ducky/devices
2015-11-12
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/dce.go
Initial attempt. Create the basic types (Device, DeviceType, DeviceChange) that we'll be using in the service. Also, create our Storer interface, and the helper methods to store, retrieve, and update information in the datastore. Also, we're using Godep, so check in our Godeps folder and the vendor folder. Note that this only works on Go 1.5 and later, with the GO15VENDOREXPERIMENT environment variable set to 1.
1 // Copyright 2011 Google Inc. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 package uuid
7 import (
8 "encoding/binary"
9 "fmt"
10 "os"
11 )
13 // A Domain represents a Version 2 domain
14 type Domain byte
16 // Domain constants for DCE Security (Version 2) UUIDs.
17 const (
18 Person = Domain(0)
19 Group = Domain(1)
20 Org = Domain(2)
21 )
23 // NewDCESecurity returns a DCE Security (Version 2) UUID.
24 //
25 // The domain should be one of Person, Group or Org.
26 // On a POSIX system the id should be the users UID for the Person
27 // domain and the users GID for the Group. The meaning of id for
28 // the domain Org or on non-POSIX systems is site defined.
29 //
30 // For a given domain/id pair the same token may be returned for up to
31 // 7 minutes and 10 seconds.
32 func NewDCESecurity(domain Domain, id uint32) UUID {
33 uuid := NewUUID()
34 if uuid != nil {
35 uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2
36 uuid[9] = byte(domain)
37 binary.BigEndian.PutUint32(uuid[0:], id)
38 }
39 return uuid
40 }
42 // NewDCEPerson returns a DCE Security (Version 2) UUID in the person
43 // domain with the id returned by os.Getuid.
44 //
45 // NewDCEPerson(Person, uint32(os.Getuid()))
46 func NewDCEPerson() UUID {
47 return NewDCESecurity(Person, uint32(os.Getuid()))
48 }
50 // NewDCEGroup returns a DCE Security (Version 2) UUID in the group
51 // domain with the id returned by os.Getgid.
52 //
53 // NewDCEGroup(Group, uint32(os.Getgid()))
54 func NewDCEGroup() UUID {
55 return NewDCESecurity(Group, uint32(os.Getgid()))
56 }
58 // Domain returns the domain for a Version 2 UUID or false.
59 func (uuid UUID) Domain() (Domain, bool) {
60 if v, _ := uuid.Version(); v != 2 {
61 return 0, false
62 }
63 return Domain(uuid[9]), true
64 }
66 // Id returns the id for a Version 2 UUID or false.
67 func (uuid UUID) Id() (uint32, bool) {
68 if v, _ := uuid.Version(); v != 2 {
69 return 0, false
70 }
71 return binary.BigEndian.Uint32(uuid[0:4]), true
72 }
74 func (d Domain) String() string {
75 switch d {
76 case Person:
77 return "Person"
78 case Group:
79 return "Group"
80 case Org:
81 return "Org"
82 }
83 return fmt.Sprintf("Domain%d", int(d))
84 }