Google API 请求令牌时刷新令牌是 None

Question

我已按照以下指南为我的应用程序获取 Google 广告 API 刷新令牌。

https://github.com/googleads/googleads-python-lib/wiki/API-access-on-behalf-of-your-clients-(web-flow)

使用下面的脚本，一切正常，但响应只有一个访问令牌，而刷新令牌是 None。

from googleads import oauth2
import google.oauth2.credentials
import google_auth_oauthlib.flow


# Initialize the flow using the client ID and secret downloaded earlier.
# Note: You can use the GetAPIScope helper function to retrieve the
# appropriate scope for AdWords or Ad Manager.
flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
    'client_secret.json',
    [oauth2.GetAPIScope('adwords')])
# Indicate where the API server will redirect the user after the user completes
# the authorization flow. The redirect URI is required.
flow.redirect_uri = 'https://www.example.com'

# Generate URL for request to Google's OAuth 2.0 server.
# Use kwargs to set optional request parameters.
authorization_url, state = flow.authorization_url(
    # Enable offline access so that you can refresh an access token without
    # re-prompting the user for permission. Recommended for web server apps.
    access_type='offline',
    # Enable incremental authorization. Recommended as a best practice.
    include_granted_scopes='true',
    # approval_prompt='force'
)
print("\n" + authorization_url)
print("\nVisit the above URL and grant access. You will be redirected. Get the 'code' from the query params of the redirect URL.")

auth_code = input('\nCode: ').strip()

flow.fetch_token(code=auth_code)
credentials = flow.credentials
print(credentials.__dict__)

Answer 1

问题似乎是我之前已经完成了这些步骤。

解决方案是将 approval_prompt='force' 包含在 flow.authorization_url() 中。以这种方式生成 authorization_url 后，响应也包含一个刷新令牌。