"""Simple demo authentication for the Amazon QA chatbot."""

USERS = { "admin": {"password": "admin123", "name": "Admin User"}, "demo": {"password": "demo123", "name": "Demo User"}, "analyst": {"password": "analyst123", "name": "QA Analyst"}, }

def authenticate(username: str, password: str) -> dict | None: """Return user profile if credentials are valid, else None.""" user = USERS.get(username.strip().lower()) if user and user["password"] == password: return {"username": username.strip().lower(), "name": user["name"]} return None