1 // godlighty -- highly-customizable HTTP, HTTP/2, HTTPS server
2 // Copyright (C) 2021-2024 Sergey Matveev <stargrave@stargrave.org>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, version 3 of the License.
8 // This program is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program. If not, see <http://www.gnu.org/licenses/>.
23 "golang.org/x/sys/unix"
26 func ctimeETag(fd *os.File) (string, error) {
28 err := unix.Fstat(int(fd.Fd()), &stat)
32 sec, nsec := stat.Ctim.Unix()
33 buf := make([]byte, 8*2)
34 binary.BigEndian.PutUint64(buf[:8], uint64(sec))
35 binary.BigEndian.PutUint64(buf[8:], uint64(nsec))
36 return `"` + base64.RawURLEncoding.EncodeToString(buf) + `"`, nil