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72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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const _UUIDPattern = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
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export function isUUID(value: string): boolean {
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return _UUIDPattern.test(value);
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}
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// prep-work
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const _data = new Uint8Array(16);
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const _hex: string[] = [];
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for (let i = 0; i < 256; i++) {
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_hex.push(i.toString(16).padStart(2, '0'));
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}
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// todo@jrieken
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// 1. node nodejs use`crypto#randomBytes`, see: https://nodejs.org/docs/latest/api/crypto.html#crypto_crypto_randombytes_size_callback
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let _fillRandomValues: (bucket: Uint8Array) => Uint8Array;
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declare const crypto: undefined | { getRandomValues(data: Uint8Array): Uint8Array };
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if (typeof crypto === 'object' && typeof crypto.getRandomValues === 'function') {
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// browser
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_fillRandomValues = crypto.getRandomValues.bind(crypto);
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} else {
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_fillRandomValues = function (bucket: Uint8Array): Uint8Array {
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for (let i = 0; i < bucket.length; i++) {
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bucket[i] = Math.floor(Math.random() * 256);
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}
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return bucket;
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};
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}
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export function generateUuid(): string {
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// get data
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_fillRandomValues(_data);
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// set version bits
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_data[6] = (_data[6] & 0x0f) | 0x40;
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_data[8] = (_data[8] & 0x3f) | 0x80;
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// print as string
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let i = 0;
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let result = '';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += '-';
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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result += _hex[_data[i++]];
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return result;
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}
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