從 Python 用戶端存取後端 API

若要從 Python 用戶端存取 Cloud Endpoints API，您必須使用 Google API Python 用戶端程式庫。 如果 API 不需任何驗證，則您的用戶端可以存取 API，如以下範例程式碼所示：

import pprint

from googleapiclient.discovery import build

def main():
  # Build a service object for interacting with the API.
  api_root = 'https://guestbook.appspot.com/_ah/api'
  api = 'guestbook'
  version = 'v0.2'
  discovery_url = '%s/discovery/v1/apis/%s/%s/rest' % (api_root, api, version)
  service = build(api, version, discoveryServiceUrl=discovery_url)

  # Fetch all greetings and print them out.
  response = service.greetings().list().execute()
  pprint.pprint(response)

  # Fetch a single greeting and print it out.
  response = service.greetings().get(id='9001').execute()
  pprint.pprint(response)

if __name__ == '__main__':
  main()

在範例程式碼中：

• api_root 是公開 API 方法的前端根網址。此網址通常為 https://YOUR_PROJECT_ID.appspot.com/_ah/api，其中 YOUR_PROJECT_ID represents your Google Cloud Platform (GCP)
• api是 API 的名稱。
• version 是後端 API 的版本。

存取需要驗證的 API

如果後端 API 需要驗證，您必須同時使用 Google API Python 用戶端程式庫和 OAuth2.0 用戶端程式庫。

您的用戶端可以使用類似以下的程式碼，取得所需的驗證並存取 API：

import argparse
import pprint
import sys

from googleapiclient import discovery
import httplib2
import oauth2client
from oauth2client import tools

CLIENT_ID = 'YOUR_CLIENT_ID'
CLIENT_SECRET = 'YOUR_CLIENT_SECRET'
SCOPE = 'https://www.googleapis.com/auth/userinfo.email'
USER_AGENT = 'my-cmdline-tool/1.0'
OAUTH_DISPLAY_NAME = 'My Commandline Tool'

def main(argv):
  # Parse command line flags used by the oauth2client library.
  parser = argparse.ArgumentParser(
      description='Auth sample',
      formatter_class=argparse.RawDescriptionHelpFormatter,
      parents=[tools.argparser])
  flags = parser.parse_args(argv[1:])

  # Acquire and store oauth token.
  storage = oauth2client.file.Storage('guestbook.dat')
  credentials = storage.get()

  if credentials is None or credentials.invalid:
    flow = oauth2client.client.OAuth2WebServerFlow(
        client_id=YOUR_CLIENT_ID,
        client_secret=YOUR_CLIENT_SECRET,
        scope=SCOPE,
        user_agent=USER_AGENT,
        oauth_displayname=OAUTH_DISPLAY_NAME)
    credentials = tools.run_flow(flow, storage, flags)
  http = httplib2.Http()
  http = credentials.authorize(http)

  # Build a service object for interacting with the API.
  api_root = 'https://guestbook.appspot.com/_ah/api'
  api = 'guestbook'
  version = 'v0.2'
  discovery_url = '%s/discovery/v1/apis/%s/%s/rest' % (api_root, api, version)
  service = discovery.build(
      api, version, discoveryServiceUrl=discovery_url, http=http)

  # Fetch all greetings and print them out.
  response = service.greetings().list().execute()
  pprint.pprint(response)

  # Fetch a single greeting and print it out.
  response = service.greetings().get(id='9001').execute()
  pprint.pprint(response)

if __name__ == '__main__':
  main(sys.argv)

請注意，SCOPE 必須以上述方式設定。如要瞭解 YOUR_CLIENT_ID 和 YOUR_CLIENT_SECRET，請參閱建立用戶端 ID。