-
Notifications
You must be signed in to change notification settings - Fork 14
/
uuid.go
62 lines (53 loc) · 1.51 KB
/
uuid.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
// Copyright 2024 The Bucketeer Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package uuid
import (
"crypto/rand"
"errors"
"fmt"
"regexp"
)
var (
ErrIncorrectUUIDFormat = errors.New("uuid: format must be an uuid version 4")
// Version 4
uuidRegex = regexp.MustCompile(
"^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$",
)
)
// https://tools.ietf.org/html/rfc4122
type UUID [16]byte
func NewUUID() (*UUID, error) {
uuid := &UUID{}
if _, err := rand.Read(uuid[:]); err != nil {
return nil, err
}
uuid.setVariant()
uuid.setVersion()
return uuid, nil
}
func ValidateUUID(id string) error {
if !uuidRegex.MatchString(id) {
return ErrIncorrectUUIDFormat
}
return nil
}
func (uuid *UUID) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
}
func (uuid *UUID) setVariant() {
uuid[8] = (uuid[8] & 0x3f) | 0x80
}
func (uuid *UUID) setVersion() {
uuid[6] = (uuid[6] & 0x0f) | 0x40 // version 4
}