first commit

NitroxServer/Serialization/SaveDataUpgrades/SaveDataUpgrade.cs

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+using System;
+using System.IO;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Linq;
+using NitroxServer.Serialization.Json;
+
+namespace NitroxServer.Serialization.Upgrade
+{
+    public abstract class SaveDataUpgrade
+    {
+        private readonly JsonConverter[] converters = { new NitroxIdConverter(), new TechTypeConverter(), new VersionConverter(), new KeyValuePairConverter(), new StringEnumConverter() };
+
+        public abstract Version TargetVersion { get; }
+
+        public static readonly Version MinimumSaveVersion = new(1, 8, 0, 0);
+        
+        public void UpgradeSaveFiles(string saveDir, string fileEnding)
+        {
+            Log.Info($"┌── Executing {GetType().Name}");
+            string baseDataPath = Path.Combine(saveDir, $"BaseData{fileEnding}");
+            string playerDataPath = Path.Combine(saveDir, $"PlayerData{fileEnding}");
+            string worldDataPath = Path.Combine(saveDir, $"WorldData{fileEnding}");
+            string entityDataPath = Path.Combine(saveDir, $"EntityData{fileEnding}");
+
+            Log.Info("├── Parsing raw json");
+            JObject baseData = JObject.Parse(File.ReadAllText(baseDataPath));
+            JObject playerData = JObject.Parse(File.ReadAllText(playerDataPath));
+            JObject worldData = JObject.Parse(File.ReadAllText(worldDataPath));
+            JObject entityData = JObject.Parse(File.ReadAllText(entityDataPath));
+
+            Log.Info("├── Applying upgrade scripts");
+            UpgradeBaseData(baseData);
+            UpgradePlayerData(playerData);
+            UpgradeWorldData(worldData);
+            UpgradeEntityData(entityData);
+
+            Log.Info("└── Saving to disk");
+            File.WriteAllText(baseDataPath, baseData.ToString(Formatting.None, converters));
+            File.WriteAllText(playerDataPath, playerData.ToString(Formatting.None, converters));
+            File.WriteAllText(worldDataPath, worldData.ToString(Formatting.None, converters));
+            File.WriteAllText(entityDataPath, entityData.ToString(Formatting.None, converters));
+        }
+
+        protected virtual void UpgradeBaseData(JObject data) { }
+        protected virtual void UpgradePlayerData(JObject data) { }
+        protected virtual void UpgradeWorldData(JObject data) { }
+        protected virtual void UpgradeEntityData(JObject data) { }
+    }
+}