goext/langext/uuid.go

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2022-10-27 16:48:26 +02:00
package langext
import (
"crypto/rand"
"encoding/hex"
"io"
"strings"
)
func NewUUID() ([16]byte, error) {
var uuid [16]byte
_, err := io.ReadFull(rand.Reader, uuid[:])
if err != nil {
return [16]byte{}, err
}
uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
return uuid, nil
}
func NewHexUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
var dst = make([]byte, 36)
hex.Encode(dst, uuid[:4])
dst[8] = '-'
hex.Encode(dst[9:13], uuid[4:6])
dst[13] = '-'
hex.Encode(dst[14:18], uuid[6:8])
dst[18] = '-'
hex.Encode(dst[19:23], uuid[8:10])
dst[23] = '-'
hex.Encode(dst[24:], uuid[10:])
return string(dst), nil
}
func NewUpperHexUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
var dst = make([]byte, 36)
hex.Encode(dst, uuid[:4])
dst[8] = '-'
hex.Encode(dst[9:13], uuid[4:6])
dst[13] = '-'
hex.Encode(dst[14:18], uuid[6:8])
dst[18] = '-'
hex.Encode(dst[19:23], uuid[8:10])
dst[23] = '-'
hex.Encode(dst[24:], uuid[10:])
return strings.ToUpper(string(dst)), nil
}
func NewRawHexUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
var dst = make([]byte, 32)
hex.Encode(dst, uuid[:4])
hex.Encode(dst[8:12], uuid[4:6])
hex.Encode(dst[12:16], uuid[6:8])
hex.Encode(dst[16:20], uuid[8:10])
hex.Encode(dst[20:], uuid[10:])
return strings.ToUpper(string(dst)), nil
}
func NewBracesUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}
var dst = make([]byte, 38)
dst[0] = '{'
hex.Encode(dst, uuid[:5])
dst[9] = '-'
hex.Encode(dst[10:14], uuid[4:6])
dst[14] = '-'
hex.Encode(dst[15:19], uuid[6:8])
dst[19] = '-'
hex.Encode(dst[20:24], uuid[8:10])
dst[24] = '-'
hex.Encode(dst[25:], uuid[10:])
dst[37] = '}'
return strings.ToUpper(string(dst)), nil
}
func NewParensUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
var dst = make([]byte, 38)
dst[0] = '('
hex.Encode(dst, uuid[:5])
dst[9] = '-'
hex.Encode(dst[10:14], uuid[4:6])
dst[14] = '-'
hex.Encode(dst[15:19], uuid[6:8])
dst[19] = '-'
hex.Encode(dst[20:24], uuid[8:10])
dst[24] = '-'
hex.Encode(dst[25:], uuid[10:])
dst[37] = ')'
return strings.ToUpper(string(dst)), nil
}