vole
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31df8bae
Keenan Nemetz
17d ago
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1 | // Package id generates ULIDs: 26 characters of Crockford base32, the first 48 |
| 2 | // bits a millisecond timestamp. They are client-generated so nothing has to be | |
| 3 | // assigned server-side, and they sort by creation time. | |
| 4 | package id | |
| 5 | ||
| 6 | import ( | |
| 7 | "crypto/rand" | |
| 8 | "regexp" | |
| 9 | "time" | |
| 10 | ) | |
| 11 | ||
| 12 | const alphabet = "0123456789ABCDEFGHJKMNPQRSTVWXYZ" | |
| 13 | ||
| 14 | var re = regexp.MustCompile(`^[0-9A-HJKMNP-TV-Z]{26}$`) | |
| 15 | ||
| 16 | // New returns a ULID for t. | |
| 17 | func New(t time.Time) (string, error) { | |
| 18 | var out [26]byte | |
| 19 | ms := uint64(t.UnixMilli()) | |
| 20 | for i := 9; i >= 0; i-- { | |
| 21 | out[i] = alphabet[ms&31] | |
| 22 | ms >>= 5 | |
| 23 | } | |
| 24 | b := make([]byte, 16) | |
| 25 | if _, err := rand.Read(b); err != nil { | |
| 26 | return "", err | |
| 27 | } | |
| 28 | var acc uint32 | |
| 29 | var bits uint | |
| 30 | pos := 10 | |
| 31 | for _, x := range b { | |
| 32 | acc = acc<<8 | uint32(x) | |
| 33 | bits += 8 | |
| 34 | for bits >= 5 && pos < 26 { | |
| 35 | bits -= 5 | |
| 36 | out[pos] = alphabet[(acc>>bits)&31] | |
| 37 | pos++ | |
| 38 | } | |
| 39 | } | |
| 40 | return string(out[:]), nil | |
| 41 | } | |
| 42 | ||
| 43 | // Valid reports whether s is a well-formed ULID. | |
| 44 | func Valid(s string) bool { return re.MatchString(s) } |