myApp.factory('AuthInterceptor', ['$window', '$q', '$log',
    function($window, $q, $log) {
        $log.debug('start AuthInterceptor');
        return {
            request: function(config) {
                config.headers = config.headers || {};
                if ($window.localStorage.getItem('key')) {
                    config.headers.Authorization = 'Token ' + $window.localStorage.getItem('key');
                }
                return config || $q.when(config);
            },
            response: function(response) {
                if (response.status === 401) {
                    $log.debug('Hey! I"m javascript. Authorization is needed!');
                }
                return response || $q.when(response);
            }
        };
    }
]);

myApp.config(['$locationProvider', '$stateProvider', '$urlRouterProvider', '$httpProvider',
    function($locationProvider, $stateProvider, $urlRouterProvider, $httpProvider) {

        // Authorization interceptor
        $httpProvider.interceptors.push('AuthInterceptor');

    }
]);