如何在ASP.NET酷睿2中配置Steam的OpenID连接？

<configuration>
  <configSections>
    <section name="dotNetOpenAuth" type="DotNetOpenAuth.Configuration.DotNetOpenAuthSection" requirePermission="false" allowLocation="true" />
  </configSections>
  <dotNetOpenAuth>
    <openid>
      <relyingParty>
        <behaviors>
          <add type="DotNetOpenAuth.OpenId.RelyingParty.Behaviors.AXFetchAsSregTransform, DotNetOpenAuth.OpenId.RelyingParty">
            <requiredFields>
              <add key="email" alias="http://axschema.org/contact/email" />
              <add key="fullname" alias="http://axschema.org/namePerson" />
              <add key="nickname" alias="http://axschema.org/namePerson/friendly" />
            </requiredFields>
          </add>
        </behaviors>
      </relyingParty>
      <providers>
        <clear />
        <add type="DotNetOpenAuth.OpenId.RelyingParty.OpenIdProviderEndpoint, DotNetOpenAuth.OpenId.RelyingParty" endpoint="https://steamcommunity.com/openid/login" />
      </providers>
    </openid>
  </dotNetOpenAuth>
</configuration>

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using DotNetOpenAuth.OpenId.RelyingParty;

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddAuthentication(options =>
        {
            options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
        })
        .AddCookie()
        .AddOpenIdConnect(options =>
        {
            options.ClientId = "YOUR_STEAM_APP_ID";
            options.ClientSecret = "YOUR_STEAM_APP_SECRET";
            options.Authority = "https://steamcommunity.com/openid";
            options.CallbackPath = "/signin-steam";
            options.SignedOutCallbackPath = "/signout-callback-steam";
            options.ResponseType = "id_token";
            options.SaveTokens = true;
            options.GetClaimsFromUserInfoEndpoint = true;
        });

        services.AddControllersWithViews();
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();

        app.UseAuthentication();
        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Mvc;

public class AccountController : Controller
{
    public IActionResult Login()
    {
        return Challenge(new AuthenticationProperties { RedirectUri = "/" }, "OpenIdConnect");
    }

    public IActionResult Logout()
    {
        return SignOut(new AuthenticationProperties { RedirectUri = "/" }, "Cookies", "OpenIdConnect");
    }
}