From 2baa74d5204a29150767cb090937e54620ec7b83 Mon Sep 17 00:00:00 2001
From: Andrey Chervyakov <cognioandrey@gmail.com>
Date: Thu, 18 Mar 2021 23:17:18 +0600
Subject: [PATCH] Fix links retrieval handler allowing negative limit and
 offset values

---
 link/handlers.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/link/handlers.go b/link/handlers.go
index aa7c178..912372d 100644
--- a/link/handlers.go
+++ b/link/handlers.go
@@ -53,7 +53,7 @@ func allRetrievalHandler(ctx echo.Context, serv Service) error {
 	limit := 20
 	if v := ctx.QueryParam("limit"); v != "" {
 		num, err := strconv.Atoi(v)
-		if err != nil {
+		if err != nil || num < 0 {
 			return echo.NewHTTPError(http.StatusBadRequest, "Invalid limit value.")
 		}
 
@@ -63,7 +63,7 @@ func allRetrievalHandler(ctx echo.Context, serv Service) error {
 	offset := 0
 	if v := ctx.QueryParam("offset"); v != "" {
 		num, err := strconv.Atoi(v)
-		if err != nil {
+		if err != nil || num < 0 {
 			return echo.NewHTTPError(http.StatusBadRequest, "Invalid offset value.")
 		}