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package admin
import (
"fmt"
"net/http"
"strings"
"github.com/bosssauce/ponzu/system/db"
)
// CacheControl sets the default cache policy on static asset responses
func CacheControl(next http.Handler) http.Handler {
return http.HandlerFunc(func(res http.ResponseWriter, req *http.Request) {
etag := db.ConfigCache("etag")
policy := fmt.Sprintf("max-age=%d, public, must-revalidate, proxy-revalidate", 60*60*24*30)
res.Header().Add("Etag", etag)
res.Header().Add("Cache-Control", policy)
if match := res.Header().Get("If-None-Match"); match != "" {
if strings.Contains(match, etag) {
res.WriteHeader(http.StatusNotModified)
return
}
}
next.ServeHTTP(res, req)
})
}
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