Chest SignLock

Chest SignLock is a server-side Fabric mod for Minecraft 1.21.11. It lets players lock containers and doors with signs, using a familiar [Private] / [More Users] format.

Features

• Lockable blocks: chests, trapped chests, barrels, shulker boxes, dispensers, droppers, furnaces, blast furnaces, smokers, lecterns, beacons and all doors.
• Right-click a lockable block with a sign while not sneaking to create a protection sign automatically.
• First sign uses [Private] plus the owner name. Extra signs use [More Users] for additional allowed players.
• Double chests and doors are protected as a single linked object.
• Player UUIDs are stored in sign data when possible, while player names remain visible and usable.
• Unauthorized players cannot open protected blocks, edit protected signs or break protected blocks.
• Operators can bypass player-facing protections.
• Explosions cannot destroy protected blocks or their attached signs.
• Hoppers, hopper minecarts and copper golems cannot access protected inventories unless an attached sign contains [Redstone].
• Redstone cannot open protected doors unless an attached sign contains [Redstone].
• Optional debug mode logs who opened a protected block, how many signs are attached and which users are authorized.
• Built-in French and English messages.

Commands

• /chestlocklang fr: switch messages to French. OP only.
• /chestlocklang en: switch messages to English. OP only.
• /debuglockedchest: toggle debug logs. OP only.

Messages

Messages are generated in the server config folder:

config/ChestLockSign/messages.yml
config/ChestLockSign/messages/fr.yml
config/ChestLockSign/messages/en.yml

Normal chat messages use the orange [Chest SignLock] prefix. Debug lines use [Debug Signlock].

Support

For help, questions or bug reports, you can join the support Discord:

https://discord.gg/9uWSkXJUfc

The mod is planned to receive updates over time. I will try to update and maintain it as often as possible.

Build

Requirements:

• Java 21

Build the mod:

.\gradlew.bat build

The jar is generated in:

build/libs/chest-locksign-0.1.1.jar

For the local server workflow used during development:

.\build-and-install.bat

That script builds the mod and copies the jar to ../../mods.

Project Structure

• src/main/java/fr/yorick/localservermod/SimpleServerMod.java: main mod logic.
• src/main/java/fr/yorick/localservermod/mixin/: mixins for explosions, hoppers, copper golems and doors.
• src/main/resources/fabric.mod.json: Fabric metadata.
• src/main/resources/local_server_mod.mixins.json: mixin configuration.
• build.gradle: Gradle/Fabric Loom build.
• gradle.properties: Minecraft, Yarn, Loader, Fabric API and mod versions.

Notes

The mod id is still local_server_mod to keep existing stored sign attachments compatible with current worlds. The config folder is ChestLockSign for easier server administration.

License

This project is licensed under the MIT License.

Credits

Sign Lock is inspired by BlockLocker, the classic Minecraft sign-based protection plugin by Rutger Kok and contributors.

This project is an independent mod implementation and is not affiliated with or endorsed by BlockLocker.