gmail-equivalence-test.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const
assert = require('assert'),
gmailEq = require('../lib/gmail_compare.js'),
vows = require('vows');

var suite = vows.describe('Gmail Equivalence');
suite.addBatch({
  'Identical valid addresses are equivalent': function() {
    assert.isTrue(gmailEq('alice@gmail.com', 'alice@gmail.com'));
  },
  'Identical invalid addresses are not equivalent': function() {
    assert.isFalse(gmailEq('alice-at-gmail.com', 'alice-at-gmail.com'));
    assert.isFalse(gmailEq('alice@@gmail.com', 'alice@@gmail.com'));
    assert.isFalse(gmailEq('', ''));
    assert.isFalse(gmailEq(false, false));
    assert.isFalse(gmailEq(undefined, undefined));
  },
  'Case is ignored': function() {
    assert.isTrue(gmailEq('Alice@gmail.com', 'ALiCE@gmail.com'));
  },
  'Dots are ignored': {
    'in the local part': function() {
      assert.isTrue(gmailEq('a.l.i.c.e@gmail.com', 'al.ice@gmail.com'));
    },
    'but not on the right hand side': function() {
      assert.isFalse(gmailEq('alice@gmail.com', 'alice@g.mail.com'));
    },
  },
  'Plus addresses are ignored': function() {
    assert.isTrue(gmailEq('alice+foo@gmail.com', 'alice+bar@gmail.com'));
  },
  'Gmail and Googlemail are interchangable': function() {
    assert.isTrue(gmailEq('alice@gmail.com', 'alice@googlemail.com'));
  }
});

if (process.argv[1] === __filename) {
  suite.run();
} else {
  suite.export(module);
}

gmail_compare.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const
valid = require('./validation/email.js');

function gmailUser(s) {
  // Normalize case
  s = s.toLowerCase();

  var parts = s.split('@');
  var lhs = parts[0];
  var rhs = parts[1];

  // Ignore dots
  lhs = lhs.replace(/\./g, '');

  // Trim plus addresses
  if (lhs.indexOf('+') > -1) {
    lhs = lhs.slice(0, lhs.indexOf('+'));
  }

  // Normalize googlemail.com to gmail.com
  if (rhs === 'googlemail.com') {
    rhs = 'gmail.com';
  }

  return lhs + '@' + rhs;
}

module.exports = function (a, b) {
  // Both arguments must be valid email addresses
  if (!valid(a) || !valid(b)) {
    return false;
  }

  a = gmailUser(a);
  b = gmailUser(b);

  return a === b;
};