We'll replace this primarily with per-realm quotas (plus the simple
per-file limit of settings.MAX_FILE_UPLOAD_SIZE, 25 MiB by default).
We do want per-user quotas too, but they'll need some more management
apparatus around them so an admin has a practical way to set them
differently for different users. And the error handling in this
existing code is rather confused. Just clear this feature out
entirely for now; then we'll build the per-realm version more cleanly,
and then we can later add back per-realm quotas modelled after that.
The migration to actually remove the field is in a subsequent commit.
Based in part on work by Vishnu Ks (hackerkid).
This is a remerge of e985b57259 (after
resolving merge conflicts, updating the tests, adding mypy annotations
etc.), which should now be correct, because we've done the necessary
database migration.
The rebase/remerge work was done by Tim Abbott and Aditya Bansal.
This is an important part of #320.
This reverts commit e985b57259.
This commit will break production when we next do a release, because
we haven't done a migration to create Attachment objects for
previously uploaded files.
Previously, uploaded files were served:
* With S3UploadBackend, via get_uploaded_file (redirects to S3)
* With LocalUploadBackend in production, via nginx directly
* With LocalUploadBackend in development, via Django's static file server
This changes that last case to use get_uploaded_file in development,
which is a key step towards being able to do proper access control
authorization.
Does not affect production.