From 49d6079f9ac4e30a15aba4df45d1c42bb64711db Mon Sep 17 00:00:00 2001
From: pyama <pyama@pepabo.com>
Date: Tue, 26 Dec 2023 17:18:29 +0900
Subject: [PATCH] fix null pattern

---
 base_limiter.go      | 2 +-
 base_limiter_test.go | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/base_limiter.go b/base_limiter.go
index 9c4a979..390b496 100644
--- a/base_limiter.go
+++ b/base_limiter.go
@@ -34,7 +34,7 @@ func NewBaseLimiter(
 	targetExtensionsMap := make(map[string]struct{}, len(targetExtensions))
 	if len(targetExtensions) > 0 {
 		for _, ext := range targetExtensions {
-			if ext[0] != '.' {
+			if len(ext) > 0 && ext[0] != '.' {
 				ext = "." + ext
 			}
 			targetExtensionsMap[strings.ToLower(ext)] = struct{}{}
diff --git a/base_limiter_test.go b/base_limiter_test.go
index 198fec6..e0e2a9f 100644
--- a/base_limiter_test.go
+++ b/base_limiter_test.go
@@ -54,6 +54,12 @@ func TestBaseLimiter_isTargetExtensions(t *testing.T) {
 			requestPath:      "/file",
 			want:             false,
 		},
+		{
+			name:             "null extention",
+			targetExtensions: []string{""},
+			requestPath:      "/file",
+			want:             true,
+		},
 	}
 
 	for _, tt := range tests {