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namespace System.Web.Mvc {
using System;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Threading;
using System.Web;
using System.Web.Mvc.Async;
using System.Web.Mvc.Resources;
using System.Web.Routing;
using System.Web.SessionState;
using Microsoft.Web.Infrastructure.DynamicValidationHelper;
public class MvcHandler : IHttpAsyncHandler, IHttpHandler, IRequiresSessionState {
private static readonly object _processRequestTag = new object();
private ControllerBuilder _controllerBuilder;
internal static readonly string MvcVersion = GetMvcVersionString();
public static readonly string MvcVersionHeaderName = "X-AspNetMvc-Version";
public MvcHandler(RequestContext requestContext) {
if (requestContext == null) {
throw new ArgumentNullException("requestContext");
}
RequestContext = requestContext;
}
internal ControllerBuilder ControllerBuilder {
get {
if (_controllerBuilder == null) {
_controllerBuilder = ControllerBuilder.Current;
}
return _controllerBuilder;
}
set {
_controllerBuilder = value;
}
}
public static bool DisableMvcResponseHeader {
get;
set;
}
protected virtual bool IsReusable {
get {
return false;
}
}
public RequestContext RequestContext {
get;
private set;
}
protected internal virtual void AddVersionHeader(HttpContextBase httpContext) {
if (!DisableMvcResponseHeader) {
httpContext.Response.AppendHeader(MvcVersionHeaderName, MvcVersion);
}
}
protected virtual IAsyncResult BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, object state) {
HttpContextBase iHttpContext = new HttpContextWrapper(httpContext);
return BeginProcessRequest(iHttpContext, callback, state);
}
protected internal virtual IAsyncResult BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, object state) {
return SecurityUtil.ProcessInApplicationTrust(() => {
IController controller;
IControllerFactory factory;
ProcessRequestInit(httpContext, out controller, out factory);
IAsyncController asyncController = controller as IAsyncController;
if (asyncController != null) {
// asynchronous controller
BeginInvokeDelegate beginDelegate = delegate(AsyncCallback asyncCallback, object asyncState) {
try {
return asyncController.BeginExecute(RequestContext, asyncCallback, asyncState);
}
catch {
factory.ReleaseController(asyncController);
throw;
}
};
EndInvokeDelegate endDelegate = delegate(IAsyncResult asyncResult) {
try {
asyncController.EndExecute(asyncResult);
}
finally {
factory.ReleaseController(asyncController);
}
};
SynchronizationContext syncContext = SynchronizationContextUtil.GetSynchronizationContext();
AsyncCallback newCallback = AsyncUtil.WrapCallbackForSynchronizedExecution(callback, syncContext);
return AsyncResultWrapper.Begin(newCallback, state, beginDelegate, endDelegate, _processRequestTag);
}
else {
// synchronous controller
Action action = delegate {
try {
controller.Execute(RequestContext);
}
finally {
factory.ReleaseController(controller);
}
};
return AsyncResultWrapper.BeginSynchronous(callback, state, action, _processRequestTag);
}
});
}
protected internal virtual void EndProcessRequest(IAsyncResult asyncResult) {
SecurityUtil.ProcessInApplicationTrust(() => {
AsyncResultWrapper.End(asyncResult, _processRequestTag);
});
}
private static string GetMvcVersionString() {
// DevDiv 216459:
// This code originally used Assembly.GetName(), but that requires FileIOPermission, which isn't granted in
// medium trust. However, Assembly.FullName *is* accessible in medium trust.
return new AssemblyName(typeof(MvcHandler).Assembly.FullName).Version.ToString(2);
}
protected virtual void ProcessRequest(HttpContext httpContext) {
HttpContextBase iHttpContext = new HttpContextWrapper(httpContext);
ProcessRequest(iHttpContext);
}
protected internal virtual void ProcessRequest(HttpContextBase httpContext) {
SecurityUtil.ProcessInApplicationTrust(() => {
IController controller;
IControllerFactory factory;
ProcessRequestInit(httpContext, out controller, out factory);
try {
controller.Execute(RequestContext);
}
finally {
factory.ReleaseController(controller);
}
});
}
private void ProcessRequestInit(HttpContextBase httpContext, out IController controller, out IControllerFactory factory) {
// If request validation has already been enabled, make it lazy. This allows attributes like [HttpPost] (which looks
// at Request.Form) to work correctly without triggering full validation.
bool? isRequestValidationEnabled = ValidationUtility.IsValidationEnabled(HttpContext.Current);
if (isRequestValidationEnabled == true) {
ValidationUtility.EnableDynamicValidation(HttpContext.Current);
}
AddVersionHeader(httpContext);
RemoveOptionalRoutingParameters();
// Get the controller type
string controllerName = RequestContext.RouteData.GetRequiredString("controller");
// Instantiate the controller and call Execute
factory = ControllerBuilder.GetControllerFactory();
controller = factory.CreateController(RequestContext, controllerName);
if (controller == null) {
throw new InvalidOperationException(
String.Format(
CultureInfo.CurrentCulture,
MvcResources.ControllerBuilder_FactoryReturnedNull,
factory.GetType(),
controllerName));
}
}
private void RemoveOptionalRoutingParameters() {
RouteValueDictionary rvd = RequestContext.RouteData.Values;
// Get all keys for which the corresponding value is 'Optional'.
// ToArray() necessary so that we don't manipulate the dictionary while enumerating.
string[] matchingKeys = (from entry in rvd
where entry.Value == UrlParameter.Optional
select entry.Key).ToArray();
foreach (string key in matchingKeys) {
rvd.Remove(key);
}
}
#region IHttpHandler Members
bool IHttpHandler.IsReusable {
get {
return IsReusable;
}
}
void IHttpHandler.ProcessRequest(HttpContext httpContext) {
ProcessRequest(httpContext);
}
#endregion
#region IHttpAsyncHandler Members
IAsyncResult IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) {
return BeginProcessRequest(context, cb, extraData);
}
void IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) {
EndProcessRequest(result);
}
#endregion
}
}
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