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ActionFilterAttribute.cs
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ActionFilterAttribute.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System.Diagnostics.CodeAnalysis;
using System.Net.Http;
using System.Runtime.ExceptionServices;
using System.Threading;
using System.Threading.Tasks;
using System.Web.Http.Controllers;
using System.Web.Http.Properties;
namespace System.Web.Http.Filters
{
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
public abstract class ActionFilterAttribute : FilterAttribute, IActionFilter
{
public virtual void OnActionExecuting(HttpActionContext actionContext)
{
}
public virtual void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "exception is flowed through the task")]
public virtual Task OnActionExecutingAsync(HttpActionContext actionContext, CancellationToken cancellationToken)
{
try
{
OnActionExecuting(actionContext);
}
catch (Exception ex)
{
return TaskHelpers.FromError(ex);
}
return TaskHelpers.Completed();
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "exception is flowed through the task")]
public virtual Task OnActionExecutedAsync(HttpActionExecutedContext actionExecutedContext, CancellationToken cancellationToken)
{
try
{
OnActionExecuted(actionExecutedContext);
}
catch (Exception ex)
{
return TaskHelpers.FromError(ex);
}
return TaskHelpers.Completed();
}
Task<HttpResponseMessage> IActionFilter.ExecuteActionFilterAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task<HttpResponseMessage>> continuation)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
if (continuation == null)
{
throw Error.ArgumentNull("continuation");
}
return ExecuteActionFilterAsyncCore(actionContext, cancellationToken, continuation);
}
[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "We want to intercept all exceptions")]
private async Task<HttpResponseMessage> ExecuteActionFilterAsyncCore(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task<HttpResponseMessage>> continuation)
{
await OnActionExecutingAsync(actionContext, cancellationToken);
if (actionContext.Response != null)
{
return actionContext.Response;
}
return await CallOnActionExecutedAsync(actionContext, cancellationToken, continuation);
}
[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "We want to intercept all exceptions")]
private async Task<HttpResponseMessage> CallOnActionExecutedAsync(HttpActionContext actionContext, CancellationToken cancellationToken, Func<Task<HttpResponseMessage>> continuation)
{
cancellationToken.ThrowIfCancellationRequested();
HttpResponseMessage response = null;
ExceptionDispatchInfo exceptionInfo = null;
try
{
response = await continuation();
}
catch (Exception e)
{
exceptionInfo = ExceptionDispatchInfo.Capture(e);
}
Exception exception;
if (exceptionInfo == null)
{
exception = null;
}
else
{
exception = exceptionInfo.SourceException;
}
HttpActionExecutedContext executedContext = new HttpActionExecutedContext(actionContext, exception)
{
Response = response
};
try
{
await OnActionExecutedAsync(executedContext, cancellationToken);
}
catch
{
// Catch is running because OnActionExecuted threw an exception, so we just want to re-throw.
// We also need to reset the response to forget about it since a filter threw an exception.
actionContext.Response = null;
throw;
}
if (executedContext.Response != null)
{
return executedContext.Response;
}
Exception newException = executedContext.Exception;
if (newException != null)
{
if (newException == exception)
{
exceptionInfo.Throw();
}
else
{
throw newException;
}
}
throw Error.InvalidOperation(SRResources.ActionFilterAttribute_MustSupplyResponseOrException, GetType().Name);
}
}
}