Outsource external checks for shop creation

Every supported plugin has its own listener for ShopCreateEvent
and ShopExtendEvent.

I also tried to clean up a bit, there can be done more though.

src/main/java/de/epiceric/shopchest/ShopChest.java

@@ -8,6 +8,12 @@ import de.epiceric.shopchest.config.HologramFormat;
 import de.epiceric.shopchest.event.ShopInitializedEvent;
 import de.epiceric.shopchest.external.PlotSquaredShopFlag;
 import de.epiceric.shopchest.external.WorldGuardShopFlag;
+import de.epiceric.shopchest.external.listeners.ASkyBlockListener;
+import de.epiceric.shopchest.external.listeners.GriefPreventionListener;
+import de.epiceric.shopchest.external.listeners.IslandWorldListener;
+import de.epiceric.shopchest.external.listeners.PlotSquaredListener;
+import de.epiceric.shopchest.external.listeners.TownyListener;
+import de.epiceric.shopchest.external.listeners.USkyBlockListener;
 import de.epiceric.shopchest.language.LanguageUtils;
 import de.epiceric.shopchest.listeners.AreaShopListener;
 import de.epiceric.shopchest.listeners.BlockExplodeListener;
@@ -196,6 +202,7 @@ public class ShopChest extends JavaPlugin {
                 5L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
 
         registerListeners();
+        registerExternalListeners();
         initializeShops();
 
         updater = new ShopUpdater(this);
@@ -393,6 +400,23 @@ public class ShopChest extends JavaPlugin {
         }
     }
 
+    private void registerExternalListeners() {
+        if (hasASkyBlock())
+            getServer().getPluginManager().registerEvents(new ASkyBlockListener(this), this);
+        if (hasGriefPrevention())
+            getServer().getPluginManager().registerEvents(new GriefPreventionListener(this), this);
+        if (hasIslandWorld())
+            getServer().getPluginManager().registerEvents(new IslandWorldListener(this), this);
+        if (hasPlotSquared())
+            getServer().getPluginManager().registerEvents(new PlotSquaredListener(this), this);
+        if (hasTowny())
+            getServer().getPluginManager().registerEvents(new TownyListener(this), this);
+        if (hasUSkyBlock())
+            getServer().getPluginManager().registerEvents(new USkyBlockListener(this), this);
+        if (hasWorldGuard())
+            getServer().getPluginManager().registerEvents(new de.epiceric.shopchest.external.listeners.WorldGuardListener(this), this);
+    }
+
     /**
      * Initializes the shops
      */

src/main/java/de/epiceric/shopchest/event/ShopExtendEvent.java

@@ -0,0 +1,37 @@
+package de.epiceric.shopchest.event;
+
+import de.epiceric.shopchest.shop.Shop;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+
+/**
+ * Called when a player extends a shop (making a chest a double chest)
+ */
+public class ShopExtendEvent extends ShopEvent implements Cancellable {
+    private boolean cancelled;
+    private Location newChestLocation;
+
+    public ShopExtendEvent(Player player, Shop shop, Location newChest) {
+        super(player, shop);
+        this.newChestLocation = newChest;
+    }
+
+    /**
+     * @return Location of the placed chest
+     */
+    public Location getNewChestLocation() {
+        return newChestLocation;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        cancelled = cancel;
+    }
+}

src/main/java/de/epiceric/shopchest/external/listeners/ASkyBlockListener.java

@@ -0,0 +1,62 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Set;
+
+import com.wasteofplastic.askyblock.ASkyBlockAPI;
+import com.wasteofplastic.askyblock.Island;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+
+public class ASkyBlockListener implements Listener {
+    private final ShopChest plugin;
+
+    public ASkyBlockListener(ShopChest plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableASkyblockIntegration)
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enableASkyblockIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e) {
+        Island island = ASkyBlockAPI.getInstance().getIslandAt(loc);
+        if (island == null) 
+            return false;
+
+        if (!player.getUniqueId().equals(island.getOwner()) && !island.getMembers().contains(player.getUniqueId())) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: ASkyBlock");
+            return true;
+        }
+
+        return false;
+    }
+    
+}

src/main/java/de/epiceric/shopchest/external/listeners/GriefPreventionListener.java

@@ -0,0 +1,62 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Set;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+import me.ryanhamshire.GriefPrevention.Claim;
+import me.ryanhamshire.GriefPrevention.GriefPrevention;
+
+public class GriefPreventionListener implements Listener {
+    private final ShopChest plugin;
+    private final GriefPrevention griefPrevention;
+
+    public GriefPreventionListener(ShopChest plugin) {
+        this.plugin = plugin;
+        this.griefPrevention = plugin.getGriefPrevention();
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableGriefPreventionIntegration)
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enableASkyblockIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e) {
+        Claim claim = griefPrevention.dataStore.getClaimAt(loc, false, null);
+        if (claim == null) 
+            return false;
+
+        if (claim.allowContainers(player) != null) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: GriefPrevention");
+            return true;
+        }
+
+        return false;
+    }
+}

src/main/java/de/epiceric/shopchest/external/listeners/IslandWorldListener.java

@@ -0,0 +1,59 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Set;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+import pl.islandworld.api.IslandWorldApi;
+
+public class IslandWorldListener implements Listener {
+    private final ShopChest plugin;
+
+    public IslandWorldListener(ShopChest plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableIslandWorldIntegration || !IslandWorldApi.isInitialized())
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enableIslandWorldIntegration || !IslandWorldApi.isInitialized())
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e) {
+        if (!loc.getWorld().getName().equals(IslandWorldApi.getIslandWorld().getName())) 
+            return false;
+
+        if (!IslandWorldApi.canBuildOnLocation(player, loc, true)) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: IslandWorld");
+            return true;
+        }
+
+        return false;
+    }
+    
+}

src/main/java/de/epiceric/shopchest/external/listeners/PlotSquaredListener.java

@@ -0,0 +1,80 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Set;
+
+import com.github.intellectualsites.plotsquared.plot.object.Location;
+import com.github.intellectualsites.plotsquared.plot.object.Plot;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.external.PlotSquaredShopFlag;
+import de.epiceric.shopchest.utils.Utils;
+
+public class PlotSquaredListener implements Listener {
+    private final ShopChest plugin;
+
+    public PlotSquaredListener(ShopChest plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enablePlotsquaredIntegration)
+            return;
+
+        Set<org.bukkit.Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (org.bukkit.Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enablePlotsquaredIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    // TODO: Outsource shop use external permission
+
+    // @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    // public void onBuySell(ShopBuySellEvent e) {
+    //     if (!Config.enablePlotsquaredIntegration)
+    //         return;
+            
+    //     ShopType shopType = e.getShop().getShopType();
+    //     GroupFlag flag = shopType == ShopType.ADMIN ? PlotSquaredShopFlag.USE_ADMIN_SHOP : PlotSquaredShopFlag.USE_SHOP;
+
+    //     Set<org.bukkit.Location> chestLocations = Utils.getChestLocations(e.getShop());
+    //     for (org.bukkit.Location loc : chestLocations) {
+    //         Location plotLocation = new Location(loc.getWorld().getName(), loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
+    //         Plot plot = plotLocation.getOwnedPlot();
+    //         if (!isFlagAllowed(plot, flag, e.getPlayer())) {
+    //             e.setCancelled(true);
+    //             plugin.debug("Cancel Reason: PlotSquared");
+    //             return;
+    //         }
+    //     }
+    // }
+
+    private boolean handleForLocation(Player player, org.bukkit.Location loc, Cancellable e) {
+        Location plotLocation = new Location(loc.getWorld().getName(), loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
+        Plot plot = plotLocation.getOwnedPlot();
+        if (!PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, PlotSquaredShopFlag.CREATE_SHOP, player)) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: PlotSquared");
+            return true;
+        }
+        return false;
+    }
+}

src/main/java/de/epiceric/shopchest/external/listeners/TownyListener.java

@@ -0,0 +1,84 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Optional;
+import java.util.Set;
+
+import com.palmergames.bukkit.towny.exceptions.NotRegisteredException;
+import com.palmergames.bukkit.towny.object.Resident;
+import com.palmergames.bukkit.towny.object.Town;
+import com.palmergames.bukkit.towny.object.TownBlock;
+import com.palmergames.bukkit.towny.object.TownyUniverse;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+
+public class TownyListener implements Listener {
+    private final ShopChest plugin;
+
+    public TownyListener(ShopChest plugin) {
+        this.plugin = plugin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableTownyIntegration)
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enablePlotsquaredIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e) {
+        TownBlock townBlock = TownyUniverse.getTownBlock(loc);
+        if (townBlock == null)
+            return false;
+
+        try {
+            Town town = townBlock.getTown();
+            Optional<Resident> playerResident = town.getResidents().stream()
+                    .filter(r -> r.getName().equals(player.getName()))
+                    .findFirst();
+                    
+            if (!playerResident.isPresent()) {
+                e.setCancelled(true);
+                plugin.debug("Cancel Reason: Towny (no resident)");
+                return true;
+            }
+
+            Resident resident = playerResident.get();
+            String plotType = townBlock.getType().name();
+            boolean cancel = (resident.isMayor() && !Config.townyShopPlotsMayor.contains(plotType))
+                    || (resident.isKing() && !Config.townyShopPlotsKing.contains(plotType))
+                    || (!resident.isKing() && !resident.isMayor() && !Config.townyShopPlotsResidents.contains(plotType));
+            
+            if (cancel) {
+                e.setCancelled(true);
+                plugin.debug("Cancel Reason: Towny (no permission)");
+                return true;
+            }
+        } catch (NotRegisteredException ignored) {
+        }
+        return false;
+    }
+}

src/main/java/de/epiceric/shopchest/external/listeners/USkyBlockListener.java

@@ -0,0 +1,61 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Set;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+import us.talabrek.ultimateskyblock.api.IslandInfo;
+import us.talabrek.ultimateskyblock.api.uSkyBlockAPI;
+
+public class USkyBlockListener implements Listener {
+    private final ShopChest plugin;
+    private final uSkyBlockAPI uSkyBlockAPI;
+
+    public USkyBlockListener(ShopChest plugin) {
+        this.plugin = plugin;
+        this.uSkyBlockAPI = plugin.getUSkyBlock();
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableUSkyblockIntegration)
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enablePlotsquaredIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e);
+    }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e) {
+        IslandInfo islandInfo = uSkyBlockAPI.getIslandInfo(loc);
+        if (islandInfo == null) 
+            return false;
+
+        if (!player.getName().equals(islandInfo.getLeader()) && !islandInfo.getMembers().contains(player.getName())) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: uSkyBlock");
+            return true;
+        }
+        return false;
+    }
+}

src/main/java/de/epiceric/shopchest/external/listeners/WorldGuardListener.java

@@ -0,0 +1,92 @@
+package de.epiceric.shopchest.external.listeners;
+
+import java.util.Optional;
+import java.util.Set;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.codemc.worldguardwrapper.WorldGuardWrapper;
+import org.codemc.worldguardwrapper.flag.IWrappedFlag;
+import org.codemc.worldguardwrapper.flag.WrappedState;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.event.ShopCreateEvent;
+import de.epiceric.shopchest.event.ShopExtendEvent;
+import de.epiceric.shopchest.utils.Utils;
+
+public class WorldGuardListener implements Listener {
+
+    private final ShopChest plugin;
+    private final WorldGuardWrapper wgWrapper;
+
+    public WorldGuardListener(ShopChest plugin) {
+        this.plugin = plugin;
+        this.wgWrapper = WorldGuardWrapper.getInstance();
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onCreateShop(ShopCreateEvent e) {
+        if (!Config.enableWorldGuardIntegration)
+            return;
+
+        Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+        IWrappedFlag<WrappedState> flag = getStateFlag("create-shop");
+        for (Location loc : chestLocations) {
+            if (handleForLocation(e.getPlayer(), loc, e, flag))
+                return;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void onExtendShop(ShopExtendEvent e) {
+        if (!Config.enableWorldGuardIntegration)
+            return;
+
+        handleForLocation(e.getPlayer(), e.getNewChestLocation(), e, getStateFlag("create-shop"));
+    }
+
+    // TODO: Outsource shop use external permission
+
+    // @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    // public void onBuySell(ShopBuySellEvent e) {
+    //     if (!Config.enableWorldGuardIntegration)
+    //         return;
+
+    //     Set<Location> chestLocations = Utils.getChestLocations(e.getShop());
+    //     String flagName = e.getShop().getShopType() == ShopType.ADMIN ? "use-admin-shop" : "use-shop";
+    //     IWrappedFlag<WrappedState> flag = getStateFlag(flagName);
+    //     for (Location loc : chestLocations) {
+    //         WrappedState state = wgWrapper.queryFlag(e.getPlayer(), loc, flag).orElse(WrappedState.DENY);
+    //         if (state == WrappedState.DENY) {
+    //             e.setCancelled(true);
+    //             return;
+    //         }
+    //     }
+    // }
+
+    private boolean handleForLocation(Player player, Location loc, Cancellable e, IWrappedFlag<WrappedState> flag) {
+        WrappedState state = wgWrapper.queryFlag(player, loc, flag).orElse(WrappedState.DENY);
+        if (state == WrappedState.DENY) {
+            e.setCancelled(true);
+            plugin.debug("Cancel Reason: WorldGuard");
+            return true;
+        }
+        return false;
+    }
+
+    private IWrappedFlag<WrappedState> getStateFlag(String flagName) {
+        Optional<IWrappedFlag<WrappedState>> flagOptional = wgWrapper.getFlag(flagName, WrappedState.class);
+        if (!flagOptional.isPresent()) {
+            plugin.getLogger().severe("Failed to get WorldGuard flag '" + flagName + "'.");
+            plugin.debug("WorldGuard flag '" + flagName + "' is not present!");
+            return null;
+        }
+        return flagOptional.get();
+    }
+    
+}

src/main/java/de/epiceric/shopchest/language/Replacement.java

@@ -7,9 +7,9 @@ public class Replacement {
     private Placeholder placeholder;
     private String replacement;
 
-    public Replacement(Placeholder placeholder, String replacement) {
+    public Replacement(Placeholder placeholder, Object replacement) {
         this.placeholder = placeholder;
-        this.replacement = replacement;
+        this.replacement = String.valueOf(replacement);
     }
 
     /**

src/main/java/de/epiceric/shopchest/listeners/ChestProtectListener.java

@@ -1,19 +1,12 @@
 package de.epiceric.shopchest.listeners;
 
-import com.palmergames.bukkit.towny.object.Resident;
-import com.palmergames.bukkit.towny.object.Town;
-import com.palmergames.bukkit.towny.object.TownBlock;
-import com.palmergames.bukkit.towny.object.TownyUniverse;
-import com.wasteofplastic.askyblock.ASkyBlockAPI;
-import com.wasteofplastic.askyblock.Island;
 import de.epiceric.shopchest.ShopChest;
 import de.epiceric.shopchest.config.Config;
 import de.epiceric.shopchest.config.Placeholder;
-import de.epiceric.shopchest.external.PlotSquaredShopFlag;
+import de.epiceric.shopchest.event.ShopExtendEvent;
 import de.epiceric.shopchest.language.LanguageUtils;
 import de.epiceric.shopchest.language.Message;
 import de.epiceric.shopchest.language.Replacement;
-import de.epiceric.shopchest.nms.Hologram;
 import de.epiceric.shopchest.shop.Shop;
 import de.epiceric.shopchest.shop.Shop.ShopType;
 import de.epiceric.shopchest.utils.Callback;
@@ -21,9 +14,9 @@ import de.epiceric.shopchest.utils.ItemUtils;
 import de.epiceric.shopchest.utils.Permissions;
 import de.epiceric.shopchest.utils.ShopUtils;
 import de.epiceric.shopchest.utils.Utils;
-import me.ryanhamshire.GriefPrevention.Claim;
 import net.milkbowl.vault.economy.EconomyResponse;
 
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
@@ -31,27 +24,18 @@ import org.bukkit.block.BlockFace;
 import org.bukkit.block.Chest;
 import org.bukkit.block.DoubleChest;
 import org.bukkit.block.data.type.Chest.Type;
-import org.bukkit.entity.ArmorStand;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
 import org.bukkit.event.block.BlockBreakEvent;
 import org.bukkit.event.block.BlockPlaceEvent;
-import org.bukkit.event.entity.EntityDamageEvent;
 import org.bukkit.event.entity.EntityExplodeEvent;
 import org.bukkit.event.inventory.InventoryMoveItemEvent;
 import org.bukkit.event.inventory.InventoryType;
 import org.bukkit.inventory.InventoryHolder;
-import org.codemc.worldguardwrapper.WorldGuardWrapper;
-import org.codemc.worldguardwrapper.flag.IWrappedFlag;
-import org.codemc.worldguardwrapper.flag.WrappedState;
-
-import pl.islandworld.api.IslandWorldApi;
-import us.talabrek.ultimateskyblock.api.IslandInfo;
 
 import java.util.ArrayList;
-import java.util.Optional;
 
 public class ChestProtectListener implements Listener {
 
@@ -153,6 +137,9 @@ public class ChestProtectListener implements Listener {
         Chest c = (Chest) b.getState();
         Block b2;
 
+        // Can't use Utils::getChestLocations since inventory holder
+        // has not been updated yet in this event (for 1.13+)
+
         if (Utils.getMajorVersion() < 13) {
             InventoryHolder ih = c.getInventory().getHolder();
             if (!(ih instanceof DoubleChest)) {
@@ -197,117 +184,42 @@ public class ChestProtectListener implements Listener {
             b2 = b.getRelative(neighborFacing);
         }
 
-        if (shopUtils.isShop(b.getLocation()) || shopUtils.isShop(b2.getLocation())) {
-            final Shop shop = shopUtils.getShop(b2.getLocation());
+        final Shop shop = shopUtils.getShop(b2.getLocation());
+        if (shop == null)
+            return;
 
-            plugin.debug(String.format("%s tries to extend %s's shop (#%d)", p.getName(), shop.getVendor().getName(), shop.getID()));
+        plugin.debug(String.format("%s tries to extend %s's shop (#%d)", p.getName(), shop.getVendor().getName(), shop.getID()));
 
-            boolean externalPluginsAllowed = true;
-
-            if (plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
-                WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
-                Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag("create-shop", WrappedState.class);
-                if (!flag.isPresent()) plugin.debug("WorldGuard flag 'create-shop' is not present!");
-                WrappedState state = flag.map(f -> wgWrapper.queryFlag(p, b.getLocation(), f).orElse(WrappedState.DENY)).orElse(WrappedState.DENY);
-                externalPluginsAllowed = state == WrappedState.ALLOW;
-            }
-
-            if (externalPluginsAllowed && plugin.hasTowny() && Config.enableTownyIntegration) {
-                TownBlock townBlock = TownyUniverse.getTownBlock(b.getLocation());
-                if (townBlock != null) {
-                    try {
-                        Town town = townBlock.getTown();
-                        for (Resident resident : town.getResidents()) {
-                            if (resident.getName().equals(p.getName())) {
-                                if (resident.isMayor()) {
-                                    externalPluginsAllowed = (Config.townyShopPlotsMayor.contains(townBlock.getType().name()));
-                                } else if (resident.isKing()) {
-                                    externalPluginsAllowed = (Config.townyShopPlotsKing.contains(townBlock.getType().name()));
-                                } else {
-                                    externalPluginsAllowed = (Config.townyShopPlotsResidents.contains(townBlock.getType().name()));
-                                }
-                                break;
-                            }
-                        }
-                    } catch (Exception ex) {
-                        plugin.debug(ex);
-                    }
-                }
-            }
-
-            if (externalPluginsAllowed && plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
-                com.github.intellectualsites.plotsquared.plot.object.Location loc =
-                        new com.github.intellectualsites.plotsquared.plot.object.Location(b.getWorld().getName(), b.getX(), b.getY(), b.getZ());
-
-                externalPluginsAllowed = PlotSquaredShopFlag.isFlagAllowedOnPlot(loc.getOwnedPlot(), PlotSquaredShopFlag.CREATE_SHOP, p);
-            }
-
-            if (externalPluginsAllowed && plugin.hasUSkyBlock() && Config.enableUSkyblockIntegration) {
-                IslandInfo islandInfo = plugin.getUSkyBlock().getIslandInfo(b.getLocation());
-                if (islandInfo != null) {
-                    externalPluginsAllowed = islandInfo.getMembers().contains(p.getName()) || islandInfo.getLeader().equals(p.getName());
-                }
-            }
-
-            if (externalPluginsAllowed && plugin.hasASkyBlock() && Config.enableASkyblockIntegration) {
-                Island island = ASkyBlockAPI.getInstance().getIslandAt(b.getLocation());
-                if (island != null) {
-                    if (island.getOwner() == null) {
-                        externalPluginsAllowed = island.getMembers().contains(p.getUniqueId());
-                    } else {
-                        externalPluginsAllowed = island.getMembers().contains(p.getUniqueId()) || island.getOwner().equals(p.getUniqueId());
-                    }
-                }
-            }
-
-            if (externalPluginsAllowed && plugin.hasIslandWorld() && Config.enableIslandWorldIntegration && IslandWorldApi.isInitialized()) {
-                if (b.getWorld().getName().equals(IslandWorldApi.getIslandWorld().getName())) {
-                    externalPluginsAllowed = IslandWorldApi.canBuildOnLocation(p, b.getLocation(), true);
-                }
-            }
-
-            if (externalPluginsAllowed && plugin.hasGriefPrevention() && Config.enableGriefPreventionIntegration) {
-                Claim claim = plugin.getGriefPrevention().dataStore.getClaimAt(b.getLocation(), false, null);
-                if (claim != null) {
-                    externalPluginsAllowed = claim.allowContainers(p) == null;
-                }
-            }
-
-            if (externalPluginsAllowed || p.hasPermission(Permissions.EXTEND_PROTECTED)) {
-                if (shop.getVendor().getUniqueId().equals(p.getUniqueId()) || p.hasPermission(Permissions.EXTEND_OTHER)) {
-                    if (ItemUtils.isAir(b.getRelative(BlockFace.UP).getType())) {
-                        final Shop newShop = new Shop(shop.getID(), plugin, shop.getVendor(), shop.getProduct(), shop.getLocation(), shop.getBuyPrice(), shop.getSellPrice(), shop.getShopType());
-
-                        shopUtils.removeShop(shop, true, new Callback<Void>(plugin) {
-                            @Override
-                            public void onResult(Void result) {
-                                newShop.create(true);
-                                shopUtils.addShop(newShop, true);
-                                plugin.debug(String.format("%s extended %s's shop (#%d)", p.getName(), shop.getVendor().getName(), shop.getID()));
-                            }
-                        });
-                    } else {
-                        e.setCancelled(true);
-                        p.sendMessage(LanguageUtils.getMessage(Message.CHEST_BLOCKED));
-                    }
-                } else {
-                    e.setCancelled(true);
-                    p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_EXTEND_OTHERS));
-                }
-            } else {
-                e.setCancelled(true);
-                p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_EXTEND_PROTECTED));
-            }
+        ShopExtendEvent event = new ShopExtendEvent(p, shop, b.getLocation());
+        Bukkit.getPluginManager().callEvent(event);
+        if (event.isCancelled() && !p.hasPermission(Permissions.EXTEND_PROTECTED)) {
+            e.setCancelled(true);
+            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_EXTEND_PROTECTED));
+            return;
         }
-    }
 
-    @EventHandler(ignoreCancelled = true)
-    public void onHologramDamage(EntityDamageEvent e) {
-        if (e.getEntity() instanceof ArmorStand) {
-            if (Hologram.isPartOfHologram((ArmorStand) e.getEntity())) {
-                e.setCancelled(true);
-            }
+        if (!p.getUniqueId().equals(shop.getVendor().getUniqueId()) && !p.hasPermission(Permissions.EXTEND_OTHER)) {
+            e.setCancelled(true);
+            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_EXTEND_OTHERS));
+            return;
         }
+
+        if (!ItemUtils.isAir(b.getRelative(BlockFace.UP).getType())) {
+            e.setCancelled(true);
+            p.sendMessage(LanguageUtils.getMessage(Message.CHEST_BLOCKED));
+            return;
+        }
+
+        final Shop newShop = new Shop(shop.getID(), plugin, shop.getVendor(), shop.getProduct(), shop.getLocation(), shop.getBuyPrice(), shop.getSellPrice(), shop.getShopType());
+
+        shopUtils.removeShop(shop, true, new Callback<Void>(plugin) {
+            @Override
+            public void onResult(Void result) {
+                newShop.create(true);
+                shopUtils.addShop(newShop, true);
+                plugin.debug(String.format("%s extended %s's shop (#%d)", p.getName(), shop.getVendor().getName(), shop.getID()));
+            }
+        });
     }
 
     @EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)

src/main/java/de/epiceric/shopchest/listeners/ShopInteractListener.java

@@ -1,13 +1,7 @@
 package de.epiceric.shopchest.listeners;
 
-import com.google.gson.JsonPrimitive;
 import com.github.intellectualsites.plotsquared.plot.object.Plot;
-import com.palmergames.bukkit.towny.object.Resident;
-import com.palmergames.bukkit.towny.object.Town;
-import com.palmergames.bukkit.towny.object.TownBlock;
-import com.palmergames.bukkit.towny.object.TownyUniverse;
-import com.wasteofplastic.askyblock.ASkyBlockAPI;
-import com.wasteofplastic.askyblock.Island;
+import com.google.gson.JsonPrimitive;
 import de.epiceric.shopchest.ShopChest;
 import de.epiceric.shopchest.config.Config;
 import de.epiceric.shopchest.config.Placeholder;
@@ -33,7 +27,6 @@ import de.epiceric.shopchest.utils.Permissions;
 import de.epiceric.shopchest.utils.ShopUtils;
 import de.epiceric.shopchest.utils.Utils;
 import fr.xephi.authme.api.v3.AuthMeApi;
-import me.ryanhamshire.GriefPrevention.Claim;
 import net.milkbowl.vault.economy.Economy;
 import net.milkbowl.vault.economy.EconomyResponse;
 
@@ -54,12 +47,10 @@ import org.bukkit.event.Listener;
 import org.bukkit.event.block.Action;
 import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.event.inventory.InventoryClickEvent;
-import org.bukkit.event.player.PlayerArmorStandManipulateEvent;
 import org.bukkit.event.player.PlayerInteractAtEntityEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
 import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.inventory.Inventory;
-import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.PlayerInventory;
 import org.bukkit.scheduler.BukkitRunnable;
@@ -67,9 +58,6 @@ import org.codemc.worldguardwrapper.WorldGuardWrapper;
 import org.codemc.worldguardwrapper.flag.IWrappedFlag;
 import org.codemc.worldguardwrapper.flag.WrappedState;
 
-import pl.islandworld.api.IslandWorldApi;
-import us.talabrek.ultimateskyblock.api.IslandInfo;
-
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -124,216 +112,47 @@ public class ShopInteractListener implements Listener {
         }.runTaskLater(plugin, 1L);
     }
 
-    @EventHandler(ignoreCancelled = true)
-    public void onPlayerManipulateArmorStand(PlayerArmorStandManipulateEvent e) {
-        // When clicking an armor stand with an armor item, the armor stand will take it.
-        // As a hologram consists of armor stands, they would also take the item.
-        ArmorStand armorStand = e.getRightClicked();
-        if (Hologram.isPartOfHologram(armorStand)) {
-            e.setCancelled(true);
-        }
-    }
-
     @EventHandler(priority = EventPriority.HIGH)
     public void onPlayerInteractCreate(PlayerInteractEvent e) {
         Player p = e.getPlayer();
         Block b = e.getClickedBlock();
 
-        if (Config.enableAuthMeIntegration && plugin.hasAuthMe() && !AuthMeApi.getInstance().isAuthenticated(p)) return;
+        if (e.getAction() != Action.RIGHT_CLICK_BLOCK)
+            return;
 
-        if (e.getAction() == Action.RIGHT_CLICK_BLOCK) {
-            if (b.getType().equals(Material.CHEST) || b.getType().equals(Material.TRAPPED_CHEST)) {
-                if (e.getAction() == Action.RIGHT_CLICK_BLOCK) {
-                    if (ClickType.getPlayerClickType(p) != null) {
-                        if (ClickType.getPlayerClickType(p).getClickType() == ClickType.EnumClickType.CREATE) {
-                            if (!shopUtils.isShop(b.getLocation())) {
+        if (ClickType.getPlayerClickType(p) == null)
+            return;
 
-                                boolean externalPluginsAllowed = true;
+        if (b.getType() != Material.CHEST && b.getType() != Material.TRAPPED_CHEST)
+            return;
 
-                                Location[] chestLocations = {b.getLocation(), null};
+        if (ClickType.getPlayerClickType(p).getClickType() != ClickType.EnumClickType.CREATE)
+            return;
 
-                                InventoryHolder ih = ((Chest) b.getState()).getInventory().getHolder();
-                                if (ih instanceof DoubleChest) {
-                                    DoubleChest dc = (DoubleChest) ih;
-                                    chestLocations[0] = ((Chest) dc.getLeftSide()).getLocation();
-                                    chestLocations[1] = ((Chest) dc.getRightSide()).getLocation();
-                                }
+        if (Config.enableAuthMeIntegration && plugin.hasAuthMe() && !AuthMeApi.getInstance().isAuthenticated(p))
+            return;
 
-                                String denyReason = "Event Cancelled";
+        if (shopUtils.isShop(b.getLocation())) {
+            p.sendMessage(LanguageUtils.getMessage(Message.CHEST_ALREADY_SHOP));
+            plugin.debug("Chest is already a shop");
+        } else if (e.isCancelled() && !p.hasPermission(Permissions.CREATE_PROTECTED)) {
+            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_CREATE_PROTECTED));
+            plugin.debug(p.getName() + " is not allowed to create a shop on the selected chest");
+        } else if (!ItemUtils.isAir(b.getRelative(BlockFace.UP).getType())) {
+            p.sendMessage(LanguageUtils.getMessage(Message.CHEST_BLOCKED));
+            plugin.debug("Chest is blocked");
+        } else {
+            ClickType clickType = ClickType.getPlayerClickType(p);
+            ShopProduct product = clickType.getProduct();
+            double buyPrice = clickType.getBuyPrice();
+            double sellPrice = clickType.getSellPrice();
+            ShopType shopType = clickType.getShopType();
     
-                                if (plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
-                                    plugin.debug("Checking if WorldGuard allows shop creation...");
-                                    WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
-                                    Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag("create-shop", WrappedState.class);
-                                    if (flag.isPresent()) {
-                                      for (Location loc : chestLocations) {
-                                            if (loc != null) {
-                                                WrappedState state = wgWrapper.queryFlag(p, loc, flag.get()).orElse(WrappedState.DENY);
-                                                externalPluginsAllowed = state == WrappedState.ALLOW;
-                                            }
-                                        }
-                                    } else {
-                                        plugin.debug("WorldGuard flag 'create-shop' is not present!");
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "WorldGuard";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasTowny() && Config.enableTownyIntegration) {
-                                    plugin.debug("Checking if Towny allows shop creation...");
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            TownBlock townBlock = TownyUniverse.getTownBlock(loc);
-                                            if (townBlock != null) {
-                                                plugin.debug("Plot Type is " + townBlock.getType().name());
-                                                try {
-                                                    Town town = townBlock.getTown();
-                                                    boolean residentFound = false;
-                                                    for (Resident resident : town.getResidents()) {
-                                                        if (resident.getName().equals(p.getName())) {
-                                                            residentFound = true;
-                                                            if (resident.isMayor()) {
-                                                                plugin.debug(p.getName() + " is mayor of town");
-                                                                externalPluginsAllowed &= (Config.townyShopPlotsMayor.contains(townBlock.getType().name()));
-                                                            } else if (resident.isKing()) {
-                                                                plugin.debug(p.getName() + " is king of town");
-                                                                externalPluginsAllowed &= (Config.townyShopPlotsKing.contains(townBlock.getType().name()));
-                                                            } else {
-                                                                plugin.debug(p.getName() + " is resident in town");
-                                                                externalPluginsAllowed &= (Config.townyShopPlotsResidents.contains(townBlock.getType().name()));
-                                                            }
-                                                            break;
-                                                        }
-                                                    }
-                                                    if (!residentFound) {
-                                                        plugin.debug(p.getName() + " is not resident in town");
-                                                        externalPluginsAllowed = false;
-                                                    }
-                                                } catch (Exception ex) {
-                                                    plugin.debug(ex);
-                                                }
-                                            }
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "Towny";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
-                                    plugin.debug("Checking if PlotSquared allows shop creation...");
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            com.github.intellectualsites.plotsquared.plot.object.Location plotLocation = new com.github.intellectualsites.plotsquared.plot.object.Location(
-                                                    loc.getWorld().getName(), loc.getBlockX(), loc.getBlockY(), loc.getBlockZ());
-
-                                            Plot plot = plotLocation.getOwnedPlot();
-                                            externalPluginsAllowed &= PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, PlotSquaredShopFlag.CREATE_SHOP, p);
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "PlotSquared";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasUSkyBlock() && Config.enableUSkyblockIntegration) {
-                                    plugin.debug("Checking if uSkyBlock allows shop creation...");
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            IslandInfo islandInfo = plugin.getUSkyBlock().getIslandInfo(loc);
-                                            if (islandInfo != null) {
-                                                plugin.debug("Chest is on island of " + islandInfo.getLeader());
-                                                externalPluginsAllowed &= islandInfo.getMembers().contains(p.getName()) || islandInfo.getLeader().equals(p.getName());
-                                            }
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "uSkyBlock";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasASkyBlock() && Config.enableASkyblockIntegration) {
-                                    plugin.debug("Checking if ASkyBlock allows shop creation...");
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            Island island = ASkyBlockAPI.getInstance().getIslandAt(loc);
-                                            if (island != null) {
-                                                if (island.getOwner() == null) {
-                                                    plugin.debug("Chest is on an unowned island.");
-                                                    externalPluginsAllowed &= island.getMembers().contains(p.getUniqueId());
-                                                } else {
-                                                    plugin.debug("Chest is on island of " + Bukkit.getOfflinePlayer(island.getOwner()).getName());
-                                                    externalPluginsAllowed &= island.getMembers().contains(p.getUniqueId()) || island.getOwner().equals(p.getUniqueId());
-                                                }
-                                            }
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "ASkyBlock";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasIslandWorld() && Config.enableIslandWorldIntegration && IslandWorldApi.isInitialized()) {
-                                    plugin.debug("Checking if IslandWorld allows shop creation...");
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            if (loc.getWorld().getName().equals(IslandWorldApi.getIslandWorld().getName())) {
-                                                plugin.debug("Chest is in island world");
-                                                externalPluginsAllowed &= IslandWorldApi.canBuildOnLocation(p, loc, true);
-                                            }
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "IslandWorld";
-                                }
-
-                                if (externalPluginsAllowed && plugin.hasGriefPrevention() && Config.enableGriefPreventionIntegration) {
-                                    plugin.debug("Checking if GriefPrevention allows shop creation...");
-                                    String gpDenyReason = null;
-                                    for (Location loc : chestLocations) {
-                                        if (loc != null) {
-                                            Claim claim = plugin.getGriefPrevention().dataStore.getClaimAt(loc, false, null);
-                                            if (claim != null) {
-                                                plugin.debug("Checking if claim allows container access");
-                                                gpDenyReason = claim.allowContainers(p);
-                                                externalPluginsAllowed &= gpDenyReason == null;
-                                            }
-                                        }
-                                    }
-
-                                    if (!externalPluginsAllowed) denyReason = "GriefPrevention (" + gpDenyReason + ")";
-                                }
-
-                                if ((e.isCancelled() || !externalPluginsAllowed) && !p.hasPermission(Permissions.CREATE_PROTECTED)) {
-                                    p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_CREATE_PROTECTED));
-                                    ClickType.removePlayerClickType(p);
-                                    plugin.debug(p.getName() + " is not allowed to create a shop on the selected chest because " + denyReason);
-                                    e.setCancelled(true);
-                                    return;
-                                }
-
-                                e.setCancelled(true);
-
-                                if (ItemUtils.isAir(b.getRelative(BlockFace.UP).getType())) {
-                                    ClickType clickType = ClickType.getPlayerClickType(p);
-                                    ShopProduct product = clickType.getProduct();
-                                    double buyPrice = clickType.getBuyPrice();
-                                    double sellPrice = clickType.getSellPrice();
-                                    ShopType shopType = clickType.getShopType();
-
-                                    create(p, b.getLocation(), product, buyPrice, sellPrice, shopType);
-                                } else {
-                                    p.sendMessage(LanguageUtils.getMessage(Message.CHEST_BLOCKED));
-                                    plugin.debug("Chest is blocked");
-                                }
-                            } else {
-                                e.setCancelled(true);
-                                p.sendMessage(LanguageUtils.getMessage(Message.CHEST_ALREADY_SHOP));
-                                plugin.debug("Chest is already a shop");
-                            }
-
-                            ClickType.removePlayerClickType(p);
-                        }
-                    }
-                }
-            }
+            create(p, b.getLocation(), product, buyPrice, sellPrice, shopType);
         }
+
+        e.setCancelled(true);
+        ClickType.removePlayerClickType(p);
     }
 
     private Map<UUID, Set<Integer>> needsConfirmation = new HashMap<>();
@@ -343,314 +162,292 @@ public class ShopInteractListener implements Listener {
         Player p = e.getPlayer();
         boolean inverted = Config.invertMouseButtons;
 
-        if (Utils.getMajorVersion() >= 9) {
-            if (e.getHand() == EquipmentSlot.OFF_HAND) return;
-        }
+        if (Utils.getMajorVersion() >= 9 && e.getHand() == EquipmentSlot.OFF_HAND)
+            return;
 
-        if (e.getAction() == Action.RIGHT_CLICK_BLOCK || e.getAction() == Action.LEFT_CLICK_BLOCK) {
-            if (b.getType().equals(Material.CHEST) || b.getType().equals(Material.TRAPPED_CHEST)) {
-                if (ClickType.getPlayerClickType(p) != null) {
-                    if (e.getAction() == Action.RIGHT_CLICK_BLOCK) {
-                        Shop shop = shopUtils.getShop(b.getLocation());
-                        if (shop != null || ClickType.getPlayerClickType(p).getClickType() == ClickType.EnumClickType.CREATE) {
-                            switch (ClickType.getPlayerClickType(p).getClickType()) {
-                                case CREATE:
-                                    break;
+        if (e.getAction() != Action.RIGHT_CLICK_BLOCK && e.getAction() != Action.LEFT_CLICK_BLOCK)
+            return;
         
-                                case INFO:
-                                    e.setCancelled(true);
+        if (b.getType() != Material.CHEST && b.getType() != Material.TRAPPED_CHEST)
+            return;
         
-                                    info(p, shop);
+        if (ClickType.getPlayerClickType(p) != null) {
+            if (e.getAction() != Action.RIGHT_CLICK_BLOCK)
+                return;
 
-                                    ClickType.removePlayerClickType(p);
-                                    break;
+            Shop shop = shopUtils.getShop(b.getLocation());
+            if (shop == null && ClickType.getPlayerClickType(p).getClickType() != ClickType.EnumClickType.CREATE) {
+                p.sendMessage(LanguageUtils.getMessage(Message.CHEST_NO_SHOP));
+                plugin.debug("Chest is not a shop");
+                return;
+            }
 
-                                case REMOVE:
-                                    e.setCancelled(true);
+            switch (ClickType.getPlayerClickType(p).getClickType()) {
+                case CREATE:
+                    return;
                     
-                                    if (shop.getShopType() == ShopType.ADMIN) {
-                                        if (p.hasPermission(Permissions.REMOVE_ADMIN)) {
-                                            remove(p, shop);
-                                        } else {
-                                            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_REMOVE_ADMIN));
-                                            plugin.debug(p.getName() + " is not permitted to remove an admin shop");
-                                        }
-                                    } else {
-                                        if (shop.getVendor().getUniqueId().equals(p.getUniqueId()) || p.hasPermission(Permissions.REMOVE_OTHER)) {
-                                            remove(p, shop);
-                                        } else {
-                                            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_REMOVE_OTHERS));
-                                            plugin.debug(p.getName() + " is not permitted to remove another player's shop");
-                                        }
-                                    }
+                case INFO:
+                    info(p, shop);
+                    break;
 
-                                    ClickType.removePlayerClickType(p);
-                                    break;
+                case REMOVE:
+                    remove(p, shop);
+                    break;
 
-                                case OPEN:
-                                    e.setCancelled(true);
+                case OPEN:
+                    open(p, shop, true);
+                    break;
+            }
 
-                                    if (p.getUniqueId().equals(shop.getVendor().getUniqueId()) || p.hasPermission(Permissions.OPEN_OTHER)) {
-                                        open(p, shop, true);
-                                    } else {
-                                        p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_OPEN_OTHERS));
-                                        plugin.debug(p.getName() + " is not permitted to open another player's shop");
-                                    }
+            e.setCancelled(true);
+            ClickType.removePlayerClickType(p);
+        } else {
+            Shop shop = shopUtils.getShop(b.getLocation());
 
-                                    ClickType.removePlayerClickType(p);
-                                    break;
-                            }
-                        } else {
-                            p.sendMessage(LanguageUtils.getMessage(Message.CHEST_NO_SHOP));
-                            plugin.debug("Chest is not a shop");
+            if (shop == null)
+                return;
+
+            boolean confirmed = needsConfirmation.containsKey(p.getUniqueId()) && needsConfirmation.get(p.getUniqueId()).contains(shop.getID());
+            
+            if (e.getAction() == Action.LEFT_CLICK_BLOCK && p.isSneaking() && Utils.hasAxeInHand(p)) {
+                return;
+            }
+
+            ItemStack infoItem = Config.shopInfoItem;
+            if (infoItem != null) {
+                if (e.getAction() == Action.RIGHT_CLICK_BLOCK || e.getAction() == Action.LEFT_CLICK_BLOCK) {
+                    ItemStack item = Utils.getItemInMainHand(p);
+
+                    if (item == null || !(infoItem.getType() == item.getType() && infoItem.getDurability() == item.getDurability())) {
+                        item = Utils.getItemInOffHand(p);
+
+                        if (item != null && infoItem.getType() == item.getType() && infoItem.getDurability() == item.getDurability()) {
+                            e.setCancelled(true);
+                            info(p, shop);
+                            return;
                         }
+                    } else {
+                        e.setCancelled(true);
+                        info(p, shop);
+                        return;
                     }
-                } else {
-                    Shop shop = shopUtils.getShop(b.getLocation());
+                }
+            }
 
-                    if (shop != null) {
-                        boolean confirmed = needsConfirmation.containsKey(p.getUniqueId()) && needsConfirmation.get(p.getUniqueId()).contains(shop.getID());
+            if (e.getAction() == Action.RIGHT_CLICK_BLOCK && p.getUniqueId().equals(shop.getVendor().getUniqueId()) && shop.getShopType() != ShopType.ADMIN) {
+                return;
+            }
 
-                        if (e.getAction() == Action.LEFT_CLICK_BLOCK && p.isSneaking() && Utils.hasAxeInHand(p)) {
-                            return;
-                        }
+            if (p.getGameMode() == GameMode.CREATIVE) {
+                e.setCancelled(true);
+                p.sendMessage(LanguageUtils.getMessage(Message.USE_IN_CREATIVE));
+                return;
+            }
 
-                        ItemStack infoItem = Config.shopInfoItem;
-                        if (infoItem != null) {
-                            if (e.getAction() == Action.RIGHT_CLICK_BLOCK || e.getAction() == Action.LEFT_CLICK_BLOCK) {
-                                ItemStack item = Utils.getItemInMainHand(p);
+            if ((e.getAction() == Action.RIGHT_CLICK_BLOCK && !inverted) || (e.getAction() == Action.LEFT_CLICK_BLOCK && inverted)) {
+                e.setCancelled(true);
 
-                                if (item == null || !(infoItem.getType() == item.getType() && infoItem.getDurability() == item.getDurability())) {
-                                    item = Utils.getItemInOffHand(p);
+                if (shop.getShopType() == ShopType.ADMIN || !shop.getVendor().getUniqueId().equals(p.getUniqueId())) {
+                    plugin.debug(p.getName() + " wants to buy");
 
-                                    if (item != null && infoItem.getType() == item.getType() && infoItem.getDurability() == item.getDurability()) {
-                                        e.setCancelled(true);
-                                        info(p, shop);
-                                        return;
-                                    }
-                                } else {
-                                    e.setCancelled(true);
-                                    info(p, shop);
-                                    return;
-                                }
-                            }
-                        }
+                    if (shop.getBuyPrice() > 0) {
+                        if (p.hasPermission(Permissions.BUY)) {
+                            // TODO: Outsource shop use external permission
+                            boolean externalPluginsAllowed = true;
 
-                        if (e.getAction() == Action.RIGHT_CLICK_BLOCK && p.getUniqueId().equals(shop.getVendor().getUniqueId()) && shop.getShopType() != ShopType.ADMIN) {
-                            return;
-                        }
+                            if (plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
+                                com.github.intellectualsites.plotsquared.plot.object.Location plotLocation =
+                                        new com.github.intellectualsites.plotsquared.plot.object.Location(b.getWorld().getName(), b.getX(), b.getY(), b.getZ());
 
-                        if (p.getGameMode() == GameMode.CREATIVE) {
-                            e.setCancelled(true);
-                            p.sendMessage(LanguageUtils.getMessage(Message.USE_IN_CREATIVE));
-                            return;
-                        }
+                                Plot plot = plotLocation.getOwnedPlot();
+                                GroupFlag flag = shop.getShopType() == Shop.ShopType.ADMIN ? PlotSquaredShopFlag.USE_ADMIN_SHOP : PlotSquaredShopFlag.USE_SHOP;
 
-                        if ((e.getAction() == Action.RIGHT_CLICK_BLOCK && !inverted) || (e.getAction() == Action.LEFT_CLICK_BLOCK && inverted)) {
-                            e.setCancelled(true);
-
-                            if (shop.getShopType() == ShopType.ADMIN || !shop.getVendor().getUniqueId().equals(p.getUniqueId())) {
-                                plugin.debug(p.getName() + " wants to buy");
-
-                                if (shop.getBuyPrice() > 0) {
-                                    if (p.hasPermission(Permissions.BUY)) {
-                                        boolean externalPluginsAllowed = true;
-
-                                        if (plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
-                                            com.github.intellectualsites.plotsquared.plot.object.Location plotLocation =
-                                                    new com.github.intellectualsites.plotsquared.plot.object.Location(b.getWorld().getName(), b.getX(), b.getY(), b.getZ());
-
-                                            Plot plot = plotLocation.getOwnedPlot();
-                                            GroupFlag flag = shop.getShopType() == Shop.ShopType.ADMIN ? PlotSquaredShopFlag.USE_ADMIN_SHOP : PlotSquaredShopFlag.USE_SHOP;
-
-                                            externalPluginsAllowed = PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, flag, p);
-                                        }
-
-                                        if (externalPluginsAllowed && plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
-                                            String flagName = (shop.getShopType() == ShopType.ADMIN ? "use-admin-shop" : "use-shop");
-                                            WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
-                                            Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag(flagName, WrappedState.class);
-                                            if (!flag.isPresent()) plugin.debug("WorldGuard flag '" + flagName + "' is not present!");
-                                            WrappedState state = flag.map(f -> wgWrapper.queryFlag(p, b.getLocation(), f).orElse(WrappedState.DENY)).orElse(WrappedState.DENY);
-                                            externalPluginsAllowed = state == WrappedState.ALLOW;
-                                        }
-
-                                        if (shop.getShopType() == ShopType.ADMIN) {
-                                            if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
-                                                if (confirmed || !Config.confirmShopping) {
-                                                    buy(p, shop, p.isSneaking());
-                                                    if (Config.confirmShopping) {
-                                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                        ids.remove(shop.getID());
-                                                        if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
-                                                        else needsConfirmation.put(p.getUniqueId(), ids);
-                                                    }
-                                                } else {
-                                                    plugin.debug("Needs confirmation");
-                                                    p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
-                                                    Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                    ids.add(shop.getID());
-                                                    needsConfirmation.put(p.getUniqueId(), ids);
-                                                }
-                                            } else {
-                                                plugin.debug(p.getName() + " doesn't have external plugin's permission");
-                                                p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY_HERE));
-                                            }
-                                        } else {
-                                            if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
-                                                Chest c = (Chest) b.getState();
-                                                ItemStack itemStack = shop.getProduct().getItemStack();
-                                                int amount = (p.isSneaking() ? itemStack.getMaxStackSize() : shop.getProduct().getAmount());
-
-                                                if (Utils.getAmount(c.getInventory(), itemStack) >= amount) {
-                                                    if (confirmed || !Config.confirmShopping) {
-                                                        buy(p, shop, p.isSneaking());
-                                                        if (Config.confirmShopping) {
-                                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                            ids.remove(shop.getID());
-                                                            if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
-                                                            else needsConfirmation.put(p.getUniqueId(), ids);
-                                                        }
-                                                    } else {
-                                                        plugin.debug("Needs confirmation");
-                                                        p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
-                                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                        ids.add(shop.getID());
-                                                        needsConfirmation.put(p.getUniqueId(), ids);
-                                                    }
-                                                } else {
-                                                    if (Config.autoCalculateItemAmount && Utils.getAmount(c.getInventory(), itemStack) > 0) {
-                                                        if (confirmed || !Config.confirmShopping) {
-                                                            buy(p, shop, p.isSneaking());
-                                                            if (Config.confirmShopping) {
-                                                                Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                                ids.remove(shop.getID());
-                                                                if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
-                                                                else needsConfirmation.put(p.getUniqueId(), ids);
-                                                            }
-                                                        } else {
-                                                            plugin.debug("Needs confirmation");
-                                                            p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
-                                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                            ids.add(shop.getID());
-                                                            needsConfirmation.put(p.getUniqueId(), ids);
-                                                        }
-                                                    } else {
-                                                        p.sendMessage(LanguageUtils.getMessage(Message.OUT_OF_STOCK));
-                                                        if (shop.getVendor().isOnline() && Config.enableVendorMessages) {
-                                                            shop.getVendor().getPlayer().sendMessage(LanguageUtils.getMessage(Message.VENDOR_OUT_OF_STOCK,
-                                                                    new Replacement(Placeholder.AMOUNT, String.valueOf(shop.getProduct().getAmount())),
-                                                                            new Replacement(Placeholder.ITEM_NAME, LanguageUtils.getItemName(itemStack))));
-                                                        }
-                                                        plugin.debug("Shop is out of stock");
-                                                    }
-                                                }
-                                            } else {
-                                                plugin.debug(p.getName() + " doesn't have external plugin's permission");
-                                                p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY_HERE));
-                                            }
-                                        }
-                                    } else {
-                                        p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY));
-                                        plugin.debug(p.getName() + " is not permitted to buy");
-                                    }
-                                } else {
-                                    p.sendMessage(LanguageUtils.getMessage(Message.BUYING_DISABLED));
-                                    plugin.debug("Buying is disabled");
-                                }
+                                externalPluginsAllowed = PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, flag, p);
                             }
 
-                        } else if ((e.getAction() == Action.LEFT_CLICK_BLOCK && !inverted) || (e.getAction() == Action.RIGHT_CLICK_BLOCK && inverted)) {
-                            e.setCancelled(true);
+                            if (externalPluginsAllowed && plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
+                                String flagName = (shop.getShopType() == ShopType.ADMIN ? "use-admin-shop" : "use-shop");
+                                WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
+                                Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag(flagName, WrappedState.class);
+                                if (!flag.isPresent()) plugin.debug("WorldGuard flag '" + flagName + "' is not present!");
+                                WrappedState state = flag.map(f -> wgWrapper.queryFlag(p, b.getLocation(), f).orElse(WrappedState.DENY)).orElse(WrappedState.DENY);
+                                externalPluginsAllowed = state == WrappedState.ALLOW;
+                            }
                             
-                            if ((shop.getShopType() == ShopType.ADMIN) || (!shop.getVendor().getUniqueId().equals(p.getUniqueId()))) {
-                                plugin.debug(p.getName() + " wants to sell");
-
-                                if (shop.getSellPrice() > 0) {
-                                    if (p.hasPermission(Permissions.SELL)) {
-                                        boolean externalPluginsAllowed = true;
-
-                                        if (plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
-                                            com.github.intellectualsites.plotsquared.plot.object.Location plotLocation =
-                                                    new com.github.intellectualsites.plotsquared.plot.object.Location(b.getWorld().getName(), b.getX(), b.getY(), b.getZ());
-
-                                            Plot plot = plotLocation.getOwnedPlot();
-                                            GroupFlag flag = shop.getShopType() == Shop.ShopType.ADMIN ? PlotSquaredShopFlag.USE_ADMIN_SHOP : PlotSquaredShopFlag.USE_SHOP;
-                                            
-                                            externalPluginsAllowed = PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, flag, p);
-                                        }
-
-                                        if (externalPluginsAllowed && plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
-                                            String flagName = (shop.getShopType() == ShopType.ADMIN ? "use-admin-shop" : "use-shop");
-                                            WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
-                                            Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag(flagName, WrappedState.class);
-                                            if (!flag.isPresent()) plugin.debug("WorldGuard flag '" + flagName + "' is not present!");
-                                            WrappedState state = flag.map(f -> wgWrapper.queryFlag(p, b.getLocation(), f).orElse(WrappedState.DENY)).orElse(WrappedState.DENY);
-                                            externalPluginsAllowed = state == WrappedState.ALLOW;
-                                        }
-
-                                        ItemStack itemStack = shop.getProduct().getItemStack();
-
-                                        if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
-                                            boolean stack = p.isSneaking() && !Utils.hasAxeInHand(p);
-                                            int amount = stack ? itemStack.getMaxStackSize() : shop.getProduct().getAmount();
-
-                                            if (Utils.getAmount(p.getInventory(), itemStack) >= amount) {
-                                                if (confirmed || !Config.confirmShopping) {
-                                                    sell(p, shop, stack);
-                                                    if (Config.confirmShopping) {
-                                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                        ids.remove(shop.getID());
-                                                        if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
-                                                        else needsConfirmation.put(p.getUniqueId(), ids);
-                                                    }
-                                                } else {
-                                                    plugin.debug("Needs confirmation");
-                                                    p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
-                                                    Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                    ids.add(shop.getID());
-                                                    needsConfirmation.put(p.getUniqueId(), ids);
-                                                }
-                                            } else {
-                                                if (Config.autoCalculateItemAmount && Utils.getAmount(p.getInventory(), itemStack) > 0) {
-                                                    if (confirmed || !Config.confirmShopping) {
-                                                        sell(p, shop, stack);
-                                                        if (Config.confirmShopping) {
-                                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                            ids.remove(shop.getID());
-                                                            if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
-                                                            else needsConfirmation.put(p.getUniqueId(), ids);
-                                                        }
-                                                    } else {
-                                                        plugin.debug("Needs confirmation");
-                                                        p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
-                                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
-                                                        ids.add(shop.getID());
-                                                        needsConfirmation.put(p.getUniqueId(), ids);
-                                                    }
-                                                } else {
-                                                    p.sendMessage(LanguageUtils.getMessage(Message.NOT_ENOUGH_ITEMS));
-                                                    plugin.debug(p.getName() + " doesn't have enough items");
-                                                }
-                                            }
-                                        } else {
-                                            plugin.debug(p.getName() + " doesn't have external plugin's permission");
-                                            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_SELL_HERE));
+                            if (shop.getShopType() == ShopType.ADMIN) {
+                                if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
+                                    if (confirmed || !Config.confirmShopping) {
+                                        buy(p, shop, p.isSneaking());
+                                        if (Config.confirmShopping) {
+                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                            ids.remove(shop.getID());
+                                            if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
+                                            else needsConfirmation.put(p.getUniqueId(), ids);
                                         }
                                     } else {
-                                        p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_SELL));
-                                        plugin.debug(p.getName() + " is not permitted to sell");
+                                        plugin.debug("Needs confirmation");
+                                        p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
+                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                        ids.add(shop.getID());
+                                        needsConfirmation.put(p.getUniqueId(), ids);
                                     }
                                 } else {
-                                    p.sendMessage(LanguageUtils.getMessage(Message.SELLING_DISABLED));
-                                    plugin.debug("Selling is disabled");
+                                    plugin.debug(p.getName() + " doesn't have external plugin's permission");
+                                    p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY_HERE));
                                 }
                             } else {
-                                e.setCancelled(false);
+                                if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
+                                    Chest c = (Chest) b.getState();
+                                    ItemStack itemStack = shop.getProduct().getItemStack();
+                                    int amount = (p.isSneaking() ? itemStack.getMaxStackSize() : shop.getProduct().getAmount());
+
+                                    if (Utils.getAmount(c.getInventory(), itemStack) >= amount) {
+                                        if (confirmed || !Config.confirmShopping) {
+                                            buy(p, shop, p.isSneaking());
+                                            if (Config.confirmShopping) {
+                                                Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                                ids.remove(shop.getID());
+                                                if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
+                                                else needsConfirmation.put(p.getUniqueId(), ids);
+                                            }
+                                        } else {
+                                            plugin.debug("Needs confirmation");
+                                            p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
+                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                            ids.add(shop.getID());
+                                            needsConfirmation.put(p.getUniqueId(), ids);
+                                        }
+                                    } else {
+                                        if (Config.autoCalculateItemAmount && Utils.getAmount(c.getInventory(), itemStack) > 0) {
+                                            if (confirmed || !Config.confirmShopping) {
+                                                buy(p, shop, p.isSneaking());
+                                                if (Config.confirmShopping) {
+                                                    Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                                    ids.remove(shop.getID());
+                                                    if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
+                                                    else needsConfirmation.put(p.getUniqueId(), ids);
+                                                }
+                                            } else {
+                                                plugin.debug("Needs confirmation");
+                                                p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
+                                                Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                                ids.add(shop.getID());
+                                                needsConfirmation.put(p.getUniqueId(), ids);
+                                            }
+                                        } else {
+                                            p.sendMessage(LanguageUtils.getMessage(Message.OUT_OF_STOCK));
+                                            if (shop.getVendor().isOnline() && Config.enableVendorMessages) {
+                                                shop.getVendor().getPlayer().sendMessage(LanguageUtils.getMessage(Message.VENDOR_OUT_OF_STOCK,
+                                                        new Replacement(Placeholder.AMOUNT, String.valueOf(shop.getProduct().getAmount())),
+                                                                new Replacement(Placeholder.ITEM_NAME, LanguageUtils.getItemName(itemStack))));
+                                            }
+                                            plugin.debug("Shop is out of stock");
+                                        }
+                                    }
+                                } else {
+                                    plugin.debug(p.getName() + " doesn't have external plugin's permission");
+                                    p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY_HERE));
+                                }
                             }
+                        } else {
+                            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_BUY));
+                            plugin.debug(p.getName() + " is not permitted to buy");
                         }
+                    } else {
+                        p.sendMessage(LanguageUtils.getMessage(Message.BUYING_DISABLED));
+                        plugin.debug("Buying is disabled");
                     }
                 }
+
+            } else if ((e.getAction() == Action.LEFT_CLICK_BLOCK && !inverted) || (e.getAction() == Action.RIGHT_CLICK_BLOCK && inverted)) {
+                e.setCancelled(true);
+
+                if ((shop.getShopType() == ShopType.ADMIN) || (!shop.getVendor().getUniqueId().equals(p.getUniqueId()))) {
+                    plugin.debug(p.getName() + " wants to sell");
+
+                    if (shop.getSellPrice() > 0) {
+                        if (p.hasPermission(Permissions.SELL)) {
+                            // TODO: Outsource shop use external permission
+                            boolean externalPluginsAllowed = true;
+
+                            if (plugin.hasPlotSquared() && Config.enablePlotsquaredIntegration) {
+                                com.github.intellectualsites.plotsquared.plot.object.Location plotLocation =
+                                        new com.github.intellectualsites.plotsquared.plot.object.Location(b.getWorld().getName(), b.getX(), b.getY(), b.getZ());
+
+                                Plot plot = plotLocation.getOwnedPlot();
+                                GroupFlag flag = shop.getShopType() == Shop.ShopType.ADMIN ? PlotSquaredShopFlag.USE_ADMIN_SHOP : PlotSquaredShopFlag.USE_SHOP;
+                                
+                                externalPluginsAllowed = PlotSquaredShopFlag.isFlagAllowedOnPlot(plot, flag, p);
+                            }
+
+                            if (externalPluginsAllowed && plugin.hasWorldGuard() && Config.enableWorldGuardIntegration) {
+                                String flagName = (shop.getShopType() == ShopType.ADMIN ? "use-admin-shop" : "use-shop");
+                                WorldGuardWrapper wgWrapper = WorldGuardWrapper.getInstance();
+                                Optional<IWrappedFlag<WrappedState>> flag = wgWrapper.getFlag(flagName, WrappedState.class);
+                                if (!flag.isPresent()) plugin.debug("WorldGuard flag '" + flagName + "' is not present!");
+                                WrappedState state = flag.map(f -> wgWrapper.queryFlag(p, b.getLocation(), f).orElse(WrappedState.DENY)).orElse(WrappedState.DENY);
+                                externalPluginsAllowed = state == WrappedState.ALLOW;
+                            }
+
+                            ItemStack itemStack = shop.getProduct().getItemStack();
+
+                            if (externalPluginsAllowed || p.hasPermission(Permissions.BYPASS_EXTERNAL_PLUGIN)) {
+                                boolean stack = p.isSneaking() && !Utils.hasAxeInHand(p);
+                                int amount = stack ? itemStack.getMaxStackSize() : shop.getProduct().getAmount();
+
+                                if (Utils.getAmount(p.getInventory(), itemStack) >= amount) {
+                                    if (confirmed || !Config.confirmShopping) {
+                                        sell(p, shop, stack);
+                                        if (Config.confirmShopping) {
+                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                            ids.remove(shop.getID());
+                                            if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
+                                            else needsConfirmation.put(p.getUniqueId(), ids);
+                                        }
+                                    } else {
+                                        plugin.debug("Needs confirmation");
+                                        p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
+                                        Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                        ids.add(shop.getID());
+                                        needsConfirmation.put(p.getUniqueId(), ids);
+                                    }
+                                } else {
+                                    if (Config.autoCalculateItemAmount && Utils.getAmount(p.getInventory(), itemStack) > 0) {
+                                        if (confirmed || !Config.confirmShopping) {
+                                            sell(p, shop, stack);
+                                            if (Config.confirmShopping) {
+                                                Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                                ids.remove(shop.getID());
+                                                if (ids.isEmpty()) needsConfirmation.remove(p.getUniqueId());
+                                                else needsConfirmation.put(p.getUniqueId(), ids);
+                                            }
+                                        } else {
+                                            plugin.debug("Needs confirmation");
+                                            p.sendMessage(LanguageUtils.getMessage(Message.CLICK_TO_CONFIRM));
+                                            Set<Integer> ids = needsConfirmation.containsKey(p.getUniqueId()) ? needsConfirmation.get(p.getUniqueId()) : new HashSet<Integer>();
+                                            ids.add(shop.getID());
+                                            needsConfirmation.put(p.getUniqueId(), ids);
+                                        }
+                                    } else {
+                                        p.sendMessage(LanguageUtils.getMessage(Message.NOT_ENOUGH_ITEMS));
+                                        plugin.debug(p.getName() + " doesn't have enough items");
+                                    }
+                                }
+                            } else {
+                                plugin.debug(p.getName() + " doesn't have external plugin's permission");
+                                p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_SELL_HERE));
+                            }
+                        } else {
+                            p.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_SELL));
+                            plugin.debug(p.getName() + " is not permitted to sell");
+                        }
+                    } else {
+                        p.sendMessage(LanguageUtils.getMessage(Message.SELLING_DISABLED));
+                        plugin.debug("Selling is disabled");
+                    }
+                } else {
+                    e.setCancelled(false);
+                }
             }
         }
     }
@@ -752,17 +549,16 @@ public class ShopInteractListener implements Listener {
 
         ShopCreateEvent event = new ShopCreateEvent(executor, shop, creationPrice);
         Bukkit.getPluginManager().callEvent(event);
-
-        if (event.isCancelled()) {
+        if (event.isCancelled() && !executor.hasPermission(Permissions.CREATE_PROTECTED)) {
             plugin.debug("Create event cancelled");
+            executor.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_CREATE_PROTECTED));
             return;
         }
 
         EconomyResponse r = plugin.getEconomy().withdrawPlayer(executor, location.getWorld().getName(), creationPrice);
         if (!r.transactionSuccess()) {
             plugin.debug("Economy transaction failed: " + r.errorMessage);
-            executor.sendMessage(LanguageUtils.getMessage(Message.ERROR_OCCURRED,
-                    new Replacement(Placeholder.ERROR, r.errorMessage)));
+            executor.sendMessage(LanguageUtils.getMessage(Message.ERROR_OCCURRED, new Replacement(Placeholder.ERROR, r.errorMessage)));
             return;
         }
 
@@ -771,14 +567,8 @@ public class ShopInteractListener implements Listener {
         plugin.debug("Shop created");
         shopUtils.addShop(shop, true);
 
-        Replacement placeholder = new Replacement(
-                Placeholder.CREATION_PRICE, String.valueOf(creationPrice));
-
-        if (shopType == ShopType.ADMIN) {
-            executor.sendMessage(LanguageUtils.getMessage(Message.ADMIN_SHOP_CREATED, placeholder));
-        } else {
-            executor.sendMessage(LanguageUtils.getMessage(Message.SHOP_CREATED, placeholder));
-        }
+        Message message = shopType == ShopType.ADMIN ? Message.ADMIN_SHOP_CREATED : Message.SHOP_CREATED;
+        executor.sendMessage(LanguageUtils.getMessage(message, new Replacement(Placeholder.CREATION_PRICE, creationPrice)));
     }
 
     /**
@@ -787,6 +577,17 @@ public class ShopInteractListener implements Listener {
      * @param shop Shop to be removed
      */
     private void remove(Player executor, Shop shop) {
+        if (shop.getShopType() == ShopType.ADMIN && !executor.hasPermission(Permissions.REMOVE_ADMIN)) {
+            executor.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_REMOVE_ADMIN));
+            return;
+        }
+
+        if (shop.getShopType() == ShopType.NORMAL && !executor.getUniqueId().equals(shop.getVendor().getUniqueId())
+                && !executor.hasPermission(Permissions.REMOVE_OTHER)) {
+            executor.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_REMOVE_OTHERS));
+            return;
+        }
+
         plugin.debug(executor.getName() + " is removing " + shop.getVendor().getName() + "'s shop (#" + shop.getID() + ")");
         ShopRemoveEvent event = new ShopRemoveEvent(executor, shop);
         Bukkit.getPluginManager().callEvent(event);
@@ -817,6 +618,11 @@ public class ShopInteractListener implements Listener {
      * @param message Whether the player should receive the {@link Message#OPENED_SHOP} message
      */
     private void open(Player executor, Shop shop, boolean message) {
+        if (!executor.getUniqueId().equals(shop.getVendor().getUniqueId()) && !executor.hasPermission(Permissions.OPEN_OTHER)) {
+            executor.sendMessage(LanguageUtils.getMessage(Message.NO_PERMISSION_OPEN_OTHERS));
+            return;
+        }
+
         plugin.debug(executor.getName() + " is opening " + shop.getVendor().getName() + "'s shop (#" + shop.getID() + ")");
         ShopOpenEvent event = new ShopOpenEvent(executor, shop);
         Bukkit.getPluginManager().callEvent(event);

src/main/java/de/epiceric/shopchest/listeners/WorldGuardListener.java

@@ -1,37 +1,28 @@
 package de.epiceric.shopchest.listeners;
 
-import de.epiceric.shopchest.ShopChest;
-import de.epiceric.shopchest.config.Config;
-import de.epiceric.shopchest.nms.Hologram;
-import de.epiceric.shopchest.shop.Shop;
-import de.epiceric.shopchest.utils.ClickType;
-import de.epiceric.shopchest.utils.ClickType.EnumClickType;
+import java.util.Optional;
 
 import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.block.Chest;
-import org.bukkit.entity.ArmorStand;
-import org.bukkit.entity.Entity;
-import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
+import org.bukkit.event.Event.Result;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
-import org.bukkit.event.Event.Result;
-import org.bukkit.event.entity.EntityDamageByEntityEvent;
 import org.bukkit.event.inventory.InventoryOpenEvent;
-import org.bukkit.event.player.PlayerInteractAtEntityEvent;
 import org.bukkit.event.player.PlayerInteractEvent;
 import org.codemc.worldguardwrapper.WorldGuardWrapper;
-import org.codemc.worldguardwrapper.event.AbstractWrappedEvent;
-import org.codemc.worldguardwrapper.event.WrappedDamageEntityEvent;
 import org.codemc.worldguardwrapper.event.WrappedUseBlockEvent;
-import org.codemc.worldguardwrapper.event.WrappedUseEntityEvent;
 import org.codemc.worldguardwrapper.flag.IWrappedFlag;
 import org.codemc.worldguardwrapper.flag.WrappedState;
 
-import java.util.Optional;
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Config;
+import de.epiceric.shopchest.shop.Shop;
+import de.epiceric.shopchest.utils.ClickType;
+import de.epiceric.shopchest.utils.ClickType.EnumClickType;
 
 public class WorldGuardListener implements Listener {
 
@@ -61,7 +52,7 @@ public class WorldGuardListener implements Listener {
 
         if (shop != null) {
             // Don't show 'permission denied' messages for any kind of
-            // shop interaction even if entity/block interaction is not
+            // shop interaction even if block interaction is not
             // allowed in the region.
             return true;
         }
@@ -69,44 +60,6 @@ public class WorldGuardListener implements Listener {
         return false;
     }
 
-    private void handleEntityInteraction(Player player, Entity entity, AbstractWrappedEvent event) {
-        if (entity.getType() == EntityType.ARMOR_STAND) {
-            if (!Hologram.isPartOfHologram((ArmorStand) entity))
-                return;
-
-            for (Shop shop : plugin.getShopUtils().getShops()) {
-                if (shop.getHologram() != null && shop.getHologram().contains((ArmorStand) entity)) {
-                    if (isAllowed(player, shop.getLocation())) {
-                        event.setResult(Result.ALLOW);
-                    }
-                    return;
-                }
-            }
-        }
-    }
-
-    @EventHandler(priority = EventPriority.LOW)
-    public void onUseEntity(WrappedUseEntityEvent event) {
-        if (Config.enableWorldGuardIntegration) {
-            Player player = event.getPlayer();
-
-            if (event.getOriginalEvent() instanceof PlayerInteractAtEntityEvent) {
-                handleEntityInteraction(player, event.getEntity(), event);
-            }
-        }
-    }
-
-    @EventHandler(priority = EventPriority.LOW)
-    public void onDamageEntity(WrappedDamageEntityEvent event) {
-        if (Config.enableWorldGuardIntegration) {
-            Player player = event.getPlayer();
-
-            if (event.getOriginalEvent() instanceof EntityDamageByEntityEvent) {
-                handleEntityInteraction(player, event.getEntity(), event);
-            }
-        }
-    }
-
     @EventHandler(priority = EventPriority.LOW)
     public void onUseBlock(WrappedUseBlockEvent event) {
         if (Config.enableWorldGuardIntegration) {

src/main/java/de/epiceric/shopchest/utils/Utils.java

@@ -1,26 +1,5 @@
 package de.epiceric.shopchest.utils;
 
-import de.epiceric.shopchest.ShopChest;
-import de.epiceric.shopchest.config.Placeholder;
-import de.epiceric.shopchest.language.LanguageUtils;
-import de.epiceric.shopchest.language.Message;
-import de.epiceric.shopchest.language.Replacement;
-import de.epiceric.shopchest.nms.CustomBookMeta;
-import de.epiceric.shopchest.nms.JsonBuilder;
-
-import org.bukkit.Bukkit;
-import org.bukkit.Location;
-import org.bukkit.Material;
-import org.bukkit.configuration.InvalidConfigurationException;
-import org.bukkit.configuration.file.YamlConfiguration;
-import org.bukkit.entity.EntityType;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.Inventory;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.PlayerInventory;
-import org.bukkit.inventory.meta.*;
-import org.bukkit.util.Vector;
-
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
@@ -29,12 +8,40 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Base64;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.Chest;
+import org.bukkit.block.DoubleChest;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.inventory.meta.BookMeta;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.bukkit.util.Vector;
+
+import de.epiceric.shopchest.ShopChest;
+import de.epiceric.shopchest.config.Placeholder;
+import de.epiceric.shopchest.language.LanguageUtils;
+import de.epiceric.shopchest.language.Message;
+import de.epiceric.shopchest.language.Replacement;
+import de.epiceric.shopchest.nms.CustomBookMeta;
+import de.epiceric.shopchest.nms.JsonBuilder;
+import de.epiceric.shopchest.shop.Shop;
+
 public class Utils {
 
     /**
@@ -285,6 +292,24 @@ public class Utils {
         return true;
     }
 
+    /**
+     * Get a set for the location(s) of the shop's chest(s)
+     * @param shop The shop
+     * @return A set of 1 or 2 locations
+     */
+    public static Set<Location> getChestLocations(Shop shop) {
+        Set<Location> chestLocations = new HashSet<>();
+        InventoryHolder ih = shop.getInventoryHolder();
+        if (ih instanceof DoubleChest) {
+            DoubleChest dc = (DoubleChest) ih;
+            chestLocations.add(((Chest) dc.getLeftSide()).getLocation());
+            chestLocations.add(((Chest) dc.getRightSide()).getLocation());
+        } else {
+            chestLocations.add(shop.getLocation());
+        }
+        return chestLocations;
+    }
+
     /**
      * Send a clickable update notification to the given player.
      * @param plugin An instance of the {@link ShopChest} plugin