AngularJS EMBG Custom Validator

embg.html

<!-- EMBG field which is optional -->
<md-input-container>
    <label>ЕМБГ</label>
    <input ng-model="vm.embg" 
            mk-valid-embg 
            maxlength="13"
            name="embg" 
            autocomplete="off">
    <div ng-messages="form.embg.$error">
        <div ng-message="embg">Внесете валиден ЕМБГ</div>
    </div>
</md-input-container>

<!-- EMBG field which is required -->
<md-input-container>
    <label>ЕМБГ</label>
    <input ng-model="vm.embg" 
            mk-valid-embg 
            required
            maxlength="13"
            name="embg" 
            autocomplete="off">
    <div ng-messages="form.embg.$error">
        <div ng-message="required">Внесете ЕМБГ<div>
        <div ng-message="embg">Внесете валиден ЕМБГ</div>
    </div>
</md-input-container>

embg.js

(function () {
    'use strict';

    angular
        .module('mk.directives') // replace this with your specific module
        .directive('mkValidEmbg', validEmbg); // replace this with your preferred directive name

    validEmbg.$inject = [];

    function validEmbg() {
        var directive = {
            link: link,
            require: 'ngModel',
            restrict: 'A'
        };
        return directive;

        function link(scope, element, attrs, ctrl) {
            function embgValidator(embg) {
                // I prefer to have this as there is already a specific directive for required fields
                // you can combine this directive with ng-required if you are making the field required
                if (!embg) {
                    return true;
                }

                // check if it is of correct length
                // check if it contains only numbers
                if (!/^[0-9]{13}$/.test(embg)) {
                    return false;
                }

                // check the checksum
                if (!isValidCheckSum(embg)) {
                    return false;
                }
                
                // check if it is a valid date
                if (!isValidDate(embg)) {
                    return false;
                }

                return true;
            }

            ctrl.$validators.embg = function (ngModelValue) {
                return embgValidator(ngModelValue);
            };
        }

        function isValidCheckSum(embg) {
            var mask = '765432765432',
                sum = 0,
                K = parseInt(embg[embg.length - 1]);
            for (var i = 0; i < 12; ++i) {
                sum += parseInt(embg[i]) * parseInt(mask[i]);
            }
            var m = 11 - sum % 11;
            if (m >= 10) {
                m = 0;
            }
            return m == K;
        }

        function isValidDate(embg) {
            // it works for dates within the years 1800-2700
            // hopefully your software works until that date and this becomes a problem
            var d = parseInt(embg.substr(0, 2)),
                m = parseInt(embg.substr(2, 2)) - 1, // m is 0 indexed for the calculations (0-11)
                y = parseInt(embg.substr(4, 3)) + 1000;

            if (parseInt(embg.substr(4, 1)) < 8) {
                y += 1000;
            }

            return m >= 0 && m < 12 && d > 0 && d <= daysInMonth(m, y) && y > 1800 && y <= moment().year();
        }

        function daysInMonth(m, y) {
            switch (m) {
                case 1:
                    return (y % 4 === 0 && y % 100) || y % 400 === 0 ? 29 : 28;
                case 8: case 3: case 5: case 10:
                    return 30;
                default:
                    return 31;
            }
        }
    }
})();

На линија 54 имаш грешка, треба да е <12 место <=12 😄

Поправено! :)
Сум го оставил овој gist-ов вака, а проверувам веднаш во апликација и гледам таму веќе сум го поправил кодот...
Фала на коментарот. Треба да си бидат сепак овие gist-овите точни!