note: in addition to event hooks (the stuff described here), copyparty has another api to run your programs/scripts while providing way more information such as audio tags / video codecs / etc and optionally daisychaining data between scripts in a processing pipeline; if that's what you want then see mtp plugins instead

after upload

notify.py shows a desktop notification (example)
- notify2.py uses the json API to show more context
image-noexif.py removes image exif by overwriting / directly editing the uploaded file
discord-announce.py announces new uploads on discord using webhooks (example)
reject-mimetype.py rejects uploads unless the mimetype is acceptable
into-the-cache-it-goes.py avoids bugs in caching proxies by immediately downloading each file that is uploaded
podcast-normalizer.py creates a second file with dynamic-range-compression whenever an audio file is uploaded
- good example of the idx hook effect to tell copyparty about additional files to scan/index

upload batches

these are --xiu hooks; unlike xbu and xau (which get executed on every single file), xiu hooks are given a list of recent uploads on STDIN after the server has gone idle for N seconds, reducing server load + providing more context

xiu.py is a "minimal" example showing a list of filenames + total filesize
xiu-sha.py produces a sha512 checksum list in the volume root

before upload

reject-extension.py rejects uploads if they match a list of file extensions
reloc-by-ext.py redirects an upload to another destination based on the file extension
- good example of the reloc hook effect
reject-and-explain.py shows a custom error-message when it rejects an upload
reject-ramdisk.py rejects the upload if the destination is a ramdisk
- this hook uses the I flag which makes it 140x faster, but if the plugin has a bug it may crash copyparty

on message

wget.py lets you download files by POSTing URLs to copyparty
- wget-i.py is an import-safe modification of this hook (starts 140x faster, but higher chance of bugs)
qbittorrent-magnet.py starts downloading a torrent if you post a magnet url
usb-eject.py adds web-UI buttons to safe-remove usb flashdrives shared through copyparty
msg-log.py is a guestbook; logs messages to a doc in the same folder

general concept demos

import-me.py shows how the I flag makes the hook 140x faster (but you need to be Very Careful when writing the plugin)
- wget-i.py is an import-safe modification of wget.py