signing_string_generator.py

import datetime

def create_signing_string(digest_base64, created=None, expires=None):
    if created is None:
        created = int(datetime.datetime.now().timestamp())
    if expires is None:
        expires = int((datetime.datetime.now() + datetime.timedelta(hours=1)).timestamp())
    signing_string = f"""(created): {created}
(expires): {expires}
digest: BLAKE-512={digest_base64}"""
    return signing_string