// Package mode provides a domain-local ACL mode indicator readable by
// packages that need to know the current access control mode without
// circular dependencies.
package mode

// ACLMode holds the current ACL mode. Plain variable - single
// cooperative thread per domain, no atomic needed.
var ACLMode []byte

// IsOpenMode reports whether an ACL mode value means an open relay.
func IsOpenMode(m []byte) (ok bool) {
	return len(m) == 4 &&
		m[0] == 'n' && m[1] == 'o' &&
		m[2] == 'n' && m[3] == 'e'
}

// IsOpen returns true if the current ACL mode is "none" (open relay mode).
func IsOpen() (ok bool) {
	return IsOpenMode(ACLMode)
}