How to use the djangosaml2.views.logout_service function in djangosaml2

#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from django.urls import path

from . import views

urlpatterns = [
    path('login/', views.login, name='saml2_login'),
    path('acs/', views.AssertionConsumerServiceView.as_view(), name='saml2_acs'),
    path('logout/', views.logout, name='saml2_logout'),
    path('ls/', views.logout_service, name='saml2_ls'),
    path('ls/post/', views.logout_service_post, name='saml2_ls_post'),
    path('metadata/', views.metadata, name='saml2_metadata'),
]

#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import django
from django.conf.urls import handler500, url
from djangosaml2 import views

urlpatterns = [
    url(r'^login/$', views.login, name='saml2_login'),
    url(r'^acs/$', views.assertion_consumer_service, name='saml2_acs'),
    url(r'^logout/$', views.logout, name='saml2_logout'),
    url(r'^ls/$', views.logout_service, name='saml2_ls'),
    url(r'^ls/post/$', views.logout_service_post, name='saml2_ls_post'),
    url(r'^metadata/$', views.metadata, name='saml2_metadata'),
]

if django.VERSION < (1, 8):
    # django.conf.urls.patterns will be removed from django 1.10, so we
    # import it here
    from django.conf.urls import patterns
    urlpatterns = patterns('', *urlpatterns)

handler500 = handler500

__all__ = ['login', 'echo_attributes', 'assertion_consumer_service', 'metadata']


if logout_service_post is None:
  _assertion_consumer_service = assertion_consumer_service

  @require_POST
  @csrf_exempt
  def assertion_consumer_service(request, config_loader_path=None, attribute_mapping=None, create_unknown_user=None):
    username_source = libsaml.conf.USERNAME_SOURCE.get().lower()
    return _assertion_consumer_service(request, config_loader_path, attribute_mapping, create_unknown_user, username_source)


setattr(logout_service, 'login_notrequired', True)
setattr(login, 'login_notrequired', True)
setattr(echo_attributes, 'login_notrequired', True)
setattr(assertion_consumer_service, 'login_notrequired', True)
setattr(metadata, 'login_notrequired', True)

if logout_service_post is not None:
  setattr(logout_service_post, 'login_notrequired', True)

def merengue_logout_service(request):
    """Do the logout and then send a message to the user"""
    response = logout_service(request, config_loader_path='plugins.saml2.saml_config_loader.merengue_config_loader',
                              next_page='/')
    if 'SAMLResponse' in request.GET:  # we started the logout
        send_info(request, _('Thank you for your visit'))
    return response