https://bugs.kde.org/show_bug.cgi?id=368003
Bug ID: 368003
Summary: CATENATE might produce invalid MIME messages
Product: trojita
Version: git
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Message Composer
Assignee: trojita-b...@kde.org
Reporter: j...@kde.org
When using drag-and-drop to attach a part stored on an IMAP server, the
composer migh produce malformed MIME messages if CATENATE is available and
used.
ImapPartAttachmentItem::suggestedCTE() makes this easy to see because it
hardcodes "Content-Transfer-Encoding: base64" for anything but message/rfc822.
So when attaching something like message/delivery-status or essentially
anything which is stored without any CTE on the IMAP server, Trojita's composer
writes out a CTE header which identifies the content as base64-encoded. When it
comes to adding the actual data, Trojita uses an IMAP URL mechanism which
points to a raw MIME part as-is, which in this case means a part stored with no
CTE which in turns is 7bit.
One approach at fixing this is to use the CTE header from the IMAP server, and
to hope that the original message was not malformed. This, however, might cause
trouble if we are about to send a message which is, say, in CTE: 8bit over an
SMTP server which does not support the CTE: 8bit. In that case, we will have to
transcode that part. If we are transcoding, there's a question on how a copy of
message which we are storing to the sent mailbox should look like -- either it
can use the most-efficient format, the CTE: 8bit, saving both bandwidth and
disk space, or it should match the outgoing message exactly, bite-wise, which
means that it must not use CATENATE in that case. Stuff gets messy because
right now, we prepare the full MIME structure beforehand, before even
connecting to the SMTP server which makes a lot of sense due to BURL. Maybe we
should detect that we cannot submit our message in this way, remove the
previously stored copy, upload a new one with no CTE: 8bit et al, and then use
this new 7bit version as an outgoing message in that case...
Or TL;DR, just disable CATENATE for now?
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