xCommons/Filters/SwaggerDefaultValuesOperationFilter.cs

using System.Linq;
using Microsoft.OpenApi.Any;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.SwaggerGen;
using xCommons.Configurations;
using xCommons.Extensions;

namespace xCommons.Filters
{
    public class SwaggerDefaultValuesOperationFilter : IOperationFilter
    {
        private readonly XSwaggerConfiguration config;

        public SwaggerDefaultValuesOperationFilter(
            XSwaggerConfiguration config
        )
        {
            this.config = config;
        }

        public void Apply(
            OpenApiOperation operation,
            OperationFilterContext context
        )
        {
            //
            // Validate Configuration ...
            if (
                !config.IsNull() &&
                !config.DefaultValues.IsNull() &&
                config.DefaultValues.HasChild()
            )
            {
                //                
                foreach (var prv in config.DefaultValues)
                {
                    //
                    // Detect Parameter ...
                    var swaggerParam = operation.Parameters.FirstOrDefault(p => p.Name == prv.Key);
                    if (!swaggerParam.IsNull())
                    {
                        swaggerParam.Schema.Default = new OpenApiString(prv.Value);
                    }
                }
            }
        }
    }
}