From 4a4dbdc85d1ba862ac43f5ab115bd4be3a2957ee Mon Sep 17 00:00:00 2001
From: Zach Brown <Zbob750@live.com>
Date: Mon, 21 Jul 2014 18:46:53 -0500
Subject: [PATCH] Invisible players don't have rights

Adapted from CraftBukkit PR #1319 https://github.com/Bukkit/CraftBukkit/pull/1319

diff --git a/src/main/java/net/minecraft/server/EntityArrow.java b/src/main/java/net/minecraft/server/EntityArrow.java
index de8dda7..dbb420b 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 players
+            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 7f8a33b..73f52ac 100644
--- a/src/main/java/net/minecraft/server/EntityProjectile.java
+++ b/src/main/java/net/minecraft/server/EntityProjectile.java
@@ -148,6 +148,14 @@ public abstract class EntityProjectile extends Entity implements IProjectile {
             }
         }
 
+        // PaperSpigot start - Allow projectiles to fly through 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.b, movingobjectposition.c, movingobjectposition.d) == Blocks.PORTAL) {
                 this.ah();
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 744d942..a204966 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1666,6 +1666,13 @@ 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 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) {
                 return false;
-- 
1.9.1