feat: import/export settings, send backup of settings when leaving guild

Catalogger.Backend/JsonUtils.cs

@@ -0,0 +1,27 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using NodaTime;
+using NodaTime.Serialization.SystemTextJson;
+using NodaTime.Text;
+
+namespace Catalogger.Backend;
+
+public static class JsonUtils
+{
+    public static readonly NodaJsonSettings NodaTimeSettings = new NodaJsonSettings
+    {
+        InstantConverter = new NodaPatternConverter<Instant>(InstantPattern.ExtendedIso),
+    };
+
+    public static readonly JsonSerializerOptions BaseJsonOptions = new JsonSerializerOptions
+    {
+        NumberHandling = JsonNumberHandling.AllowReadingFromString,
+    }.ConfigureForNodaTime(NodaTimeSettings);
+
+    public static readonly JsonSerializerOptions ApiJsonOptions = new JsonSerializerOptions
+    {
+        NumberHandling =
+            JsonNumberHandling.WriteAsString | JsonNumberHandling.AllowReadingFromString,
+        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
+    }.ConfigureForNodaTime(NodaTimeSettings);
+}