1 files changed, 42 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/Library/SimilarItems/SimilarItemsAccessFilter.cs b/Emby.Server.Implementations/Library/SimilarItems/SimilarItemsAccessFilter.cs
new file mode 100644
index 0000000000..75aea0eab6
--- /dev/null
+++ b/Emby.Server.Implementations/Library/SimilarItems/SimilarItemsAccessFilter.cs
@@ -0,0 +1,42 @@
+using Jellyfin.Data.Enums;
+using Jellyfin.Database.Implementations.Entities;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Library;
+
+namespace Emby.Server.Implementations.Library.SimilarItems;
+
+/// <summary>
+/// Builds the access filter that decides which items a similar-items lookup may return for a user.
+/// </summary>
+internal static class SimilarItemsAccessFilter
+{
+    private static readonly BaseItemKind[] _itemByNameKinds =
+    [
+        BaseItemKind.Person,
+        BaseItemKind.Genre,
+        BaseItemKind.MusicGenre,
+        BaseItemKind.MusicArtist,
+        BaseItemKind.Studio
+    ];
+
+    /// <summary>
+    /// Builds an access filter carrying the user's library access and parental restrictions.
+    /// </summary>
+    /// <param name="user">The user the lookup runs for.</param>
+    /// <param name="libraryManager">The library manager.</param>
+    /// <returns>The access filter.</returns>
+    public static InternalItemsQuery Build(User user, ILibraryManager libraryManager)
+    {
+        // IncludeItemTypes is read only for the by-name exemption here; the caller applies this
+        // filter through ApplyAccessFiltering, which does not translate it into a type restriction.
+        var accessFilter = new InternalItemsQuery(user)
+        {
+            IncludeItemTypes = _itemByNameKinds
+        };
+
+        // ConfigureUserAccess populates TopParentIds for the libraries the user may open.
+        libraryManager.ConfigureUserAccess(accessFilter, user);
+
+        return accessFilter;
+    }
+}