How to redirect user if he is not logged in .NET Core?

Question

I am working on a web application made in .NET Core with Razor Pages.

I'd like to redirect the user if they are not logged in to the login page. If they log in - the system should redirect the user to it's first requested link/original link.

This is my current Configure -method:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider provider)
{

    ...

     app.Use(async (ctx, next) =>
     {
        await next();
        if(ctx.Response.StatusCode == 404 && !ctx.Response.HasStarted)
          {
              //Re-execute the request so the user gets the error page
              string originalPath = ctx.Request.Path.Value;
              ctx.Items["originalPath"] = originalPath;
              ctx.Request.Path = "/error";
              await next();
          }
     });
     app.UseStaticFiles();

     app.UseAuthentication();

     app.UseMvc();

}

So if a users requests /Dashboard/Settings/Account/Password for example and he is not logged in, I'd like to redirect him to the Login page first, and after he submits he will be redirected to that link instead of /Dashboard.

I am not sure how I can adapt this script ( source )

edit

// In my login
if (result.Succeeded)
{
 _logger.LogInformation("User logged in.");

  if(!string.IsNullOrEmpty(returnUrl))
    return Redirect(returnUrl);

  return RedirectToPage("/Dashboard/Index");
}

I think the problem lies here. My ReturnUrl is null . So it always redirects to the homepage.

Answer 1

What I did for cookie authentication

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
        .AddCookie(options => {
            options.LoginPath = "/Home/Login/"; // auth redirect
            options.ExpireTimeSpan = new TimeSpan(1,0,0,0 ); 
        });

    [Authorize] // set authorize will auto redirect to specified LoginPath
    public IActionResult yourmethod()