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Copy pathuuid.ts
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61 lines (53 loc) · 1.77 KB
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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
const _UUIDPattern = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
export function isUUID(value: string): boolean {
return _UUIDPattern.test(value);
}
// prep-work
const _data = new Uint8Array(16);
const _hex: string[] = [];
for (let i = 0; i < 256; i++) {
_hex.push(i.toString(16).padStart(2, '0'));
}
// todo@joh node nodejs use `crypto#randomBytes`, see: https://nodejs.org/docs/latest/api/crypto.html#crypto_crypto_randombytes_size_callback
// todo@joh use browser-crypto
const _fillRandomValues = function (bucket: Uint8Array): Uint8Array {
for (let i = 0; i < bucket.length; i++) {
bucket[i] = Math.floor(Math.random() * 256);
}
return bucket;
};
export function generateUuid(): string {
// get data
_fillRandomValues(_data);
// set version bits
_data[6] = (_data[6] & 0x0f) | 0x40;
_data[8] = (_data[8] & 0x3f) | 0x80;
// print as string
let i = 0;
let result = '';
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += '-';
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += '-';
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += '-';
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += '-';
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
result += _hex[_data[i++]];
return result;
}