如何在Python中使用google.auth而不是oauth2client来访问我的Google日历

Question

几年前我创建了一个小的Python程序，它能够使用oauth2client维护我的日历，现在已经弃用并用google.auth取代 - 但我找不到任何有用的文档，我的程序停止工作抱怨_module KeyError没有人看来除了通过升级解决了。

我无法弄清楚如何用google.auth替换oauth2client：

import datetime
import httplib2
import os

from apiclient import discovery
import oauth2client
from oauth2client import client
from oauth2client import tools

...

credentials = get_credentials()
http = credentials.authorize(httplib2.Http())
service = discovery.build('calendar', 'v3', http=http)

Answer 1

根据oauth2client deprecation notes，用于管理Google用户凭据的替代品是google-auth-oauthlib。在我的电脑上工作的片段（python 3.6）下面。

由于文档突出显示新库不保存凭据，这就是我使用pickle保存它们的原因。也许，根据您的应用程序要求，您希望拥有更强大的解决方案（如数据库）。

import os
import pickle

from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

SCOPES = ['https://www.googleapis.com/auth/calendar.readonly', ]


# we check if the file to store the credentials exists
if not os.path.exists('credentials.dat'):

    flow = InstalledAppFlow.from_client_secrets_file('client_id.json', SCOPES)
    credentials = flow.run_local_server()

    with open('credentials.dat', 'wb') as credentials_dat:
        pickle.dump(credentials, credentials_dat)
else:
    with open('credentials.dat', 'rb') as credentials_dat:
        credentials = pickle.load(credentials_dat)

if credentials.expired:
    credentials.refresh(Request())

calendar_sdk = build('calendar', 'v3', credentials=credentials)

calendars_get_params = {
        'calendarId': 'primary',
    }

test = calendar_sdk.calendars().get(**calendars_get_params).execute()
print(test)

Answer 2

我没有对此进行过有力的测试，但它适用于使用我的个人帐户测试代码段。我确信可以和/或应该对企业应用程序进行更改，例如传递auth'd Http()实例，检测范围更改等等。

您可以查看my GitHub repo上的完整代码：

要求：

• 谷歌的API的Python客户端
• 谷歌-AUTH
• 谷歌认证 - oauthlib
• 无论上面提到了什么

我使用InstalledAppFlow类，并且通常遵循Google's Python auth guide上的说明。

代码（Python 3.6）

# Google API imports
from googleapiclient.discovery import build
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow

SCOPES = ['your scopes', 'here']

def get_saved_credentials(filename='creds.json'):
    '''Read in any saved OAuth data/tokens
    '''
    fileData = {}
    try:
        with open(filename, 'r') as file:
            fileData: dict = json.load(file)
    except FileNotFoundError:
        return None
    if fileData and 'refresh_token' in fileData and 'client_id' in fileData and 'client_secret' in fileData:
        return Credentials(**fileData)
    return None

def store_creds(credentials, filename='creds.json'):
    if not isinstance(credentials, Credentials):
        return
    fileData = {'refresh_token': credentials.refresh_token,
                'token': credentials.token,
                'client_id': credentials.client_id,
                'client_secret': credentials.client_secret,
                'token_uri': credentials.token_uri}
    with open(filename, 'w') as file:
        json.dump(fileData, file)
    print(f'Credentials serialized to {filename}.')

def get_credentials_via_oauth(filename='client_secret.json', scopes=SCOPES, saveData=True) -> Credentials:
    '''Use data in the given filename to get oauth data
    '''
    iaflow: InstalledAppFlow = InstalledAppFlow.from_client_secrets_file(filename, scopes)
    iaflow.run_local_server()
    if saveData:
        store_creds(iaflow.credentials)
    return iaflow.credentials

def get_service(credentials, service='sheets', version='v4'):
    return build(service, version, credentials=credentials)

用法是：

creds = get_saved_credentials()
if not creds:
    creds = get_credentials_via_oauth()
sheets = get_service(creds)