def parse_url(url):
    scheme, loc, path, query, frag = urlsplit(url)
    if scheme != "ss":
        return None
    secret, addr = loc.split("@")
    if ":" not in secret:
        secret = base64.urlsafe_b64decode(secret)
    cipher, key = secret.split(":")
    host, port = addr.split(":")
    frag = unquote(frag)
    return host, port, cipher, key, frag