validators.py 文件源码

def __call__(self, value):
        # Check the content type
        mimetype = magic.from_buffer(value.read(1024), mime=True)
        if self.allowed_mimetypes and mimetype not in self.allowed_mimetypes:
            message = self.mime_message % {
                'mimetype': mimetype,
                'allowed_mimetypes': ', '.join(self.allowed_mimetypes)
            }
            raise ValidationError(message)