Only accept a certain file type in FileField, server-side

Question

How can I restrict FileField to only accept a certain type of file (video, audio, pdf, etc.) in an elegant way, server-side?

Answer 1

You can define a list of accepted mime types in settings and then define a validator which uses python-magic to detect the mime-type and raises ValidationError if the mime-type is not accepted. Set that validator on the file form field.

The only problem is that sometimes the mime type is application/octet-stream, which could correspond to different file formats. Did someone of you overcome this issue?