docker_get_image_info.py

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

import datetime
import json
from urllib.parse import urlencode
from urllib.request import Request, urlopen


class DockerImageInfo(object):
    def __init__(self, name: str, full_size: int, identifier: int, repository: int, creator: int, last_updater: int,
                 last_updated: str):
        self.name = name
        self.full_size = full_size
        self.identifier = identifier
        self.repository = repository
        self.creator = creator
        self.last_updater = last_updater
        if last_updated:
            self.last_updated = datetime.datetime.strptime(last_updated, '%Y-%m-%dT%H:%M:%S.%fZ')
        else:
            self.last_updated = None

    def __repr__(self):
        return '%s "%s" (%s bytes) @ %s by %s' % (self.identifier, self.name, self.full_size, self.last_updated,
                                                  self.last_updater)


# Step 1: Get access token
login_url = 'https://hub.docker.com/v2/users/login/'
login_post_data = {'username': 'geberl', 'password': 'supers3cret'}
request = Request(login_url, urlencode(login_post_data).encode())
data = urlopen(request).read()
data_dict = json.loads(data.decode())
token = data_dict['token']
# print(token)

# Step 2: Get all tags of an image
# image_url = 'https://hub.docker.com/v2/repositories/jenkins/jenkins/tags/'  # url for 3rd party image
image_url = 'https://hub.docker.com/v2/repositories/library/registry/tags/'  # url for docker-maintained image
all_images = []
while True:
    request = Request(image_url)
    request.add_header('Authorization', 'JWT %s' % token)
    data = urlopen(request).read()
    data_dict = json.loads(data.decode())

    for image in data_dict['results']:
        # Hash is not available, just ID.
        all_images.append(DockerImageInfo(name=image['name'], full_size=image['full_size'], identifier=image['id'],
                                          repository=image['repository'], creator=image['creator'],
                                          last_updater=image['last_updater'], last_updated=image['last_updated']))

    if data_dict['next']:
        image_url = data_dict['next']
    else:
        break

print(len(all_images))

for image in all_images:
    print(image)

print('---')

# Step 3: Get info about one specific image
# Doesn't contain any more info than the "all tags of an image" request before, is just way shorter
# image_tag_url = 'https://hub.docker.com/v2/repositories/library/openjdk/tags/8-jre/'
image_tag_url = 'https://hub.docker.com/v2/repositories/library/registry/tags/latest'
request = Request(image_tag_url)
request.add_header('Authorization', 'JWT %s' % token)
data = urlopen(request).read()
data_dict = json.loads(data.decode())
print('Name: %s' % data_dict['name'])
print('Size: %s bytes' % data_dict['full_size'])
print('Last updated: %s' % data_dict['last_updated'])