Initial

.gitignore

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+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+.gradle
+build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Cache of project
+.gradletasknamecache
+
+**/build/
+
+# Common working directory
+run/
+runs/
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar

LICENSE.txt

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+The MIT License (MIT)
+
+Copyright (c) 2024 Alessandro "AlexDevs" Proto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

build.gradle

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+plugins {
+    id 'fabric-loom' version '1.8-SNAPSHOT'
+    id 'maven-publish'
+}
+
+version = project.mod_version
+group = project.maven_group
+
+base {
+    archivesName = project.archives_base_name
+}
+
+
+repositories {
+    // Add repositories to retrieve artifacts from in here.
+    // You should only use this when depending on other mods because
+    // Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
+    // See https://docs.gradle.org/current/userguide/declaring_repositories.html
+    // for more information about repositories.
+    maven {
+        name = "EngineHub"
+        url = "https://maven.enginehub.org/repo/"
+    }
+}
+
+dependencies {
+    // To change the versions see the gradle.properties file
+    minecraft "com.mojang:minecraft:${project.minecraft_version}"
+    mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+    modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+
+    modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+
+    modImplementation "com.sk89q.worldedit:worldedit-fabric-mc1.20:7.3.0-SNAPSHOT"
+}
+
+processResources {
+    inputs.property "version", project.version
+    inputs.property "minecraft_version", project.minecraft_version
+    inputs.property "loader_version", project.loader_version
+    filteringCharset "UTF-8"
+
+    filesMatching("fabric.mod.json") {
+        expand "version": project.version,
+                "minecraft_version": project.minecraft_version,
+                "loader_version": project.loader_version
+    }
+}
+
+def targetJavaVersion = 17
+tasks.withType(JavaCompile).configureEach {
+    // ensure that the encoding is set to UTF-8, no matter what the system default is
+    // this fixes some edge cases with special characters not displaying correctly
+    // see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
+    // If Javadoc is generated, this must be specified in that task too.
+    it.options.encoding = "UTF-8"
+    if (targetJavaVersion >= 10 || JavaVersion.current().isJava10Compatible()) {
+        it.options.release.set(targetJavaVersion)
+    }
+}
+
+java {
+    def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+    if (JavaVersion.current() < javaVersion) {
+        toolchain.languageVersion = JavaLanguageVersion.of(targetJavaVersion)
+    }
+    // Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+    // if it is present.
+    // If you remove this line, sources will not be generated.
+    withSourcesJar()
+}
+
+jar {
+    from("LICENSE") {
+        rename { "${it}_${project.archivesBaseName}" }
+    }
+}
+
+// configure the maven publication
+publishing {
+    publications {
+        create("mavenJava", MavenPublication) {
+            artifactId = project.archives_base_name
+            from components.java
+        }
+    }
+
+    // See https://docs.gradle.org/current/userguide/publishing_maven.html for information on how to set up publishing.
+    repositories {
+        // Add repositories to publish to here.
+        // Notice: This block does NOT have the same function as the block in the top level.
+        // The repositories here will be used for publishing your artifact, not for
+        // retrieving dependencies.
+    }
+}

gradle.properties

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+# Done to increase the memory available to gradle.
+org.gradle.jvmargs=-Xmx1G
+# Fabric Properties
+# check these on https://modmuss50.me/fabric.html
+minecraft_version=1.20.1
+yarn_mappings=1.20.1+build.10
+loader_version=0.16.9
+# Mod Properties
+mod_version=1.0-SNAPSHOT
+maven_group=me.alexdevs
+archives_base_name=claimcore
+# Dependencies
+# check this on https://modmuss50.me/fabric.html
+fabric_version=0.92.2+1.20.1
+worldeditapi_version=

gradle/wrapper/gradle-wrapper.properties

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+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip

settings.gradle

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+pluginManagement {
+    repositories {
+        maven {
+            name = 'Fabric'
+            url = 'https://maven.fabricmc.net/'
+        }
+        gradlePluginPortal()
+    }
+}

src/main/java/me/alexdevs/claimcore/ClaimCore.java

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+package me.alexdevs.claimcore;
+
+import com.sk89q.worldedit.WorldEdit;
+import com.sk89q.worldedit.fabric.FabricAdapter;
+import com.sk89q.worldedit.internal.cui.CUIEvent;
+import com.sk89q.worldedit.session.SessionOwner;
+import me.alexdevs.claimcore.core.ClaimManager;
+import me.alexdevs.claimcore.core.InteractionManager;
+import net.fabricmc.api.ModInitializer;
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
+import net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents;
+import net.fabricmc.fabric.api.event.player.UseBlockCallback;
+import net.fabricmc.fabric.api.event.player.UseItemCallback;
+import net.minecraft.block.Block;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
+import net.minecraft.registry.RegistryKeys;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.text.Text;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Hand;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.TypedActionResult;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ClaimCore implements ModInitializer {
+    public static final String MOD_ID = "claimcore";
+    public static final Logger LOGGER = LoggerFactory.getLogger(ClaimCore.class);
+    public static String claimToolName = "minecraft:golden_shovel";
+    public static Item claimTool;
+    public static String virtualBlockName = "minecraft:gold_block";
+    public static Block virtualBlock;
+
+    public static MinecraftServer server;
+
+    public static InteractionManager interactionManager;
+    public static final ClaimManager claimManager = new ClaimManager();
+
+    @Override
+    public void onInitialize() {
+        LOGGER.info("Initializing ClaimCore");
+
+        interactionManager = new InteractionManager();
+
+        ServerLifecycleEvents.SERVER_STARTING.register((server) -> {
+            ClaimCore.server = server;
+            claimTool = server.getRegistryManager().get(RegistryKeys.ITEM).get(Identifier.tryParse(claimToolName));
+            virtualBlock = server.getRegistryManager().get(RegistryKeys.BLOCK).get(Identifier.tryParse(virtualBlockName));
+        });
+
+
+    }
+}

src/main/java/me/alexdevs/claimcore/api/event/PlayerEquipmentChange.java

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+package me.alexdevs.claimcore.api.event;
+
+import net.fabricmc.fabric.api.event.Event;
+import net.fabricmc.fabric.api.event.EventFactory;
+import net.minecraft.entity.player.PlayerEntity;
+
+public interface PlayerEquipmentChange {
+    Event<PlayerEquipmentChange> EVENT = EventFactory.createArrayBacked(PlayerEquipmentChange.class, listeners -> (player) -> {
+        for (PlayerEquipmentChange listener : listeners) {
+            listener.changeEquipment(player);
+        }
+    });
+
+    void changeEquipment(PlayerEntity player);
+}

src/main/java/me/alexdevs/claimcore/core/Claim.java

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+package me.alexdevs.claimcore.core;
+
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+
+import java.util.UUID;
+
+public class Claim {
+    public enum ClaimType {
+        FLAT,
+        CUBIC,
+    }
+
+    public UUID owner;
+    public final BlockPos pos1;
+    public final BlockPos pos2;
+    public ClaimType type;
+    public World world;
+    public final Volume volume;
+
+    public Claim(UUID owner, BlockPos pos1, BlockPos pos2, World world, ClaimType type) {
+        this.owner = owner;
+        this.pos1 = pos1;
+        this.pos2 = pos2;
+        this.world = world;
+        this.type = type;
+        volume = new Volume(pos1, pos2);
+    }
+
+    public static Claim createFlatClaim(UUID owner, BlockPos pos1, BlockPos pos2, World world) {
+        // The engine says 2,032 in both +Y and -Y is the max possible value.
+        pos1 = new BlockPos(pos1.getX(), -2048, pos1.getZ());
+        pos2 = new BlockPos(pos2.getX(), +2048, pos2.getZ());
+        return new Claim(owner, pos1, pos2, world, ClaimType.FLAT);
+    }
+
+    public static Claim createCubicClaim(UUID owner, BlockPos pos1, BlockPos pos2, World world) {
+        return new Claim(owner, pos1, pos2, world, ClaimType.CUBIC);
+    }
+
+    public static class Volume {
+        public final int minX, minY, minZ;
+        public final int maxX, maxY, maxZ;
+
+        public Volume(BlockPos pos1, BlockPos pos2) {
+            this.minX = Math.min(pos1.getX(), pos2.getX());
+            this.maxX = Math.max(pos1.getX(), pos2.getX());
+            this.minY = Math.min(pos1.getY(), pos2.getY());
+            this.maxY = Math.max(pos1.getY(), pos2.getY());
+            this.minZ = Math.min(pos1.getZ(), pos2.getZ());
+            this.maxZ = Math.max(pos1.getZ(), pos2.getZ());
+        }
+
+        public boolean contains(BlockPos target) {
+            return target.getX() >= minX && target.getX() <= maxX &&
+                    target.getY() >= minY && target.getY() <= maxY &&
+                    target.getZ() >= minZ && target.getZ() <= maxZ;
+        }
+
+        public boolean intersects(Volume other) {
+            return (this.maxX >= other.minX && other.maxX >= this.minX)
+                    && (this.maxY >= other.minY && other.maxY >= this.minY)
+                    && (this.maxZ >= other.minZ && other.maxZ >= this.minZ);
+        }
+    }
+}

src/main/java/me/alexdevs/claimcore/core/ClaimManager.java

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+package me.alexdevs.claimcore.core;
+
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+
+public class ClaimManager {
+    public final ArrayList<Claim> claims = new ArrayList<>();
+
+
+    public ClaimManager() {
+
+    }
+
+    public void createClaim(Claim claim) {
+        claims.add(claim);
+    }
+
+    @Nullable
+    public Claim getClaimAtPosition(World world, BlockPos pos) {
+        for (Claim claim : claims) {
+            if(claim.volume.contains(pos))
+                return claim;
+        }
+        return null;
+    }
+}

src/main/java/me/alexdevs/claimcore/core/InteractionManager.java

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+package me.alexdevs.claimcore.core;
+
+import com.sk89q.worldedit.WorldEdit;
+import com.sk89q.worldedit.fabric.FabricAdapter;
+import com.sk89q.worldedit.internal.cui.SelectionPointEvent;
+import me.alexdevs.claimcore.ClaimCore;
+import me.alexdevs.claimcore.api.event.PlayerEquipmentChange;
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents;
+import net.fabricmc.fabric.api.event.player.AttackBlockCallback;
+import net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents;
+import net.fabricmc.fabric.api.event.player.UseBlockCallback;
+import net.minecraft.block.Block;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.network.packet.s2c.play.BlockUpdateS2CPacket;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.text.Text;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.math.BlockPos;
+
+import java.util.*;
+
+public class InteractionManager {
+    private final HashMap<UUID, BlockPos> areaSelections = new HashMap<>();
+    private final Queue<FakeBlock> fakeBlockQueue = new LinkedList<>();
+
+    public InteractionManager() {
+
+        UseBlockCallback.EVENT.register((playerEntity, world, hand, hitResult) -> {
+            var currentItem = playerEntity.getStackInHand(hand).getItem();
+            if(!currentItem.equals(ClaimCore.claimTool)) {
+                return ActionResult.PASS;
+            }
+
+            var playerUuid = playerEntity.getUuid();
+            var player = ClaimCore.server.getPlayerManager().getPlayer(playerUuid);
+            assert player != null;
+
+            var blockPos = hitResult.getBlockPos();
+            var playerWE = FabricAdapter.adaptPlayer(player);
+            var blockVector = FabricAdapter.adapt(blockPos);
+            var session = WorldEdit.getInstance().getSessionManager().get(playerWE);
+            if(areaSelections.containsKey(playerUuid)) {
+                session.dispatchCUIEvent(playerWE, new SelectionPointEvent(
+                        1, blockVector, 100L
+                ));
+                tryClaim(player, player.getServerWorld(), areaSelections.get(playerUuid), blockPos);
+                areaSelections.remove(playerUuid);
+                return ActionResult.FAIL;
+            }
+
+            areaSelections.put(playerUuid, blockPos);
+            player.sendMessage(
+                    Text.of("Selected first position: " + blockPos.toShortString())
+            );
+
+            session.dispatchCUIEvent(playerWE, new SelectionPointEvent(
+                    0, blockVector, 1L
+            ));
+
+            return ActionResult.FAIL;
+        });
+
+        PlayerEquipmentChange.EVENT.register(player -> {
+            if(!player.getMainHandStack().getItem().equals(ClaimCore.claimTool)) {
+                areaSelections.remove(player.getUuid());
+            }
+        });
+
+        ServerTickEvents.END_SERVER_TICK.register(server -> {
+            while(!fakeBlockQueue.isEmpty()) {
+                var fakeBlock  = fakeBlockQueue.poll();
+                fakeBlock.player.networkHandler.sendPacket(new BlockUpdateS2CPacket(
+                        fakeBlock.pos,
+                        fakeBlock.block.getDefaultState()
+                ));
+            }
+        });
+
+        AttackBlockCallback.EVENT.register((player, world, hand, pos, direction) -> {
+            var claim = ClaimCore.claimManager.getClaimAtPosition(world, pos);
+            if(claim == null) {
+                return ActionResult.PASS;
+            }
+
+            player.sendMessage(Text.of("You cannot grief this mf"));
+            return ActionResult.FAIL;
+        });
+
+
+        PlayerBlockBreakEvents.BEFORE.register((world, player, pos, state, blockEntity) -> {
+            var claim = ClaimCore.claimManager.getClaimAtPosition(world, pos);
+            return claim == null;
+        });
+    }
+
+    public void tryClaim(PlayerEntity player, ServerWorld world, BlockPos pos1, BlockPos pos2) {
+        var volume = new Claim.Volume(pos1, pos2);
+        for(var claim : ClaimCore.claimManager.claims) {
+            if(claim.volume.intersects(volume)) {
+                player.sendMessage(Text.of("Intersects with existing claim!"));
+                return;
+            }
+        }
+        ClaimCore.claimManager.createClaim(Claim.createFlatClaim(
+                player.getUuid(),
+                pos1,
+                pos2,
+                world
+        ));
+
+        player.sendMessage(Text.of("Created claim!"));
+    }
+
+    public record FakeBlock(ServerPlayerEntity player, BlockPos pos, Block block) {}
+}

src/main/java/me/alexdevs/claimcore/mixin/EquipmentChangesMixin.java

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+package me.alexdevs.claimcore.mixin;
+
+import me.alexdevs.claimcore.api.event.PlayerEquipmentChange;
+import net.minecraft.entity.EquipmentSlot;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.util.Map;
+
+@Mixin(LivingEntity.class)
+public class EquipmentChangesMixin {
+    @Inject(method = "getEquipmentChanges", at = @At(target = "Ljava/util/Map;put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;", value = "INVOKE"))
+    private void claimCore$getEquipmentChanges(CallbackInfoReturnable<Map<EquipmentSlot, ItemStack>> cir) {
+        if((Object)this instanceof PlayerEntity player) {
+            PlayerEquipmentChange.EVENT.invoker().changeEquipment(player);
+        }
+    }
+}

src/main/resources/claimcore.mixins.json

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+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "me.alexdevs.claimcore.mixin",
+  "compatibilityLevel": "JAVA_17",
+  "mixins": [
+    "EquipmentChangesMixin"
+  ],
+  "client": [
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}

src/main/resources/fabric.mod.json

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+{
+  "schemaVersion": 1,
+  "id": "claimcore",
+  "version": "${version}",
+  "name": "ClaimCore",
+  "description": "Fabric mod to protect player structures",
+  "authors": [],
+  "contact": {},
+  "license": "MIT",
+  "icon": "assets/claimcore/icon.png",
+  "environment": "server",
+  "entrypoints": {
+    "main": [
+      "me.alexdevs.claimcore.ClaimCore"
+    ]
+  },
+  "mixins": [
+    "claimcore.mixins.json"
+  ],
+  "depends": {
+    "fabricloader": ">=${loader_version}",
+    "fabric": "*",
+    "minecraft": "${minecraft_version}"
+  }
+}