wiki/cas: redirect only if action=login_cas

Du coup, ça faisait encore merder la suppression de PJ.

wiki/auth/cas.py

@@ -138,10 +138,6 @@ class CASAuth(BaseAuth):
                 sys.stderr.write("Tentative de deconnexion du CAS : %s\n" % logoutRequest)
                 self.cas.singlesignout(logout_user, logoutRequest)
 
-        # anonymous
-        if not ticket and not self.action == action:
-            return user_obj, True
-
         # valid ticket on CAS
         if ticket and ticket.startswith('ST-'):
             valid, username = self.cas.validate_ticket(url, ticket)
@@ -160,8 +156,9 @@ class CASAuth(BaseAuth):
                     store_ticket(ticket, username)
                     load_theme_fallback(request, u.theme_name)
                 return u, True
-
-        # login
+            else:
+                request.http_redirect(self.cas.login_url(url))
+        elif self.action == action: # Redirect login
             request.http_redirect(self.cas.login_url(url))
 
         return user_obj, True