Add MultiPlace

src/main/java/ac/grim/grimac/checks/impl/scaffolding/MultiPlace.java

@@ -0,0 +1,75 @@
+package ac.grim.grimac.checks.impl.scaffolding;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.BlockPlaceCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.BlockPlace;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.world.BlockFace;
+import com.github.retrooper.packetevents.util.Vector3f;
+import com.github.retrooper.packetevents.util.Vector3i;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static ac.grim.grimac.utils.anticheat.MessageUtil.toUnlabledString;
+
+@CheckData(name = "MultiPlace", experimental = true)
+public class MultiPlace extends BlockPlaceCheck {
+    public MultiPlace(GrimPlayer player) {
+        super(player);
+    }
+
+    private final List<String> flags = new ArrayList<>();
+
+    private boolean hasPlaced;
+    private BlockFace lastFace;
+    private Vector3f lastCursor;
+    private Vector3i lastPos;
+
+    @Override
+    public void onBlockPlace(final BlockPlace place) {
+        final BlockFace face = place.getDirection();
+        final Vector3f cursor = place.getCursor();
+        final Vector3i pos = place.getPlacedAgainstBlockLocation();
+
+        if (hasPlaced && (face != lastFace || !cursor.equals(lastCursor) || !pos.equals(lastPos))) {
+            final String verbose = "face=" + face + ", lastFace=" + lastFace
+                    + ", cursor=" + toUnlabledString(cursor) + ", lastCursor=" + toUnlabledString(lastCursor)
+                    + ", pos=" + toUnlabledString(pos) + ", lastPos=" + toUnlabledString(lastPos);
+            if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                if (flagAndAlert(verbose) && shouldModifyPackets() && shouldCancel()) {
+                    place.resync();
+                }
+            } else {
+                flags.add(verbose);
+            }
+        }
+
+        lastFace = face;
+        lastCursor = cursor;
+        lastPos = pos;
+        hasPlaced = true;
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType())) {
+            hasPlaced = false;
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        if (player.getClientVersion().isNewerThan(ClientVersion.V_1_8) && !player.skippedTickInActualMovement) {
+            for (String verbose : flags) {
+                flagAndAlert(verbose);
+            }
+        }
+
+        flags.clear();
+    }
+}

src/main/java/ac/grim/grimac/checks/type/BlockPlaceCheck.java

@@ -14,7 +14,7 @@
 import java.util.ArrayList;
 import java.util.List;
 
-public class BlockPlaceCheck extends Check implements RotationCheck {
+public class BlockPlaceCheck extends Check implements RotationCheck, PostPredictionCheck {
     private static final List<StateType> weirdBoxes = new ArrayList<>();
     private static final List<StateType> buggyBoxes = new ArrayList<>();
 

src/main/java/ac/grim/grimac/manager/CheckManager.java

@@ -139,6 +139,7 @@ public CheckManager(GrimPlayer player) {
                 .put(InvalidPlaceA.class, new InvalidPlaceA(player))
                 .put(InvalidPlaceB.class, new InvalidPlaceB(player))
                 .put(AirLiquidPlace.class, new AirLiquidPlace(player))
+                .put(MultiPlace.class, new MultiPlace(player))
                 .put(FarPlace.class, new FarPlace(player))
                 .put(FabricatedPlace.class, new FabricatedPlace(player))
                 .put(PositionPlace.class, new PositionPlace(player))
@@ -201,6 +202,9 @@ public void onPacketReceive(final PacketReceiveEvent packet) {
         for (PostPredictionCheck check : postPredictionCheck.values()) {
             check.onPacketReceive(packet);
         }
+        for (BlockPlaceCheck check : blockPlaceCheck.values()) {
+            check.onPacketReceive(packet);
+        }
     }
 
     public void onPacketSend(final PacketSendEvent packet) {
@@ -213,6 +217,9 @@ public void onPacketSend(final PacketSendEvent packet) {
         for (PostPredictionCheck check : postPredictionCheck.values()) {
             check.onPacketSend(packet);
         }
+        for (BlockPlaceCheck check : blockPlaceCheck.values()) {
+            check.onPacketSend(packet);
+        }
     }
 
     public void onPositionUpdate(final PositionUpdate position) {
@@ -240,6 +247,9 @@ public void onPredictionFinish(final PredictionComplete complete) {
         for (PostPredictionCheck check : postPredictionCheck.values()) {
             check.onPredictionComplete(complete);
         }
+        for (BlockPlaceCheck check : blockPlaceCheck.values()) {
+            check.onPredictionComplete(complete);
+        }
     }
 
     public void onBlockPlace(final BlockPlace place) {

src/main/java/ac/grim/grimac/utils/anticheat/MessageUtil.java

@@ -3,6 +3,8 @@
 import ac.grim.grimac.GrimAPI;
 import com.github.retrooper.packetevents.PacketEvents;
 import com.github.retrooper.packetevents.manager.server.ServerVersion;
+import com.github.retrooper.packetevents.util.Vector3f;
+import com.github.retrooper.packetevents.util.Vector3i;
 import lombok.experimental.UtilityClass;
 import net.md_5.bungee.api.ChatColor;
 
@@ -11,6 +13,13 @@
 
 @UtilityClass
 public class MessageUtil {
+    public String toUnlabledString(Vector3i vec) {
+        return vec == null ? "null" : vec.x + ", " + vec.y + ", " + vec.z;
+    }
+
+    public String toUnlabledString(Vector3f vec) {
+        return vec == null ? "null" : vec.x + ", " + vec.y + ", " + vec.z;
+    }
 
     public String format(String string) {
         string = formatWithNoColor(string);