Fix recipe command on Paper

Essentials/src/com/earth2me/essentials/Essentials.java

@@ -41,6 +41,7 @@
 import net.ess3.nms.refl.providers.ReflServerStateProvider;
 import net.ess3.nms.refl.providers.ReflSpawnEggProvider;
 import net.ess3.provider.PotionMetaProvider;
+import net.ess3.provider.ProviderListener;
 import net.ess3.provider.ServerStateProvider;
 import net.ess3.provider.SpawnEggProvider;
 import net.ess3.provider.SpawnerProvider;
@@ -51,10 +52,12 @@
 import org.bukkit.block.Block;
 import org.bukkit.command.*;
 import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.HandlerList;
 import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.world.WorldLoadEvent;
 import org.bukkit.event.world.WorldUnloadEvent;
@@ -108,6 +111,7 @@ public class Essentials extends JavaPlugin implements net.ess3.api.IEssentials {
     private transient SpawnEggProvider spawnEggProvider;
     private transient PotionMetaProvider potionMetaProvider;
     private transient ServerStateProvider serverStateProvider;
+    private transient ProviderListener recipeBookEventProvider;
     private transient Kits kits;
 
     public Essentials() {
@@ -148,7 +152,7 @@ public void setupForTesting(final Server server) throws IOException, InvalidDesc
         i18n.onEnable();
         i18n.updateLocale("en");
         Console.setInstance(this);
-        
+
         LOGGER.log(Level.INFO, tl("usingTempFolderForTesting"));
         LOGGER.log(Level.INFO, dataFolder.toString());
         settings = new Settings(this);
@@ -172,7 +176,7 @@ public void onEnable() {
             i18n = new I18n(this);
             i18n.onEnable();
             execTimer.mark("I18n1");
-            
+
             Console.setInstance(this);
 
             if (!VersionUtil.isServerSupported()) {
@@ -269,6 +273,18 @@ public void onEnable() {
                     serverStateProvider = new ReflServerStateProvider(getLogger());
                 }
 
+                //Event Providers
+                if (PaperLib.isPaper()) {
+                    try {
+                        Class.forName("com.destroystokyo.paper.event.player.PlayerRecipeBookClickEvent");
+                        recipeBookEventProvider = new PaperRecipeBookListener(event -> {
+                            if (this.getUser(((PlayerEvent) event).getPlayer()).isRecipeSee()) {
+                                ((Cancellable) event).setCancelled(true);
+                            }
+                        });
+                    } catch (ClassNotFoundException ignored) {}
+                }
+
                 execTimer.mark("Init(Providers)");
                 reload();
 
@@ -362,6 +378,10 @@ private void registerListeners(PluginManager pm) {
 
         pm.registerEvents(tntListener, this);
 
+        if (recipeBookEventProvider != null) {
+            pm.registerEvents(recipeBookEventProvider, this);
+        }
+
         jails.resetListener();
     }
 

Essentials/src/com/earth2me/essentials/ISettings.java

@@ -354,8 +354,6 @@ enum KeepInvPolicy {
 
     String getItemDbType();
 
-    boolean isForceEnableRecipe();
-
     boolean allowOldIdSigns();
 
     boolean isWaterSafe();

Essentials/src/com/earth2me/essentials/Settings.java

@@ -563,7 +563,6 @@ public void reloadConfig() {
         isCompassTowardsHomePerm = _isCompassTowardsHomePerm();
         isAllowWorldInBroadcastworld = _isAllowWorldInBroadcastworld();
         itemDbType = _getItemDbType();
-        forceEnableRecipe = _isForceEnableRecipe();
         allowOldIdSigns = _allowOldIdSigns();
         isWaterSafe = _isWaterSafe();
         isSafeUsermap = _isSafeUsermap();
@@ -1626,15 +1625,6 @@ public String getItemDbType() {
 
     private boolean forceEnableRecipe; // https://github.com/EssentialsX/Essentials/issues/1397
 
-    private boolean _isForceEnableRecipe() {
-        return config.getBoolean("force-enable-recipe", false);
-    }
-
-    @Override
-    public boolean isForceEnableRecipe() {
-        return forceEnableRecipe;
-    }
-
     private boolean allowOldIdSigns;
 
     private boolean _allowOldIdSigns() {

Essentials/src/com/earth2me/essentials/commands/Commandrecipe.java

@@ -26,18 +26,19 @@ public class Commandrecipe extends EssentialsCommand {
     public Commandrecipe() {
         super("recipe");
     }
-
-    private void disableCommandForVersion1_12() throws Exception {
-        VersionUtil.BukkitVersion version = VersionUtil.getServerBukkitVersion();
-        if (version.isHigherThanOrEqualTo(VersionUtil.v1_12_0_R01)
-            && !ess.getSettings().isForceEnableRecipe()) {
-            throw new Exception("Please use the recipe book in your inventory.");
-        }
-    }
 
     @Override
     public void run(final Server server, final CommandSource sender, final String commandLabel, final String[] args) throws Exception {
-        disableCommandForVersion1_12();
+        // On versions at or above 1.12, we need recipe book API
+        if (VersionUtil.getServerBukkitVersion().isHigherThanOrEqualTo(VersionUtil.v1_12_0_R01)) {
+            try {
+                Class.forName("com.destroystokyo.paper.event.player.PlayerRecipeBookClickEvent");
+            } catch (ClassNotFoundException e) {
+                sender.sendMessage(tl("unsupportedFeature"));
+                return;
+            }
+        }
+
         if (args.length < 1) {
             throw new NotEnoughArgumentsException();
         }

providers/BaseProviders/src/net/ess3/provider/ProviderListener.java

@@ -0,0 +1,14 @@
+package net.ess3.provider;
+
+import org.bukkit.event.Event;
+import org.bukkit.event.Listener;
+
+import java.util.function.Consumer;
+
+public abstract class ProviderListener implements Provider, Listener {
+    protected Consumer<Event> function;
+
+    public ProviderListener(Consumer<Event> function) {
+        this.function = function;
+    }
+}

providers/PaperProvider/src/net/ess3/provider/providers/PaperRecipeBookListener.java

@@ -0,0 +1,24 @@
+package net.ess3.provider.providers;
+
+import com.destroystokyo.paper.event.player.PlayerRecipeBookClickEvent;
+import net.ess3.provider.ProviderListener;
+import org.bukkit.event.Event;
+import org.bukkit.event.EventHandler;
+
+import java.util.function.Consumer;
+
+public class PaperRecipeBookListener extends ProviderListener {
+    public PaperRecipeBookListener(Consumer<Event> function) {
+        super(function);
+    }
+
+    @EventHandler
+    public void onPlayerRecipeBookClick(PlayerRecipeBookClickEvent event) {
+        function.accept(event);
+    }
+
+    @Override
+    public String getDescription() {
+        return "Paper Player Recipe Book Click Event Provider";
+    }
+}