Mock Certbot Renewal in Python for Testing

import subprocess
import sys
from datetime import datetime, timedelta
from pathlib import Path


def renew_cert(domain: str, output_dir: str = "certs") -> str:
    """Simulate a Let's Encrypt renewal with mock certbot output."""
    out = Path(output_dir)
    out.mkdir(parents=True, exist_ok=True)

    cert_path = out / f"{domain}.pem"
    expiry = datetime.now() + timedelta(days=90)

    # Simulated certificate content
    cert_content = (
        f"-----BEGIN CERTIFICATE-----\n"
        f"MOCK-CERT-FOR-{domain}\n"
        f"EXPIRES:{expiry.isoformat()}\n"
        f"-----END CERTIFICATE-----\n"
    )

    # Write mock certificate (would be real cert from certbot)
    cert_path.write_text(cert_content)

    # Simulate certbot CLI output
    return (
        f"Saving debug log to /var/log/letsencrypt/letsencrypt.log\n"
        f"Renewing an existing certificate for {domain}\n"
        f"Successfully received certificate.\n"
        f"Certificate is saved at: {cert_path}\n"
        f"Certificate will expire on: {expiry.date()}\n"
        f"Renewal simulation complete."
    )


if __name__ == "__main__":
    # Prevent actual certbot call — use a fake domain for the mock
    print(renew_cert("example.com"))