decode amazon links

from base64 import b64decode
from urllib.parse import urlparse, unquote


def parse_query(query):
    return dict(item.split("=", maxsplit=1) for item in unquote(query).split("&"))


def query(url):
    query = urlparse(url).query
    result = parse_query(query)
    # if spLa exists, it's a base64 encoded string
    # decoding it and creating a sub-dict of it
    if "spLa" in result:
        result["spLa"] = parse_query(b64decode(result["spLa"]))

    return result