RemotePackSync

RemotePackSync is a lightweight Spigot 26.2 plugin that keeps a server resource pack synchronized with a remotely hosted SHA-1 checksum. It uses only the public Bukkit/Spigot API, so it runs unchanged on Spigot, Paper, Purpur, and Bukkit-compatible servers.

No NMS, packet libraries, or fork-specific APIs are used.

Requirements

• Java 25 (Minecraft/Spigot 26.2 requires Java 25)
• A Minecraft/Spigot 26.2-compatible server

Build

mvn clean package

The ready-to-install plugin is written to:

target/RemotePackSync.jar

Installation

1. Copy RemotePackSync.jar into the server's plugins/ directory.
2. Start the server once. RemotePackSync writes plugins/RemotePackSync/config.yml automatically.
3. Configure the resource-pack and SHA-1 URLs.
4. Restart the server, or run /remotepacksync reload as an operator.

Configuration

# Direct URL to the .zip resource pack. Leave blank to disable pack delivery.
resourcePackUrl: "https://cdn.example.com/server-pack.zip"

# URL to a text file containing the pack's SHA-1 checksum.
sha1Url: "https://cdn.example.com/server-pack.zip.sha1"

# Seconds between SHA-1 checks. Minimum: 30.
refreshInterval: 300

The SHA-1 response must contain a 40-character hexadecimal SHA-1. Both of these standard formats work:

0123456789abcdef0123456789abcdef01234567

0123456789abcdef0123456789abcdef01234567  server-pack.zip

Behaviour

• On startup and at every refresh interval, RemotePackSync fetches only the SHA-1 file asynchronously.
• When the SHA-1 changes, it sends the configured resource-pack URL and new hash to every online player.
• Players joining after a successful SHA-1 fetch receive the current resource pack.
• A failed request leaves the last known-good SHA-1 active, so a brief CDN outage does not interrupt existing pack delivery.
• If both URLs are blank, delivery is disabled without error. If only one is set, the configuration is rejected and delivery remains disabled.

Commands and permissions

• /remotepacksync reload (alias: /rps reload) reloads config.yml and begins a fresh asynchronous SHA-1 refresh.
• Permission: remotepacksync.reload (default: op).

Compatibility

RemotePackSync compiles against org.spigotmc:spigot-api:26.2-R0.1-SNAPSHOT and targets Java 25, which is required by Minecraft/Spigot 26.2. Resource packs are sent through Bukkit's stable Player#setResourcePack(String, byte[]) API.

License

MIT