From 89af37462ebbe1da078a6f8b4e104475519eab97 Mon Sep 17 00:00:00 2001
From: Jellyfrog <Jellyfrog@users.noreply.github.com>
Date: Tue, 15 Sep 2026 11:13:49 -0400
Subject: Backport pull request #17844 from jellyfin/release-12.z

Match parental ratings case-insensitively

Original-merge: 7d0a33b76252d5d3fcb5d3b10cbedd7658623949

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

Backported-by: Cody Robibero <cody@robibe.ro>
---
 .../Localization/LocalizationManager.cs            | 29 ++++++++++++++++------
 1 file changed, 22 insertions(+), 7 deletions(-)

(limited to 'Emby.Server.Implementations')

diff --git a/Emby.Server.Implementations/Localization/LocalizationManager.cs b/Emby.Server.Implementations/Localization/LocalizationManager.cs
index 0331ec39e5..65cb5379ea 100644
--- a/Emby.Server.Implementations/Localization/LocalizationManager.cs
+++ b/Emby.Server.Implementations/Localization/LocalizationManager.cs
@@ -139,7 +139,7 @@ namespace Emby.Server.Implementations.Localization
                     var ratingSystem = await JsonSerializer.DeserializeAsync<ParentalRatingSystem>(stream, _jsonOptions).ConfigureAwait(false)
                                 ?? throw new InvalidOperationException($"Invalid resource path: '{CountriesPath}'");
 
-                    var dict = new Dictionary<string, ParentalRatingScore?>();
+                    var dict = new Dictionary<string, ParentalRatingScore?>(StringComparer.OrdinalIgnoreCase);
                     if (ratingSystem.Ratings is not null)
                     {
                         foreach (var ratingEntry in ratingSystem.Ratings)
@@ -374,12 +374,25 @@ namespace Emby.Server.Implementations.Localization
         {
             ArgumentException.ThrowIfNullOrEmpty(rating);
 
+            // Handle unrated content. This has to happen before the split below,
+            // because some of the unrated values contain a '/' themselves (e.g. "n/a").
+            if (IsUnrated(rating))
+            {
+                return null;
+            }
+
             // Some providers may list multiple ratings separated by '/' (e.g. "SE:15 / SE:15+ / SE:Från 15 år").
             // Try each one in order and use the first that resolves.
             var ratingValues = rating.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
 
             foreach (var ratingValue in ratingValues)
             {
+                // A single entry of such a list may be unrated while a later one still resolves
+                if (IsUnrated(ratingValue))
+                {
+                    continue;
+                }
+
                 var score = GetSingleRatingScore(ratingValue, countryCode);
                 if (score is not null)
                 {
@@ -390,17 +403,19 @@ namespace Emby.Server.Implementations.Localization
             return null;
         }
 
+        /// <summary>
+        /// Checks whether a rating value marks the content as unrated.
+        /// </summary>
+        /// <param name="rating">Rating value to check.</param>
+        /// <returns>Returns true if the value is an unrated marker.</returns>
+        private static bool IsUnrated(ReadOnlySpan<char> rating)
+            => _unratedValues.Contains(rating.Trim(), StringComparison.OrdinalIgnoreCase);
+
         /// <summary>
         /// Resolves a single rating value to a score.
         /// </summary>
         private ParentalRatingScore? GetSingleRatingScore(string rating, string? countryCode)
         {
-            // Handle unrated content
-            if (_unratedValues.Contains(rating.AsSpan(), StringComparison.OrdinalIgnoreCase))
-            {
-                return null;
-            }
-
             // Convert ints directly
             // This may override some of the locale specific age ratings (but those always map to the same age)
             if (TryParseRatingAsScore(rating, out var ratingAge))
-- 
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