text: import json
  import getpass
  import logging
  from uuid import uuid4 as uuid
  from ring_doorbell import Ring, Auth
  from pathlib import Path
  import traceback
  
  
  class RingSession:
      """
      Starts a Ring session. Create a cache file and pass it into this class. On first run, use your user/password/token (I verified from the app)
      to log in. Once you have a token, you will re-use the token from the cache file to establish new sessions.
      """
  
      def __init__(self, cache_file):
          self.cache_file = cache_file
          self.ring = None
          logging.basicConfig(format='%(asctime)s\t%(levelname)s\t%(message)s',
                          datefmt='%Y-%d-%m %H:%M:%S', filename='server.log', level=logging.INFO)
  
      def get_doorbot_by_id(self, id: str):
          if self.ring == None:
              return
          devices = self.ring.devices()
          for device in devices['doorbots'] or []:
              if str(device.id) == id:
                  return device
          return None
  
      def take_screenshot(self, device_id: str):
          if self.ring == None:
              return
          device = self.get_doorbot_by_id(device_id)
          if device != None:
              device.get_snapshot(retries=3, delay=2, filename="last_screenshot.jpg")
      
      def get_battery_life(self, device_id: str):
          if self.ring == None:
              return None
          device = self.get_doorbot_by_id(device_id)
          if device != None:
              return device.battery_life
          return None
      
      def hardware_id(self, hwp) -> str:
          if hwp.is_file():
              return str(hwp.read_text())
          else:
              uid = str(uuid())
              hwp.write_text(uid)
              return uid
  
      def token_updater(self, token):
          """Write to the cache file to update with the latest refresh token. Used by the Auth class"""
          token['scope'] = "client" # I overwrote this because other API's use "client" instead of ["client"]
          self.cache_file.write_text(json.dumps(token))
  
      def create_ring(self):
          """Authenticates your user and returns a Ring instance to be queried further."""
          if self.cache_file.is_file():
              auth = Auth("android:com.ringapp",
                          json.loads(self.cache_file.read_text()), self.token_updater, self.hardware_id(Path('hw_id.cache')))
          else:
              username = input("user: ")
              password = getpass.getpass("password: ")
              token = input("2FA code: ")
              auth = Auth("android:com.ringapp", None, self.token_updater, self.hardware_id(Path('hw_id.cache')))
              try:
                  auth.fetch_token(username, password, token)
              except:
                  logging.error("Problem fetching token from input authorization.")
                  quit()
  
          ring = Ring(auth)
          if ring.session is None:
              try:
                  ring.create_session()
              except:
                  print(traceback.format_exc())
                  logging.error("Authorization error - token likely expired.")
                  quit()
          self.ring = ring
  