# Placeholder for user database interactions class UserDatabase: def get_registration_key(self, username): # Retrieve registration key for a given user pass

# Update key in database try: self.user_database.update_registration_key(username, new_key) return "Registration key updated successfully" except Exception as e: return f"Failed to update registration key: {e}"

def update_registration_key(self, username, current_key, new_key): # Authenticate user and verify current key if not self.authenticate_user(username, current_key): return "Authentication failed"

def authenticate_user(self, username, key): # Placeholder for authentication logic stored_key = self.user_database.get_registration_key(username) return stored_key == key

# Placeholder for key validation logic class KeyValidator: def validate(self, key): # Logic to validate the key (e.g., format, hasn't been used before) return True