Alert Slack when a Google shared drive file is deleted

from clickruntime import on_trigger, credentials, http, state, notify

DRIVE_ID = "0AbCdEfFinanceDriveId"
DRIVE_NAME = "Finance"
CHANNEL = "#it-alerts"

def g(path, **params):
    resp = http.get(f"https://www.googleapis.com/drive/v3{path}", params={**params, "supportsAllDrives": True},
                    headers={"Authorization": f"Bearer {credentials.connection('google', 'work')}"})
    resp.raise_for_status()
    return resp.json()

@on_trigger
def run(event):
    token = state.get("page_token")
    if token is None:
        state.set("page_token", g("/changes/startPageToken", driveId=DRIVE_ID)["startPageToken"])
        return {"baseline": True}
    removed = []
    while token:
        page = g("/changes", pageToken=token, driveId=DRIVE_ID, includeItemsFromAllDrives=True, includeRemoved=True,
                 fields="nextPageToken,newStartPageToken,changes(fileId,removed,file(name,mimeType,trashed,lastModifyingUser(displayName)))")
        for c in page["changes"]:
            f = c.get("file") or {}
            if c.get("removed") or f.get("trashed"):
                kind = " (folder)" if f.get("mimeType", "").endswith("folder") else ""
                who = (f.get("lastModifyingUser") or {}).get("displayName", "unknown")
                removed.append(f"• {f.get('name', c['fileId'])}{kind} · trashed by {who}")
        token = page.get("nextPageToken")
        if not token:
            state.set("page_token", page["newStartPageToken"])
    if removed:
        notify.slack(f"🗑 {len(removed)} file{'s' if len(removed) > 1 else ''} removed from shared drive \"{DRIVE_NAME}\"\n"
                     + "\n".join(removed[:40]) + "\nRestore from the shared drive's trash within 30 days.", channel=CHANNEL)
    return {"removed": len(removed)}