使用服务帐户密钥的Google Drive Python API授权

Question

对于Google Cloud Platform项目，我具有以下服务帐户json凭据文件：

如何使用该服务帐户向Google Drive API进行身份验证？例如，当我尝试执行以下操作时：

from googleapiclient.discovery import build
from httplib2 import Http
from oauth2client import file, client, tools

SCOPES = 'https://www.googleapis.com/auth/drive.metadata.readonly'

flow = client.flow_from_clientsecrets('mykey.json', SCOPES)
creds = tools.run_flow(flow, store)
service = build('drive', 'v3', http=creds.authorize(Http()))

results = service.files().list(pageSize=10, fields="nextPageToken, files(id, name)").execute()
items = results.get('files', [])

运行flow命令时出现错误，抱怨密钥文件的格式不是以web或installed开头：

Invalid file format. See https://developers.google.com/api-client-library/python/guide/aaa_client_secrets
Expected a JSON object with a single property for a "web" or "installed" application 

是否可以使用以上密钥为我的Google服务帐户列出我的云端硬盘文件？如果是这样，该怎么办？

Answer 1

要使用服务帐户凭据，应从 ServiceAccountCredentials 导入 oauth2client.service_account 库并按如下方式使用：

# The needed import for service account credentials:
from oauth2client.service_account import ServiceAccountCredentials

from apiclient.discovery import build

scope = ['https://www.googleapis.com/auth/drive']

# Parsing JSON credentials for a service account:
credentials = ServiceAccountCredentials.from_json_keyfile_name('creds.json', scope)

service = build('drive', 'v3', credentials=credentials)

然后，使用 service 作为常规，例如service.files() 等

Answer 2

您可以转到以下Python Quickstart for Drive页，然后单击“启用Drive API”按钮。这将允许您下载以下行格式的凭据，除了：

flow = client.flow_from_clientsecrets('mykey.json', SCOPES)