如何获取Firebase Cloud Messaging的OAuth2.0令牌

Question

我已经设置了我的网络应用程序以接收Firebase Cloud Messages，但为了发送它们，我理解我需要一个OAuth2.0令牌，该令牌是从我的服务帐户私钥生成的。我已经下载并安装了Google API Client Library for Python中的密钥。这是我的代码：

from oauth2client import *
def _get_access_token():
  """Retrieve a valid access token that can be used to authorize requests.

  :return: Access token.
  """
  credentials = ServiceAccountCredentials.from_json_keyfile_name(
      'service-account.json', FCM_SCOPE)
  access_token_info = credentials.get_access_token()
  return access_token_info.access_token

_get_access_token()

当我运行它时，我得到

Traceback (most recent call last):
  File "get-oauth-token.py", line 11, in <module>
    _get_access_token()
  File "get-oauth-token.py", line 7, in _get_access_token
    credentials = ServiceAccountCredentials.from_json_keyfile_name(
NameError: name 'ServiceAccountCredentials' is not defined

我猜测是缺少了某个import，但具体是哪个我不确定。

- user8207330

---

从oauth2client.service_account导入ServiceAccountCredentials。但是 FCM_SCOPE 我不知道。 - jiamo

Answer 1

以下内容可能会解决您的问题：

from oauth2client.service_account import ServiceAccountCredentials
fsm_scope = 'https://www.googleapis.com/auth/firebase.messaging'

def _get_access_token():
    """Retrieve a valid access token that can be used to authorize requests.

    :return: Access token.
    """
    credentials = ServiceAccountCredentials.from_json_keyfile_name(
        'service-account.json', fsm_scope)
    access_token_info = credentials.get_access_token()
    return access_token_info.access_token

_get_access_token()

- jiamo

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@jiamo 你知道如何在.Net或JavaScript中实现这个吗？ - Daniel Jackson

有没有类似的 Perl 解决方案？ - procra