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FrameWork/SwashbuckleEx/Swashbuckle.Core/Swagger/JsonPropertyExtensions.cs

@@ -0,0 +1,41 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Reflection;
+using Newtonsoft.Json.Serialization;
+
+namespace Swashbuckle.Swagger
+{
+    public static class JsonPropertyExtensions
+    {
+        public static bool IsRequired(this JsonProperty jsonProperty)
+        {
+            return jsonProperty.HasAttribute<RequiredAttribute>();
+        }
+
+        public static bool IsObsolete(this JsonProperty jsonProperty)
+        {
+            return jsonProperty.HasAttribute<ObsoleteAttribute>();
+        }
+
+        public static bool HasAttribute<T>(this JsonProperty jsonProperty)
+        {
+            var propInfo = jsonProperty.PropertyInfo();
+            return propInfo != null && Attribute.IsDefined(propInfo, typeof (T));
+        }
+
+        public static PropertyInfo PropertyInfo(this JsonProperty jsonProperty)
+        {
+            if (jsonProperty.UnderlyingName == null) return null;
+
+            var metadata = jsonProperty.DeclaringType.GetCustomAttributes(typeof(MetadataTypeAttribute), true)
+                .FirstOrDefault();
+
+            var typeToReflect = (metadata != null)
+                ? ((MetadataTypeAttribute)metadata).MetadataClassType
+                : jsonProperty.DeclaringType;
+
+            return typeToReflect.GetProperty(jsonProperty.UnderlyingName, jsonProperty.PropertyType);
+        }
+    }
+}