Question

from google.oauth2 import service_account
import googleapiclient.discovery

SCOPES = ['https://www.googleapis.com/auth/calendar']
SERVICE_ACCOUNT_FILE = 'GOOGLE_SECRET.json'

credentials = service_account.Credentials.from_service_account_file(
        SERVICE_ACCOUNT_FILE, scopes=SCOPES)

delegated_credentials = credentials.with_subject('address@example.com')

google_calendar = googleapiclient.discovery.build('calendar', 'v3', credentials=delegated_credentials)

events = google_calendar.events().list(
    calendarId='address@example.com',
    maxResults=10
).execute()

上述代码的结果是：

google.auth.exceptions.RefreshError: ('unauthorized_client: Client is unauthorized to retrieve access tokens using this method.', '{\n  "error" : "unauthorized_client",\n  "error_description" : "Client is unauthorized to retrieve access tokens using this method."\n}')

Domain-wide delegation已开启。服务帐户客户端ID已在GSuite中使用适当的范围进行授权。

服务帐户适用于普通凭据。它仅适用于委派凭据。

我在我们的域中尝试过不同的API（范围）和不同的用户。

我让一位同事尝试从头开始编写样本，他得到了同样的东西。

Answer 1

我认为您的问题在于，您在拨打Calendar API之前未授权您的凭据，但您在我自己的实施中使用了一些差异

使用以下导入语句from oauth2client.service_account import ServiceAccountCredentials和from apiclient import discovery
使用from_json_keyfile_name方法
授权凭据并在构建服务时将其作为http参数传递

尝试对您的代码进行此修改：

from apiclient import discovery
from oauth2client.service_account import ServiceAccountCredentials
import httplib2

SCOPES = ['https://www.googleapis.com/auth/calendar']
SERVICE_ACCOUNT_FILE = 'GOOGLE_SECRET.json'

credentials = ServiceAccountCredentials.from_json_keyfile_name(
        SERVICE_ACCOUNT_FILE, scopes=SCOPES)

# Use the create_delegated() method and authorize the delegated credentials
delegated_credentials = credentials.create_delegated('address@example.com')  
delegated_http = delegated_credentials.authorize(httplib2.Http())
google_calendar = discovery.build('calendar', 'v3', http=delegated_http)

events = google_calendar.events().list(
    calendarId='address@example.com',
    maxResults=10
).execute()

我还建议您在API调用中设置calendarId='primary'，以便始终返回您当前为其委派凭据的用户的主日历。

有关使用ServiceAccountCredentials进行身份验证的详细信息，请参阅以下链接：http://oauth2client.readthedocs.io/en/latest/source/oauth2client.service_account.html

Google服务帐户无法冒充GSuite用户

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