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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;
namespace System.Web.Http
{
public class ExceptionController : ApiController
{
public static string ResponseExceptionHeaderKey = "responseExceptionStatusCode";
public HttpResponseMessage Unavailable()
{
throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.ServiceUnavailable));
}
public Task<HttpResponseMessage> AsyncUnavailable()
{
throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.ServiceUnavailable));
}
public Task<HttpResponseMessage> AsyncUnavailableDelegate()
{
return Task.Factory.StartNew<HttpResponseMessage>(() => { throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.ServiceUnavailable)); });
}
public HttpResponseMessage ArgumentNull()
{
throw new ArgumentNullException("foo");
}
public Task<HttpResponseMessage> AsyncArgumentNull()
{
return Task.Factory.StartNew<HttpResponseMessage>(() => { throw new ArgumentNullException("foo"); });
}
[HttpGet]
public string GetException()
{
return "foo";
}
[HttpGet]
public string GetString()
{
return "bar";
}
public T GenericAction<T>() where T : User
{
return null;
}
[AuthorizationFilterThrows]
public void AuthorizationFilter() { }
[ActionFilterThrows]
public void ActionFilter() { }
[ExceptionFilterThrows]
public void ExceptionFilter() { throw new ArgumentException("exception"); }
private class AuthorizationFilterThrows : AuthorizeAttribute
{
public override void OnAuthorization(HttpActionContext actionContext)
{
TryThrowHttpResponseException(actionContext);
throw new ArgumentException("authorization");
}
}
private class ActionFilterThrows : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext actionContext)
{
TryThrowHttpResponseException(actionContext);
throw new ArgumentException("action");
}
}
private class ExceptionFilterThrows : ExceptionFilterAttribute
{
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
TryThrowHttpResponseException(actionExecutedContext.ActionContext);
throw actionExecutedContext.Exception;
}
}
private static void TryThrowHttpResponseException(HttpActionContext actionContext)
{
IEnumerable<string> values;
if (actionContext.ControllerContext.Request.Headers.TryGetValues(ResponseExceptionHeaderKey, out values))
{
string statusString = values.First() as string;
if (!String.IsNullOrEmpty(statusString))
{
HttpStatusCode status = (HttpStatusCode)Enum.Parse(typeof(HttpStatusCode), statusString);
throw new HttpResponseException(actionContext.Request.CreateResponse(status, "HttpResponseExceptionMessage"));
}
}
}
}
}
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