fields.py 文件源码

def clean(self, *args, **kwargs):
        data = super(PrivateFileField, self).clean(*args, **kwargs)
        file = data.file
        if isinstance(file, UploadedFile):
            # content_type is only available for uploaded files,
            # and not for files which are already stored in the model.
            content_type = file.content_type

            if self.content_types and content_type not in self.content_types:
                logger.debug('Rejected uploaded file type: %s', content_type)
                raise ValidationError(self.error_messages['invalid_file_type'])

            if self.max_file_size and file.size > self.max_file_size:
                raise ValidationError(self.error_messages['file_too_large'].format(
                    max_size=filesizeformat(self.max_file_size),
                    size=filesizeformat(file.size)
                ))

        return data