Cleanup extracted files (#13760)

* Cleanup extracted files

* Pagination and fixes

* Add migration for attachments to MigrateLibraryDb

* Unify attachment handling

* Don't extract again if files were already extracted

* Fix MKS attachment extraction

* Always run full extraction on mks

* Don't try to extract mjpeg streams as attachments

* Fallback to check if attachments were extracted to cache folder

* Fixup

2 files changed, 55 insertions, 2 deletions

diff --git a/Emby.Server.Implementations/Library/LibraryManager.cs b/Emby.Server.Implementations/Library/LibraryManager.cs
index ab8884f17..1303bb3cb 100644
--- a/Emby.Server.Implementations/Library/LibraryManager.cs
+++ b/Emby.Server.Implementations/Library/LibraryManager.cs
@@ -492,7 +492,24 @@ namespace Emby.Server.Implementations.Library
 
             if (item is Video video)
             {
+                // Trickplay
                 list.Add(_pathManager.GetTrickplayDirectory(video));
+
+                // Subtitles and attachments
+                foreach (var mediaSource in item.GetMediaSources(false))
+                {
+                    var subtitleFolder = _pathManager.GetSubtitleFolderPath(mediaSource.Id);
+                    if (subtitleFolder is not null)
+                    {
+                        list.Add(subtitleFolder);
+                    }
+
+                    var attachmentFolder = _pathManager.GetAttachmentFolderPath(mediaSource.Id);
+                    if (attachmentFolder is not null)
+                    {
+                        list.Add(attachmentFolder);
+                    }
+                }
             }
 
             return list;
diff --git a/Emby.Server.Implementations/Library/PathManager.cs b/Emby.Server.Implementations/Library/PathManager.cs
index c910abadb..ac004b413 100644
--- a/Emby.Server.Implementations/Library/PathManager.cs
+++ b/Emby.Server.Implementations/Library/PathManager.cs
@@ -1,5 +1,7 @@
+using System;
 using System.Globalization;
 using System.IO;
+using MediaBrowser.Common.Configuration;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.IO;
@@ -12,22 +14,56 @@ namespace Emby.Server.Implementations.Library;
 public class PathManager : IPathManager
 {
     private readonly IServerConfigurationManager _config;
+    private readonly IApplicationPaths _appPaths;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="PathManager"/> class.
     /// </summary>
     /// <param name="config">The server configuration manager.</param>
+    /// <param name="appPaths">The application paths.</param>
     public PathManager(
-        IServerConfigurationManager config)
+        IServerConfigurationManager config,
+        IApplicationPaths appPaths)
     {
         _config = config;
+        _appPaths = appPaths;
+    }
+
+    private string SubtitleCachePath => Path.Combine(_appPaths.DataPath, "subtitles");
+
+    private string AttachmentCachePath => Path.Combine(_appPaths.DataPath, "attachments");
+
+    /// <inheritdoc />
+    public string GetAttachmentPath(string mediaSourceId, string fileName)
+    {
+        return Path.Join(GetAttachmentFolderPath(mediaSourceId), fileName);
+    }
+
+    /// <inheritdoc />
+    public string GetAttachmentFolderPath(string mediaSourceId)
+    {
+        var id = Guid.Parse(mediaSourceId);
+        return Path.Join(AttachmentCachePath, id.ToString("D", CultureInfo.InvariantCulture));
+    }
+
+    /// <inheritdoc />
+    public string GetSubtitleFolderPath(string mediaSourceId)
+    {
+        var id = Guid.Parse(mediaSourceId);
+        return Path.Join(SubtitleCachePath, id.ToString("D", CultureInfo.InvariantCulture));
+    }
+
+    /// <inheritdoc />
+    public string GetSubtitlePath(string mediaSourceId, int streamIndex, string extension)
+    {
+        return Path.Join(GetSubtitleFolderPath(mediaSourceId), streamIndex.ToString(CultureInfo.InvariantCulture) + extension);
     }
 
     /// <inheritdoc />
     public string GetTrickplayDirectory(BaseItem item, bool saveWithMedia = false)
     {
         var basePath = _config.ApplicationPaths.TrickplayPath;
-        var idString = item.Id.ToString("N", CultureInfo.InvariantCulture);
+        var idString = item.Id.ToString("D", CultureInfo.InvariantCulture);
 
         return saveWithMedia
             ? Path.Combine(item.ContainingFolderPath, Path.ChangeExtension(item.Path, ".trickplay"))