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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x 7x | /**
* Explain UUID and link to RFC here.
*
* @_subsection: api/utils:UUID [about-uuid]
*/
import { getBytes, hexlify } from "./data.js";
import type { BytesLike } from "./index.js";
/**
* Returns the version 4 [[link-uuid]] for the %%randomBytes%%.
*
* @see: https://www.ietf.org/rfc/rfc4122.txt (Section 4.4)
*/
export function uuidV4(randomBytes: BytesLike): string {
const bytes = getBytes(randomBytes, "randomBytes");
// Section: 4.1.3:
// - time_hi_and_version[12:16] = 0b0100
bytes[6] = (bytes[6] & 0x0f) | 0x40;
// Section 4.4
// - clock_seq_hi_and_reserved[6] = 0b0
// - clock_seq_hi_and_reserved[7] = 0b1
bytes[8] = (bytes[8] & 0x3f) | 0x80;
const value = hexlify(bytes);
return [
value.substring(2, 10),
value.substring(10, 14),
value.substring(14, 18),
value.substring(18, 22),
value.substring(22, 34),
].join("-");
}
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