mirror of
https://github.com/swc-project/swc.git
synced 2024-12-22 21:21:31 +03:00
72 lines
1.7 KiB
TypeScript
72 lines
1.7 KiB
TypeScript
// Loaded from https://deno.land/std/uuid/v5.ts
|
|
|
|
|
|
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
|
|
import {
|
|
bytesToUuid,
|
|
createBuffer,
|
|
stringToBytes,
|
|
uuidToBytes,
|
|
} from "./_common.ts";
|
|
import { Sha1 } from "../hash/sha1.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;
|
|
|
|
/**
|
|
* Validates the UUID v5.
|
|
* @param id UUID value.
|
|
*/
|
|
export function validate(id: string): boolean {
|
|
return UUID_RE.test(id);
|
|
}
|
|
|
|
/** The options used for generating a v5 uuid. */
|
|
export interface V5Options {
|
|
value: string | number[];
|
|
namespace: string | number[];
|
|
}
|
|
|
|
/**
|
|
* Generates a RFC4122 v5 UUID (SHA-1 namespace-based).
|
|
* @param options Can use a namespace and value to create SHA-1 hash.
|
|
* @param buf Can allow the UUID to be written in byte-form starting at the offset.
|
|
* @param offset Index to start writing on the UUID bytes in buffer.
|
|
*/
|
|
export function generate(
|
|
options: V5Options,
|
|
buf?: number[],
|
|
offset?: number,
|
|
): string | number[] {
|
|
const i = (buf && offset) || 0;
|
|
|
|
let { value, namespace } = options;
|
|
if (typeof value === "string") {
|
|
value = stringToBytes(value);
|
|
}
|
|
|
|
if (typeof namespace === "string") {
|
|
namespace = uuidToBytes(namespace);
|
|
}
|
|
|
|
assert(
|
|
namespace.length === 16,
|
|
"namespace must be uuid string or an Array of 16 byte values",
|
|
);
|
|
|
|
const content = namespace.concat(value);
|
|
const bytes = new Sha1().update(createBuffer(content)).digest();
|
|
|
|
bytes[6] = (bytes[6] & 0x0f) | 0x50;
|
|
bytes[8] = (bytes[8] & 0x3f) | 0x80;
|
|
|
|
if (buf !== undefined) {
|
|
for (let idx = 0; idx < 16; ++idx) {
|
|
buf[i + idx] = bytes[idx];
|
|
}
|
|
}
|
|
|
|
return buf ?? bytesToUuid(bytes);
|
|
}
|