From 84488182a23cdb0edf1a713f91d76f61c281efc4 Mon Sep 17 00:00:00 2001
From: Umputun <umputun@gmail.com>
Date: Mon, 21 Jan 2019 16:52:49 -0600
Subject: [PATCH] avloid tokenization if lister failed or an empty list of
 restricted words #237

---
 backend/app/store/service/restricted_words.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/backend/app/store/service/restricted_words.go b/backend/app/store/service/restricted_words.go
index 7d33e4eb..82ee08a2 100644
--- a/backend/app/store/service/restricted_words.go
+++ b/backend/app/store/service/restricted_words.go
@@ -34,14 +34,16 @@ func NewRestrictedWordsMatcher(lister RestrictedWordsLister) *RestrictedWordsMat
 
 // Match matches comment text against restricted words for specified site
 func (m *RestrictedWordsMatcher) Match(siteID string, text string) bool {
-	tokens := m.tokenize(text)
-
 	restrictedWords, err := m.lister.List(siteID)
 	if err != nil {
 		fmt.Printf("failed to get restricted patterns for site %s: %v", siteID, err)
 		return false
 	}
+	if len(restrictedWords) == 0 {
+		return false
+	}
 
+	tokens := m.tokenize(text)
 	trie := newWildcardTrie(restrictedWords...)
 
 	for _, token := range tokens {