Add option to consider use of an item as a block use at the player's feet.

Closes WORLDGUARD-3151.

src/main/java/com/sk89q/worldguard/bukkit/WorldConfiguration.java

@@ -182,6 +182,7 @@ public class WorldConfiguration {
     public boolean disableObsidianGenerators;
     public boolean strictEntitySpawn;
     public TargetMatcherSet allowAllInteract;
+    public TargetMatcherSet blockUseAtFeet;
 
     private Map<String, Integer> maxRegionCounts;
 
@@ -346,6 +347,7 @@ private void loadConfiguration() {
 
         strictEntitySpawn = getBoolean("event-handling.block-entity-spawns-with-untraceable-cause", false);
         allowAllInteract = getTargetMatchers("event-handling.interaction-whitelist");
+        blockUseAtFeet = getTargetMatchers("event-handling.emit-block-use-at-feet");
 
         itemDurability = getBoolean("protection.item-durability", true);
         removeInfiniteStacks = getBoolean("protection.remove-infinite-stacks", false);

src/main/java/com/sk89q/worldguard/bukkit/listener/EventAbstractionListener.java

@@ -392,6 +392,16 @@ public void onPlayerInteract(PlayerInteractEvent event) {
                     event.setUseItemInHand(Result.DENY);
                 }
 
+                // Check for items that the administrator has configured to
+                // emit a "use block here" event where the player is
+                // standing, which is a hack to protect items that don't
+                // throw events
+                if (item != null && getWorldConfig(player.getWorld()).blockUseAtFeet.test(item)) {
+                    if (Events.fireAndTestCancel(new UseBlockEvent(event, cause, player.getLocation().getBlock()))) {
+                        event.setCancelled(true);
+                    }
+                }
+
                 break;
         }
     }