Add IHttpHandler members to HttpContext

src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/Features/IHttpHandlerFeature.cs

@@ -0,0 +1,28 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#if NETCOREAPP
+
+using System.Diagnostics.CodeAnalysis;
+using System.Web;
+
+namespace Microsoft.AspNetCore.SystemWebAdapters.Features;
+
+/// <summary>
+/// Represents the handlers for a given request.
+/// </summary>
+[Experimental(Constants.ExperimentalFeatures.DiagnosticId)]
+public interface IHttpHandlerFeature
+{
+    /// <summary>
+    /// Gets or sets the current <see cref="IHttpHandler"/>.
+    /// </summary>
+    IHttpHandler? Current { get; set; }
+
+    /// <summary>
+    /// Gets the previous handlers. When <see cref="Current"/> is set, the previous value should be surfaced here.
+    /// </summary>
+    IHttpHandler? Previous { get; }
+}
+
+#endif

src/Microsoft.AspNetCore.SystemWebAdapters/Generated/Header.txt

@@ -18,4 +18,5 @@
 #pragma warning disable CA1063 // Implement IDisposable Correctly
 #pragma warning disable CA1816 // Dispose methods should call SuppressFinalize
 #pragma warning disable CS0436 // Type conflicts with imported type
+#pragma warning disable CA1040 // Avoid empty interfaces
 

src/Microsoft.AspNetCore.SystemWebAdapters/Generated/Ref.Standard.cs

@@ -18,6 +18,7 @@
 #pragma warning disable CA1063 // Implement IDisposable Correctly
 #pragma warning disable CA1816 // Dispose methods should call SuppressFinalize
 #pragma warning disable CS0436 // Type conflicts with imported type
+#pragma warning disable CA1040 // Avoid empty interfaces
 
 namespace System.Web
 {
@@ -139,11 +140,14 @@ internal HttpContext() { }
         public System.Web.HttpApplication ApplicationInstance { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Web.Caching.Cache Cache { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public static System.Web.HttpContext Current { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} set { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public System.Web.IHttpHandler CurrentHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Web.RequestNotification CurrentNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Exception Error { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public System.Web.IHttpHandler Handler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} set { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public bool IsDebuggingEnabled { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public bool IsPostNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Collections.IDictionary Items { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public System.Web.IHttpHandler PreviousHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Web.HttpRequest Request { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Web.HttpResponse Response { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public System.Web.HttpServerUtility Server { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
@@ -154,6 +158,7 @@ internal HttpContext() { }
         public void AddError(System.Exception ex) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public void ClearError() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public System.Web.ISubscriptionToken DisposeOnPipelineCompleted(System.IDisposable target) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        public void RemapHandler(System.Web.IHttpHandler handler) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public void RewritePath(string path) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public void RewritePath(string path, bool rebaseClientPath) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public void RewritePath(string filePath, string pathInfo, string queryString) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
@@ -168,11 +173,14 @@ public partial class HttpContextBase : System.IServiceProvider
         public virtual System.Web.HttpApplicationState Application { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.HttpApplication ApplicationInstance { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.Caching.Cache Cache { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public virtual System.Web.IHttpHandler CurrentHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.RequestNotification CurrentNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Exception Error { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public virtual System.Web.IHttpHandler Handler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} set { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual bool IsDebuggingEnabled { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual bool IsPostNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Collections.IDictionary Items { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public virtual System.Web.IHttpHandler PreviousHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.HttpRequestBase Request { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.HttpResponseBase Response { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public virtual System.Web.HttpServerUtilityBase Server { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
@@ -182,6 +190,7 @@ public partial class HttpContextBase : System.IServiceProvider
         public virtual void AddError(System.Exception ex) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public virtual void ClearError() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public virtual object GetService(System.Type serviceType) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        public virtual void RemapHandler(System.Web.IHttpHandler handler) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public virtual void RewritePath(string path) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public virtual void RewritePath(string path, bool rebaseClientPath) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public virtual void RewritePath(string filePath, string pathInfo, string queryString) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
@@ -195,11 +204,14 @@ public partial class HttpContextWrapper : System.Web.HttpContextBase
         public override System.Web.HttpApplicationState Application { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.HttpApplication ApplicationInstance { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.Caching.Cache Cache { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public override System.Web.IHttpHandler CurrentHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.RequestNotification CurrentNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Exception Error { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public override System.Web.IHttpHandler Handler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} set { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override bool IsDebuggingEnabled { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override bool IsPostNotification { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Collections.IDictionary Items { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        public override System.Web.IHttpHandler PreviousHandler { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.HttpRequestBase Request { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.HttpResponseBase Response { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
         public override System.Web.HttpServerUtilityBase Server { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
@@ -209,6 +221,7 @@ public partial class HttpContextWrapper : System.Web.HttpContextBase
         public override void AddError(System.Exception ex) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override void ClearError() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override object GetService(System.Type serviceType) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        public override void RemapHandler(System.Web.IHttpHandler handler) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override void RewritePath(string path) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override void RewritePath(string path, bool rebaseClientPath) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override void RewritePath(string filePath, string pathInfo, string queryString) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
@@ -671,12 +684,32 @@ public partial class HttpSessionStateWrapper : System.Web.HttpSessionStateBase
         public override void Remove(string name) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public override void RemoveAll() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
     }
+    public abstract partial class HttpTaskAsyncHandler : System.Web.IHttpAsyncHandler, System.Web.IHttpHandler
+    {
+        protected HttpTaskAsyncHandler() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        public virtual bool IsReusable { get { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");} }
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        public virtual void ProcessRequest(System.Web.HttpContext context) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        public abstract System.Threading.Tasks.Task ProcessRequestAsync(System.Web.HttpContext context);
+        System.IAsyncResult System.Web.IHttpAsyncHandler.BeginProcessRequest(System.Web.HttpContext context, System.AsyncCallback cb, object extraData) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+        void System.Web.IHttpAsyncHandler.EndProcessRequest(System.IAsyncResult result) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
+    }
     public sealed partial class HttpUnhandledException : System.Web.HttpException
     {
         public HttpUnhandledException() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public HttpUnhandledException(string message) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public HttpUnhandledException(string message, System.Exception innerException) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
     }
+    public partial interface IHttpAsyncHandler : System.Web.IHttpHandler
+    {
+        System.IAsyncResult BeginProcessRequest(System.Web.HttpContext context, System.AsyncCallback cb, object extraData);
+        void EndProcessRequest(System.IAsyncResult result);
+    }
+    public partial interface IHttpHandler
+    {
+        bool IsReusable { get; }
+        void ProcessRequest(System.Web.HttpContext context);
+    }
     public partial interface IHttpModule
     {
         void Dispose();
@@ -867,6 +900,12 @@ internal HttpSessionState() { }
         public void Remove(string name) { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
         public void RemoveAll() { throw new System.PlatformNotSupportedException("Only supported when running on ASP.NET Core or System.Web");}
     }
+    public partial interface IReadOnlySessionState : System.Web.SessionState.IRequiresSessionState
+    {
+    }
+    public partial interface IRequiresSessionState
+    {
+    }
     public enum SessionStateBehavior
     {
         Default = 0,

src/Microsoft.AspNetCore.SystemWebAdapters/Generated/TypeForwards.Framework.cs

@@ -18,6 +18,7 @@
 #pragma warning disable CA1063 // Implement IDisposable Correctly
 #pragma warning disable CA1816 // Dispose methods should call SuppressFinalize
 #pragma warning disable CS0436 // Type conflicts with imported type
+#pragma warning disable CA1040 // Avoid empty interfaces
 
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpApplication))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpApplicationState))]
@@ -52,7 +53,10 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpServerUtilityWrapper))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpSessionStateBase))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpSessionStateWrapper))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpTaskAsyncHandler))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.HttpUnhandledException))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.IHttpAsyncHandler))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.IHttpHandler))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.IHttpModule))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.ISubscriptionToken))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.ReadEntityBodyMode))]
@@ -70,5 +74,7 @@
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.Hosting.HostingEnvironment))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.Security.MachineKey))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.SessionState.HttpSessionState))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.SessionState.IReadOnlySessionState))]
+[assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.SessionState.IRequiresSessionState))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.SessionState.SessionStateBehavior))]
 [assembly:System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Web.SessionState.SessionStateMode))]

src/Microsoft.AspNetCore.SystemWebAdapters/HttpContext.cs

@@ -80,6 +80,18 @@ public IDictionary Items
 
     public Cache Cache => Context.RequestServices.GetRequiredService<Cache>();
 
+    public IHttpHandler? Handler
+    {
+        get => Context.Features.GetRequired<IHttpHandlerFeature>().Current;
+        set => Context.Features.GetRequired<IHttpHandlerFeature>().Current = value;
+    }
+
+    public IHttpHandler? CurrentHandler => Handler;
+
+    public IHttpHandler? PreviousHandler => Context.Features.GetRequired<IHttpHandlerFeature>().Previous;
+
+    public void RemapHandler(IHttpHandler handler) => Handler = handler;
+
     /// <summary>
     /// Gets whether the current request is running in the development environment.
     /// </summary>