Allow ability to replace piston extension block to prevent crashing.

src/main/java/us/myles/ViaVersion/ViaConfig.java

@@ -150,6 +150,16 @@ public class ViaConfig implements ViaVersionConfig {
         return plugin.getConfig().getBoolean("nms-player-ticking", true);
     }
 
+    @Override
+    public boolean isReplacePistons() {
+        return plugin.getConfig().getBoolean("replace-pistons", false);
+    }
+
+    @Override
+    public int getPistonReplacementId() {
+        return plugin.getConfig().getInt("replacement-piston-id", 0);
+    }
+
     public boolean isAutoTeam() {
         // Collision has to be enabled first
         return isPreventCollision() && plugin.getConfig().getBoolean("auto-team", true);

src/main/java/us/myles/ViaVersion/api/ViaVersionConfig.java

@@ -172,4 +172,18 @@ public interface ViaVersionConfig {
      * @return if true, enabled
      */
     boolean isNMSPlayerTicking();
+
+    /**
+     * Replace extended pistons on 1.10 chunk loading.
+     *
+     * @return True if to replace them
+     */
+    boolean isReplacePistons();
+
+    /**
+     * Get the id for replacing extended pistons.
+     *
+     * @return The integer id
+     */
+    int getPistonReplacementId();
 }

src/main/java/us/myles/ViaVersion/api/data/StoredObject.java

@@ -1,10 +1,9 @@
 package us.myles.ViaVersion.api.data;
 
-import lombok.AccessLevel;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 
-@Getter(AccessLevel.PROTECTED)
+@Getter
 @AllArgsConstructor
 public class StoredObject {
     private UserConnection user;

src/main/java/us/myles/ViaVersion/protocols/protocol1_9to1_8/types/ChunkType.java

@@ -3,10 +3,13 @@ package us.myles.ViaVersion.protocols.protocol1_9to1_8.types;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import org.bukkit.Bukkit;
+import us.myles.ViaVersion.api.ViaVersion;
 import us.myles.ViaVersion.api.minecraft.chunks.Chunk;
 import us.myles.ViaVersion.api.type.PartialType;
 import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.api.type.types.minecraft.BaseChunkType;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+import us.myles.ViaVersion.protocols.protocol1_10to1_9_3.Protocol1_10To1_9_3_4;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.chunks.Chunk1_9to1_8;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.chunks.ChunkSection1_9to1_8;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.ClientChunks;
@@ -46,6 +49,9 @@ public class ChunkType extends PartialType<Chunk, ClientChunks> {
 
     @Override
     public Chunk read(ByteBuf input, ClientChunks param) throws Exception {
+        boolean replacePistons = param.getUser().get(ProtocolInfo.class).getPipeline().contains(Protocol1_10To1_9_3_4.class) && ViaVersion.getConfig().isReplacePistons();
+        int replacementId = ViaVersion.getConfig().getPistonReplacementId();
+
         int chunkX = input.readInt();
         int chunkZ = input.readInt();
         long chunkHash = toLong(chunkX, chunkZ);
@@ -93,7 +99,8 @@ public class ChunkType extends PartialType<Chunk, ClientChunks> {
                 int mask = blockBuf.get();
                 int type = mask >> 4;
                 int data = mask & 0xF;
-
+                if (replacePistons && type == 36)
+                    type = replacementId;
                 section.setBlock(j, type, data);
             }
         }

src/main/resources/config.yml

@@ -71,3 +71,7 @@ use-new-deathmessages: false
 item-cache: true
 # Patch the Anti xray to work on 1.9 & 1.10 (If your server is 1.8) This can cost more performance, so disable it if you don't use it.
 anti-xray-patch: true
+# Should we replace extended pistons to fix 1.10.1 (Only on chunk load)
+replace-pistons: false
+# What id should we replace with, default is air. (careful of players getting stuck standing on them)
+replacement-piston-id: 0