uuid3-by-string/src/index.js

Generating uuid-hash from string

var lib = require('./lib');

/** Uin8Array with zero items */
var EMPTY_UINT8_ARRAY = new Uint8Array(0);

/**
 * Generates the Name-Based UUID hashes v3 and v5 according to RFC-4122
 * https://tools.ietf.org/html/rfc4122#section-4.3
 * @param {string} target Hashing target
 * @param {string} [namespace] Some name space within which generation occurs
 * @returns {string} UUID
 */
function generateUuid(target, namespace) {
  if (typeof target !== 'string') {
    throw TypeError('Value must be string');
  }

  // Parsing target chars
  var charBuffer = lib.stringToCharBuffer(target);

  // TODO: Test namespace for uuid and parse to buffer
  var namespaceCharBuffer = typeof namespace === 'string' ? lib.stringToCharBuffer(namespace) : EMPTY_UINT8_ARRAY;

  // Concatenation two buffers of strings to one
  var buffer = lib.concatBuffers(namespaceCharBuffer, charBuffer);

  // Getting hash
  var hash = lib.md5Hash(buffer)

  return lib.hashToUuid(hash, 3);
}

/**
 * Export module
 */
module.exports = generateUuid;