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from django import forms
from django.template.defaultfilters import filesizeformat
from django.utils.translation import ugettext_lazy as _
from django.core.exceptions import ValidationError
class RestrictedFileField(forms.FileField):
"""
Same as FileField, but you can specify:
* content_types - list containing allowed content_types. Example: ['application/pdf', 'image/jpeg']
* max_upload_size - a number indicating the maximum file size allowed for upload.
2.5MB - 2621440
5MB - 5242880
10MB - 10485760
20MB - 20971520
50MB - 5242880
100MB - 104857600
250MB - 214958080
500MB - 429916160
"""
def __init__(self, *args, **kwargs):
self.content_types = kwargs.pop("content_types")
self.max_upload_size = kwargs.pop("max_upload_size")
super().__init__(*args, **kwargs)
def clean(self, data, initial=None):
file = super().clean(data, initial)
try:
content_type = file.content_type
if content_type in self.content_types:
if file._size > self.max_upload_size:
raise ValidationError(_('Please keep filesize under %s. Current filesize %s') % (
filesizeformat(self.max_upload_size), filesizeformat(file._size)))
else:
raise ValidationError(_('Filetype not supported.'))
except AttributeError:
pass
return data