Pre/Post processing of the attachments (compression,virus-check,etc)

[florianseydoux@…]

I would be so happy if it was possible to specify some pre/post-storing processing, launched when a new attachment is made (to a ticket or a wiki) - and similarly, some pre-reading process, of course.

My goal is to save some disk-space on the server (ok, I know - disk are cheap now, but…) by doing a simple bzip on the attached files (and the reverse operation when the files are read)…
(users of my trac site have to regularly provide large logs with their tickets, but I can't ask them to do some compression before (specially with such strange things like bzip): they are not computer scientist, and they are quite impatient persons !)

But such feature can also be used for other purpose… like virus detection?

[Noah Kantrowitz]

Virus detection should already be possible with the same hooks the spam filter system uses. As for full inbound and outbound filtering, that may be a bit much.

[Christian Boos]

I think it's a good idea, we already have an IAttachmentManipulator interface where this could be added.

There's already a prepare_attachment method there, which is not yet used:

    def prepare_attachment(req, attachment, fields):
        """Not currently called, but should be provided for future
        compatibility."""

This could be replaced by:

    def encode_attachment(req, attachment, fileobj):
        """Filter in the `fileobj` before it gets written to the disk.
        Returns another file object (eventually `fileobj` if there's no encoding)
        """

    def decode_attachment(req, attachment, fileobj):
        """Filter out the `fileobj` to retrieve its initial unencoded form."""

[mmitar@…]

One other use for preprocessing would be an option when uploading attachments to automatically generate thumbnail versions of images uploaded. So system would have to be able to add multiple attachments with just one upload.

In this way also #2141 could be implemented.

[Christian Boos]

Milestone 2.0 deleted

[Mitar]

Ping? It would be great to have this functionality so that thumbnail versions of images would be possible. What is missing for this to be used?

[Christian Boos]

Milestone triaging deleted