make vault optional and automatically enable if a server is using vault

server/src/main/java/dev/plex/hook/VaultHook.java

@@ -0,0 +1,43 @@
+package dev.plex.hook;
+
+import net.milkbowl.vault.chat.Chat;
+import net.milkbowl.vault.permission.Permission;
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.RegisteredServiceProvider;
+
+public class VaultHook
+{
+    private static Chat CHAT;
+    private static Permission PERMISSIONS;
+
+    static {
+        CHAT = setupChat();
+        PERMISSIONS = setupPermissions();
+    }
+
+    private static Chat setupChat()
+    {
+        if (!Bukkit.getPluginManager().isPluginEnabled("Vault")) return null;
+        RegisteredServiceProvider<Chat> rsp = Bukkit.getServicesManager().getRegistration(Chat.class);
+        CHAT = rsp.getProvider();
+        return CHAT;
+    }
+
+    private static Permission setupPermissions()
+    {
+        if (!Bukkit.getPluginManager().isPluginEnabled("Vault")) return null;
+        RegisteredServiceProvider<Permission> rsp = Bukkit.getServicesManager().getRegistration(Permission.class);
+        PERMISSIONS = rsp.getProvider();
+        return PERMISSIONS;
+    }
+
+    public static Permission getPermission()
+    {
+        return PERMISSIONS;
+    }
+
+    public static Chat getChat()
+    {
+        return CHAT;
+    }
+}