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go_helpers/http/nolistfs.go

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package http
import (
"net/http"
"os"
"github.com/pkg/errors"
)
type (
// NoListFS wraps an http.FileSystem and ensures no directory
// listings are printed out in order not to expose the contents
// of the directory in a listing.
NoListFS struct{ Next http.FileSystem }
)
var _ http.FileSystem = NoListFS{}
// Open wraps the Open of the inner http.FileSystem and returns an
// os.ErrNotExist in case a directory should be opened. This will
// result in a HTTP 404 when trying to open a directory causing the
// contents to be conceiled in an effective manner (zero exposure
// of known paths)
func (n NoListFS) Open(name string) (http.File, error) {
f, err := n.Next.Open(name)
if err != nil {
return f, errors.Wrap(err, "opening file from inner fs")
}
info, err := f.Stat()
if err != nil {
f.Close()
return nil, errors.Wrap(err, "getting stat from opened file")
}
if info.IsDir() {
f.Close()
return nil, errors.Wrap(os.ErrNotExist, "refusing to open a directory")
}
return f, nil
}