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can use.

To downscope permissions of a source credential, a Credential Access Boundary
that specifies which resources the new credential can access, as well as
an upper bound on the permissions that are available on each resource, has to
be defined. A downscoped credential can then be instantiated using the source
credential and the Credential Access Boundary.

The common pattern of usage is to have a token broker with elevated access
generate these downscoped credentials from higher access source credentials and
pass the downscoped short-lived access tokens to a token consumer via some
secure authenticated channel for limited access to Google Cloud Storage
resources.

For example, a token broker can be set up on a server in a private network.
Various workloads (token consumers) in the same network will send authenticated
requests to that broker for downscoped tokens to access or modify specific google
cloud storage buckets.

The broker will instantiate downscoped credentials instances that can be used to
generate short lived downscoped access tokens that can be passed to the token
consumer. These downscoped access tokens can be injected by the consumer into
google.oauth2.Credentials and used to initialize a storage client instance to
access Google Cloud Storage resources with restricted access.

Note: Only Cloud Storage supports Credential Access Boundaries. Other Google
Cloud services do not support this feature.

.. _Downscoping with Credential Access Boundaries: https://cloud.google.com/iam/docs/downscoping-short-lived-credentials
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