```
def base64_url_encode(text):
    return base64.b64encode(text).replace('+', '-').replace('/', '_').replace('=', '')


def base64_url_decode(text):
    text = text.replace('-', '+').replace('_', '/')
    while True:
        try:
            result = base64.b64decode(text)
        except TypeError:
            text += '='
        else:
            break
    return result
```