br-cnpj-validator.html

<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-validator-behavior/iron-validator-behavior.html">

<script>
  Polymer({
    is: 'br-cnpj-validator',
    behaviors: [
      Polymer.IronValidatorBehavior
    ],
    validate: function(value) {
      var stripped = (value || "").toString().replace(/[-\/.]/g, "");
      
      // CNPJ must be defined
      if (!stripped) return false;
      // CNPJ must have 14 chars
      if (stripped.length !== 14) return false;
      // CNPJ can't be blacklisted
      if (this._blacklist.indexOf(stripped) >= 0) return false;
      var numbers = stripped.substr(0, 12);
      numbers += this._verifierDigit(numbers);
      numbers += this._verifierDigit(numbers);
      return numbers.substr(-2) === stripped.substr(-2);
    },
    _verifierDigit: function (numbers) {
      var index = 2;
      var reverse = numbers.split("").reduce(function(buffer, number) {
        return [parseInt(number, 10)].concat(buffer);
      }, []);
      var sum = reverse.reduce(function(buffer, number) {
        buffer += number * index;
        index = (index === 9 ? 2 : index + 1);
        return buffer;
      }, 0);
      var mod = sum % 11;
      return (mod < 2 ? 0 : 11 - mod);
    },
    // Blacklist common values.
    _blacklist: [
      "00000000000000",
      "11111111111111",
      "22222222222222",
      "33333333333333",
      "44444444444444",
      "55555555555555",
      "66666666666666",
      "77777777777777",
      "88888888888888",
      "99999999999999"
    ]
  });
</script>