Alchegos.MCP/Middleware/RequestBodyLoggingMiddleware.cs

using System.Text;

namespace Alchegos.MCP.Middleware
{

    public class RequestBodyLoggingMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger _logger;
        public RequestBodyLoggingMiddleware(RequestDelegate next, ILogger<RequestBodyLoggingMiddleware> logger)
        {
            _next = next;
            _logger = logger;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            if (context.Request.Method == HttpMethods.Post && context.Request.ContentLength > 0)
            {
                context.Request.EnableBuffering();

                using var reader = new StreamReader(
                    context.Request.Body,
                    encoding: Encoding.UTF8,
                    detectEncodingFromByteOrderMarks: false,
                    bufferSize: 4096,
                    leaveOpen: true);

                var requestBody = await reader.ReadToEndAsync();
                context.Request.Body.Position = 0;

                _logger.LogTrace("Request Body (POST {RequestPath}):\n{RequestBody}", context.Request.Path, requestBody);

            }

            await _next(context);
        }
    }
}

namespace Microsoft.AspNetCore.Builder
{
    public static class RequestBodyLoggingMiddlewareExtensions
    {
        public static IApplicationBuilder UseRequestBodyLogging(
            this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<Alchegos.MCP.Middleware.RequestBodyLoggingMiddleware>();
        }
    }
}