@react-keycloak/keycloak-ts/lib/module/utils/uuid.js

Keycloak typescript adapter

/* eslint-disable no-useless-escape */
import { fromByteArray } from 'base64-js';
import { sha256 } from 'js-sha256';

function generateRandomString(len, alphabet) {
  const randomData = generateRandomData(len);
  const chars = [...Array(len)].map((_, idx) => alphabet.charCodeAt(randomData[idx] % alphabet.length));
  return String.fromCharCode.apply(null, chars);
}

function generateRandomData(len) {
  return [...Array(len)].map(() => Math.floor(256 * Math.random()));
}

export function generateCodeVerifier(len) {
  return generateRandomString(len, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789');
}
const hexDigits = '0123456789abcdef';
export function createUUID() {
  const s = generateRandomString(36, hexDigits).split('');
  s[14] = '4'; // eslint-disable-next-line no-bitwise

  s[19] = hexDigits.substr(s[19] & 0x3 | 0x8, 1);
  s[8] = s[13] = s[18] = s[23] = '-';
  return s.join('');
}
export function generatePkceChallenge(pkceMethod, codeVerifier) {
  switch (pkceMethod) {
    // The use of the "plain" method is considered insecure and therefore not supported.
    case 'S256':
      // hash codeVerifier, then encode as url-safe base64 without padding
      const hashBytes = new Uint8Array(sha256.arrayBuffer(codeVerifier));
      const encodedHash = fromByteArray(hashBytes).replace(/\+/g, '-').replace(/\//g, '_').replace(/\=/g, '');
      return encodedHash;

    default:
      throw 'Invalid value for pkceMethod';
  }
}
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