chore: update golang version

vendor/github.com/gin-gonic/gin/fs.go

@@ -0,0 +1,45 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"net/http"
+	"os"
+)
+
+type onlyfilesFS struct {
+	fs http.FileSystem
+}
+
+type neuteredReaddirFile struct {
+	http.File
+}
+
+// Dir returns a http.Filesystem that can be used by http.FileServer(). It is used internally
+// in router.Static().
+// if listDirectory == true, then it works the same as http.Dir() otherwise it returns
+// a filesystem that prevents http.FileServer() to list the directory files.
+func Dir(root string, listDirectory bool) http.FileSystem {
+	fs := http.Dir(root)
+	if listDirectory {
+		return fs
+	}
+	return &onlyfilesFS{fs}
+}
+
+// Open conforms to http.Filesystem.
+func (fs onlyfilesFS) Open(name string) (http.File, error) {
+	f, err := fs.fs.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return neuteredReaddirFile{f}, nil
+}
+
+// Readdir overrides the http.File default implementation.
+func (f neuteredReaddirFile) Readdir(count int) ([]os.FileInfo, error) {
+	// this disables directory listing
+	return nil, nil
+}