How to Build a Simple ActivityPub Reminder Bot in Python

This post guides you through building a simple ActivityPub bot in Python using the `apkit` library. The bot listens for mentions and schedules reminders for users. It covers setting up the project, generating cryptographic keys for secure communication, defining the bot's identity as an ActivityPub Actor, and initializing the `apkit` server. The tutorial walks through the core logic for parsing reminder commands, sending notifications, and defining necessary web endpoints like `/actor` and `/inbox`. It also details how to handle incoming activities, such as `Follow` and `Create` events, and how to run the application using `uvicorn`. While the example uses in-memory storage for simplicity, the post suggests improvements like persistent storage and robust task queuing for production environments. This tutorial provides a solid foundation for building more complex ActivityPub applications.