Mirrors/chatmail-core
1
0
Fork 0
mirror of https://github.com/chatmail/core.git synced 2026-04-28 02:46:29 +03:00
Code Issues Packages Projects Releases Wiki Activity

fix: prefer last part in multipart/alternative

Browse Source 
This is recommended by RFC 2046
and does not require a separate loop
looking for multipart subpart.
This commit is contained in:
link2xt
2025-10-01 05:56:09 +00:00
parent 33a127187b
commit af69756df0
2 changed files with 63 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
src/mimeparser.rs
View File

@@ -1072,47 +1072,35 @@ impl MimeMessage {
)?
.0;
match (mimetype.type_(), mimetype.subtype().as_str()) {
/* Most times, multipart/alternative contains true alternatives
as text/plain and text/html. If we find a multipart/mixed
inside multipart/alternative, we use this (happens eg in
apple mail: "plaintext" as an alternative to "html+PDF attachment") */
(mime::MULTIPART, "alternative") => {
for cur_data in &mail.subparts {
let mime_type = get_mime_type(
// multipart/alternative is described in
// <https://datatracker.ietf.org/doc/html/rfc2046#section-5.1.4>.
// Specification says that last part should be preferred,
// so we iterate over parts in reverse order.
// Search for plain text or multipart part.
//
// If we find a multipart inside multipart/alternative
// and it has usable subparts, we only parse multipart.
// This happens e.g. in Apple Mail:
// "plaintext" as an alternative to "html+PDF attachment".
for cur_data in mail.subparts.iter().rev() {
let (mime_type, _viewtype) = get_mime_type(
cur_data,
&get_attachment_filename(context, cur_data)?,
self.has_chat_version(),
)?
.0;
if mime_type == "multipart/mixed" || mime_type == "multipart/related" {
)?;
if mime_type == mime::TEXT_PLAIN || mime_type.type_() == mime::MULTIPART {
any_part_added = self
.parse_mime_recursive(context, cur_data, is_related)
.await?;
break;
}
}
if !any_part_added {
/* search for text/plain and add this */
for cur_data in &mail.subparts {
if get_mime_type(
cur_data,
&get_attachment_filename(context, cur_data)?,
self.has_chat_version(),
)?
.0
.type_()
== mime::TEXT
{
any_part_added = self
.parse_mime_recursive(context, cur_data, is_related)
.await?;
break;
}
}
}
if !any_part_added {
/* `text/plain` not found - use the first part */
for cur_part in &mail.subparts {
for cur_part in mail.subparts.iter().rev() {
if self
.parse_mime_recursive(context, cur_part, is_related)
.await?