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70 lines
1.2 KiB
70 lines
1.2 KiB
5 years ago
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package guid
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import (
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"crypto/rand"
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"encoding/json"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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var _ = (json.Marshaler)(&GUID{})
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var _ = (json.Unmarshaler)(&GUID{})
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type GUID [16]byte
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func New() GUID {
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g := GUID{}
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_, err := io.ReadFull(rand.Reader, g[:])
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if err != nil {
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panic(err)
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}
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return g
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}
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func (g GUID) String() string {
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return fmt.Sprintf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x-%02x", g[3], g[2], g[1], g[0], g[5], g[4], g[7], g[6], g[8:10], g[10:])
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}
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func FromString(s string) GUID {
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if len(s) != 36 {
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panic(fmt.Sprintf("invalid GUID length: %d", len(s)))
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}
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if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
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panic("invalid GUID format")
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}
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indexOrder := [16]int{
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0, 2, 4, 6,
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9, 11,
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14, 16,
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19, 21,
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24, 26, 28, 30, 32, 34,
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}
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byteOrder := [16]int{
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3, 2, 1, 0,
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5, 4,
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7, 6,
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8, 9,
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10, 11, 12, 13, 14, 15,
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}
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var g GUID
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for i, x := range indexOrder {
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b, err := strconv.ParseInt(s[x:x+2], 16, 16)
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if err != nil {
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panic(err)
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}
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g[byteOrder[i]] = byte(b)
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}
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return g
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}
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func (g GUID) MarshalJSON() ([]byte, error) {
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return json.Marshal(g.String())
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}
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func (g *GUID) UnmarshalJSON(data []byte) error {
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*g = FromString(strings.Trim(string(data), "\""))
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return nil
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}
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