message Subject {
  // Kind of object being referenced. Values defined by this API group are "User", "Group", and "ServiceAccount".
  // If the Authorizer does not recognized the kind value, the Authorizer should report an error.
  optional string kind = 1;

  // APIGroup holds the API group of the referenced subject.
  // Defaults to "" for ServiceAccount subjects.
  // Defaults to "rbac.authorization.k8s.io" for User and Group subjects.
  // +optional

  // +optional
  optional UserSubject user = 2;

  // `group` matches based on user group name.
  // +optional
  optional GroupSubject group = 3;

  // `serviceAccount` matches ServiceAccounts.
  // +optional
  optional ServiceAccountSubject serviceAccount = 4;
}

// UserSubject holds detailed information for user-kind subject.
message UserSubject {
  // `name` is the username that matches, or "*" to match all usernames.

  // +optional
  optional UserSubject user = 2;

  // `group` matches based on user group name.
  // +optional
  optional GroupSubject group = 3;

  // `serviceAccount` matches ServiceAccounts.
  // +optional
  optional ServiceAccountSubject serviceAccount = 4;
}

// UserSubject holds detailed information for user-kind subject.
message UserSubject {
  // `name` is the username that matches, or "*" to match all usernames.

  // +optional
  optional UserSubject user = 2;

  // `group` matches based on user group name.
  // +optional
  optional GroupSubject group = 3;

  // `serviceAccount` matches ServiceAccounts.
  // +optional
  optional ServiceAccountSubject serviceAccount = 4;
}

// UserSubject holds detailed information for user-kind subject.
message UserSubject {
  // `name` is the username that matches, or "*" to match all usernames.

  // +optional
  optional UserSubject user = 2;

  // `group` matches based on user group name.
  // +optional
  optional GroupSubject group = 3;

  // `serviceAccount` matches ServiceAccounts.
  // +optional
  optional ServiceAccountSubject serviceAccount = 4;
}

// UserSubject holds detailed information for user-kind subject.
message UserSubject {
  // `name` is the username that matches, or "*" to match all usernames.

  // will pass the tokens in VolumeContext in the CSI NodePublishVolume calls.
  // The CSI driver should parse and validate the following VolumeContext:
  // "csi.storage.k8s.io/serviceAccount.tokens": {
  //   "<audience>": {
  //     "token": <token>,
  //     "expirationTimestamp": <expiration timestamp in RFC3339>,
  //   },
  //   ...
  // }
  //

}

// ServiceAccountList is a list of ServiceAccount objects
message ServiceAccountList {
  // Standard list metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.ListMeta metadata = 1;

  // List of ServiceAccounts.

  // Kind of object being referenced. Values defined by this API group are "User", "Group", and "ServiceAccount".
  // If the Authorizer does not recognized the kind value, the Authorizer should report an error.
  optional string kind = 1;

  // APIVersion holds the API group and version of the referenced subject.
  // Defaults to "v1" for ServiceAccount subjects.
  // Defaults to "rbac.authorization.k8s.io/v1alpha1" for User and Group subjects.

message Subject {
  // Kind of object being referenced. Values defined by this API group are "User", "Group", and "ServiceAccount".
  // If the Authorizer does not recognized the kind value, the Authorizer should report an error.
  optional string kind = 1;

  // APIGroup holds the API group of the referenced subject.
  // Defaults to "" for ServiceAccount subjects.
  // Defaults to "rbac.authorization.k8s.io" for User and Group subjects.
  // +optional

  // More info: http://kubernetes.io/docs/user-guide/node-selection/README
  // +optional
  map<string, string> nodeSelector = 7;

  // ServiceAccountName is the name of the ServiceAccount to use to run this carp.
  // More info: https://kubernetes.io/docs/concepts/security/service-accounts/
  // +optional
  optional string serviceAccountName = 8;