source: binary-improvements2/MapRendering/Web/Handlers/ApiHandler.cs@ 386

using System;
using System.Collections.Generic;
using System.Net;
using System.Reflection;
using AllocsFixes.NetConnections.Servers.Web.API;
using HttpListenerRequest = SpaceWizards.HttpListener.HttpListenerRequest;
using HttpListenerResponse = SpaceWizards.HttpListener.HttpListenerResponse;

namespace AllocsFixes.NetConnections.Servers.Web.Handlers {
        public class ApiHandler : AbsHandler {
                private readonly Dictionary<string, WebAPI> apis = new CaseInsensitiveStringDictionary<WebAPI> ();

                public ApiHandler () : base (null) {

                }

                public override void SetBasePathAndParent (Web _parent, string _relativePath) {
                        base.SetBasePathAndParent (_parent, _relativePath);

                        Type[] apiWithParentCtorTypes = { typeof (Web) };
                        Object[] apiWithParentCtorArgs = { _parent };

                        Type[] apiEmptyCtorTypes = { };
                        Object[] apiEmptyCtorArgs = { };
                        
                        foreach (Type t in Assembly.GetExecutingAssembly ().GetTypes ()) {
                                if (!t.IsAbstract && t.IsSubclassOf (typeof (WebAPI))) {
                                        ConstructorInfo ctor = t.GetConstructor (apiWithParentCtorTypes);
                                        if (ctor != null) {
                                                WebAPI apiInstance = (WebAPI) ctor.Invoke (apiWithParentCtorArgs);
                                                addApi (apiInstance);
                                                continue;
                                        }
                                        
                                        ctor = t.GetConstructor (apiEmptyCtorTypes);
                                        if (ctor != null) {
                                                WebAPI apiInstance = (WebAPI) ctor.Invoke (apiEmptyCtorArgs);
                                                addApi (apiInstance);
                                        }
                                }
                        }

                        // Permissions that don't map to a real API
                        addApi (new Null ("viewallclaims"));
                        addApi (new Null ("viewallplayers"));
                }

                private void addApi (WebAPI _api) {
                        apis.Add (_api.Name, _api);
                        WebPermissions.Instance.AddKnownModule ("webapi." + _api.Name, _api.DefaultPermissionLevel ());
                }

#if ENABLE_PROFILER
                private static readonly UnityEngine.Profiling.CustomSampler apiHandlerSampler = UnityEngine.Profiling.CustomSampler.Create ("API_Handler");
#endif

                public override void HandleRequest (string _requestPath, HttpListenerRequest _req, HttpListenerResponse _resp, WebConnection _con,
                        int _permissionLevel) {
                        string apiName = _requestPath.Remove (0, urlBasePath.Length);

                        if (!apis.TryGetValue (apiName, out WebAPI api)) {
                                Log.Out ($"Error in {nameof(ApiHandler)}.HandleRequest(): No handler found for API \"{apiName}\"");
                                _resp.StatusCode = (int) HttpStatusCode.NotFound;
                                return;
                        }

                        if (!AuthorizeForApi (apiName, _permissionLevel)) {
                                _resp.StatusCode = (int) HttpStatusCode.Forbidden;
                                if (_con != null) {
                                        //Log.Out ($"{nameof(ApiHandler)}: user '{user.SteamID}' not allowed to execute '{apiName}'");
                                }

                                return;
                        }

                        try {
#if ENABLE_PROFILER
                                apiHandlerSampler.Begin ();
#endif
                                api.HandleRequest (_req, _resp, _con, _permissionLevel);
#if ENABLE_PROFILER
                                apiHandlerSampler.End ();
#endif
                        } catch (Exception e) {
                                Log.Error ($"Error in {nameof(ApiHandler)}.HandleRequest(): Handler {api.Name} threw an exception:");
                                Log.Exception (e);
                                _resp.StatusCode = (int) HttpStatusCode.InternalServerError;
                        }
                }

                private bool AuthorizeForApi (string _apiName, int _permissionLevel) {
                        return WebPermissions.Instance.ModuleAllowedWithLevel ("webapi." + _apiName, _permissionLevel);
                }
        }
}