Implement player death message limits

The code now includes player death message limits, with a configured maximum number of messages per defined period. This was added in the PlayerListener class and configuration options were placed in Config.java. This change will restrict spamming of death messages.

galaxy/src/main/java/com/alttd/chat/listeners/PlayerListener.java

@@ -17,9 +17,14 @@ import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.SignChangeEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
 
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.HashMap;
+import java.util.Stack;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
 
@@ -86,4 +91,22 @@ public class PlayerListener implements Listener {
         }
     }
 
+    private final HashMap<UUID, Stack<Instant>> sendPlayerDeaths = new HashMap<>();
+    @EventHandler(ignoreCancelled = true)
+    public void onPlayerDeath(PlayerDeathEvent event) {
+        UUID uuid = event.getPlayer().getUniqueId();
+        Stack<Instant> playerDeathsStack = sendPlayerDeaths.computeIfAbsent(uuid, key -> new Stack<>());
+        Instant cutOff = Instant.now().minus(Config.DEATH_MESSAGES_LIMIT_PERIOD_MINUTES, ChronoUnit.MINUTES);
+
+        while (playerDeathsStack.peek().isBefore(cutOff)) {
+            playerDeathsStack.pop();
+        }
+
+        if (playerDeathsStack.size() > Config.DEATH_MESSAGES_MAX_PER_PERIOD) {
+            event.deathMessage(Component.empty());
+            return;
+        }
+        playerDeathsStack.push(Instant.now());
+    }
+
 }