Fix support for WorldGuard v6.1.3 and later

pom.xml

@@ -42,10 +42,6 @@
             <id>vault-repo</id>
             <url>http://nexus.hc.to/content/repositories/pub_releases/</url>
         </repository>
-        <repository>
-            <id>sk89q-repo</id>
-            <url>http://maven.sk89q.com/artifactory/repo/</url>
-        </repository>
         <repository>
             <id>epiceric-repo</id>
             <url>http://epicericee.github.io/ShopChest/maven/</url>
@@ -68,7 +64,7 @@
         <dependency>
             <groupId>com.sk89q</groupId>
             <artifactId>worldguard</artifactId>
-            <version>6.1.1-SNAPSHOT</version>
+            <version>6.1.3-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
         <dependency>

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

@@ -68,9 +68,7 @@ public class ShopChest extends JavaPlugin {
     }
 
     @Override
-    public void onEnable() {
-        instance = this;
-
+    public void onLoad() {
         config = new Config(this);
 
         if (config.enable_debug_log) {
@@ -90,6 +88,19 @@ public class ShopChest extends JavaPlugin {
             }
         }
 
+        debug("Loading ShopChest version " + getDescription().getVersion());
+
+        Plugin worldGuardPlugin = Bukkit.getServer().getPluginManager().getPlugin("WorldGuard");
+        if (worldGuardPlugin instanceof WorldGuardPlugin) {
+            worldGuard = (WorldGuardPlugin) worldGuardPlugin;
+            ShopFlag.init(this, true);
+        }
+    }
+
+    @Override
+    public void onEnable() {
+        instance = this;
+
         debug("Enabling ShopChest version " + getDescription().getVersion());
 
         if (!getServer().getPluginManager().isPluginEnabled("Vault")) {
@@ -122,10 +133,8 @@ public class ShopChest extends JavaPlugin {
                 getLogger().warning("Plugin may still work, but more errors are expected!");
         }
 
-        Plugin worldGuardPlugin = Bukkit.getServer().getPluginManager().getPlugin("WorldGuard");
-        if (worldGuardPlugin instanceof WorldGuardPlugin) {
-            worldGuard = (WorldGuardPlugin) worldGuardPlugin;
-            ShopFlag.init();
+        if (worldGuard != null && !ShopFlag.isLoaded()) {
+            ShopFlag.init(this, false);
 
             try {
                 // Reload WorldGuard regions, so that custom flags are applied

src/main/java/de/epiceric/shopchest/worldguard/ShopFlag.java

@@ -1,9 +1,10 @@
 package de.epiceric.shopchest.worldguard;
 
+import com.google.common.collect.Lists;
 import com.sk89q.worldguard.protection.flags.DefaultFlag;
 import com.sk89q.worldguard.protection.flags.Flag;
 import com.sk89q.worldguard.protection.flags.StateFlag;
-import org.bukkit.Bukkit;
+import de.epiceric.shopchest.ShopChest;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
@@ -11,6 +12,7 @@ import java.lang.reflect.Modifier;
 public class ShopFlag {
 
     private static Flag<?>[] customFlagList;
+    private static boolean loaded = false;
 
     public static final StateFlag CREATE_SHOP;
     public static final StateFlag USE_SHOP;
@@ -24,8 +26,55 @@ public class ShopFlag {
         customFlagList = new Flag[] {CREATE_SHOP, USE_SHOP, USE_ADMIN_SHOP};
     }
 
-    public static void init() {
-        // Add custom flags to WorldGuard's flag list
+    public static boolean isLoaded() {
+        return loaded;
+    }
+
+    public static void init(final ShopChest plugin, boolean onLoad) {
+        String worldGuardVersion = plugin.getWorldGuard().getDescription().getVersion();
+
+        int majorVersion = 0;
+        int minorVersion = 0;
+        int fixVersion = 0;
+
+        try {
+            String[] spl = worldGuardVersion.split("\\.");
+            if (spl.length > 0) {
+                majorVersion = Integer.parseInt(spl[0]);
+
+                if (spl.length > 1) {
+                    minorVersion = Integer.parseInt(spl[1]);
+
+                    if (spl.length > 2) {
+                        int length = 0;
+                        for (int i = 0; i < spl[2].toCharArray().length; i++) {
+                            char c = spl[2].toCharArray()[i];
+                            if (c >= '0' && c <= '9') {
+                                length++;
+                            } else break;
+                        }
+
+                        fixVersion = Integer.parseInt(spl[2].substring(0, length));
+                    }
+                }
+            } else {
+                plugin.getLogger().severe("Failed to initialize custom WorldGuard flags.");
+                plugin.debug("Failed to initialize WorldGuard flags: Unknown/Invalid version: " + worldGuardVersion);
+                return;
+            }
+        } catch (NumberFormatException e) {
+            plugin.debug("Failed to initialize WorldGuard flags");
+            plugin.debug(e);
+            plugin.getLogger().severe("Failed to initialize custom WorldGuard flags.");
+            return;
+        }
+
+        if (((majorVersion == 6 && minorVersion == 1 && fixVersion >= 3) || (majorVersion == 6 && minorVersion > 1) || majorVersion > 6)) {
+            if (onLoad) {
+                plugin.getWorldGuard().getFlagRegistry().registerAll(Lists.newArrayList(customFlagList));
+                loaded = true;
+            }
+        } else {
             try {
                 Field flagListField = DefaultFlag.class.getField("flagsList");
 
@@ -38,8 +87,12 @@ public class ShopFlag {
                 modifiersField.setInt(flagListField, flagListField.getModifiers() & ~Modifier.FINAL);
 
                 flagListField.set(null, flags);
+                loaded = true;
             } catch (NoSuchFieldException | IllegalAccessException e) {
-            e.printStackTrace();
+                plugin.debug("Failed to initialize WorldGuard flags");
+                plugin.debug(e);
+                plugin.getLogger().severe("Failed to initialize custom WorldGuard flags.");
+            }
         }
     }