from django import forms
[docs]class ExtFileField(forms.FileField):
"""
https://djangosnippets.org/snippets/977/
Same as forms.FileField, but you can specify a file extension whitelist.
>>> from django.core.files.uploadedfile import SimpleUploadedFile
>>>
>>> t = ExtFileField(ext_whitelist=(".pdf", ".txt"))
>>>
>>> t.clean(SimpleUploadedFile('filename.pdf', 'Some File Content'))
>>> t.clean(SimpleUploadedFile('filename.txt', 'Some File Content'))
>>>
>>> t.clean(SimpleUploadedFile('filename.exe', 'Some File Content'))
Traceback (most recent call last):
...
ValidationError: [u'Not allowed filetype!']
"""
def __init__(self, *args, **kwargs):
ext_whitelist = kwargs.pop("ext_whitelist")
self.ext_whitelist = [i.lower() for i in ext_whitelist]
super(ExtFileField, self).__init__(*args, **kwargs)
[docs] def clean(self, *args, **kwargs):
data = super(ExtFileField, self).clean(*args, **kwargs)
filename = data.name
ext = os.path.splitext(filename)[1]
ext = ext.lower()
if ext not in self.ext_whitelist:
raise forms.ValidationError("Not allowed filetype!")