feat: Experimental support for modern TabCompletion blocking

api/velocity/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 dependencies {
-    compileOnly(libs.velocity)
+    compileOnly(libs.velocity.api)
 }
 
 tasks {

gradle/libs.versions.toml

@@ -17,6 +17,7 @@ blossom = "1.3.1"
 geantyref = "1.3.13"
 indra = "3.1.1"
 runtask = "2.1.0"
+vpacketevents = "1.1.0"
 
 # Test versions
 assertj = "3.24.2"
@@ -26,7 +27,8 @@ assertj = "3.24.2"
 adventure = { group = "net.kyori", name = "adventure-api", version.ref = "adventure" }
 
 paper = { group = "io.papermc.paper", name = "paper-api", version.ref = "paper" }
-velocity = { group = "com.velocitypowered", name = "velocity-api", version.ref = "velocity" }
+velocity-api = { group = "com.velocitypowered", name = "velocity-api", version.ref = "velocity" }
+velocity-proxy = { group = "com.velocitypowered", name = "velocity-proxy", version.ref = "velocity" }
 authme = { module = "fr.xephi:authme", version.ref = "authme" }
 
 libby-core = { group = "net.byteflux", name = "libby-core", version.ref = "libby" }
@@ -35,6 +37,7 @@ libby-paper = { group = "net.byteflux", name = "libby-paper", version.ref = "lib
 libby-velocity = { group = "net.byteflux", name = "libby-velocity", version.ref = "libby" }
 
 miniplaceholders = { group = "io.github.miniplaceholders", name = "miniplaceholders-api", version.ref = "miniplaceholders" }
+vpacketevents = { group = "io.github.4drian3d", name = "vpacketevents-api", version.ref = "vpacketevents" }
 
 fastlogin-velocity = { group = "com.github.games647", name = "fastlogin.velocity", version.ref = "fastlogin" }
 bstats-velocity = { group = "org.bstats", name = "bstats-velocity", version.ref = "bstats" }

velocity/build.gradle.kts

@@ -15,14 +15,17 @@ repositories {
             includeGroup("net.byteflux")
         }
     }
+    maven("https://maven.elytrium.net/repo/")
 }
 
 dependencies {
-    compileOnly(libs.velocity)
-    annotationProcessor(libs.velocity)
+    compileOnly(libs.velocity.api)
+    compileOnly(libs.velocity.proxy)
+    annotationProcessor(libs.velocity.api)
 
     compileOnly(libs.miniplaceholders)
     compileOnly(libs.fastlogin.velocity)
+    compileOnly(libs.vpacketevents)
 
     implementation(projects.authmevelocityCommon)
     implementation(projects.authmevelocityApiVelocity)

velocity/src/main/java/io/github/_4drian3d/authmevelocity/velocity/AuthMeVelocityPlugin.java

@@ -48,6 +48,7 @@ import io.github._4drian3d.authmevelocity.velocity.listener.connection.PreConnec
 import io.github._4drian3d.authmevelocity.velocity.listener.data.PluginMessageListener;
 import io.github._4drian3d.authmevelocity.velocity.listener.input.ChatListener;
 import io.github._4drian3d.authmevelocity.velocity.listener.input.CommandListener;
+import io.github._4drian3d.authmevelocity.velocity.listener.input.CompletionPacketListener;
 import io.github._4drian3d.authmevelocity.velocity.listener.input.TabCompleteListener;
 import net.byteflux.libby.VelocityLibraryManager;
 import net.kyori.adventure.text.minimessage.MiniMessage;
@@ -78,6 +79,10 @@ import java.util.stream.Stream;
         @Dependency(
             id = "fastlogin",
             optional = true
+        ),
+        @Dependency(
+            id = "vpacketevents",
+            optional = true
         )
     }
 )
@@ -151,6 +156,11 @@ public final class AuthMeVelocityPlugin implements AuthMeVelocityAPI {
             injector.getInstance(AuthMePlaceholders.class).getExpansion().register();
         }
 
+        final boolean vpacketevents = pluginManager.isLoaded("vpacketevents");
+        if (vpacketevents) {
+            injector.getInstance(CompletionPacketListener.class).register();
+        }
+
         injector.getInstance(AuthMeCommand.class).register();
 
         this.sendInfoMessage();

velocity/src/main/java/io/github/_4drian3d/authmevelocity/velocity/listener/input/CompletionPacketListener.java

@@ -0,0 +1,42 @@
+package io.github._4drian3d.authmevelocity.velocity.listener.input;
+
+import com.google.inject.Inject;
+import com.velocitypowered.api.event.EventManager;
+import com.velocitypowered.api.event.EventTask;
+import com.velocitypowered.api.network.ProtocolVersion;
+import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.proxy.protocol.packet.TabCompleteResponse;
+import io.github._4drian3d.authmevelocity.velocity.AuthMeVelocityPlugin;
+import io.github._4drian3d.authmevelocity.velocity.listener.Listener;
+import io.github._4drian3d.vpacketevents.api.event.PacketSendEvent;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class CompletionPacketListener implements Listener<PacketSendEvent> {
+    @Inject
+    private EventManager eventManager;
+    @Inject
+    private AuthMeVelocityPlugin plugin;
+
+    @Override
+    public void register() {
+        eventManager.register(plugin, PacketSendEvent.class, this);
+    }
+
+    @Override
+    public @Nullable EventTask executeAsync(final PacketSendEvent event) {
+        if (!(event.getPacket() instanceof final TabCompleteResponse responsePacket)) {
+            return null;
+        }
+        final Player player = event.getPlayer();
+        if (player.getProtocolVersion().compareTo(ProtocolVersion.MINECRAFT_1_13) < 0) {
+            return null;
+        }
+        return EventTask.async(() -> {
+            if (plugin.isLogged(player)) {
+                plugin.logDebug("PacketSendEvent | TabCompleteResponse | Player is already logged");
+                return;
+            }
+            responsePacket.getOffers().clear();
+        });
+    }
+}