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64 changes: 64 additions & 0 deletions
64
src/main/java/me/drex/vanish/mixin/ServerCommonPacketListenerImplMixin.java
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package me.drex.vanish.mixin; | ||
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import it.unimi.dsi.fastutil.objects.ObjectArrayList; | ||
import me.drex.vanish.api.VanishAPI; | ||
import net.minecraft.network.PacketSendListener; | ||
import net.minecraft.network.protocol.Packet; | ||
import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket; | ||
import net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket; | ||
import net.minecraft.network.protocol.game.ClientboundTakeItemEntityPacket; | ||
import net.minecraft.server.MinecraftServer; | ||
import net.minecraft.server.level.ServerPlayer; | ||
import net.minecraft.server.network.ServerCommonPacketListenerImpl; | ||
import net.minecraft.server.network.ServerGamePacketListenerImpl; | ||
import net.minecraft.world.entity.Entity; | ||
import org.jetbrains.annotations.Nullable; | ||
import org.spongepowered.asm.mixin.Final; | ||
import org.spongepowered.asm.mixin.Mixin; | ||
import org.spongepowered.asm.mixin.Shadow; | ||
import org.spongepowered.asm.mixin.injection.At; | ||
import org.spongepowered.asm.mixin.injection.Inject; | ||
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo; | ||
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@Mixin(ServerCommonPacketListenerImpl.class) | ||
public abstract class ServerCommonPacketListenerImplMixin { | ||
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@Shadow @Final protected MinecraftServer server; | ||
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@Shadow public abstract void send(Packet<?> packet); | ||
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@Inject( | ||
method = "send(Lnet/minecraft/network/protocol/Packet;Lnet/minecraft/network/PacketSendListener;Z)V", | ||
at = @At("HEAD"), | ||
cancellable = true | ||
) | ||
public void vanish_modifyPackets(Packet<?> packet, @Nullable PacketSendListener packetSendListener, boolean flush, CallbackInfo ci) { | ||
if ((Object) this instanceof ServerGamePacketListenerImpl listener) { | ||
if (packet instanceof ClientboundTakeItemEntityPacket takeItemEntityPacket) { | ||
Entity entity = listener.player.level().getEntity(takeItemEntityPacket.getPlayerId()); | ||
if (entity instanceof ServerPlayer actor && !VanishAPI.canSeePlayer(actor, listener.player)) { | ||
this.send(new ClientboundRemoveEntitiesPacket(takeItemEntityPacket.getItemId())); | ||
ci.cancel(); | ||
} | ||
} else if (packet instanceof ClientboundPlayerInfoUpdatePacket playerInfoPacket) { | ||
ObjectArrayList<ServerPlayer> modifiedEntries = new ObjectArrayList<>(); | ||
int visible = 0; | ||
for (ClientboundPlayerInfoUpdatePacket.Entry playerUpdate : playerInfoPacket.entries()) { | ||
if (VanishAPI.canSeePlayer(server, playerUpdate.profileId(), listener.player)) { | ||
visible++; | ||
ServerPlayer player = server.getPlayerList().getPlayer(playerUpdate.profileId()); | ||
if (player != null) modifiedEntries.add(player); | ||
} | ||
} | ||
if (visible != playerInfoPacket.entries().size()) { | ||
if (!modifiedEntries.isEmpty()) { | ||
this.send(new ClientboundPlayerInfoUpdatePacket(playerInfoPacket.actions(), modifiedEntries)); | ||
} | ||
ci.cancel(); | ||
} | ||
} | ||
} | ||
} | ||
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} |
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