TagHelperSamples

Authorize Tag Helper

The Authorize tag helper allows you render blocks of HTML only for users who are authorized based on ASP.NET Core Authorization Roles and Policies. For example, a section of HTML might be rendered only if a user has the Admin role. Since everything is evaluated on the server, this tag helper provides an easy way to ensure that users only see the HTML sections they are supposed to see.

The Authorize tag helper works in the same way as the Authorize filter works for controllers and action Methods. The examples below show some common use cases.

Login Testing

Use this section to login using different username, roles and age to see how the Authorize Tag Helper can be used to hide sections of HTML.

Authorize

Razor Code:

<div asp-authorize class="col-md-4">
    <div class="panel panel-default">
        <div class="panel-heading">Welcome !!</div>
        <div class="panel-body">
            If you're logged in, you can see this section
        </div>
    </div>
</div>
<div asp-authorize asp-roles="Admin" class="col-md-4">
    <div class="panel panel-default">
        <div class="panel-heading">Admin Section</div>
        <div class="panel-body">
            Only admin users can see this section. Top secret admin things go here.
        </div>
    </div>
</div>
<div asp-authorize asp-policy="Seniors" class="col-md-4">
    <div class="panel panel-default">
        <div class="panel-heading">Seniors Only</div>
        <div class="panel-body">
            Only users age 65 or older can see this section. Early bird dinner coupons go here. The app has a policy named Seniors which requires a claim of type <i>Age</i> with a value greater than or equal to <i>65</i>.
        </div>
    </div>
</div>
<div asp-authorize asp-roles="Admin" asp-policy="Seniors" class="col-md-4">
    <div class="panel panel-default">
        <div class="panel-heading">Admin Seniors Only</div>
        <div class="panel-body">
            Only users who have both the Admin role AND are age 65 or older can see this section.
        </div>
    </div>
</div>

Authorize Resource

Resource based authorization allows you to evaluate policies/requirements for the current user against a particular resource. You can read more about resource authorization here.

The following examples shows the two uses for the Authorize Resource tag helper. First, we evaluate the EditDocument policy for the Edit link. Next, we evalute the Operations.Delete requirement for the Delete link.

Title Author Edit Delete
New Study of Obesity Looks for Larger Test Group Joe
Hospitals are Sued by 7 Foot Doctors Joe
Child Wins Gun from Fundraiser James
Something Went Wrong in Jet Crash, Expert Says James
Enraged Cow Injures Farmer with Ax Jane
Threat Disrupts Plans to Meet About Threats Jane
Utah Poison Control Center Asks People to not Consume Poison Jane
Attourney Accidentally Sues Himself Joe
Hospitals are Sued by 7 Foot Doctors Jim
Something Went Wrong in Jet Crash, Expert Says Joe
Most Earthquake Damage Found to be Caused by Shaking James
Threat Disrupts Plans to Meet About Threats Jim
British Left Waffles on Falkland Islands James
Teacher Strikes Idle Kids Joe
Cold Wave Linked to Temperatures James

Razor Code:

<table class="table table-striped">
    <thead>
        <tr>
            <th>Title</th>
            <th>Author</th>
            <th>Edit</th>
            <th>Delete</th>
        </tr>
    </thead>
    <tbody>
       @foreach (Document document in ViewBag.Documents)
        {
            <tr>
            <td>@document.Title</td>
            <td>@document.Author</td>
            <td><a href="#" asp-authorize-resource="document" 
            asp-policy="EditDocument" class="glyphicon glyphicon-pencil"></a>
            </td>
            <td><a href="#" asp-authorize-resource="document"
            asp-requirement="Operations.Delete" class="glyphicon glyphicon-trash text-danger">                            
            </a></td>
            </tr>
        }
    </tbody>
</table>