Utilities for uuids on the client side.

uuid-util.ts

import _ from 'lodash';

export namespace uuidUtil {
  const regexExp = /^[0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}$/gi;

  export function isValidUuid(s: string) {
    if (!_.isString(s)) {
      return false;
    }
    if (_.isEmpty(s)) {
      return false;
    }
    return regexExp.test(s);
  }

  export const randomUuid: () => string = (() => {
    if (typeof window !== 'undefined' && window.crypto) {
      if (window.crypto.randomUUID) {
        return window.crypto.randomUUID();
      }
      if (!!window.crypto.getRandomValues) {
        return '10000000-1000-4000-8000-100000000000'.replace(/[018]/g, c =>
          // @ts-ignore
          (c ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16),
        );
      }
    }
    // noinspection SpellCheckingInspection
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
      const r = (Math.random() * 16) | 0;
      const v = String(c) === 'x' ? r : (r & 0x3) | 0x8;
      return v.toString(16);
    });
  }) as any;
}