ducky/devices
2015-11-27
Parent:b6494e1a499e
ducky/devices/vendor/code.google.com/p/go-uuid/uuid/dce.go
Implement and test updating devices, and reuse contexts. Update all our tests to use the same context.Context instance within each test case, so static analysis about how we're passing contexts around dosn't get tripped up. Also, write a test that will check to make sure that our Storer implementations all actually update the Device correctly. We create every possible permutation of a DeviceChange, just to make sure they all work.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 import ( |
| paddy@0 | 8 "encoding/binary" |
| paddy@0 | 9 "fmt" |
| paddy@0 | 10 "os" |
| paddy@0 | 11 ) |
| paddy@0 | 12 |
| paddy@0 | 13 // A Domain represents a Version 2 domain |
| paddy@0 | 14 type Domain byte |
| paddy@0 | 15 |
| paddy@0 | 16 // Domain constants for DCE Security (Version 2) UUIDs. |
| paddy@0 | 17 const ( |
| paddy@0 | 18 Person = Domain(0) |
| paddy@0 | 19 Group = Domain(1) |
| paddy@0 | 20 Org = Domain(2) |
| paddy@0 | 21 ) |
| paddy@0 | 22 |
| paddy@0 | 23 // NewDCESecurity returns a DCE Security (Version 2) UUID. |
| paddy@0 | 24 // |
| paddy@0 | 25 // The domain should be one of Person, Group or Org. |
| paddy@0 | 26 // On a POSIX system the id should be the users UID for the Person |
| paddy@0 | 27 // domain and the users GID for the Group. The meaning of id for |
| paddy@0 | 28 // the domain Org or on non-POSIX systems is site defined. |
| paddy@0 | 29 // |
| paddy@0 | 30 // For a given domain/id pair the same token may be returned for up to |
| paddy@0 | 31 // 7 minutes and 10 seconds. |
| paddy@0 | 32 func NewDCESecurity(domain Domain, id uint32) UUID { |
| paddy@0 | 33 uuid := NewUUID() |
| paddy@0 | 34 if uuid != nil { |
| paddy@0 | 35 uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2 |
| paddy@0 | 36 uuid[9] = byte(domain) |
| paddy@0 | 37 binary.BigEndian.PutUint32(uuid[0:], id) |
| paddy@0 | 38 } |
| paddy@0 | 39 return uuid |
| paddy@0 | 40 } |
| paddy@0 | 41 |
| paddy@0 | 42 // NewDCEPerson returns a DCE Security (Version 2) UUID in the person |
| paddy@0 | 43 // domain with the id returned by os.Getuid. |
| paddy@0 | 44 // |
| paddy@0 | 45 // NewDCEPerson(Person, uint32(os.Getuid())) |
| paddy@0 | 46 func NewDCEPerson() UUID { |
| paddy@0 | 47 return NewDCESecurity(Person, uint32(os.Getuid())) |
| paddy@0 | 48 } |
| paddy@0 | 49 |
| paddy@0 | 50 // NewDCEGroup returns a DCE Security (Version 2) UUID in the group |
| paddy@0 | 51 // domain with the id returned by os.Getgid. |
| paddy@0 | 52 // |
| paddy@0 | 53 // NewDCEGroup(Group, uint32(os.Getgid())) |
| paddy@0 | 54 func NewDCEGroup() UUID { |
| paddy@0 | 55 return NewDCESecurity(Group, uint32(os.Getgid())) |
| paddy@0 | 56 } |
| paddy@0 | 57 |
| paddy@0 | 58 // Domain returns the domain for a Version 2 UUID or false. |
| paddy@0 | 59 func (uuid UUID) Domain() (Domain, bool) { |
| paddy@0 | 60 if v, _ := uuid.Version(); v != 2 { |
| paddy@0 | 61 return 0, false |
| paddy@0 | 62 } |
| paddy@0 | 63 return Domain(uuid[9]), true |
| paddy@0 | 64 } |
| paddy@0 | 65 |
| paddy@0 | 66 // Id returns the id for a Version 2 UUID or false. |
| paddy@0 | 67 func (uuid UUID) Id() (uint32, bool) { |
| paddy@0 | 68 if v, _ := uuid.Version(); v != 2 { |
| paddy@0 | 69 return 0, false |
| paddy@0 | 70 } |
| paddy@0 | 71 return binary.BigEndian.Uint32(uuid[0:4]), true |
| paddy@0 | 72 } |
| paddy@0 | 73 |
| paddy@0 | 74 func (d Domain) String() string { |
| paddy@0 | 75 switch d { |
| paddy@0 | 76 case Person: |
| paddy@0 | 77 return "Person" |
| paddy@0 | 78 case Group: |
| paddy@0 | 79 return "Group" |
| paddy@0 | 80 case Org: |
| paddy@0 | 81 return "Org" |
| paddy@0 | 82 } |
| paddy@0 | 83 return fmt.Sprintf("Domain%d", int(d)) |
| paddy@0 | 84 } |