normalize-email/index.js at master · johno/normalize-email · GitHub

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'use strict';

var PLUS_ONLY = /\+.*$/;
var PLUS_AND_DOT = /\.|\+.*$/g;
var normalizeableProviders = {
  'gmail.com': {
    'cut': PLUS_AND_DOT
  },
  'googlemail.com': {
    'cut': PLUS_AND_DOT,
    'aliasOf': 'gmail.com'
  },
  'hotmail.com': {
    'cut': PLUS_ONLY
  },
  'live.com': {
    'cut': PLUS_AND_DOT
  },
  'outlook.com': {
    'cut': PLUS_ONLY
  }
};

module.exports = function normalizeEmail(eMail) {
  if (typeof eMail != 'string') {
    throw new TypeError('normalize-email expects a string');
  }

  var email = eMail.toLowerCase();
  var emailParts = email.split(/@/);

  if (emailParts.length !== 2) {
    return eMail;
  }

  var username = emailParts[0];
  var domain = emailParts[1];

  if (normalizeableProviders.hasOwnProperty(domain)) {
    if (normalizeableProviders[domain].hasOwnProperty('cut')) {
      username = username.replace(normalizeableProviders[domain].cut, '');
    }
    if (normalizeableProviders[domain].hasOwnProperty('aliasOf')) {
      domain = normalizeableProviders[domain].aliasOf;
    }
  }

  return username + '@' + domain;
}