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std/uuid/v5.ts

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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { bytesToUuid, createBuffer, stringToBytes, uuidToBytes,} from "./_common.ts";import { Sha1 } from "../hash/sha1.ts";import { isString } from "../node/util.ts";import { assert } from "../_util/assert.ts";
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
export function validate(id: string): boolean { return UUID_RE.test(id);}
interface V5Options { value: string | number[]; namespace: string | number[];}
export function generate( options: V5Options, buf?: number[], offset?: number,): string | number[] { const i = (buf && offset) || 0;
let { value, namespace } = options; if (isString(value)) value = stringToBytes(value as string); if (isString(namespace)) namespace = uuidToBytes(namespace as string); assert( namespace.length === 16, "namespace must be uuid string or an Array of 16 byte values", );
const content = (namespace as number[]).concat(value as number[]); const bytes = new Sha1().update(createBuffer(content)).digest();
bytes[6] = (bytes[6] & 0x0f) | 0x50; bytes[8] = (bytes[8] & 0x3f) | 0x80;
if (buf) { for (let idx = 0; idx < 16; ++idx) { buf[i + idx] = bytes[idx]; } }
return buf || bytesToUuid(bytes);}