Discord Rich Presence Plugin

This plugin integrates Navidrome with Discord Rich Presence, displaying your currently playing track in your Discord status. It demonstrates how a Navidrome plugin can maintain real-time connections to external services while remaining completely stateless. Based on the Navicord project.

⚠️ WARNING: This plugin requires storing Discord user tokens, which may violate Discord's Terms of Service. Use at your own risk.

Features

• Shows currently playing track with title, artist, and album art
• Displays playback progress with start/end timestamps
• Automatic presence clearing when track finishes
• Multi-user support with individual Discord tokens

How It Works

Plugin Capabilities

The plugin implements three Navidrome capabilities:

Capability	Purpose
Scrobbler	Receives NowPlaying events when users start playing tracks
WebSocketCallback	Handles incoming Discord gateway messages (heartbeat ACKs, sequence numbers)
SchedulerCallback	Processes scheduled events for heartbeats and presence clearing

Host Services

Service	Usage
HTTP	Discord API calls (gateway discovery, external assets registration)
WebSocket	Persistent connection to Discord gateway
Cache	Sequence numbers, processed image URLs
Scheduler	Recurring heartbeats, one-time presence clearing
Artwork	Track artwork public URL resolution

Flow

1. Track starts playing - Navidrome calls NowPlaying
2. Plugin connects - If not already connected, establishes WebSocket to Discord gateway
3. Authentication - Sends identify payload with user's Discord token
4. Presence update - Sends activity with track info and processed artwork URL
5. Heartbeat loop - Recurring scheduler sends heartbeats every 41 seconds to keep connection alive
6. Track ends - One-time scheduler callback clears presence and disconnects

Stateless Design

Navidrome plugins are stateless - each call creates a fresh instance. This plugin handles that by:

• WebSocket connections: Managed by host, keyed by username
• Sequence numbers: Stored in cache for heartbeat messages
• Configuration: Reloaded on every method call
• Artwork URLs: Cached after processing through Discord's external assets API

Image Processing

Discord requires images to be registered via their external assets API. The plugin:

1. Fetches track artwork URL from Navidrome
2. Registers it with Discord's API to get an mp: prefixed URL
3. Caches the result (4 hours for track art, 48 hours for default image)
4. Falls back to a default image if artwork is unavailable

Files

File	Description
main.go	Plugin entry point, scrobbler and scheduler implementations
rpc.go	Discord gateway communication, WebSocket handling, activity management
manifest.json	Plugin metadata and permission declarations
Makefile	Build automation

Configuration

Configure via the Navidrome UI under Settings > Plugins > Discord Rich Presence:

Field	Description
Client ID	Your Discord Application ID (create at Discord Developer Portal)
Users	Array of username/token pairs mapping Navidrome users to Discord tokens

Building

Although the plugin can be compiled to WebAssembly with standard Go, it is recommended to use TinyGo for smaller binary size.

# Run tests
make test

# Build plugin.wasm
make build

# Create distributable plugin package
make package

The make package command creates discord-rich-presence.ndp containing the compiled WebAssembly module and manifest.

Manual build:

tinygo build -target wasip1 -buildmode=c-shared -o plugin.wasm -scheduler=none .
zip discord-rich-presence.ndp plugin.wasm manifest.json

Using standard Go:

GOOS=wasip1 GOARCH=wasm go build -buildmode=c-shared -o plugin.wasm .
zip discord-rich-presence.ndp plugin.wasm manifest.json

Installation

1. Copy the discord-rich-presence.ndp file to your Navidrome plugins folder (default is plugins/ under the Navidrome data directory).
2. Configure the plugin in Settings > Plugins > Discord Rich Presence
3. Enable the plugin

There is no need to restart Navidrome; Check the logs for any errors during initialization.