Authentication With ASP.NET Core Identity

Authentication With ASP.NET Core Identity、

Preparing the Authentication Environment in our Project

The first thing, we are going to do is disable unauthorized users to access the Employees action. To do that, we have to add the [Authorize] attribute on top of that action:

[Authorize]
public async Task<IActionResult> Employees()
{
    var employees = await _context.Employees.ToListAsync();
    return View(employees);
}

Additionally, we have to add authentication middleware to the ASP.NET Core’s pipeline right above the app.UseAuthorization() expression:

app.UseAuthentication();

If we run our application now and click on the Employees link, we are going to get a 404 not found response:

 

We get this because, by default, ASP.NET Core Identity tries to redirect an unauthorized user to the /Account/Login action, which doesn’t exist at the moment. Additionally, you can see a ReturnUrl query string that provides a path to the required action before the user was redirected to the Login page. We are going to deal with it later in this post.

 

Now, we are going to do a couple of things to fix this 404 error.

 

自己控制登录

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Login(UserLoginModel userModel)
{
    if(!ModelState.IsValid)
    {
        return View(userModel);
    }

    var user = await _userManager.FindByEmailAsync(userModel.Email);
    if(user != null && 
        await _userManager.CheckPasswordAsync(user, userModel.Password))
    {
        var identity = new ClaimsIdentity(IdentityConstants.ApplicationScheme);
        identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, user.Id));
        identity.AddClaim(new Claim(ClaimTypes.Name, user.UserName));

        await HttpContext.SignInAsync(IdentityConstants.ApplicationScheme,
            new ClaimsPrincipal(identity));

        return RedirectToAction(nameof(HomeController.Index), "Home");
    }
    else
    {
        ModelState.AddModelError("", "Invalid UserName or Password");
        return View();
    }
}

登录成功之后，cookie list里面有.AspNetCore.Identity.Application这个cookie

 

 

Automating Authentication Process

If you want to take complete control over the authentication logic, the approach we have used is a great choice. But, we can speed up the process by using the SignInManger<TUser> class. This class provides the API for user sign in with a lot of helper methods.

 

 

Conclusion

So, to sum it up, we have learned:

• How to execute the authentication process
• How to use different UserManager helper methods that help in a process
• The way to implement ReturnUrl logic
• And how to add additional claims to the user

In the next article, we are going to talk about Reset Password (Forgot Password) functionality with ASP.NET Core Identity.