Initial mirror.

MareSynchronosAPI/Data/FileReplacementData.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+using System.Text.Json;
+using System.Text;
+using System.Security.Cryptography;
+
+
+namespace MareSynchronos.API.Data;
+
+[MessagePackObject(keyAsPropertyName: true)]
+public class FileReplacementData
+{
+    public FileReplacementData()
+    {
+        DataHash = new(() =>
+        {
+            var json = JsonSerializer.Serialize(this);
+#pragma warning disable SYSLIB0021 // Type or member is obsolete
+            using SHA256CryptoServiceProvider cryptoProvider = new();
+#pragma warning restore SYSLIB0021 // Type or member is obsolete
+            return BitConverter.ToString(cryptoProvider.ComputeHash(Encoding.UTF8.GetBytes(json))).Replace("-", "", StringComparison.Ordinal);
+        });
+    }
+
+    [JsonIgnore]
+    public Lazy<string> DataHash { get; }
+    public string[] GamePaths { get; set; } = Array.Empty<string>();
+    public string Hash { get; set; } = string.Empty;
+    public string FileSwapPath { get; set; } = string.Empty;
+}