How do you set the user corresponding to AuthorizeAttribute in .net?

2 years ago
Isabella Edwards
2 minutes

In ASP.NET, users can be authorized by using the AuthorizeAttribute.

Firstly, it is necessary to use the AuthorizeAttribute on the controller’s methods or the entire controller class to restrict access only to authorized users. For example:

[Authorize]
public class HomeController : Controller
{
    // ...
}

The above code indicates that only authorized users can access the HomeController controller.

Then, you can use the User property to access information about the currently authenticated user. For example, in a controller’s method, you can use User.Identity.Name to get the current user’s username, or use User.IsInRole(“roleName”) to check if a user belongs to a specific role.

public class HomeController : Controller
{
    public IActionResult Index()
    {
        string username = User.Identity.Name;
        bool isAdmin = User.IsInRole("Admin");

        // ...

        return View();
    }
}

In the above code, User.Identity.Name retrieves the current user’s username, while User.IsInRole(“Admin”) checks if the current user belongs to the Admin role.

It’s important to note that in order to use the User property, you need to ensure that authentication and authorization have been implemented. This can be done by configuring relevant settings in the ConfigureServices method of the Startup.cs file, such as adding authentication services and authorization policies.

public void ConfigureServices(IServiceCollection services)
{
    // ...

    services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
        .AddCookie(options =>
        {
            options.LoginPath = "/Account/Login";
            options.AccessDeniedPath = "/Account/AccessDenied";
        });

    services.AddAuthorization(options =>
    {
        options.AddPolicy("RequireAdminRole", policy =>
            policy.RequireRole("Admin"));
    });

    // ...
}

In the above code, services.AddAuthentication is used to add authentication services, while services.AddAuthorization is used to add authorization policies. This allows the User property to be used in the controller to retrieve user information.

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