OAuthAuthorizationServerProvider.OnGrantRefreshToken 不适用于 OAuth2 身份验证提供程序

Question

我正在使用 OWIN 中间件在 .Net Framework 4.7.2 中生成 JWT 令牌，并创建了一个 Startup.cs 文件，其中有 ConfigureAuth() 函数。这在应用程序启动时被调用以创建 OAuthAuthorizationServerProvider 的实例，并为 OnValidateClientAuthentication、OnGrantResourceOwnerCredentials 和 OnGrantRefreshToken 注册事件处理程序。

我可以使用 grant_type = "password" 以及所需的凭据调用在提供程序中重新生成的 TokenEndpointPath - /oauth2/token 并生成 JWT 令牌。但即使当我使用 grant_type = "refresh_token" 调用 /oauth2/token 端点时，调用也总是落在 OnValidateClientAuthentication 并且失败。 OnGrantRefreshToken 事件永远不会被触发。这是我的代码 -

public partial class Startup
{       
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = GlobalConfiguration.Configuration ?? new HttpConfiguration();
        StandardKernel kern = CreateKernel();

        ConfigureAuth(app, config, kern);

        GlobalConfiguration.Configure(WebApiConfig.Register);
        
        app.UseCors(CorsOptions.AllowAll);
        app.UseNinjectMiddleware(() => kern);
        app.UseNinjectWebApi(config);
    }


    protected static StandardKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        kernel.Load(Assembly.GetExecutingAssembly());

        IHttpContextProvider contextProvider = new HttpContextProvider();
        ITracePersister<WebApiLogEntry> webpersister = new WebApiPersister();
        SavanaWebApiSystemWebTraceWriter<WebApiLogEntry> _webTraceWriter = new SavanaWebApiSystemWebTraceWriter<WebApiLogEntry>(contextProvider, webpersister);

        kernel.Bind<System.Web.Http.Tracing.ITraceWriter>().ToMethod((Ninject.Activation.IContext context) =>
        {
            System.Web.Http.Tracing.ITraceWriter traceWriter = _webTraceWriter;
            return traceWriter;
        });

        kernel.Bind<IOAuthAuthentication>().To<OAuthAuthentication>();
        kernel.Bind<ISecureDataFormat<AuthenticationTicket>>().To<nGageJwtFormat>();
        kernel.Bind<ITenantProvider>().ToConstant(TenantProviderFactory.CurrentProvider);
        kernel.Bind<IAuthenticationTokenProvider>().To<RefreshTokenProvider>();

        return kernel;
    }

    public void ConfigureAuth(IAppBuilder app, HttpConfiguration config, StandardKernel kernel)
    {
        var oauthProvider = new OAuthAuthorizationServerProvider
        {
            OnGrantRefreshToken = async context =>
            {
                await Task.Run(() =>
                {
                    IOAuthAuthentication authProvider = (IOAuthAuthentication)
                        config.DependencyResolver.GetService(typeof(IOAuthAuthentication));

                    authProvider.ValidateRefreshToken(context);


                });
            },
            OnGrantResourceOwnerCredentials = async context =>
            {
                await Task.Run(() =>
                {
                    IOAuthAuthentication authProvider = (IOAuthAuthentication)
                        config.DependencyResolver.GetService(typeof(IOAuthAuthentication));

                    authProvider.ValidateResourceOwner(context);
                    
                });
            },
            OnValidateClientAuthentication = async context =>
            {
                await Task.Run(() =>
                {
                    IOAuthAuthentication authProvider = (IOAuthAuthentication)
                        config.DependencyResolver.GetService(typeof(IOAuthAuthentication));

                    authProvider.ValidateClient(context);
                });
            }
        };

        ISecureDataFormat<AuthenticationTicket> jwtFormatter = kernel.Get<ISecureDataFormat<AuthenticationTicket>>();

        IAuthenticationTokenProvider refreshTokenProvider = kernel.Get<IAuthenticationTokenProvider>();

        var oauthOptions = new OAuthAuthorizationServerOptions
        {              
            TokenEndpointPath = new PathString("/oauth2/token"),
            Provider = oauthProvider,
            SystemClock = new SystemClock(),
            AccessTokenFormat = jwtFormatter,
            RefreshTokenProvider = refreshTokenProvider
        };

        app.UseOAuthAuthorizationServer(oauthOptions);
        app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
    }
}

我在这里错过了什么？我尝试在线搜索，但找不到与使用 OnGrantRefreshToken 相关的任何内容。提前致谢！