app.py

import gradio as gr

def greet(name):
    return "Hello " + name + "!!"


def hello(profile: gr.OAuthProfile | None) -> str:
    if profile is None:
        return "I don't know you."
    iface = gr.Interface(fn=greet, inputs="text", outputs="text")
    iface.launch()
    return f"Hello {profile.name}"


with gr.Blocks() as demo:
    gr.LoginButton()
    gr.LogoutButton()
    gr.Markdown().attach_load_event(hello, None)

demo.launch()