Attachment service.

MediaBrowser.Api/Attachments/AttachmentService.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.MediaEncoding;
+using MediaBrowser.Controller.Net;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.IO;
+using MediaBrowser.Model.Providers;
+using MediaBrowser.Model.Services;
+using Microsoft.Extensions.Logging;
+using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
+
+namespace MediaBrowser.Api.Attachments
+{
+    [Route("/Videos/{Id}/{MediaSourceId}/Attachments/{Index}/Attachment", "GET", Summary = "Gets specified attachment.")]
+    public class GetAttachment
+    {
+        [ApiMember(Name = "Id", Description = "Item Id", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "GET")]
+        public Guid Id { get; set; }
+
+        [ApiMember(Name = "MediaSourceId", Description = "MediaSourceId", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "GET")]
+        public string MediaSourceId { get; set; }
+
+        [ApiMember(Name = "Index", Description = "The attachment stream index", IsRequired = true, DataType = "int", ParameterType = "path", Verb = "GET")]
+        public int Index { get; set; }
+    }
+
+    public class AttachmentService : BaseApiService
+    {
+        private readonly ILibraryManager _libraryManager;
+        private readonly IAttachmentExtractor _attachmentExtractor;
+
+        public AttachmentService(ILibraryManager libraryManager, IAttachmentExtractor attachmentExtractor)
+        {
+            _libraryManager = libraryManager;
+            _attachmentExtractor = attachmentExtractor;
+        }
+
+        public async Task<object> Get(GetAttachment request)
+        {
+            var item = (Video)_libraryManager.GetItemById(request.Id);
+	    var (attachment, attachmentStream) = await GetAttachment(request).ConfigureAwait(false);
+	    var mime = string.IsNullOrWhiteSpace(attachment.MIMEType) ? "application/octet-stream" : attachment.MIMEType;
+
+            return ResultFactory.GetResult(Request, attachmentStream, mime);
+        }
+
+        private Task<(MediaAttachment, Stream)> GetAttachment(GetAttachment request)
+        {
+            var item = _libraryManager.GetItemById(request.Id);
+
+            return _attachmentExtractor.GetAttachment(item,
+                request.MediaSourceId,
+                request.Index,
+                CancellationToken.None);
+        }
+
+    }
+}