Attching a zip file file produces "Warning! Not all atthacments have been uploaded" error

[alyandon]

Describe the bug
I'm unable to attach .zip files that are well under the threshold for PHP max file upload. It seems to be something specific to the .zip file extension as I have no problems attaching large pictures (.png, .jpg) and archives that are anything but .zip (.rar, .7z).

To Reproduce
Steps to reproduce the behavior:

1. Create a text file (test.txt)
2. Add some text to it (e.g. abc123)
3. Add test.txt to a zip file using utility of choice
4. Create a new email
5. Attempt to attach zip file to email
6. Notice that the attachment filename is red which indicates an error.
7. Attempt to send the email gets the ""Warning! Not all atthacments have been uploaded" error.

Expected behavior
Snappy mail should send the email or give a very specific reason as to why the attachment failed to upload.

Screenshots

Please complete the following information:

• Browser: Firefox 135b02
• unknown - IMAP is hosted service at ionos
• PHP version: 8.1-fpm
• SnappyMail Version: 2.38.2
• Mode: standalone

Debug/logging information
No errors appear in nginx PHP logs or in snappy mail application logs.
Browser console window does show a "Error: Attempt to postMessage on disconnected port" error but that doesn't really seem important.

Additional context
Really at the end of my rope trying to figure this out as as usually errors show up in either the console or the server logs. This seems suspiciously like the client side snappymail app is trying to peek inside or otherwise interpret files with a .zip extension instead of treating them like an opaque binary blob.

[alyandon]

On a hunch, I enabled debug logging and this turned out to be the result of the php-zip package not being installed. The error is "Class ZipArchive not found".

This is still a problem because:

1. Why does snappymail care about .zip at all vs any other opaque binary blob I might attach to an email?
2. My default logging level is set to Warning (4) which should still show errors

[alyandon]

This is likely the culprit:

snappymail/snappymail/v/0.0.0/app/libraries/snappymail/file/mimetype.php

Line 46 in 8bf4727

$zip = new \ZipArchive();

Looks like it needs a class_exists('ZipArchive') check like all the other spots ZipArchive is used?

[alyandon]

And it looks like the class not found error is getting wrapped and returned as an INFO level message. That explains why it wasn't showing up in my logs.