Monitor your sites and SSL certificates with Telegram alerts

import socket, ssl
from datetime import datetime, timezone
from clickruntime import on_trigger, credentials, http, state, notify
SITES = ["shop.example.com", "www.example.org"]
CHAT_ID = "your-chat-id"
def alert(text):
    http.post(f"https://api.telegram.org/bot{credentials.secret('TELEGRAM_BOT_TOKEN')}/sendMessage", json={"chat_id": CHAT_ID, "text": text})
    notify.email_me(text[:200], text)
@on_trigger
def run(event):
    status = state.get("status") or {}
    for host in SITES:
        try:
            up = http.get(f"https://{host}", timeout=10).status_code < 500
        except Exception:
            up = False
        if host in status and status[host] != up:
            alert(f"{host} is {'back up' if up else 'DOWN'}")
        status[host] = up
    today = datetime.now(timezone.utc).date().isoformat()
    if state.get("ssl_checked") != today:
        for host in SITES:
            with ssl.create_default_context().wrap_socket(socket.create_connection((host, 443), timeout=10), server_hostname=host) as s:
                expires = datetime.strptime(s.getpeercert()["notAfter"], "%b %d %H:%M:%S %Y %Z").replace(tzinfo=timezone.utc)
            days = (expires - datetime.now(timezone.utc)).days
            if days <= 14:
                alert(f"SSL certificate for {host} expires in {days} days")
        state.set("ssl_checked", today)
    state.set("status", status)
    return {"checked": len(SITES)}