okex_v3_sign.py

import base64
import datetime
import hmac


def get_timestamp() -> str:
    """
    The OKEX api requires the timestamp to be in exactly this format

    example: '2018-10-23T17:27:40.340Z'
    """
    now = datetime.datetime.utcnow()
    return now.strftime('%Y-%m-%dT%H:%M:%S') + now.strftime('.%f')[:4] + 'Z'

def make_signature(timestamp: str, method: str, request_path: str,
                   body: Optional[str], secret_key: str) -> str:
    body = body or ''
    message = timestamp + method.upper() + request_path + body
    mac = hmac.new(secret_key.encode('utf-8'), message.encode('utf-8'),
                   digestmod='sha256')
    d = mac.digest()
    return base64.b64encode(d).decode('utf-8')