Redirect From Action Filter Attribute

Question

What is the best way to do a redirect in an ActionFilterAttribute   I have an ActionFilterAttribute called IsAuthenticatedAttributeFilter and that checked the value of a session variable   If the variable is false  I want the application to redirect to the login page   I would prefer to redirect using the route name SystemLogin however any redirect method at this point would be fine

User · Answer

I am using MVC4  I used following approach to redirect a custom html screen upon authorization breach   Extend AuthorizeAttribute say CutomAuthorizer override the OnAuthorization and HandleUnauthorizedRequest  Register the CustomAuthorizer in the RegisterGlobalFilters   public static void RegisterGlobalFilters GlobalFilterCollection filters         filters Add new CustomAuthorizer         upon identifying the unAuthorized access call HandleUnauthorizedRequestand redirect to the concerned controller action as shown below     public class CustomAuthorizer   AuthorizeAttribute        public override void OnAuthorization AuthorizationContext filterContext                bool isAuthorized   IsAuthorized filterContext      check authorization         base OnAuthorization filterContext           if   isAuthorized  amp  amp   filterContext ActionDescriptor ActionName Equals  Unauthorized   StringComparison InvariantCultureIgnoreCase               amp  amp   filterContext ActionDescriptor ControllerDescriptor ControllerName Equals  LogOn   StringComparison InvariantCultureIgnoreCase                          HandleUnauthorizedRequest filterContext                         protected override void HandleUnauthorizedRequest AuthorizationContext filterContext                filterContext Result          new RedirectToRouteResult             new RouteValueDictionary    controller    LogOn                                                  action    Unauthorized

User · Answer

Set filterContext Result  With the route name   filterContext Result   new RedirectToRouteResult  SystemLogin   routeValues     You can also do something like   filterContext Result   new ViewResult       ViewName   SharedViews SessionLost      ViewData   filterContext Controller ViewData        If you want to use RedirectToAction   You could make a public RedirectToAction method on your controller  preferably on its base controller  that simply calls the protected RedirectToAction from System Web Mvc Controller   Adding this method allows for a public call to your RedirectToAction from the filter   public new RedirectToRouteResult RedirectToAction string action  string controller        return base RedirectToAction action  controller       Then your filter would look something like   public override void OnActionExecuting ActionExecutingContext filterContext        var controller    SomeControllerBase  filterContext Controller      filterContext Result   controller RedirectToAction  index    home

User · Answer

It sounds like you want to re-implement  or possibly extend  AuthorizeAttribute  If so  you should make sure that you inherit that  and not ActionFilterAttribute  in order to let ASP NET MVC do more of the work for you   Also  you want to make sure that you authorize before you do any of the real work in the action method - otherwise  the only difference between logged in and not will be what page you see when the work is done   public class CustomAuthorizeAttribute   AuthorizeAttribute       public override void OnAuthorization AuthorizationContext filterContext                   Do whatever checking you need here             If you want the base check as well  against users roles  call         base OnAuthorization filterContext             There is a good question with an answer with more details here on SO

User · Answer

Try the following snippet  it should be pretty clear   public class AuthorizeActionFilterAttribute   ActionFilterAttribute     public override void OnActionExecuting FilterExecutingContext filterContext          HttpSessionStateBase session   filterContext HttpContext Session      Controller controller   filterContext Controller as Controller       if  controller    null              if  session  Login      null                  filterContext Cancel   true          controller HttpContext Response Redirect    Login                       base OnActionExecuting filterContext

User · Answer

you could inherit your controller then use it inside your action filter   inside your ActionFilterAttribute class       if  filterContext Controller is MyController         if filterContext HttpContext Session  login      null              filterContext Controller as MyController  RedirectToAction  Login      inside your base controller    public class MyController   Controller        public void  RedirectToAction string actionName             base RedirectToAction actionName              Cons  of this is to change all controllers to inherit from  MyController  class

User · Answer

This works for me  asp net core 2 1   using JustRide Web Controllers  using Microsoft AspNetCore Mvc  using Microsoft AspNetCore Mvc Filters   namespace MyProject Web Filters       public class IsAuthenticatedAttribute   ActionFilterAttribute               public override void OnActionExecuting ActionExecutingContext context                        if  context HttpContext User Identity IsAuthenticated                  context Result   new RedirectToActionResult nameof AccountController Index    Account   null                         AllowAnonymous  IsAuthenticated  public IActionResult Index         return View

User · Answer

Alternatively to a redirect  if it is calling your own code  you could use this   actionContext Result   new RedirectToRouteResult      new RouteValueDictionary new   controller    Home   action    Error         actionContext Result ExecuteResult actionContext Controller ControllerContext     It is not a pure redirect but gives a similar result without unnecessary overhead

User · Answer

Here is a solution that also takes in account if you are using Ajax requests    using System  using System Web Mvc  using System Web Routing   namespace YourNamespace               AttributeUsage AttributeTargets Class   AttributeTargets Method  Inherited   true  AllowMultiple   true       public class AuthorizeCustom   ActionFilterAttribute           public override void OnActionExecuting ActionExecutingContext context                if  YourAuthorizationCheckGoesHere                                   string area         leave empty if not using area s                 string controller    ControllerName                   string action    ActionName                   var urlHelper   new UrlHelper context RequestContext                                     if  context HttpContext Request IsAjaxRequest        Check if Ajax                     if area    string Empty                          context HttpContext Response Write    lt script gt window location reload   urlHelper Content System IO Path Combine controller  action       lt  script gt                         else                         context HttpContext Response Write    lt script gt window location reload   urlHelper Content System IO Path Combine area  controller  action       lt  script gt                       else      Non Ajax Request                                           context Result   new RedirectToRouteResult new RouteValueDictionary  new  area  controller  action                                             base OnActionExecuting context

[c#] Redirect From Action Filter Attribute

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