1 files changed, 136 insertions, 0 deletions
diff --git a/Jellyfin.Api/Helpers/FileStreamResponseHelpers.cs b/Jellyfin.Api/Helpers/FileStreamResponseHelpers.cs
new file mode 100644
index 000000000..6b516977e
--- /dev/null
+++ b/Jellyfin.Api/Helpers/FileStreamResponseHelpers.cs
@@ -0,0 +1,136 @@
+using System;
+using System.IO;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using Jellyfin.Api.Models.PlaybackDtos;
+using Jellyfin.Api.Models.StreamingDtos;
+using MediaBrowser.Controller.MediaEncoding;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Net.Http.Headers;
+
+namespace Jellyfin.Api.Helpers
+{
+    /// <summary>
+    /// The stream response helpers.
+    /// </summary>
+    public static class FileStreamResponseHelpers
+    {
+        /// <summary>
+        /// Returns a static file from a remote source.
+        /// </summary>
+        /// <param name="state">The current <see cref="StreamState"/>.</param>
+        /// <param name="isHeadRequest">Whether the current request is a HTTP HEAD request so only the headers get returned.</param>
+        /// <param name="httpClient">The <see cref="HttpClient"/> making the remote request.</param>
+        /// <param name="httpContext">The current http context.</param>
+        /// <returns>A <see cref="Task{ActionResult}"/> containing the API response.</returns>
+        public static async Task<ActionResult> GetStaticRemoteStreamResult(
+            StreamState state,
+            bool isHeadRequest,
+            HttpClient httpClient,
+            HttpContext httpContext)
+        {
+            if (state.RemoteHttpHeaders.TryGetValue(HeaderNames.UserAgent, out var useragent))
+            {
+                httpClient.DefaultRequestHeaders.Add(HeaderNames.UserAgent, useragent);
+            }
+
+            // Can't dispose the response as it's required up the call chain.
+            var response = await httpClient.GetAsync(state.MediaPath).ConfigureAwait(false);
+            var contentType = response.Content.Headers.ContentType.ToString();
+
+            httpContext.Response.Headers[HeaderNames.AcceptRanges] = "none";
+
+            if (isHeadRequest)
+            {
+                return new FileContentResult(Array.Empty<byte>(), contentType);
+            }
+
+            return new FileStreamResult(await response.Content.ReadAsStreamAsync().ConfigureAwait(false), contentType);
+        }
+
+        /// <summary>
+        /// Returns a static file from the server.
+        /// </summary>
+        /// <param name="path">The path to the file.</param>
+        /// <param name="contentType">The content type of the file.</param>
+        /// <param name="isHeadRequest">Whether the current request is a HTTP HEAD request so only the headers get returned.</param>
+        /// <param name="httpContext">The current http context.</param>
+        /// <returns>An <see cref="ActionResult"/> the file.</returns>
+        public static ActionResult GetStaticFileResult(
+            string path,
+            string contentType,
+            bool isHeadRequest,
+            HttpContext httpContext)
+        {
+            httpContext.Response.ContentType = contentType;
+
+            // if the request is a head request, return a NoContent result with the same headers as it would with a GET request
+            if (isHeadRequest)
+            {
+                return new NoContentResult();
+            }
+
+            return new PhysicalFileResult(path, contentType) { EnableRangeProcessing = true };
+        }
+
+        /// <summary>
+        /// Returns a transcoded file from the server.
+        /// </summary>
+        /// <param name="state">The current <see cref="StreamState"/>.</param>
+        /// <param name="isHeadRequest">Whether the current request is a HTTP HEAD request so only the headers get returned.</param>
+        /// <param name="httpContext">The current http context.</param>
+        /// <param name="transcodingJobHelper">The <see cref="TranscodingJobHelper"/> singleton.</param>
+        /// <param name="ffmpegCommandLineArguments">The command line arguments to start ffmpeg.</param>
+        /// <param name="transcodingJobType">The <see cref="TranscodingJobType"/>.</param>
+        /// <param name="cancellationTokenSource">The <see cref="CancellationTokenSource"/>.</param>
+        /// <returns>A <see cref="Task{ActionResult}"/> containing the transcoded file.</returns>
+        public static async Task<ActionResult> GetTranscodedFile(
+            StreamState state,
+            bool isHeadRequest,
+            HttpContext httpContext,
+            TranscodingJobHelper transcodingJobHelper,
+            string ffmpegCommandLineArguments,
+            TranscodingJobType transcodingJobType,
+            CancellationTokenSource cancellationTokenSource)
+        {
+            // Use the command line args with a dummy playlist path
+            var outputPath = state.OutputFilePath;
+
+            httpContext.Response.Headers[HeaderNames.AcceptRanges] = "none";
+
+            var contentType = state.GetMimeType(outputPath);
+
+            // Headers only
+            if (isHeadRequest)
+            {
+                return new FileContentResult(Array.Empty<byte>(), contentType);
+            }
+
+            var transcodingLock = transcodingJobHelper.GetTranscodingLock(outputPath);
+            await transcodingLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
+            try
+            {
+                TranscodingJobDto? job;
+                if (!File.Exists(outputPath))
+                {
+                    job = await transcodingJobHelper.StartFfMpeg(state, outputPath, ffmpegCommandLineArguments, httpContext.Request, transcodingJobType, cancellationTokenSource).ConfigureAwait(false);
+                }
+                else
+                {
+                    job = transcodingJobHelper.OnTranscodeBeginRequest(outputPath, TranscodingJobType.Progressive);
+                    state.Dispose();
+                }
+
+                await new ProgressiveFileCopier(outputPath, job, transcodingJobHelper, CancellationToken.None)
+                    .WriteToAsync(httpContext.Response.Body, CancellationToken.None).ConfigureAwait(false);
+                return new FileStreamResult(httpContext.Response.Body, contentType);
+            }
+            finally
+            {
+                transcodingLock.Release();
+            }
+        }
+    }
+}