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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| <?xml version="1.0" encoding="UTF-8"?> | ||
| <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
| <modelVersion>4.0.0</modelVersion> | ||
| <parent> | ||
| <groupId>dev.cerus.maps</groupId> | ||
| <artifactId>parent</artifactId> | ||
| <version>3.8.1</version> | ||
| </parent> | ||
|
|
||
| <artifactId>bukkit-20_R2</artifactId> | ||
|
|
||
| <properties> | ||
| <maven.compiler.source>16</maven.compiler.source> | ||
| <maven.compiler.target>16</maven.compiler.target> | ||
| <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | ||
| </properties> | ||
|
|
||
| <dependencies> | ||
| <dependency> | ||
| <groupId>dev.cerus.maps</groupId> | ||
| <artifactId>common</artifactId> | ||
| <version>${parent.version}</version> | ||
| <scope>provided</scope> | ||
| </dependency> | ||
| <dependency> | ||
| <groupId>org.bukkit</groupId> | ||
| <artifactId>craftbukkit</artifactId> | ||
| <version>1.20.2-R0.1-SNAPSHOT</version> | ||
| <scope>provided</scope> | ||
| </dependency> | ||
| </dependencies> | ||
|
|
||
| </project> |
112 changes: 112 additions & 0 deletions
112
bukkit-20_R2/src/main/java/dev/cerus/maps/version/PacketHandler20R2.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package dev.cerus.maps.version; | ||
|
|
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| import dev.cerus.maps.api.version.PacketListener; | ||
| import io.netty.channel.ChannelDuplexHandler; | ||
| import io.netty.channel.ChannelHandlerContext; | ||
| import java.lang.reflect.Field; | ||
| import java.util.Arrays; | ||
| import net.minecraft.network.protocol.game.ClientboundBlockChangedAckPacket; | ||
| import net.minecraft.network.protocol.game.PacketPlayInBlockDig; | ||
| import net.minecraft.network.protocol.game.PacketPlayInBlockPlace; | ||
| import net.minecraft.network.protocol.game.PacketPlayInUseEntity; | ||
| import net.minecraft.network.protocol.game.PacketPlayInUseItem; | ||
| import net.minecraft.world.EnumHand; | ||
| import net.minecraft.world.phys.MovingObjectPositionBlock; | ||
| import org.bukkit.Bukkit; | ||
| import org.bukkit.Location; | ||
| import org.bukkit.craftbukkit.v1_20_R2.block.CraftBlock; | ||
| import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer; | ||
| import org.bukkit.entity.Player; | ||
| import org.bukkit.plugin.java.JavaPlugin; | ||
|
|
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| public class PacketHandler20R2 extends ChannelDuplexHandler { | ||
|
|
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| private static final Field actionField; | ||
| private static final Object attackAction; | ||
|
|
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| static { | ||
| try { | ||
| actionField = PacketPlayInUseEntity.class.getDeclaredField("b"); | ||
| actionField.setAccessible(true); | ||
| final Field attackActionField = PacketPlayInUseEntity.class.getDeclaredField("d"); | ||
| attackActionField.setAccessible(true); | ||
| attackAction = attackActionField.get(null); | ||
| } catch (final NoSuchFieldException | IllegalAccessException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
|
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| private final Player player; | ||
| private final PacketListener listener; | ||
| private final JavaPlugin plugin; | ||
|
|
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| public PacketHandler20R2(final Player player, final PacketListener listener, final JavaPlugin plugin) { | ||
| this.player = player; | ||
| this.listener = listener; | ||
| this.plugin = plugin; | ||
| } | ||
|
|
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| private static Object getAction(final PacketPlayInUseEntity packet) { | ||
| try { | ||
| return actionField.get(packet); | ||
| } catch (final IllegalAccessException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
|
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| private static EnumHand getHand(final PacketPlayInUseEntity packet) { | ||
| try { | ||
| final Object action = getAction(packet); | ||
| final Field handField = Arrays.stream(action.getClass().getDeclaredFields()) | ||
| .filter(field -> field.getType() == EnumHand.class) | ||
| .findAny().orElse(null); | ||
| if (handField == null) { | ||
| return null; | ||
| } | ||
| handField.setAccessible(true); | ||
| return (EnumHand) handField.get(action); | ||
| } catch (final IllegalAccessException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception { | ||
| if ((((msg instanceof final PacketPlayInUseItem useItem && useItem.a() != EnumHand.b) || msg instanceof PacketPlayInBlockPlace) | ||
| && this.listener.handlePlayerRightClick(this.player)) || (msg instanceof final PacketPlayInUseEntity useEntity && getHand(useEntity) != EnumHand.b | ||
| && (getAction(useEntity) == attackAction ? this.listener.handlePlayerLeftClick(this.player) | ||
| : this.listener.handlePlayerRightClick(this.player))) || (msg instanceof PacketPlayInBlockDig | ||
| && this.listener.handlePlayerLeftClick(this.player))) { | ||
| if (msg instanceof final PacketPlayInBlockDig dig) { | ||
| // To prevent de-syncs we need to tell the client that the block has not changed | ||
| final Location location = new Location( | ||
| this.player.getWorld(), | ||
| dig.a().u(), | ||
| dig.a().v(), | ||
| dig.a().w() | ||
| ); | ||
| // If we don't acknowledge the client's block change it won't accept further block change packets | ||
| ((CraftPlayer) this.player).getHandle().c.a(new ClientboundBlockChangedAckPacket(dig.f())); | ||
| Bukkit.getScheduler().runTask(this.plugin, () -> this.player.sendBlockChange(location, location.getBlock().getBlockData())); | ||
| } | ||
| if (msg instanceof final PacketPlayInUseItem useItem) { | ||
| // To prevent de-syncs we need to tell the client that the block has not changed | ||
| final MovingObjectPositionBlock pos = useItem.d(); | ||
| if (pos != null && pos.a() != null) { | ||
| final Location location = new Location( | ||
| this.player.getWorld(), | ||
| pos.a().u(), | ||
| pos.a().v(), | ||
| pos.a().w() | ||
| ).getBlock().getRelative(CraftBlock.notchToBlockFace(pos.b())).getLocation(); | ||
| // If we don't acknowledge the client's block change it won't accept further block change packets | ||
| ((CraftPlayer) this.player).getHandle().c.a(new ClientboundBlockChangedAckPacket(useItem.e())); | ||
| Bukkit.getScheduler().runTask(this.plugin, () -> this.player.sendBlockChange(location, location.getBlock().getBlockData())); | ||
| } | ||
| } | ||
| return; | ||
| } | ||
| super.channelRead(ctx, msg); | ||
| } | ||
|
|
||
| } |
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