source: binary-improvements/MapRendering/Web/API/GetLandClaims.cs@ 322

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

namespace AllocsFixes.NetConnections.Servers.Web.API
{
        public class GetLandClaims : WebAPI {
                public override void HandleRequest (HttpListenerRequest req, HttpListenerResponse resp, WebConnection user, int permissionLevel) {
                        string requestedSteamID = string.Empty;

                        if (req.QueryString ["steamid"] != null) {
                                ulong lViewersSteamID;
                                requestedSteamID = req.QueryString ["steamid"];
                                if (requestedSteamID.Length != 17 || !ulong.TryParse (requestedSteamID, out lViewersSteamID)) {
                                        resp.StatusCode = (int)HttpStatusCode.BadRequest;
                                        Web.SetResponseTextContent (resp, "Invalid SteamID given");
                                        return;
                                }
                        }

                        // default user, cheap way to avoid 'null reference exception'
                        user = user ?? new WebConnection ("", "", 0L);

                        bool bViewAll = WebConnection.CanViewAllClaims (permissionLevel);
            
                        JSONObject result = new JSONObject ();
                        result.Add ("claimsize", new JSONNumber (GamePrefs.GetInt (EnumGamePrefs.LandClaimSize)));

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

                        LandClaimList.OwnerFilter[] ownerFilters = null;
                        if (!string.IsNullOrEmpty (requestedSteamID) || !bViewAll) {
                                if (!string.IsNullOrEmpty (requestedSteamID) && !bViewAll) {
                                        ownerFilters = new LandClaimList.OwnerFilter[] {
                                                LandClaimList.SteamIdFilter (user.SteamID.ToString ()),
                                                LandClaimList.SteamIdFilter (requestedSteamID)
                                        };
                                } else if (!bViewAll) {
                                        ownerFilters = new LandClaimList.OwnerFilter[] { LandClaimList.SteamIdFilter (user.SteamID.ToString ()) };
                                } else {
                                        ownerFilters = new LandClaimList.OwnerFilter[] { LandClaimList.SteamIdFilter (requestedSteamID) };
                                }
                        }
                        LandClaimList.PositionFilter[] posFilters = null;

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

                        foreach (KeyValuePair<PersistentData.Player, List<Vector3i>> kvp in claims) {

                                try {
                                        JSONObject owner = new JSONObject ();
                                        claimOwners.Add (owner);

                                        owner.Add ("steamid", new JSONString (kvp.Key.SteamID));
                                        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);
                                        }
                                } catch {
                                }
                        }

                        WriteJSON (resp, result);
                }
        }
}