Google OAUTH using django get access token - oauth

Question

I'm struggling to retrieve access token using django.
I want to get access token from users using oAuth.
This is what I have setup so far.
class GoogleExhangeViewSet(viewsets.ViewSet):
queryset = User.objects.all()
#list_route(
methods=["GET"])
def auth(self,request,pk=None):
client_id = ''
client_secret = ''
flow = OAuth2WebServerFlow(client_id=client_id,
client_secret=client_secret,
scope='https://www.googleapis.com/auth/calendar',
redirect_uri='http://localhost:8001/api/googleAuth/complete')
auth_uri = flow.step1_get_authorize_url()
return HttpResponseRedirect(auth_uri)
def complete(self, request, pk=None):
client_id = ''
client_secret = ''
host = Site.objects.get_current().name
flow = OAuth2WebServerFlow(client_id=client_id,
client_secret=client_secret,
scope='https://www.googleapis.com/auth/calendar',
redirect_uri='http://localhost')
credentials = flow.step2_exchange(request.GET.get('code'))
return Response(status=200,data=credentials.access_token)
under urls.py I have
api_router.register(r'api/googleAuth', GoogleExhangeViewSet)
This is the error I get with the following code

Answer 1

As seen in your error, you are encountering a redirect_uri_mismatchBad Request if you are using a wrong redirect uri. From this link, the redirect_uri_mismatch will be thrown if it was not matched between auth and token requests.
Additional references:
Google oAuth2 redirect_uri_mismatch in token access
Google OAuth 2.0 redirect_uri_mismatch error
Here's a tutorial if you want to use an Access Token to authenticate users against Django’s authentication system.
You need a fully-functional OAuth2 provider which is able to release access tokens: just follow the steps in the part 1 of the tutorial. To enable OAuth2 token authentication you need a middleware that checks for tokens inside requests and a custom authentication backend which takes care of token verification.