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"""Objects relating to sourcing connections from Google Cloud Secrets Manager"""
import logging
import re
import warnings
from typing import Optional
from google.auth.exceptions import DefaultCredentialsError
from airflow.exceptions import AirflowException
from airflow.providers.google.cloud._internal_client.secret_manager_client import _SecretManagerClient
from airflow.providers.google.cloud.utils.credentials_provider import get_credentials_and_project_id
from airflow.secrets import BaseSecretsBackend
from airflow.utils.log.logging_mixin import LoggingMixin
from airflow.version import version as airflow_version
[docs]log = logging.getLogger(__name__)
[docs]SECRET_ID_PATTERN = r"^[a-zA-Z0-9-_]*$"
def _parse_version(val):
val = re.sub(r'(\d+\.\d+\.\d+).*', lambda x: x.group(1), val)
return tuple(int(x) for x in val.split('.'))
[docs]class CloudSecretManagerBackend(BaseSecretsBackend, LoggingMixin):
"""
Retrieves Connection object from Google Cloud Secrets Manager
Configurable via ``airflow.cfg`` as follows:
.. code-block:: ini
[secrets]
backend = airflow.providers.google.cloud.secrets.secret_manager.CloudSecretManagerBackend
backend_kwargs = {"connections_prefix": "airflow-connections", "sep": "-"}
For example, if the Secrets Manager secret id is ``airflow-connections-smtp_default``, this would be
accessible if you provide ``{"connections_prefix": "airflow-connections", "sep": "-"}`` and request
conn_id ``smtp_default``.
If the Secrets Manager secret id is ``airflow-variables-hello``, this would be
accessible if you provide ``{"variables_prefix": "airflow-variables", "sep": "-"}`` and request
Variable Key ``hello``.
The full secret id should follow the pattern "[a-zA-Z0-9-_]".
: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 GCP Secrets Manager
: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 GCP Secrets Manager
:param config_prefix: Specifies the prefix of the secret to read to get Airflow Configurations
containing secrets.
If set to None (null), requests for configurations will not be sent to GCP Secrets Manager
:param gcp_key_path: Path to Google Cloud Service Account key file (JSON). Mutually exclusive with
gcp_keyfile_dict. use default credentials in the current environment if not provided.
:param gcp_keyfile_dict: Dictionary of keyfile parameters. Mutually exclusive with gcp_key_path.
:param gcp_scopes: Comma-separated string containing OAuth2 scopes
:param project_id: Project ID to read the secrets from. If not passed, the project ID from credentials
will be used.
:param sep: Separator used to concatenate connections_prefix and conn_id. Default: "-"
"""
def __init__(
self,
connections_prefix: str = "airflow-connections",
variables_prefix: str = "airflow-variables",
config_prefix: str = "airflow-config",
gcp_keyfile_dict: Optional[dict] = None,
gcp_key_path: Optional[str] = None,
gcp_scopes: Optional[str] = None,
project_id: Optional[str] = None,
sep: str = "-",
**kwargs,
) -> None:
super().__init__(**kwargs)
self.connections_prefix = connections_prefix
self.variables_prefix = variables_prefix
self.config_prefix = config_prefix
self.sep = sep
if connections_prefix is not None:
if not self._is_valid_prefix_and_sep():
raise AirflowException(
"`connections_prefix`, `variables_prefix` and `sep` should "
f"follows that pattern {SECRET_ID_PATTERN}"
)
try:
self.credentials, self.project_id = get_credentials_and_project_id(
keyfile_dict=gcp_keyfile_dict, key_path=gcp_key_path, scopes=gcp_scopes
)
except (DefaultCredentialsError, FileNotFoundError):
log.exception(
'Unable to load credentials for GCP Secret Manager. '
'Make sure that the keyfile path, dictionary, or GOOGLE_APPLICATION_CREDENTIALS '
'environment variable is correct and properly configured.'
)
# In case project id provided
if project_id:
self.project_id = project_id
@property
[docs] def client(self) -> _SecretManagerClient:
"""
Property returning secret client.
:return: Secrets client
"""
return _SecretManagerClient(credentials=self.credentials)
def _is_valid_prefix_and_sep(self) -> bool:
prefix = self.connections_prefix + self.sep
return _SecretManagerClient.is_valid_secret_name(prefix)
[docs] def get_conn_value(self, conn_id: str) -> Optional[str]:
"""
Get serialized representation of Connection
:param conn_id: connection id
"""
if self.connections_prefix is None:
return None
return self._get_secret(self.connections_prefix, conn_id)
[docs] def get_conn_uri(self, conn_id: str) -> Optional[str]:
"""
Return URI representation of Connection conn_id.
As of Airflow version 2.3.0 this method is deprecated.
:param conn_id: the connection id
:return: deserialized Connection
"""
if _parse_version(airflow_version) >= (2, 3):
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,
)
return self.get_conn_value(conn_id)
[docs] def get_variable(self, key: str) -> Optional[str]:
"""
Get Airflow Variable from Environment Variable
:param key: Variable Key
:return: Variable Value
"""
if self.variables_prefix is None:
return None
return self._get_secret(self.variables_prefix, key)
[docs] def get_config(self, key: str) -> Optional[str]:
"""
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)
def _get_secret(self, path_prefix: str, secret_id: str) -> Optional[str]:
"""
Get secret value from the SecretManager based on prefix.
:param path_prefix: Prefix for the Path to get Secret
:param secret_id: Secret Key
"""
secret_id = self.build_path(path_prefix, secret_id, self.sep)
return self.client.get_secret(secret_id=secret_id, project_id=self.project_id)
