This folder contains protocol buffer types which represent IAM (Identity and Access Management) concepts plus a mix-in service declaration (IAMPolicy) which can be inherited by APIs so that they follow a consistent pattern for IAM operations.

• Binding: Associates a list of identities with a particular role. An identity can match things like all users, all authenticated users, a single user, a single service account, a single group, or a single domain. A role is a permission defined by IAM, such as roles/viewer, roles/editor, or roles/owner.
• Policy: A list of bindings where each role can only appear once. It also contains a version to track iterations of the bindings.

• IAMPolicy: This is a mix-in service which defines three operations:
  • SetIamPolicy: Sets the access control policy on the specified resource.
  • GetIamPolicy: Gets the access control policy for a resource.
  • TestIamPermissions: Returns permissions that a caller has on the specified resource.