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see a list of all users registered for the application.
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As an extra challenge, try adding more administration features to
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this page. For example, you could add a button that gives an
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administrator the ability to delete a user account.
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Check for authorization in a view
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93
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Authorization with roles
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The [Authorize] attribute makes it easy to perform an authorization
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check in a controller or action method, but what if you need to check
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authorization in a view? For example, it would be nice to display a
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"Manage users" link in the navigation bar if the logged-in user is an
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administrator.
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You can inject the UserManager directly into a view to do these types of
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authorization checks. To keep your views clean and organized, create a
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new partial view that will add an item to the navbar in the layout:
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Views/Shared/_AdminActionsPartial.cshtml
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@using Microsoft.AspNetCore.Identity
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@using AspNetCoreTodo.Models
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@inject SignInManager<ApplicationUser> signInManager
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@inject UserManager<ApplicationUser> userManager
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@if (signInManager.IsSignedIn(User))
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{
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var currentUser = await UserManager.GetUserAsync(User);
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var isAdmin = currentUser != null
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&& await userManager.IsInRoleAsync(
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currentUser,
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Constants.AdministratorRole);
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if (isAdmin)
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{
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<ul class="nav navbar-nav navbar-right">
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<li>
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<a asp-controller="ManageUsers"
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asp-action="Index">
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Manage Users
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</a>
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</li>
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</ul>
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}
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}
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94
|
Authorization with roles
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It's conventional to name shared partial views starting with an _
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underscore, but it's not required.
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This partial view first uses the SignInManager to quickly determine
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whether the user is logged in. If they aren't, the rest of the view code can
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be skipped. If there is a logged-in user, the UserManager is used to look
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up their details and perform an authorization check with
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IsInRoleAsync() . If all checks succeed and the user is an adminstrator, a
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Manage users link is added to the navbar.
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To include this partial in the main layout, edit _Layout.cshtml and add it
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