class_docstr: The default session interface that stores sessions in signed cookies
  through the :mod:`itsdangerous` module.
code: def open_session(
      self, app: Flask, request: Request
  ) -> SecureCookieSession | None:
      s = self.get_signing_serializer(app)
      if s is None:
          return None
      val = request.cookies.get(self.get_cookie_name(app))
      if not val:
          return self.session_class()
      max_age = int(app.permanent_session_lifetime.total_seconds())
      try:
          data = s.loads(val, max_age=max_age)
          return self.session_class(data)
      except BadSignature:
          return self.session_class()
  
imports: from __future__ import annotations
  import hashlib
  import typing
  from collections.abc import MutableMapping
  from datetime import datetime
  from datetime import timezone
  from itsdangerous import BadSignature
  from itsdangerous import URLSafeTimedSerializer
  from werkzeug.datastructures import CallbackDict
  from .json.tag import TaggedJSONSerializer
label_desc: Use image node_id 2 for calling the SecureCookieSessionInterface obj's underlying member method code with example usage: obj.open_session(app, request) and returns: None, self, self, self