Downloads and saves a image from url into a file.

def generate_image_from_url(url=None, timeout=30):
    """
    Downloads and saves a image from url into a file.
    """

    file_name = posixpath.basename(url)
    img_tmp = NamedTemporaryFile(delete=True)

    try:
        response = requests.get(url, timeout=timeout)
        response.raise_for_status()
    except Exception as e:  # NOQA
        return None, None

    img_tmp.write(response.content)
    img_tmp.flush()

    image = File(img_tmp)
    image.seek(0)

    return file_name, image