Add bucket lifecycle expiry feature (#7834)

pkg/lifecycle/lifecycle.go

@@ -21,6 +21,7 @@ import (
 	"errors"
 	"io"
 	"strings"
+	"time"
 )
 
 var (
@@ -29,6 +30,17 @@ var (
 	errLifecycleOverlappingPrefix = errors.New("Lifecycle configuration has rules with overlapping prefix")
 )
 
+// Action represents a delete action or other transition
+// actions that will be implemented later.
+type Action int
+
+const (
+	// NoneAction means no action required after evaluting lifecycle rules
+	NoneAction Action = iota
+	// DeleteAction means the object needs to be removed after evaluting lifecycle rules
+	DeleteAction
+)
+
 // Lifecycle - Configuration for bucket lifecycle.
 type Lifecycle struct {
 	XMLName xml.Name `xml:"LifecycleConfiguration"`
@@ -84,3 +96,35 @@ func (lc Lifecycle) Validate() error {
 	}
 	return nil
 }
+
+// FilterRuleActions returns the expiration and transition from the object name
+// after evaluating all rules.
+func (lc Lifecycle) FilterRuleActions(objName string) (Expiration, Transition) {
+	for _, rule := range lc.Rules {
+		if strings.ToLower(rule.Status) != "enabled" {
+			continue
+		}
+		if strings.HasPrefix(objName, rule.Filter.Prefix) {
+			return rule.Expiration, Transition{}
+		}
+	}
+	return Expiration{}, Transition{}
+}
+
+// ComputeAction returns the action to perform by evaluating all lifecycle rules
+// against the object name and its modification time.
+func (lc Lifecycle) ComputeAction(objName string, modTime time.Time) Action {
+	var action = NoneAction
+	exp, _ := lc.FilterRuleActions(objName)
+	if !exp.IsDateNull() {
+		if time.Now().After(exp.Date.Time) {
+			action = DeleteAction
+		}
+	}
+	if !exp.IsDaysNull() {
+		if time.Now().After(modTime.Add(time.Duration(exp.Days) * 24 * time.Hour)) {
+			action = DeleteAction
+		}
+	}
+	return action
+}