ASP.NET Core 5: Best way to use common URL for login page and root page - asp.net

Question

In an ASP.NET Core 5 web app with Identity (and in earlier versions), the URL for the login page defaults to:
https://[yourhost]/account/login
and once you're logged in, the root of your project lives at:
https://[yourhost]
But in many (most?) web apps, the login page shares the URL with the root page. Using Facebook as an exmaple, before I'm logged in, the URL is https://www.facebook.com, and after logging in the URL is the same. What's the best way to achieve this in ASP.NET Core?
The best solution I have so far is:
(AccountController.cs)
[HttpGet]
[AllowAnonymous]
[Route("/")]
public async Task<IActionResult> Login(string returnUrl = null)
{
// If authenticated, serve the application page.
if (User.Identity.IsAuthenticated)
{
return View("~/Views/Weather/Index.cshtml");
}
// Otherwise, serve the login page.
else
{
ViewData["ReturnUrl"] = returnUrl;
return View();
}
}
This doesn't feel great because , from AccountController, I'm returning a view that should correspond to WeatherController.
Ideally, I'd like to say, "for URL '/' , only if the user is logged in, match this endpoint in the weather controller. Else, fall back to this other endpoint in the account controller." I was thinking this might be possible with a custom route constraint, but I'm not necessarily passing any parameters to the URL. I was also looking into DynamicRouteValueTransformer, but wasn't successful.
Or, is it misguided for me to try to have the login page share a URL with the root page? Thanks for any suggestions.

Answer 1

Change Default Settings of Identity Framework,
services.ConfigureApplicationCookie(options =>
{
// Cookie settings
options.Cookie.HttpOnly = true;
options.ExpireTimeSpan = TimeSpan.FromMinutes(5);
options.LoginPath = "/Home/Index/; // here
options.AccessDeniedPath = "/Identity/Account/AccessDenied";
options.SlidingExpiration = true;
});
after that check, if the user is authenticated return a different view, and if the user is not authenticated return a different view that user can login.