Excerpt of logout flow

backends.py

class LogoutMixin:
    def logout_params(self, next_page):
        # Backend should provide this
        return {
            'logout_uri': next_page
        }

    def logout_baseurl(self):
        # Backend should provide this
        return '/logout'

    def logout_url(self, next_page):
        params = self.logout_params(next_page)
        return '{0}?{1}'.format(self.logout_baseurl(), urlencode(params))
      

class CognitoNIH(CognitoProviderOAuth2, LogoutMixin):

    # ... excerpt from class ...
    
    def logout_params(self, next_page):
        # Cognito's Logout ENDPOINT does not logout of NIH Login.
        # So, we rewrite the next_page URL to be NIH login's with
        # AppReturnUrl set to the next_page.
        client_id, client_secret = self.get_key_and_secret()
        nih_logout_url = self.DOMAIN_TO_NIHLOGOUT.get(self.user_pool_domain())
        if nih_logout_url:
            next_page = '{}?AppReturnUrl={}'.format(nih_logout_url, next_page)
        return {
            'client_id': client_id,
            'logout_uri': next_page
        }

    def logout_baseurl(self):
        return '{}/logout'.format(self.user_pool_domain())

views.py

class LogoutCBV(LogoutView):

    # ... some details omitted ...

    def dispatch(self, request, *args, **kwargs):
        backend = self.get_backend()
        auth_logout(request)
        if backend and hasattr(backend, 'logout_url'):
            next_page = self.get_next_page()
            if not next_page:
                LOG.info('No LOGOUT_REDIRECT_URL or next: falling back to /')
                next_page = '/'
            if next_page.startswith('/'):
                next_page = request.build_absolute_uri(next_page)
            logout_url = backend.logout_url(next_page)
            return HttpResponseRedirect(logout_url)
        return super().dispatch(request, *args, **kwargs)