When I tried to merge this into my custom Szurubooru fork, I couldn't figure out how to allow my own custom filetype.

I'm wondering if this PR could help me allow arbitrary binary files with a specific set of possible extensions. (.nodes, .stknds, and .nodemc)

I understand that they wouldn't be preview-able, but I would like to allow them nonetheless.

@sticknuder Sorry for late answer, but I hadn't visited this PR in a while.

No, I'm afraid this PR won't help you with implementing this kind of functionality. It adds option to restrict file types that are allowed on a given szurubooru instance, but it doesn't extend the file format support in szurubooru itself. Adding such support may be tricky, since szurubooru seem to throw an error in func.posts.update_post_content if new post isn't an image, video or flash animation. I suppose one would need to code the handling of such generic types as you describe.

@pbf thanks for the response, but don't worry in the end I was able to do it 😁👍