fast-key-generator/index.js

Simple utils library for key generation.

/**
 * @format
 */

var alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
var numeric = "0123456789";
var symbols = "'[?>#](<%+.^_,\")!|;*`}/@~-&{=:$\\";
var alphanum = alpha.concat(numeric);

var charsets = {
  alpha: alpha,
  alphanum: alphanum,
  numeric: numeric,
  symbols: symbols
};

var transforms = {
  none: String.prototype.toString,
  lower: String.prototype.toLowerCase,
  upper: String.prototype.toUpperCase
};

var initialOptions = {
  size: 16,
  prefix: "",
  exclude: [],
  chartype: "alpha",
  transform: "none",
  validate: function() {
    return true;
  }
};

function generateKey(options) {
  var settings = Object.assign({}, initialOptions, options || {});
  var key = "";

  var charset = settings.charset
    ? settings.charset
    : charsets[settings.chartype];

  var size =
    settings.size > 0 && isFinite(settings.size)
      ? parseInt(settings.size, 10) | 0
      : 0;

  var transform =
    typeof settings.transform === "function"
      ? settings.transform
      : transforms[settings.transform];

  while (size--) {
    key = charset.charAt((Math.random() * charset.length) | 0).concat(key);
  }

  key = settings.prefix.concat(transform.call(key, key) || "");

  return !settings.validate(key) || settings.exclude.indexOf(key) !== -1
    ? generateKey(settings)
    : key;
}

module.exports = {
  generateKey: generateKey
};