forked from openshift/hive
/
aws.go
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/
aws.go
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package nameserver
import (
"strings"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/route53"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
awsclient "github.com/openshift/hive/pkg/awsclient"
"github.com/openshift/hive/pkg/constants"
controllerutils "github.com/openshift/hive/pkg/controller/utils"
)
// NewAWSQuery creates a new name server query for AWS.
func NewAWSQuery(c client.Client, credsSecretName string, region string) Query {
return &awsQuery{
getAWSClient: func() (awsclient.Client, error) {
awsClient, err := awsclient.NewClient(c, credsSecretName, constants.HiveNamespace, region)
return awsClient, errors.Wrap(err, "error creating AWS client")
},
}
}
type awsQuery struct {
getAWSClient func() (awsclient.Client, error)
}
var _ Query = (*awsQuery)(nil)
// Get implements Query.Get.
func (q *awsQuery) Get(domain string) (map[string]sets.String, error) {
awsClient, err := q.getAWSClient()
if err != nil {
return nil, errors.Wrap(err, "failed to get AWS client")
}
zoneID, err := q.queryZoneID(awsClient, domain)
if err != nil {
return nil, errors.Wrap(err, "error querying zone ID")
}
if zoneID == nil {
return nil, nil
}
currentNameServers, err := q.queryNameServers(awsClient, *zoneID)
return currentNameServers, errors.Wrap(err, "error querying name servers")
}
// Create implements Query.Create.
func (q *awsQuery) Create(rootDomain string, domain string, values sets.String) error {
awsClient, err := q.getAWSClient()
if err != nil {
return errors.Wrap(err, "failed to get AWS client")
}
zoneID, err := q.queryZoneID(awsClient, rootDomain)
if err != nil {
return errors.Wrap(err, "error querying zone ID")
}
if zoneID == nil {
return errors.New("no public hosted zone found for domain")
}
return errors.Wrap(
q.changeNameServers(awsClient, *zoneID, domain, values, route53.ChangeActionUpsert),
"error creating the name server",
)
}
// Delete implements Query.Delete.
func (q *awsQuery) Delete(rootDomain string, domain string, values sets.String) error {
awsClient, err := q.getAWSClient()
if err != nil {
return errors.Wrap(err, "failed to get AWS client")
}
zoneID, err := q.queryZoneID(awsClient, rootDomain)
if err != nil {
return errors.Wrap(err, "error querying zone ID")
}
if zoneID == nil {
return nil
}
if len(values) != 0 {
// If values were provided for the name servers, attempt to perform a
// delete using those values.
err = q.changeNameServers(awsClient, *zoneID, domain, values, route53.ChangeActionDelete)
awsErr, ok := err.(awserr.Error)
if !ok || awsErr.Code() != route53.ErrCodeInvalidChangeBatch {
return errors.Wrap(err, "error deleting the name server")
}
if strings.HasSuffix(awsErr.Message(), "not found]") {
return nil
}
if !strings.HasSuffix(awsErr.Message(), "not match the current values]") {
return errors.Wrap(err, "error deleting the name server")
}
}
// Since we do not have up-to-date values for the name servers, we need
// to query AWS for the current values to use them in the delete.
values, err = q.queryNameServer(awsClient, *zoneID, domain)
if err != nil {
return errors.Wrap(err, "error querying the current values of the name server")
}
if len(values) == 0 {
return nil
}
return errors.Wrap(
q.changeNameServers(awsClient, *zoneID, domain, values, route53.ChangeActionDelete),
"error deleting the name server with recently read values",
)
}
// queryZoneID queries AWS for the public hosted zone for the specified domain.
func (q *awsQuery) queryZoneID(awsClient awsclient.Client, domain string) (*string, error) {
maxItems := "5"
domain = controllerutils.Dotted(domain)
listInput := &route53.ListHostedZonesByNameInput{
DNSName: &domain,
MaxItems: &maxItems,
}
for {
listOutput, err := awsClient.ListHostedZonesByName(listInput)
if err != nil {
return nil, err
}
for _, zone := range listOutput.HostedZones {
if zone == nil || zone.Name == nil || *zone.Name != domain {
return nil, nil
}
if zone.Config == nil || zone.Config.PrivateZone == nil || *zone.Config.PrivateZone {
continue
}
return zone.Id, nil
}
if listOutput.IsTruncated == nil || !*listOutput.IsTruncated {
return nil, nil
}
listInput.DNSName = listOutput.NextDNSName
listInput.HostedZoneId = listOutput.NextHostedZoneId
}
}
// queryNameServers queries AWS for the name servers in the specified hosted zone.
func (q *awsQuery) queryNameServers(awsClient awsclient.Client, hostedZoneID string) (map[string]sets.String, error) {
nameServers := map[string]sets.String{}
maxItems := "100"
listInput := &route53.ListResourceRecordSetsInput{
HostedZoneId: &hostedZoneID,
MaxItems: &maxItems,
}
for {
listOutput, err := awsClient.ListResourceRecordSets(listInput)
if err != nil {
return nil, err
}
for _, recordSet := range listOutput.ResourceRecordSets {
if recordSet.Name == nil {
continue
}
if recordSet.Type == nil || *recordSet.Type != route53.RRTypeNs {
continue
}
values := sets.NewString()
for _, record := range recordSet.ResourceRecords {
values.Insert(*record.Value)
}
nameServers[controllerutils.Undotted(*recordSet.Name)] = values
}
if listOutput.IsTruncated == nil || !*listOutput.IsTruncated {
return nameServers, nil
}
listInput.StartRecordIdentifier = listOutput.NextRecordIdentifier
listInput.StartRecordName = listOutput.NextRecordName
listInput.StartRecordType = listOutput.NextRecordType
}
}
// queryNameServer queries AWS for the name servers in the specified hosted zone for the specified domain.
func (q *awsQuery) queryNameServer(awsClient awsclient.Client, hostedZoneID string, domain string) (sets.String, error) {
maxItems := "1"
recordType := route53.RRTypeNs
listOutput, err := awsClient.ListResourceRecordSets(&route53.ListResourceRecordSetsInput{
HostedZoneId: &hostedZoneID,
MaxItems: &maxItems,
StartRecordName: &domain,
StartRecordType: &recordType,
})
if err != nil {
return nil, err
}
if len(listOutput.ResourceRecordSets) == 0 {
return nil, nil
}
recordSet := listOutput.ResourceRecordSets[0]
if recordSet.Name == nil {
return nil, nil
}
if controllerutils.Undotted(*recordSet.Name) != domain {
return nil, nil
}
if recordSet.Type == nil || *recordSet.Type != route53.RRTypeNs {
return nil, nil
}
values := sets.NewString()
for _, record := range recordSet.ResourceRecords {
values.Insert(*record.Value)
}
return values, nil
}
// changeNameServers changes the name servers for the specified domain in the specified hosted zone.
func (q *awsQuery) changeNameServers(awsClient awsclient.Client, hostedZoneID string, domain string, values sets.String, action string) error {
recordType := route53.RRTypeNs
ttl := int64(60)
records := make([]*route53.ResourceRecord, 0, len(values))
for v := range values {
value := v
records = append(records, &route53.ResourceRecord{Value: &value})
}
changeInput := &route53.ChangeResourceRecordSetsInput{
HostedZoneId: &hostedZoneID,
ChangeBatch: &route53.ChangeBatch{
Changes: []*route53.Change{{
Action: &action,
ResourceRecordSet: &route53.ResourceRecordSet{
Name: &domain,
Type: &recordType,
TTL: &ttl,
ResourceRecords: records,
},
}},
},
}
_, err := awsClient.ChangeResourceRecordSets(changeInput)
return err
}