merge object lifecycle checks into usage crawler (#9579)

pkg/bucket/lifecycle/lifecycle.go

@@ -33,6 +33,8 @@ var (
 // actions that will be implemented later.
 type Action int
 
+//go:generate stringer -type Action $GOFILE
+
 const (
 	// NoneAction means no action required after evaluting lifecycle rules
 	NoneAction Action = iota
@@ -46,9 +48,44 @@ type Lifecycle struct {
 	Rules   []Rule   `xml:"Rule"`
 }
 
-// IsEmpty - returns whether policy is empty or not.
-func (lc Lifecycle) IsEmpty() bool {
-	return len(lc.Rules) == 0
+// HasActiveRules - returns whether policy has active rules for.
+// Optionally a prefix can be supplied.
+// If recursive is specified the function will also return true if any level below the
+// prefix has active rules. If no prefix is specified recursive is effectively true.
+func (lc Lifecycle) HasActiveRules(prefix string, recursive bool) bool {
+	if len(lc.Rules) == 0 {
+		return false
+	}
+	for _, rule := range lc.Rules {
+		if rule.Status == Disabled {
+			continue
+		}
+		if len(prefix) > 0 && len(rule.Filter.Prefix) > 0 {
+			// incoming prefix must be in rule prefix
+			if !recursive && !strings.HasPrefix(prefix, rule.Filter.Prefix) {
+				continue
+			}
+			// If recursive, we can skip this rule if it doesn't match the tested prefix.
+			if recursive && !strings.HasPrefix(rule.Filter.Prefix, prefix) {
+				continue
+			}
+		}
+
+		if rule.NoncurrentVersionExpiration.NoncurrentDays > 0 {
+			return true
+		}
+		if rule.NoncurrentVersionTransition.NoncurrentDays > 0 {
+			return true
+		}
+		if rule.Expiration.IsNull() {
+			continue
+		}
+		if !rule.Expiration.IsDateNull() && rule.Expiration.Date.After(time.Now()) {
+			continue
+		}
+		return true
+	}
+	return false
 }
 
 // ParseLifecycleConfig - parses data in given reader to Lifecycle.