Get pinged when a Box task is assigned to you

import base64, hashlib, hmac
from clickruntime import on_event, notify, http, credentials

MY_LOGIN = "me@example.com"  # your Box login

@on_event
def handle(event):
    key = credentials.secret("BOX_WEBHOOK_PRIMARY_KEY").encode()
    digest = hmac.new(key, event.body.encode() + event.header("box-delivery-timestamp").encode(), hashlib.sha256).digest()
    if not hmac.compare_digest(base64.b64encode(digest).decode(), event.header("box-signature-primary") or ""):
        return {"posted": False, "reason": "bad signature"}
    assignment = event.json["source"]
    if event.json.get("trigger") != "TASK_ASSIGNMENT.CREATED" or assignment["assigned_to"]["login"] != MY_LOGIN:
        return {"posted": False}
    file = assignment["item"]
    tasks = http.get(f"https://api.box.com/2.0/files/{file['id']}/tasks", headers={
        "Authorization": "Bearer " + credentials.connection("box", "main")}).json()["entries"]
    task = next((t for t in tasks if any(a["id"] == assignment["id"] for a in t["task_assignment_collection"]["entries"])), {})
    due = (task.get("due_at") or "no due date")[:10]
    notify.slack(f"Box task: {task.get('message', 'Review')} (due {due})\n{file['name']}: https://app.box.com/file/{file['id']}", channel="U012ABCDEF")  # your Slack member id
    return {"posted": True}