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Paper/patches/server/0615-prevent-unintended-light-block-manipulation.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Mon, 13 Sep 2021 18:55:45 -0700
Subject: [PATCH] prevent unintended light block manipulation
diff --git a/src/main/java/net/minecraft/world/level/block/LightBlock.java b/src/main/java/net/minecraft/world/level/block/LightBlock.java
index 6c3ca57a29d3c5ad1add1cf2f707b930dfc422ea..fec6bf38f080039436ba80d5528857ba4787bf4e 100644
--- a/src/main/java/net/minecraft/world/level/block/LightBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/LightBlock.java
@@ -50,6 +50,14 @@ public class LightBlock extends Block implements SimpleWaterloggedBlock {
builder.add(LEVEL, WATERLOGGED);
}
+ // Paper start - prevent unintended light block manipulation
+ @Override
+ protected InteractionResult useItemOn(ItemStack stack, BlockState state, Level world, BlockPos pos, Player player, net.minecraft.world.InteractionHand hand, BlockHitResult hit) {
+ if (player.getItemInHand(hand).getItem() != Items.LIGHT || (world instanceof final net.minecraft.server.level.ServerLevel serverLevel && !player.mayInteract(serverLevel, pos)) || !player.mayUseItemAt(pos, hit.getDirection(), player.getItemInHand(hand))) { return net.minecraft.world.InteractionResult.PASS; } // Paper - Prevent unintended light block manipulation
+ return super.useItemOn(stack, state, world, pos, player, hand, hit);
+ }
+ // Paper end - prevent unintended light block manipulation
+
@Override
protected InteractionResult useWithoutItem(BlockState state, Level world, BlockPos pos, Player player, BlockHitResult hit) {
if (!world.isClientSide && player.canUseGameMasterBlocks()) {