code: def initiate_flow(self, redirect_uri: str) -> dict:
      flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
          self._credentials_file, scopes=GoogleFlow.scopes, state=None
      )
      flow.redirect_uri = redirect_uri
      authorization_url, state = flow.authorization_url(
          access_type="offline", include_granted_scopes="true"
      )
  
      return {
          "authorization_url": authorization_url,
          "redirect_uri": redirect_uri,
          "state": state,
      }
  
imports: import abc
  import base64
  from cryptography import x509
  from cryptography.hazmat.primitives import serialization
  import json
  import logging
  import os
  import urllib.parse
  from typing import Any, Dict, List, Mapping, Optional, TypedDict, ClassVar
  import aiohttp.web
  import google.auth.transport.requests
  import google.oauth2.id_token
  import google_auth_oauthlib.flow
  import jwt
  import msal
  from hailtop import httpx
  from hailtop.utils import retry_transient_errors
label_desc: Use image node_id 3 for calling the GoogleFlow obj's underlying member method code with example usage: obj.initiate_flow(redirect_uri) and returns: dict