Class for Identity and Access Management (IAM) policies. IAM policies are used to specify access
settings for Cloud Platform resources. A policy is a list of bindings. A binding assigns a set of
identities to a role, where the identities can be user accounts, Google groups, Google domains,
and service accounts. A role is a named list of permissions defined by IAM.
See Also: Policy
Etags are used for optimistic concurrency control as a way to help prevent simultaneous
updates of a policy from overwriting each other. It is strongly suggested that systems make use
of the etag in the read-modify-write cycle to perform policy updates in order to avoid race
conditions. An etag is returned in the response to getIamPolicy, and systems are expected to
put that etag in the request to setIamPolicy to ensure that their change will be applied to the
same version of the policy. If no etag is provided in the call to setIamPolicy, then the
existing policy is overwritten blindly.
Returns the version of the policy. The default version is 0, meaning only the "owner",
"editor", and "viewer" roles are permitted. If the version is 1, you may also use other roles.
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