Manually append Floodgate Prefixes

This can be used as a workaround for TuxCoding#493
This will leave
https://github.com/GeyserMC/Floodgate/blob/821be02bdb179f7d4ba7b0ec79bbc721c28105f5/spigot/src/main/java/org/geysermc/floodgate/addon/data/SpigotDataHandler.java
in a limbo state, but it shouldn't have a noticable impact on neither
performance nor stability.
This commit will try append prefixes to every player, even if it's not
needed of if Floodgate isn't installed.

Author: Smart123s

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/FastLoginBukkit.java

@@ -25,10 +25,12 @@
  */
 package com.github.games647.fastlogin.bukkit;
 
+import com.comphenix.protocol.ProtocolLibrary;
 import com.github.games647.fastlogin.bukkit.command.CrackedCommand;
 import com.github.games647.fastlogin.bukkit.command.PremiumCommand;
 import com.github.games647.fastlogin.bukkit.listener.ConnectionListener;
 import com.github.games647.fastlogin.bukkit.listener.PaperCacheListener;
+import com.github.games647.fastlogin.bukkit.listener.protocollib.ManualNameChange;
 import com.github.games647.fastlogin.bukkit.listener.protocollib.ProtocolLibListener;
 import com.github.games647.fastlogin.bukkit.listener.protocollib.SkinApplyListener;
 import com.github.games647.fastlogin.bukkit.listener.protocolsupport.ProtocolSupportListener;
@@ -115,6 +117,8 @@ public void onEnable() {
                 pluginManager.registerEvents(new ProtocolSupportListener(this, core.getRateLimiter()), this);
             } else if (pluginManager.isPluginEnabled("ProtocolLib")) {
                 ProtocolLibListener.register(this, core.getRateLimiter());
+                //TODO: make configurable & check if it's needed
+                ProtocolLibrary.getProtocolManager().addPacketListener(new ManualNameChange(this));
 
                 //if server is using paper - we need to set the skin at pre login anyway, so no need for this listener
                 if (!PaperLib.isPaper() && getConfig().getBoolean("forwardSkin")) {

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/ManualNameChange.java

@@ -0,0 +1,65 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015-2021 <Your name and contributors>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.games647.fastlogin.bukkit.listener.protocollib;
+
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.wrappers.WrappedGameProfile;
+import com.github.games647.fastlogin.bukkit.FastLoginBukkit;
+
+import org.geysermc.floodgate.api.FloodgateApi;
+
+import static com.comphenix.protocol.PacketType.Login.Client.START;
+
+/**
+ * Manually inject Floodgate player name prefixes.
+ * <br>
+ * This is used as a workaround, because Floodgate fails to inject
+ * the prefixes when it's used together with ProtocolLib and FastLogin.
+ * <br>
+ * For more information visit: https://github.com/games647/FastLogin/issues/493
+ */
+public class ManualNameChange extends PacketAdapter {
+
+    public ManualNameChange(FastLoginBukkit plugin) {
+        super(params()
+                .plugin(plugin)
+                .types(START));
+
+        this.plugin = plugin;
+    }
+
+    @Override
+    public void onPacketReceiving(PacketEvent packetEvent) {
+        PacketContainer packet = packetEvent.getPacket();
+        WrappedGameProfile originalProfile = packet.getGameProfiles().read(0);
+        packet.setMeta("original_name", originalProfile.getName());
+        String prefixedName = FloodgateApi.getInstance().getPlayerPrefix() + originalProfile.getName();
+        WrappedGameProfile updatedProfile = originalProfile.withName(prefixedName);
+        packet.getGameProfiles().write(0, updatedProfile);
+    }
+}

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/protocollib/ProtocolLibListener.java

@@ -124,6 +124,12 @@ private void onLogin(PacketEvent packetEvent, Player player) {
         PacketContainer packet = packetEvent.getPacket();
 
         String username = packet.getGameProfiles().read(0).getName();
+
+        if (packetEvent.getPacket().getMeta("original_name").isPresent()) {
+            //username has been injected by ManualNameChange.java
+            username = (String) packetEvent.getPacket().getMeta("original_name").get();
+        }
+
         plugin.getLog().trace("GameProfile {} with {} connecting", sessionKey, username);
 
         packetEvent.getAsyncMarker().incrementProcessingDelay();