从云函数到应用引擎的请求返回错误401

Question

我正在尝试从云功能向部署在默认GAE服务上的几个应用引擎端点发送请求。我的代码很简单:

云功能

main.py

import logging
import requests
def main(event, context):
bucketname = event['bucket']
filename = event['name']
endpoint = # Some logic extracting the endpoint to be used
url = 'https://myproject.ew.r.appspot.com/{}'.format(endpoint)
data = {
'bucketname': bucketname,
'filename': filename
}
r = requests.post(url, json=data)
logging.info(r)
return str(r)

Cloud Function部署了:

gcloud functions deploy storage_to_gae --runtime python37 --trigger-resource $BUCKETNAME --trigger-event google.storage.object.finalize --region $REGION --source gcf/ --entry-point main --service-account [e-mail]

功能使用的业务帐户具有"业务帐户用户(roles/iam.serviceAccountUser)"角色。

App Engine

app.yml

runtime: python37
service: default

但是，请求没有到达App Engine，因为GAE服务上没有出现日志。请求返回一个<Response [401]>错误代码，所以CF似乎无法到达应用引擎服务。

我的[e-mail]服务帐户还需要哪些角色?我在客户端环境中部署，所以我的权限有限，我必须请求所需的确切角色。

Answer 1

在询问我的客户的GCP团队后，他们使用IAP来管理访问。

我按照本文档中的说明进行操作，并且能够向GAE端点发送请求。

这是我的最终代码:

import requests
from google.oauth2 import id_token
from google.auth.transport.requests import Request
def make_iap_request(url, client_id, method='POST', **kwargs):
"""Makes a request to an application protected by Identity-Aware Proxy.
Args:
url: The Identity-Aware Proxy-protected URL to fetch.
client_id: The client ID used by Identity-Aware Proxy.
method: The request method to use
('GET', 'OPTIONS', 'HEAD', 'POST', 'PUT', 'PATCH', 'DELETE')
**kwargs: Any of the parameters defined for the request function:
https://github.com/requests/requests/blob/master/requests/api.py
If no timeout is provided, it is set to 90 by default.
Returns:
The page body, or raises an exception if the page couldn't be retrieved.
"""
# Set the default timeout, if missing
if 'timeout' not in kwargs:
kwargs['timeout'] = 90
# Obtain an OpenID Connect (OIDC) token from metadata server or using service
# account.
open_id_connect_token = id_token.fetch_id_token(Request(), client_id)
# Fetch the Identity-Aware Proxy-protected URL, including an
# Authorization header containing "Bearer " followed by a
# Google-issued OpenID Connect token for the service account.
resp = requests.request(
method, url,
headers={'Authorization': 'Bearer {}'.format(
open_id_connect_token)}, **kwargs)

return resp.text
def main(event, context):
bucketname = event['bucket']
filename = event['name']
endpoint = # Some logic extracting the endpoint to be used
url = 'https://myproject.ew.r.appspot.com/{}'.format(endpoint)
data = {
'bucketname': bucketname,
'filename': filename
}
client_id = 'myclientid'
r = make_iap_request(url, client_id, 'POST', json=data)
logging.info(r)
return str(r)