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|
package httptoo
import (
"fmt"
"strings"
"time"
)
type Visibility int
const (
Default = 0
Public = 1
Private = 2
)
type CacheControlHeader struct {
MaxAge time.Duration
Caching Visibility
NoStore bool
}
func (me *CacheControlHeader) caching() []string {
switch me.Caching {
case Public:
return []string{"public"}
case Private:
return []string{"private"}
default:
return nil
}
}
func (me *CacheControlHeader) maxAge() []string {
if me.MaxAge == 0 {
return nil
}
d := me.MaxAge
if d < 0 {
d = 0
}
return []string{fmt.Sprintf("max-age=%d", d/time.Second)}
}
func (me *CacheControlHeader) noStore() []string {
if me.NoStore {
return []string{"no-store"}
}
return nil
}
func (me *CacheControlHeader) concat(sss ...[]string) (ret []string) {
for _, ss := range sss {
ret = append(ret, ss...)
}
return
}
func (me CacheControlHeader) String() string {
return strings.Join(me.concat(me.caching(), me.maxAge()), ", ")
}
|
