ServiceHttpModule.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / System.ServiceModel.Activation / System / ServiceModel / Activation / ServiceHttpModule.cs / 1305376 / ServiceHttpModule.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.ServiceModel.Activation 
{
    using System.Diagnostics; 
    using System.Runtime; 
    using System.Security;
    using System.ServiceModel; 
    using System.Web;

    class ServiceHttpModule : IHttpModule
    { 
        [Fx.Tag.SecurityNote(Critical = "Holds pointer to BeginProcessRequest which is SecurityCritical." +
            "This callback is called outside the PermitOnly context.")] 
        [SecurityCritical] 
        static BeginEventHandler beginEventHandler;
        //no need to invoke callback for non-WCF requests. 
        static CompletedAsyncResult cachedAsyncResult = new CompletedAsyncResult(null, null);

        [Fx.Tag.SecurityNote(Critical = "This callback is called outside the PermitOnly context.")]
        [SecurityCritical] 
        static EndEventHandler endEventHandler;
 
        static bool disabled; 

        [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - called outside PermitOnly context.")] 
        public void Dispose()
        {
        }
 
        [Fx.Tag.SecurityNote(Critical = "Entry-point from ASP.NET, accesses begin/bndProcessRequest which are SecurityCritical.")]
        [SecurityCritical] 
        public void Init(HttpApplication context) 
        {
            if (ServiceHttpModule.beginEventHandler == null) 
            {
                ServiceHttpModule.beginEventHandler = new BeginEventHandler(BeginProcessRequest);
            }
            if (ServiceHttpModule.endEventHandler == null) 
            {
                ServiceHttpModule.endEventHandler = new EndEventHandler(EndProcessRequest); 
            } 
            context.AddOnPostAuthenticateRequestAsync(
                ServiceHttpModule.beginEventHandler, 
                ServiceHttpModule.endEventHandler);
        }

        [Fx.Tag.SecurityNote(Critical = "Entry-point from asp.net, called outside PermitOnly context. ASP.NET calls are critical." + 
            "HostedHttpRequestAsyncResult..ctor is critical because it captures HostedImpersonationContext (and makes it available later) " +
            "so caller must ensure that this is called in the right place.")] 
        [SecurityCritical] 
        static public IAsyncResult BeginProcessRequest(object sender, EventArgs e, AsyncCallback cb, object extraData)
        { 
            if (ServiceHttpModule.disabled)
            {
                return cachedAsyncResult;
            } 

            try 
            { 
                ServiceHostingEnvironment.SafeEnsureInitialized();
            } 
            catch (SecurityException exception)
            {
                ServiceHttpModule.disabled = true;
 
                if (DiagnosticUtility.ShouldTraceWarning)
                { 
                    DiagnosticUtility.ExceptionUtility.TraceHandledException(exception, TraceEventType.Warning); 
                }
 
                // If requesting a .svc file, the HttpHandler will try to handle it.  It will call
                // SafeEnsureInitialized() again, which will fail with the same exception (it is
                // idempotent on failure).  This is the correct behavior.
                return cachedAsyncResult; 
            }
 
            HttpApplication application = (HttpApplication) sender; 

            // Check to see whether the extension is supported. 
            string extension = application.Request.CurrentExecutionFilePathExtension;
            if (string.IsNullOrEmpty(extension))
            {
                return cachedAsyncResult; 
            }
 
            ServiceHostingEnvironment.ServiceType serviceType = ServiceHostingEnvironment.GetServiceType(extension); 
            // do extension check first so that we do not need to do it in aspnetrouting/configurationbasedactivation
            if (serviceType == ServiceHostingEnvironment.ServiceType.Unknown) 
            {
                return cachedAsyncResult;
            }
 

            // check for AspNetcompat 
            if (ServiceHostingEnvironment.AspNetCompatibilityEnabled) 
            {
                // remap httphandler for xamlx in CBA, since there is No physical file and 
                // the xamlx httphandlerfactory will do file exist checking
                if (serviceType == ServiceHostingEnvironment.ServiceType.Workflow && ServiceHostingEnvironment.IsConfigurationBasedService(application))
                {
                    IHttpHandler cbaHandler = new ServiceHttpHandlerFactory().GetHandler( 
                        application.Context, application.Request.RequestType,
                        application.Request.RawUrl.ToString(), application.Request.PhysicalApplicationPath); 
                    application.Context.RemapHandler(cbaHandler); 
                }
                return cachedAsyncResult; 
            }

            if (serviceType == ServiceHostingEnvironment.ServiceType.WCF)
            { 
                return new HostedHttpRequestAsyncResult(application, false, false, cb, extraData);
            } 
            if (serviceType == ServiceHostingEnvironment.ServiceType.Workflow) 
            {
                return new HostedHttpRequestAsyncResult(application, false, true, cb, extraData); 
            }
            return cachedAsyncResult;
        }
 
        [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - called outside PermitOnly context.")]
        static public void EndProcessRequest(IAsyncResult ar) 
        { 
            //No need to call CompletedAsyncResult.End as the asyncResult has already completed.
            if (ar is HostedHttpRequestAsyncResult) 
            {
                HostedHttpRequestAsyncResult.End(ar);
            }
        } 
    }
} 
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ServiceHttpModule.cs source code in C# .NET

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