如何在AppEngine上使用Appengine的OpenID和facebook OAuth混合进行身份验证？

pip install google-auth google-auth-oauthlib google-auth-httplib2 requests requests-oauthlib

from google.auth.transport import requests
from google.oauth2 import id_token
from google.auth.transport.requests import Request
from google_auth_oauthlib.flow import Flow
from google.oauth2.credentials import Credentials
from google.auth import crypt
from google.auth import jwt
from google.auth import transport
from google.auth.transport.requests import Request
from google.oauth2 import service_account
import requests
from requests_oauthlib import OAuth2Session

# 配置应用程序
client_id = 'your_client_id'
client_secret = 'your_client_secret'
redirect_uri = 'your_redirect_uri'
openid_provider = 'your_openid_provider_url'
facebook_provider = 'your_facebook_provider_url'

# 实现OpenID身份验证
def authenticate_openid(request):
    authorization_url, state = Flow.from_client_config(
        {
            'web': {
                'client_id': client_id,
                'client_secret': client_secret,
                'redirect_uris': [redirect_uri],
                'auth_uri': openid_provider,
                'token_uri': openid_provider,
                'issuer': openid_provider,
            }
        },
        scopes=['openid', 'email', 'profile'],
    ).authorization_url(request_uri=redirect_uri)

    # 跳转到授权页面
    return redirect(authorization_url[0])

# 实现Facebook OAuth身份验证
def authenticate_facebook(request):
    facebook = OAuth2Session(client_id, redirect_uri=redirect_uri)
    authorization_url, state = facebook.authorization_url(facebook_provider)

    # 跳转到授权页面
    return redirect(authorization_url)

# 处理回调请求
def handle_callback(request):
    # 处理OpenID回调请求
    if 'code' in request.args:
        flow = Flow.from_client_config(
            {
                'web': {
                    'client_id': client_id,
                    'client_secret': client_secret,
                    'redirect_uris': [redirect_uri],
                    'auth_uri': openid_provider,
                    'token_uri': openid_provider,
                    'issuer': openid_provider,
                }
            },
            scopes=['openid', 'email', 'profile'],
            state=request.args['state'],
        )
        credentials = flow.fetch_token(Request())
        id_info = id_token.verify_oauth2_token(credentials.id_token, Request())

        # 处理Facebook回调请求
    elif 'oauth_token' in request.args:
        facebook = OAuth2Session(client_id, state=request.args['state'])
        token = facebook.fetch_token(facebook_provider, client_secret=client_secret, authorization_response=request.url)
        id_info = facebook.get('https://graph.facebook.com/me?fields=id,name,email').json()

    # 处理身份验证成功后的逻辑
    # ...