Backport pull request #15681 from jellyfin/release-10.11.z

Fix symlinked file size

Original-merge: d32f487e8e4762bba740b586285b663712eda69a

Merged-by: crobibero <cody@robibe.ro>

Backported-by: Bond_009 <bond.009@outlook.com>

Jellyfin.Api/Controllers/LibraryController.cs

@@ -23,6 +23,7 @@ using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Audio;
 using MediaBrowser.Controller.Entities.Movies;
 using MediaBrowser.Controller.Entities.TV;
+using MediaBrowser.Controller.IO;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Activity;
@@ -700,7 +701,18 @@ public class LibraryController : BaseJellyfinApiController
         // Quotes are valid in linux. They'll possibly cause issues here.
         var filename = Path.GetFileName(item.Path)?.Replace("\"", string.Empty, StringComparison.Ordinal);
 
-        return PhysicalFile(item.Path, MimeTypes.GetMimeType(item.Path), filename, true);
+        var filePath = item.Path;
+        if (item.IsFileProtocol)
+        {
+            // PhysicalFile does not work well with symlinks at the moment.
+            var resolved = FileSystemHelper.ResolveLinkTarget(filePath, returnFinalTarget: true);
+            if (resolved is not null && resolved.Exists)
+            {
+                filePath = resolved.FullName;
+            }
+        }
+
+        return PhysicalFile(filePath, MimeTypes.GetMimeType(filePath), filename, true);
     }
 
     /// <summary>