private static void Rethrow(ActionExecutedContextEx context)
{
if (context == null)
{
return;
}
if (context.ExceptionHandled)
{
return;
}
if (context.ExceptionDispatchInfo != null)
{
context.ExceptionDispatchInfo.Throw();
}
if (context.Exception != null)
{
throw context.Exception;
}
}
private async Task InvokeNextActionFilterAsync()
{
try
{
var next = State.ActionNext;
var state = (object)null;
var scope = Scope.Action;
var isCompleted = false;
while (!isCompleted)
{
await Next(ref next, ref scope, ref state, ref isCompleted);
}
}
catch (Exception exception)
{
_actionExecutedContext = new ActionExecutedContextEx(_controllerContext, _actionDescriptor, canceled: false, exception: exception)
{
ExceptionDispatchInfo = ExceptionDispatchInfo.Capture(exception),
};
}
Debug.Assert(_actionExecutedContext != null);
}
private Task Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
{
switch (next)
{
case State.InvokeBegin:
{
goto case State.AuthenticationBegin;
}
case State.AuthenticationBegin:
{
_cursor.Reset();
_authenticationContext = InvokeAuthenticationFilters(_controllerContext, _cursor.AuthenticationFilters, _actionDescriptor);
if (_authenticationContext.Result != null)
{
_result = _authenticationContext.Result;
goto case State.AuthenticationShortCircuit;
}
goto case State.AuthenticationEnd;
}
case State.AuthenticationShortCircuit:
{
Debug.Assert(_authenticationContext != null);
Debug.Assert(_authenticationContext.Result != null);
_result = _authenticationContext.Result;
authenticationChallengeBypassResultFilters = true;
goto case State.AuthenticationChallengeBegin;
}
case State.AuthenticationEnd:
{
goto case State.AuthorizationBegin;
}
case State.AuthenticationChallengeBegin:
{
_cursor.Reset();
_authenticationChallengeContext = InvokeAuthenticationFiltersChallenge(_controllerContext, _cursor.AuthenticationFilters, _actionDescriptor, _result);
// unlike other filter types, don't short-circuit evaluation when context.Result != null (since it
// starts out that way, and multiple filters may add challenges to the result)
_result = _authenticationChallengeContext.Result ?? _result;
goto case State.AuthenticationChallengeEnd;
}
case State.AuthenticationChallengeEnd:
{
Debug.Assert(_result != null);
if (authenticationChallengeBypassResultFilters)
{
// short-circuit before we started invoking the action itself
// so bypass any result filters
isCompleted = true;
InvokeActionResult(_controllerContext, _result);
resultExecuted = true;
goto case State.InvokeEnd;
}
goto case State.ResultBegin;
}
case State.AuthorizationBegin:
{
_cursor.Reset();
goto case State.AuthorizationNext;
}
case State.AuthorizationNext:
{
var current = _cursor.GetNextFilter <IAuthorizationFilter, IAsyncAuthorizationFilter>();
if (current.FilterAsync != null)
{
if (_authorizationContext == null)
{
_authorizationContext = new AuthorizationContext(_controllerContext, _actionDescriptor);
}
state = current.FilterAsync;
goto case State.AuthorizationAsyncBegin;
}
else if (current.Filter != null)
{
if (_authorizationContext == null)
{
_authorizationContext = new AuthorizationContext(_controllerContext, _actionDescriptor);
}
state = current.Filter;
goto case State.AuthorizationSync;
}
else
{
goto case State.AuthorizationEnd;
}
}
case State.AuthorizationAsyncBegin:
{
Debug.Assert(state != null);
Debug.Assert(_authorizationContext != null);
var filter = (IAsyncAuthorizationFilter)state;
var authorizationContext = _authorizationContext;
var task = filter.OnAuthorizationAsync(authorizationContext);
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.AuthorizationAsyncEnd;
return(task);
}
goto case State.AuthorizationAsyncEnd;
}
case State.AuthorizationAsyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_authorizationContext != null);
var filter = (IAsyncAuthorizationFilter)state;
var authorizationContext = _authorizationContext;
if (authorizationContext.Result != null)
{
goto case State.AuthorizationShortCircuit;
}
goto case State.AuthorizationNext;
}
case State.AuthorizationSync:
{
var filter = (IAuthorizationFilter)state;
var authorizationContext = _authorizationContext;
filter.OnAuthorization(authorizationContext);
if (authorizationContext.Result != null)
{
goto case State.AuthorizationShortCircuit;
}
goto case State.AuthorizationNext;
}
case State.AuthorizationShortCircuit:
{
Debug.Assert(_authorizationContext?.Result != null);
_result = _authorizationContext.Result;
authenticationChallengeBypassResultFilters = true;
goto case State.AuthenticationChallengeBegin;
}
case State.AuthorizationEnd:
{
goto case State.ExceptionBegin;
}
case State.ExceptionBegin:
{
_cursor.Reset();
goto case State.ExceptionNext;
}
case State.ExceptionNext:
{
var current = _cursor.GetNextFilter <IExceptionFilter, IAsyncExceptionFilter>();
if (current.FilterAsync != null)
{
state = current.FilterAsync;
goto case State.ExceptionAsyncBegin;
}
else if (current.Filter != null)
{
state = current.Filter;
goto case State.ExceptionSyncBegin;
}
else if (scope == Scope.Exception)
{
// All exception filters are on the stack already - so execute the 'inside'.
goto case State.ExceptionInside;
}
else
{
// There are no exception filters - so jump right to 'inside'.
Debug.Assert(scope == Scope.Invoker);
goto case State.ActionBegin;
}
}
case State.ExceptionAsyncBegin:
{
var task = InvokeNextExceptionFilterAsync();
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ExceptionAsyncResume;
return(task);
}
goto case State.ExceptionAsyncResume;
}
case State.ExceptionAsyncResume:
{
Debug.Assert(state != null);
var filter = (IAsyncExceptionFilter)state;
var exceptionContext = _exceptionContext;
// When we get here we're 'unwinding' the stack of exception filters. If we have an unhandled exception,
// we'll call the filter. Otherwise there's nothing to do.
if (exceptionContext?.Exception != null && !exceptionContext.ExceptionHandled)
{
var task = filter.OnExceptionAsync(exceptionContext);
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ExceptionAsyncEnd;
return(task);
}
goto case State.ExceptionAsyncEnd;
}
goto case State.ExceptionEnd;
}
case State.ExceptionAsyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_exceptionContext != null);
var filter = (IAsyncExceptionFilter)state;
var exceptionContext = _exceptionContext;
if (exceptionContext.Exception == null || exceptionContext.ExceptionHandled)
{
// We don't need to do anthing to trigger a short circuit. If there's another
// exception filter on the stack it will check the same set of conditions
// and then just skip itself.
}
goto case State.ExceptionEnd;
}
case State.ExceptionSyncBegin:
{
var task = InvokeNextExceptionFilterAsync();
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ExceptionSyncEnd;
return(task);
}
goto case State.ExceptionSyncEnd;
}
case State.ExceptionSyncEnd:
{
Debug.Assert(state != null);
var filter = (IExceptionFilter)state;
var exceptionContext = _exceptionContext;
// When we get here we're 'unwinding' the stack of exception filters. If we have an unhandled exception,
// we'll call the filter. Otherwise there's nothing to do.
if (exceptionContext?.Exception != null && !exceptionContext.ExceptionHandled)
{
filter.OnException(exceptionContext);
if (exceptionContext.Exception == null || exceptionContext.ExceptionHandled)
{
// We don't need to do anthing to trigger a short circuit. If there's another
// exception filter on the stack it will check the same set of conditions
// and then just skip itself.
}
}
goto case State.ExceptionEnd;
}
case State.ExceptionInside:
{
goto case State.ActionBegin;
}
case State.ExceptionHandled:
{
// We arrive in this state when an exception happened, but was handled by exception filters
// either by setting ExceptionHandled, or nulling out the Exception or setting a result
// on the ExceptionContext.
//
// We need to execute the result (if any) and then exit gracefully which unwinding Resource
// filters.
Debug.Assert(state != null);
Debug.Assert(_exceptionContext != null);
if (_exceptionContext.Result == null)
{
_exceptionContext.Result = new EmptyResult();
}
if (scope == Scope.Invoker)
{
Debug.Assert(_exceptionContext.Result != null);
_result = _exceptionContext.Result;
}
InvokeActionResult(_controllerContext, _result);
resultExecuted = true;
goto case State.InvokeEnd;
}
case State.ExceptionEnd:
{
var exceptionContext = _exceptionContext;
if (scope == Scope.Exception)
{
isCompleted = true;
return(TaskHelpers.CompletedTask);
}
if (exceptionContext != null)
{
if (exceptionContext.Exception == null ||
exceptionContext.ExceptionHandled)
{
goto case State.ExceptionHandled;
}
Rethrow(exceptionContext);
Debug.Fail("unreachable");
}
if (resultExecuted)
{
// MVC5 wraps the result in the Exception filter scope
// MVC Core does not
// This flag indicates what to do at this point after we unwrap from invoking the action
goto case State.InvokeEnd;
}
goto case State.ResultBegin;
}
case State.ActionBegin:
{
if (_controllerContext.Controller.ValidateRequest)
{
ValidateRequest(_controllerContext);
}
_cursor.Reset();
goto case State.ActionNext;
}
case State.ActionNext:
{
var current = _cursor.GetNextFilter <IActionFilter, IAsyncActionFilter>();
if (current.FilterAsync != null)
{
if (_actionExecutingContext == null)
{
_actionExecutingContext = new ActionExecutingContext(_controllerContext, _actionDescriptor, _parameters);
}
state = current.FilterAsync;
goto case State.ActionAsyncBegin;
}
else if (current.Filter != null)
{
if (_actionExecutingContext == null)
{
_actionExecutingContext = new ActionExecutingContext(_controllerContext, _actionDescriptor, _parameters);
}
state = current.Filter;
goto case State.ActionSyncBegin;
}
else
{
goto case State.ActionInside;
}
}
case State.ActionAsyncBegin:
{
Debug.Assert(state != null);
Debug.Assert(_actionExecutingContext != null);
var filter = (IAsyncActionFilter)state;
var actionExecutingContext = _actionExecutingContext;
var task = filter.OnActionExecutionAsync(actionExecutingContext, InvokeNextActionFilterAwaitedAsync);
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ActionAsyncEnd;
return(task);
}
goto case State.ActionAsyncEnd;
}
case State.ActionAsyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_actionExecutingContext != null);
var filter = (IAsyncActionFilter)state;
if (_actionExecutedContext == null)
{
// If we get here then the filter didn't call 'next' indicating a short circuit.
_actionExecutedContext = new ActionExecutedContextEx(_controllerContext, _actionDescriptor, canceled: true, exception: null)
{
Result = _actionExecutingContext.Result,
};
}
goto case State.ActionEnd;
}
case State.ActionSyncBegin:
{
Debug.Assert(state != null);
Debug.Assert(_actionExecutingContext != null);
var filter = (IActionFilter)state;
var actionExecutingContext = _actionExecutingContext;
filter.OnActionExecuting(actionExecutingContext);
if (actionExecutingContext.Result != null)
{
// Short-circuited by setting a result.
_actionExecutedContext = new ActionExecutedContextEx(_controllerContext, _actionDescriptor, canceled: true, exception: null)
{
Result = _actionExecutingContext.Result,
};
goto case State.ActionEnd;
}
var task = InvokeNextActionFilterAsync();
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ActionSyncEnd;
return(task);
}
goto case State.ActionSyncEnd;
}
case State.ActionSyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_actionExecutingContext != null);
Debug.Assert(_actionExecutedContext != null);
var filter = (IActionFilter)state;
var actionExecutedContext = _actionExecutedContext;
filter.OnActionExecuted(actionExecutedContext);
goto case State.ActionEnd;
}
case State.ActionInside:
{
var task = InvokeActionMethodAsync();
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ActionEnd;
return(task);
}
goto case State.ActionEnd;
}
case State.ActionEnd:
{
if (scope == Scope.Action)
{
if (_actionExecutedContext == null)
{
_actionExecutedContext = new ActionExecutedContextEx(_controllerContext, _actionDescriptor, canceled: false, exception: null)
{
Result = _result,
};
}
isCompleted = true;
return(TaskHelpers.CompletedTask);
}
var actionExecutedContext = _actionExecutedContext;
Rethrow(actionExecutedContext);
if (actionExecutedContext != null)
{
_result = actionExecutedContext.Result;
}
goto case State.AuthenticationChallengeBegin;
}
case State.ResultBegin:
{
_cursor.Reset();
goto case State.ResultNext;
}
case State.ResultNext:
{
var current = _cursor.GetNextFilter <IResultFilter, IAsyncResultFilter>();
if (current.FilterAsync != null)
{
if (_resultExecutingContext == null)
{
_resultExecutingContext = new ResultExecutingContext(_controllerContext, _result);
}
state = current.FilterAsync;
goto case State.ResultAsyncBegin;
}
else if (current.Filter != null)
{
if (_resultExecutingContext == null)
{
_resultExecutingContext = new ResultExecutingContext(_controllerContext, _result);
}
state = current.Filter;
goto case State.ResultSyncBegin;
}
else
{
goto case State.ResultInside;
}
}
case State.ResultAsyncBegin:
{
Debug.Assert(state != null);
Debug.Assert(_resultExecutingContext != null);
var filter = (IAsyncResultFilter)state;
var resultExecutingContext = _resultExecutingContext;
var task = filter.OnResultExecutionAsync(resultExecutingContext, InvokeNextResultFilterAwaitedAsync);
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ResultAsyncEnd;
return(task);
}
goto case State.ResultAsyncEnd;
}
case State.ResultAsyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_resultExecutingContext != null);
var filter = (IAsyncResultFilter)state;
var resultExecutingContext = _resultExecutingContext;
var resultExecutedContext = _resultExecutedContext;
if (resultExecutedContext == null || resultExecutingContext.Cancel == true)
{
// Short-circuited by not calling next || Short-circuited by setting Cancel == true
_resultExecutedContext = new ResultExecutedContextEx(_controllerContext, resultExecutingContext.Result, canceled: true, exception: null);
}
goto case State.ResultEnd;
}
case State.ResultSyncBegin:
{
Debug.Assert(state != null);
Debug.Assert(_resultExecutingContext != null);
var filter = (IResultFilter)state;
var resultExecutingContext = _resultExecutingContext;
filter.OnResultExecuting(resultExecutingContext);
if (_resultExecutingContext.Cancel == true)
{
// Short-circuited by setting Cancel == true
_resultExecutedContext = new ResultExecutedContextEx(_controllerContext, resultExecutingContext.Result, canceled: true, exception: null);
goto case State.ResultEnd;
}
var task = InvokeNextResultFilterAsync();
if (task.Status != TaskStatus.RanToCompletion)
{
next = State.ResultSyncEnd;
return(task);
}
goto case State.ResultSyncEnd;
}
case State.ResultSyncEnd:
{
Debug.Assert(state != null);
Debug.Assert(_resultExecutingContext != null);
Debug.Assert(_resultExecutedContext != null);
var filter = (IResultFilter)state;
var resultExecutedContext = _resultExecutedContext;
filter.OnResultExecuted(resultExecutedContext);
goto case State.ResultEnd;
}
case State.ResultInside:
{
// If we executed result filters then we need to grab the result from there.
if (_resultExecutingContext != null)
{
_result = _resultExecutingContext.Result;
}
if (_result == null)
{
// The empty result is always flowed back as the 'executed' result if we don't have one.
_result = new EmptyResult();
}
InvokeActionResult(_controllerContext, _result);
resultExecuted = true;
goto case State.ResultEnd;
}
case State.ResultEnd:
{
var result = _result;
if (scope == Scope.Result)
{
if (_resultExecutedContext == null)
{
_resultExecutedContext = new ResultExecutedContextEx(_controllerContext, result, canceled: false, exception: null);
}
isCompleted = true;
return(TaskHelpers.CompletedTask);
}
Rethrow(_resultExecutedContext);
goto case State.InvokeEnd;
}
case State.InvokeEnd:
{
isCompleted = true;
return(TaskHelpers.CompletedTask);
}
default:
throw new InvalidOperationException();
}
}