Add initial validations generator for minimal APIs

Author: captainsafia

AspNetCore.sln

@@ -1732,7 +1732,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Server
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Server.Kestrel.Transport.NamedPipes.Tests", "src\Servers\Kestrel\Transport.NamedPipes\test\Microsoft.AspNetCore.Server.Kestrel.Transport.NamedPipes.Tests.csproj", "{97C7D2A4-87E5-4A4A-A170-D736427D5C21}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Http.RequestDelegateGenerator", "src\Http\Http.Extensions\gen\Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj", "{4730F56D-24EF-4BB2-AA75-862E31205F3A}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Http.RequestDelegateGenerator", "src\Http\Http.Extensions\gen\RequestDelegateGenerator\Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj", "{4730F56D-24EF-4BB2-AA75-862E31205F3A}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "QuickGrid", "QuickGrid", "{C406D9E0-1585-43F9-AA8F-D468AF84A996}"
 EndProject
@@ -1812,6 +1812,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Assets", "Assets", "{2B858B
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.AspNetCore.App.Internal.Assets", "src\Assets\Microsoft.AspNetCore.App.Internal.Assets.csproj", "{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.AspNetCore.Http.ValidationsGenerator", "src\Http\Http.Extensions\gen\ValidationsGenerator\Microsoft.AspNetCore.Http.ValidationsGenerator.csproj", "{185D74AB-76CE-44C1-86EB-16E93C84033F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -10943,22 +10945,38 @@ Global
 		{C3928C15-1836-46DB-A09D-9EFBCCA33E08}.Release|x64.Build.0 = Release|Any CPU
 		{C3928C15-1836-46DB-A09D-9EFBCCA33E08}.Release|x86.ActiveCfg = Release|Any CPU
 		{C3928C15-1836-46DB-A09D-9EFBCCA33E08}.Release|x86.Build.0 = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|arm64.ActiveCfg = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|arm64.Build.0 = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|x64.ActiveCfg = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|x64.Build.0 = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|x86.ActiveCfg = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Debug|x86.Build.0 = Debug|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|Any CPU.Build.0 = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|arm64.ActiveCfg = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|arm64.Build.0 = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|x64.ActiveCfg = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|x64.Build.0 = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|x86.ActiveCfg = Release|Any CPU
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62}.Release|x86.Build.0 = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|arm64.ActiveCfg = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|arm64.Build.0 = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|x64.Build.0 = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Debug|x86.Build.0 = Debug|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|arm64.ActiveCfg = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|arm64.Build.0 = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|x64.ActiveCfg = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|x64.Build.0 = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|x86.ActiveCfg = Release|Any CPU
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11}.Release|x86.Build.0 = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|arm64.ActiveCfg = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|arm64.Build.0 = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|x64.Build.0 = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Debug|x86.Build.0 = Debug|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|arm64.ActiveCfg = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|arm64.Build.0 = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|x64.ActiveCfg = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|x64.Build.0 = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|x86.ActiveCfg = Release|Any CPU
+		{185D74AB-76CE-44C1-86EB-16E93C84033F}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -11853,8 +11871,9 @@ Global
 		{B32FF7A7-9CB3-4DCD-AE97-3B2594DB9DAC} = {2299CCD8-8F9C-4F2B-A633-9BF4DA81022B}
 		{B9BBC1A8-7F58-4F43-94C3-5F3CB125CEF7} = {B32FF7A7-9CB3-4DCD-AE97-3B2594DB9DAC}
 		{C3928C15-1836-46DB-A09D-9EFBCCA33E08} = {B5D98AEB-9409-4280-8225-9C1EC6A791B2}
-		{2B858B82-5F0B-4A24-B3C0-5E99149F70D6} = {017429CC-C5FB-48B4-9C46-034E29EE2F06}
-		{2AAE7819-BC3E-48F4-9CFA-5DD4CD5FFD62} = {2B858B82-5F0B-4A24-B3C0-5E99149F70D6}
+		{18A3AF88-D633-44E6-9407-3B2C708F7F64} = {225AEDCF-7162-4A86-AC74-06B84660B379}
+		{FB45AD76-D348-4F96-A8EE-71F61DC6DA11} = {18A3AF88-D633-44E6-9407-3B2C708F7F64}
+		{185D74AB-76CE-44C1-86EB-16E93C84033F} = {18A3AF88-D633-44E6-9407-3B2C708F7F64}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {3E8720B3-DBDD-498C-B383-2CC32A054E8F}

eng/Dependencies.props

@@ -224,6 +224,7 @@ and are generated based on the last package release.
     <LatestPackageReference Include="Swashbuckle.AspNetCore" />
     <LatestPackageReference Include="System.Reactive.Linq" />
     <LatestPackageReference Include="Verify.Xunit" />
+    <LatestPackageReference Include="Verify.SourceGenerators" />
     <LatestPackageReference Include="xunit.abstractions" />
     <LatestPackageReference Include="xunit.analyzers" />
     <LatestPackageReference Include="xunit.assert" />

eng/Versions.props

@@ -327,6 +327,7 @@
     <SystemReactiveLinqVersion>5.0.0</SystemReactiveLinqVersion>
     <SwashbuckleAspNetCoreVersion>6.6.2</SwashbuckleAspNetCoreVersion>
     <VerifyXunitVersion>19.14.0</VerifyXunitVersion>
+    <VerifySourceGeneratorsVersion>2.2.0</VerifySourceGeneratorsVersion>
     <XunitAbstractionsVersion>2.0.3</XunitAbstractionsVersion>
     <XunitAnalyzersVersion>1.15.0</XunitAnalyzersVersion>
     <XunitVersion>2.9.2</XunitVersion>

eng/testing/linker/SupportFiles/Directory.Build.targets

@@ -76,7 +76,7 @@
     <ProjectReference Include="$(RepoRoot)src\SignalR\clients\csharp\Client\src\Microsoft.AspNetCore.SignalR.Client.csproj" />
     <ProjectReference Include="$(RepoRoot)src\SignalR\server\SignalR\src\Microsoft.AspNetCore.SignalR.csproj" />
     <ProjectReference Include="$(RepoRoot)src\OpenApi\src\Microsoft.AspNetCore.OpenApi.csproj" />
-    <ProjectReference Include="$(RepoRoot)src\Http\Http.Extensions\gen\Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+    <ProjectReference Include="$(RepoRoot)src\Http\Http.Extensions\gen\RequestDelegateGenerator\Microsoft.AspNetCore.Http.RequestDelegateGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>
 
 </Project>

src/DefaultBuilder/src/PublicAPI.Unshipped.txt

@@ -1 +1,2 @@
 #nullable enable
+Microsoft.AspNetCore.Builder.WebApplication.Conventions.get -> Microsoft.AspNetCore.Builder.IEndpointConventionBuilder!

src/DefaultBuilder/src/WebApplication.cs

@@ -27,15 +27,18 @@ public sealed class WebApplication : IHost, IApplicationBuilder, IEndpointRouteB
     internal const string GlobalEndpointRouteBuilderKey = "__GlobalEndpointRouteBuilder";
 
     private readonly IHost _host;
-    private readonly List<EndpointDataSource> _dataSources = new();
+    private readonly GlobalEndpointRouteBuilder _innerBuilder;
+    private readonly RouteGroupBuilder _globalRouteGroup;
 
     internal WebApplication(IHost host)
     {
         _host = host;
+        _innerBuilder = new(this);
+        _globalRouteGroup = _innerBuilder.MapGroup("");
         ApplicationBuilder = new ApplicationBuilder(host.Services, ServerFeatures);
         Logger = host.Services.GetRequiredService<ILoggerFactory>().CreateLogger(Environment.ApplicationName ?? nameof(WebApplication));
 
-        Properties[GlobalEndpointRouteBuilderKey] = this;
+        Properties[GlobalEndpointRouteBuilderKey] = _innerBuilder;
     }
 
     /// <summary>
@@ -80,9 +83,14 @@ IServiceProvider IApplicationBuilder.ApplicationServices
     internal IDictionary<string, object?> Properties => ApplicationBuilder.Properties;
     IDictionary<string, object?> IApplicationBuilder.Properties => Properties;
 
-    internal ICollection<EndpointDataSource> DataSources => _dataSources;
+    internal ICollection<EndpointDataSource> DataSources => ((IEndpointRouteBuilder)_globalRouteGroup).DataSources;
     ICollection<EndpointDataSource> IEndpointRouteBuilder.DataSources => DataSources;
 
+    /// <summary>
+    /// Gets the <see cref="IEndpointConventionBuilder"/> for the application.
+    /// </summary>
+    public IEndpointConventionBuilder Conventions => _globalRouteGroup;
+
     internal ApplicationBuilder ApplicationBuilder { get; }
 
     IServiceProvider IEndpointRouteBuilder.ServiceProvider => Services;
@@ -307,4 +315,13 @@ public IList<string>? Middleware
             }
         }
     }
+
+    private class GlobalEndpointRouteBuilder(WebApplication application) : IEndpointRouteBuilder
+    {
+        public IServiceProvider ServiceProvider => application.Services;
+
+        public ICollection<EndpointDataSource> DataSources { get; } = [];
+
+        public IApplicationBuilder CreateApplicationBuilder() => application;
+    }
 }

src/DefaultBuilder/src/WebApplicationBuilder.cs

@@ -408,7 +408,7 @@ private void ConfigureApplication(WebHostBuilderContext context, IApplicationBui
         // destination.UseEndpoints()
 
         // Set the route builder so that UseRouting will use the WebApplication as the IEndpointRouteBuilder for route matching
-        app.Properties.Add(WebApplication.GlobalEndpointRouteBuilderKey, _builtApplication);
+        app.Properties.Add(WebApplication.GlobalEndpointRouteBuilderKey, _builtApplication.Properties[WebApplication.GlobalEndpointRouteBuilderKey]);
 
         // Only call UseRouting() if there are endpoints configured and UseRouting() wasn't called on the global route builder already
         if (_builtApplication.DataSources.Count > 0)

src/Http/Http.Extensions/gen/DiagnosticDescriptors.cs src/Http/Http.Extensions/gen/RequestDelegateGenerator/DiagnosticDescriptors.cs

@@ -0,0 +1,49 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Immutable;
+using System.IO;
+using Microsoft.CodeAnalysis;
+
+namespace Microsoft.AspNetCore.Http.ValidationsGenerator;
+
+public sealed partial class ValidationsGenerator
+{
+    internal static void EmitValidationsFile(SourceProductionContext context, ((string Left, string Right) Left, ImmutableArray<string> Right) source)
+    {
+        var withValidations = source.Left.Left;
+        var typeValidations = source.Left.Right;
+        var validationsFilters = source.Right;
+        var writer = new StringWriter();
+        var output = new CodeWriter(writer, baseIndent: 0);
+        output.WriteLine("// <auto-generated/>");
+        output.WriteLine("#nullable enable");
+        output.WriteLine("namespace System.Runtime.CompilerServices");
+        output.StartBlock();
+        output.WriteLine("[AttributeUsage(System.AttributeTargets.Method, AllowMultiple = true)]");
+        output.WriteLine("file sealed class InterceptsLocationAttribute : Attribute");
+        output.StartBlock();
+        output.WriteLine("public InterceptsLocationAttribute(int version, string data) { }");
+        output.EndBlock();
+        output.EndBlock();
+        output.WriteLine();
+        output.WriteLine("namespace Microsoft.AspNetCore.Http.Validations.Generated");
+        output.StartBlock();
+        output.WriteLine("using System;");
+        output.WriteLine("using System.Linq;");
+        output.WriteLine("using System.Diagnostics;");
+        output.WriteLine("using System.ComponentModel.DataAnnotations;");
+        output.WriteLine();
+        output.Indent--;
+        output.WriteLine(EmitEndpointKey());
+        output.WriteLine(EmitValidationProblemBuilder());
+        output.WriteLine(withValidations);
+        output.WriteLine();
+        output.WriteLine(typeValidations);
+        output.WriteLine();
+        output.Write(EmitEndpointValidationFilters(validationsFilters));
+        output.WriteLine("}");
+        output.WriteLine("#nullable restore");
+        context.AddSource("RouteHandlerValidations.g.cs", writer.ToString());
+    }
+}

src/Http/Http.Extensions/gen/GeneratorSteps.cs src/Http/Http.Extensions/gen/RequestDelegateGenerator/GeneratorSteps.cs

@@ -0,0 +1,53 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.IO;
+
+namespace Microsoft.AspNetCore.Http.ValidationsGenerator;
+
+public sealed partial class ValidationsGenerator
+{
+    internal static string EmitEndpointKey()
+    {
+        var writer = new StringWriter();
+        var code = new CodeWriter(writer, baseIndent: 1);
+        code.WriteLine("file class EndpointKey(string route, global::System.Collections.Generic.IEnumerable<string> methods)");
+        code.StartBlock();
+        code.WriteLine("public string Route { get; } = route;");
+        code.WriteLine("public global::System.Collections.Generic.IEnumerable<string> Methods { get; } = methods;");
+        code.WriteLine();
+        code.WriteLine("public override bool Equals(object? obj)");
+        code.StartBlock();
+        code.WriteLine("if (obj is EndpointKey other)");
+        code.StartBlock();
+        code.WriteLine("return string.Equals(Route, other.Route, global::System.StringComparison.OrdinalIgnoreCase) &&");
+        code.WriteLine("Methods.SequenceEqual(other.Methods, global::System.StringComparer.OrdinalIgnoreCase);");
+        code.EndBlock();
+        code.WriteLine("return false;");
+        code.EndBlock();
+        code.WriteLine();
+        code.WriteLine("public override int GetHashCode()");
+        code.StartBlock();
+        code.WriteLine("int hash = 17;");
+        code.WriteLine("hash = hash * 23 + (Route?.GetHashCode(global::System.StringComparison.OrdinalIgnoreCase) ?? 0);");
+        code.WriteLine("hash = hash * 23 + GetMethodsHashCode(Methods);");
+        code.WriteLine("return hash;");
+        code.EndBlock();
+        code.WriteLine();
+        code.WriteLine("private static int GetMethodsHashCode(global::System.Collections.Generic.IEnumerable<string> methods)");
+        code.StartBlock();
+        code.WriteLine("if (methods == null)");
+        code.StartBlock();
+        code.WriteLine("return 0;");
+        code.EndBlock();
+        code.WriteLine("int hash = 17;");
+        code.WriteLine("foreach (var method in methods)");
+        code.StartBlock();
+        code.WriteLine("hash = hash * 23 + (method?.GetHashCode(global::System.StringComparison.OrdinalIgnoreCase) ?? 0);");
+        code.EndBlock();
+        code.WriteLine("return hash;");
+        code.EndBlock();
+        code.EndBlock();
+        return writer.ToString();
+    }
+}