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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
namespace Microsoft.AspNetCore.Authentication
{
public class AuthenticationMiddleware
{
private readonly RequestDelegate _next;
public AuthenticationMiddleware(RequestDelegate next, IAuthenticationSchemeProvider schemes)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (schemes == null)
{
throw new ArgumentNullException(nameof(schemes));
}
_next = next;
Schemes = schemes;
}
public IAuthenticationSchemeProvider Schemes { get; set; }
public async Task Invoke(HttpContext context)
{
context.Features.Set<IAuthenticationFeature>(new AuthenticationFeature
{
OriginalPath = context.Request.Path,
OriginalPathBase = context.Request.PathBase
});
// Give any IAuthenticationRequestHandler schemes a chance to handle the request
var handlers = context.RequestServices.GetRequiredService<IAuthenticationHandlerProvider>();
foreach (var scheme in await Schemes.GetRequestHandlerSchemesAsync())
{
var handler = await handlers.GetHandlerAsync(context, scheme.Name) as IAuthenticationRequestHandler;
if (handler != null && await handler.HandleRequestAsync())
{
return;
}
}
var defaultAuthenticate = await Schemes.GetDefaultAuthenticateSchemeAsync();
if (defaultAuthenticate != null)
{
var result = await context.AuthenticateAsync(defaultAuthenticate.Name);
if (result?.Principal != null)
{
context.User = result.Principal;
}
}
await _next(context);
}
}
}
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