source: TFP-WebServer/WebServer/src/UrlHandlers/UserStatusHandler.cs@ 470

using System.Collections.Generic;
using Utf8Json;
using Webserver.Permissions;

namespace Webserver.UrlHandlers {
        public class UserStatusHandler : AbsHandler {
                public UserStatusHandler (string _moduleName = null) : base (_moduleName) {
                }

                private static readonly byte[] jsonLoggedInKey = JsonWriter.GetEncodedPropertyNameWithBeginObject ("loggedIn");
                private static readonly byte[] jsonUsernameKey = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("username");
                private static readonly byte[] jsonPermissionLevelKey = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("permissionLevel");
                private static readonly byte[] jsonPermissionsKey = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("permissions");

                private static readonly byte[] jsonModuleKey = JsonWriter.GetEncodedPropertyNameWithBeginObject ("module");
                private static readonly byte[] jsonAllowedKey = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("allowed");

                private static readonly byte[][] jsonMethodNameKeys;

                static UserStatusHandler () {
                        jsonMethodNameKeys = new byte[(int)ERequestMethod.Count][];
                        for (int i = 0; i < jsonMethodNameKeys.Length; i++) {
                                ERequestMethod method = (ERequestMethod)i;
                                jsonMethodNameKeys [i] = JsonWriter.GetEncodedPropertyName (method.ToStringCached ());
                        }
                }

                public override void HandleRequest (RequestContext _context) {
                        WebUtils.PrepareEnvelopedResult (out JsonWriter writer);
                        
                        writer.WriteRaw (jsonLoggedInKey);
                        writer.WriteBoolean (_context.Connection != null);
                        
                        writer.WriteRaw (jsonUsernameKey);
                        writer.WriteString (_context.Connection != null ? _context.Connection.Username : string.Empty);
                        
                        writer.WriteRaw (jsonPermissionLevelKey);
                        writer.WriteInt32 (_context.PermissionLevel);
                        
                        writer.WriteRaw (jsonPermissionsKey);
                        writer.WriteBeginArray ();

                        List<AdminWebModules.WebModule> list = AdminWebModules.Instance.GetModules ();
                        for (int iModule = 0; iModule < list.Count; iModule++) {
                                AdminWebModules.WebModule perm = list [iModule];
                                
                                if (iModule > 0) {
                                        writer.WriteValueSeparator ();
                                }

                                writer.WriteRaw (jsonModuleKey);
                                writer.WriteString (perm.Name);

                                writer.WriteRaw (jsonAllowedKey);
                                
                                writer.WriteBeginObject ();

                                if (perm.LevelPerMethod == null) {
                                        writer.WriteRaw (jsonMethodNameKeys [(int)ERequestMethod.GET]);
                                        writer.WriteBoolean (perm.LevelGlobal >= _context.PermissionLevel);
                                } else {
                                        bool first = true;
                                        for (int iMethod = 0; iMethod < perm.LevelPerMethod.Length; iMethod++) {
                                                int methodLevel = perm.LevelPerMethod [iMethod];
                                                
                                                if (methodLevel == AdminWebModules.MethodLevelNotSupported) {
                                                        continue;
                                                }

                                                if (methodLevel == AdminWebModules.MethodLevelInheritGlobal) {
                                                        methodLevel = perm.LevelGlobal;
                                                }

                                                if (!first) {
                                                        writer.WriteValueSeparator ();
                                                }

                                                first = false;
                                                
                                                writer.WriteRaw (jsonMethodNameKeys [iMethod]);
                                                writer.WriteBoolean (methodLevel >= _context.PermissionLevel);
                                        }
                                }

                                writer.WriteEndObject ();
                                

                                writer.WriteEndObject ();
                        }

                        writer.WriteEndArray ();
                        
                        writer.WriteEndObject ();
                        
                        WebUtils.SendEnvelopedResult (_context, ref writer);
                }
        }
}