Preliminary PlotSquared support for SetBlockBuffer packet

src/main/java/com/moulberry/axiom/integration/Box.java

@@ -0,0 +1,68 @@
+package com.moulberry.axiom.integration;
+
+import net.minecraft.core.BlockPos;
+import org.jetbrains.annotations.Nullable;
+
+public record Box(int minX, int minY, int minZ, int maxX, int maxY, int maxZ) {
+
+    @Nullable
+    public Box tryCombine(Box other) {
+        if (this.completelyOverlaps(other)) {
+            return this;
+        }
+
+        if (other.completelyOverlaps(this)) {
+            return other;
+        }
+
+        if (other.minX == this.minX && other.maxX == this.maxX) {
+            if (other.minY == this.minY && other.maxY == this.maxY) {
+                if (areLineSegmentsContinuous(other.minZ, other.maxZ, this.minZ, this.maxZ)) {
+                    return new Box(
+                        other.minX, other.minY, Math.min(other.minZ, this.minZ),
+                        other.maxX, other.maxY, Math.max(other.maxZ, this.maxZ)
+                    );
+                }
+            } else if (other.minZ == this.minZ && other.maxZ == this.maxZ) {
+                if (areLineSegmentsContinuous(other.minY, other.maxY, this.minY, this.maxY)) {
+                    return new Box(
+                        other.minX, Math.min(other.minY, this.minY), other.minZ,
+                        other.maxX, Math.max(other.maxY, this.maxY), other.maxZ
+                    );
+                }
+            }
+        } else if (other.minY == this.minY && other.maxY == this.maxY &&
+                other.minZ == this.minZ && other.maxZ == this.maxZ) {
+            if (areLineSegmentsContinuous(other.minX, other.maxX, this.minX, this.maxX)) {
+                return new Box(
+                    Math.min(other.minX, this.minX), other.minY, other.minZ,
+                    Math.max(other.maxX, this.maxX), other.maxY, other.maxZ
+                );
+            }
+        }
+
+        return null; // Not able to combine
+    }
+
+    public boolean completelyOverlaps(Box other) {
+        return this.minX() <= other.minX() && this.minY() <= other.minY() && this.minZ() <= other.minZ() &&
+                this.maxX() >= other.maxX() && this.maxY() >= other.maxY() && this.maxZ() >= other.maxZ();
+    }
+
+    public boolean contains(int x, int y, int z) {
+        return this.minX() <= x && this.minY() <= y && this.minZ() <= z &&
+                this.maxX() >= x && this.maxY() >= y && this.maxZ() >= z;
+    }
+
+    private static boolean areLineSegmentsContinuous(int min1, int max1, int min2, int max2) {
+        int size1 = max1 - min1 + 1;
+        int size2 = max2 - min2 + 1;
+
+        float mid1 = (min1 + max1);
+        float mid2 = (min2 + max2);
+
+        float midDiff = Math.abs(mid1 - mid2);
+        return midDiff <= size1 + size2;
+    }
+
+}

src/main/java/com/moulberry/axiom/integration/SectionPermissionChecker.java

@@ -0,0 +1,137 @@
+package com.moulberry.axiom.integration;
+
+import java.util.List;
+
+public interface SectionPermissionChecker {
+
+    boolean allAllowed();
+    boolean noneAllowed();
+    boolean allowed(int x, int y, int z);
+    Box bounds();
+
+    static SectionPermissionChecker fromAllowedBoxes(List<Box> allowed) {
+        if (allowed.isEmpty()) return NONE_ALLOWED;
+
+        if (allowed.size() == 1) {
+            Box allowedBox = allowed.get(0);
+            if (allowedBox.completelyOverlaps(FULL_BOUNDS)) {
+                return ALL_ALLOWED;
+            } else {
+                return new AllAllowedInBox(allowedBox);
+            }
+        }
+
+        int minBoundsX = 15;
+        int minBoundsY = 15;
+        int minBoundsZ = 15;
+        int maxBoundsX = 0;
+        int maxBoundsY = 0;
+        int maxBoundsZ = 0;
+
+        for (Box box : allowed) {
+            minBoundsX = Math.min(box.minX(), minBoundsX);
+            minBoundsY = Math.min(box.minY(), minBoundsY);
+            minBoundsZ = Math.min(box.minZ(), minBoundsZ);
+            maxBoundsX = Math.max(box.maxX(), maxBoundsX);
+            maxBoundsY = Math.max(box.maxY(), maxBoundsY);
+            maxBoundsZ = Math.max(box.maxZ(), maxBoundsZ);
+        }
+
+        return new AllAllowedBoxes(new Box(minBoundsX, minBoundsY, minBoundsZ, maxBoundsX, maxBoundsY, maxBoundsZ), allowed);
+    }
+
+    record AllAllowedInBox(Box box) implements SectionPermissionChecker {
+        @Override
+        public boolean allAllowed() {
+            return true;
+        }
+
+        @Override
+        public boolean noneAllowed() {
+            return false;
+        }
+
+        @Override
+        public boolean allowed(int x, int y, int z) {
+            return true;
+        }
+
+        @Override
+        public Box bounds() {
+            return box;
+        }
+    }
+
+    record AllAllowedBoxes(Box bounds, List<Box> allowed) implements SectionPermissionChecker {
+        @Override
+        public boolean allAllowed() {
+            return false;
+        }
+
+        @Override
+        public boolean noneAllowed() {
+            return false;
+        }
+
+        @Override
+        public boolean allowed(int x, int y, int z) {
+            for (Box box : this.allowed) {
+                if (box.contains(x, y, z)) return true;
+            }
+            return false;
+        }
+
+        @Override
+        public Box bounds() {
+            return this.bounds;
+        }
+    }
+
+    Box FULL_BOUNDS = new Box(0, 0, 0, 15, 15, 15);
+    SectionPermissionChecker ALL_ALLOWED = new SectionPermissionChecker() {
+        @Override
+        public boolean allAllowed() {
+            return true;
+        }
+
+        @Override
+        public boolean noneAllowed() {
+            return false;
+        }
+
+        @Override
+        public boolean allowed(int x, int y, int z) {
+            return true;
+        }
+
+        @Override
+        public Box bounds() {
+            return FULL_BOUNDS;
+        }
+    };
+
+
+    Box EMPTY_BOUNDS = new Box(0, 0, 0, 0, 0, 0);
+    SectionPermissionChecker NONE_ALLOWED = new SectionPermissionChecker() {
+        @Override
+        public boolean allAllowed() {
+            return false;
+        }
+
+        @Override
+        public boolean noneAllowed() {
+            return true;
+        }
+
+        @Override
+        public boolean allowed(int x, int y, int z) {
+            return false;
+        }
+
+        @Override
+        public Box bounds() {
+            return EMPTY_BOUNDS;
+        }
+    };
+
+}

src/main/java/com/moulberry/axiom/integration/plotsquared/PlotSquaredIntegration.java

@@ -1,6 +1,7 @@
 package com.moulberry.axiom.integration.plotsquared;
 
 
+import com.moulberry.axiom.integration.SectionPermissionChecker;
 import org.bukkit.Bukkit;
 import org.bukkit.World;
 import org.bukkit.block.Block;
@@ -30,4 +31,11 @@ public class PlotSquaredIntegration {
         return PlotSquaredIntegrationImpl.isPlotWorld(world);
     }
 
+    public static SectionPermissionChecker checkSection(Player player, World world, int sectionX, int sectionY, int sectionZ) {
+        if (!Bukkit.getPluginManager().isPluginEnabled("PlotSquared")) {
+            return SectionPermissionChecker.ALL_ALLOWED;
+        }
+        return PlotSquaredIntegrationImpl.checkSection(player, world, sectionX, sectionY, sectionZ);
+    }
+
 }

src/main/java/com/moulberry/axiom/integration/plotsquared/PlotSquaredIntegrationImpl.java

@@ -1,5 +1,7 @@
 package com.moulberry.axiom.integration.plotsquared;
 
+import com.moulberry.axiom.integration.Box;
+import com.moulberry.axiom.integration.SectionPermissionChecker;
 import com.plotsquared.bukkit.player.BukkitPlayer;
 import com.plotsquared.bukkit.util.BukkitUtil;
 import com.plotsquared.core.PlotSquared;
@@ -8,17 +10,20 @@ import com.plotsquared.core.location.Location;
 import com.plotsquared.core.permissions.Permission;
 import com.plotsquared.core.plot.Plot;
 import com.plotsquared.core.plot.PlotArea;
+import com.plotsquared.core.plot.PlotId;
 import com.plotsquared.core.plot.flag.implementations.BreakFlag;
 import com.plotsquared.core.plot.flag.implementations.DoneFlag;
 import com.plotsquared.core.plot.flag.types.BlockTypeWrapper;
 import com.sk89q.worldedit.bukkit.BukkitAdapter;
+import com.sk89q.worldedit.math.BlockVector3;
+import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.world.block.BlockType;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
 
-import java.util.List;
+import java.util.*;
-import java.util.WeakHashMap;
 
 /*
  * PlotSquared, a land and world management plugin for Minecraft.
@@ -117,6 +122,7 @@ public class PlotSquaredIntegrationImpl {
     }
 
     private static final WeakHashMap<World, Boolean> plotWorldCache = new WeakHashMap<>();
+
     static boolean isPlotWorld(World world) {
         if (plotWorldCache.containsKey(world)) {
             return plotWorldCache.get(world);
@@ -134,7 +140,85 @@ public class PlotSquaredIntegrationImpl {
 
         plotWorldCache.put(world, isPlotWorld);
         return isPlotWorld;
-
     }
 
-}
+    static SectionPermissionChecker checkSection(Player player, World world, int sectionX, int sectionY, int sectionZ) {
+        int minX = sectionX * 16;
+        int minY = sectionY * 16;
+        int minZ = sectionZ * 16;
+        int maxX = sectionX * 16 + 15;
+        int maxY = sectionY * 16 + 15;
+        int maxZ = sectionZ * 16 + 15;
+
+        PlotArea[] plotAreas = PlotSquared.get().getPlotAreaManager().getPlotAreas(world.getName(), new CuboidRegion(
+                BlockVector3.at(minX, minY, minZ),
+                BlockVector3.at(maxX, maxY, maxZ)
+        ));
+
+        if (plotAreas.length == 0) {
+            return SectionPermissionChecker.ALL_ALLOWED;
+        }
+
+        Set<Plot> checkedPlots = new HashSet<>();
+        List<Box> allowed = new ArrayList<>();
+
+        for (PlotArea plotArea : plotAreas) {
+            for (int px = minX; px <= maxX; px += 15) {
+                for (int py = minY; py <= maxY; py += 15) {
+                    for (int pz = minZ; pz <= maxZ; pz += 15) {
+                        PlotId pid = plotArea.getPlotManager().getPlotId(px, py, pz);
+                        if (pid == null) continue;
+                        Plot plot = plotArea.getOwnedPlotAbs(pid);
+                        if (plot == null) continue;
+
+                        if (!checkedPlots.add(plot)) continue;
+
+                        if (!plot.hasOwner()) continue;
+                        if (!plot.isAdded(player.getUniqueId())) continue;
+                        if (Settings.Done.RESTRICT_BUILDING && DoneFlag.isDone(plot)) continue;
+
+                        Location bottom = plot.getBottomAbs();
+                        Location top = plot.getTopAbs();
+
+                        int minPlotX = Math.max(Math.min(bottom.getX(), top.getX()), minX);
+                        int minPlotY = Math.max(Math.min(bottom.getY(), top.getY()), minY);
+                        int minPlotZ = Math.max(Math.min(bottom.getZ(), top.getZ()), minZ);
+                        int maxPlotX = Math.min(Math.max(bottom.getX(), top.getX()), maxX);
+                        int maxPlotY = Math.min(Math.max(bottom.getY(), top.getY()), maxY);
+                        int maxPlotZ = Math.min(Math.max(bottom.getZ(), top.getZ()), maxZ);
+
+                        if (minPlotX <= minX && minPlotY <= minY && minPlotZ <= minZ &&
+                                maxPlotX >= maxX && maxPlotY >= maxY && maxPlotZ >= maxZ) {
+                            return SectionPermissionChecker.ALL_ALLOWED;
+                        }
+
+                        allowed.add(new Box(minPlotX - minX, minPlotY - minY, minPlotZ - minZ,
+                                maxPlotX - minX, maxPlotY - minY, maxPlotZ - minZ));
+                    }
+                }
+            }
+        }
+
+        // Combine
+        main:
+        while (allowed.size() >= 2) {
+            for (int i = 0; i < allowed.size() - 1; i++) {
+                Box first = allowed.get(i);
+                for (int j = i + 1; j < allowed.size(); j++) {
+                    Box second = allowed.get(j);
+
+                    Box combined = first.tryCombine(second);
+                    if (combined != null) {
+                        allowed.remove(j);
+                        allowed.remove(i);
+                        allowed.add(combined);
+                        continue main;
+                    }
+                }
+            }
+            break;
+        }
+
+        return SectionPermissionChecker.fromAllowedBoxes(allowed);
+    }
+}

src/main/java/com/moulberry/axiom/packet/SetBlockBufferPacketListener.java

@@ -6,6 +6,8 @@ import com.moulberry.axiom.buffer.BiomeBuffer;
 import com.moulberry.axiom.buffer.BlockBuffer;
 import com.moulberry.axiom.buffer.CompressedBlockEntity;
 import com.moulberry.axiom.event.AxiomModifyWorldEvent;
+import com.moulberry.axiom.integration.SectionPermissionChecker;
+import com.moulberry.axiom.integration.plotsquared.PlotSquaredIntegration;
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 import it.unimi.dsi.fastutil.shorts.Short2ObjectMap;
 import net.minecraft.core.BlockPos;
@@ -35,6 +37,7 @@ import net.minecraft.world.level.chunk.PalettedContainer;
 import net.minecraft.world.level.levelgen.Heightmap;
 import net.minecraft.world.level.lighting.LightEngine;
 import org.bukkit.Bukkit;
+import org.bukkit.Location;
 import xyz.jpenilla.reflectionremapper.ReflectionRemapper;
 
 import java.lang.reflect.InvocationTargetException;
@@ -116,6 +119,11 @@ public class SetBlockBufferPacketListener {
                     continue;
                 }
 
+                SectionPermissionChecker checker = PlotSquaredIntegration.checkSection(player.getBukkitEntity(), world.getWorld(), cx, cy, cz);
+                if (checker != null && checker.noneAllowed()) {
+                    continue;
+                }
+
                 LevelChunk chunk = world.getChunk(cx, cz);
 
                 LevelChunkSection section = chunk.getSection(world.getSectionIndexFromSectionY(cy));
@@ -144,9 +152,28 @@ public class SetBlockBufferPacketListener {
 
                 Short2ObjectMap<CompressedBlockEntity> blockEntityChunkMap = buffer.getBlockEntityChunkMap(entry.getLongKey());
 
-                for (int x = 0; x < 16; x++) {
+                int minX = 0;
-                    for (int y = 0; y < 16; y++) {
+                int minY = 0;
-                        for (int z = 0; z < 16; z++) {
+                int minZ = 0;
+                int maxX = 15;
+                int maxY = 15;
+                int maxZ = 15;
+
+                if (checker != null) {
+                    minX = checker.bounds().minX();
+                    minY = checker.bounds().minY();
+                    minZ = checker.bounds().minZ();
+                    maxX = checker.bounds().maxX();
+                    maxY = checker.bounds().maxY();
+                    maxZ = checker.bounds().maxZ();
+                    if (checker.allAllowed()) {
+                        checker = null;
+                    }
+                }
+
+                for (int x = minX; x <= maxX; x++) {
+                    for (int y = minY; y <= maxY; y++) {
+                        for (int z = minZ; z <= maxZ; z++) {
                             BlockState blockState = container.get(x, y, z);
                             if (blockState == emptyState) continue;
 
@@ -158,6 +185,8 @@ public class SetBlockBufferPacketListener {
                                 continue;
                             }
 
+                            if (checker != null && !checker.allowed(x, y, z)) continue;
+
                             BlockState old = section.setBlockState(x, y, z, blockState, true);
                             if (blockState != old) {
                                 sectionChanged = true;
@@ -284,6 +313,9 @@ public class SetBlockBufferPacketListener {
 
                 var holder = registry.getHolder(biome);
                 if (holder.isPresent()) {
+                    if (!PlotSquaredIntegration.canPlaceBlock(player.getBukkitEntity(),
+                            new Location(player.getBukkitEntity().getWorld(), x+1, y+1, z+1))) return;
+
                     container.set(x & 3, y & 3, z & 3, holder.get());
                     changedChunks.add(chunk);
                 }