is voter missing

utils.py

@@ -155,6 +155,19 @@ def is_show_results(form):
     return form['show_results']
 
 
+def is_voter(key, token):
+    if token == None:
+        return False
+    cur = g.db.cursor()
+    cur.execute(
+        "SELECT token FROM tokens WHERE token = ? AND question_set = ? AND role = 'voter'",
+        (
+            get_hash(token),
+            key
+        )
+    )
+    return len(cur.fetchall()) > 0
+
 def parse_form(key):
     form = {
         'expires': None,