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57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
// Copyright (c) 2022 Shivaram Lingamneni <slingamn@cs.stanford.edu>
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// released under the MIT license
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package utils
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import (
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"crypto/rand"
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"encoding/base64"
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"errors"
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)
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var (
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ErrInvalidUUID = errors.New("Invalid uuid")
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)
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// Technically a UUIDv4 has version bits set, but this doesn't matter in practice
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type UUID [16]byte
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func (u UUID) MarshalJSON() (b []byte, err error) {
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b = make([]byte, 24)
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b[0] = '"'
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base64.RawURLEncoding.Encode(b[1:], u[:])
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b[23] = '"'
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return
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}
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func (u *UUID) UnmarshalJSON(b []byte) (err error) {
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if len(b) != 24 {
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return ErrInvalidUUID
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}
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readLen, err := base64.RawURLEncoding.Decode(u[:], b[1:23])
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if err != nil || readLen != 16 {
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return ErrInvalidUUID
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}
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return nil
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}
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func (u *UUID) String() string {
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return base64.RawURLEncoding.EncodeToString(u[:])
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}
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func GenerateUUIDv4() (result UUID) {
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_, err := rand.Read(result[:])
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if err != nil {
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panic(err)
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}
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return
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}
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func DecodeUUID(ustr string) (result UUID, err error) {
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length, err := base64.RawURLEncoding.Decode(result[:], []byte(ustr))
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if err == nil && length != 16 {
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err = ErrInvalidUUID
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}
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return
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}
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