TF-2602 Set charset for attachment with mimeType=text/plain when sent email on mobile

Signed-off-by: dab246 <tdvu@linagora.com>

model/lib/email/attachment.dart

@@ -20,6 +20,7 @@ class Attachment with EquatableMixin {
   final MediaType? type;
   final String? cid;
   final ContentDisposition? disposition;
+  final String? charset;
 
   Attachment({
     this.partId,
@@ -29,6 +30,7 @@ class Attachment with EquatableMixin {
     this.type,
     this.cid,
     this.disposition,
+    this.charset,
   });
 
   bool noCid() => cid == null || cid?.isEmpty == true;
@@ -59,7 +61,16 @@ class Attachment with EquatableMixin {
   }
 
   @override
-  List<Object?> get props => [partId, blobId, size, name, type, cid, disposition];
+  List<Object?> get props => [
+    partId,
+    blobId,
+    size,
+    name,
+    type,
+    cid,
+    disposition,
+    charset
+  ];
 }
 
 enum ContentDisposition {

model/lib/extensions/attachment_extension.dart

@@ -11,7 +11,7 @@ extension AttachmentExtension on Attachment {
     name: name,
     type: type,
     cid: cid,
-    charset: charset,
+    charset: charset ?? this.charset,
     disposition: disposition?.name ?? ContentDisposition.attachment.name);
 
   Attachment toAttachmentWithDisposition({
@@ -25,7 +25,8 @@ extension AttachmentExtension on Attachment {
         name: name,
         type: type,
         cid: cid ?? this.cid,
-        disposition: disposition ?? this.disposition
+        disposition: disposition ?? this.disposition,
+        charset: charset
     );
   }
 

model/lib/extensions/email_body_part_extension.dart

@@ -9,5 +9,6 @@ extension EmailBodyPartExtension on EmailBodyPart {
     name: name,
     type: type,
     cid: cid,
+    charset: charset,
     disposition: disposition.toContentDisposition());
 }

model/lib/upload/upload_response.dart

@@ -34,7 +34,13 @@ class UploadResponse with EquatableMixin  {
 }
 
 extension UploadResponseExtension on UploadResponse {
-  Attachment toAttachment(String nameFile) {
-    return Attachment(blobId: blobId, size: UnsignedInt(size), name: nameFile, type: type);
+  Attachment toAttachment({required String nameFile, String? charset}) {
+    return Attachment(
+      blobId: blobId,
+      size: UnsignedInt(size),
+      name: nameFile,
+      type: type,
+      charset: charset
+    );
   }
 }