const (
	// ImpersonateUserHeader is used to impersonate a particular user during an API server request
	ImpersonateUserHeader = "Impersonate-User"

	// ImpersonateGroupHeader is used to impersonate a particular group during an API server request.
	// It can be repeated multiplied times for multiple groups.
	ImpersonateGroupHeader = "Impersonate-Group"

	// ImpersonateUserExtraHeaderPrefix is a prefix for any header used to impersonate an entry in the
	// extra map[string][]string for user.Info.  The key will be every after the prefix.
	// It can be repeated multiplied times for multiple map keys and the same key can be repeated multiple
	// times to have multiple elements in the slice under a single key
	ImpersonateUserExtraHeaderPrefix = "Impersonate-Extra-"
)

const GroupName = "authentication.k8s.io"

var (
	SchemeBuilder = runtime.NewSchemeBuilder(addKnownTypes)
	AddToScheme   = SchemeBuilder.AddToScheme
)

var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: runtime.APIVersionInternal}

type ExtraValue []string

type TokenReview struct {
	metav1.TypeMeta
	// ObjectMeta fulfills the metav1.ObjectMetaAccessor interface so that the stock
	// REST handler paths work
	metav1.ObjectMeta

	// Spec holds information about the request being evaluated
	Spec TokenReviewSpec

	// Status is filled in by the server and indicates whether the request can be authenticated.
	Status TokenReviewStatus
}

type TokenReviewSpec struct {
	// Token is the opaque bearer token.
	Token string
}

type TokenReviewStatus struct {
	// Authenticated indicates that the token was associated with a known user.
	Authenticated bool
	// User is the UserInfo associated with the provided token.
	User UserInfo
	// Error indicates that the token couldn't be checked
	Error string
}

type UserInfo struct {
	// The name that uniquely identifies this user among all active users.
	Username string
	// A unique value that identifies this user across time. If this user is
	// deleted and another user by the same name is added, they will have
	// different UIDs.
	UID string
	// The names of groups this user is a part of.
	Groups []string
	// Any additional information provided by the authenticator.
	Extra map[string]ExtraValue
}