From 51fa638e2b37570add22f0fd94492da0c0b05d54 Mon Sep 17 00:00:00 2001
From: Zach Brown <Zbob750@live.com>
Date: Sun, 18 May 2014 16:35:38 -0500
Subject: [PATCH] Invisible 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 de8dda7..69e254a 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -3,6 +3,7 @@ package net.minecraft.server;
 import java.util.List;
 
 // CraftBukkit start
+import org.bukkit.craftbukkit.entity.CraftPlayer; // PaperSpigot
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.event.entity.EntityCombustByEntityEvent;
 import org.bukkit.event.player.PlayerPickupItemEvent;
@@ -220,6 +221,16 @@ public class EntityArrow extends Entity implements IProjectile {
             float f2;
             float f3;
 
+            // PaperSpigot start - Allow projectiles and arrows to pass through players the shooter can't see
+            if(movingobjectposition != null && movingobjectposition.entity instanceof EntityPlayer && shooter != null && shooter instanceof EntityPlayer) {
+                CraftPlayer playerBlocking = ((EntityPlayer) movingobjectposition.entity).getBukkitEntity();
+                CraftPlayer playerShooter = ((EntityPlayer)shooter).getBukkitEntity();
+                if(!playerShooter.canSee(playerBlocking)) {
+                    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/World.java b/src/main/java/net/minecraft/server/World.java
index b7509c4..9741e94 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -14,6 +14,7 @@ import java.util.concurrent.Callable;
 // CraftBukkit start
 import org.bukkit.Bukkit;
 import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.entity.CraftPlayer; // PaperSpigot
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.craftbukkit.util.LongHashSet;
 import org.bukkit.craftbukkit.SpigotTimings; // Spigot
@@ -1666,6 +1667,15 @@ 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 when the player can't see an invisible player
+            if (entity != null && entity instanceof EntityPlayer && entity1 != null && entity1 instanceof EntityPlayer) {
+                CraftPlayer placer = ((EntityPlayer)entity).getBukkitEntity();
+                CraftPlayer blocking = ((EntityPlayer)entity1).getBukkitEntity();
+                if(!placer.canSee(blocking)) {
+                    continue;
+                }
+            }
+            // PaperSpigot end
 
             if (!entity1.dead && entity1.k && entity1 != entity) {
                 return false;
-- 
1.9.1