# RemotePackSync

RemotePackSync is a lightweight **Spigot 26.2** plugin that keeps Java Edition resource packs synchronized with a remotely hosted SHA-1 checksum and optionally serves a local Bedrock Edition pack to players connecting through **GeyserMC**. It uses only public Bukkit/Spigot and Geyser APIs, so it runs on **Spigot, Paper, Purpur, Bukkit-compatible servers, and current GeyserMC**.

No NMS, packet libraries, or server-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 Java SHA-1 and Bedrock pack checks. Minimum: 30.
refreshInterval: 300

# Optional local Bedrock Edition pack for GeyserMC players. Accepts .mcpack or .zip.
# Relative paths are resolved from plugins/RemotePackSync/.
bedrockResourcePack: "bedrock/server-pack.mcpack"
```

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

### Java Edition

- 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.

### Bedrock Edition through GeyserMC

- Set `bedrockResourcePack` to a local `.mcpack` or `.zip` file. `.mcpack` is fully supported.
- The source pack is checked asynchronously at `refreshInterval`. When its SHA-256 changes, RemotePackSync creates a managed copy under `plugins/RemotePackSync/bedrock-managed/`.
- The managed copy receives a deterministic new header UUID derived from the updated source SHA-256. This makes Bedrock clients treat a changed pack as a new pack, while Geyser calculates and supplies the required final pack hash and size.
- The original configured pack is never modified.
- Every new Geyser Bedrock connection receives the latest successfully processed pack through Geyser's public `SessionLoadResourcePacksEvent` API.
- The pack must be a valid Bedrock pack containing `manifest.json` at the archive root. Geyser does **not** convert Java packs into Bedrock packs.
- Bedrock's protocol only negotiates packs while a client connects. Players already connected when the file changes must reconnect to receive the new version; RemotePackSync cannot hot-push a replacement to an active Bedrock session.
- If Geyser is absent, Java Edition resource-pack operation continues normally and Bedrock delivery stays 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 Geyser API `2.11.0-SNAPSHOT`, targeting Java 25 as required by Minecraft/Spigot 26.2. Java packs are sent through Bukkit's stable `Player#setResourcePack(String, byte[])` API; Bedrock packs use Geyser's public pack/session API. Geyser is a soft dependency, so Java-only servers remain supported.

## License

MIT