Skip to content
Branch: master
Find file Copy path
Find file Copy path
2 contributors

Users who have contributed to this file

@bmatsuo @Kerrigan29a
81 lines (70 sloc) 2.02 KB
// Copyright 2016 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package uuid
import (
// A Domain represents a Version 2 domain
type Domain byte
// Domain constants for DCE Security (Version 2) UUIDs.
const (
Person = Domain(0)
Group = Domain(1)
Org = Domain(2)
// NewDCESecurity returns a DCE Security (Version 2) UUID.
// The domain should be one of Person, Group or Org.
// On a POSIX system the id should be the users UID for the Person
// domain and the users GID for the Group. The meaning of id for
// the domain Org or on non-POSIX systems is site defined.
// For a given domain/id pair the same token may be returned for up to
// 7 minutes and 10 seconds.
func NewDCESecurity(domain Domain, id uint32) (UUID, error) {
uuid, err := NewUUID()
if err == nil {
uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2
uuid[9] = byte(domain)
binary.BigEndian.PutUint32(uuid[0:], id)
return uuid, err
// NewDCEPerson returns a DCE Security (Version 2) UUID in the person
// domain with the id returned by os.Getuid.
// NewDCESecurity(Person, uint32(os.Getuid()))
func NewDCEPerson() (UUID, error) {
return NewDCESecurity(Person, uint32(os.Getuid()))
// NewDCEGroup returns a DCE Security (Version 2) UUID in the group
// domain with the id returned by os.Getgid.
// NewDCESecurity(Group, uint32(os.Getgid()))
func NewDCEGroup() (UUID, error) {
return NewDCESecurity(Group, uint32(os.Getgid()))
// Domain returns the domain for a Version 2 UUID. Domains are only defined
// for Version 2 UUIDs.
func (uuid UUID) Domain() Domain {
return Domain(uuid[9])
// ID returns the id for a Version 2 UUID. IDs are only defined for Version 2
// UUIDs.
func (uuid UUID) ID() uint32 {
return binary.BigEndian.Uint32(uuid[0:4])
func (d Domain) String() string {
switch d {
case Person:
return "Person"
case Group:
return "Group"
case Org:
return "Org"
return fmt.Sprintf("Domain%d", int(d))
You can’t perform that action at this time.