Send new clients a shared Drive folder and welcome email

import base64
from email.message import EmailMessage
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from clickruntime import on_event, credentials, state

PARENT_ID, TEMPLATE_ID = "your-clients-folder-id", "your-template-folder-id"

@on_event
def handle(event):
    if state.get(event.event_id):
        return {"skipped": True}
    c = event.event
    creds = Credentials(credentials.connection("google", "work"))
    drive = build("drive", "v3", credentials=creds, cache_discovery=False)
    folder = drive.files().create(body={"name": c["company"], "parents": [PARENT_ID], "mimeType": "application/vnd.google-apps.folder"},
                                  fields="id,webViewLink").execute()
    for f in drive.files().list(q=f"'{TEMPLATE_ID}' in parents and trashed=false", fields="files(id,name)").execute()["files"]:
        drive.files().copy(fileId=f["id"], body={"name": f["name"], "parents": [folder["id"]]}).execute()
    drive.permissions().create(fileId=folder["id"], body={"type": "user", "role": "writer", "emailAddress": c["email"]},
                               sendNotificationEmail=False).execute()
    msg = EmailMessage()
    msg["To"], msg["Subject"] = c["email"], f"Welcome, {c['company']}"
    msg.set_content(f"Hi {c.get('name', '')},\n\nWelcome aboard. Your shared folder is ready: {folder['webViewLink']}\n")
    build("gmail", "v1", credentials=creds, cache_discovery=False).users().messages().send(
        userId="me", body={"raw": base64.urlsafe_b64encode(msg.as_bytes()).decode()}).execute()
    state.set(event.event_id, folder["id"])
    return {"folder": folder["id"]}