policy to trigger requiring payment

server-ca/policy.py

@@ -15,7 +15,12 @@ r = redis.Redis()
 
 def payment_required(session):
     """Does this session require a payment?"""
-    return False
+    # Sample policy: require a payment when total number of requested
+    # subject names is greater than one.
+    if r.llen("%s:names" % session) > 1:
+        return True
+    else:
+        return False
 
 def expire_session(session, state):
     """Should this session be expired?"""