[#583] Fix list-buckets vhs routing

The problem is that with VHS requests,
the list-buckets operation does not work
because the request is filtered on list-objects-v1.

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

api/router_filter.go

@@ -138,13 +138,17 @@ func (hf *HandlerFilters) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (hf *HandlerFilters) match(r *http.Request) http.Handler {
+	queries := r.URL.Query()
+
 LOOP:
 	for _, filter := range hf.filters {
-		if filter.noQueries && len(r.URL.Query()) > 0 {
+		if filter.noQueries && len(queries) > 0 {
 			continue
 		}
 		if len(filter.allowedQueries) > 0 {
-			queries := r.URL.Query()
+			if len(queries) == 0 {
+				continue
+			}
 			for key := range queries {
 				if _, ok := filter.allowedQueries[key]; !ok {
 					continue LOOP
@@ -158,8 +162,8 @@ LOOP:
 			}
 		}
 		for _, query := range filter.queries {
-			queryVal := r.URL.Query().Get(query.Key)
+			queryVal := queries.Get(query.Key)
-			if !r.URL.Query().Has(query.Key) || query.Value != "" && query.Value != queryVal {
+			if !queries.Has(query.Key) || query.Value != "" && query.Value != queryVal {
 				continue LOOP
 			}
 		}