Source code for azure.identity.aio._credentials.shared_cache

# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
from typing import TYPE_CHECKING

from ... import CredentialUnavailableError
from ..._constants import DEVELOPER_SIGN_ON_CLIENT_ID
from ..._internal.shared_token_cache import NO_TOKEN, SharedTokenCacheBase
from .._internal import AsyncContextManager
from .._internal.aad_client import AadClient
from .._internal.decorators import log_get_token_async

if TYPE_CHECKING:
    from typing import Any
    from azure.core.credentials import AccessToken
    from ..._internal.aad_client import AadClientBase


[docs]class SharedTokenCacheCredential(SharedTokenCacheBase, AsyncContextManager): """Authenticates using tokens in the local cache shared between Microsoft applications. :param str username: Username (typically an email address) of the user to authenticate as. This is required because the local cache may contain tokens for multiple identities. :keyword str authority: Authority of an Azure Active Directory endpoint, for example 'login.microsoftonline.com', the authority for Azure Public Cloud (which is the default). :class:`~azure.identity.AzureAuthorityHosts` defines authorities for other clouds. :keyword str tenant_id: an Azure Active Directory tenant ID. Used to select an account when the cache contains tokens for multiple identities. """ async def __aenter__(self): if self._client: await self._client.__aenter__() return self
[docs] async def close(self): """Close the credential's transport session.""" if self._client: await self._client.__aexit__()
[docs] @log_get_token_async async def get_token(self, *scopes: str, **kwargs: "Any") -> "AccessToken": # pylint:disable=unused-argument """Get an access token for `scopes` from the shared cache. If no access token is cached, attempt to acquire one using a cached refresh token. This method is called automatically by Azure SDK clients. :param str scopes: desired scopes for the access token. This method requires at least one scope. :rtype: :class:`azure.core.credentials.AccessToken` :raises ~azure.identity.CredentialUnavailableError: the cache is unavailable or contains insufficient user information :raises ~azure.core.exceptions.ClientAuthenticationError: authentication failed. The error's ``message`` attribute gives a reason. Any error response from Azure Active Directory is available as the error's ``response`` attribute. """ if not scopes: raise ValueError("'get_token' requires at least one scope") if not self._initialized: self._initialize() if not self._client: raise CredentialUnavailableError(message="Shared token cache unavailable") account = self._get_account(self._username, self._tenant_id) token = self._get_cached_access_token(scopes, account) if token: return token # try each refresh token, returning the first access token acquired for refresh_token in self._get_refresh_tokens(account): token = await self._client.obtain_token_by_refresh_token(scopes, refresh_token) return token raise CredentialUnavailableError(message=NO_TOKEN.format(account.get("username")))
def _get_auth_client(self, **kwargs: "Any") -> "AadClientBase": return AadClient(client_id=DEVELOPER_SIGN_ON_CLIENT_ID, **kwargs)