[Forge] Add hook into a random Vanish mod for checking vanish status

Author: NEZNAMY

forge/src/main/java/me/neznamy/tab/platforms/forge/ForgeTabPlayer.java

@@ -1,6 +1,7 @@
 package me.neznamy.tab.platforms.forge;
 
 import me.neznamy.tab.platforms.forge.hook.LuckPermsAPIHook;
+import me.neznamy.tab.platforms.forge.hook.VanishHook;
 import me.neznamy.tab.shared.backend.BackendTabPlayer;
 import me.neznamy.tab.shared.chat.component.TabComponent;
 import net.minecraft.SharedConstants;
@@ -64,6 +65,9 @@ public ForgePlatform getPlatform() {
 
     @Override
     public boolean isVanished0() {
+        if (VanishHook.isInstalled()) {
+            return VanishHook.isVanished(getPlayer());
+        }
         return false;
     }
 

forge/src/main/java/me/neznamy/tab/platforms/forge/hook/VanishHook.java

@@ -0,0 +1,52 @@
+package me.neznamy.tab.platforms.forge.hook;
+
+import lombok.SneakyThrows;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.entity.player.Player;
+import net.minecraftforge.fml.ModList;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Method;
+
+/**
+ * Vanish hook for Forge.
+ */
+public class VanishHook {
+
+    /** Method for getting vanish status for a player. */
+    @Nullable
+    private static Method isVanished;
+
+    static {
+        try {
+            if (ModList.get().isLoaded("vmod")) {
+                isVanished = Class.forName("redstonedubstep.mods.vanishmod.VanishUtil").getMethod("isVanished", Player.class);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Checks if Vanish mod is installed.
+     *
+     * @return  {@code true} if installed, {@code false} if not
+     */
+    public static boolean isInstalled() {
+        return isVanished != null;
+    }
+
+    /**
+     * Check if the player is vanished.
+     *
+     * @param   player
+     *          Player to check
+     * @return  {@code true} if vanished, {@code false} if not
+     */
+    @SneakyThrows
+    public static boolean isVanished(@NotNull ServerPlayer player) {
+        if (isVanished == null) return false;
+        return (boolean) isVanished.invoke(null, player);
+    }
+}