when redstone torches or TNT were attempted to be placed in protected territory but prevented, it could previously still trigger a TNT explosion due to a longstanding unfixed CraftBukkit exploit. A workaround is now in place to prevent this, and any such attempts are logged and announced to everyone on the server.

For reference: https://bukkit.atlassian.net/browse/BUKKIT-89

src/com/massivecraft/factions/listeners/FactionsBlockListener.java

@@ -1,6 +1,7 @@
 package com.massivecraft.factions.listeners;
 
 import org.bukkit.Location;
+import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
 import org.bukkit.event.block.BlockBreakEvent;
@@ -93,6 +94,13 @@ public class FactionsBlockListener extends BlockListener
 		if ( ! playerCanBuildDestroyBlock(event.getPlayer(), event.getBlock(), "build", false))
 		{
 			event.setCancelled(true);
+
+			Material handItem = event.getPlayer().getItemInHand().getType();
+			if (handItem == Material.TNT || handItem == Material.REDSTONE_TORCH_ON)
+			{
+				Faction targetFaction = Board.getFactionAt(new FLocation(event.getBlock()));
+				FactionsEntityListener.trackPotentialExplosionExploit(event.getPlayer().getName(), targetFaction, handItem, event.getBlock().getLocation());
+			}
 		}
 	}
 

src/com/massivecraft/factions/listeners/FactionsChatEarlyListener.java

@@ -50,13 +50,13 @@ public class FactionsChatEarlyListener extends PlayerListener
 			String message = String.format(Conf.factionChatFormat, me.describeTo(myFaction), msg);
 			myFaction.sendMessage(message);
 			
-			P.p.log(Level.INFO, ChatColor.stripColor("FactionChat "+me.getFaction().getTag()+": "+message));
+			P.p.log(Level.INFO, ChatColor.stripColor("FactionChat "+myFaction.getTag()+": "+message));
 			
 			//Send to any players who are spying chat
 			for (FPlayer fplayer : FPlayers.i.getOnline())
 			{
 				if(fplayer.isSpyingChat() && fplayer.getFaction() != myFaction)
-					fplayer.sendMessage("[FCspy] "+me.getFaction().getTag()+": "+message);	
+					fplayer.sendMessage("[FCspy] "+myFaction.getTag()+": "+message);	
 			}
 			
 			event.setCancelled(true);

src/com/massivecraft/factions/listeners/FactionsEntityListener.java

@@ -1,12 +1,16 @@
 package com.massivecraft.factions.listeners;
 
 import java.text.MessageFormat;
+import java.util.ArrayList;
+import java.util.logging.Level;
 
 import org.bukkit.Location;
+import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Player;
 import org.bukkit.entity.Projectile;
+import org.bukkit.entity.TNTPrimed;
 import org.bukkit.event.entity.CreatureSpawnEvent;
 import org.bukkit.event.entity.EndermanPickupEvent;
 import org.bukkit.event.entity.EndermanPlaceEvent;
@@ -39,7 +43,9 @@ public class FactionsEntityListener extends EntityListener
 	{
 		this.p = p;
 	}
-	
+
+	private static ArrayList<PotentialExplosionExploit> exploitExplosions = new ArrayList<PotentialExplosionExploit>();
+
 	@Override
 	public void onEntityDeath(EntityDeathEvent event)
 	{
@@ -91,7 +97,41 @@ public class FactionsEntityListener extends EntityListener
 	public void onEntityExplode(EntityExplodeEvent event)
 	{
 		if ( event.isCancelled()) return;
-		
+
+		if (event.getEntity() instanceof TNTPrimed && exploitExplosions.size() > 0)
+		{	// make sure this isn't a TNT explosion exploit attempt
+			int locX = event.getLocation().getBlockX();
+			int locZ = event.getLocation().getBlockZ();
+
+			for (int i = exploitExplosions.size() - 1; i >= 0; i--)
+			{
+				PotentialExplosionExploit ex = exploitExplosions.get(i);
+
+				// remove anything from the list older than 10 seconds (TNT takes 4 seconds to trigger; provide some leeway)
+				if (ex.timeMillis + 10000 < System.currentTimeMillis())
+				{
+					exploitExplosions.remove(i);
+					continue;
+				}
+
+				int absX = Math.abs(ex.X - locX);
+				int absZ = Math.abs(ex.Z - locZ);
+				if (absX < 5 && absZ < 5) 
+				{	// it sure looks like an exploit attempt
+					// let's tattle on him to everyone
+					String msg = "NOTICE: Player \""+ex.playerName+"\" attempted to exploit a TNT bug in the territory of \""+ex.faction.getTag()+"\" at "+ex.X+","+ex.Z+" (X,Z) using "+ex.item.name();
+					P.p.log(Level.WARNING, msg);
+					for (FPlayer fplayer : FPlayers.i.getOnline())
+					{
+						fplayer.sendMessage(msg);
+					}
+					event.setCancelled(true);
+					exploitExplosions.remove(i);
+					return;
+				}
+			}
+		}
+
 		for (Block block : event.blockList())
 		{
 			Faction faction = Board.getFactionAt(new FLocation(block));
@@ -321,4 +361,38 @@ public class FactionsEntityListener extends EntityListener
 		
 		event.setCancelled(true);
 	}
+
+
+	/**
+	 * Since the Bukkit team still don't seem to be in any hurry to fix the problem after at least half a year,
+	 * we'll track potential explosion exploits ourselves and try to prevent them
+	 * For reference, canceled TNT placement next to redstone power is bugged and triggers a free explosion
+	 * Same thing happens for canceled redstone torch placement next to existing TNT
+	 * https://bukkit.atlassian.net/browse/BUKKIT-89
+	 */
+
+	public static void trackPotentialExplosionExploit(String playerName, Faction faction, Material item, Location location)
+	{
+		exploitExplosions.add(new PotentialExplosionExploit(playerName, faction, item, location));
+	}
+
+	public static class PotentialExplosionExploit
+	{
+		public String playerName;
+		public Faction faction;
+		public Material item;
+		public long timeMillis;
+		public int X;
+		public int Z;
+		
+		public PotentialExplosionExploit(String playerName, Faction faction, Material item, Location location)
+		{
+			this.playerName = playerName;
+			this.faction = faction;
+			this.item = item;
+			this.timeMillis = System.currentTimeMillis();
+			this.X = location.getBlockX();
+			this.Z = location.getBlockZ();
+		}
+	}
 }