kaxil commented on a change in pull request #9639: URL: https://github.com/apache/airflow/pull/9639#discussion_r452664124
########## File path: airflow/providers/microsoft/azure/secrets/azure_key_vault.py ########## @@ -0,0 +1,131 @@ +# 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. +from typing import Optional + +from azure.core.exceptions import ResourceNotFoundError +from azure.identity import DefaultAzureCredential +from azure.keyvault.secrets import SecretClient +from cached_property import cached_property + +from airflow.secrets import BaseSecretsBackend +from airflow.utils.log.logging_mixin import LoggingMixin + + +class AzureKeyVaultBackend(BaseSecretsBackend, LoggingMixin): + """ + Retrieves Airflow Connections or Variables from Azure Key Vault secrets. + + The Azure Key Vault can be configred as a secrets backend in the ``airflow.cfg``: + + .. code-block:: ini + + [secrets] + backend = airflow.providers.microsoft.azure.secrets.azure_key_vault.AzureKeyVaultBackend + backend_kwargs = {"connections_prefix": "airflow-connections", "vault_url": "<azure_key_vault_uri>"} + + For example, if the secrets prefix is ``airflow-connections-smtp-default``, this would be accessible + if you provide ``{"connections_prefix": "airflow-connections"}`` and request conn_id ``smtp-default``. + And if variables prefix is ``airflow-variables-hello``, this would be accessible + if you provide ``{"variables_prefix": "airflow-variables"}`` and request variable key ``hello``. + + :param vault_url: The URL of an Azure Key Vault to use + :type vault_url: str + :param connections_prefix: Specifies the prefix of the secret to read to get Connections + :type connections_prefix: str + :param variables_prefix: Specifies the prefix of the secret to read to get Variables + :type variables_prefix: str + :param sep: separator used to concatenate secret_prefix and secret_id. Default: "-" + :type sep: str + """ + + def __init__( + self, + connections_prefix: str = 'airflow-connections', + variables_prefix: str = 'airflow-variables', + vault_url: str = '', + sep: str = '-', + **kwargs + ): + super().__init__() + self.vault_url = vault_url + self.connections_prefix = connections_prefix.rstrip(sep) + self.variables_prefix = variables_prefix.rstrip(sep) + self.sep = sep + self.kwargs = kwargs + + @cached_property + def client(self): + """ + Create a Azure Key Vault client. + """ + credential = DefaultAzureCredential() + client = SecretClient( + vault_url=self.vault_url, + credential=credential, + **self.kwargs + ) + return client + + def get_conn_uri(self, conn_id: str) -> Optional[str]: + """ + Get an Airflow Connection URI from an Azure Key Vault secret + + :param conn_id: The Airflow connection id to retrieve + :type conn_id: str + """ + name = self.build_path(self.connections_prefix, conn_id, self.sep) + return self.get_secret_value(name) + + def get_variable(self, key: str) -> Optional[str]: + """ + Get an Airflow Variable from an Azure Key Vault secret. + + :param key: Variable Key + :type key: str + :return: Variable Value + """ + name = self.build_path(self.variables_prefix, key, self.sep) + return self.get_secret_value(name) + + @staticmethod + def build_path(path_prefix: str, secret_id: str, sep: str = '-') -> str: + """ + Given a path_prefix and secret_id, build a valid secret name for the Azure Key Vault Backend. + Also replaces underscore in the path with dashes to support easy switching between + environmentvariables, so ``connection_default`` becomes ``connection-default``. + + :param path_prefix: The path prefix of the secret to retrieve + :type path_prefix: str + :param secret_id: Name of the secret + :type secret_id: str + :param sep: Separator used to concatenate path_prefix and secret_id + :type sep: str + """ + path = f'{path_prefix}{sep}{secret_id}' + return path.replace('_', sep) + + def get_secret_value(self, name: str) -> Optional[str]: Review comment: We will have hooks for that, for example: https://github.com/apache/airflow/blob/master/airflow/providers/hashicorp/hooks/vault.py WDYT, would that be useful for your use-case? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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