fix(rooms): bound room item inputs

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/AdvertisingSaveEvent.java

@@ -18,7 +18,11 @@ public class AdvertisingSaveEvent extends MessageHandler {
         if (!room.hasRights(this.client.getHabbo()))
             return;
 
-        HabboItem item = room.getHabboItem(this.packet.readInt());
+        int itemId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
+        HabboItem item = room.getHabboItem(itemId);
         if (item == null)
             return;
 
@@ -29,9 +33,15 @@ public class AdvertisingSaveEvent extends MessageHandler {
         if (item instanceof InteractionCustomValues) {
             THashMap<String, String> oldValues = new THashMap<>(((InteractionCustomValues) item).values);
             int count = this.packet.readInt();
+            if (!RoomItemInputGuard.isValidCustomValueCount(count))
+                return;
+
             for (int i = 0; i < count / 2; i++) {
-                String key = this.packet.readString();
-                String value = this.packet.readString();
+                String key = RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_CUSTOM_KEY_LENGTH);
+                String value = RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_CUSTOM_VALUE_LENGTH);
+
+                if (key.isEmpty())
+                    continue;
 
                 if (!Emulator.getConfig().getBoolean("camera.use.https")) {
                     value = value.replace("https://", "http://");

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/FootballGateSaveLookEvent.java

@@ -13,15 +13,21 @@ public class FootballGateSaveLookEvent extends MessageHandler {
         if (room == null || this.client.getHabbo().getHabboInfo().getId() != room.getOwnerId())
             return;
 
-        HabboItem item = room.getHabboItem(this.packet.readInt());
+        int itemId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
+        HabboItem item = room.getHabboItem(itemId);
         if (!(item instanceof InteractionFootballGate))
             return;
 
         String gender = this.packet.readString();
-        String look = this.packet.readString();
+        String look = RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_LOOK_LENGTH);
+
+        if (!RoomItemInputGuard.isValidGender(gender) || look.isEmpty())
+            return;
 
         switch (gender.toLowerCase()) {
-            default:
             case "m":
                 ((InteractionFootballGate) item).setFigureM(look);
                 room.updateItem(item);
@@ -33,4 +39,4 @@ public class FootballGateSaveLookEvent extends MessageHandler {
                 break;
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/MannequinSaveLookEvent.java

@@ -15,7 +15,11 @@ public class MannequinSaveLookEvent extends MessageHandler {
         if (room == null || !room.isOwner(habbo))
             return;
 
-        HabboItem item = room.getHabboItem(this.packet.readInt());
+        int itemId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
+        HabboItem item = room.getHabboItem(itemId);
         if (item == null)
             return;
 

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/MannequinSaveNameEvent.java

@@ -12,12 +12,16 @@ public class MannequinSaveNameEvent extends MessageHandler {
         if (room == null || !room.isOwner(this.client.getHabbo()))
             return;
 
-        HabboItem item = room.getHabboItem(this.packet.readInt());
+        int itemId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
+        HabboItem item = room.getHabboItem(itemId);
         if (item == null)
             return;
 
         String[] data = item.getExtradata().split(":");
-        String name = this.packet.readString();
+        String name = RoomItemInputGuard.trimToMax(this.packet.readString(), 32);
 
         if (name.length() < 3 || name.length() > 15) {
             name = Emulator.getTexts().getValue("hotel.mannequin.name.default", "My look");

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/MoodLightSaveSettingsEvent.java

@@ -21,6 +21,9 @@ public class MoodLightSaveSettingsEvent extends MessageHandler {
     public void handle() throws Exception {
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
+        if (room == null)
+            return;
+
         if ((room.getGuildId() <= 0 && room.getGuildRightLevel(this.client.getHabbo()).isLessThan(RoomRightLevels.GUILD_RIGHTS)) && !room.hasRights(this.client.getHabbo()))
             return;
 

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/MoveWallItemEvent.java

@@ -25,7 +25,7 @@ public class MoveWallItemEvent extends MessageHandler {
         int itemId = this.packet.readInt();
         String wallPosition = this.packet.readString();
 
-        if (itemId <= 0 || wallPosition.length() <= 13)
+        if (!RoomItemInputGuard.isPositiveId(itemId) || wallPosition.length() <= 13)
             return;
 
         HabboItem item = room.getHabboItem(itemId);

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/PostItDeleteEvent.java

@@ -15,6 +15,9 @@ public class PostItDeleteEvent extends MessageHandler {
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room == null)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/PostItPlaceEvent.java

@@ -19,6 +19,9 @@ public class PostItPlaceEvent extends MessageHandler {
         int itemId = this.packet.readInt();
         String location = this.packet.readString();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId) || location.length() <= 13)
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room != null) {

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/PostItSaveDataEvent.java

@@ -20,6 +20,9 @@ public class PostItSaveDataEvent extends MessageHandler {
         String color = this.packet.readString();
         String text = Emulator.getGameEnvironment().getWordFilter().filter(this.packet.readString().replace(((char) 9) + "", ""), this.client.getHabbo());
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         if (text.length() > Emulator.getConfig().getInt("postit.charlimit")) {
             ScripterManager.scripterDetected(this.client, Emulator.getTexts().getValue("scripter.warning.sticky.size").replace("%username%", this.client.getHabbo().getHabboInfo().getUsername()).replace("%amount%", text.length() + "").replace("%limit%", Emulator.getConfig().getInt("postit.charlimit") + ""));
             return;

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RedeemClothingEvent.java

@@ -26,6 +26,9 @@ public class RedeemClothingEvent extends MessageHandler {
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         if (this.client.getHabbo().getHabboInfo().getCurrentRoom() != null &&
                 this.client.getHabbo().getHabboInfo().getCurrentRoom().hasRights(this.client.getHabbo())) {
             HabboItem item = this.client.getHabbo().getHabboInfo().getCurrentRoom().getHabboItem(itemId);
@@ -42,6 +45,10 @@ public class RedeemClothingEvent extends MessageHandler {
 
                             item.setRoomId(0);
                             RoomTile tile = this.client.getHabbo().getHabboInfo().getCurrentRoom().getLayout().getTile(item.getX(), item.getY());
+                            if (tile == null) {
+                                return;
+                            }
+
                             this.client.getHabbo().getHabboInfo().getCurrentRoom().removeHabboItem(item);
                             this.client.getHabbo().getHabboInfo().getCurrentRoom().updateTile(tile);
                             this.client.getHabbo().getHabboInfo().getCurrentRoom().sendComposer(new UpdateStackHeightComposer(tile.x, tile.y, tile.z, tile.relativeHeight()).compose());

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RedeemItemEvent.java

@@ -19,6 +19,9 @@ public class RedeemItemEvent extends MessageHandler {
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room != null) {
@@ -98,6 +101,9 @@ public class RedeemItemEvent extends MessageHandler {
                     room.removeHabboItem(item);
                     room.sendComposer(new RemoveFloorItemComposer(item).compose());
                     RoomTile t = room.getLayout().getTile(item.getX(), item.getY());
+                    if (t == null)
+                        return;
+
                     t.setStackHeight(room.getStackHeight(item.getX(), item.getY(), false));
                     room.updateTile(t);
                     room.sendComposer(new UpdateStackHeightComposer(item.getX(), item.getY(), t.z, t.relativeHeight()).compose());
@@ -124,4 +130,4 @@ public class RedeemItemEvent extends MessageHandler {
             }
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RoomItemInputGuard.java

@@ -0,0 +1,51 @@
+package com.eu.habbo.messages.incoming.rooms.items;
+
+public final class RoomItemInputGuard {
+    public static final int MAX_CUSTOM_VALUE_PAIRS = 20;
+    public static final int MAX_CUSTOM_KEY_LENGTH = 64;
+    public static final int MAX_CUSTOM_VALUE_LENGTH = 512;
+    public static final int MAX_LOOK_LENGTH = 512;
+    public static final int MAX_YOUTUBE_PLAYLIST_ID_LENGTH = 128;
+    public static final int MAX_STICKY_POLE_COMMANDS = 10;
+    public static final int MAX_STICKY_POLE_COMMAND_LENGTH = 255;
+
+    private RoomItemInputGuard() {
+    }
+
+    public static boolean isPositiveId(int id) {
+        return id > 0;
+    }
+
+    public static boolean isValidCustomValueCount(int count) {
+        return count > 0 && count % 2 == 0 && count / 2 <= MAX_CUSTOM_VALUE_PAIRS;
+    }
+
+    public static String trimToMax(String value, int maxLength) {
+        if (value == null) {
+            return "";
+        }
+
+        String trimmed = value.trim();
+        return trimmed.length() > maxLength ? trimmed.substring(0, maxLength) : trimmed;
+    }
+
+    public static boolean isValidGender(String gender) {
+        return "m".equalsIgnoreCase(gender) || "f".equalsIgnoreCase(gender);
+    }
+
+    public static Integer parseInt(String value) {
+        try {
+            return Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+
+    public static Short parseShort(String value) {
+        try {
+            return Short.parseShort(value);
+        } catch (NumberFormatException e) {
+            return null;
+        }
+    }
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RoomPickupItemEvent.java

@@ -12,6 +12,9 @@ public class RoomPickupItemEvent extends MessageHandler {
         this.packet.readInt(); //10 = floorItem and 20 = wallItem
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room == null)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RoomPlaceItemEvent.java

@@ -18,9 +18,12 @@ public class RoomPlaceItemEvent extends MessageHandler {
     public void handle() throws Exception {
         String[] values = this.packet.readString().split(" ");
 
-        int itemId = -1;
+        if (values.length == 0)
+            return;
 
-        if (values.length != 0) itemId = Integer.parseInt(values[0]);
+        Integer itemId = RoomItemInputGuard.parseInt(values[0]);
+        if (itemId == null || !RoomItemInputGuard.isPositiveId(itemId))
+            return;
 
         if (!this.client.getHabbo().getRoomUnit().isInRoom()) {
             this.client.sendResponse(new BubbleAlertComposer(BubbleAlertKeys.FURNITURE_PLACEMENT_ERROR.key, FurnitureMovementError.NO_RIGHTS.errorCode));
@@ -56,9 +59,15 @@ public class RoomPlaceItemEvent extends MessageHandler {
         }
 
         if (item.getBaseItem().getType() == FurnitureType.FLOOR) {
-            short x = Short.parseShort(values[1]);
-            short y = Short.parseShort(values[2]);
-            int rotation = Integer.parseInt(values[3]);
+            if (values.length < 4)
+                return;
+
+            Short x = RoomItemInputGuard.parseShort(values[1]);
+            Short y = RoomItemInputGuard.parseShort(values[2]);
+            Integer rotation = RoomItemInputGuard.parseInt(values[3]);
+
+            if (x == null || y == null || rotation == null)
+                return;
 
             RoomTile tile = room.getLayout().getTile(x, y);
 
@@ -108,6 +117,9 @@ public class RoomPlaceItemEvent extends MessageHandler {
                 return;
             }
         } else {
+            if (values.length < 4)
+                return;
+
             FurnitureMovementError error = room.placeWallFurniAt(item, values[1] + " " + values[2] + " " + values[3], this.client.getHabbo());
             if (!error.equals(FurnitureMovementError.NONE)) {
                 this.client.sendResponse(new BubbleAlertComposer(BubbleAlertKeys.FURNITURE_PLACEMENT_ERROR.key, error.errorCode));

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/RotateMoveItemEvent.java

@@ -16,6 +16,8 @@ public class RotateMoveItemEvent extends MessageHandler {
         if (room == null) return;
 
         int furniId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(furniId)) return;
+
         HabboItem item = room.getHabboItem(furniId);
         if (item == null) return;
 
@@ -39,4 +41,4 @@ public class RotateMoveItemEvent extends MessageHandler {
             this.client.sendResponse(new FloorItemUpdateComposer(item));
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/SavePostItStickyPoleEvent.java

@@ -24,9 +24,14 @@ public class SavePostItStickyPoleEvent extends MessageHandler {
         if (itemId == -1234) {
             if (this.client.getHabbo().hasPermission("cmd_multi")) {
                 String[] commands = this.packet.readString().split("\r");
+                if (commands.length > RoomItemInputGuard.MAX_STICKY_POLE_COMMANDS)
+                    return;
 
                 for (String command : commands) {
-                    command = command.replace("<br>", "\r");
+                    command = RoomItemInputGuard.trimToMax(command.replace("<br>", "\r"), RoomItemInputGuard.MAX_STICKY_POLE_COMMAND_LENGTH);
+                    if (command.isEmpty())
+                        continue;
+
                     CommandHandler.handleCommand(this.client, command);
                 }
             } else {
@@ -38,6 +43,9 @@ public class SavePostItStickyPoleEvent extends MessageHandler {
             if (text.length() > Emulator.getConfig().getInt("postit.charlimit"))
                 return;
 
+            if (!RoomItemInputGuard.isPositiveId(itemId))
+                return;
+
             Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
             if (room == null)
                 return;

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/ToggleFloorItemEvent.java

@@ -41,6 +41,9 @@ public class ToggleFloorItemEvent extends MessageHandler {
             int itemId = this.packet.readInt();
             int state = this.packet.readInt();
 
+            if (!RoomItemInputGuard.isPositiveId(itemId))
+                return;
+
             HabboItem item = room.getHabboItem(itemId);
 
             if (item == null || item instanceof InteractionDice)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/ToggleWallItemEvent.java

@@ -24,6 +24,9 @@ public class ToggleWallItemEvent extends MessageHandler {
         int itemId = this.packet.readInt();
         int state = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         HabboItem item = room.getHabboItem(itemId);
 
         if (item == null)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/UpdateFurniturePositionEvent.java

@@ -20,6 +20,8 @@ public class UpdateFurniturePositionEvent extends MessageHandler {
         if (room == null) return;
 
         int furniId = this.packet.readInt();
+        if (!RoomItemInputGuard.isPositiveId(furniId)) return;
+
         HabboItem item = room.getHabboItem(furniId);
         if (item == null) return;
 

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/jukebox/JukeBoxAddSoundTrackEvent.java

@@ -1,26 +1,32 @@
 package com.eu.habbo.messages.incoming.rooms.items.jukebox;
 
 import com.eu.habbo.habbohotel.items.interactions.InteractionMusicDisc;
+import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.habbohotel.users.Habbo;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 
 public class JukeBoxAddSoundTrackEvent extends MessageHandler {
     @Override
     public void handle() throws Exception {
-        if (!this.client.getHabbo().getHabboInfo().getCurrentRoom().hasRights(this.client.getHabbo())) return;
+        Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
+        if (room == null || !room.hasRights(this.client.getHabbo())) return;
 
         int itemId = this.packet.readInt();
         this.packet.readInt(); // slotId
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Habbo habbo = this.client.getHabbo();
 
         if (habbo != null) {
             HabboItem item = habbo.getInventory().getItemsComponent().getHabboItem(itemId);
 
             if (item instanceof InteractionMusicDisc && item.getRoomId() == 0) {
-                this.client.getHabbo().getHabboInfo().getCurrentRoom().getTraxManager().addSong((InteractionMusicDisc) item, habbo);
+                room.getTraxManager().addSong((InteractionMusicDisc) item, habbo);
             }
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/jukebox/JukeBoxRemoveSoundTrackEvent.java

@@ -1,6 +1,7 @@
 package com.eu.habbo.messages.incoming.rooms.items.jukebox;
 
 import com.eu.habbo.habbohotel.items.interactions.InteractionMusicDisc;
+import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.messages.incoming.MessageHandler;
 
 public class JukeBoxRemoveSoundTrackEvent extends MessageHandler {
@@ -8,12 +9,16 @@ public class JukeBoxRemoveSoundTrackEvent extends MessageHandler {
     public void handle() throws Exception {
         int index = this.packet.readInt();
 
-        if (this.client.getHabbo().getHabboInfo().getCurrentRoom() == null) return;
+        Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
+        if (room == null) return;
 
-        InteractionMusicDisc musicDisc = this.client.getHabbo().getHabboInfo().getCurrentRoom().getTraxManager().getSongs().get(index);
+        if (index < 0 || index >= room.getTraxManager().getSongs().size())
+            return;
+
+        InteractionMusicDisc musicDisc = room.getTraxManager().getSongs().get(index);
 
         if (musicDisc != null) {
-            this.client.getHabbo().getHabboInfo().getCurrentRoom().getTraxManager().removeSong(musicDisc.getId());
+            room.getTraxManager().removeSong(musicDisc.getId());
         }
     }
 }

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/jukebox/JukeBoxRequestPlayListEvent.java

@@ -1,6 +1,7 @@
 package com.eu.habbo.messages.incoming.rooms.items.jukebox;
 
 import com.eu.habbo.habbohotel.rooms.TraxManager;
+import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.messages.incoming.MessageHandler;
 import com.eu.habbo.messages.outgoing.rooms.items.jukebox.JukeBoxMySongsComposer;
 import com.eu.habbo.messages.outgoing.rooms.items.jukebox.JukeBoxPlayListComposer;
@@ -8,9 +9,13 @@ import com.eu.habbo.messages.outgoing.rooms.items.jukebox.JukeBoxPlayListCompose
 public class JukeBoxRequestPlayListEvent extends MessageHandler {
     @Override
     public void handle() throws Exception {
-        TraxManager traxManager = this.client.getHabbo().getHabboInfo().getCurrentRoom().getTraxManager();
+        Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
+        if (room == null)
+            return;
+
+        TraxManager traxManager = room.getTraxManager();
         this.client.sendResponse(new JukeBoxPlayListComposer(traxManager.getSongs(), traxManager.totalLength()));
         this.client.sendResponse(new JukeBoxMySongsComposer(traxManager.myList(this.client.getHabbo())));
-        this.client.getHabbo().getHabboInfo().getCurrentRoom().getTraxManager().updateCurrentPlayingSong(this.client.getHabbo());
+        traxManager.updateCurrentPlayingSong(this.client.getHabbo());
     }
 }

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/lovelock/LoveLockStartConfirmEvent.java

@@ -4,6 +4,7 @@ import com.eu.habbo.habbohotel.items.interactions.InteractionLoveLock;
 import com.eu.habbo.habbohotel.users.Habbo;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 import com.eu.habbo.messages.outgoing.rooms.items.lovelock.LoveLockFurniFinishedComposer;
 import com.eu.habbo.messages.outgoing.rooms.items.lovelock.LoveLockFurniFriendConfirmedComposer;
 
@@ -12,6 +13,9 @@ public class LoveLockStartConfirmEvent extends MessageHandler {
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         if (this.packet.readBoolean()) {
             if (this.client.getHabbo().getHabboInfo().getCurrentRoom() == null)
                 return;

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/rentablespace/RentSpaceCancelEvent.java

@@ -5,12 +5,16 @@ import com.eu.habbo.habbohotel.permissions.Permission;
 import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 
 public class RentSpaceCancelEvent extends MessageHandler {
     @Override
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room == null)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/rentablespace/RentSpaceEvent.java

@@ -4,12 +4,16 @@ import com.eu.habbo.habbohotel.items.interactions.InteractionRentableSpace;
 import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 
 public class RentSpaceEvent extends MessageHandler {
     @Override
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         Room room = this.client.getHabbo().getHabboInfo().getCurrentRoom();
 
         if (room == null)

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/youtube/YoutubeRequestPlaylistChange.java

@@ -8,6 +8,7 @@ import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.habbohotel.users.Habbo;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 import com.eu.habbo.messages.outgoing.rooms.items.youtube.YoutubeVideoComposer;
 import com.eu.habbo.threading.runnables.YoutubeAdvanceVideo;
 
@@ -17,7 +18,10 @@ public class YoutubeRequestPlaylistChange extends MessageHandler {
     @Override
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
-        String playlistId = this.packet.readString();
+        String playlistId = RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_YOUTUBE_PLAYLIST_ID_LENGTH);
+
+        if (!RoomItemInputGuard.isPositiveId(itemId) || playlistId.isEmpty())
+            return;
 
         Habbo habbo = this.client.getHabbo();
 
@@ -30,13 +34,16 @@ public class YoutubeRequestPlaylistChange extends MessageHandler {
         if (!room.isOwner(habbo) && !habbo.hasPermission(Permission.ACC_ANYROOMOWNER)) return;
 
 
-        HabboItem item = this.client.getHabbo().getHabboInfo().getCurrentRoom().getHabboItem(itemId);
+        HabboItem item = room.getHabboItem(itemId);
 
         if (item == null || !(item instanceof  InteractionYoutubeTV)) return;
 
         Optional<YoutubeManager.YoutubePlaylist> playlist = Emulator.getGameEnvironment().getItemManager().getYoutubeManager().getPlaylistsForItemId(item.getId()).stream().filter(p -> p.getId().equals(playlistId)).findAny();
 
         if (playlist.isPresent()) {
+            if (playlist.get().getVideos().isEmpty())
+                return;
+
             YoutubeManager.YoutubeVideo video = playlist.get().getVideos().get(0);
             if (video == null) return;
 
@@ -52,4 +59,4 @@ public class YoutubeRequestPlaylistChange extends MessageHandler {
             item.needsUpdate(true);
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/youtube/YoutubeRequestPlaylists.java

@@ -5,6 +5,7 @@ import com.eu.habbo.habbohotel.items.YoutubeManager;
 import com.eu.habbo.habbohotel.items.interactions.InteractionYoutubeTV;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 import com.eu.habbo.messages.outgoing.handshake.ConnectionErrorComposer;
 import com.eu.habbo.messages.outgoing.rooms.items.youtube.YoutubeDisplayListComposer;
 import org.slf4j.Logger;
@@ -19,6 +20,9 @@ public class YoutubeRequestPlaylists extends MessageHandler {
     public void handle() throws Exception {
         int itemId = this.packet.readInt();
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         if (this.client.getHabbo().getHabboInfo().getCurrentRoom() != null) {
             HabboItem item = this.client.getHabbo().getHabboInfo().getCurrentRoom().getHabboItem(itemId);
 
@@ -38,4 +42,4 @@ public class YoutubeRequestPlaylists extends MessageHandler {
             }
         }
     }
-}
+}

Emulator/src/main/java/com/eu/habbo/messages/incoming/rooms/items/youtube/YoutubeRequestStateChange.java

@@ -7,6 +7,7 @@ import com.eu.habbo.habbohotel.rooms.Room;
 import com.eu.habbo.habbohotel.users.Habbo;
 import com.eu.habbo.habbohotel.users.HabboItem;
 import com.eu.habbo.messages.incoming.MessageHandler;
+import com.eu.habbo.messages.incoming.rooms.items.RoomItemInputGuard;
 import com.eu.habbo.messages.outgoing.rooms.items.youtube.YoutubeStateChangeComposer;
 import com.eu.habbo.messages.outgoing.rooms.items.youtube.YoutubeVideoComposer;
 import com.eu.habbo.threading.runnables.YoutubeAdvanceVideo;
@@ -49,6 +50,9 @@ public class YoutubeRequestStateChange extends MessageHandler {
         int itemId = this.packet.readInt();
         YoutubeState state = YoutubeState.getByState(this.packet.readInt());
 
+        if (!RoomItemInputGuard.isPositiveId(itemId))
+            return;
+
         if (state == null) return;
 
         Habbo habbo = this.client.getHabbo();
@@ -62,7 +66,7 @@ public class YoutubeRequestStateChange extends MessageHandler {
         if (!room.isOwner(habbo) && !habbo.hasPermission(Permission.ACC_ANYROOMOWNER)) return;
 
 
-        HabboItem item = this.client.getHabbo().getHabboInfo().getCurrentRoom().getHabboItem(itemId);
+        HabboItem item = room.getHabboItem(itemId);
 
         if (!(item instanceof InteractionYoutubeTV)) return;
 

Emulator/src/test/java/com/eu/habbo/messages/incoming/rooms/items/RoomItemInputGuardContractTest.java

@@ -0,0 +1,154 @@
+package com.eu.habbo.messages.incoming.rooms.items;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class RoomItemInputGuardContractTest {
+    private static String source(String name) throws Exception {
+        return Files.readString(Path.of("src/main/java/com/eu/habbo/messages/incoming/rooms/items/" + name + ".java"));
+    }
+
+    @Test
+    void itemMutationHandlersRejectInvalidIdsBeforeRoomLookups() throws Exception {
+        for (String handler : new String[]{"RoomPickupItemEvent", "RotateMoveItemEvent", "UpdateFurniturePositionEvent", "MoveWallItemEvent", "ToggleFloorItemEvent", "ToggleWallItemEvent", "AdvertisingSaveEvent", "MannequinSaveNameEvent", "MannequinSaveLookEvent", "FootballGateSaveLookEvent", "PostItSaveDataEvent", "PostItPlaceEvent", "PostItDeleteEvent"}) {
+            String source = source(handler);
+            int idRead = source.indexOf("this.packet.readInt()");
+            int guard = source.indexOf("RoomItemInputGuard.isPositiveId", idRead);
+            int lookup = source.indexOf("getHabboItem", guard);
+
+            assertTrue(guard > idRead, handler + " should validate item ids after reading them");
+            assertTrue(lookup == -1 || guard < lookup, handler + " should validate item ids before room item lookups");
+        }
+    }
+
+    @Test
+    void specialItemHandlersRejectInvalidIdsBeforeLookups() throws Exception {
+        for (String handler : new String[]{
+                "rentablespace/RentSpaceEvent",
+                "rentablespace/RentSpaceCancelEvent",
+                "lovelock/LoveLockStartConfirmEvent",
+                "youtube/YoutubeRequestPlaylistChange",
+                "youtube/YoutubeRequestPlaylists",
+                "youtube/YoutubeRequestStateChange",
+                "jukebox/JukeBoxAddSoundTrackEvent",
+                "RedeemItemEvent",
+                "RedeemClothingEvent"
+        }) {
+            String source = Files.readString(Path.of("src/main/java/com/eu/habbo/messages/incoming/rooms/items/" + handler + ".java"));
+            int idRead = source.indexOf("this.packet.readInt()");
+            int guard = source.indexOf("RoomItemInputGuard.isPositiveId", idRead);
+
+            assertTrue(guard > idRead, handler + " should validate item ids after reading them");
+        }
+    }
+
+    @Test
+    void roomPlacementParsesClientPayloadSafely() throws Exception {
+        String source = source("RoomPlaceItemEvent");
+
+        assertTrue(source.contains("RoomItemInputGuard.parseInt(values[0])"),
+                "item placement should parse item id without throwing on malformed packets");
+        assertTrue(source.contains("values.length < 4"),
+                "item placement should require complete coordinate payloads");
+        assertTrue(source.contains("RoomItemInputGuard.parseShort(values[1])"),
+                "floor placement should parse x coordinate safely");
+        assertTrue(source.contains("RoomItemInputGuard.parseShort(values[2])"),
+                "floor placement should parse y coordinate safely");
+        assertTrue(source.contains("RoomItemInputGuard.parseInt(values[3])"),
+                "floor placement should parse rotation safely");
+    }
+
+    @Test
+    void advertisingCustomValuesAreBoundedBeforeMutation() throws Exception {
+        String source = source("AdvertisingSaveEvent");
+
+        int count = source.indexOf("int count = this.packet.readInt()");
+        int guard = source.indexOf("RoomItemInputGuard.isValidCustomValueCount(count)", count);
+        int loop = source.indexOf("for (int i = 0; i < count / 2; i++)", guard);
+        int mutate = source.indexOf(".values.put(key, value)", loop);
+
+        assertTrue(guard > count && guard < loop,
+                "custom value pair count should be bounded before reading key/value pairs");
+        assertTrue(source.contains("RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_CUSTOM_KEY_LENGTH)"),
+                "custom value keys should be trimmed and capped");
+        assertTrue(source.contains("RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_CUSTOM_VALUE_LENGTH)"),
+                "custom value values should be trimmed and capped");
+        assertTrue(mutate > loop,
+                "custom values should only mutate after bounded reads");
+    }
+
+    @Test
+    void stickyPoleMultiCommandPayloadIsBounded() throws Exception {
+        String source = source("SavePostItStickyPoleEvent");
+
+        int split = source.indexOf("String[] commands = this.packet.readString().split");
+        int countGuard = source.indexOf("commands.length > RoomItemInputGuard.MAX_STICKY_POLE_COMMANDS", split);
+        int trim = source.indexOf("RoomItemInputGuard.trimToMax(command.replace", countGuard);
+        int execute = source.indexOf("CommandHandler.handleCommand", trim);
+
+        assertTrue(split > -1 && countGuard > split,
+                "sticky-pole multi-command packets should cap command count before looping");
+        assertTrue(trim > countGuard && trim < execute,
+                "sticky-pole multi-command packets should cap each command before execution");
+    }
+
+    @Test
+    void specialLookPayloadsAreValidatedBeforeMutation() throws Exception {
+        String football = source("FootballGateSaveLookEvent");
+        String mannequinName = source("MannequinSaveNameEvent");
+        String moodlight = source("MoodLightSaveSettingsEvent");
+
+        assertTrue(football.contains("RoomItemInputGuard.isValidGender(gender)"),
+                "football gates should reject unknown gender keys instead of defaulting to male");
+        assertTrue(football.contains("RoomItemInputGuard.trimToMax(this.packet.readString(), RoomItemInputGuard.MAX_LOOK_LENGTH)"),
+                "football gate looks should be capped before persistence");
+        assertTrue(mannequinName.contains("RoomItemInputGuard.trimToMax(this.packet.readString(), 32)"),
+                "mannequin names should be capped before extradata persistence");
+        assertTrue(moodlight.contains("if (room == null)"),
+                "moodlight saves should null-check current room before inspecting rights");
+    }
+
+    @Test
+    void youtubeAndJukeboxInputsAreBoundedBeforeListAccess() throws Exception {
+        String playlistChange = Files.readString(Path.of("src/main/java/com/eu/habbo/messages/incoming/rooms/items/youtube/YoutubeRequestPlaylistChange.java"));
+        String jukeboxRemove = Files.readString(Path.of("src/main/java/com/eu/habbo/messages/incoming/rooms/items/jukebox/JukeBoxRemoveSoundTrackEvent.java"));
+        String jukeboxRequest = Files.readString(Path.of("src/main/java/com/eu/habbo/messages/incoming/rooms/items/jukebox/JukeBoxRequestPlayListEvent.java"));
+
+        int playlistTrim = playlistChange.indexOf("RoomItemInputGuard.trimToMax");
+        int emptyVideos = playlistChange.indexOf("playlist.get().getVideos().isEmpty()");
+        int getFirst = playlistChange.indexOf("playlist.get().getVideos().get(0)");
+
+        assertTrue(playlistTrim > -1,
+                "youtube playlist ids should be capped before lookup");
+        assertTrue(emptyVideos > playlistTrim && emptyVideos < getFirst,
+                "youtube playlist changes should reject empty playlists before get(0)");
+        assertTrue(jukeboxRemove.contains("index < 0 || index >= room.getTraxManager().getSongs().size()"),
+                "jukebox remove should bound client-provided indexes before list access");
+        assertTrue(jukeboxRequest.contains("if (room == null)"),
+                "jukebox playlist requests should null-check current room");
+    }
+
+    @Test
+    void helperRejectsMalformedValues() {
+        assertFalse(RoomItemInputGuard.isPositiveId(0));
+        assertTrue(RoomItemInputGuard.isPositiveId(1));
+        assertFalse(RoomItemInputGuard.isValidCustomValueCount(0));
+        assertFalse(RoomItemInputGuard.isValidCustomValueCount(3));
+        assertTrue(RoomItemInputGuard.isValidCustomValueCount(RoomItemInputGuard.MAX_CUSTOM_VALUE_PAIRS * 2));
+        assertFalse(RoomItemInputGuard.isValidCustomValueCount((RoomItemInputGuard.MAX_CUSTOM_VALUE_PAIRS + 1) * 2));
+        assertEquals(123, RoomItemInputGuard.parseInt("123"));
+        assertNull(RoomItemInputGuard.parseInt("abc"));
+        assertEquals((short) 12, RoomItemInputGuard.parseShort("12"));
+        assertNull(RoomItemInputGuard.parseShort("40000"));
+        assertTrue(RoomItemInputGuard.isValidGender("m"));
+        assertTrue(RoomItemInputGuard.isValidGender("F"));
+        assertFalse(RoomItemInputGuard.isValidGender("x"));
+    }
+}