create_authorisation_header.py

import base64
import datetime
import os
import re
import json
import nacl.encoding
import nacl.hash
from nacl.bindings import crypto_sign_ed25519_sk_to_seed
from nacl.signing import SigningKey, VerifyKey

def create_authorisation_header(request_body=request_body_json,
                                created=os.getenv("CREATED",  "1641287875"),
                                expires=os.getenv("EXPIRES",  "1641291475")):
    signing_key = create_signing_string(hash_message(json.dumps(request_body, separators=(',', ':'))),
                                        created=created, expires=expires)
    signature = sign_response(signing_key, private_key=os.getenv("BPP_PRIVATE_KEY"))

    subscriber_id = os.getenv("SUBSCRIBER_ID", "your_subscriver_id")
    unique_key_id = os.getenv("UNIQUE_KEY_ID", "Your_unique_key")
    header = f'Signature keyId="{subscriber_id}|{unique_key_id}|ed25519",algorithm="ed25519",created=' \
             f'"{created}",expires="{expires}",headers="(created) (expires) digest",signature="{signature}"'
    return header