Use dns.IsSubDomain (#112)

For the match function use the proper thing from go dns. Fix all
callers and tests to use this.

Fixes: #107

1 files changed, 1 insertions, 0 deletions

diff --git a/middleware/rewrite/condition.go b/middleware/rewrite/condition.go
index ddd4c38b1..3ccde21f9 100644
--- a/middleware/rewrite/condition.go
+++ b/middleware/rewrite/condition.go
@@ -76,6 +76,7 @@ func startsWithFunc(a, b string) bool {
 // endsWithFunc is condition for EndsWith operator.
 // It checks if b is a suffix of a.
 func endsWithFunc(a, b string) bool {
+	// TODO(miek): IsSubDomain
 	return strings.HasSuffix(a, b)
 }