Add Request Decompression middleware

AspNetCore.sln

@@ -1658,6 +1658,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.AspNetCore.Compon
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.AspNetCore.Components.SdkAnalyzers.Tests", "src\Tools\SDK-Analyzers\Components\test\Microsoft.AspNetCore.Components.SdkAnalyzers.Tests.csproj", "{DC349A25-0DBF-4468-99E1-B95C22D3A7EF}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "RequestDecompression", "RequestDecompression", "{5465F96F-33D5-454E-9C40-494E58AEEE5D}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.RequestDecompression.Tests", "src\Middleware\RequestDecompression\test\Microsoft.AspNetCore.RequestDecompression.Tests.csproj", "{97996D39-7722-4AFC-A41A-AD61CA7A413D}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RequestDecompressionSample", "src\Middleware\RequestDecompression\sample\RequestDecompressionSample.csproj", "{37144E52-611B-40E8-807C-2821F5A814CB}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.RequestDecompression", "src\Middleware\RequestDecompression\src\Microsoft.AspNetCore.RequestDecompression.csproj", "{559FE354-7E08-4310-B4F3-AE30F34DEED5}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
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-		{F3F89B56-66A9-4EBC-8658-80785827237E}.Release|x86.ActiveCfg = Release|Any CPU
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@@ -9966,6 +9942,54 @@ Global
 		{DC349A25-0DBF-4468-99E1-B95C22D3A7EF}.Release|x64.Build.0 = Release|Any CPU
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 		{DC349A25-0DBF-4468-99E1-B95C22D3A7EF}.Release|x86.Build.0 = Release|Any CPU
+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Debug|arm64.Build.0 = Debug|Any CPU
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+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Debug|x64.Build.0 = Debug|Any CPU
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+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Debug|x86.Build.0 = Debug|Any CPU
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+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Release|x64.Build.0 = Release|Any CPU
+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Release|x86.ActiveCfg = Release|Any CPU
+		{97996D39-7722-4AFC-A41A-AD61CA7A413D}.Release|x86.Build.0 = Release|Any CPU
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+		{37144E52-611B-40E8-807C-2821F5A814CB}.Debug|arm64.Build.0 = Debug|Any CPU
+		{37144E52-611B-40E8-807C-2821F5A814CB}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{37144E52-611B-40E8-807C-2821F5A814CB}.Debug|x64.Build.0 = Debug|Any CPU
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+		{37144E52-611B-40E8-807C-2821F5A814CB}.Debug|x86.Build.0 = Debug|Any CPU
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+		{37144E52-611B-40E8-807C-2821F5A814CB}.Release|x64.Build.0 = Release|Any CPU
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+		{37144E52-611B-40E8-807C-2821F5A814CB}.Release|x86.Build.0 = Release|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Debug|arm64.Build.0 = Debug|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Debug|x64.Build.0 = Debug|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Debug|x86.Build.0 = Debug|Any CPU
+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Release|Any CPU.Build.0 = Release|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Release|arm64.Build.0 = Release|Any CPU
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+		{559FE354-7E08-4310-B4F3-AE30F34DEED5}.Release|x86.ActiveCfg = Release|Any CPU
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 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -10786,6 +10810,10 @@ Global
 		{CC45FA2D-128B-485D-BA6D-DFD9735CB3C3} = {6C06163A-80E9-49C1-817C-B391852BA563}
 		{825BCF97-67A9-4834-B3A8-C3DC97A90E41} = {CC45FA2D-128B-485D-BA6D-DFD9735CB3C3}
 		{DC349A25-0DBF-4468-99E1-B95C22D3A7EF} = {CC45FA2D-128B-485D-BA6D-DFD9735CB3C3}
+		{5465F96F-33D5-454E-9C40-494E58AEEE5D} = {E5963C9F-20A6-4385-B364-814D2581FADF}
+		{97996D39-7722-4AFC-A41A-AD61CA7A413D} = {5465F96F-33D5-454E-9C40-494E58AEEE5D}
+		{37144E52-611B-40E8-807C-2821F5A814CB} = {5465F96F-33D5-454E-9C40-494E58AEEE5D}
+		{559FE354-7E08-4310-B4F3-AE30F34DEED5} = {5465F96F-33D5-454E-9C40-494E58AEEE5D}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
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eng/ProjectReferences.props

@@ -89,6 +89,7 @@
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.Localization.Routing" ProjectPath="$(RepoRoot)src\Middleware\Localization.Routing\src\Microsoft.AspNetCore.Localization.Routing.csproj" />
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.Localization" ProjectPath="$(RepoRoot)src\Middleware\Localization\src\Microsoft.AspNetCore.Localization.csproj" />
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.MiddlewareAnalysis" ProjectPath="$(RepoRoot)src\Middleware\MiddlewareAnalysis\src\Microsoft.AspNetCore.MiddlewareAnalysis.csproj" />
+    <ProjectReferenceProvider Include="Microsoft.AspNetCore.RequestDecompression" ProjectPath="$(RepoRoot)src\Middleware\RequestDecompression\src\Microsoft.AspNetCore.RequestDecompression.csproj" />
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.ResponseCaching.Abstractions" ProjectPath="$(RepoRoot)src\Middleware\ResponseCaching.Abstractions\src\Microsoft.AspNetCore.ResponseCaching.Abstractions.csproj" />
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.ResponseCaching" ProjectPath="$(RepoRoot)src\Middleware\ResponseCaching\src\Microsoft.AspNetCore.ResponseCaching.csproj" />
     <ProjectReferenceProvider Include="Microsoft.AspNetCore.ResponseCompression" ProjectPath="$(RepoRoot)src\Middleware\ResponseCompression\src\Microsoft.AspNetCore.ResponseCompression.csproj" />

eng/SharedFramework.Local.props

@@ -77,6 +77,7 @@
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.HttpsPolicy" />
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.Localization.Routing" />
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.Localization" />
+    <AspNetCoreAppReference Include="Microsoft.AspNetCore.RequestDecompression" />
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.ResponseCaching.Abstractions" />
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.ResponseCaching" />
     <AspNetCoreAppReference Include="Microsoft.AspNetCore.ResponseCompression" />

src/Middleware/Middleware.slnf

@@ -76,6 +76,9 @@
       "src\\Middleware\\MiddlewareAnalysis\\samples\\MiddlewareAnalysisSample\\MiddlewareAnalysisSample.csproj",
       "src\\Middleware\\MiddlewareAnalysis\\src\\Microsoft.AspNetCore.MiddlewareAnalysis.csproj",
       "src\\Middleware\\MiddlewareAnalysis\\test\\Microsoft.AspNetCore.MiddlewareAnalysis.Tests.csproj",
+      "src\\Middleware\\RequestDecompression\\sample\\RequestDecompressionSample.csproj",
+      "src\\Middleware\\RequestDecompression\\src\\Microsoft.AspNetCore.RequestDecompression.csproj",
+      "src\\Middleware\\RequestDecompression\\test\\Microsoft.AspNetCore.RequestDecompression.Tests.csproj",
       "src\\Middleware\\ResponseCaching.Abstractions\\src\\Microsoft.AspNetCore.ResponseCaching.Abstractions.csproj",
       "src\\Middleware\\ResponseCaching\\samples\\ResponseCachingSample\\ResponseCachingSample.csproj",
       "src\\Middleware\\ResponseCaching\\src\\Microsoft.AspNetCore.ResponseCaching.csproj",
@@ -115,4 +118,4 @@
       "src\\Servers\\Kestrel\\Transport.Sockets\\src\\Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj"
     ]
   }
-}
+}

src/Middleware/RequestDecompression/sample/CustomDecompressionProvider.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.AspNetCore.RequestDecompression;
+
+namespace RequestDecompressionSample;
+
+public class CustomDecompressionProvider : IDecompressionProvider
+{
+    public string EncodingName => "custom";
+
+    public Stream CreateStream(Stream outputStream)
+    {
+        // Create a custom decompression stream wrapper here.
+        return outputStream;
+    }
+}

src/Middleware/RequestDecompression/sample/Properties/launchsettings.json

@@ -0,0 +1,27 @@
+{
+    "iisSettings": {
+      "windowsAuthentication": false,
+      "anonymousAuthentication": true,
+      "iisExpress": {
+        "applicationUrl": "http://localhost:6164/",
+        "sslPort": 0
+      }
+    },
+    "profiles": {
+      "RequestDecompressionSample": {
+        "commandName": "Project",
+        "launchBrowser": true,
+        "launchUrl": "http://localhost:5000/",
+        "environmentVariables": {
+          "ASPNETCORE_ENVIRONMENT": "Development"
+        }
+      },
+      "IIS Express": {
+        "commandName": "IISExpress",
+        "launchBrowser": true,
+        "environmentVariables": {
+          "ASPNETCORE_ENVIRONMENT": "Development"
+        }
+      }
+    }
+  }

src/Middleware/RequestDecompression/sample/RequestDecompressionSample.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="Microsoft.AspNetCore.RequestDecompression" />
+    <Reference Include="Microsoft.AspNetCore.Server.Kestrel" />
+    <Reference Include="Microsoft.Extensions.Logging.Console" />
+  </ItemGroup>
+
+</Project>

src/Middleware/RequestDecompression/sample/Startup.cs

@@ -0,0 +1,52 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.AspNetCore.RequestDecompression;
+
+namespace RequestDecompressionSample;
+
+public class Startup
+{
+    public void ConfigureServices(IServiceCollection services)
+    {
+        services.AddRequestDecompression(options =>
+        {
+            options.Providers.Add<GzipDecompressionProvider>();
+            options.Providers.Add<CustomDecompressionProvider>();
+        });
+    }
+
+    public void Configure(IApplicationBuilder app)
+    {
+        app.UseRequestDecompression();
+
+        app.Map("/test", testApp =>
+        {
+            testApp.Run(async context =>
+            {
+                using var reader = new StreamReader(context.Request.Body);
+                var decompressedBody = await reader.ReadToEndAsync(context.RequestAborted);
+
+                await context.Response.WriteAsync(decompressedBody, context.RequestAborted);
+            });
+        });
+    }
+
+    public static Task Main(string[] args)
+    {
+        var host = new HostBuilder()
+            .ConfigureWebHost(webHostBuilder =>
+            {
+                webHostBuilder
+                .UseKestrel()
+                .ConfigureLogging(factory =>
+                {
+                    factory.AddConsole()
+                    .SetMinimumLevel(LogLevel.Debug);
+                })
+                .UseStartup<Startup>();
+            }).Build();
+
+        return host.RunAsync();
+    }
+}

src/Middleware/RequestDecompression/src/BrotliDecompressionProvider.cs

@@ -0,0 +1,21 @@
+// 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.Compression;
+
+namespace Microsoft.AspNetCore.RequestDecompression;
+
+/// <summary>
+/// Brotli decompression provider.
+/// </summary>
+public class BrotliDecompressionProvider : IDecompressionProvider
+{
+    /// <inheritdoc />
+    public string EncodingName => "br";
+
+    /// <inheritdoc />
+    public Stream CreateStream(Stream outputStream)
+    {
+        return new BrotliStream(outputStream, CompressionMode.Decompress);
+    }
+}

src/Middleware/RequestDecompression/src/DecompressionProviderCollection.cs

@@ -0,0 +1,46 @@
+// 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.ObjectModel;
+
+namespace Microsoft.AspNetCore.RequestDecompression;
+
+/// <summary>
+/// A collection of <see cref="IDecompressionProvider"/>'s that also allows them to instantiated from an <see cref="IServiceProvider"/>.
+/// </summary>
+public class DecompressionProviderCollection : Collection<IDecompressionProvider>
+{
+    /// <summary>
+    /// Adds a type representing an <see cref="IDecompressionProvider"/>.
+    /// </summary>
+    /// <remarks>
+    /// Provider instances will be created using an <see cref="IServiceProvider"/>.
+    /// </remarks>
+    public void Add<TDecompressionProvider>() where TDecompressionProvider : IDecompressionProvider
+    {
+        Add(typeof(TDecompressionProvider));
+    }
+
+    /// <summary>
+    /// Adds a type representing a <see cref="IDecompressionProvider"/>.
+    /// </summary>
+    /// <param name="providerType">Type representing an <see cref="IDecompressionProvider"/>.</param>
+    /// <remarks>
+    /// Provider instance will be created using an <see cref="IServiceProvider"/>.
+    /// </remarks>
+    public void Add(Type providerType)
+    {
+        if (providerType == null)
+        {
+            throw new ArgumentNullException(nameof(providerType));
+        }
+
+        if (!typeof(IDecompressionProvider).IsAssignableFrom(providerType))
+        {
+            throw new ArgumentException($"The provider must implement {nameof(IDecompressionProvider)}.", nameof(providerType));
+        }
+
+        var factory = new DecompressionProviderFactory(providerType);
+        Add(factory);
+    }
+}

src/Middleware/RequestDecompression/src/DecompressionProviderFactory.cs

@@ -0,0 +1,40 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Microsoft.AspNetCore.RequestDecompression;
+
+/// <summary>
+/// This is a placeholder for the <see cref="DecompressionProviderCollection"/> that allows
+/// the creation of the given type via an <see cref="IServiceProvider"/>.
+/// </summary>
+internal class DecompressionProviderFactory : IDecompressionProvider
+{
+    public DecompressionProviderFactory(Type providerType)
+    {
+        ProviderType = providerType;
+    }
+
+    private Type ProviderType { get; }
+
+    public IDecompressionProvider CreateInstance(IServiceProvider serviceProvider)
+    {
+        if (serviceProvider == null)
+        {
+            throw new ArgumentNullException(nameof(serviceProvider));
+        }
+
+        return (IDecompressionProvider)ActivatorUtilities.CreateInstance(serviceProvider, ProviderType, Type.EmptyTypes);
+    }
+
+    string IDecompressionProvider.EncodingName
+    {
+        get { throw new NotSupportedException(); }
+    }
+
+    Stream IDecompressionProvider.CreateStream(Stream outputStream)
+    {
+        throw new NotSupportedException();
+    }
+}

src/Middleware/RequestDecompression/src/DeflateDecompressionProvider.cs

@@ -0,0 +1,21 @@
+// 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.Compression;
+
+namespace Microsoft.AspNetCore.RequestDecompression;
+
+/// <summary>
+/// DEFLATE decompression provider.
+/// </summary>
+public class DeflateDecompressionProvider : IDecompressionProvider
+{
+    /// <inheritdoc />
+    public string EncodingName => "deflate";
+
+    /// <inheritdoc />
+    public Stream CreateStream(Stream outputStream)
+    {
+        return new DeflateStream(outputStream, CompressionMode.Decompress);
+    }
+}