From 4241165b6828809778bda6bf8e64631fe677f99e Mon Sep 17 00:00:00 2001
From: Artem Levin <64748654+Leo506@users.noreply.github.com>
Date: Fri, 27 Sep 2024 10:19:00 +0500
Subject: [PATCH] Feature. Add Extensions property for ProblemDetails class
 (#57)

Co-authored-by: Artem Levin <alevin@arbus.biz>
---
 src/Arbus.Network/ProblemDetails.cs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/Arbus.Network/ProblemDetails.cs b/src/Arbus.Network/ProblemDetails.cs
index 02146dc..4ad11b4 100644
--- a/src/Arbus.Network/ProblemDetails.cs
+++ b/src/Arbus.Network/ProblemDetails.cs
@@ -1,4 +1,6 @@
-namespace Arbus.Network;
+using System.Text.Json.Serialization;
+
+namespace Arbus.Network;
 
 /// <summary>
 /// A machine-readable format for specifying errors in HTTP API responses based on <a href="https://tools.ietf.org/html/rfc7807">specification</a>.
@@ -30,4 +32,18 @@ public record ProblemDetails
     ///     or may not yield further information if dereferenced.
     /// </summary>
     public string? Instance { get; set; }
+    
+    /// <summary>
+    /// Gets the <see cref="IDictionary{TKey, TValue}"/> for extension members.
+    /// <para>
+    /// Problem type definitions MAY extend the problem details object with additional members. Extension members appear in the same namespace as
+    /// other members of a problem type.
+    /// </para>
+    /// </summary>
+    /// <remarks>
+    /// The round-tripping behavior for <see cref="Extensions"/> is determined by the implementation of the Input \ Output formatters.
+    /// In particular, complex types or collection types may not round-trip to the original type when using the built-in JSON or XML formatters.
+    /// </remarks>
+    [JsonExtensionData]
+    public IDictionary<string, object?> Extensions { get; set; } = new Dictionary<string, object?>(StringComparer.Ordinal);
 }
\ No newline at end of file