papermc/Spigot-Server-Patches/0006-Vanished-players-don-t-have-rights.patch

From e5ce005823f066b5c88dfc06184f878f7d301501 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Mon, 29 Feb 2016 21:20:21 -0600
Subject: [PATCH] Vanished players don't have rights


diff --git a/src/main/java/net/minecraft/server/EntityArrow.java b/src/main/java/net/minecraft/server/EntityArrow.java
index 8d52140..ccbf47e 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -189,6 +189,14 @@ public abstract class EntityArrow extends Entity implements IProjectile {
                 }
             }
 
+            // Paper start - Allow arrows to fly through vanished players the shooter can't see
+            if (movingobjectposition != null && movingobjectposition.entity instanceof EntityPlayer && shooter != null && shooter instanceof EntityPlayer) {
+                if (!((EntityPlayer) shooter).getBukkitEntity().canSee(((EntityPlayer) movingobjectposition.entity).getBukkitEntity())) {
+                    movingobjectposition = null;
+                }
+            }
+            // Paper end
+
             if (movingobjectposition != null) {
                 this.a(movingobjectposition);
             }
diff --git a/src/main/java/net/minecraft/server/EntityFishingHook.java b/src/main/java/net/minecraft/server/EntityFishingHook.java
index 5a62881..da4eaf1 100644
--- a/src/main/java/net/minecraft/server/EntityFishingHook.java
+++ b/src/main/java/net/minecraft/server/EntityFishingHook.java
@@ -198,6 +198,14 @@ public class EntityFishingHook extends Entity {
                     movingobjectposition = new MovingObjectPosition(entity);
                 }
 
+                // Paper start - Allow fishing hooks to fly through vanished players the shooter can't see
+                if (movingobjectposition != null && movingobjectposition.entity instanceof EntityPlayer && owner != null && owner instanceof EntityPlayer) {
+                    if (!((EntityPlayer) owner).getBukkitEntity().canSee(((EntityPlayer) movingobjectposition.entity).getBukkitEntity())) {
+                        movingobjectposition = null;
+                    }
+                }
+                // Paper end
+
                 if (movingobjectposition != null) {
                     org.bukkit.craftbukkit.event.CraftEventFactory.callProjectileHitEvent(this); // Craftbukkit - Call event
                     if (movingobjectposition.entity != null) {
diff --git a/src/main/java/net/minecraft/server/EntityProjectile.java b/src/main/java/net/minecraft/server/EntityProjectile.java
index 07dc5cc..770f130 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -160,6 +160,14 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
             movingobjectposition = new MovingObjectPosition(entity);
         }
 
+        // Paper start - Allow projectiles to fly through vanished players the shooter can't see
+        if (movingobjectposition != null && movingobjectposition.entity instanceof EntityPlayer && shooter != null && shooter instanceof EntityPlayer) {
+            if (!((EntityPlayer) shooter).getBukkitEntity().canSee(((EntityPlayer) movingobjectposition.entity).getBukkitEntity())) {
+                movingobjectposition = null;
+            }
+        }
+        // Paper end
+
         if (movingobjectposition != null) {
             if (movingobjectposition.type == MovingObjectPosition.EnumMovingObjectType.BLOCK && this.world.getType(movingobjectposition.a()).getBlock() == Blocks.PORTAL) {
                 this.e(movingobjectposition.a());
diff --git a/src/main/java/net/minecraft/server/ItemBlock.java b/src/main/java/net/minecraft/server/ItemBlock.java
index 3b6feb7..1450483 100644
--- a/src/main/java/net/minecraft/server/ItemBlock.java
+++ b/src/main/java/net/minecraft/server/ItemBlock.java
@@ -23,7 +23,7 @@ public class ItemBlock extends Item {
             blockposition = blockposition.shift(enumdirection);
         }
 
-        if (itemstack.count != 0 && entityhuman.a(blockposition, enumdirection, itemstack) && world.a(this.a, blockposition, false, enumdirection, (Entity) null, itemstack)) {
+        if (itemstack.count != 0 && entityhuman.a(blockposition, enumdirection, itemstack) && world.a(this.a, blockposition, false, enumdirection, entityhuman, itemstack)) { // Paper - Pass entityhuman instead of null
             int i = this.filterData(itemstack.getData());
             IBlockData iblockdata1 = this.a.getPlacedState(world, blockposition, enumdirection, f, f1, f2, i, entityhuman);
 
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index b73f64e..932e826 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1702,6 +1702,14 @@ public abstract class World implements IBlockAccess {
         for (int i = 0; i < list.size(); ++i) {
             Entity entity1 = (Entity) list.get(i);
 
+            // Paper start - Allow block placement if the placer cannot see the vanished blocker
+            if (entity instanceof EntityPlayer && entity1 instanceof EntityPlayer) {
+                if (!((EntityPlayer) entity).getBukkitEntity().canSee(((EntityPlayer) entity1).getBukkitEntity())) {
+                    continue;
+                }
+            }
+            // Paper end
+
             if (!entity1.dead && entity1.i && entity1 != entity && (entity == null || entity1.x(entity))) {
                 return false;
             }
-- 
2.9.0