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File Mimetype Validator (Using python-magic)

Author:
BHSPitMonkey
Posted:
April 1, 2014
Language:
Python
Version:
Not specified
Score:
0 (after 0 ratings)

This validator works well with FileField form fields and can validate that an uploaded file has an acceptable mimetype. Place this snippet in your app's validators.py.

Requirements:

This snippet uses python-magic. To install:

pip install python-magic

Usage (in forms.py):

from validators import MimetypeValidator

class MyForm(forms.Form):
    file = forms.FileField(
        allow_empty_file=False,
        validators=[MimetypeValidator('application/pdf')],
        help_text="Upload a PDF file"
    )

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from django.core.exceptions import ValidationError
import magic


class MimetypeValidator(object):
	def __init__(self, mimetypes):
		self.mimetypes = mimetypes
	
	def __call__(self, value):
		try:
			mime = magic.from_buffer(value.read(1024), mime=True)
			if not mime in self.mimetypes:
				raise ValidationError('%s is not an acceptable file type' % value)
		except AttributeError as e:
			raise ValidationError('This value could not be validated for file type' % value)

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