insom / pubb

A little ActivityPub guy in Flask

Pubb

Little! Python! ActivityPub!

This is a small Flask ActivityPub server which will only expose one username on a given domain, and which accepts every follow request it gets. Then you can use some of its library to send ActivityPub messages (there's an example of DMing with an image, which was a use-case I wrote this for).

Inspired by https://github.com/sfomuseum/go-activitypub and https://shkspr.mobi/blog/2024/04/the-fediverse-of-things/ but actually using the PHP from https://shkspr.mobi/blog/2024/02/activitypub-server-in-a-single-file/ as more of a reference than the Go code.

I found that most ActivityPub libraries are pretty abstract and I wanted something that was scrappy and understandable, like Terence Eden's single PHP file. But also not in PHP.

Generate an RSA key pair

openssl genrsa > private.key
openssl rsa -pubout < private.key > public.key

Configure

cat > config.ini <<EOF
USERNAME='something'
HOSTNAME='something.somethingelse'
ICON='https://somewhere/summut.png'
EOF

Run

flask run -h 0.0.0.0