使用oauth2client创建google api凭据（从具有范围和委托帐户的服务帐户）

Question

为了访问GMail API(并将呼叫拟人化)，我使用了一个服务帐户(从谷歌云平台创建)。我的json文件看起来像这样

{
"type": "service_account",
"project_id": "[PROJECT-ID]",
"private_key_id": "[KEY-ID]"
"private_key": "-----BEGIN PRIVATE KEY-----\n[PRIVATE-KEY]\n-----END PRIVATE KEY-----\n",
"client_email": "[SERVICE-ACCOUNT-EMAIL]",
"client_id": "[CLIENT-ID]",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://accounts.google.com/o/oauth2/token",
"auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
"client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/[SERVICE-ACCOUNT-EMAIL]"
}

我还使用oAuth2client库使其更容易，但我找不到创建凭据然后指定范围和委托帐户的方法。

我试过了

from oauth2client import service_account

self._credentials = service_account.ServiceAccountCredentials.from_json(SERVICE_ACCOUNT_JSON_CONTENT)
self._credentials = self._credentials.create_scoped([u'https://www.googleapis.com/auth/gmail.send'])
self._credentials = self._credentials.create_delegated(MY_USER)
        self._client = discovery.build(u'gmail', u'v1', credentials=self._credentials)

但是我得到了一个错误，因为它需要一个PKCS-8密钥。

我该怎么做？（如果有帮助，我的代码在应用程序引擎 Flex 上运行）

谢啦

Answer 1

最后，由于 oauth2client 现在已被弃用，转而使用谷歌身份验证，因此我确实

from googleapiclient import discovery
from google.oauth2.service_account import Credentials

credentials = Credentials.from_service_account_file(PATH_TO_SERVICE_ACCOUNT_JSON,
                                                                  scopes=[u'https://www.googleapis.com/auth/gmail.send'])
delegated_credentials = self._credentials.with_subject(MY_USER)
client = discovery.build(u'gmail', u'v1', credentials=delegated_credentials)

它成功了。-)