Add GuardDuty detectors (#625)

* Add GuardDuty detectors

* Include review suggestions

resources/guardduty.go

@@ -0,0 +1,55 @@
+package resources
+
+import (
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/guardduty"
+	"github.com/rebuy-de/aws-nuke/pkg/types"
+)
+
+type GuardDutyDetector struct {
+	svc *guardduty.GuardDuty
+	id  *string
+}
+
+func init() {
+	register("GuardDutyDetector", ListGuardDutyDetectors)
+}
+
+func ListGuardDutyDetectors(sess *session.Session) ([]Resource, error) {
+	svc := guardduty.New(sess)
+
+	detectors := make([]Resource, 0)
+
+	params := &guardduty.ListDetectorsInput{}
+
+	err := svc.ListDetectorsPages(params, func(page *guardduty.ListDetectorsOutput, lastPage bool) bool {
+		for _, out := range page.DetectorIds {
+			detectors = append(detectors, &GuardDutyDetector{
+				svc: svc,
+				id:  out,
+			})
+		}
+		return true
+	})
+	if err != nil {
+		return nil, err
+	}
+	return detectors, nil
+}
+
+func (detector *GuardDutyDetector) Remove() error {
+	_, err := detector.svc.DeleteDetector(&guardduty.DeleteDetectorInput{
+		DetectorId: detector.id,
+	})
+	return err
+}
+
+func (detector *GuardDutyDetector) Properties() types.Properties {
+	properties := types.NewProperties()
+	properties.Set("DetectorID", detector.id)
+	return properties
+}
+
+func (detector *GuardDutyDetector) String() string {
+	return *detector.id
+}