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Often you'll want to require the user to log in before they can access
certain parts of your application. For example, it makes sense to show
the home page to everyone (whether you're logged in or not), but only
show your to-do list after you've logged in.
You can use the [Authorize] attribute in ASP.NET Core to require a
logged-in user for a particular action, or an entire controller. To require
authentication for all actions of the TodoController , add the attribute
above the first line of the controller:
Controllers/TodoController.cs
[Authorize]
public class TodoController : Controller
{
// ...
}
Add this using statement at the top of the file:
using Microsoft.AspNetCore.Authorization;
Try running the application and accessing /todo without being logged
in. You'll be redirected to the login page automatically.
The [Authorize] attribute is actually doing an authentication
check here, not an authorization check (despite the name of the
attribute). Later, you'll use the attribute to check both
authentication and authorization.
77
Require authentication
78
Using identity in the application
Using identity in the application
The to-do list items themselves are still shared between all users,
because the stored to-do entities aren't tied to a particular user. Now
that the [Authorize] attribute ensures that you must be logged in to
see the to-do view, you can filter the database query based on who is
logged in.
First, inject a UserManager<ApplicationUser> into the TodoController :
Controllers/TodoController.cs
[Authorize]
public class TodoController : Controller
{
private readonly ITodoItemService _todoItemService;
private readonly UserManager<ApplicationUser> _userManager;
public TodoController(ITodoItemService todoItemService,
UserManager<ApplicationUser> userManager)
{
_todoItemService = todoItemService;
_userManager = userManager;
}
// ...
}
You'll need to add a new using statement at the top:
using Microsoft.AspNetCore.Identity;
The UserManager class is part of ASP.NET Core Identity. You can use it