[release/7.0] Add and use RDF.InferMetadata and update new PopulateMetadata API

src/Http/Http.Abstractions/src/EndpointFilterFactoryContext.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Reflection;
-using Microsoft.AspNetCore.Builder;
 
 namespace Microsoft.AspNetCore.Http;
 
@@ -13,34 +12,21 @@ namespace Microsoft.AspNetCore.Http;
 public sealed class EndpointFilterFactoryContext
 {
     /// <summary>
-    /// Creates a new instance of the <see cref="EndpointFilterFactoryContext"/>.
+    /// The <see cref="MethodInfo"/> associated with the current route handler, <see cref="RequestDelegate"/> or MVC action.
     /// </summary>
-    /// <param name="methodInfo">The <see cref="MethodInfo"/> associated with the route handler of the current request.</param>
-    /// <param name="endpointMetadata">The <see cref="EndpointBuilder.Metadata"/> associated with the endpoint the filter is targeting.</param>
-    /// <param name="applicationServices">The <see cref="IServiceProvider"/> instance used to access the application services.</param>
-    public EndpointFilterFactoryContext(MethodInfo methodInfo, IList<object> endpointMetadata, IServiceProvider applicationServices)
-    {
-        ArgumentNullException.ThrowIfNull(methodInfo);
-        ArgumentNullException.ThrowIfNull(endpointMetadata);
-        ArgumentNullException.ThrowIfNull(applicationServices);
-
-        MethodInfo = methodInfo;
-        EndpointMetadata = endpointMetadata;
-        ApplicationServices = applicationServices;
-    }
-
-    /// <summary>
-    /// The <see cref="MethodInfo"/> associated with the current route handler.
-    /// </summary>
-    public MethodInfo MethodInfo { get; }
-
-    /// <summary>
-    /// The <see cref="EndpointMetadataCollection"/> associated with the current endpoint.
-    /// </summary>
-    public IList<object> EndpointMetadata { get; }
+    /// <remarks>
+    /// In the future this could support more endpoint types.
+    /// </remarks>
+    public required MethodInfo MethodInfo { get; init; }
 
     /// <summary>
     /// Gets the <see cref="IServiceProvider"/> instance used to access application services.
     /// </summary>
-    public IServiceProvider ApplicationServices { get; }
+    public IServiceProvider ApplicationServices { get; init; } = EmptyServiceProvider.Instance;
+
+    private sealed class EmptyServiceProvider : IServiceProvider
+    {
+        public static EmptyServiceProvider Instance { get; } = new EmptyServiceProvider();
+        public object? GetService(Type serviceType) => null;
+    }
 }

src/Http/Http.Abstractions/src/Extensions/EndpointBuilder.cs

@@ -10,10 +10,12 @@ namespace Microsoft.AspNetCore.Builder;
 /// </summary>
 public abstract class EndpointBuilder
 {
+    private List<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>>? _filterFactories;
+
     /// <summary>
     /// Gets the list of filters that apply to this endpoint.
     /// </summary>
-    public IList<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>> FilterFactories { get; } = new List<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>>();
+    public IList<Func<EndpointFilterFactoryContext, EndpointFilterDelegate, EndpointFilterDelegate>> FilterFactories => _filterFactories ??= new();
 
     /// <summary>
     /// Gets or sets the delegate used to process requests for the endpoint.
@@ -33,7 +35,7 @@ public abstract class EndpointBuilder
     /// <summary>
     /// Gets the <see cref="IServiceProvider"/> associated with the endpoint.
     /// </summary>
-    public IServiceProvider ApplicationServices { get; set; } = EmptyServiceProvider.Instance;
+    public IServiceProvider ApplicationServices { get; init; } = EmptyServiceProvider.Instance;
 
     /// <summary>
     /// Creates an instance of <see cref="Endpoint"/> from the <see cref="EndpointBuilder"/>.

src/Http/Http.Abstractions/src/Metadata/IEndpointMetadataProvider.cs

@@ -0,0 +1,26 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Reflection;
+using Microsoft.AspNetCore.Builder;
+
+namespace Microsoft.AspNetCore.Http.Metadata;
+
+/// <summary>
+/// Indicates that a type provides a static method that provides <see cref="Endpoint"/> metadata when declared as a parameter type or the
+/// returned type of an <see cref="Endpoint"/> route handler delegate.
+/// </summary>
+public interface IEndpointMetadataProvider
+{
+    /// <summary>
+    /// Populates metadata for the related <see cref="Endpoint"/> and <see cref="MethodInfo"/>.
+    /// </summary>
+    /// <remarks>
+    /// This method is called by RequestDelegateFactory when creating a <see cref="RequestDelegate"/> and by MVC when creating endpoints for controller actions.
+    /// This is called for each parameter and return type of the route handler or action with a declared type implementing this interface.
+    /// Add or remove objects on the <see cref="EndpointBuilder.Metadata"/> property of the <paramref name="builder"/> to modify the <see cref="Endpoint.Metadata"/> being built.
+    /// </remarks>
+    /// <param name="method">The <see cref="MethodInfo"/> of the route handler delegate or MVC Action of the endpoint being created.</param>
+    /// <param name="builder">The <see cref="EndpointBuilder"/> used to construct the endpoint for the given <paramref name="method"/>.</param>
+    static abstract void PopulateMetadata(MethodInfo method, EndpointBuilder builder);
+}

src/Http/Http.Abstractions/src/Metadata/IEndpointParameterMetadataProvider.cs

@@ -0,0 +1,26 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Reflection;
+using Microsoft.AspNetCore.Builder;
+
+namespace Microsoft.AspNetCore.Http.Metadata;
+
+/// <summary>
+/// Indicates that a type provides a static method that provides <see cref="Endpoint"/> metadata when declared as the
+/// parameter type of an <see cref="Endpoint"/> route handler delegate.
+/// </summary>
+public interface IEndpointParameterMetadataProvider
+{
+    /// <summary>
+    /// Populates metadata for the related <see cref="Endpoint"/> and <see cref="ParameterInfo"/>.
+    /// </summary>
+    /// <remarks>
+    /// This method is called by RequestDelegateFactory when creating a <see cref="RequestDelegate"/> and by MVC when creating endpoints for controller actions.
+    /// This is called for each parameter of the route handler or action with a declared type implementing this interface.
+    /// Add or remove objects on the <see cref="EndpointBuilder.Metadata"/> property of the <paramref name="builder"/> to modify the <see cref="Endpoint.Metadata"/> being built.
+    /// </remarks>
+    /// <param name="parameter">The <see cref="ParameterInfo"/> of the route handler delegate or MVC Action of the endpoint being created.</param>
+    /// <param name="builder">The <see cref="EndpointBuilder"/> used to construct the endpoint for the given <paramref name="parameter"/>.</param>
+    static abstract void PopulateMetadata(ParameterInfo parameter, EndpointBuilder builder);
+}

src/Http/Http.Abstractions/src/PublicAPI.Unshipped.txt

@@ -5,7 +5,7 @@ abstract Microsoft.AspNetCore.Http.EndpointFilterInvocationContext.Arguments.get
 abstract Microsoft.AspNetCore.Http.EndpointFilterInvocationContext.GetArgument<T>(int index) -> T
 abstract Microsoft.AspNetCore.Http.EndpointFilterInvocationContext.HttpContext.get -> Microsoft.AspNetCore.Http.HttpContext!
 Microsoft.AspNetCore.Builder.EndpointBuilder.ApplicationServices.get -> System.IServiceProvider!
-Microsoft.AspNetCore.Builder.EndpointBuilder.ApplicationServices.set -> void
+Microsoft.AspNetCore.Builder.EndpointBuilder.ApplicationServices.init -> void
 Microsoft.AspNetCore.Builder.EndpointBuilder.FilterFactories.get -> System.Collections.Generic.IList<System.Func<Microsoft.AspNetCore.Http.EndpointFilterFactoryContext!, Microsoft.AspNetCore.Http.EndpointFilterDelegate!, Microsoft.AspNetCore.Http.EndpointFilterDelegate!>!>!
 Microsoft.AspNetCore.Builder.IEndpointConventionBuilder.Finally(System.Action<Microsoft.AspNetCore.Builder.EndpointBuilder!>! finallyConvention) -> void
 Microsoft.AspNetCore.Http.AsParametersAttribute
@@ -16,9 +16,10 @@ Microsoft.AspNetCore.Http.DefaultEndpointFilterInvocationContext.DefaultEndpoint
 Microsoft.AspNetCore.Http.EndpointFilterDelegate
 Microsoft.AspNetCore.Http.EndpointFilterFactoryContext
 Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.ApplicationServices.get -> System.IServiceProvider!
-Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.EndpointFilterFactoryContext(System.Reflection.MethodInfo! methodInfo, System.Collections.Generic.IList<object!>! endpointMetadata, System.IServiceProvider! applicationServices) -> void
-Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.EndpointMetadata.get -> System.Collections.Generic.IList<object!>!
+Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.ApplicationServices.init -> void
+Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.EndpointFilterFactoryContext() -> void
 Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.MethodInfo.get -> System.Reflection.MethodInfo!
+Microsoft.AspNetCore.Http.EndpointFilterFactoryContext.MethodInfo.init -> void
 Microsoft.AspNetCore.Http.EndpointFilterInvocationContext
 Microsoft.AspNetCore.Http.EndpointFilterInvocationContext.EndpointFilterInvocationContext() -> void
 Microsoft.AspNetCore.Http.EndpointMetadataCollection.Enumerator.Current.get -> object!
@@ -68,6 +69,10 @@ abstract Microsoft.AspNetCore.Http.HttpResponse.ContentType.get -> string?
 Microsoft.AspNetCore.Http.Metadata.ISkipStatusCodePagesMetadata
 Microsoft.AspNetCore.Http.Metadata.IEndpointDescriptionMetadata
 Microsoft.AspNetCore.Http.Metadata.IEndpointDescriptionMetadata.Description.get -> string!
+Microsoft.AspNetCore.Http.Metadata.IEndpointMetadataProvider
+Microsoft.AspNetCore.Http.Metadata.IEndpointMetadataProvider.PopulateMetadata(System.Reflection.MethodInfo! method, Microsoft.AspNetCore.Builder.EndpointBuilder! builder) -> void
+Microsoft.AspNetCore.Http.Metadata.IEndpointParameterMetadataProvider
+Microsoft.AspNetCore.Http.Metadata.IEndpointParameterMetadataProvider.PopulateMetadata(System.Reflection.ParameterInfo! parameter, Microsoft.AspNetCore.Builder.EndpointBuilder! builder) -> void
 Microsoft.AspNetCore.Http.Metadata.IEndpointSummaryMetadata
 Microsoft.AspNetCore.Http.Metadata.IEndpointSummaryMetadata.Summary.get -> string!
 Microsoft.AspNetCore.Mvc.ProblemDetails

src/Http/Http.Extensions/src/Microsoft.AspNetCore.Http.Extensions.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>ASP.NET Core common extension methods for HTTP abstractions, HTTP headers, HTTP request/response, and session state.</Description>
@@ -14,6 +14,7 @@
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)ObjectMethodExecutor\**\*.cs" LinkBase="Shared"/>
     <Compile Include="$(SharedSourceRoot)ParameterBindingMethodCache.cs" LinkBase="Shared"/>
+    <Compile Include="$(SharedSourceRoot)EndpointMetadataPopulator.cs" LinkBase="Shared"/>
     <Compile Include="$(SharedSourceRoot)PropertyAsParameterInfo.cs" LinkBase="Shared"/>
     <Compile Include="..\..\Shared\StreamCopyOperationInternal.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)RoutingMetadata\AcceptsMetadata.cs" LinkBase="Shared" />