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gui: Enable proper asset caching (#4931)

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This commit is contained in:
Audrius Butkevicius
2018-05-10 06:53:39 +01:00
committed by Jakob Borg
parent fb198a0645
commit e125f8b05b
3 changed files with 47 additions and 2 deletions
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21
cmd/syncthing/gui_statics.go
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@@ -16,6 +16,7 @@ import (
"os"
"path/filepath"
"strings"
"time"
"github.com/syncthing/syncthing/lib/auto"
"github.com/syncthing/syncthing/lib/config"
@@ -71,6 +72,8 @@ func (s *staticsServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
}
func (s *staticsServer) serveAsset(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "no-cache, must-revalidate")
file := r.URL.Path
if file[0] == '/' {
@@ -122,6 +125,24 @@ func (s *staticsServer) serveAsset(w http.ResponseWriter, r *http.Request) {
}
}
etag := fmt.Sprintf("%d", auto.Generated)
modified := time.Unix(auto.Generated, 0).UTC()
w.Header().Set("Last-Modified", modified.Format(http.TimeFormat))
w.Header().Set("Etag", etag)
if t, err := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); err == nil && modified.Add(time.Second).After(t) {
w.WriteHeader(http.StatusNotModified)
return
}
if match := r.Header.Get("If-None-Match"); match != "" {
if strings.Contains(match, etag) {
w.WriteHeader(http.StatusNotModified)
return
}
}
mtype := s.mimeTypeForFile(file)
if len(mtype) != 0 {
w.Header().Set("Content-Type", mtype)