How to implement OCSP stapling mock in Python

import hashlib
import time

class OCSPStapler:
    def __init__(self, cert_serial: str, issuer_hash: str):
        self.cert_serial = cert_serial
        self.issuer_hash = issuer_hash
        self.cache = {}

    def _mock_query_ocsp(self, serial: str) -> dict:
        """Simulate OCSP responder lookup."""
        digest = hashlib.sha256(serial.encode()).hexdigest()[:8]
        statuses = ["good", "revoked", "unknown"]
        return {
            "status": statuses[int(digest, 16) % 3],
            "this_update": int(time.time()),
            "next_update": int(time.time()) + 3600
        }

    def staple_response(self) -> dict:
        """Return a stapled OCSP response, caching for efficiency."""
        now = int(time.time())
        cached = self.cache.get(self.cert_serial)
        if cached and cached["next_update"] > now:
            return {**cached, "cached": True}

        response = self._mock_query_ocsp(self.cert_serial)
        response["cached"] = False
        self.cache[self.cert_serial] = response
        return response


if __name__ == "__main__":
    stapler = OCSPStapler(
        cert_serial="0A1B2C3D4E5F",
        issuer_hash="abcdef0123456789"
    )
    for _ in range(3):
        result = stapler.staple_response()
        print(f"Status: {result['status']}, cached: {result['cached']}, next_update: {result['next_update']}")