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Paper/patches/server/0908-Bandaid-fix-for-Effect.patch
Owen 89d51d5f29
Allow enabling sand duping (#10191) 
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable.
2024-03-03 17:05:34 -05:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 28 Jul 2023 15:02:44 -0700
Subject: [PATCH] Bandaid fix for Effect
Effect or LevelEvent needs to be replaced
but ideally after the enum PR has been merged
upstream. Until then, this test and these fixes
should address all the known issues with them
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftEffect.java b/src/main/java/org/bukkit/craftbukkit/CraftEffect.java
index a4519762175c68256b1f303daca8b9408ac182bb..457e9093adb99d31ffc7f061d8c858f98c5d0572 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftEffect.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftEffect.java
@@ -16,12 +16,16 @@ public class CraftEffect {
public static <T> int getDataValue(Effect effect, T data) {
int datavalue;
switch (effect) {
+ case PARTICLES_SCULK_CHARGE: // Paper - add missing effects
+ case TRIAL_SPAWNER_DETECT_PLAYER: // Paper - add missing effects
case VILLAGER_PLANT_GROW:
datavalue = (Integer) data;
break;
case POTION_BREAK:
+ if (data instanceof Potion) { // Paper - use Color for POTION_BREAK
datavalue = ((Potion) data).toDamageValue() & 0x3F;
break;
+ } // Paper - Color will fall through to cast below
case INSTANT_POTION_BREAK:
datavalue = ((Color) data).asRGB();
break;
@@ -29,6 +33,13 @@ public class CraftEffect {
Preconditions.checkArgument(data == Material.AIR || ((Material) data).isRecord(), "Invalid record type for Material %s!", data);
datavalue = Item.getId(CraftItemType.bukkitToMinecraft((Material) data));
break;
+ // Paper start - handle shoot white smoke event
+ case SHOOT_WHITE_SMOKE:
+ final BlockFace face = (BlockFace) data;
+ Preconditions.checkArgument(face.isCartesian(), face + " isn't cartesian");
+ datavalue = org.bukkit.craftbukkit.block.CraftBlock.blockFaceToNotch(face).get3DDataValue();
+ break;
+ // Paper end - handle shoot white smoke event
case SMOKE:
switch ((BlockFace) data) {
case DOWN:
@@ -60,8 +71,15 @@ public class CraftEffect {
}
break;
case STEP_SOUND:
+ if (data instanceof Material) { // Paper - support BlockData
Preconditions.checkArgument(((Material) data).isBlock(), "Material %s is not a block!", data);
datavalue = Block.getId(CraftBlockType.bukkitToMinecraft((Material) data).defaultBlockState());
+ // Paper start - support BlockData
+ break;
+ }
+ case PARTICLES_AND_SOUND_BRUSH_BLOCK_COMPLETE:
+ datavalue = Block.getId(((org.bukkit.craftbukkit.block.data.CraftBlockData) data).getState());
+ // Paper end
break;
case COMPOSTER_FILL_ATTEMPT:
datavalue = ((Boolean) data) ? 1 : 0;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 54cdb4b6a97250c1e15e2fce355e3699c9189948..457d5cdb510a11a069ac7f54a8ed95a74527bff3 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1371,7 +1371,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
public <T> void playEffect(Location loc, Effect effect, T data, int radius) {
if (data != null) {
Preconditions.checkArgument(effect.getData() != null, "Effect.%s does not have a valid Data", effect);
- Preconditions.checkArgument(effect.getData().isAssignableFrom(data.getClass()), "%s data cannot be used for the %s effect", data.getClass().getName(), effect);
+ Preconditions.checkArgument(effect.isApplicable(data), "%s data cannot be used for the %s effect", data.getClass().getName(), effect); // Paper
} else {
// Special case: the axis is optional for ELECTRIC_SPARK
Preconditions.checkArgument(effect.getData() == null || effect == Effect.ELECTRIC_SPARK, "Wrong kind of data for the %s effect", effect);
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 748f49fd3fd4a3c1ed287d1eeed23ce5efecb8d4..15817a84ad5db54ec299f933387f4ad1e0e74b33 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -837,7 +837,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
Preconditions.checkArgument(effect != null, "Effect cannot be null");
if (data != null) {
Preconditions.checkArgument(effect.getData() != null, "Effect.%s does not have a valid Data", effect);
- Preconditions.checkArgument(effect.getData().isAssignableFrom(data.getClass()), "%s data cannot be used for the %s effect", data.getClass().getName(), effect);
+ Preconditions.checkArgument(effect.isApplicable(data), "%s data cannot be used for the %s effect", data.getClass().getName(), effect); // Paper
} else {
// Special case: the axis is optional for ELECTRIC_SPARK
Preconditions.checkArgument(effect.getData() == null || effect == Effect.ELECTRIC_SPARK, "Wrong kind of data for the %s effect", effect);
diff --git a/src/test/java/org/bukkit/EffectTest.java b/src/test/java/org/bukkit/EffectTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..875eacc2e5776901ba8593d0183844db2571f71b
--- /dev/null
+++ b/src/test/java/org/bukkit/EffectTest.java
@@ -0,0 +1,64 @@
+package org.bukkit;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import net.minecraft.world.level.block.LevelEvent;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EffectTest {
+
+ private static List<Integer> collectNmsLevelEvents() throws ReflectiveOperationException {
+ final List<Integer> events = new ArrayList<>();
+ for (final Field field : LevelEvent.class.getFields()) {
+ if (Modifier.isStatic(field.getModifiers()) && Modifier.isFinal(field.getModifiers()) && field.getType() == int.class) {
+ events.add((int) field.get(null));
+ }
+ }
+ return events;
+ }
+
+ private static boolean isNotDeprecated(Effect effect) throws ReflectiveOperationException {
+ return !Effect.class.getDeclaredField(effect.name()).isAnnotationPresent(Deprecated.class);
+ }
+
+ @SuppressWarnings("deprecation")
+ @Test
+ public void checkAllApiExists() throws ReflectiveOperationException {
+ Map<Integer, Effect> toId = new HashMap<>();
+ for (final Effect effect : Effect.values()) {
+ if (isNotDeprecated(effect)) {
+ final Effect put = toId.put(effect.getId(), effect);
+ assertNull(put, "duplicate API effect: " + put);
+ }
+ }
+
+ for (final Integer event : collectNmsLevelEvents()) {
+ assertNotNull(toId.get(event), "missing API Effect: " + event);
+ }
+ }
+
+ @SuppressWarnings("deprecation")
+ @Test
+ public void checkNoExtraApi() throws ReflectiveOperationException {
+ Map<Integer, Effect> toId = new HashMap<>();
+ for (final Effect effect : Effect.values()) {
+ if (isNotDeprecated(effect)) {
+ final Effect put = toId.put(effect.getId(), effect);
+ assertNull(put, "duplicate API effect: " + put);
+ }
+ }
+
+ final List<Integer> nmsEvents = collectNmsLevelEvents();
+ for (final Map.Entry<Integer, Effect> entry : toId.entrySet()) {
+ assertTrue(nmsEvents.contains(entry.getKey()), "Extra API Effect: " + entry.getValue());
+ }
+ }
+}
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