module pattern

module.js

 // Module Pattern
 /*
  In Simple terms, Module pattern is a collection of functions in a object literal.
  */
 
 /*
  We will make a simple service to store and retrive data from localStorage.
 */

 (function() {
    'use strict';

    function authtoken() {
        
        var storage = $window.localStorage;
        var token = 'token';
        var cachedToken;
        // Works like a menu for all the APIs in this module
        var service = {
            setToken: setToken,
            getToken: getToken,
            removeToken: removeToken,
            removeAll: removeAll,
            authUser: authUser,
            isAuthenticated: isAuthenticated,
        };

        return service;

        function authUser(data) {
            setToken('username', data.name);
            setToken('token', data.token);
            
        }

        function setToken(key, token) {
            cachedToken = token;
            storage.setItem(key, token);
            
        }

        function removeToken(key) {
            cachedToken = null;
            storage.removeItem(key);
            
        }

        function removeAll () {
            storage.clear();
        }

        function getToken(key) {
            cachedToken = storage.getItem(key);
            return cachedToken;
        }
    
        function isAuthenticated() {
            return !!this.getToken(token);
        }
    }

})();