xero oauth2 with django

xero_oath2_django.py

import os

from functools import wraps
from django.urls import reverse
from django.shortcuts import redirect

from xero_python.api_client import ApiClient, serialize
from xero_python.api_client.configuration import Configuration
from xero_python.api_client.oauth2 import OAuth2Token

from requests_oauthlib import OAuth2Session
from authlib.integrations.django_client import OAuth, token_update
from django.core.cache import cache
from django.http import HttpResponse
from django.dispatch import receiver

#for dev
os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"
oauth = OAuth()
xero = oauth.register(
    name="xero",
    version="2",
    client_id="client_id",
    client_secret="client_secret",
    endpoint_url="https://api.xero.com/",
    authorization_url="https://login.xero.com/identity/connect/authorize",
    access_token_url="https://identity.xero.com/connect/token",
    refresh_token_url="https://identity.xero.com/connect/token",
    scope="offline_access openid profile email accounting.transactions "
    "accounting.transactions.read accounting.reports.read "
    "accounting.journals.read accounting.settings accounting.settings.read "
    "accounting.contacts accounting.contacts.read accounting.attachments "
    "accounting.attachments.read assets projects"
)

api_client = ApiClient(
    Configuration(
        debug=True,  # app.config["DEBUG"],
        oauth2_token=OAuth2Token(
            client_id="client_id", client_secret="client_secret"
        ),
    ),
    pool_threads=1,
)


def login(request):
    redirect_uri = request.build_absolute_uri('authorise/')
    return oauth.xero.authorize_redirect(request, redirect_uri)

def oauth_callback(request):
    try:
        token = oauth.xero.authorize_access_token(request)
    except Exception as e:
        print(e)
        raise
    if token is None:
        return HttpResponse("Access Denied")
    store_xero_oauth2_token(token)

    return redirect('/backend/tenants/')


def logout():
    store_xero_oauth2_token(None)
    return redirect('/')


def xero_token_required(function):
    @wraps(function)
    def decorator(*args, **kwargs):
        xero_token = obtain_xero_oauth2_token()
        time = datetime.datetime.now().timestamp()
        if time > xero_token['expires_at']:
            new_token = oauth.xero.fetch_access_token(
                refresh_token=xero_token['refresh_token'],
                grant_type='refresh_token')
            store_xero_oauth2_token(new_token)
            xero_token = new_token

        if not xero_token:
            return redirect(reverse("oauth"))

        return function(*args, **kwargs)

    return decorator

@api_client.oauth2_token_getter
def obtain_xero_oauth2_token():
    return cache.get('token')


@api_client.oauth2_token_saver
def store_xero_oauth2_token(token):
    cache.set('token', token, None)