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

From 70093c6d868924d6d2947cd7a5e952144c9cb44d 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 ca84d92..287566c 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -190,6 +190,14 @@ 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 0b28c88..91702f2 100644
--- a/src/main/java/net/minecraft/server/EntityFishingHook.java
+++ b/src/main/java/net/minecraft/server/EntityFishingHook.java
@@ -224,6 +224,15 @@ public class EntityFishingHook extends Entity {
 
         vec3d = new Vec3D(this.locX, this.locY, this.locZ);
         vec3d1 = new Vec3D(this.locX + this.motX, this.locY + this.motY, this.locZ + this.motZ);
+
+        // 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
             vec3d1 = new Vec3D(movingobjectposition.pos.x, movingobjectposition.pos.y, movingobjectposition.pos.z);
diff --git a/src/main/java/net/minecraft/server/EntityProjectile.java b/src/main/java/net/minecraft/server/EntityProjectile.java
index 40ac335..3d5548f 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 eb32871..58ec8b5 100644
--- a/src/main/java/net/minecraft/server/ItemBlock.java
+++ b/src/main/java/net/minecraft/server/ItemBlock.java
@@ -20,7 +20,7 @@ public class ItemBlock extends Item {
 
         ItemStack itemstack = entityhuman.b(enumhand);
 
-        if (!itemstack.isEmpty() && entityhuman.a(blockposition, enumdirection, itemstack) && world.a(this.a, blockposition, false, enumdirection, (Entity) null)) {
+        if (!itemstack.isEmpty() && entityhuman.a(blockposition, enumdirection, itemstack) && world.a(this.a, blockposition, false, enumdirection, entityhuman)) {  // 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 78b5a3c..2a38b1c 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1725,6 +1725,14 @@ 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;
             }
-- 
2.10.2