docker_get_token.py

#! /usr/bin/python3
# -*- coding: utf-8 -*-

import requests


def get_token(auth_url, image_name):
    payload = {
        'service': 'registry.docker.io',
        'scope': 'repository:library/{image}:pull'.format(image=image_name)
    }

    r = requests.get(auth_url + '/token', params=payload)
    if not r.status_code == 200:
        print("Error status {}".format(r.status_code))
        raise Exception("Could not get auth token")

    j = r.json()
    return j['token']


token = get_token('https://auth.docker.io', 'openjdk')
print(token)