Support InstantdMOTD CPE extension, to allow /wset motd to apply instantly.

Author: UnknownShadow200

fCraft/Commands/WorldCommands.cs

@@ -3023,8 +3023,13 @@ static void SetMOTD(Player player, World world, string value) {
 
             Player[] players = world.Players;
             foreach (Player pl in players) {
-                if (!pl.Supports(CpeExt.HackControl)) continue;
-                pl.Send(PlayerHacks.MakePacket(pl, world.MOTD));
+                if (pl.Supports(CpeExt.HackControl)) {
+                    pl.Send(PlayerHacks.MakePacket(pl, world.MOTD));
+                }
+                if (pl.Supports(CpeExt.InstantMOTD)) {
+                    string motd = world.MOTD ?? "";
+                    pl.Send(Packet.MakeHandshake(pl, ConfigKey.ServerName.GetString(), motd));
+                }
             }
             WorldManager.SaveWorldList();
         }

fCraft/Network/CpeConstants.cs

@@ -104,6 +104,9 @@ public enum CpeExt
 
         /// <summary> Allows hiding blocks from and reordering blocks in the inventory. </summary>
         InventoryOrder,
+        
+        /// <summary> Allows sending motd/handshake packets, without also needing to resend world. </summary>
+        InstantMOTD,
     }
 
 

fCraft/Network/Packet.cs

@@ -49,11 +49,11 @@ public Packet( [NotNull] byte[] rawBytes ) {
         /// <param name="player"> Player to whom this packet is being sent.
         /// Used to determine DeleteAdmincrete permission, for client-side checks. May not be null. </param>
         /// <param name="motd"> Message-of-the-day (text displayed below the server name). May not be null. </param>
-        /// <param name="hasCP437"> Whether client supports extended code page 437 characters. </param>
         /// <exception cref="ArgumentNullException"> player, serverName, or motd is null </exception>
-        public static Packet MakeHandshake( [NotNull] Player player, [NotNull] string serverName, [NotNull] string motd, bool hasCP437 ) {
+        public static Packet MakeHandshake( [NotNull] Player player, [NotNull] string serverName, [NotNull] string motd ) {
             if( serverName == null ) throw new ArgumentNullException( "serverName" );
             if( motd == null ) throw new ArgumentNullException( "motd" );
+            bool hasCP437 = player.HasCP437;
 
             Packet packet = new Packet( OpCode.Handshake );
             //Logger.Log(LogType.Debug, "Send: MakeHandshake({0}, {1}, {2})", player, serverName, motd);

fCraft/Network/Player.Handshake.cs

@@ -375,6 +375,9 @@ bool NegotiateProtocolExtension() {
                     case InventoryOrderExtName:
                         if (version == 1) ext = CpeExt.InventoryOrder;
                         break;
+                    case InstantMOTDExtName:
+                        if (version == 1) ext = CpeExt.InstantMOTD;
+                        break;
                 }
                 if (ext != CpeExt.None)
                     supportedExts.Add(ext);

fCraft/Network/Player.Networking.cs

@@ -753,7 +753,7 @@ bool LoginSequence()
             if (ConfigKey.PaidPlayersOnly.Enabled() && Info.AccountType != AccountType.Paid)
             {
                 SendNow(Packet.MakeHandshake(this, ConfigKey.ServerName.GetString(),
-                                               "Please wait; Checking paid status...", HasCP437));
+                                               "Please wait; Checking paid status..."));
                 writer.Flush();
 
                 Info.AccountType = CheckPaidStatus(Name);
@@ -833,7 +833,7 @@ bool LoginSequence()
                     motd = "&0=&c=&e= " + motd + " &e=&c=&0=";
                 }
             }
-            SendNow(Packet.MakeHandshake(this, serverName, motd, HasCP437));
+            SendNow(Packet.MakeHandshake(this, serverName, motd));
 
             // AutoRank
             if (ConfigKey.AutoRankEnabled.Enabled())
@@ -1106,7 +1106,7 @@ internal bool JoinWorldNow([NotNull] World newWorld, bool doUseWorldSpawn, World
 
             // Start sending over the level copy
             if (oldWorld != null) {
-                SendNow(Packet.MakeHandshake(this, textLine1, textLine2, HasCP437));
+                SendNow(Packet.MakeHandshake(this, textLine1, textLine2));
             }
 
             if (Supports(CpeExt.BlockPermissions))

fCraft/Player/Player.cs

@@ -2151,6 +2151,7 @@ public void ResetIdleTimer()
         const string EntityPropertyExtName = "EntityProperty";
         const string TwoWayPingExtName = "TwoWayPing";
         const string InventoryOrderExtName = "InventoryOrder";
+        const string InstantMOTDExtName = "InstantMOTD";
 
         bool supportsBlockDefs, supportsCustomBlocks;
         internal bool supportsExtPositions;