#Visor

Authentication and authorization library for angular.js

---

Visor is an authentication and authorization framework for AngularJS.
It provides a convenient way to authenticate on startup and define which routes are accessible to whom.
Visor works with both ngRoute and ui-router.

Quick start

Get Visor:

• download the release (or minified)
• via Bower: by running $ bower install visor from your console
• via NPM: by running $ npm install --save angular-visor from your console

Sample apps:

• A sample app using ui-router can be found here (source)
• A sample app using ng-route can be found here (source)

API documentation:

• API docs

###Authenticate with visor:

    angular.module("yourModule",["visor","ngRoute"]).
        configure(function(visorProvider,$routeProvider){
            visorProvider.authenticate = function($http){
                return $http.get(<your authentication url>).then(function(res){return res.data;}) //returns user
            };
            $routeProvider.when("/private",{
                restrict: function(user){ return user && user.can_see_private}
            })
        });

---

Overview and Features

Visor provides two main features:

Authentication:

• Visor allows you to stop routing until an authentication request is made.
• Visor guarantees that authentication info is available (via visor.authInfo) before any restricted route is accessed.
• If a client is not authenticated and tries to access an authenticated only route, it will be redirected to a designated login route.
• After an unauthenticated client logsin/signsup, Visor makes sure to redirect the user back to the orignal route requested.

Authorization:

• Visor works with both ngRoute and ui-router, and allows to idiomatically restrict access to routes in either modules.
• Unauthorized users are sent to a dedicated "access denied" route.
• Restrictions are simple functions defined on routes/states which can access the user's authentication info.

---

Usage

###Setting up the authenticate method

Visor requires that you define an authentication method that runs before restricted routes are accessed.
Visor exposes an authenticate method in it's provider:

    angular.module("yourModule",["visor"]).
        configure(function(visorProvider,$routeProvider){
            visorProvider.authenticate = function($http){
                return $http.get(<your authentication url>).then(function(res){return res.data;})
            };
        });

The authenticate method is dependency injected, and needs to return a promise.
The result from a successful promise will be sent to future restrict functions.

• By default Visor authenticates when the page is loaded even if a non restricted route is accessed, you can instruct Visor to only authenticate when a restricted route is accessed by setting the `visorProvider.authenticateOnStartup" flag.

###Defining restrictions on routes

To define certain routes to be restricted to certain users, Visor requires a "restrict" attribute to exist inside the route or state.
That function will be called with the value returned from the authenticate promise and should return a boolean indicating if the routing should continue.
If a user was not authenticated the restrict function will be called with no values.

ngRoute:

    angular.module("yourModule",["ngRoute"]).
        configure(function($routeProvider){
            $routeProvider.when("/private",{ // will only be shown to users that have `can_see_private`
                restrict: function(auth){ return auth && auth.can_see_private}
            })
            .when("/only_not_authenticated",{ // will only be shown to users who are not authenticated
                restrict: function(auth){ return auth === undefined}
            })
            .when("/public",{}); // will be shown to any user
        });

ui-router:

    angular.module("yourModule",["ui.router"]).
        configure(function($stateProvider){
            $stateProvider.state("private",{ // will only be shown to users that have `can_see_private`
                restrict: function(auth){ return auth && auth.can_see_private}
            })
            .state("only_not_authenticated",{ // will only be shown to users who are not authenticated
                restrict: function(auth){ return auth === undefined}
            })
            .state("public",{}); // will be shown to any user
        });

     Visor also respects restrictions in parent states.

    angular.module("yourModule",["ui.router"]).
        configure(function($stateProvider){
            $stateProvider.state("private",{ // will only be shown to users that have `can_see_private`
                restrict: function(auth){ return auth && auth.can_see_private}
            })
            .state("only_not_authenticated",{ // will only be shown to users that have `can_see_private`
                parent:"private"
            })
            .state("admin",{ // will only be shown to users who have both `can_see_private` and `is_admin`
                parent:"private",
                restrict: function(auth){ return auth && auth.is_admin}
            });
        });

Visor provides two default restriction methods as constants:

• authenticatedOnly - only users who are authenticated can see the route
• notForAuthenticated - only users who aren't authenticated can see the route

    angular.module("yourModule",["ngRoute"]).
        configure(function($routeProvider,authenticatedOnly,notForAuthenticated){
            $routeProvider.when("/private",{ // will only be shown to users that are authenticated
                restrict: authenticatedOnly
            })
            .when("/only_not_authenticated",{ // will only be shown to users who are not authenticated
                restrict: notForAuthenticated
            })
            .when("/public",{}); // will be shown to any user
        });

Configuring actions on events

Visor defines the following situations that can be overriden:

• An unauthenticated user tries to access a restricted route.

  • By default Visor will redirect to `/login' path.
  • The path can be overriden in visorProvider.loginRoute
  • The action taken when such an event occurs can be overriden in visorProvider.doOnNotAuthenticated
  • Visor adds a next parameter to the redirect to allow returning to the original path after a successful login.
  • You can instruct Visor to not add the next parameter by settings the visorProvider.shouldAddNext flag.

• An authenticated user tries to access a restricted route.

  • By default Visor will redirect to `/access_denied' path.
  • The path can be overriden in visorProvider.notAuthorizedRoute
  • The action taken when such an event occurs can be overriden in visorProvider.doOnNotAuthorized

• When a user is manually logged in.

  • By default if a next parameter exists in the url Visor will redirect to that path otherwise it'll redirect to `/' path.
  • The default path if no next is provided can be overriden in visorProvider.homeRoute
  • The action taken when such an event occurs can be overriden in visorProvider.doAfterManualAuthentication

###Login and Signup Visor needs to be notified when a user logs in to the application (as opposed to already being authenticated) in order for restrictions to work.
You inform visor when a user logs in by calling visor.setAuthenticated(authInfo).
The value sent to visor.isAuthenticated to be the same as the value returned in the authenticate promise.