policy.go RawHistoryFolder

1package favicon
2
3import (
4	"crypto/sha256"
5	"encoding/hex"
6	"time"
7)
8
9const DefaultTTL = 30 * 24 * time.Hour
10
11func Hash(data []byte) string {
12	sum := sha256.Sum256(data)
13	return hex.EncodeToString(sum[:])
14}
15
16func ShouldRefresh(meta *Metadata, now time.Time, ttl time.Duration) bool {
17	if meta == nil {
18		return true
19	}
20	if ttl <= 0 {
21		return true
22	}
23	return !meta.LastCheckedAt.Add(ttl).After(now)
24}
25
26func HasContentChanged(meta *Metadata, data []byte) bool {
27	if meta == nil {
28		return true
29	}
30	return meta.ContentHash != Hash(data)
31}