class_docstr: Interact with Alibaba Cloud OSS, using the oss2 library.
class_docstr_tok: ["Interact","with","Alibaba","Cloud","OSS",",","using","the","oss2","library","."]
code: def get_default_region(self) -> str | None:
      extra_config = self.oss_conn.extra_dejson
      auth_type = extra_config.get("auth_type", None)
      if not auth_type:
          raise Exception("No auth_type specified in extra_config. ")
  
      if auth_type != "AK":
          raise Exception(f"Unsupported auth_type: {auth_type}")
  
      default_region = extra_config.get("region", None)
      if not default_region:
          raise Exception(
              f"No region is specified for connection: {self.oss_conn_id}"
          )
      return default_region
  
imports: from __future__ import annotations
  from functools import wraps
  from inspect import signature
  from typing import TYPE_CHECKING, Callable, TypeVar, cast
  from urllib.parse import urlsplit
  import oss2
  from oss2.exceptions import ClientError
  from airflow.exceptions import AirflowException
  from airflow.hooks.base import BaseHook
label_desc: Use image node_id 18 for calling the OSSHook obj's underlying member method code with example usage: obj.get_default_region() and returns: default_region