AngularJs service interceptor to inject tokens in every request

addToken.js

(function(module) {

    var addToken = function(currentUser, $q) {

        return {
            request: function(config) {
                if (currentUser.profile.token) {
                    config.headers.Authorization = "Bearer " + currentUser.profile.token;
                }
                return $q.when(config);
            }
        };
    };

    module.factory("addToken", addToken);
    module.config(function($httpProvider) {
        $httpProvider.interceptors.push("addToken");
    });

})(angular.module("common"));

//CurrentUserService.js Service to manage users
(function(module) {

    var USERKEY = "utoken";

    var currentUser = function (localStorage) {

        var saveUser = function () {
            localStorage.add(USERKEY, profile);
        };

        var removeUser = function () {
            localStorage.remove(USERKEY);
        };

        var initialize = function() {
            var user = {
                username: "",
                token: "",
                get loggedIn() {
                    return this.token ? true : false;
                }
            };

            var localUser = localStorage.get(USERKEY);
            if (localUser) {
                user.username = localUser.username;
                user.token = localUser.token;
            }
            return user;
        }

        var profile = initialize();

        return {
            save: saveUser,
            remove: removeUser,
            profile: profile
        };
    };

    module.factory("currentUser", currentUser);

}(angular.module("common")));

//localStorage.js service to store data
(function(module) {

    var localStorage = function($window) {

        var store = $window.localStorage;

        var add = function (key, value) {
            value = angular.toJson(value);
            store.setItem(key, value);
        };

        var get = function(key) {
            var value = store.getItem(key);
            if (value) {
                value = angular.fromJson(value);
            }
            return value;
        };

        var remove = function(key) {
            store.removeItem(key);
        };

        return {
            add: add,
            get: get,
            remove: remove
        };
    };

    module.factory("localStorage", localStorage);

}(angular.module("common")));