This is just a sample implementation of the GitHub OAuth login flow within NiceGui. I followed this documentation to learn about the flow.

1. Create an OAuth app on Github
2. Copy your CLIENT_ID, CLIENT_SECRET and CALLBACK_URL to the .env.bak file and remove the .bak extension
3. Generate some SSL Certificates (openssl req -x509 -newkey rsa:4096 -nodes -out cert.pem -keyout key .pem -days 365)
4. Start the appliction with python3 app.py

You need to provide SSL certificates using Uvicorn or a Traefik reverse Proxy, as GitHub does not allow insecure callback URLs with HTTP.