1 files changed, 103 insertions, 0 deletions
diff --git a/Jellyfin.Server/Migrations/Routines/MigrateRatingLevels.cs b/Jellyfin.Server/Migrations/Routines/MigrateRatingLevels.cs
new file mode 100644
index 000000000..9dee520a5
--- /dev/null
+++ b/Jellyfin.Server/Migrations/Routines/MigrateRatingLevels.cs
@@ -0,0 +1,103 @@
+using System;
+using System.Globalization;
+using System.IO;
+
+using Emby.Server.Implementations.Data;
+using MediaBrowser.Controller;
+using MediaBrowser.Controller.Persistence;
+using MediaBrowser.Model.Globalization;
+using Microsoft.Extensions.Logging;
+using SQLitePCL.pretty;
+
+namespace Jellyfin.Server.Migrations.Routines
+{
+    /// <summary>
+    /// Migrate rating levels to new rating level system.
+    /// </summary>
+    internal class MigrateRatingLevels : IMigrationRoutine
+    {
+        private const string DbFilename = "library.db";
+        private readonly ILogger<MigrateRatingLevels> _logger;
+        private readonly IServerApplicationPaths _applicationPaths;
+        private readonly ILocalizationManager _localizationManager;
+        private readonly IItemRepository _repository;
+
+        public MigrateRatingLevels(
+            IServerApplicationPaths applicationPaths,
+            ILoggerFactory loggerFactory,
+            ILocalizationManager localizationManager,
+            IItemRepository repository)
+        {
+            _applicationPaths = applicationPaths;
+            _localizationManager = localizationManager;
+            _repository = repository;
+            _logger = loggerFactory.CreateLogger<MigrateRatingLevels>();
+        }
+
+        /// <inheritdoc/>
+        public Guid Id => Guid.Parse("{67445D54-B895-4B24-9F4C-35CE0690EA07}");
+
+        /// <inheritdoc/>
+        public string Name => "MigrateRatingLevels";
+
+        /// <inheritdoc/>
+        public bool PerformOnNewInstall => false;
+
+        /// <inheritdoc/>
+        public void Perform()
+        {
+            var dbPath = Path.Combine(_applicationPaths.DataPath, DbFilename);
+
+            // Back up the database before modifying any entries
+            for (int i = 1; ; i++)
+            {
+                var bakPath = string.Format(CultureInfo.InvariantCulture, "{0}.bak{1}", dbPath, i);
+                if (!File.Exists(bakPath))
+                {
+                    try
+                    {
+                        File.Copy(dbPath, bakPath);
+                        _logger.LogInformation("Library database backed up to {BackupPath}", bakPath);
+                        break;
+                    }
+                    catch (Exception ex)
+                    {
+                        _logger.LogError(ex, "Cannot make a backup of {Library} at path {BackupPath}", DbFilename, bakPath);
+                        throw;
+                    }
+                }
+            }
+
+            // Migrate parental rating strings to new levels
+            _logger.LogInformation("Recalculating parental rating levels based on rating string.");
+            using (var connection = SQLite3.Open(
+                dbPath,
+                ConnectionFlags.ReadWrite,
+                null))
+            {
+                var queryResult = connection.Query("SELECT DISTINCT OfficialRating FROM TypedBaseItems");
+                foreach (var entry in queryResult)
+                {
+                    var ratingString = entry[0].ToString();
+                    if (string.IsNullOrEmpty(ratingString))
+                    {
+                        connection.Execute("UPDATE TypedBaseItems SET InheritedParentalRatingValue = NULL WHERE OfficialRating IS NULL OR OfficialRating='';");
+                    }
+                    else
+                    {
+                        var ratingValue = _localizationManager.GetRatingLevel(ratingString).ToString();
+                        if (string.IsNullOrEmpty(ratingValue))
+                        {
+                            ratingValue = "NULL";
+                        }
+
+                        var statement = connection.PrepareStatement("UPDATE TypedBaseItems SET InheritedParentalRatingValue = @Value WHERE OfficialRating = @Rating;");
+                        statement.TryBind("@Value", ratingValue);
+                        statement.TryBind("@Rating", ratingString);
+                        statement.ExecuteQuery();
+                    }
+                }
+            }
+        }
+    }
+}