asp.net-mvc – 在.Net MVC WS-Federation站点中阻止XmlHttpRequ

我在MVC 3站点上使用WS Federated(Claims Aware)身份验证,但在身份验证失败时,保留一些发送 JSON的API控制器无法返回重定向.我有一个名为API的区域,它有几个只返回JSON的控制器,这些控制器都从相同的基类继承.我想发送合法的401错误响应,而不是默认情况下发生的302重定向.

我按照我发现的一些指示创建了一个自定义的WSFederationAuthenticationModule,并与我在API控制器操作中放置的过滤器一起使用：

public class WSFederationServiceAuthenticationModule : WSFederationAuthenticationModule
{
    private static Log4NetLoggingService logger = new Log4NetLoggingService();

    public const string IsServiceIndicator = "ROIP.IsService";

    protected override void OnAuthorizationFailed(AuthorizationFailedEventArgs e)
    {
        base.OnAuthorizationFailed(e);            

        var isService = HttpContext.Current.Items[IsServiceIndicator];

        if (isService != null)
        {
            logger.Info("WSFedService: Found IsService");
            e.RedirectToIdentityProvider = false;
        }
        else
        {
            logger.Info("WSFedService: Did not find IsService");
        }
    }
}

public class WSFederationServiceAuthAttribute : ActionFilterAttribute
{
    private static Log4NetLoggingService logger = new Log4NetLoggingService();

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        base.OnActionExecuting(filterContext);

        // Set an item that indicates this is a service request,do not redirect.
        logger.Info("WSFedService: Setting IsService");
        HttpContext.Current.Items[WSFederationServiceAuthenticationModule.IsServiceIndicator] = 1;
    }
}

但是我的日志记录显示我从未在Items中找到IsService项：

{INFO}02/29 03:39:21 - WSFedService: Setting IsService
{INFO}02/29 03:39:32 - WSFedService: Setting IsService
{INFO}02/29 03:39:32 - WSFedService: Setting IsService
{INFO}02/29 03:50:39 - WSFedService: Did not find IsService
{INFO}02/29 03:53:16 - WSFedService: Did not find IsService
{INFO}02/29 03:53:29 - WSFedService: Did not find IsService

我认为这可能是HttpContext.Current在过滤器和模块之间不一样的问题,但我不确定.

我尝试的另一个选项是在Global.asax.cs的Application_Start事件中订阅FederatedAuthentication.WSFederationAuthenticationModule.RedirectingToIdentityProvider事件,但此时WSFederationAuthenticationModule为null.

private void ConfigureWSFederationAuthentication()
{
    bool hasFederatedAuthentication = false;
    try
    {
        if (FederatedAuthentication.WSFederationAuthenticationModule != null)
        {
            hasFederatedAuthentication = true;
        }
    }
    catch
    {
        hasFederatedAuthentication = false;
    }

    if (hasFederatedAuthentication)
    {
        Logger.Info("WSFederation: Registering for Event Handler");
        FederatedAuthentication.WSFederationAuthenticationModule.RedirectingToIdentityProvider += (s,e) =>
            {
                var msg = string.Empty;
                try
                {
                    if (HttpContext.Current.Request.Headers["X-Requested-With"] == "XMLHttpRequest")
                    {
                        e.Cancel = true;
                        msg = "Found XMLHttpRequest header";
                    }
                    else
                    {
                        msg = "Did not find XMLHttpRequest header";
                    }
                }
                catch (Exception ex)
                {
                    msg = "WSFederation: Event Handler Error: " + ex.Message;
                }

                Logger.Info("WSFederation: Redirecting from Event Handler: " + msg);
            };
    }
    else
    {
        Logger.Info("WSFederation: Null WSFederationAuthenticationModule");
    }
}

我想知道如何使第一个选项工作,或者我应该订阅RedirectingToIdentityProvider事件.

public class WSFederationServiceAuthenticationModule : WSFederationAuthenticationModule
{
    private static Log4NetLoggingService logger = new Log4NetLoggingService();

    protected override void OnAuthorizationFailed(AuthorizationFailedEventArgs e)
    {
        base.OnAuthorizationFailed(e);            

        var context = HttpContext.Current;
        var req = context.Request;
        var resp = context.Response;

        if (req == null || resp == null)
        {
            logger.Info("WSFedService: Did not find Request or Response");
            return;
        }

        if ((resp.StatusCode == 302 || resp.StatusCode == 401) && req.Headers["X-Requested-With"] == "XMLHttpRequest")
        {
            logger.Info("WSFedService: Found Redirect and Header");
            e.RedirectToIdentityProvider = false;
        }
        else
        {
            logger.Info(string.Format("WSFedService: Did not find redirect status code or XMLHttpRequest Header: {0}",resp.StatusCode));
        }

    }
}

<system.web>
    <httpModules>
        <!-- Old and Busted...
        <add name="WSFederationAuthenticationModule"
           type="Microsoft.IdentityModel.Web.WSFederationAuthenticationModule,Microsoft.IdentityModel,Version=3.5.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35" />
        -->

        <!-- New Hotness... -->
        <add name="WSFederationAuthenticationModule"
           type="MyApp.Web.Authentication.WSFederationServiceAuthenticationModule,MyApp.Web" />
    </httpModules>
</system.web>

<system.webServer>
    <modules>
        <!-- Old and Busted...
        <add name="WSFederationAuthenticationModule"
           type="Microsoft.IdentityModel.Web.WSFederationAuthenticationModule,PublicKeyToken=31bf3856ad364e35"
           preCondition="managedHandler"/>
        -->

        <!-- New Hotness... -->
        <add name="WSFederationAuthenticationModule"
           type="MyApp.Web.Authentication.WSFederationServiceAuthenticationModule,MyApp.Web"
           preCondition="managedHandler"/>

    </modules>
</system.webServer>