code: def get_authorization(self):
          
          auth = get_authorization_header()
  
          if not auth:
              return None
  
          auth_type, auth_info = auth
  
          if auth_type != b'basic':
              return None
  
          try:
              username, password = base64.b64decode(auth_info).split(b':', 1)
          except Exception:
              return None
  
          return Authorization('basic', username=bytes_to_wsgi(username), password=bytes_to_wsgi(password))
docs: Get the username and password for Basic authentication header.
          :return Authentication: The authentication data or None if it is not present or invalid.