source: TFP-WebServer/MapRendering/src/Api/Map.cs@ 467

using System.Net;
using JetBrains.Annotations;
using Utf8Json;
using Webserver;
using Webserver.Permissions;
using Webserver.WebAPI;

namespace MapRendering.Api {
        [UsedImplicitly]
        public class Map : AbsRestApi {

                protected override void HandleRestGet (RequestContext _context) {
                        string id = _context.RequestPath;
                        
                        PrepareEnvelopedResult (out JsonWriter writer);

                        switch (id) {
                                case "config":
                                        writeConfig (ref writer);
                                        break;
                                default:
                                        SendEmptyResponse (_context, HttpStatusCode.NotImplemented, _errorCode: "INVALID_ID");
                                        return;
                        }
                        
                        SendEnvelopedResult (_context, ref writer);
                }

                private static readonly byte[] jsonKeyEnabled = JsonWriter.GetEncodedPropertyNameWithBeginObject ("enabled");
                private static readonly byte[] jsonKeyMapBlockSize = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("mapBlockSize");
                private static readonly byte[] jsonKeyMaxZoom = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("maxZoom");
                private static readonly byte[] jsonKeyMapSize = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("mapSize");
                
                private void writeConfig (ref JsonWriter writer) {
                        writer.WriteRaw (jsonKeyEnabled);
                        writer.WriteBoolean (MapRenderer.Enabled);

                        writer.WriteRaw (jsonKeyMapBlockSize);
                        writer.WriteInt32 (Constants.MapBlockSize);

                        writer.WriteRaw (jsonKeyMaxZoom);
                        writer.WriteInt32 (Constants.Zoomlevels - 1);

                        GameManager.Instance.World.GetWorldExtent (out Vector3i worldMinPos, out Vector3i worldMaxPos);
                        Vector3i worldSize = worldMaxPos - worldMinPos;

                        writer.WriteRaw (jsonKeyMapSize);
                        JsonCommons.WriteVector3I (ref writer, worldSize);
                        
                        writer.WriteEndObject ();
                }

                public override int[] DefaultMethodPermissionLevels () => new[] {
                        AdminWebModules.MethodLevelNotSupported,
                        AdminWebModules.PermissionLevelGuest,
                        AdminWebModules.MethodLevelInheritGlobal,
                        AdminWebModules.MethodLevelInheritGlobal,
                        AdminWebModules.MethodLevelInheritGlobal
                };
        }
}