Why plugins?

Currently desired but unsupported functions include:

Christoph: Dynamically assign bundles to user.
Markus: Create new bundles client-side; upload WAV files.
Nina/BAS: Grant database access based on auth tokens

New ideas may arise ...

How?

Plugin code can be written by anybody, will be reviewed by an Emu dev and then added in the main repo (in the plugins/ directory).
Plugins are only loaded for databases that request them.
If a database requests a plugin that is not available to the server, the database will not be loaded.
A plugin is one javascript file that constitutes a NodeJS module.
The protocol has eight message types (GETBUNDLE, SAVEBUNDLE, LOGONUSER etc.). A plugin can override any of the type-specific event handlers.

How things work

Database configuration

A database may contain a file nodejs_server_plugins.json at the top-level dir.
That file is a simple JSON object like this: { "pluginName": "somePlugin" }

Plugin loader

Plugins are loaded on a per-connection basis.
Plugins are loaded as soon as a connection is established.