add 'delete etherpad cookie', optimize the 'checkPadExists' function

fet2020/authentications/views.py

@@ -5,6 +5,7 @@ from django.contrib.auth.models import User
 
 from .authentications import authentication
 from .decorators import unauthenticated_user, authenticated_user
+from documents.etherpadlib import del_ep_cookie
 
 
 @unauthenticated_user
@@ -33,4 +34,8 @@ def loginPage(request):
 @authenticated_user
 def logoutUser(request):
     logout(request)
-    return redirect('home')
+
+    response = redirect('home')
+    response = del_ep_cookie(request, response)
+
+    return response