Book form requests into your calendar with a Zoom link

from datetime import datetime, timedelta
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from clickruntime import on_event, credentials, http, notify

@on_event
def handle(event):
    r = event.json or {}
    start = datetime.fromisoformat(r["time"])
    end = start + timedelta(minutes=30)
    cal = build("calendar", "v3", credentials=Credentials(credentials.connection("google", "work")), cache_discovery=False)
    busy = cal.freebusy().query(body={"timeMin": start.isoformat(), "timeMax": end.isoformat(),
                                      "items": [{"id": "primary"}]}).execute()["calendars"]["primary"]["busy"]
    if busy:
        notify.email_me("Booking request clashes", f"{r['name']} ({r['email']}) asked for {r['time']}, but you're busy.")
        return {"booked": False}
    meeting = http.post("https://api.zoom.us/v2/users/me/meetings",
                        headers={"Authorization": f"Bearer {credentials.connection('zoom', 'work')}"},
                        json={"topic": f"Consultation: {r['name']}", "type": 2, "start_time": r["time"], "duration": 30}).json()
    cal.events().insert(calendarId="primary", sendUpdates="all",
                        body={"summary": f"Consultation: {r['name']}", "location": meeting["join_url"],
                              "start": {"dateTime": start.isoformat()}, "end": {"dateTime": end.isoformat()},
                              "attendees": [{"email": r["email"]}]}).execute()
    notify.slack(f"Booked: {r['name']} on {start:%a %d %b %H:%M}", channel="#bookings")
    return {"booked": True}