From 85b439d4648ae4766f5c54754219b5fd0ea315ac Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Sat, 7 Mar 2015 19:50:01 -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 46f6374..6aa8cad 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -220,6 +220,14 @@ public class EntityArrow extends Entity implements IProjectile {
             float f2;
             float f3;
 
+            // PaperSpigot 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;
+                }
+            }
+            // PaperSpigot 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 d4e5971..fbcb6ac 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -147,6 +147,14 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
             }
         }
 
+        // PaperSpigot 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;
+            }
+        }
+        // PaperSpigot end
+
         if (movingobjectposition != null) {
             if (movingobjectposition.type == MovingObjectPosition.EnumMovingObjectType.BLOCK && this.world.getType(movingobjectposition.a()).getBlock() == Blocks.PORTAL) {
                 this.d(movingobjectposition.a());
diff --git a/src/main/java/net/minecraft/server/ItemBlock.java b/src/main/java/net/minecraft/server/ItemBlock.java
index 451a0bb..24601c7 100644
--- a/src/main/java/net/minecraft/server/ItemBlock.java
+++ b/src/main/java/net/minecraft/server/ItemBlock.java
@@ -25,7 +25,7 @@ public class ItemBlock extends Item {
             return false;
         } else if (!entityhuman.a(blockposition, enumdirection, itemstack)) {
             return false;
-        } else if (world.a(this.a, blockposition, false, enumdirection, (Entity) null, itemstack)) {
+        } else if (world.a(this.a, blockposition, false, enumdirection, entityhuman, itemstack)) { // PaperSpigot - 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 31df781..4838e84 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1671,6 +1671,13 @@ public abstract class World implements IBlockAccess {
         for (int i = 0; i < list.size(); ++i) {
             Entity entity1 = (Entity) list.get(i);
 
+            // PaperSpigot 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;
+                }
+            }
+
             if (!entity1.dead && entity1.k && entity1 != entity && (entity == null || entity.vehicle != entity1 && entity.passenger != entity1)) {
                 return false;
             }
-- 
1.9.1