Add floodgate support, release candidate 2.

10 files changed, 201 insertions, 71 deletions

diff --git a/build.gradle b/build.gradle
index 36c0bc3..fab4327 100644
--- a/build.gradle
+++ b/build.gradle
@@ -9,7 +9,7 @@ plugins {
 }
 
 setGroup("net.elytrium")
-setVersion("1.0.3-rc1")
+setVersion("1.0.3-rc2")
 
 compileJava {
     getOptions().setEncoding("UTF-8")
@@ -28,17 +28,23 @@ repositories {
         setUrl("https://papermc.io/repo/repository/maven-public/")
     }
     maven {
+        setName("opencollab-repo")
+        setUrl("https://repo.opencollab.dev/maven-snapshots/")
+    }
+    maven {
         setName("elytrium-repo")
         setUrl("https://maven.elytrium.net/repo/")
     }
 }
 
 dependencies {
-    compileOnly("net.elytrium:limboapi-api:1.0.3-rc1")
+    compileOnly("net.elytrium:limboapi-api:1.0.3-rc2")
 
     compileOnly("com.velocitypowered:velocity-api:3.1.2-SNAPSHOT")
     annotationProcessor("com.velocitypowered:velocity-api:3.1.2-SNAPSHOT")
 
+    compileOnly("org.geysermc.floodgate:api:2.1.1-SNAPSHOT")
+
     implementation("at.favre.lib:bcrypt:0.9.0")
     implementation("dev.samstevens.totp:totp:1.7.1")
 
diff --git a/config/spotbugs/suppressions.xml b/config/spotbugs/suppressions.xml
index 3b4b6f6..eb21bfb 100644
--- a/config/spotbugs/suppressions.xml
+++ b/config/spotbugs/suppressions.xml
@@ -2,6 +2,9 @@
 
 <FindBugsFilter>
     <Match>
+        <Bug pattern="EI_EXPOSE_REP"/>
+    </Match>
+    <Match>
         <Bug pattern="EI_EXPOSE_REP2"/>
     </Match>
 </FindBugsFilter>
diff --git a/src/main/java/net/elytrium/limboauth/LimboAuth.java b/src/main/java/net/elytrium/limboauth/LimboAuth.java
index a86f3c5..85c3b08 100644
--- a/src/main/java/net/elytrium/limboauth/LimboAuth.java
+++ b/src/main/java/net/elytrium/limboauth/LimboAuth.java
@@ -18,7 +18,6 @@
 package net.elytrium.limboauth;
 
 import com.google.inject.Inject;
-import com.google.inject.name.Named;
 import com.j256.ormlite.dao.Dao;
 import com.j256.ormlite.dao.DaoManager;
 import com.j256.ormlite.field.FieldType;
@@ -34,7 +33,6 @@ import com.velocitypowered.api.plugin.PluginContainer;
 import com.velocitypowered.api.plugin.annotation.DataDirectory;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.ProxyServer;
-import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.io.File;
 import java.io.IOException;
 import java.net.InetAddress;
@@ -54,6 +52,7 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
+import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
@@ -73,12 +72,14 @@ import net.elytrium.limboauth.command.LimboAuthCommand;
 import net.elytrium.limboauth.command.PremiumCommand;
 import net.elytrium.limboauth.command.TotpCommand;
 import net.elytrium.limboauth.command.UnregisterCommand;
+import net.elytrium.limboauth.floodgate.FloodgateApiHolder;
 import net.elytrium.limboauth.handler.AuthSessionHandler;
 import net.elytrium.limboauth.listener.AuthListener;
 import net.elytrium.limboauth.model.RegisteredPlayer;
 import net.elytrium.limboauth.utils.UpdatesChecker;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import net.kyori.adventure.title.Title;
 import org.bstats.velocity.Metrics;
 import org.slf4j.Logger;
 
@@ -87,13 +88,20 @@ import org.slf4j.Logger;
     name = "LimboAuth",
     version = BuildConstants.AUTH_VERSION,
     url = "https://elytrium.net/",
-    authors = {"hevav", "mdxd44"},
-    dependencies = {@Dependency(id = "limboapi")}
+    authors = {
+        "hevav",
+        "mdxd44"
+    },
+    dependencies = {
+        @Dependency(id = "limboapi"),
+        @Dependency(id = "floodgate", optional = true)
+    }
 )
-@SuppressFBWarnings({"EI_EXPOSE_REP", "MS_EXPOSE_REP"})
 public class LimboAuth {
 
-  private static LimboAuth instance;
+  private final Map<String, CachedUser> cachedAuthChecks = new ConcurrentHashMap<>();
+  private final Map<UUID, Runnable> postLoginTasks = new ConcurrentHashMap<>();
+  private final Set<String> unsafePasswords = new HashSet<>();
 
   private final HttpClient client = HttpClient.newHttpClient();
   private final ProxyServer server;
@@ -101,25 +109,27 @@ public class LimboAuth {
   private final Metrics.Factory metricsFactory;
   private final Path dataDirectory;
   private final LimboFactory factory;
+  private final FloodgateApiHolder floodgateApi;
 
-  private final Set<String> unsafePasswords = new HashSet<>();
-  private Map<String, CachedUser> cachedAuthChecks;
   private Dao<RegisteredPlayer, String> playerDao;
   private Pattern nicknameValidationPattern;
   private Limbo authServer;
   private Component nicknameInvalid;
 
   @Inject
-  @SuppressWarnings("OptionalGetWithoutIsPresent")
-  public LimboAuth(ProxyServer server, Logger logger, Metrics.Factory metricsFactory,
-      @Named("limboapi") PluginContainer factory, @DataDirectory Path dataDirectory) {
-    setInstance(this);
-
+  public LimboAuth(ProxyServer server, Logger logger, Metrics.Factory metricsFactory, @DataDirectory Path dataDirectory) {
     this.server = server;
     this.logger = logger;
     this.metricsFactory = metricsFactory;
     this.dataDirectory = dataDirectory;
-    this.factory = (LimboFactory) factory.getInstance().get();
+
+    this.factory = (LimboFactory) this.server.getPluginManager().getPlugin("limboapi").flatMap(PluginContainer::getInstance).orElseThrow();
+
+    if (this.server.getPluginManager().getPlugin("floodgate").isPresent()) {
+      this.floodgateApi = new FloodgateApiHolder();
+    } else {
+      this.floodgateApi = null;
+    }
   }
 
   @Subscribe
@@ -136,17 +146,21 @@ public class LimboAuth {
   public void reload() throws Exception {
     Settings.IMP.reload(new File(this.dataDirectory.toFile().getAbsoluteFile(), "config.yml"));
 
+    if (this.floodgateApi == null && !Settings.IMP.MAIN.FLOODGATE_NEED_AUTH) {
+      throw new IllegalStateException("If you don't need to auth floodgate players please install floodgate plugin.");
+    }
+
     if (Settings.IMP.MAIN.CHECK_PASSWORD_STRENGTH) {
       this.unsafePasswords.clear();
-      Path unsafePasswordsFile = Paths.get(this.dataDirectory.toFile().getAbsolutePath(), Settings.IMP.MAIN.UNSAFE_PASSWORDS_FILE);
-      if (!unsafePasswordsFile.toFile().exists()) {
-        Files.copy(Objects.requireNonNull(this.getClass().getResourceAsStream("/unsafe_passwords.txt")), unsafePasswordsFile);
+      Path unsafePasswordsPath = Paths.get(this.dataDirectory.toFile().getAbsolutePath(), Settings.IMP.MAIN.UNSAFE_PASSWORDS_FILE);
+      if (!unsafePasswordsPath.toFile().exists()) {
+        Files.copy(Objects.requireNonNull(this.getClass().getResourceAsStream("/unsafe_passwords.txt")), unsafePasswordsPath);
       }
 
-      this.unsafePasswords.addAll(Files.lines(unsafePasswordsFile).collect(Collectors.toSet()));
+      this.unsafePasswords.addAll(Files.lines(unsafePasswordsPath).collect(Collectors.toSet()));
     }
 
-    this.cachedAuthChecks = new ConcurrentHashMap<>();
+    this.cachedAuthChecks.clear();
 
     Settings.DATABASE dbConfig = Settings.IMP.DATABASE;
     JdbcPooledConnectionSource connectionSource;
@@ -205,7 +219,7 @@ public class LimboAuth {
     if (Settings.IMP.MAIN.ENABLE_TOTP) {
       manager.register("2fa", new TotpCommand(this.playerDao), "totp");
     }
-    manager.register("limboauth", new LimboAuthCommand(), "la", "auth", "lauth");
+    manager.register("limboauth", new LimboAuthCommand(this), "la", "auth", "lauth");
 
     Settings.MAIN.AUTH_COORDS authCoords = Settings.IMP.MAIN.AUTH_COORDS;
     VirtualWorld authWorld = this.factory.createVirtualWorld(
@@ -242,7 +256,7 @@ public class LimboAuth {
     this.nicknameInvalid = LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.NICKNAME_INVALID_KICK);
 
     this.server.getEventManager().unregisterListeners(this);
-    this.server.getEventManager().register(this, new AuthListener(this.playerDao));
+    this.server.getEventManager().register(this, new AuthListener(this, this.playerDao));
 
     Executors.newScheduledThreadPool(1, task -> new Thread(task, "purge-cache")).scheduleAtFixedRate(() ->
         this.checkCache(this.cachedAuthChecks, Settings.IMP.MAIN.PURGE_CACHE_MILLIS),
@@ -282,7 +296,7 @@ public class LimboAuth {
       tables.forEach(t -> {
         try {
           String columnDefinition = t.getColumnDefinition();
-          StringBuilder builder = new StringBuilder("ALTER TABLE `auth` ADD ");
+          StringBuilder builder = new StringBuilder("ALTER TABLE `AUTH` ADD ");
           List<String> dummy = new ArrayList<>();
           if (columnDefinition == null) {
             playerDao.getConnectionSource().getDatabaseType().appendColumnArg(t.getTableName(), builder, t, dummy, dummy, dummy, dummy);
@@ -313,12 +327,11 @@ public class LimboAuth {
 
   public boolean needAuth(Player player) {
     String username = player.getUsername();
-
     if (!this.cachedAuthChecks.containsKey(username)) {
       return true;
+    } else {
+      return !this.cachedAuthChecks.get(username).getInetAddress().equals(player.getRemoteAddress().getAddress());
     }
-
-    return !this.cachedAuthChecks.get(username).getInetAddress().equals(player.getRemoteAddress().getAddress());
   }
 
   public void authPlayer(Player player) {
@@ -329,10 +342,41 @@ public class LimboAuth {
     }
 
     RegisteredPlayer registeredPlayer = AuthSessionHandler.fetchInfo(this.playerDao, nickname);
-    if (player.isOnlineMode()) {
+    boolean onlineMode = player.isOnlineMode();
+    if (onlineMode || (!Settings.IMP.MAIN.FLOODGATE_NEED_AUTH && this.floodgateApi.isFloodgatePlayer(player.getUniqueId()))) {
       if (registeredPlayer == null || registeredPlayer.getHash().isEmpty()) {
         registeredPlayer = AuthSessionHandler.fetchInfo(this.playerDao, player.getUniqueId());
         if (registeredPlayer == null || registeredPlayer.getHash().isEmpty()) {
+          // Due to the current connection state, which is set to LOGIN there, we cannot send the packets.
+          // We need to wait for the PLAY connection state to set.
+          this.postLoginTasks.put(player.getUniqueId(), () -> {
+            if (onlineMode) {
+              if (!Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM.isEmpty()) {
+                player.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM));
+              }
+              if (!Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM_TITLE.isEmpty() && !Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM_SUBTITLE.isEmpty()) {
+                player.showTitle(
+                    Title.title(
+                        LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM_TITLE),
+                        LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_PREMIUM_SUBTITLE)
+                    )
+                );
+              }
+            } else {
+              if (!Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE.isEmpty()) {
+                player.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE));
+              }
+              if (!Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE_TITLE.isEmpty() && !Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE_SUBTITLE.isEmpty()) {
+                player.showTitle(
+                    Title.title(
+                        LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE_TITLE),
+                        LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.LOGIN_FLOODGATE_SUBTITLE)
+                    )
+                );
+              }
+            }
+          });
+
           this.factory.passLoginLimbo(player);
           return;
         }
@@ -364,23 +408,24 @@ public class LimboAuth {
   public boolean isPremium(String nickname) {
     try {
       if (this.isPremiumExternal(nickname)) {
-        QueryBuilder<RegisteredPlayer, String> query = this.playerDao.queryBuilder();
-        query.where()
+        QueryBuilder<RegisteredPlayer, String> premiumRegisteredQuery = this.playerDao.queryBuilder();
+        premiumRegisteredQuery.where()
             .eq("LOWERCASENICKNAME", nickname.toLowerCase(Locale.ROOT))
             .and()
             .ne("HASH", "");
-        query.setCountOf(true);
-        QueryBuilder<RegisteredPlayer, String> query2 = this.playerDao.queryBuilder();
-        query2.where()
+        premiumRegisteredQuery.setCountOf(true);
+
+        QueryBuilder<RegisteredPlayer, String> premiumUnregisteredQuery = this.playerDao.queryBuilder();
+        premiumUnregisteredQuery.where()
             .eq("LOWERCASENICKNAME", nickname.toLowerCase(Locale.ROOT))
             .and()
             .eq("HASH", "");
-        query2.setCountOf(true);
+        premiumUnregisteredQuery.setCountOf(true);
+
         if (Settings.IMP.MAIN.ONLINE_MODE_NEED_AUTH) {
-          return this.playerDao.countOf(query.prepare()) == 0
-              && this.playerDao.countOf(query2.prepare()) != 0;
+          return this.playerDao.countOf(premiumRegisteredQuery.prepare()) == 0 && this.playerDao.countOf(premiumUnregisteredQuery.prepare()) != 0;
         } else {
-          return this.playerDao.countOf(query.prepare()) == 0;
+          return this.playerDao.countOf(premiumRegisteredQuery.prepare()) == 0;
         }
       } else {
         return false;
@@ -398,18 +443,14 @@ public class LimboAuth {
         .forEach(userMap::remove);
   }
 
-  private static void setInstance(LimboAuth instance) {
-    LimboAuth.instance = instance;
-  }
-
-  public static LimboAuth getInstance() {
-    return instance;
-  }
-
   public Set<String> getUnsafePasswords() {
     return this.unsafePasswords;
   }
 
+  public Map<UUID, Runnable> getPostLoginTasks() {
+    return this.postLoginTasks;
+  }
+
   public Logger getLogger() {
     return this.logger;
   }
diff --git a/src/main/java/net/elytrium/limboauth/Settings.java b/src/main/java/net/elytrium/limboauth/Settings.java
index f32279b..bbae307 100644
--- a/src/main/java/net/elytrium/limboauth/Settings.java
+++ b/src/main/java/net/elytrium/limboauth/Settings.java
@@ -48,7 +48,11 @@ public class Settings extends Config {
     public boolean CHECK_PASSWORD_STRENGTH = true;
     public String UNSAFE_PASSWORDS_FILE = "unsafe_passwords.txt";
     public boolean ONLINE_MODE_NEED_AUTH = true;
+    @Comment("Needs floodgate plugin.")
+    public boolean FLOODGATE_NEED_AUTH = true;
     public boolean FORCE_OFFLINE_UUID = false;
+    @Comment("Delay in milliseconds before sending auth-confirming titles and messages to the player. (login-premium-title, login-floodgate, etc.)")
+    public int PREMIUM_AND_FLOODGATE_MESSAGES_DELAY = 1250;
     @Comment({
         "Forcibly set player's UUID to the value from the database",
         "If the player had the cracked account, and switched to the premium account, the cracked UUID will be used."
@@ -122,7 +126,7 @@ public class Settings extends Config {
     @Create
     public MAIN.STRINGS STRINGS;
 
-    @Comment("Leave title fields empty to disable.")
+    @Comment("You can left blank the fields marked with \"*\" comment.")
     public static class STRINGS {
 
       public String RELOAD = "{PRFX} &aReloaded successfully!";
@@ -142,13 +146,30 @@ public class Settings extends Config {
       public String BOSSBAR = "{PRFX} You have &6{0} &fseconds left to log in.";
       public String TIMES_UP = "{PRFX}{NL}&cAuthorization time is up.";
 
+      @Comment("*")
+      public String LOGIN_PREMIUM = "{PRFX} You've been logged in automatically using the premium account!";
+      @Comment("*")
+      public String LOGIN_PREMIUM_TITLE = "{PRFX} Welcome!";
+      @Comment("*")
+      public String LOGIN_PREMIUM_SUBTITLE = "&aYou has been logged in as premium player!";
+      @Comment("*")
+      public String LOGIN_FLOODGATE = "{PRFX} You've been logged in automatically using the bedrock account!";
+      @Comment("*")
+      public String LOGIN_FLOODGATE_TITLE = "{PRFX} Welcome!";
+      @Comment("*")
+      public String LOGIN_FLOODGATE_SUBTITLE = "&aYou has been logged in as bedrock player!";
+
       public String LOGIN = "{PRFX} &aPlease, login using &6/login <password>&a, you have &6{0} &aattempts.";
       public String LOGIN_WRONG_PASSWORD = "{PRFX} &cYou''ve entered the wrong password, you have &6{0} &cattempts left.";
       public String LOGIN_WRONG_PASSWORD_KICK = "{PRFX}{NL}&cYou've entered the wrong password numerous times!";
       public String LOGIN_SUCCESSFUL = "{PRFX} &aSuccessfully logged in!";
+      @Comment("*")
       public String LOGIN_TITLE = "&fPlease, login using &6/login <password>&a.";
+      @Comment("*")
       public String LOGIN_SUBTITLE = "&aYou have &6{0} &aattempts.";
+      @Comment("*")
       public String LOGIN_SUCCESSFUL_TITLE = "{PRFX}";
+      @Comment("*")
       public String LOGIN_SUCCESSFUL_SUBTITLE = "&aSuccessfully logged in!";
 
       @Comment("Or if register-need-repeat-password set to false remove the \"<repeat password>\" part.")
@@ -158,9 +179,13 @@ public class Settings extends Config {
       public String REGISTER_PASSWORD_TOO_LONG = "{PRFX} &cYou entered too long password, use a different one!";
       public String REGISTER_PASSWORD_UNSAFE = "{PRFX} &cYour password is unsafe, use a different one!";
       public String REGISTER_SUCCESSFUL = "{PRFX} &aSuccessfully registered!";
+      @Comment("*")
       public String REGISTER_TITLE = "{PRFX}";
+      @Comment("*")
       public String REGISTER_SUBTITLE = "&aPlease, register using &6/register <password> <repeat password>";
+      @Comment("*")
       public String REGISTER_SUCCESSFUL_TITLE = "{PRFX}";
+      @Comment("*")
       public String REGISTER_SUCCESSFUL_SUBTITLE = "&aSuccessfully registered!";
 
       public String UNREGISTER_SUCCESSFUL = "{PRFX}{NL}&aSuccessfully unregistered!";
@@ -186,7 +211,9 @@ public class Settings extends Config {
       public String FORCE_CHANGE_PASSWORD_USAGE = "{PRFX} Usage: &6/forcechangepassword <nickname> <new password>";
 
       public String TOTP = "{PRFX} Please, enter your 2FA key using &6/2fa <key>";
+      @Comment("*")
       public String TOTP_TITLE = "{PRFX}";
+      @Comment("*")
       public String TOTP_SUBTITLE = "&aEnter your 2FA key using &6/2fa <key>";
       public String TOTP_SUCCESSFUL = "{PRFX} &aSuccessfully enabled 2FA!";
       public String TOTP_DISABLED = "{PRFX} &aSuccessfully disabled 2FA!";
diff --git a/src/main/java/net/elytrium/limboauth/command/LimboAuthCommand.java b/src/main/java/net/elytrium/limboauth/command/LimboAuthCommand.java
index 611b1c3..1465023 100644
--- a/src/main/java/net/elytrium/limboauth/command/LimboAuthCommand.java
+++ b/src/main/java/net/elytrium/limboauth/command/LimboAuthCommand.java
@@ -30,6 +30,12 @@ import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 
 public class LimboAuthCommand implements SimpleCommand {
 
+  private final LimboAuth plugin;
+
+  public LimboAuthCommand(LimboAuth plugin) {
+    this.plugin = plugin;
+  }
+
   @Override
   public List<String> suggest(SimpleCommand.Invocation invocation) {
     CommandSource source = invocation.source();
@@ -57,7 +63,7 @@ public class LimboAuthCommand implements SimpleCommand {
     if (args.length == 1) {
       if (args[0].equalsIgnoreCase("reload") && source.hasPermission("limboauth.admin.reload")) {
         try {
-          LimboAuth.getInstance().reload();
+          this.plugin.reload();
           source.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.RELOAD));
         } catch (Exception e) {
           source.sendMessage(LegacyComponentSerializer.legacyAmpersand().deserialize(Settings.IMP.MAIN.STRINGS.RELOAD_FAILED));
diff --git a/src/main/java/net/elytrium/limboauth/config/Config.java b/src/main/java/net/elytrium/limboauth/config/Config.java
index 1cb9803..6effa5d 100644
--- a/src/main/java/net/elytrium/limboauth/config/Config.java
+++ b/src/main/java/net/elytrium/limboauth/config/Config.java
@@ -39,13 +39,14 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
-import net.elytrium.limboauth.LimboAuth;
 import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.yaml.snakeyaml.Yaml;
 
 public class Config {
 
-  private static final Logger LOGGER = LimboAuth.getInstance().getLogger();
+  private final Logger logger = LoggerFactory.getLogger(Config.class);
+
   private String oldPrefix = "";
   private String currentPrefix = "";
 
@@ -76,7 +77,7 @@ public class Config {
       }
     }
 
-    LOGGER.debug("Failed to set config option: " + key + ": " + value + " | " + instance + " | " + root.getSimpleName() + ".yml");
+    this.logger.debug("Failed to set config option: " + key + ": " + value + " | " + instance + " | " + root.getSimpleName() + ".yml");
   }
 
   @SuppressWarnings("unchecked")
@@ -109,7 +110,7 @@ public class Config {
     try (InputStreamReader reader = new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8)) {
       this.set(new Yaml().load(reader), "");
     } catch (IOException e) {
-      LOGGER.warn("Unable to load config ", e);
+      this.logger.warn("Unable to load config", e);
       return false;
     }
 
@@ -211,7 +212,7 @@ public class Config {
   private void save(PrintWriter writer, Class<?> clazz, Object instance, int indent) {
     try {
       String lineSeparator = System.lineSeparator();
-      String spacing = this.repeat(" ", indent);
+      String spacing = IntStream.range(0, indent).mapToObj(i -> " ").collect(Collectors.joining());
 
       for (Field field : clazz.getFields()) {
         if (field.getAnnotation(Ignore.class) != null) {
@@ -271,7 +272,7 @@ public class Config {
       this.setAccessible(field);
       return field;
     } catch (Throwable ignored) {
-      LOGGER.debug("Invalid config field: " + this.join(split, ".") + " for " + this.toNodeName(instance.getClass().getSimpleName()));
+      this.logger.debug("Invalid config field: " + this.join(split, ".") + " for " + this.toNodeName(instance.getClass().getSimpleName()));
       return null;
     }
   }
@@ -368,11 +369,6 @@ public class Config {
   }
 
   @SuppressWarnings("SameParameterValue")
-  private String repeat(String s, int n) {
-    return IntStream.range(0, n).mapToObj(i -> s).collect(Collectors.joining());
-  }
-
-  @SuppressWarnings("SameParameterValue")
   private String join(Object[] array, String delimiter) {
     switch (array.length) {
       case 0: {
diff --git a/src/main/java/net/elytrium/limboauth/floodgate/FloodgateApiHolder.java b/src/main/java/net/elytrium/limboauth/floodgate/FloodgateApiHolder.java
new file mode 100644
index 0000000..8832d4b
--- /dev/null
+++ b/src/main/java/net/elytrium/limboauth/floodgate/FloodgateApiHolder.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021 Elytrium
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.elytrium.limboauth.floodgate;
+
+import java.util.UUID;
+import org.geysermc.floodgate.api.FloodgateApi;
+
+/**
+ * Holder class for optional floodgate feature, we can't inject of optional plugins without holders due to Velocity structure.
+ */
+public class FloodgateApiHolder {
+
+  private final FloodgateApi floodgateApi;
+
+  public FloodgateApiHolder() {
+    this.floodgateApi = FloodgateApi.getInstance();
+  }
+
+  public boolean isFloodgatePlayer(UUID uuid) {
+    return this.floodgateApi.isFloodgatePlayer(uuid);
+  }
+}
diff --git a/src/main/java/net/elytrium/limboauth/listener/AuthListener.java b/src/main/java/net/elytrium/limboauth/listener/AuthListener.java
index 0b0db2c..62d001c 100644
--- a/src/main/java/net/elytrium/limboauth/listener/AuthListener.java
+++ b/src/main/java/net/elytrium/limboauth/listener/AuthListener.java
@@ -20,10 +20,13 @@ package net.elytrium.limboauth.listener;
 import com.j256.ormlite.dao.Dao;
 import com.j256.ormlite.stmt.UpdateBuilder;
 import com.velocitypowered.api.event.Subscribe;
+import com.velocitypowered.api.event.connection.PostLoginEvent;
 import com.velocitypowered.api.event.connection.PreLoginEvent;
 import com.velocitypowered.api.util.UuidUtils;
 import java.sql.SQLException;
+import java.util.Map;
 import java.util.UUID;
+import java.util.concurrent.TimeUnit;
 import net.elytrium.limboapi.api.event.LoginLimboRegisterEvent;
 import net.elytrium.limboapi.api.event.SafeGameProfileRequestEvent;
 import net.elytrium.limboauth.LimboAuth;
@@ -34,16 +37,18 @@ import net.elytrium.limboauth.model.RegisteredPlayer;
 // TODO: Customizable events priority
 public class AuthListener {
 
+  private final LimboAuth plugin;
   private final Dao<RegisteredPlayer, String> playerDao;
 
-  public AuthListener(Dao<RegisteredPlayer, String> playerDao) {
+  public AuthListener(LimboAuth plugin, Dao<RegisteredPlayer, String> playerDao) {
+    this.plugin = plugin;
     this.playerDao = playerDao;
   }
 
   @Subscribe
-  public void onProxyConnect(PreLoginEvent event) {
+  public void onPreLoginEvent(PreLoginEvent event) {
     if (!event.getResult().isForceOfflineMode()) {
-      if (!LimboAuth.getInstance().isPremium(event.getUsername())) {
+      if (!this.plugin.isPremium(event.getUsername())) {
         event.setResult(PreLoginEvent.PreLoginComponentResult.forceOfflineMode());
       } else {
         event.setResult(PreLoginEvent.PreLoginComponentResult.forceOnlineMode());
@@ -52,14 +57,26 @@ public class AuthListener {
   }
 
   @Subscribe
-  public void onLogin(LoginLimboRegisterEvent event) {
-    if (LimboAuth.getInstance().needAuth(event.getPlayer())) {
-      event.addCallback(() -> LimboAuth.getInstance().authPlayer(event.getPlayer()));
+  public void onPostLogin(PostLoginEvent event) {
+    Map<UUID, Runnable> postLoginTasks = this.plugin.getPostLoginTasks();
+    UUID uuid = event.getPlayer().getUniqueId();
+    if (postLoginTasks.containsKey(uuid)) {
+      // We need to delay for player's client to finish switching the server, it takes a little time.
+      this.plugin.getServer().getScheduler().buildTask(
+          this.plugin, () -> postLoginTasks.get(uuid).run()
+      ).delay(Settings.IMP.MAIN.PREMIUM_AND_FLOODGATE_MESSAGES_DELAY, TimeUnit.MILLISECONDS).schedule();
     }
   }
 
   @Subscribe
-  public void onProfile(SafeGameProfileRequestEvent event) {
+  public void onLoginLimboRegister(LoginLimboRegisterEvent event) {
+    if (this.plugin.needAuth(event.getPlayer())) {
+      event.addCallback(() -> this.plugin.authPlayer(event.getPlayer()));
+    }
+  }
+
+  @Subscribe
+  public void onGameProfileRequest(SafeGameProfileRequestEvent event) {
     if (Settings.IMP.MAIN.SAVE_UUID) {
       RegisteredPlayer registeredPlayer = AuthSessionHandler.fetchInfo(this.playerDao, event.getOriginalProfile().getId());
 
@@ -67,15 +84,12 @@ public class AuthListener {
         event.setGameProfile(event.getOriginalProfile().withId(UUID.fromString(registeredPlayer.getUuid())));
         return;
       }
-
       registeredPlayer = AuthSessionHandler.fetchInfo(this.playerDao, event.getUsername());
 
       if (registeredPlayer != null) {
         String currentUuid = registeredPlayer.getUuid();
 
-        if (event.isOnlineMode()
-            && registeredPlayer.getHash().isEmpty()
-            && registeredPlayer.getPremiumUuid().isEmpty()) {
+        if (event.isOnlineMode() && registeredPlayer.getHash().isEmpty() && registeredPlayer.getPremiumUuid().isEmpty()) {
           try {
             registeredPlayer.setPremiumUuid(event.getOriginalProfile().getId().toString());
             this.playerDao.update(registeredPlayer);
diff --git a/src/main/java/net/elytrium/limboauth/utils/UpdatesChecker.java b/src/main/java/net/elytrium/limboauth/utils/UpdatesChecker.java
index 71af1bb..79a2998 100644
--- a/src/main/java/net/elytrium/limboauth/utils/UpdatesChecker.java
+++ b/src/main/java/net/elytrium/limboauth/utils/UpdatesChecker.java
@@ -67,7 +67,7 @@ public class UpdatesChecker {
   private static String getCleanVersion(String version) {
     int indexOf = version.indexOf("-");
     if (indexOf > 0) {
-      return version.substring(0, indexOf) + "$"; // "$" - Indicates that the version is snapshot
+      return version.substring(0, indexOf) + "$"; // "$" - Indicates that the version is not release.
     } else {
       return version;
     }
diff --git a/src/main/templates/net/elytrium/limboauth/BuildConstants.java b/src/main/templates/net/elytrium/limboauth/BuildConstants.java
index b8d7966..855bc88 100644
--- a/src/main/templates/net/elytrium/limboauth/BuildConstants.java
+++ b/src/main/templates/net/elytrium/limboauth/BuildConstants.java
@@ -17,7 +17,7 @@
 
 package net.elytrium.limboauth;
 
-// The constants are replaced before compilation
+// The constants are replaced before compilation.
 public class BuildConstants {
 
   public static final String AUTH_VERSION = "${version}";