.NET跨平台之OWEN中 过滤器的使用

.NET中依赖IIS，通俗的说就是依赖IIS的程序集，导致我们的.NET项目就算是MONO到TOMCAT上，也无法使用，所以OWEN横空出世，OWEN定义了一套接口，接口定义了做.NET项目要实现的一些接口，OWEN本身通过这些接口获取到我们项目中的Request/Response，拿着这些去和Server(IIS\APCHE\TOMCAT...)通信.

回到正题，我们知道在MVC中，可以有

public override void OnActionExecuted(ActionExecutedContext filterContext)

public override void OnAuthorization(AuthorizationContext filterContext)

...

OWEN中就是

namespace Owin
{
    /// <summary>
    /// An ordered list of known Asp.Net integrated pipeline stages. More details on the ASP.NET integrated pipeline can be found at http://msdn.microsoft.com/en-us/library/system.web.httpapplication.aspx
    /// </summary>
    public enum PipelineStage
    {
        /// <summary>
        /// Corresponds to the AuthenticateRequest stage of the ASP.NET integrated pipeline.
        /// </summary>
        Authenticate,

        /// <summary>
        /// Corresponds to the PostAuthenticateRequest stage of the ASP.NET integrated pipeline.
        /// </summary>
        PostAuthenticate,

        /// <summary>
        /// Corresponds to the AuthorizeRequest stage of the ASP.NET integrated pipeline.
        /// </summary>
        Authorize,

        /// <summary>
        /// Corresponds to the PostAuthorizeRequest stage of the ASP.NET integrated pipeline.
        /// </summary>
        PostAuthorize,

        /// <summary>
        /// Corresponds to the ResolveRequestCache stage of the ASP.NET integrated pipeline.
        /// </summary>
        ResolveCache,

        /// <summary>
        /// Corresponds to the PostResolveRequestCache stage of the ASP.NET integrated pipeline.
        /// </summary>
        PostResolveCache,

        /// <summary>
        /// Corresponds to the MapRequestHandler stage of the ASP.NET integrated pipeline.
        /// </summary>
        MapHandler,

        /// <summary>
        /// Corresponds to the PostMapRequestHandler stage of the ASP.NET integrated pipeline.
        /// </summary>
        PostMapHandler,

        /// <summary>
        /// Corresponds to the AcquireRequestState stage of the ASP.NET integrated pipeline.
        /// </summary>
        AcquireState,

        /// <summary>
        /// Corresponds to the PostAcquireRequestState stage of the ASP.NET integrated pipeline.
        /// </summary>
        PostAcquireState,

        /// <summary>
        /// Corresponds to the PreRequestHandlerExecute stage of the ASP.NET integrated pipeline.
        /// </summary>
        PreHandlerExecute,
    }
}

差不多够用了。

代码会这么写：

首先要确定拦截到这个过滤器之后，要干啥

app.Use(typeof(OAuthBearerAuthenticationMiddleware), app, options);

OAuthBearerAuthenticationMiddleware是时间了OWEN接口的自定义中间件，授权用

然后定义中间件在哪个过滤器注入

object obj;

if (app.Properties.TryGetValue("integratedpipeline.StageMarker", out obj))
{
var addMarker = (Action<IAppBuilder, string>)obj;
addMarker(app, PipelineStage.Authenticate.ToString());
}