source: binary-improvements/MapRendering/Web/API/GetLandClaims.cs@ 420

using System.Collections.Generic;
using System.Net;
using AllocsFixes.JSON;
using AllocsFixes.PersistentData;

namespace AllocsFixes.NetConnections.Servers.Web.API {
        public class GetLandClaims : WebAPI {
                public override void HandleRequest (HttpListenerRequest _req, HttpListenerResponse _resp, WebConnection _user,
                        int _permissionLevel) {
                        PlatformUserIdentifierAbs requestedUserId = null;
                        if (_req.QueryString ["userid"] != null) {
                                if (!PlatformUserIdentifierAbs.TryFromCombinedString (_req.QueryString ["userid"], out requestedUserId)) {
                                        _resp.StatusCode = (int) HttpStatusCode.BadRequest;
                                        Web.SetResponseTextContent (_resp, "Invalid user id given");
                                        return;
                                }
                        }

                        // default user, cheap way to avoid 'null reference exception'
                        PlatformUserIdentifierAbs userId = _user?.UserId;

                        bool bViewAll = WebConnection.CanViewAllClaims (_permissionLevel);

                        JSONObject result = new JSONObject ();
                        result.Add ("claimsize", new JSONNumber (GamePrefs.GetInt (EnumUtils.Parse<EnumGamePrefs> (nameof(EnumGamePrefs.LandClaimSize)))));

                        JSONArray claimOwners = new JSONArray ();
                        result.Add ("claimowners", claimOwners);

                        LandClaimList.OwnerFilter[] ownerFilters = null;
                        if (requestedUserId != null || !bViewAll) {
                                if (requestedUserId != null && !bViewAll) {
                                        ownerFilters = new[] {
                                                LandClaimList.UserIdFilter (userId),
                                                LandClaimList.UserIdFilter (requestedUserId)
                                        };
                                } else if (!bViewAll) {
                                        ownerFilters = new[] {LandClaimList.UserIdFilter (userId)};
                                } else {
                                        ownerFilters = new[] {LandClaimList.UserIdFilter (requestedUserId)};
                                }
                        }

                        LandClaimList.PositionFilter[] posFilters = null;

                        Dictionary<Player, List<Vector3i>> claims = LandClaimList.GetLandClaims (ownerFilters, posFilters);

                        foreach (KeyValuePair<Player, List<Vector3i>> kvp in claims) {
                                JSONObject owner = new JSONObject ();
                                claimOwners.Add (owner);

                                owner.Add ("steamid", new JSONString (kvp.Key.PlatformId.CombinedString));
                                owner.Add ("claimactive", new JSONBoolean (kvp.Key.LandProtectionActive));

                                if (kvp.Key.Name.Length > 0) {
                                        owner.Add ("playername", new JSONString (kvp.Key.Name));
                                } else {
                                        owner.Add ("playername", new JSONNull ());
                                }

                                JSONArray claimsJson = new JSONArray ();
                                owner.Add ("claims", claimsJson);

                                foreach (Vector3i v in kvp.Value) {
                                        JSONObject claim = new JSONObject ();
                                        claim.Add ("x", new JSONNumber (v.x));
                                        claim.Add ("y", new JSONNumber (v.y));
                                        claim.Add ("z", new JSONNumber (v.z));

                                        claimsJson.Add (claim);
                                }
                        }

                        WriteJSON (_resp, result);
                }
        }
}