Django CsvFileField

csv_file_field.py

import mimetypes
from django import forms
from django.core import validators

class CsvFileField(forms.FileField):
  def validate(self, value):
    super().validate(value)
    
    file_mime = mimetypes.guess_type(value)
    if file_mime != 'text/csv':
      raise validators.ValidationError(
        ('Invalid file type'),
        code='Invalide'
      )