WireMock.Net/src/WireMock.Net.OpenApiParser/Extensions/OpenApiSchemaExtensions.cs

using Microsoft.OpenApi.Any;
using Microsoft.OpenApi.Interfaces;
using Microsoft.OpenApi.Models;
using WireMock.Net.OpenApiParser.Types;

namespace WireMock.Net.OpenApiParser.Extensions
{
    internal static class OpenApiSchemaExtensions
    {
        /// <summary>
        /// https://stackoverflow.com/questions/48111459/how-to-define-a-property-that-can-be-string-or-null-in-openapi-swagger
        /// </summary>
        public static bool TryGetXNullable(this OpenApiSchema schema, out bool value)
        {
            value = false;

            if (schema.Extensions.TryGetValue("x-nullable", out IOpenApiExtension e) && e is OpenApiBoolean openApiBoolean)
            {
                value = openApiBoolean.Value;
                return true;
            }

            return false;
        }

        public static SchemaType GetSchemaType(this OpenApiSchema schema)
        {
            switch (schema?.Type)
            {
                case "object":
                    return SchemaType.Object;

                case "array":
                    return SchemaType.Array;

                case "integer":
                    return SchemaType.Integer;

                case "number":
                    return SchemaType.Number;

                case "boolean":
                    return SchemaType.Boolean;

                case "string":
                    return SchemaType.String;

                case "file":
                    return SchemaType.File;

                default:
                    return SchemaType.Unknown;
            }
        }

        public static SchemaFormat GetSchemaFormat(this OpenApiSchema schema)
        {
            switch (schema?.Format)
            {
                case "float":
                    return SchemaFormat.Float;

                case "double":
                    return SchemaFormat.Double;

                case "int32":
                    return SchemaFormat.Int32;

                case "int64":
                    return SchemaFormat.Int64;

                case "date":
                    return SchemaFormat.Date;

                case "date-time":
                    return SchemaFormat.DateTime;

                case "password":
                    return SchemaFormat.Password;

                case "byte":
                    return SchemaFormat.Byte;

                case "binary":
                    return SchemaFormat.Binary;

                default:
                    return SchemaFormat.Undefined;
            }
        }
    }
}