Begin working on permissions implementation. I don't know where every usage is but I've done a generalized implementation so far for commands.

pom.xml

@@ -40,6 +40,16 @@
 
     <repositories>
 
+        <repository>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
+        </repository>
+
+        <repository>
+            <id>networkmanager-repo</id>
+            <url>https://repo.networkmanager.xyz/repository/maven-public/</url>
+        </repository>
+
         <repository>
             <id>atlas-nexus-01-totalfreedom-development</id>
             <url>https://nexus-01.core.atlas-media.co.uk/repository/totalfreedom-development/</url>
@@ -244,6 +254,31 @@
             <artifactId>org.eclipse.sisu.inject</artifactId>
             <version>0.3.4</version>
         </dependency>
+
+        <dependency>
+            <groupId>com.github.MilkBowl</groupId>
+            <artifactId>VaultAPI</artifactId>
+            <version>1.7</version>
+            <scope>provided</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.bstats</groupId>
+                    <artifactId>bstats</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>nl.chimpgamer.networkmanager</groupId>
+            <artifactId>api</artifactId>
+            <version>2.11.4</version>
+            <scope>provided</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>io.github.slimjar</groupId>
+                    <artifactId>slimjar</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
     </dependencies>
 
     <pluginRepositories>

src/main/java/me/totalfreedom/totalfreedommod/TotalFreedomMod.java

@@ -3,6 +3,7 @@ package me.totalfreedom.totalfreedommod;
 import java.io.File;
 import java.io.InputStream;
 import java.util.Properties;
+
 import me.totalfreedom.totalfreedommod.admin.ActivityLog;
 import me.totalfreedom.totalfreedommod.admin.AdminList;
 import me.totalfreedom.totalfreedommod.banning.BanManager;
@@ -35,6 +36,10 @@ import me.totalfreedom.totalfreedommod.fun.Trailer;
 import me.totalfreedom.totalfreedommod.httpd.HTTPDaemon;
 import me.totalfreedom.totalfreedommod.permissions.PermissionConfig;
 import me.totalfreedom.totalfreedommod.permissions.PermissionManager;
+import me.totalfreedom.totalfreedommod.permissions.handler.DefaultPermissionHandler;
+import me.totalfreedom.totalfreedommod.permissions.handler.IPermissionHandler;
+import me.totalfreedom.totalfreedommod.permissions.handler.NMPermissionHandler;
+import me.totalfreedom.totalfreedommod.permissions.handler.VaultPermissionHandler;
 import me.totalfreedom.totalfreedommod.player.PlayerList;
 import me.totalfreedom.totalfreedommod.punishments.PunishmentList;
 import me.totalfreedom.totalfreedommod.rank.RankManager;
@@ -132,6 +137,8 @@ public class TotalFreedomMod extends JavaPlugin
     public WorldEditBridge web;
     public WorldGuardBridge wgb;
 
+    public IPermissionHandler permissionHandler;
+
     public static TotalFreedomMod getPlugin()
     {
         return plugin;
@@ -208,6 +215,20 @@ public class TotalFreedomMod extends JavaPlugin
 
         // Metrics @ https://bstats.org/plugin/bukkit/TotalFreedomMod/2966
         new Metrics(this, 2966);
+
+        if (getServer().getPluginManager().isPluginEnabled("NetworkManager"))
+        {
+            FLog.info("Using NetworkManager's permission handling");
+            this.permissionHandler = new NMPermissionHandler(this);
+        } else if (getServer().getPluginManager().isPluginEnabled("Vault"))
+        {
+            FLog.info("Using Vault's permission handling");
+            this.permissionHandler = new VaultPermissionHandler(this);
+        } else
+        {
+            FLog.info("Using Bukkit's native permission handling");
+            this.permissionHandler = new DefaultPermissionHandler();
+        }
     }
 
     @Override
@@ -255,8 +276,7 @@ public class TotalFreedomMod extends JavaPlugin
                 date = props.getProperty("buildDate", "unknown");
                 // Need to do this or it will display ${git.commit.id.abbrev}
                 head = props.getProperty("buildHead", "unknown").replace("${git.commit.id.abbrev}", "unknown");
-            }
+            } catch (Exception ex)
-            catch (Exception ex)
             {
                 FLog.severe("Could not load build properties! Did you compile with NetBeans/Maven?");
                 FLog.severe(ex);

src/main/java/me/totalfreedom/totalfreedommod/admin/AdminList.java

@@ -2,17 +2,22 @@ package me.totalfreedom.totalfreedommod.admin;
 
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
+
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.*;
 import java.util.concurrent.TimeUnit;
+
 import me.totalfreedom.totalfreedommod.FreedomService;
 import me.totalfreedom.totalfreedommod.config.ConfigEntry;
+import me.totalfreedom.totalfreedommod.permissions.handler.NMPermissionHandler;
+import me.totalfreedom.totalfreedommod.permissions.handler.VaultPermissionHandler;
 import me.totalfreedom.totalfreedommod.rank.Rank;
 import me.totalfreedom.totalfreedommod.util.FLog;
 import me.totalfreedom.totalfreedommod.util.FUtil;
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandSender;
+import org.bukkit.command.ConsoleCommandSender;
 import org.bukkit.entity.Player;
 
 public class AdminList extends FreedomService
@@ -55,8 +60,7 @@ public class AdminList extends FreedomService
                     allAdmins.add(admin);
                 }
             }
-        }
+        } catch (SQLException e)
-        catch (SQLException e)
         {
             FLog.severe("Failed to load admin list: " + e.getMessage());
         }
@@ -121,21 +125,41 @@ public class AdminList extends FreedomService
         {
             return true;
         }
+        if (plugin.permissionHandler instanceof NMPermissionHandler || plugin.permissionHandler instanceof VaultPermissionHandler)
+        {
+            FLog.debug("Using " + plugin.permissionHandler.getClass().getSimpleName() + " for AdminList#isAdmin");
+            return plugin.permissionHandler.inGroup(player, ConfigEntry.PERMISSIONS_GROUPS_SENIOR.getString());
+        }
+        FLog.debug("AdminList#isAdmin: Returning false because there is no permissions plugin that supports groups on the server");
+        return false;
 
-        Admin admin = getAdmin(player);
+        /*Admin admin = getAdmin(player);
 
-        return admin != null && admin.isActive();
+        return admin != null && admin.isActive();*/
     }
 
     public boolean isSeniorAdmin(CommandSender sender)
     {
-        Admin admin = getAdmin(sender);
+        //TODO: BukkitTelnet checks, but fuck that plugin
+        if (sender instanceof ConsoleCommandSender)
+        {
+            return true;
+        }
+        if (sender instanceof Player player && (plugin.permissionHandler instanceof NMPermissionHandler || plugin.permissionHandler instanceof VaultPermissionHandler))
+        {
+            FLog.debug("Using " + plugin.permissionHandler.getClass().getSimpleName() + " for AdminList#isSeniorAdmin");
+            return plugin.permissionHandler.inGroup(player, ConfigEntry.PERMISSIONS_GROUPS_SENIOR.getString());
+        }
+        FLog.debug("AdminList#isSeniorAdmin: Returning false because there is no permissions plugin that supports groups on the server");
+        return false;
+//        return plugin.permissionHandler.hasPermission(sender, "totalfreedommod.admin");
+        /*Admin admin = getAdmin(sender);
         if (admin == null)
         {
             return false;
         }
 
-        return admin.getRank().ordinal() >= Rank.SENIOR_ADMIN.ordinal();
+        return admin.getRank().ordinal() >= Rank.SENIOR_ADMIN.ordinal();*/
     }
 
     public Admin getAdmin(CommandSender sender)
@@ -271,13 +295,13 @@ public class AdminList extends FreedomService
             ResultSet currentSave = plugin.sql.getAdminByUuid(admin.getUuid());
             for (Map.Entry<String, Object> entry : admin.toSQLStorable().entrySet())
             {
-                Object storedValue = plugin.sql.getValue(currentSave, entry.getKey(), entry.getValue());                if (storedValue != null && !storedValue.equals(entry.getValue()) || storedValue == null && entry.getValue() != null || entry.getValue() == null)
+                Object storedValue = plugin.sql.getValue(currentSave, entry.getKey(), entry.getValue());
+                if (storedValue != null && !storedValue.equals(entry.getValue()) || storedValue == null && entry.getValue() != null || entry.getValue() == null)
                 {
                     plugin.sql.setAdminValue(admin, entry.getKey(), entry.getValue());
                 }
             }
-        }
+        } catch (SQLException e)
-        catch (SQLException e)
         {
             FLog.severe("Failed to save admin: " + e.getMessage());
         }

src/main/java/me/totalfreedom/totalfreedommod/command/CommandPermissions.java

@@ -10,9 +10,12 @@ public @interface CommandPermissions
 
     Rank level() default Rank.NON_OP;
 
+    String permission() default "";
+
     SourceType source() default SourceType.BOTH;
 
     boolean blockHostConsole() default false;
 
     int cooldown() default 0;
+
 }

src/main/java/me/totalfreedom/totalfreedommod/command/FreedomCommand.java

@@ -43,6 +43,8 @@ public abstract class FreedomCommand implements CommandExecutor, TabCompleter
     private final String usage;
     private final String aliases;
     private final Rank level;
+
+    private final String permission;
     private final SourceType source;
     private final boolean blockHostConsole;
     private final int cooldown;
@@ -59,6 +61,7 @@ public abstract class FreedomCommand implements CommandExecutor, TabCompleter
         this.usage = params.usage();
         this.aliases = params.aliases();
         this.level = perms.level();
+        this.permission = perms.permission().isEmpty() ? "totalfreedommod." + this.name.toLowerCase() : perms.permission();
         this.source = perms.source();
         this.blockHostConsole = perms.blockHostConsole();
         this.cooldown = perms.cooldown();
@@ -162,8 +165,48 @@ public abstract class FreedomCommand implements CommandExecutor, TabCompleter
         }
     }
 
+    @Deprecated
+    protected void checkRank(@Deprecated Rank rank, String permission)
+    {
+        //TODO: Not bothering with BukkitTelnet now.
+        if (sender instanceof Player player)
+        {
+            if (!plugin.permissionHandler.hasPermission(player, permission))
+            {
+                noPerms();
+                return;
+            }
+        }
+        if (!plugin.rm.getRank(sender).isAtLeast(rank))
+        {
+            noPerms();
+        }
+    }
+
+    protected void checkRank(String permission)
+    {
+        //TODO: Not bothering with BukkitTelnet now.
+        if (sender instanceof Player player)
+        {
+            if (!plugin.permissionHandler.hasPermission(player, permission))
+            {
+                noPerms();
+            }
+        }
+    }
+
+    @Deprecated
     protected void checkRank(Rank rank)
     {
+        //TODO: Not bothering with BukkitTelnet now.
+        if (sender instanceof Player player)
+        {
+            if (!plugin.permissionHandler.hasPermission(player, this.permission))
+            {
+                noPerms();
+                return;
+            }
+        }
         if (!plugin.rm.getRank(sender).isAtLeast(rank))
         {
             noPerms();

src/main/java/me/totalfreedom/totalfreedommod/config/ConfigEntry.java

@@ -73,6 +73,9 @@ public enum ConfigEntry
     SERVER_WHITELIST_MOTD(String.class, "server.motds.whitelist"),
     SERVER_FULL_MOTD(String.class, "server.motds.full"),
     //
+
+    PERMISSIONS_GROUPS_ADMIN(String.class, "permissions.groups.admin"),
+    PERMISSIONS_GROUPS_SENIOR(String.class, "permissions.groups.senior_admin"),
     DISCORD_TOKEN(String.class, "discord.token"),
     DISCORD_REPORT_CHANNEL_ID(String.class, "discord.report_channel_id"),
     DISCORD_CHAT_CHANNEL_ID(String.class, "discord.chat_channel_id"),

src/main/java/me/totalfreedom/totalfreedommod/httpd/module/Module_list.java

@@ -144,4 +144,5 @@ public class Module_list extends HTTPDModule
     {
         return "TotalFreedom - Online Players";
     }
+
 }

src/main/java/me/totalfreedom/totalfreedommod/permissions/handler/DefaultPermissionHandler.java

@@ -0,0 +1,43 @@
+package me.totalfreedom.totalfreedommod.permissions.handler;
+
+import org.bukkit.OfflinePlayer;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+
+/**
+ * @author Taah
+ * @project TotalFreedomMod
+ * @since 9:10 PM [23-05-2022]
+ */
+public class DefaultPermissionHandler implements IPermissionHandler
+{
+    @Override
+    public boolean hasPermission(@NotNull OfflinePlayer player, @Nullable String permission)
+    {
+        if (permission == null)
+        {
+            return true;
+        }
+        throw new UnsupportedOperationException("Unable to use Bukkit's native permission system for permissions!");
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull Player player, @Nullable String permission)
+    {
+        return permission == null || player.hasPermission(permission);
+    }
+
+    @Override
+    public boolean inGroup(@NotNull OfflinePlayer player, @Nullable String groupName)
+    {
+        throw new UnsupportedOperationException("Unable to use Bukkit's native permission system for groups!");
+    }
+
+    @Override
+    public boolean inGroup(@NotNull Player player, @Nullable String groupName)
+    {
+        throw new UnsupportedOperationException("Unable to use Bukkit's native permission system for groups!");
+    }
+}

src/main/java/me/totalfreedom/totalfreedommod/permissions/handler/IPermissionHandler.java

@@ -0,0 +1,20 @@
+package me.totalfreedom.totalfreedommod.permissions.handler;
+
+import org.bukkit.OfflinePlayer;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * @author Taah
+ * @project TotalFreedomMod
+ * @since 9:05 PM [23-05-2022]
+ */
+public interface IPermissionHandler
+{
+    boolean hasPermission(@NotNull OfflinePlayer player, @Nullable String permission);
+    boolean hasPermission(@NotNull Player player, @Nullable String permission);
+
+    boolean inGroup(@NotNull OfflinePlayer player, @Nullable String groupName);
+    boolean inGroup(@NotNull Player player, @Nullable String groupName);
+}

src/main/java/me/totalfreedom/totalfreedommod/permissions/handler/NMPermissionHandler.java

@@ -0,0 +1,95 @@
+package me.totalfreedom.totalfreedommod.permissions.handler;
+
+import me.totalfreedom.totalfreedommod.TotalFreedomMod;
+import me.totalfreedom.totalfreedommod.util.FLog;
+import net.milkbowl.vault.permission.Permission;
+import nl.chimpgamer.networkmanager.api.NetworkManagerPlugin;
+import nl.chimpgamer.networkmanager.api.NetworkManagerProvider;
+import nl.chimpgamer.networkmanager.api.models.permissions.PermissionPlayer;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.RegisteredServiceProvider;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+
+/**
+ * @author Taah
+ * @project TotalFreedomMod
+ * @since 9:10 PM [23-05-2022]
+ */
+public class NMPermissionHandler implements IPermissionHandler
+{
+    private NetworkManagerPlugin plugin;
+
+    public NMPermissionHandler(TotalFreedomMod plugin)
+    {
+        if (plugin.permissionHandler != null)
+        {
+            return;
+        }
+        if (!Bukkit.getPluginManager().isPluginEnabled("NetworkManager"))
+        {
+            plugin.permissionHandler = new DefaultPermissionHandler();
+            return;
+        }
+        this.plugin = NetworkManagerProvider.get();
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull OfflinePlayer player, @Nullable String permission)
+    {
+        if (permission == null)
+        {
+            return true;
+        }
+        PermissionPlayer permissionPlayer = this.plugin.getPermissionManager().getPermissionPlayer(player.getUniqueId());
+        if (permissionPlayer == null)
+        {
+            FLog.debug("Unable to find permissions player in NetworkManager. Returning true.");
+            return true;
+        }
+        Boolean has = permissionPlayer.hasPermission(permission);
+        if (has == null)
+        {
+            FLog.debug("NetworkManager is idiotic and has a chance of returning null on a Boolean object. Returning true.");
+            return true;
+        }
+        return has;
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull Player player, @Nullable String permission)
+    {
+        return hasPermission((OfflinePlayer) player, permission);
+    }
+
+    @Override
+    public boolean inGroup(@NotNull OfflinePlayer player, @Nullable String groupName)
+    {
+        if (groupName == null)
+        {
+            FLog.debug("NM Perms: Setting permission access to false, group is null");
+            return false;
+        }
+        PermissionPlayer permissionPlayer = this.plugin.getPermissionManager().getPermissionPlayer(player.getUniqueId());
+        if (permissionPlayer == null)
+        {
+            FLog.debug("NM Perms: Setting permission access to false, player not found in NM for '" + player.getUniqueId() + "'");
+            return false;
+        }
+        if (permissionPlayer.getGroups().isEmpty())
+        {
+            FLog.debug("NM Perms: Setting permission access to false, player groups are empty for '" + player.getUniqueId() + "'");
+            return false;
+        }
+        return permissionPlayer.getGroups().stream().anyMatch(group -> group.getName().equals(groupName));
+    }
+
+    @Override
+    public boolean inGroup(@NotNull Player player, @Nullable String groupName)
+    {
+        return this.inGroup((OfflinePlayer) player, groupName);
+    }
+}

src/main/java/me/totalfreedom/totalfreedommod/permissions/handler/VaultPermissionHandler.java

@@ -0,0 +1,103 @@
+package me.totalfreedom.totalfreedommod.permissions.handler;
+
+import me.totalfreedom.totalfreedommod.TotalFreedomMod;
+import me.totalfreedom.totalfreedommod.util.FLog;
+import net.milkbowl.vault.permission.Permission;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.RegisteredServiceProvider;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+
+/**
+ * @author Taah
+ * @project TotalFreedomMod
+ * @since 9:10 PM [23-05-2022]
+ */
+public class VaultPermissionHandler implements IPermissionHandler
+{
+    private Permission permissions;
+
+    public VaultPermissionHandler(TotalFreedomMod plugin)
+    {
+        if (plugin.permissionHandler != null)
+        {
+            return;
+        }
+        if (!Bukkit.getPluginManager().isPluginEnabled("Vault"))
+        {
+            plugin.permissionHandler = new DefaultPermissionHandler();
+            return;
+        }
+        RegisteredServiceProvider<Permission> rsp = Bukkit.getServicesManager().getRegistration(Permission.class);
+        if (rsp == null)
+        {
+            FLog.warning("Switching back to Bukkit's default permissions from Vault's due to no permission system found.");
+            plugin.permissionHandler = new DefaultPermissionHandler();
+            return;
+        }
+        this.permissions = rsp.getProvider();
+        plugin.permissionHandler = this;
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull OfflinePlayer player, @Nullable String permission)
+    {
+        if (this.permissions == null)
+        {
+            FLog.debug("Can't use Vault permissions system, there is no plugin using Vault permissions.");
+            return true;
+        }
+        return permission == null || this.permissions.playerHas(null, player, permission);
+    }
+
+    @Override
+    public boolean hasPermission(@NotNull Player player, @Nullable String permission)
+    {
+        if (this.permissions == null)
+        {
+            FLog.debug("Can't use Vault permissions system, there is no plugin using Vault permissions.");
+            return true;
+        }
+        return permission == null || this.permissions.playerHas(player, permission);
+    }
+
+    @Override
+    public boolean inGroup(@NotNull OfflinePlayer player, @Nullable String groupName)
+    {
+        if (this.permissions == null)
+        {
+            FLog.debug("Can't use Vault permissions system for groups, there is no plugin using Vault permissions.");
+            return true;
+        }
+        if (groupName == null)
+        {
+            FLog.debug("Vault Perms: Group name is null, returning false for group check");
+            return false;
+        }
+        return this.permissions.playerInGroup(null, player, groupName);
+    }
+
+    @Override
+    public boolean inGroup(@NotNull Player player, @Nullable String groupName)
+    {
+        if (this.permissions == null)
+        {
+            FLog.debug("Can't use Vault permissions system for groups, there is no plugin using Vault permissions.");
+            return false;
+        }
+        if (groupName == null)
+        {
+            FLog.debug("Vault Perms: Group name is null, returning false for group check");
+            return false;
+        }
+        return this.permissions.playerInGroup(player, groupName);
+    }
+
+    public Permission getPermissions()
+    {
+        return permissions;
+    }
+}

src/main/resources/config.yml

@@ -54,6 +54,12 @@ server:
   # What to display at the bottom of the tab list
   tablist_footer: ''
 
+# Permissions System
+permissions:
+  groups:
+    admin: "Administrator"
+    senior_admin: "Senior-Administrator"
+
 # Discord
 discord:
   # If you do not have a token, make a bot account and get one at https://discordapp.com/developers/applications/me