SSO: Use Login and Logout view classes instead of methods

- Closes #965

Signed-off-by: Joseph Nuthalpati <njoseph@thoughtworks.com>

Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/sso/urls.py

@@ -20,10 +20,10 @@ URLs for the Single Sign On module.
 
 from django.conf.urls import url
 
-from .views import login, refresh
+from .views import SSOLoginView, refresh
 from stronghold.decorators import public
 
 urlpatterns = [
-    url(r'^accounts/sso/login/$', public(login), name='sso-login'),
+    url(r'^accounts/sso/login/$', public(SSOLoginView.as_view()), name='sso-login'),
     url(r'^accounts/sso/refresh/$', refresh, name='sso-refresh'),
 ]

plinth/modules/sso/views.py

@@ -26,8 +26,7 @@ from plinth import actions
 from django.http import HttpResponseRedirect
 from django.contrib.auth import REDIRECT_FIELD_NAME
 from django.contrib.auth.decorators import login_required
-from django.contrib.auth.views import (login as auth_login, logout as
-                                       auth_logout)
+from django.contrib.auth.views import LoginView, LogoutView
 
 PRIVATE_KEY_FILE_NAME = 'privkey.pem'
 SSO_COOKIE_NAME = 'auth_pubtkt'
@@ -48,21 +47,31 @@ def set_ticket_cookie(user, response):
     return response
 
 
-def login(request):
-    """Login to Plinth and set a auth_pubtkt cookie which will be
+class SSOLoginView(LoginView):
+    """View to login to Plinth and set a auth_pubtkt cookie which will be
     used to provide Single Sign On for some other applications
     """
-    response = auth_login(
-        request, template_name='login.html', redirect_authenticated_user=True)
-    return set_ticket_cookie(
-        request.user, response) if request.user.is_authenticated else response
+
+    redirect_authenticated_user = True
+    template_name = 'login.html'
+
+    def dispatch(self, request, *args, **kwargs):
+        response = super(SSOLoginView, self).dispatch(request, *args, **kwargs)
+        return set_ticket_cookie(
+            request.user,
+            response) if request.user.is_authenticated else response
 
 
-def logout(request, next_page):
-    """Log out of Plinth and remove auth_pubtkt cookie"""
-    response = auth_logout(request, next_page=next_page)
-    response.delete_cookie(SSO_COOKIE_NAME)
-    return response
+class SSOLogoutView(LogoutView):
+    """View to log out of Plinth and remove the auth_pubtkt cookie"""
+
+    template_name = 'index.html'
+
+    def dispatch(self, request, *args, **kwargs):
+        response = super(SSOLogoutView, self).dispatch(request, *args,
+                                                       **kwargs)
+        response.delete_cookie(SSO_COOKIE_NAME)
+        return response
 
 
 @login_required

plinth/modules/users/urls.py

@@ -24,10 +24,7 @@ from django.urls import reverse_lazy
 from stronghold.decorators import public
 
 from plinth.utils import non_admin_view
-from plinth.modules.sso.views import (
-    login as sso_login,
-    logout as sso_logout
-)
+from plinth.modules.sso.views import SSOLoginView, SSOLogoutView
 from . import views
 
 
@@ -42,8 +39,8 @@ urlpatterns = [
         non_admin_view(views.UserChangePassword.as_view()),
         name='change_password'),
     # Add Django's login/logout urls
-    url(r'^accounts/login/$', public(sso_login), name='login'),
-    url(r'^accounts/logout/$', public(sso_logout),
+    url(r'^accounts/login/$', public(SSOLoginView.as_view()), name='login'),
+    url(r'^accounts/logout/$', SSOLogoutView.as_view(),
         {'next_page': reverse_lazy('index')}, name='logout'),
     url(r'^users/firstboot/$', public(views.FirstBootView.as_view()),
         name='firstboot'),