from django.conf import settings


def get_setting(prefix: str, key: str, default=None):
    """
    Reads a setting with a given app prefix dict.

    Example:
        get_setting("INFRASYNTH_SECURITY", "COOKIE_SECURE", True)
    Looks up settings.INFRASYNTH_SECURITY["COOKIE_SECURE"] with fallback to default.
    """
    config = getattr(settings, prefix, {})
    return config.get(key, default)