# 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

```bash
mvn clean package
```

The ready-to-install plugin is written to:

```text
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

```yaml
# 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:

```text
0123456789abcdef0123456789abcdef01234567
```

```text
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