kubernetes/vendor/go.etcd.io/etcd/server/v3/etcdserver/server_access_control.go

type AccessController …

// NewAccessController returns a new "AccessController" with default "*" values.
func NewAccessController() *AccessController { … }

// OriginAllowed determines whether the server will allow a given CORS origin.
// If CORS is empty, allow all.
func (ac *AccessController) OriginAllowed(origin string) bool { … }

// IsHostWhitelisted returns true if the host is whitelisted.
// If whitelist is empty, allow all.
func (ac *AccessController) IsHostWhitelisted(host string) bool { … }