Source code for airflow.providers.amazon.aws.secrets.systems_manager

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"""Objects relating to sourcing connections from AWS SSM Parameter Store"""
from __future__ import annotations

import re
import warnings

from airflow.compat.functools import cached_property
from airflow.providers.amazon.aws.utils import trim_none_values
from airflow.secrets import BaseSecretsBackend
from airflow.utils.log.logging_mixin import LoggingMixin


[docs]class SystemsManagerParameterStoreBackend(BaseSecretsBackend, LoggingMixin): """ Retrieves Connection or Variables from AWS SSM Parameter Store Configurable via ``airflow.cfg`` like so: .. code-block:: ini [secrets] backend = airflow.providers.amazon.aws.secrets.systems_manager.SystemsManagerParameterStoreBackend backend_kwargs = {"connections_prefix": "/airflow/connections", "profile_name": null} For example, if ssm path is ``/airflow/connections/smtp_default``, this would be accessible if you provide ``{"connections_prefix": "/airflow/connections"}`` and request conn_id ``smtp_default``. And if ssm path is ``/airflow/variables/hello``, this would be accessible if you provide ``{"variables_prefix": "/airflow/variables"}`` and variable key ``hello``. :param connections_prefix: Specifies the prefix of the secret to read to get Connections. If set to None (null), requests for connections will not be sent to AWS SSM Parameter Store. :param connections_lookup_pattern: Specifies a pattern the connection ID needs to match to be looked up in AWS Parameter Store. Applies only if `connections_prefix` is not None. If set to None (null value in the configuration), all connections will be looked up first in AWS Parameter Store. :param variables_prefix: Specifies the prefix of the secret to read to get Variables. If set to None (null), requests for variables will not be sent to AWS SSM Parameter Store. :param variables_lookup_pattern: Specifies a pattern the variable key needs to match to be looked up in AWS Parameter Store. Applies only if `variables_prefix` is not None. If set to None (null value in the configuration), all variables will be looked up first in AWS Parameter Store. :param config_prefix: Specifies the prefix of the secret to read to get Variables. If set to None (null), requests for configurations will not be sent to AWS SSM Parameter Store. :param config_lookup_pattern: Specifies a pattern the config key needs to match to be looked up in AWS Parameter Store. Applies only if `config_prefix` is not None. If set to None (null value in the configuration), all config keys will be looked up first in AWS Parameter Store. You can also pass additional keyword arguments listed in AWS Connection Extra config to this class, and they would be used for establish connection and passed on to Boto3 client. .. code-block:: ini [secrets] backend = airflow.providers.amazon.aws.secrets.systems_manager.SystemsManagerParameterStoreBackend backend_kwargs = {"connections_prefix": "airflow/connections", "region_name": "eu-west-1"} .. seealso:: :ref:`howto/connection:aws:configuring-the-connection` """ def __init__( self, connections_prefix: str = "/airflow/connections", connections_lookup_pattern: str | None = None, variables_prefix: str = "/airflow/variables", variables_lookup_pattern: str | None = None, config_prefix: str = "/airflow/config", config_lookup_pattern: str | None = None, **kwargs, ): super().__init__() if connections_prefix is not None: self.connections_prefix = connections_prefix.rstrip("/") else: self.connections_prefix = connections_prefix if variables_prefix is not None: self.variables_prefix = variables_prefix.rstrip("/") else: self.variables_prefix = variables_prefix if config_prefix is not None: self.config_prefix = config_prefix.rstrip("/") else: self.config_prefix = config_prefix self.connections_lookup_pattern = connections_lookup_pattern self.variables_lookup_pattern = variables_lookup_pattern self.config_lookup_pattern = config_lookup_pattern self.profile_name = kwargs.get("profile_name", None) # Remove client specific arguments from kwargs self.api_version = kwargs.pop("api_version", None) self.use_ssl = kwargs.pop("use_ssl", None) self.kwargs = kwargs @cached_property
[docs] def client(self): """Create a SSM client""" from airflow.providers.amazon.aws.hooks.base_aws import SessionFactory from airflow.providers.amazon.aws.utils.connection_wrapper import AwsConnectionWrapper conn_id = f"{self.__class__.__name__}__connection" conn_config = AwsConnectionWrapper.from_connection_metadata(conn_id=conn_id, extra=self.kwargs) client_kwargs = trim_none_values( { "region_name": conn_config.region_name, "verify": conn_config.verify, "endpoint_url": conn_config.endpoint_url, "api_version": self.api_version, "use_ssl": self.use_ssl, } ) session = SessionFactory(conn=conn_config).create_session() return session.client(service_name="ssm", **client_kwargs)
[docs] def get_conn_value(self, conn_id: str) -> str | None: """ Get param value :param conn_id: connection id """ if self.connections_prefix is None: return None return self._get_secret(self.connections_prefix, conn_id, self.connections_lookup_pattern)
[docs] def get_conn_uri(self, conn_id: str) -> str | None: """ Return URI representation of Connection conn_id. As of Airflow version 2.3.0 this method is deprecated. :param conn_id: the connection id """ warnings.warn( f"Method `{self.__class__.__name__}.get_conn_uri` is deprecated and will be removed " "in a future release. Please use method `get_conn_value` instead.", DeprecationWarning, stacklevel=2, ) value = self.get_conn_value(conn_id) if value is None: return None return self.deserialize_connection(conn_id, value).get_uri()
[docs] def get_variable(self, key: str) -> str | None: """ Get Airflow Variable :param key: Variable Key :return: Variable Value """ if self.variables_prefix is None: return None return self._get_secret(self.variables_prefix, key, self.variables_lookup_pattern)
[docs] def get_config(self, key: str) -> str | None: """ Get Airflow Configuration :param key: Configuration Option Key :return: Configuration Option Value """ if self.config_prefix is None: return None return self._get_secret(self.config_prefix, key, self.config_lookup_pattern)
def _get_secret(self, path_prefix: str, secret_id: str, lookup_pattern: str | None) -> str | None: """ Get secret value from Parameter Store. :param path_prefix: Prefix for the Path to get Secret :param secret_id: Secret Key :param lookup_pattern: If provided, `secret_id` must match this pattern to look up the secret in Systems Manager """ if lookup_pattern and not re.match(lookup_pattern, secret_id, re.IGNORECASE): return None ssm_path = self.build_path(path_prefix, secret_id) ssm_path = self._ensure_leading_slash(ssm_path) try: response = self.client.get_parameter(Name=ssm_path, WithDecryption=True) return response["Parameter"]["Value"] except self.client.exceptions.ParameterNotFound: self.log.debug("Parameter %s not found.", ssm_path) return None def _ensure_leading_slash(self, ssm_path: str): """ AWS Systems Manager mandate to have a leading "/". Adding it dynamically if not there to the SSM path :param ssm_path: SSM parameter path """ if not ssm_path.startswith("/"): ssm_path = f"/{ssm_path}" return ssm_path

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