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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 { 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);
}
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 as string);
}
if (typeof namespace == "string") {
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);
}
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