How do I redirect the user to a view once they've logged in and attempted to go back to the login screen ASP NET CORE

Question

I have my auth controller which on successful login redirects the user to my dashboard controller with the user.identity properties populated, so I can use User.IsAuthenticated and User.IsInRole("Admin")

My question is.

Once the user is logged in and are on the dashboard page. How can I redirect them back to the dashboard page if they're already logged in.

Thanks in advance.

On page load you can check if user is already authenticated. If yes then redirect to dashboard page immediately. If no then process login and then redirect. — Roman, Apr 12 '19 at 13:11
@RomanDoskoch can you provide this as an answer? Some code would be cool. i think I've already got the solution but to get it as an answer would get you the votes++ and help the community if they come across this problem. Cheers. — cwiggo, Apr 12 '19 at 13:13

score 3 · Accepted Answer · answered Apr 12 '19 at 13:19

So my solution was to simply check if the user was already authenticated in my [HttpGet] login controller as opposed to my [HttpPost] login controller.

[HttpGet]
public ActionResult Login()
{
    if (User.Identity.IsAuthenticated)
        return RedirectToAction("Index", "Dashboard");

    return View();
}

[HttpPost]
public async Task<IActionResult> Login(LoginViewModel req)
{

    return View(req);
}

score 0 · Answer 2 · answered Apr 12 '19 at 13:59

Implement Authentication. And make Dashboard default controller. Magic will happen, out of the box.

In Startup.cs

public void ConfigureServices(IServiceCollection services)
{

...

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
         .AddCookie("user_by_cookie", options =>
         {
             options.LoginPath = "/Login/Index/";
         })
...


}



public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
...
 app.UseAuthentication();

 app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Dashboard}/{action=Index}/{id?}");
 });
...
}

Login Controller

    [Authorize(AuthenticationSchemes = "user_by_cookie")]
public class LoginController : Controller
{

    [HttpGet]
    [AllowAnonymous]
    public IActionResult Index()
    {
        return View();
    }

    [HttpPost]
    [AllowAnonymous]
    public IActionResult Index()
    {
        ...
        //authenticate();
        ...
        return View();
    }

    [HttpGet]
    public IActionResult Logout()
    {
        ..
        // logout();  -> 
        ..
        return RedirectToAction("Index");
    }

}

in Dashboard Controller

    [Authorize(AuthenticationSchemes = "user_by_cookie")]
public class DashboardController : Controller
{

    [HttpGet]
    public IActionResult Index()
    {
        return View();
    }

}

How do I redirect the user to a view once they've logged in and attempted to go back to the login screen ASP NET CORE

2 Answers2