authn

type Authenticator interface {
	// Authorization returns the value to use in an http transport's Authorization header.
	Authorization() (string, error)
}

type Basic struct {
	Username string
	Password string
}

type Bearer struct {
	Token string `json:"token"`
}

type Keychain interface {
	// Resolve looks up the most appropriate credential for the specified registry.
	Resolve(name.Registry) (Authenticator, error)
}