python调用registry v2接口获取镜像Label

import requests
import www_authenticate
import urllib.parse as urlparse
from urllib.parse import urlencode
"""
本部分用于从镜像仓库获取镜像的提交信息。
提交信息通过docker镜像的label来加入镜像
调用Registry v2的api实现
参考链接:
https://docs.docker.com/registry/spec/api/
"""

auth_token = $YOUR_REGISTRY_URL
registry_url = $YOUR_AUTH_TOKEN
#  此部分从配置文件读取


def get_commit_msg(namespace, repo, tag,label):
    try:
        auth_headers = {'Authorization': f'Basic {auth_token}', 'User-Agent': 'Docker-Client/19.03.2 (linux)'}
        first_header = {"X-Docker-Token": "true"}
        s = requests.get(registry_url, headers=first_header)
        # 获取www-authenticate认证相关信息
        parsed = www_authenticate.parse(s.headers['www-authenticate'])
        if 'bearer' in parsed:
            info = parsed['bearer']
            scope = 'repository:' + f'{namespace}/{repo}' + ':' + ',*'
            # 添加scope信息,包含命名空间/仓库:操作
        url_parts = list(urlparse.urlparse(info['realm']))
        query = urlparse.parse_qs(url_parts[4])
        query.update({
            'service': info['service'],
            'scope': scope
                    })
        url_parts[4] = urlencode(query, True)
        url_parts[0] = 'https'
        auth_url = urlparse.urlunparse(url_parts)
        # 生成auth_url
        token = f"Bearer {requests.get(auth_url,headers=auth_headers).json()['token']}"
        # 通过auth_url 来获取token
        new_header = {'Authorization': token, 'Accept': 'application/vnd.docker.distribution.manifest.v2+json'}
        # 生成新的token,Accept用于简化返回信息,稍微提高效率
        metadata = requests.get(f"{registry_url}/{namespace}/{repo}/manifests/{tag}", headers=new_header)
        conf_digest = metadata.json()['config']['digest']
        label = requests.get(f"{registry_url}/{namespace}/{repo}/blobs/{conf_digest}", headers=new_header).json()
        msg = label['config']['Labels'][label]
        return msg
    except Exception as e:
        print(e)