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denoland-deno/std/uuid/v4.ts

25 lines
657 B
TypeScript

// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { bytesToUuid } from "./_common.ts";
const UUID_RE = new RegExp(
"^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$",
"i",
);
/**
* Validates the UUID v4
* @param id UUID value
*/
export function validate(id: string): boolean {
return UUID_RE.test(id);
}
/** Generates a RFC4122 v4 UUID (pseudo-randomly-based) */
export function generate(): string {
const rnds = crypto.getRandomValues(new Uint8Array(16));
rnds[6] = (rnds[6] & 0x0f) | 0x40; // Version 4
rnds[8] = (rnds[8] & 0x3f) | 0x80; // Variant 10
return bytesToUuid(rnds);
}