84 lines
2.8 KiB
Python
84 lines
2.8 KiB
Python
# MIT licensed
|
|
# Copyright (c) 2020 Chih-Hsuan Yen <yan12125 at gmail dot com>
|
|
|
|
from typing import Dict, List, NamedTuple, Optional, Tuple
|
|
from urllib.request import parse_http_list
|
|
|
|
from nvchecker.api import session, HTTPError
|
|
|
|
class AuthInfo(NamedTuple):
|
|
service: Optional[str]
|
|
realm: str
|
|
|
|
def parse_www_authenticate_header(header: str) -> Tuple[str, Dict[str, str]]:
|
|
'''
|
|
Parse WWW-Authenticate header used in OAuth2 authentication for container
|
|
registries. This is NOT RFC-compliant!
|
|
|
|
Simplified from http.parse_www_authenticate_header in Werkzeug (BSD license)
|
|
'''
|
|
auth_type, auth_info = header.split(None, 1)
|
|
result = {}
|
|
for item in parse_http_list(auth_info):
|
|
name, value = item.split("=", 1)
|
|
if value[:1] == value[-1:] == '"':
|
|
value = value[1:-1]
|
|
result[name] = value
|
|
return auth_type, result
|
|
|
|
# Inspired by https://stackoverflow.com/a/51921869
|
|
# Reference: https://github.com/containers/image/blob/v5.6.0/docker/docker_client.go
|
|
|
|
class UnsupportedAuthenticationError(NotImplementedError):
|
|
def __init__(self):
|
|
super().__init__('Only Bearer authentication supported for now')
|
|
|
|
async def get_registry_auth_info(registry_host: str) -> AuthInfo:
|
|
auth_service = auth_realm = None
|
|
|
|
try:
|
|
await session.get(f'https://{registry_host}/v2/')
|
|
raise UnsupportedAuthenticationError # No authentication needed
|
|
except HTTPError as e:
|
|
if e.code != 401:
|
|
raise
|
|
|
|
auth_type, auth_info = parse_www_authenticate_header(e.response.headers['WWW-Authenticate'])
|
|
if auth_type.lower() != 'bearer':
|
|
raise UnsupportedAuthenticationError
|
|
|
|
# Although 'service' is needed as per https://docs.docker.com/registry/spec/auth/token/,
|
|
# ghcr.io (GitHub container registry) does not provide it
|
|
auth_service = auth_info.get('service')
|
|
auth_realm = auth_info['realm']
|
|
|
|
return AuthInfo(auth_service, auth_realm)
|
|
|
|
async def get_container_tags(info: Tuple[str, str, AuthInfo]) -> List[str]:
|
|
image_path, registry_host, auth_info = info
|
|
|
|
auth_params = {
|
|
'scope': f'repository:{image_path}:pull',
|
|
}
|
|
if auth_info.service:
|
|
auth_params['service'] = auth_info.service
|
|
res = await session.get(auth_info.realm, params=auth_params)
|
|
token = res.json()['token']
|
|
|
|
res = await session.get(f'https://{registry_host}/v2/{image_path}/tags/list', headers={
|
|
'Authorization': f'Bearer {token}',
|
|
'Accept': 'application/json',
|
|
})
|
|
return res.json()['tags']
|
|
|
|
async def get_version(name, conf, *, cache, **kwargs):
|
|
image_path = conf.get('container', name)
|
|
registry_host = conf.get('registry', 'docker.io')
|
|
if registry_host == 'docker.io':
|
|
registry_host = 'registry-1.docker.io'
|
|
|
|
auth_info = await cache.get(registry_host, get_registry_auth_info)
|
|
|
|
key = image_path, registry_host, auth_info
|
|
return await cache.get(key, get_container_tags)
|