update to .net 9 and add new OpenAPI packages

Foxnouns.Backend/Utils/OpenApi/PropertyKeySchemaTransformer.cs

@@ -0,0 +1,69 @@
+using Foxnouns.Backend.Database;
+using Microsoft.AspNetCore.OpenApi;
+using Microsoft.OpenApi.Any;
+using Microsoft.OpenApi.Models;
+using Newtonsoft.Json.Serialization;
+
+namespace Foxnouns.Backend.Utils.OpenApi;
+
+public class PropertyKeySchemaTransformer : IOpenApiSchemaTransformer
+{
+    private static readonly DefaultContractResolver SnakeCaseConverter =
+        new() { NamingStrategy = new SnakeCaseNamingStrategy() };
+
+    public Task TransformAsync(
+        OpenApiSchema schema,
+        OpenApiSchemaTransformerContext context,
+        CancellationToken cancellationToken
+    )
+    {
+        Dictionary<string, OpenApiSchema> newProperties = new();
+        foreach (KeyValuePair<string, OpenApiSchema> property in schema.Properties)
+        {
+            newProperties[SnakeCaseConverter.GetResolvedPropertyName(property.Key)] =
+                property.Value;
+        }
+
+        schema.Properties = newProperties;
+        schema.Required = schema
+            .Required.Select(SnakeCaseConverter.GetResolvedPropertyName)
+            .ToHashSet();
+
+        return Task.CompletedTask;
+    }
+}
+
+public class ExampleFixingSchemaTransformer : IOpenApiSchemaTransformer
+{
+    public Task TransformAsync(
+        OpenApiSchema schema,
+        OpenApiSchemaTransformerContext context,
+        CancellationToken cancellationToken
+    )
+    {
+        if (context.JsonTypeInfo.Type == typeof(Snowflake))
+        {
+            schema.Type = "string";
+            schema.Example = new OpenApiString("999999999999999999");
+        }
+
+        return Task.CompletedTask;
+    }
+}
+
+public class DocumentTransformer(Config config) : IOpenApiDocumentTransformer
+{
+    public Task TransformAsync(
+        OpenApiDocument document,
+        OpenApiDocumentTransformerContext context,
+        CancellationToken cancellationToken
+    )
+    {
+        document.Info.Title = "pronouns.cc API";
+        document.Info.Version = "2.0.0";
+
+        document.Servers.Clear();
+        document.Servers.Add(new OpenApiServer { Url = config.BaseUrl });
+        return Task.CompletedTask;
+    }
+}