utils/node_modules/validator/es/lib/normalizeEmail.js

import merge from './util/merge';
var default_normalize_email_options = {
  // The following options apply to all email addresses
  // Lowercases the local part of the email address.
  // Please note this may violate RFC 5321 as per http://stackoverflow.com/a/9808332/192024).
  // The domain is always lowercased, as per RFC 1035
  all_lowercase: true,
  // The following conversions are specific to GMail
  // Lowercases the local part of the GMail address (known to be case-insensitive)
  gmail_lowercase: true,
  // Removes dots from the local part of the email address, as that's ignored by GMail
  gmail_remove_dots: true,
  // Removes the subaddress (e.g. "+foo") from the email address
  gmail_remove_subaddress: true,
  // Conversts the googlemail.com domain to gmail.com
  gmail_convert_googlemaildotcom: true,
  // The following conversions are specific to Outlook.com / Windows Live / Hotmail
  // Lowercases the local part of the Outlook.com address (known to be case-insensitive)
  outlookdotcom_lowercase: true,
  // Removes the subaddress (e.g. "+foo") from the email address
  outlookdotcom_remove_subaddress: true,
  // The following conversions are specific to Yahoo
  // Lowercases the local part of the Yahoo address (known to be case-insensitive)
  yahoo_lowercase: true,
  // Removes the subaddress (e.g. "-foo") from the email address
  yahoo_remove_subaddress: true,
  // The following conversions are specific to Yandex
  // Lowercases the local part of the Yandex address (known to be case-insensitive)
  yandex_lowercase: true,
  // The following conversions are specific to iCloud
  // Lowercases the local part of the iCloud address (known to be case-insensitive)
  icloud_lowercase: true,
  // Removes the subaddress (e.g. "+foo") from the email address
  icloud_remove_subaddress: true
}; // List of domains used by iCloud

var icloud_domains = ['icloud.com', 'me.com']; // List of domains used by Outlook.com and its predecessors
// This list is likely incomplete.
// Partial reference:
// https://blogs.office.com/2013/04/17/outlook-com-gets-two-step-verification-sign-in-by-alias-and-new-international-domains/

var outlookdotcom_domains = ['hotmail.at', 'hotmail.be', 'hotmail.ca', 'hotmail.cl', 'hotmail.co.il', 'hotmail.co.nz', 'hotmail.co.th', 'hotmail.co.uk', 'hotmail.com', 'hotmail.com.ar', 'hotmail.com.au', 'hotmail.com.br', 'hotmail.com.gr', 'hotmail.com.mx', 'hotmail.com.pe', 'hotmail.com.tr', 'hotmail.com.vn', 'hotmail.cz', 'hotmail.de', 'hotmail.dk', 'hotmail.es', 'hotmail.fr', 'hotmail.hu', 'hotmail.id', 'hotmail.ie', 'hotmail.in', 'hotmail.it', 'hotmail.jp', 'hotmail.kr', 'hotmail.lv', 'hotmail.my', 'hotmail.ph', 'hotmail.pt', 'hotmail.sa', 'hotmail.sg', 'hotmail.sk', 'live.be', 'live.co.uk', 'live.com', 'live.com.ar', 'live.com.mx', 'live.de', 'live.es', 'live.eu', 'live.fr', 'live.it', 'live.nl', 'msn.com', 'outlook.at', 'outlook.be', 'outlook.cl', 'outlook.co.il', 'outlook.co.nz', 'outlook.co.th', 'outlook.com', 'outlook.com.ar', 'outlook.com.au', 'outlook.com.br', 'outlook.com.gr', 'outlook.com.pe', 'outlook.com.tr', 'outlook.com.vn', 'outlook.cz', 'outlook.de', 'outlook.dk', 'outlook.es', 'outlook.fr', 'outlook.hu', 'outlook.id', 'outlook.ie', 'outlook.in', 'outlook.it', 'outlook.jp', 'outlook.kr', 'outlook.lv', 'outlook.my', 'outlook.ph', 'outlook.pt', 'outlook.sa', 'outlook.sg', 'outlook.sk', 'passport.com']; // List of domains used by Yahoo Mail
// This list is likely incomplete

var yahoo_domains = ['rocketmail.com', 'yahoo.ca', 'yahoo.co.uk', 'yahoo.com', 'yahoo.de', 'yahoo.fr', 'yahoo.in', 'yahoo.it', 'ymail.com']; // List of domains used by yandex.ru

var yandex_domains = ['yandex.ru', 'yandex.ua', 'yandex.kz', 'yandex.com', 'yandex.by', 'ya.ru']; // replace single dots, but not multiple consecutive dots

function dotsReplacer(match) {
  if (match.length > 1) {
    return match;
  }

  return '';
}

export default function normalizeEmail(email, options) {
  options = merge(options, default_normalize_email_options);
  var raw_parts = email.split('@');
  var domain = raw_parts.pop();
  var user = raw_parts.join('@');
  var parts = [user, domain]; // The domain is always lowercased, as it's case-insensitive per RFC 1035

  parts[1] = parts[1].toLowerCase();

  if (parts[1] === 'gmail.com' || parts[1] === 'googlemail.com') {
    // Address is GMail
    if (options.gmail_remove_subaddress) {
      parts[0] = parts[0].split('+')[0];
    }

    if (options.gmail_remove_dots) {
      // this does not replace consecutive dots like example..email@gmail.com
      parts[0] = parts[0].replace(/\.+/g, dotsReplacer);
    }

    if (!parts[0].length) {
      return false;
    }

    if (options.all_lowercase || options.gmail_lowercase) {
      parts[0] = parts[0].toLowerCase();
    }

    parts[1] = options.gmail_convert_googlemaildotcom ? 'gmail.com' : parts[1];
  } else if (icloud_domains.indexOf(parts[1]) >= 0) {
    // Address is iCloud
    if (options.icloud_remove_subaddress) {
      parts[0] = parts[0].split('+')[0];
    }

    if (!parts[0].length) {
      return false;
    }

    if (options.all_lowercase || options.icloud_lowercase) {
      parts[0] = parts[0].toLowerCase();
    }
  } else if (outlookdotcom_domains.indexOf(parts[1]) >= 0) {
    // Address is Outlook.com
    if (options.outlookdotcom_remove_subaddress) {
      parts[0] = parts[0].split('+')[0];
    }

    if (!parts[0].length) {
      return false;
    }

    if (options.all_lowercase || options.outlookdotcom_lowercase) {
      parts[0] = parts[0].toLowerCase();
    }
  } else if (yahoo_domains.indexOf(parts[1]) >= 0) {
    // Address is Yahoo
    if (options.yahoo_remove_subaddress) {
      var components = parts[0].split('-');
      parts[0] = components.length > 1 ? components.slice(0, -1).join('-') : components[0];
    }

    if (!parts[0].length) {
      return false;
    }

    if (options.all_lowercase || options.yahoo_lowercase) {
      parts[0] = parts[0].toLowerCase();
    }
  } else if (yandex_domains.indexOf(parts[1]) >= 0) {
    if (options.all_lowercase || options.yandex_lowercase) {
      parts[0] = parts[0].toLowerCase();
    }

    parts[1] = 'yandex.ru'; // all yandex domains are equal, 1st preferred
  } else if (options.all_lowercase) {
    // Any other address
    parts[0] = parts[0].toLowerCase();
  }

  return parts.join('@');
}