cloudworker-proxy/examples/serverless/node_modules/@serverless/utils-china/library/uuid.js

An api gateway for cloudflare workers

'use strict';

const crypto = require('crypto');

function rng() {
  return crypto.randomBytes(16);
}

const byteToHex = [];
for (let i = 0; i < 256; ++i) {
  byteToHex[i] = (i + 0x100).toString(16).substr(1);
}

function bytesToUuid(buf, offset) {
  let i = offset || 0;
  const bth = byteToHex;
  // join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
  return [
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
    '-',
    bth[buf[i++]],
    bth[buf[i++]],
    '-',
    bth[buf[i++]],
    bth[buf[i++]],
    '-',
    bth[buf[i++]],
    bth[buf[i++]],
    '-',
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
    bth[buf[i++]],
  ].join('');
}

function v4(options, buf, offset) {
  const i = (buf && offset) || 0;

  if (typeof options === 'string') {
    buf = options === 'binary' ? new Array(16) : null;
    options = null;
  }
  options = options || {};

  const rnds = options.random || (options.rng || rng)();

  // Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
  rnds[6] = (rnds[6] & 0x0f) | 0x40;
  rnds[8] = (rnds[8] & 0x3f) | 0x80;

  // Copy bytes to buffer, if provided
  if (buf) {
    for (let ii = 0; ii < 16; ++ii) {
      buf[i + ii] = rnds[ii];
    }
  }

  return buf || bytesToUuid(rnds);
}

module.exports = v4;