Cover Art Archive Plugin (Python)

A Python example plugin that fetches album cover images from the Cover Art Archive API using the MusicBrainz Release MBID.

Features

• Implements the nd_get_album_images method of the MetadataAgent plugin interface
• Returns front cover images for a given release MBID
• Returns not found if no MBID is provided or no images are found
• Demonstrates Python plugin development for Navidrome

Prerequisites

• extism-py - Python PDK compiler
  bashCopy

  curl -Ls https://raw.githubusercontent.com/extism/python-pdk/main/install.sh | bash
  

Note: extism-py requires Binaryen (wasm-merge, wasm-opt) to be installed.

Building

From the plugins/examples directory:

make coverartarchive-py.ndp

Or directly:

extism-py plugin/__init__.py -o plugin.wasm
zip -j coverartarchive-py.ndp manifest.json plugin.wasm

Installation

1. Copy coverartarchive-py.ndp to your Navidrome plugins folder

2. Enable plugins in navidrome.toml:

   tomlCopy

   [Plugins]
   Enabled = true
   Folder = "/path/to/plugins"
   

3. Add to your agents list:

   tomlCopy

   Agents = "coverartarchive-py,spotify,lastfm"
   

Testing

Extract the wasm file and test:

unzip -p coverartarchive-py.ndp plugin.wasm > coverartarchive-py.wasm
extism call coverartarchive-py.wasm nd_get_album_images --wasi \
  --input '{"name":"Dummy","artist":"Portishead","mbid":"76df3287-6cda-33eb-8e9a-044b5e15ffdd"}' \
  --allow-host "coverartarchive.org" --allow-host "archive.org"

How It Works

1. Album Image Request (nd_get_album_images): Receives album metadata including the MusicBrainz Release MBID.

2. API Query: Fetches cover art metadata from https://coverartarchive.org/release/{mbid}.

3. Response: Returns the front cover image URL if found.

API Reference

• Cover Art Archive API