Source code for globus_sdk.authorizers.client_credentials

import logging
import typing as t

from globus_sdk._types import ScopeCollectionType
from globus_sdk.scopes import MutableScope

if t.TYPE_CHECKING:
    from globus_sdk.services.auth import ConfidentialAppAuthClient, OAuthTokenResponse

from .renewing import RenewingAuthorizer

log = logging.getLogger(__name__)


[docs]class ClientCredentialsAuthorizer(RenewingAuthorizer): r""" Implementation of a RenewingAuthorizer that renews confidential app client Access Tokens using a ConfidentialAppAuthClient and a set of scopes to fetch a new Access Token when the old one expires. Example usage looks something like this: >>> import globus_sdk >>> confidential_client = globus_sdk.ConfidentialAppAuthClient( client_id=..., client_secret=...) >>> scopes = "..." >>> cc_authorizer = globus_sdk.ClientCredentialsAuthorizer( >>> confidential_client, scopes) >>> # create a new client >>> transfer_client = globus_sdk.TransferClient(authorizer=cc_authorizer) any client that inherits from :class:`BaseClient <globus_sdk.BaseClient>` should be able to use a ClientCredentialsAuthorizer to act as the client itself. :param confidential_client: client object with a valid id and client secret :type confidential_client: :class:`ConfidentialAppAuthClient\ <globus_sdk.ConfidentialAppAuthClient>` :param scopes: A string of space-separated scope names being requested for the access tokens that will be used for the Authorization header. These scopes must all be for the same resource server, or else the token response will have multiple access tokens. :type scopes: str, MutableScope, or iterable of str or MutableScope :param access_token: Initial Access Token to use, only used if ``expires_at`` is also set. Must be requested with the same set of scopes passed to this authorizer. :type access_token: str :param expires_at: Expiration time for the starting ``access_token`` expressed as a POSIX timestamp (i.e. seconds since the epoch) :type expires_at: int, optional :param on_refresh: A callback which is triggered any time this authorizer fetches a new access_token. The ``on_refresh`` callable is invoked on the :class:`OAuthTokenResponse <globus_sdk.OAuthTokenResponse>` object resulting from the token being refreshed. It should take only one argument, the token response object. This is useful for implementing storage for Access Tokens, as the ``on_refresh`` callback can be used to update the Access Tokens and their expiration times. :type on_refresh: callable, optional """ def __init__( self, confidential_client: "ConfidentialAppAuthClient", scopes: ScopeCollectionType, *, access_token: t.Optional[str] = None, expires_at: t.Optional[int] = None, on_refresh: t.Optional[t.Callable[["OAuthTokenResponse"], t.Any]] = None, ): # values for _get_token_data self.confidential_client = confidential_client self.scopes = MutableScope.scopes2str(scopes) log.info( "Setting up ClientCredentialsAuthorizer with confidential_client=" f"[instance:{id(confidential_client)}] and scopes={self.scopes}" ) super().__init__(access_token, expires_at, on_refresh) def _get_token_response(self) -> "OAuthTokenResponse": """ Make a client credentials grant """ return self.confidential_client.oauth2_client_credentials_tokens( requested_scopes=self.scopes ) def _extract_token_data(self, res: "OAuthTokenResponse") -> t.Dict[str, t.Any]: """ Get the tokens .by_resource_server, Ensure that only one token was gotten, and return that token. """ token_data = res.by_resource_server.values() if len(token_data) != 1: raise ValueError( "Attempting get new access token for client credentials " "authorizer didn't return exactly one token. Ensure scopes " f"{self.scopes} are for only one resource server." ) return next(iter(token_data))