From c65b186088762db0436f8b58604355ae8fbfebc5 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Fri, 28 Nov 2014 00:35:56 -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 ead7eef..a77ebfe 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -221,6 +221,14 @@ public class EntityArrow extends Entity implements IProjectile {
             float f3;
             float f4;
 
+            // 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
                 
diff --git a/src/main/java/net/minecraft/server/EntityProjectile.java b/src/main/java/net/minecraft/server/EntityProjectile.java
index ce3e628..005e995 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -146,6 +146,14 @@ 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 == EnumMovingObjectType.BLOCK && this.world.getType(movingobjectposition.a()).getBlock() == Blocks.PORTAL) {
                 this.aq();
diff --git a/src/main/java/net/minecraft/server/ItemBlock.java b/src/main/java/net/minecraft/server/ItemBlock.java
index a4b50fe..14ea66d 100644
--- a/src/main/java/net/minecraft/server/ItemBlock.java
+++ b/src/main/java/net/minecraft/server/ItemBlock.java
@@ -29,7 +29,7 @@ public class ItemBlock extends Item {
             return false;
         } else if (blockposition.getY() == 255 && this.a.getMaterial().isBuildable()) {
             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 ac11b9a..bebf181 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1656,6 +1656,14 @@ 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;
+                }
+            }
+            // PaperSpigot end
+
             if (!entity1.dead && entity1.k && entity1 != entity && (entity == null || entity.vehicle != entity1 && entity.passenger != entity1)) {
                 return false;
             }
-- 
1.9.1