app.py

import gradio as gr

def greet(request: gr.Request):
    if request.username:
        return f"Hello {request.username}\! You are logged in."
    return "Please log in using the button above."

with gr.Blocks() as demo:
    gr.LoginButton()
    m = gr.Markdown()
    demo.load(greet, None, m)

demo.launch()