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80 lines
2.0 KiB
80 lines
2.0 KiB
// Copyright 2016 Google Inc. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package uuid |
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import ( |
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"encoding/binary" |
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"fmt" |
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"os" |
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) |
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// A Domain represents a Version 2 domain |
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type Domain byte |
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// Domain constants for DCE Security (Version 2) UUIDs. |
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const ( |
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Person = Domain(0) |
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Group = Domain(1) |
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Org = Domain(2) |
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) |
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// NewDCESecurity returns a DCE Security (Version 2) UUID. |
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// |
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// The domain should be one of Person, Group or Org. |
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// On a POSIX system the id should be the users UID for the Person |
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// domain and the users GID for the Group. The meaning of id for |
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// the domain Org or on non-POSIX systems is site defined. |
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// |
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// For a given domain/id pair the same token may be returned for up to |
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// 7 minutes and 10 seconds. |
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func NewDCESecurity(domain Domain, id uint32) (UUID, error) { |
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uuid, err := NewUUID() |
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if err == nil { |
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uuid[6] = (uuid[6] & 0x0f) | 0x20 // Version 2 |
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uuid[9] = byte(domain) |
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binary.BigEndian.PutUint32(uuid[0:], id) |
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} |
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return uuid, err |
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} |
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// NewDCEPerson returns a DCE Security (Version 2) UUID in the person |
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// domain with the id returned by os.Getuid. |
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// |
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// NewDCESecurity(Person, uint32(os.Getuid())) |
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func NewDCEPerson() (UUID, error) { |
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return NewDCESecurity(Person, uint32(os.Getuid())) |
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} |
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// NewDCEGroup returns a DCE Security (Version 2) UUID in the group |
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// domain with the id returned by os.Getgid. |
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// |
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// NewDCESecurity(Group, uint32(os.Getgid())) |
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func NewDCEGroup() (UUID, error) { |
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return NewDCESecurity(Group, uint32(os.Getgid())) |
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} |
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// Domain returns the domain for a Version 2 UUID. Domains are only defined |
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// for Version 2 UUIDs. |
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func (uuid UUID) Domain() Domain { |
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return Domain(uuid[9]) |
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} |
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// ID returns the id for a Version 2 UUID. IDs are only defined for Version 2 |
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// UUIDs. |
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func (uuid UUID) ID() uint32 { |
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return binary.BigEndian.Uint32(uuid[0:4]) |
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} |
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func (d Domain) String() string { |
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switch d { |
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case Person: |
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return "Person" |
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case Group: |
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return "Group" |
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case Org: |
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return "Org" |
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} |
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return fmt.Sprintf("Domain%d", int(d)) |
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}
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