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DenyAnonymousAuthorizationRequirement.cs
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DenyAnonymousAuthorizationRequirement.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Linq;
using System.Threading.Tasks;
namespace Microsoft.AspNetCore.Authorization.Infrastructure;
/// <summary>
/// Implements an <see cref="IAuthorizationHandler"/> and <see cref="IAuthorizationRequirement"/> which requires the current user must be authenticated.
/// This calls <see cref="AuthorizationHandlerContext.Succeed(IAuthorizationRequirement)"/> for authenticated users. Like all built-in requirements,
/// it never calls <see cref="AuthorizationHandlerContext.Fail()"/>. The <see cref="DefaultAuthorizationEvaluator"/> produces a failed <see cref="AuthorizationResult" />
/// when any requirement has not succeeded even if other requirements have succeeded, and no requirement has explicitly failed.
/// </summary>
public class DenyAnonymousAuthorizationRequirement : AuthorizationHandler<DenyAnonymousAuthorizationRequirement>, IAuthorizationRequirement
{
/// <summary>
/// Makes a decision if authorization is allowed based on a specific requirement.
/// </summary>
/// <param name="context">The authorization context.</param>
/// <param name="requirement">The requirement to evaluate.</param>
protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, DenyAnonymousAuthorizationRequirement requirement)
{
var user = context.User;
var userIsAnonymous =
user?.Identity == null ||
!user.Identities.Any(i => i.IsAuthenticated);
if (!userIsAnonymous)
{
context.Succeed(requirement);
}
return Task.CompletedTask;
}
/// <inheritdoc />
public override string ToString()
{
return $"{nameof(DenyAnonymousAuthorizationRequirement)}: Requires an authenticated user.";
}
}