def _get_external_account_credentials(info,
filename,
scopes=None,
default_scopes=None,
request=None):
"""Loads external account Credentials from the parsed external account info.
The credentials information must correspond to a supported external account
credentials.
Args:
info (Mapping[str, str]): The external account info in Google format.
filename (str): The full path to the credentials file.
scopes (Optional[Sequence[str]]): The list of scopes for the credentials. If
specified, the credentials will automatically be scoped if
necessary.
default_scopes (Optional[Sequence[str]]): Default scopes passed by a
Google client library. Use 'scopes' for user-defined scopes.
request (Optional[google.auth.transport.Request]): An object used to make
HTTP requests. This is used to determine the associated project ID
for a workload identity pool resource (external account credentials).
If not specified, then it will use a
google.auth.transport.requests.Request client to make requests.
Returns:
Tuple[google.auth.credentials.Credentials, Optional[str]]: Loaded
credentials and the project ID. External account credentials project
IDs may not always be determined.
Raises:
google.auth.exceptions.DefaultCredentialsError: if the info dictionary
is in the wrong format or is missing required information.
"""
# There are currently 2 types of external_account credentials.
try:
# Check if configuration corresponds to an AWS credentials.
from google.auth import aws
credentials = aws.Credentials.from_info(info,
scopes=scopes,
default_scopes=default_scopes)
except ValueError:
try:
# Check if configuration corresponds to an Identity Pool credentials.
from google.auth import identity_pool
credentials = identity_pool.Credentials.from_info(
info, scopes=scopes, default_scopes=default_scopes)
except ValueError:
# If the configuration is invalid or does not correspond to any
# supported external_account credentials, raise an error.
raise exceptions.DefaultCredentialsError(
"Failed to load external account credentials from {}".format(
filename))
if request is None:
request = google.auth.transport.requests.Request()
return credentials, credentials.get_project_id(request=request)
def default(scopes=None, request=None, quota_project_id=None, default_scopes=None):
"""Gets the default credentials for the current environment.
`Application Default Credentials`_ provides an easy way to obtain
credentials to call Google APIs for server-to-server or local applications.
This function acquires credentials from the environment in the following
order:
1. If the environment variable ``GOOGLE_APPLICATION_CREDENTIALS`` is set
to the path of a valid service account JSON private key file, then it is
loaded and returned. The project ID returned is the project ID defined
in the service account file if available (some older files do not
contain project ID information).
If the environment variable is set to the path of a valid external
account JSON configuration file (workload identity federation), then the
configuration file is used to determine and retrieve the external
credentials from the current environment (AWS, Azure, etc).
These will then be exchanged for Google access tokens via the Google STS
endpoint.
The project ID returned in this case is the one corresponding to the
underlying workload identity pool resource if determinable.
2. If the `Google Cloud SDK`_ is installed and has application default
credentials set they are loaded and returned.
To enable application default credentials with the Cloud SDK run::
gcloud auth application-default login
If the Cloud SDK has an active project, the project ID is returned. The
active project can be set using::
gcloud config set project
3. If the application is running in the `App Engine standard environment`_
(first generation) then the credentials and project ID from the
`App Identity Service`_ are used.
4. If the application is running in `Compute Engine`_ or `Cloud Run`_ or
the `App Engine flexible environment`_ or the `App Engine standard
environment`_ (second generation) then the credentials and project ID
are obtained from the `Metadata Service`_.
5. If no credentials are found,
:class:`~google.auth.exceptions.DefaultCredentialsError` will be raised.
.. _Application Default Credentials: https://developers.google.com\
/identity/protocols/application-default-credentials
.. _Google Cloud SDK: https://cloud.google.com/sdk
.. _App Engine standard environment: https://cloud.google.com/appengine
.. _App Identity Service: https://cloud.google.com/appengine/docs/python\
/appidentity/
.. _Compute Engine: https://cloud.google.com/compute
.. _App Engine flexible environment: https://cloud.google.com\
/appengine/flexible
.. _Metadata Service: https://cloud.google.com/compute/docs\
/storing-retrieving-metadata
.. _Cloud Run: https://cloud.google.com/run
Example::
import google.auth
credentials, project_id = google.auth.default()
Args:
scopes (Sequence[str]): The list of scopes for the credentials. If
specified, the credentials will automatically be scoped if
necessary.
request (Optional[google.auth.transport.Request]): An object used to make
HTTP requests. This is used to either detect whether the application
is running on Compute Engine or to determine the associated project
ID for a workload identity pool resource (external account
credentials). If not specified, then it will either use the standard
library http client to make requests for Compute Engine credentials
or a google.auth.transport.requests.Request client for external
account credentials.
quota_project_id (Optional[str]): The project ID used for
quota and billing.
default_scopes (Optional[Sequence[str]]): Default scopes passed by a
Google client library. Use 'scopes' for user-defined scopes.
Returns:
Tuple[~google.auth.credentials.Credentials, Optional[str]]:
the current environment's credentials and project ID. Project ID
may be None, which indicates that the Project ID could not be
ascertained from the environment.
Raises:
~google.auth.exceptions.DefaultCredentialsError:
If no credentials were found, or if the credentials found were
invalid.
"""
from google.auth.credentials import with_scopes_if_required
explicit_project_id = os.environ.get(
environment_vars.PROJECT, os.environ.get(environment_vars.LEGACY_PROJECT)
)
checkers = (
# Avoid passing scopes here to prevent passing scopes to user credentials.
# with_scopes_if_required() below will ensure scopes/default scopes are
# safely set on the returned credentials since requires_scopes will
# guard against setting scopes on user credentials.
lambda: _get_explicit_environ_credentials(quota_project_id=quota_project_id),
lambda: _get_gcloud_sdk_credentials(quota_project_id=quota_project_id),
_get_gae_credentials,
lambda: _get_gce_credentials(request),
)
for checker in checkers:
credentials, project_id = checker()
if credentials is not None:
credentials = with_scopes_if_required(
credentials, scopes, default_scopes=default_scopes
)
# For external account credentials, scopes are required to determine
# the project ID. Try to get the project ID again if not yet
# determined.
if not project_id and callable(
getattr(credentials, "get_project_id", None)
):
if request is None:
request = google.auth.transport.requests.Request()
project_id = credentials.get_project_id(request=request)
if quota_project_id:
credentials = credentials.with_quota_project(quota_project_id)
effective_project_id = explicit_project_id or project_id
if not effective_project_id:
_LOGGER.warning(
"No project ID could be determined. Consider running "
"`gcloud config set project` or setting the %s "
"environment variable",
environment_vars.PROJECT,
)
return credentials, effective_project_id
raise exceptions.DefaultCredentialsError(_HELP_MESSAGE)