MappingSerializer (Newtonsoft or SystemText)-Json (#1394)

* MappingSerializer

* json

* .

* 0.8.0

* test

* mm

src/WireMock.Net.Minimal/Serialization/MappingSerializer.cs

@@ -0,0 +1,49 @@
+// Copyright © WireMock.Net
+
+using System;
+using JsonConverter.Abstractions;
+using Newtonsoft.Json.Linq;
+#if NETSTANDARD2_0_OR_GREATER || NETCOREAPP3_1_OR_GREATER || NET6_0_OR_GREATER || NET461
+using System.Text.Json;
+#endif
+
+namespace WireMock.Serialization;
+
+internal class MappingSerializer(IJsonConverter jsonConverter)
+{
+    internal T[] DeserializeJsonToArray<T>(string value)
+    {
+        return DeserializeObjectToArray<T>(jsonConverter.Deserialize<object>(value)!);
+    }
+
+    internal static T[] DeserializeObjectToArray<T>(object value)
+    {
+        if (value is JArray jArray)
+        {
+            return jArray.ToObject<T[]>()!;
+        }
+
+        if (value is JObject jObject)
+        {
+            var singleResult = jObject.ToObject<T>();
+            return [singleResult!];
+        }
+
+#if NETSTANDARD2_0_OR_GREATER || NETCOREAPP3_1_OR_GREATER || NET6_0_OR_GREATER || NET461
+        if (value is JsonElement jElement)
+        {
+            if (jElement.ValueKind == JsonValueKind.Array)
+            {
+                return jElement.Deserialize<T[]>()!;
+            }
+
+            if (jElement.ValueKind == JsonValueKind.Object)
+            {
+                var singleResult = jElement.Deserialize<T>();
+                return [singleResult!];
+            }
+        }
+#endif
+        throw new InvalidOperationException("Cannot deserialize the provided value to an array or object.");
+    }
+}