blob: bbe0e3260d7347f0da82d0834bd77ee9cf3f76e7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// This file contains code derived from https://github.com/golang/go/blob/master/src/net/http/fs.go
//
// Copyright 2020 GitLab Inc. All rights reserved.
// Copyright 2009 The Go Authors. All rights reserved.
package imageresizer
import (
"net/http"
"time"
)
func checkNotModified(r *http.Request, modtime time.Time) bool {
ims := r.Header.Get("If-Modified-Since")
if ims == "" || isZeroTime(modtime) {
// Treat bogus times as if there was no such header at all
return false
}
t, err := http.ParseTime(ims)
if err != nil {
return false
}
// The Last-Modified header truncates sub-second precision so
// the modtime needs to be truncated too.
return !modtime.Truncate(time.Second).After(t)
}
// isZeroTime reports whether t is obviously unspecified (either zero or Unix epoch time).
func isZeroTime(t time.Time) bool {
return t.IsZero() || t.Equal(time.Unix(0, 0))
}
func setLastModified(w http.ResponseWriter, modtime time.Time) {
if !isZeroTime(modtime) {
w.Header().Set("Last-Modified", modtime.UTC().Format(http.TimeFormat))
}
}
func writeNotModified(w http.ResponseWriter) {
h := w.Header()
h.Del("Content-Type")
h.Del("Content-Length")
w.WriteHeader(http.StatusNotModified)
}
|
