JScriptHTTPGateway.cs

// %WINDIR%\Microsoft.NET\Framework\v3.5\csc.exe /r:Microsoft.JScript.dll JScriptHTTPGateway.cs
using System;
using System.Net;
using System.CodeDom.Compiler;
using System.Reflection;

class JScriptHTTPGateway {
    static void Main (string[] args) {
        Microsoft.JScript.JScriptCodeProvider jsProvider = new Microsoft.JScript.JScriptCodeProvider();

        CompilerParameters compilerParams = new CompilerParameters();
        compilerParams.GenerateExecutable = true;
        compilerParams.GenerateInMemory   = true;

        HttpListener listener = new HttpListener();
        listener.Prefixes.Add("http://" + args[0] + "/");
        listener.Start();

        Console.WriteLine("Listening on http://" + args[0] + "/");

        while (true) {
            HttpListenerContext context = listener.GetContext();
            HttpListenerRequest request   = context.Request;
            HttpListenerResponse response = context.Response;

            System.IO.Stream inputStream = request.InputStream;
            System.IO.StreamReader reader = new System.IO.StreamReader(inputStream);
            string content = reader.ReadToEnd();

            System.IO.Stream outputStream = response.OutputStream;
            System.IO.StreamWriter writer = new System.IO.StreamWriter(outputStream);

            Console.WriteLine("{0} - {1}", request.UserHostAddress, content);

            CompilerResults result = jsProvider.CompileAssemblyFromSource(
                compilerParams, "package JScriptHTTPGateway { class Evaluator { public static function evaluate () { " + content + " } } }"
            );

            if (result.Errors.Count > 0) {
                response.StatusCode = 400;
                foreach (CompilerError e in result.Errors) {
                    writer.WriteLine(e);
                }
            } else {
                try {
                    Type evaluatorClass = result.CompiledAssembly.GetType("JScriptHTTPGateway.Evaluator");
                    object evalResult = evaluatorClass.InvokeMember(
                        "evaluate", BindingFlags.InvokeMethod, null, null, new object[] {}
                    );

                    writer.WriteLine(evalResult);
                } catch (Exception e) {
                    response.StatusCode = 500;
                    writer.WriteLine(e);
                }
            }
            
            writer.Close();
        }
    }
}