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#!/bin/sh
#
# Reads client secret and client token from STDIN (slightly better than as
# args, which are public), one in each line respectively.
#
# Calls into Google's OAuth2 API with that info to retrieve an access token,
# which is output to STDOUT.
#
# CLIENT_ID is the only argument taken by this script.
CLIENT_ID=$1
read -r CLIENT_SECRET
read -r REFRESH_TOKEN
curl --silent \
--data client_id=$CLIENT_ID \
--data client_secret=$CLIENT_SECRET \
--data grant_type=refresh_token \
--data refresh_token=$REFRESH_TOKEN \
'https://www.googleapis.com/oauth2/v4/token' | jq -r .access_token
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