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 6acc4ee50ba32a208930bda89d37f155e3f4835a..0f031b094a180bcce1fe3b388321db838ca4df63 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1686,6 +1686,16 @@ 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());
@@ -1699,6 +1709,15 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
         BlockPos blockposition = movingobjectpositionblock.getBlockPos();
         Vec3 vec3d1 = vec3d.subtract(Vec3.atCenterOf(blockposition));
 
+        // 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;
+        }
+        // Paper end
+
         if (this.player.level.getServer() != null && this.player.chunkPosition().getChessboardDistance(new ChunkPos(blockposition)) < this.player.level.spigotConfig.viewDistance) { // Spigot
             double d0 = 1.0000001D;