Implemented CAS_RETRY_LOGIN

README.txt

@@ -55,6 +55,8 @@ Optional settings include:
       won't log the user out of CAS as well.
     * `CAS_REDIRECT_URL`: Where to send a user after logging in or out if
       there is no referrer and no next page set. Default is `/`.
+    * `CAS_RETRY_LOGIN`: If `True` and an unknown or invalid ticket is
+      received, the user is redirected back to the login page.
     * `CAS_VERSION`: The CAS protocol version to use. `'1'` and `'2'` are
       supported, with `'2'` being the default.
 

django_cas/__init__.py

@@ -10,6 +10,7 @@ _DEFAULTS = {
     'CAS_IGNORE_REFERER': False,
     'CAS_LOGOUT_COMPLETELY': True,
     'CAS_REDIRECT_URL': '/',
+    'CAS_RETRY_LOGIN': False,
     'CAS_SERVER_URL': None,
     'CAS_VERSION': '2',
 }

django_cas/views.py

@@ -62,7 +62,7 @@ def _logout_url(request, next_page=None):
     return url
 
 
-def login(request, next_page=None):
+def login(request, next_page=None, required=False):
     """Forwards to CAS login URL or verifies CAS ticket"""
 
     if not next_page:
@@ -82,6 +82,8 @@ def login(request, next_page=None):
             message = "Login succeeded. Welcome, %s." % name
             user.message_set.create(message=message)
             return HttpResponseRedirect(next_page)
+        elif settings.CAS_RETRY_LOGIN or required:
+            return HttpResponseRedirect(_login_url(service))
         else:
             error = "<h1>Forbidden</h1><p>Login failed.</p>"
             return HttpResponseForbidden(error)