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|
package state
import (
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
)
type ID [16]byte
var (
ErrInvalidLength = errors.New("string representation must have a length of 32")
)
func (a *ID) String() string {
return hex.EncodeToString(a[:])
}
func NewAppID(id *ID) error {
_, err := rand.Read(id[:])
return err
}
func ParseAppID(id *ID, s string) error {
if len(s) != 32 {
return ErrInvalidLength
}
for i, b := range s {
if b < '0' || b > 'f' {
return fmt.Errorf("invalid char %q at byte %d", b, i)
}
v := uint8(b)
if v > '9' {
v = 10 + v - 'a'
} else {
v -= '0'
}
if i%2 == 0 {
v <<= 4
}
id[i/2] += v
}
return nil
}
|
