Fix generation of SourceKey path in RDG (#48017)

* Reproduce bug in CI

* Change how SourceKey path is derived

* Remove RequiresDynamicCode attribute on MapIdentityApi

eng/TrimmableProjects.props

@@ -32,6 +32,7 @@
     <TrimmableProject Include="Microsoft.AspNetCore.Routing" />
     <TrimmableProject Include="Microsoft.AspNetCore.WebUtilities" />
     <TrimmableProject Include="Microsoft.AspNetCore.Html.Abstractions" />
+    <TrimmableProject Include="Microsoft.AspNetCore.Identity" />
     <TrimmableProject Include="Microsoft.Extensions.Identity.Core" />
     <TrimmableProject Include="Microsoft.Extensions.Identity.Stores" />
     <TrimmableProject Include="Microsoft.AspNetCore.Connections.Abstractions" />

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

@@ -27,6 +27,7 @@
     <Compile Include="$(SharedSourceRoot)RoslynUtils\WellKnownTypeData.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)RoslynUtils\WellKnownTypes.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)RoslynUtils\SymbolExtensions.cs" LinkBase="Shared" />
+    <Compile Include="$(SharedSourceRoot)RoslynUtils\SyntaxTreeExtensions.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)RoslynUtils\ParsabilityHelper.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)RoslynUtils\CodeWriter.cs" LinkBase="Shared" />
   </ItemGroup>

src/Http/Http.Extensions/gen/StaticRouteHandlerModel/Endpoint.cs

@@ -163,8 +163,9 @@ internal class Endpoint
 
     private static (string, int) GetLocation(IInvocationOperation operation)
     {
-        var filePath = operation.Syntax.SyntaxTree.FilePath;
-        var span = operation.Syntax.SyntaxTree.GetLineSpan(operation.Syntax.Span);
+        var operationSpan = operation.Syntax.Span;
+        var filePath = operation.Syntax.SyntaxTree.GetDisplayPath(operationSpan, operation.SemanticModel?.Compilation.Options.SourceReferenceResolver);
+        var span = operation.Syntax.SyntaxTree.GetLineSpan(operationSpan);
         var lineNumber = span.StartLinePosition.Line + 1;
         return (filePath, lineNumber);
     }

src/Identity/Core/src/IdentityApiEndpointRouteBuilderExtensions.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Microsoft.AspNetCore.Authentication.BearerToken.DTO;
 using Microsoft.AspNetCore.Builder;
@@ -28,8 +27,6 @@ public static class IdentityApiEndpointRouteBuilderExtensions
     /// Call <see cref="EndpointRouteBuilderExtensions.MapGroup(IEndpointRouteBuilder, string)"/> to add a prefix to all the endpoints.
     /// </param>
     /// <returns>An <see cref="IEndpointConventionBuilder"/> to further customize the added endpoints.</returns>
-    // TODO: Remove RequiresDynamicCode when https://github.com/dotnet/aspnetcore/issues/47918 is fixed and RDG is enabled.
-    [RequiresDynamicCode("This API requires generated code that is not compatible with native AOT applications.")]
     public static IEndpointConventionBuilder MapIdentityApi<TUser>(this IEndpointRouteBuilder endpoints) where TUser : class, new()
     {
         ArgumentNullException.ThrowIfNull(endpoints);

src/Identity/Core/src/Microsoft.AspNetCore.Identity.csproj

@@ -7,8 +7,8 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;identity;membership</PackageTags>
     <IsPackable>false</IsPackable>
-    <!-- TODO: Re-enable trimming once https://github.com/dotnet/aspnetcore/issues/47918 is fixed and RDG is enabled. -->
-    <!--<IsTrimmable>true</IsTrimmable>-->
+    <IsTrimmable>true</IsTrimmable>
+    <EnableRequestDelegateGenerator>true</EnableRequestDelegateGenerator>
   </PropertyGroup>
 
   <ItemGroup>
@@ -31,7 +31,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <!-- TODO: Re-enable RDG once https://github.com/dotnet/aspnetcore/issues/47918 is fixed. -->
-    <!--<ProjectReference Include="$(RepoRoot)/src/Http/Http.Extensions/gen/Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />-->
+    <ProjectReference Include="$(RepoRoot)/src/Http/Http.Extensions/gen/Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>
 </Project>

src/Shared/RoslynUtils/SyntaxTreeExtensions.cs

@@ -0,0 +1,23 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+
+internal static class SyntaxTreeExtensions
+{
+    // Utilize the same logic used by the `CallerLinePathAttribute` for generating
+    // a file path for a given syntax tree.
+    // Source copied from https://github.com/dotnet/roslyn/blob/5b47c7fe326faa35940f220c14f718cd0b820c38/src/Compilers/Core/Portable/Syntax/SyntaxTree.cs#L274-L293 until
+    // public APIs are available.
+    internal static string GetDisplayPath(this SyntaxTree tree, TextSpan span, SourceReferenceResolver? resolver)
+    {
+        var mappedSpan = tree.GetMappedLineSpan(span);
+        if (resolver == null || mappedSpan.Path.Length == 0)
+        {
+            return mappedSpan.Path;
+        }
+
+        return resolver.NormalizePath(mappedSpan.Path, baseFilePath: mappedSpan.HasMappedPath ? tree.FilePath : null) ?? mappedSpan.Path;
+    }
+}