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