source: binary-improvements/MapRendering/Web/Handlers/UserStatusHandler.cs@ 274

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Threading;
using System.Text;
using AllocsFixes.JSON;

namespace AllocsFixes.NetConnections.Servers.Web.Handlers
{
        public class UserStatusHandler : PathHandler {
                public UserStatusHandler (string moduleName = null) : base(moduleName) {
                }

                public override void HandleRequest (HttpListenerRequest req, HttpListenerResponse resp, WebConnection user, int permissionLevel) {
                        JSONObject result = new JSONObject ();

                        result.Add ("loggedin", new JSONBoolean (user != null));
                        result.Add ("username", new JSONString (user != null ? user.SteamID.ToString () : string.Empty));

                        JSONArray perms = new JSONArray ();
                        foreach (WebPermissions.WebModulePermission perm in WebPermissions.Instance.GetModules ()) {
                                JSONObject permObj = new JSONObject ();
                                permObj.Add ("module", new JSONString (perm.module));
                                permObj.Add ("allowed", new JSONBoolean (WebPermissions.Instance.ModuleAllowedWithLevel (perm.module, permissionLevel)));
                                perms.Add (permObj);
                        }
                        result.Add ("permissions", perms);

                        WriteJSON (resp, result);
                }

                public void WriteJSON (HttpListenerResponse resp, JSONNode root) {
                        byte[] buf = Encoding.UTF8.GetBytes (root.ToString ());
                        resp.ContentLength64 = buf.Length;
                        resp.ContentType = "application/json";
                        resp.ContentEncoding = Encoding.UTF8;
                        resp.OutputStream.Write (buf, 0, buf.Length);
                }

        }

}