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106 lines
3.3 KiB
106 lines
3.3 KiB
using System;
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using System.IO;
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using System.IO.Compression;
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using System.Linq;
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using Nancy;
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using Nancy.Bootstrapper;
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using NLog;
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using NzbDrone.Common.EnvironmentInfo;
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namespace Lidarr.Http.Extensions.Pipelines
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{
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public class GzipCompressionPipeline : IRegisterNancyPipeline
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{
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private readonly Logger _logger;
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public int Order => 0;
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private readonly Action<Action<Stream>, Stream> _writeGZipStream;
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public GzipCompressionPipeline(Logger logger)
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{
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_logger = logger;
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// On Mono GZipStream/DeflateStream leaks memory if an exception is thrown, use an intermediate buffer in that case.
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_writeGZipStream = PlatformInfo.IsMono ? WriteGZipStreamMono : (Action<Action<Stream>, Stream>)WriteGZipStream;
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}
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public void Register(IPipelines pipelines)
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{
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pipelines.AfterRequest.AddItemToEndOfPipeline(CompressResponse);
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}
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private void CompressResponse(NancyContext context)
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{
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var request = context.Request;
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var response = context.Response;
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try
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{
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if (
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response.Contents != Response.NoBody
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&& !response.ContentType.Contains("image")
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&& !response.ContentType.Contains("font")
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&& request.Headers.AcceptEncoding.Any(x => x.Contains("gzip"))
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&& !AlreadyGzipEncoded(response)
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&& !ContentLengthIsTooSmall(response))
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{
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var contents = response.Contents;
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response.Headers["Content-Encoding"] = "gzip";
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response.Contents = responseStream => _writeGZipStream(contents, responseStream);
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}
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}
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catch (Exception ex)
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{
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_logger.Error(ex, "Unable to gzip response");
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throw;
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}
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}
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private static void WriteGZipStreamMono(Action<Stream> innerContent, Stream targetStream)
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{
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using (var membuffer = new MemoryStream())
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{
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WriteGZipStream(innerContent, membuffer);
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membuffer.Position = 0;
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membuffer.CopyTo(targetStream);
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}
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}
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private static void WriteGZipStream(Action<Stream> innerContent, Stream targetStream)
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{
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using (var gzip = new GZipStream(targetStream, CompressionMode.Compress, true))
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using (var buffered = new BufferedStream(gzip, 8192))
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{
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innerContent.Invoke(buffered);
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}
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}
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private static bool ContentLengthIsTooSmall(Response response)
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{
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var contentLength = response.Headers.TryGetValue("Content-Length", out var value) ? value : null;
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if (contentLength != null && long.Parse(contentLength) < 1024)
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{
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return true;
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}
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return false;
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}
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private static bool AlreadyGzipEncoded(Response response)
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{
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var contentEncoding = response.Headers.TryGetValue("Content-Encoding", out var value) ? value : null;
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if (contentEncoding == "gzip")
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{
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return true;
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}
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return false;
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}
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}
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}
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