1 files changed, 55 insertions, 0 deletions
diff --git a/Timeline/Swagger/DocumentDescriptionDocumentProcessor.cs b/Timeline/Swagger/DocumentDescriptionDocumentProcessor.cs
new file mode 100644
index 00000000..dc5ddd96
--- /dev/null
+++ b/Timeline/Swagger/DocumentDescriptionDocumentProcessor.cs
@@ -0,0 +1,55 @@
+using NSwag.Generation.Processors;
+using NSwag.Generation.Processors.Contexts;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using Timeline.Models.Http;
+
+namespace Timeline.Swagger
+{
+    public class DocumentDescriptionDocumentProcessor : IDocumentProcessor
+    {
+        private static Dictionary<string, int> GetAllErrorCodes()
+        {
+            var errorCodes = new Dictionary<string, int>();
+
+            void RecursiveCheckErrorCode(Type type)
+            {
+                foreach (var field in type.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy)
+                    .Where(fi => fi.IsLiteral && !fi.IsInitOnly && fi.FieldType == typeof(int)))
+                {
+                    var name = (type.FullName + "." + field.Name).Remove(0, typeof(ErrorCodes).FullName!.Length + 1).Replace("+", ".", StringComparison.OrdinalIgnoreCase);
+                    int value = (int)field.GetRawConstantValue()!;
+                    errorCodes.Add(name, value);
+                }
+
+                foreach (var nestedType in type.GetNestedTypes())
+                {
+                    RecursiveCheckErrorCode(nestedType);
+                }
+            }
+
+            RecursiveCheckErrorCode(typeof(ErrorCodes));
+
+            return errorCodes;
+        }
+
+        public void Process(DocumentProcessorContext context)
+        {
+            StringBuilder description = new StringBuilder();
+            description.AppendLine("# Error Codes");
+            description.AppendLine("name | value");
+            description.AppendLine("---- | -----");
+            foreach (var (name, value) in GetAllErrorCodes())
+            {
+                description.AppendLine($"`{name}` | `{value}`");
+            }
+
+            context.Document.Info.Description = description.ToString();
+        }
+    }
+}