text: # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  
  import json
  from typing import Optional, Dict, Any, Union
  
  import yandexcloud
  
  from airflow.exceptions import AirflowException
  from airflow.hooks.base_hook import BaseHook
  
  
  class YandexCloudBaseHook(BaseHook):
      """
      A base hook for Yandex.Cloud related tasks.
  
      :param connection_id: The connection ID to use when fetching connection info.
      :type connection_id: str
      """
  
      def __init__(
          self,
          connection_id: Optional[str] = None,
          default_folder_id: Union[dict, bool, None] = None,
          default_public_ssh_key: Optional[str] = None,
      ) -> None:
          super().__init__()
          self.connection_id = connection_id or 'yandexcloud_default'
          self.connection = self.get_connection(self.connection_id)
          self.extras = self.connection.extra_dejson
          credentials = self._get_credentials()
          self.sdk = yandexcloud.SDK(**credentials)
          self.default_folder_id = default_folder_id or self._get_field('folder_id', False)
          self.default_public_ssh_key = default_public_ssh_key or self._get_field('public_ssh_key', False)
          self.client = self.sdk.client
  
      def _get_credentials(self) -> Dict[str, Any]:
          service_account_json_path = self._get_field('service_account_json_path', False)
          service_account_json = self._get_field('service_account_json', False)
          oauth_token = self._get_field('oauth', False)
          if not (service_account_json or oauth_token or service_account_json_path):
              raise AirflowException(
                  'No credentials are found in connection. Specify either service account '
                  + 'authentication JSON or user OAuth token in Yandex.Cloud connection'
              )
          if service_account_json_path:
              with open(service_account_json_path) as infile:
                  service_account_json = infile.read()
          if service_account_json:
              service_account_key = json.loads(service_account_json)
              return {'service_account_key': service_account_key}
          else:
              return {'token': oauth_token}
  
      def _get_field(self, field_name: str, default: Any = None) -> Any:
          """
          Fetches a field from extras, and returns it.
          """
          long_f = f'extra__yandexcloud__{field_name}'
          if hasattr(self, 'extras') and long_f in self.extras:
              return self.extras[long_f]
          else:
              return default
  