:jmap_dart_client/jmap/core/session/session.dart';
+import 'package:jmap_dart_client/jmap/core/unsigned_int.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+import 'package:model/email/attachment.dart';
 import 'package:tmail_ui_user/features/email/domain/state/download_attachment_for_web_state.dart';
 import 'package:tmail_ui_user/features/email/presentation/model/email_unsubscribe.dart';
 import 'package:tmail_ui_user/features/thread/domain/constants/thread_constants.dart';
@@ -190,4 +194,24 @@ class EmailUtils {
     final mailtoLinks = extractMailtoLinksFromListPost(listPost);
     return extractRecipientsFromListMailtoLink(mailtoLinks);
   }
+
+  static Attachment? parsingAttachmentByUri(Uri uri) {
+    try {
+      final blobId = uri.path;
+      final queryParams = uri.queryParameters;
+      final name = queryParams['name'];
+      final size = queryParams['size'];
+      final type = queryParams['type'];
+      log('EmailUtils::parsingAttachmentByUri:blobId = $blobId | name = $name | size = $size | type = $type');
+      return Attachment(
+        blobId: Id(blobId),
+        name: name,
+        size: size?.isNotEmpty == true ? UnsignedInt(int.parse(size!)) : null,
+        type: type?.isNotEmpty == true ? MediaType.parse(type!) : null,
+      );
+    } catch (e) {
+      logError('EmailUtils::parsingAttachmentByUri:Exception = $e:');
+      return null;
+    }
+  }
 }