AngularJs: OAuth 2.0 Refresh Token

config.js

(function(){
	
	angular.module('app', [])
	.config(['$httpProvider', function($httpProvider) {
	  $httpProvider.interceptors.push(['$q', '$window', '$timeout', '$injector', function ($q, $window, $timeout, $injector) {
	    var $login, $http, $auth;
      $timeout(function () {
        $login = $injector.get('$login');
        $http = $injector.get('$http');
        $auth = $injector.get('$auth');
      });

      return {
        'request': function (config) {
          config.headers = config.headers || {};
          var token = JSON.parse($window.localStorage.token || null);

          if(token){
          	// if token expire
          	if(token.expire && token.expire < Date.now()){
          		// re-new token
          		return $auth.refresh()
          		.then(function(token){
          			config.headers.Authorization = (token.type || 'Bearer') + token.access;
          			return config;
          		});
          	} else if (token.access) {
                config.headers.Authorization = (token.type || 'Bearer') + token.access;
            }
          }
          return config;
        },
        'responseError': function (response) {
          if (response.status === 401 || response.status === 403) {

              return $auth.refresh()
                .then(function () {
                  return $http(response.config);
                })
                .catch(function () {
                  return $q.reject(response);
                });
          }
          return $q.reject(response);
        }
      };
    }]);

	}])
	.provider('$auth', function($http, $window){
	  
		return {
			login:function(){
				// TODO: login
			},
			logout:function(){				
				window.localStorage.removeItem('token');
			},
			refresh: function(){
				var token = JSON.parse($window.localStorage.token || null);
				
				return $http.post('/auth/refresh', {
					accessToken: token.accessToken,
					refreshToken: token.refreshToken
				})
				.then(function(res) {
					var token = {
						access: res.data.access_token,
						refresh: res.data.refresh_token,
						type: res.data.token_type,
						expire: Date.now()+ parseInt(res.data.expires_in)*1000 // calculate time of expire
					};
					$window.localStorage.token = JSON.stringify(token);
					return token;
				});
			}
		}
	});

})();

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