Added the lock item

src/main/java/dev/hephaestus/glowcase/Glowcase.java

@@ -13,6 +13,7 @@
 import dev.hephaestus.glowcase.block.entity.SpriteBlockEntity;
 import dev.hephaestus.glowcase.block.entity.TextBlockEntity;
 import dev.hephaestus.glowcase.compat.PolydexCompatibility;
+import dev.hephaestus.glowcase.item.LockItem;
 import net.fabricmc.api.ModInitializer;
 import net.fabricmc.fabric.api.itemgroup.v1.FabricItemGroup;
 import net.fabricmc.loader.api.FabricLoader;
@@ -58,6 +59,8 @@ public class Glowcase implements ModInitializer {
 	public static final Supplier<BlockItem> SPRITE_BLOCK_ITEM = registerItem("sprite_block", () -> new BlockItem(SPRITE_BLOCK.get(), new Item.Settings()));
 	public static final Supplier<BlockEntityType<SpriteBlockEntity>> SPRITE_BLOCK_ENTITY = registerBlockEntity("sprite_block", () -> BlockEntityType.Builder.create(SpriteBlockEntity::new, SPRITE_BLOCK.get()).build(null));
 
+	public static final Supplier<Item> LOCK_ITEM = registerItem("lock", () -> new LockItem(new Item.Settings()));
+
 	public static final Supplier<ItemGroup> ITEM_GROUP = registerItemGroup("items", () -> FabricItemGroup.builder()
 		.displayName(Text.translatable("itemGroup.glowcase.items"))
 		.icon(() -> new ItemStack(Items.GLOWSTONE))
@@ -67,6 +70,7 @@ public class Glowcase implements ModInitializer {
 			entries.add(TEXT_BLOCK_ITEM.get());
 			entries.add(POPUP_BLOCK_ITEM.get());
 			entries.add(SPRITE_BLOCK_ITEM.get());
+			entries.add(LOCK_ITEM.get());
 		})
 		.build()
 	);

src/main/java/dev/hephaestus/glowcase/item/LockItem.java

@@ -0,0 +1,62 @@
+package dev.hephaestus.glowcase.item;
+
+import dev.hephaestus.glowcase.mixin.LockableContainerBlockEntityAccessor;
+import net.minecraft.block.entity.LockableContainerBlockEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.inventory.ContainerLock;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.ItemUsageContext;
+import net.minecraft.item.tooltip.TooltipType;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.sound.SoundEvent;
+import net.minecraft.sound.SoundEvents;
+import net.minecraft.text.Text;
+import net.minecraft.util.ActionResult;
+import net.minecraft.util.Formatting;
+import net.minecraft.world.World;
+
+import java.util.List;
+
+public class LockItem extends Item {
+	public LockItem(Settings settings) {
+		super(settings);
+	}
+
+	@Override
+	public ActionResult useOnBlock(ItemUsageContext context) {
+		World world = context.getWorld();
+		PlayerEntity player = context.getPlayer();
+		if (world.isClient ||
+			player == null ||
+			!player.isCreative() ||
+			!(world.getBlockEntity(context.getBlockPos()) instanceof LockableContainerBlockEntity be)) {
+			return ActionResult.PASS;
+		}
+
+		var bea = (LockableContainerBlockEntityAccessor) be;
+		Text message;
+		SoundEvent soundEvent;
+
+		if (bea.getLock().equals(ContainerLock.EMPTY)) {
+			bea.setLock(new ContainerLock("glowcase"));
+			message = Text.translatable("gui.glowcase.locked_block", be.getDisplayName());
+			soundEvent = SoundEvents.BLOCK_WOODEN_TRAPDOOR_CLOSE;
+		} else {
+			bea.setLock(ContainerLock.EMPTY);
+			message = Text.translatable("gui.glowcase.unlocked_block", be.getDisplayName());
+			soundEvent = SoundEvents.BLOCK_WOODEN_TRAPDOOR_OPEN;
+		}
+
+		player.sendMessage(message, true);
+		player.playSoundToPlayer(soundEvent, SoundCategory.BLOCKS, 1.0F, 1.0F);
+		be.markDirty();
+
+		return ActionResult.SUCCESS;
+	}
+
+	@Override
+	public void appendTooltip(ItemStack itemStack, Item.TooltipContext context, List<Text> tooltip, TooltipType options) {
+		tooltip.add(Text.translatable("item.glowcase.lock.tooltip.0").formatted(Formatting.GRAY));
+	}
+}

src/main/java/dev/hephaestus/glowcase/mixin/LockableContainerBlockEntityAccessor.java

@@ -0,0 +1,15 @@
+package dev.hephaestus.glowcase.mixin;
+
+import net.minecraft.block.entity.LockableContainerBlockEntity;
+import net.minecraft.inventory.ContainerLock;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(LockableContainerBlockEntity.class)
+public interface LockableContainerBlockEntityAccessor {
+	@Accessor
+	ContainerLock getLock();
+
+	@Accessor
+	void setLock(ContainerLock lock);
+}

src/main/java/dev/hephaestus/glowcase/mixin/PlayerEntityMixin.java

@@ -0,0 +1,24 @@
+package dev.hephaestus.glowcase.mixin;
+
+import com.llamalad7.mixinextras.injector.ModifyReturnValue;
+import dev.hephaestus.glowcase.Glowcase;
+import net.minecraft.entity.EquipmentSlot;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+
+@Mixin(PlayerEntity.class)
+public abstract class PlayerEntityMixin {
+	@Shadow
+	public abstract ItemStack getEquippedStack(EquipmentSlot slot);
+
+	@ModifyReturnValue(
+		method = "shouldCancelInteraction",
+		at = @At(value = "RETURN")
+	)
+	private boolean directLockInteraction(boolean original) {
+		return getEquippedStack(EquipmentSlot.MAINHAND).getItem().equals(Glowcase.LOCK_ITEM.get()) || original;
+	}
+}

src/main/resources/assets/glowcase/lang/en_us.json

@@ -15,6 +15,9 @@
 	"gui.glowcase.none": "(None)",
 	"item.glowcase.text_block": "Text Block",
 	"item.glowcase.hyperlink_block": "Hyperlink Block",
+	"item.glowcase.lock": "Lock",
+	"gui.glowcase.locked_block": "%s is now locked \uD83D\uDD12",
+	"gui.glowcase.unlocked_block": "%s is now unlocked \uD83D\uDD13",
 	"gui.glowcase.title": "Title",
 	"gui.glowcase.url": "URL",
 	"block.glowcase.generic.tooltip": "Interact with a glowcase item to edit",
@@ -27,5 +30,6 @@
 	"block.glowcase.popup_block.tooltip.0": "Displays formatted text when interacted",
 	"block.glowcase.popup_block.tooltip.1": "Supports Placeholder QuickText",
 	"block.glowcase.sprite_block.tooltip.0": "Displays a sprite",
-	"block.glowcase.sprite_block.tooltip.1": "Can be extended with resource packs"
+	"block.glowcase.sprite_block.tooltip.1": "Can be extended with resource packs",
+	"item.glowcase.lock.tooltip.0": "Locks and unlocks containers"
 }

src/main/resources/assets/glowcase/models/item/lock.json

@@ -0,0 +1,6 @@
+{
+	"parent": "item/generated",
+	"textures": {
+		"layer0": "glowcase:item/lock"
+	}
+}

src/main/resources/fabric.mod.json

@@ -17,6 +17,9 @@
 	},
 	"license": "${license}",
 	"icon": "assets/${modId}/icon.png",
+	"mixins": [
+		"${modId}.mixins.json"
+	],
 	"depends": {
 		"minecraft": ">=${mc}",
 		"fabricloader": ">=${fl}",

src/main/resources/glowcase.mixins.json

@@ -0,0 +1,15 @@
+{
+	"required": true,
+	"minVersion": "0.8",
+	"package": "dev.hephaestus.glowcase.mixin",
+	"compatibilityLevel": "JAVA_21",
+	"mixins": [
+		"LockableContainerBlockEntityAccessor",
+		"PlayerEntityMixin"
+	],
+	"client": [],
+	"server": [],
+	"injectors": {
+		"defaultRequire": 1
+	}
+}