Player.Login.cs

/*
Copyright 2010 MCSharp team (Modified for use with MCZall/MCLawl/MCGalaxy)
Dual-licensed under the Educational Community License, Version 2.0 and
the GNU General Public License, Version 3 (the "Licenses"); you may
not use this file except in compliance with the Licenses. You may
obtain a copy of the Licenses at
http://www.opensource.org/licenses/ecl2.php
http://www.gnu.org/licenses/gpl-3.0.html
Unless required by applicable law or agreed to in writing,
software distributed under the Licenses are distributed on an "AS IS"
BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
or implied. See the Licenses for the specific language governing
permissions and limitations under the Licenses.
 */
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using MCGalaxy.Commands;
using MCGalaxy.DB;
using MCGalaxy.Events.PlayerEvents;
using MCGalaxy.Games;
using MCGalaxy.Maths;
using MCGalaxy.Network;
using MCGalaxy.SQL;
using MCGalaxy.Tasks;
using MCGalaxy.Util;

namespace MCGalaxy 
{
    public partial class Player : IDisposable 
    { 
        int HandleLogin(byte[] buffer, int offset, int left) {
            // protocol versions < 6 didn't have the usertype field,
            //  hence this two-packet-size-handling monstrosity
            const int old_size = 1 + 1 + 64 + 64;
            const int new_size = 1 + 1 + 64 + 64 + 1;
            // the packet must be at least old_size long
            if (left < old_size) return 0;  
            
            LastAction      = DateTime.UtcNow;
            ProtocolVersion = buffer[offset + 1];
            if (ProtocolVersion > Server.VERSION_0030) {
                Leave(null, "Unsupported protocol version", true); return -1; 
            }
            
            // check size now that know whether usertype field is included or not
            int size = ProtocolVersion >= Server.VERSION_0020 ? new_size : old_size;
            if (left < size) return 0;
            if (loggedIn)    return size;
            
            name = NetUtils.ReadString(buffer, offset + 2);
            SkinName = name; DisplayName = name; truename = name;
            if (Server.Config.ClassicubeAccountPlus) name += "+";
            
            string mppass = NetUtils.ReadString(buffer, offset + 66);
            OnPlayerStartConnectingEvent.Call(this, mppass);
            if (cancelconnecting) { cancelconnecting = false; return size; }
            
            hasCpe  = buffer[offset + 130] == 0x42 && Server.Config.EnableCPE;
            level   = Server.mainLevel;
            Loading = true;
            if (Socket.Disconnected) return size;
            
            UpdateFallbackTable();
            if (hasCpe) { SendCpeExtensions(); } 
            else { CompleteLoginProcess(); }
            return size;
        }
        
        void SendCpeExtensions() {
            Send(Packet.ExtInfo((byte)(Extensions.Length + 1)));
            // fix for classicube java client, doesn't reply if only send EnvMapAppearance with version 2
            Send(Packet.ExtEntry(CpeExt.EnvMapAppearance, 1));
            
            foreach (CpeExtension ext in Extensions) 
            {
                Send(Packet.ExtEntry(ext.Name, ext.ServerVersion));
            }
        }
        
        void CompleteLoginProcess() {
            Player clone = null;
            OnPlayerFinishConnectingEvent.Call(this);
            if (cancelconnecting) { cancelconnecting = false; return; }
            
            lock (PlayerInfo.Online.locker) {
                // Check if any players online have same name
                Player[] players = PlayerInfo.Online.Items;
                foreach (Player pl in players) {
                    if (pl.truename == truename) { clone = pl; break; }
                }
                
                // Remove clone from list (hold lock for as short time as possible)
                if (clone != null && Server.Config.VerifyNames) PlayerInfo.Online.Remove(clone);
                id = NextFreeId();
                PlayerInfo.Online.Add(this);
            }
            
            if (clone != null && Server.Config.VerifyNames) {
                string reason = ip == clone.ip ? "(Reconnecting)" : "(Reconnecting from a different IP)";
                clone.Leave(reason);
            } else if (clone != null) {
                Leave(null, "Already logged in!", true); return;
            }

            SendRawMap(null, level);
            if (Socket.Disconnected) return;
            loggedIn = true;

            SessionStartTime = DateTime.UtcNow;
            LastLogin = DateTime.Now;
            TotalTime = TimeSpan.FromSeconds(1);
            GetPlayerStats();
            ShowWelcome();
            
            Server.Background.QueueOnce(ShowAltsTask, name, TimeSpan.Zero);
            CheckState();
            
            PlayerDB.LoadNick(this);
            Game.Team = Team.TeamIn(this);
            SetPrefix();
            LoadCpeData();
            
            if (Server.noEmotes.Contains(name)) { parseEmotes = !Server.Config.ParseEmotes; }

            hideRank = Rank;
            hidden   = CanUse("Hide") && Server.hidden.Contains(name);
            if (hidden) Message("&8Reminder: You are still hidden.");
            
            if (Chat.AdminchatPerms.UsableBy(Rank) && Server.Config.AdminsJoinSilently) {
                hidden = true; adminchat = true;                
            }

            OnPlayerConnectEvent.Call(this);
            if (cancellogin) { cancellogin = false; return; }
            
            string joinMsg = "&a+ λFULL &S" + PlayerDB.GetLoginMessage(this);
            if (hidden) joinMsg = "&8(hidden)" + joinMsg;
            
            if (Server.Config.GuestJoinsNotify || Rank > LevelPermission.Guest) {
                Chat.MessageFrom(ChatScope.All, this, joinMsg, null, Chat.FilterVisible(this), !hidden);
            }

            if (Server.Config.AgreeToRulesOnEntry && Rank == LevelPermission.Guest && !Server.agreed.Contains(name)) {
                Message("&9You must read the &c/Rules &9and &c/Agree &9to them before you can build and use commands!");
                agreed = false;
            }
            
            CheckIsUnverified();
            
            if (CanUse("Inbox") && Database.TableExists("Inbox" + name)) {
                int count = Database.CountRows("Inbox" + name);
                if (count > 0) {
                    Message("You have &a" + count + " &Smessages in &T/Inbox");
                }
            }
            
            if (Server.Config.PositionUpdateInterval > 1000)
                Message("Lowlag mode is currently &aON.");

            if (String.IsNullOrEmpty(appName)) {
                Logger.Log(LogType.UserActivity, "{0} [{1}] connected.", truename, IP);
            } else {
                Logger.Log(LogType.UserActivity, "{0} [{1}] connected using {2}.", truename, IP, appName);
            }
            
            PlayerActions.PostSentMap(this, null, level, false);
            Loading = false;
        }
        
        void ShowWelcome() {
            LastAction = DateTime.UtcNow;
            TextFile welcomeFile = TextFile.Files["Welcome"];
            
            try {
                welcomeFile.EnsureExists();
                string[] welcome = welcomeFile.GetText();
                MessageLines(welcome);
            } catch (Exception ex) {
                Logger.LogError("Error loading welcome text", ex);
            }
        }
        
        unsafe static byte NextFreeId() {
            byte* used = stackalloc byte[256];
            for (int i = 0; i < 256; i++) used[i] = 0;

            Player[] players = PlayerInfo.Online.Items;
            for (int i = 0; i < players.Length; i++) {
                byte id = players[i].id;
                used[id] = 1;
            }
            
            for (byte i = 0; i < 255; i++ ) {
                if (used[i] == 0) return i;
            }
            return 1;
        }
        
        void LoadCpeData() {
            string skin = Server.skins.FindData(name);
            if (skin != null) SkinName = skin;           
            string model = Server.models.FindData(name);
            if (model != null) Model = model;

            string modelScales = Server.modelScales.FindData(name);
            if (modelScales != null) {
                string[] bits = modelScales.SplitSpaces(3);
                Utils.TryParseSingle(bits[0], out ScaleX);
                Utils.TryParseSingle(bits[1], out ScaleY);
                Utils.TryParseSingle(bits[2], out ScaleZ);
            }            

            string rotations = Server.rotations.FindData(name);
            if (rotations != null) {
                string[] bits = rotations.SplitSpaces(2);
                Orientation rot = Rot;
                byte.TryParse(bits[0], out rot.RotX);
                byte.TryParse(bits[1], out rot.RotZ);
                Rot = rot;
            }            
            SetModel(Model);
        }
        
        void GetPlayerStats() {
            object raw = Database.ReadRows("Players", "*", null, PlayerData.Read,
                                           "WHERE Name=@0", name);
            if (raw == null) {
                PlayerData.Create(this);
                Chat.MessageFrom(this, "λNICK &Shas connected for the first time!");
                Message("Welcome " + ColoredName + "&S! This is your first visit.");
            } else {
                ((PlayerData)raw).ApplyTo(this);
                Message("Welcome back " + FullName + "&S! You've been here " + TimesVisited + " times!");
            }
            gotSQLData = true;
        }
        
        void CheckState() {
            if (Server.muted.Contains(name)) {
                muted = true;
                Chat.MessageFrom(this, "λNICK &Wis still muted from previously.");
            }
            
            if (Server.frozen.Contains(name)) {
                frozen = true;
                Chat.MessageFrom(this, "λNICK &Wis still frozen from previously.");
            }
        }
        
        static void ShowAltsTask(SchedulerTask task) {
            string name = (string)task.State;
            Player p    = PlayerInfo.FindExact(name);
            if (p == null || p.Socket.Disconnected) return;
            
            // Server host is exempt from alt listing
            if (IPAddress.IsLoopback(p.IP)) return;
            
            List<string> alts = PlayerInfo.FindAccounts(p.ip);
            // in older versions it was possible for your name to appear multiple times in DB
            while (alts.CaselessRemove(p.name)) { }
            if (alts.Count == 0) return;
            
            ItemPerms opchat = Chat.OpchatPerms;
            string altsMsg = "λNICK &Sis lately known as: " + alts.Join();

            Chat.MessageFrom(p, altsMsg,
                             (pl, obj) => pl.CanSee(p) && opchat.UsableBy(pl.Rank));
                         
            //IRCBot.Say(temp, true); //Tells people in op channel on IRC
            altsMsg = altsMsg.Replace("λNICK", name);
            Logger.Log(LogType.UserActivity, altsMsg);
        }
    }
}