RequestDecompression middleware

[sebastienros]

The same way we have a ResponseCompression middleware we should have a RequestDecompression one that automatically decompress the requests containing Content-Encoding with supported formats (gzip, deflate, brotli, ...). Based on the same extensible compression factories.

Scenario: a client sends files to a server using gzip compressed streams. The developer of the server application doesn't have to care about how to decrompress the body.

[Tratcher]

Prior ask: #30544

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[david-acker]

I'd be interested in helping out with this. This should follow the same pattern that the ResponseCompression middleware uses, correct? (i.e., an IDecompressionProvider interface that's implemented by the -DecompressionProvider classes for each of the supported formats)

[sebastienros]

@david-acker I think it should do the same thing, yes. Go for it! Since nobody would do it for now. I would use it then instead of doing it my controllers: https://github.com/dotnet/crank/blob/main/src/Microsoft.Crank.Agent/Controllers/JobsController.cs#L389

[alexanderkozlenko]

I would be glad to offer my help as well if needed: I've been using my own middleware implementation for a few years:

• GitHub: https://github.com/alexanderkozlenko/aspnetcore-request-decompression
• NuGet: https://www.nuget.org/packages/Anemonis.AspNetCore.RequestDecompression

[david-acker]

@sebastienros From a practical perspective, does it make sense to support decompressing requests that have multiple Content-Encodings applied (e.g. compressed with Brotli and then GZip)? I'd be happy to add this if you think it's worthwhile, but I just wanted to confirm first.

I'll put a draft PR with the working implementation soon so I can get some feedback.

[Tratcher]

From a practical perspective, does it make sense to support decompressing requests that have multiple Content-Encodings applied (e.g. compressed with Brotli and then GZip)? I'd be happy to add this if you think it's worthwhile, but I just wanted to confirm first.

Is that something people actually do? They'd get minimal returns on the second pass.

We don't support this on response compression. I wouldn't worry about it for the first implementation.

[david-acker]

That was my thought as well. I saw this mentioned in RFC 2616 and a few other places online (not with any examples of actual implementations though), but I figured I'd ask just to be sure.

[pranavkm]

API Review:

namespace Microsoft.AspNetCore.Http.Metadata;
+ public interface IRequestSizeLimitMetadata
+ {
+     public long MaxRequestBodySize { get; }
+ }

+ namespace Microsoft.AspNetCore.RequestDecompression;
+ public interface IDecompressionProvider
+ {
+     Stream GetDecompressionStream(Stream stream);
+ }

+ public interface IRequestDecompressionProvider
+ {
+     IDecompressionProvider? GetDecompressionProvider(HttpContext context);
+ }

+ public sealed class RequestDecompressionOptions
+ {
+     public IDictionary<string, IDecompressionProvider> DecompressionProviders { get; }
+ }
 
namespace Microsoft.AspNetCore.Builder;

+ public static class RequestDecompressionBuilderExtensions
+ {
+     public static IApplicationBuilder UseRequestDecompression(this IApplicationBuilder builder);
+ }

namespace Microsoft.Extensions.DependencyInjection;

+ public static class RequestDecompressionServiceExtensions
+ {
+     public static IServiceCollection AddRequestDecompression(this IServiceCollection services);
+     public static IServiceCollection AddRequestDecompression(this IServiceCollection services, Action<RequestDecompressionOptions> configureOptions);
+ }

namespace Microsoft.AspNetCore.Mvc;

- public class RequestSizeLimitAttribute : Attribute, IFilterFactory, IOrderedFilter
+ public class RequestSizeLimitAttribute : Attribute, IFilterFactory, IOrderedFilter, IRequestSizeLimitMetadata

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