#! python3

from urllib.parse import quote_plus


def create_aws_relay_state(idp, target):
    '''
    Provided an identity provider url as a string and a target url as string,
    we will create an ADFS relay state. I don't know why we need to run the
    quote_plus funciton twice, other than we need to re-encode all of the %
    symbols a second time.
    '''
    rpi = quote_plus(quote_plus('urn:amazon:webservices'))
    encoded_target = quote_plus(quote_plus(target))

    relay_state = idp + '?RelayState=RPID%3D' + rpi + '%26RelayState%3D' + encoded_target

    return relay_state