From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 15 Jul 2020 19:34:11 -0700
Subject: [PATCH] Move range check for block placing up


diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 1486ac77bf4621a3a2a5da6d53461bada44c27c1..93f190cb2ccf59230a453356100e8e15fc174cc0 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1674,6 +1674,16 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
     }
     // Spigot end
 
+    // Paper start
+    private static final int SURVIVAL_PLACE_DISTANCE_SQUARED = 6 * 6;
+    private static final int CREATIVE_PLACE_DISTANCE_SQUARED = 7 * 7;
+    private boolean isOutsideOfReach(double x, double y, double z) {
+        Location eyeLoc = this.getCraftPlayer().getEyeLocation();
+        double reachDistance = org.bukkit.util.NumberConversions.square(eyeLoc.getX() - x) + org.bukkit.util.NumberConversions.square(eyeLoc.getY() - y) + org.bukkit.util.NumberConversions.square(eyeLoc.getZ() - z);
+        return reachDistance > (this.getCraftPlayer().getGameMode() == org.bukkit.GameMode.CREATIVE ? CREATIVE_PLACE_DISTANCE_SQUARED : SURVIVAL_PLACE_DISTANCE_SQUARED);
+    }
+    // Paper end
+
     @Override
     public void handleUseItemOn(ServerboundUseItemOnPacket packet) {
         PacketUtils.ensureRunningOnSameThread(packet, this, this.player.getLevel());
@@ -1688,15 +1698,18 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
 
         this.player.resetLastActionTime();
         int i = this.player.level.getMaxBuildHeight();
-        // CraftBukkit start
-        double distanceSqr = this.player.distanceToSqr((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D);
-        if (distanceSqr > 100.0D) {
+
+        // Paper start - improve distance check
+        final Vec3 clickedLocation = movingobjectpositionblock.getLocation();
+        if (isOutsideOfReach(blockposition.getX() + 0.5D, blockposition.getY() + 0.5D, blockposition.getZ() + 0.5D)
+            || !Double.isFinite(clickedLocation.x) || !Double.isFinite(clickedLocation.y) || !Double.isFinite(clickedLocation.z)
+            || isOutsideOfReach(clickedLocation.x, clickedLocation.y, clickedLocation.z)) {
             return;
         }
-        // CraftBukkit end
+        // Paper end
 
         if (blockposition.getY() < i) {
-            if (this.awaitingPositionFromClient == null && distanceSqr < 64.0D && worldserver.mayInteract(this.player, blockposition)) { // CraftBukkit - reuse value
+            if (this.awaitingPositionFromClient == null && this.player.distanceToSqr((double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D) < 64.0D && worldserver.mayInteract(this.player, blockposition)) { // CraftBukkit - reuse value // Paper - revert CB change
                 this.player.stopUsingItem(); // CraftBukkit - SPIGOT-4706
                 InteractionResult enuminteractionresult = this.player.gameMode.useItemOn(this.player, worldserver, itemstack, enumhand, movingobjectpositionblock);