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gcloudProvider.go
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gcloudProvider.go
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package google
import (
"context"
"encoding/json"
"fmt"
"strings"
gauth "golang.org/x/oauth2/google"
gdns "google.golang.org/api/dns/v1"
"github.com/StackExchange/dnscontrol/v2/models"
"github.com/StackExchange/dnscontrol/v2/pkg/diff"
"github.com/StackExchange/dnscontrol/v2/providers"
)
var features = providers.DocumentationNotes{
providers.DocCreateDomains: providers.Can(),
providers.DocDualHost: providers.Can(),
providers.DocOfficiallySupported: providers.Can(),
providers.CanUsePTR: providers.Can(),
providers.CanUseSRV: providers.Can(),
providers.CanUseCAA: providers.Can(),
providers.CanUseTXTMulti: providers.Can(),
providers.CanGetZones: providers.Can(),
}
func sPtr(s string) *string {
return &s
}
func init() {
providers.RegisterDomainServiceProviderType("GCLOUD", New, features)
}
type gcloud struct {
client *gdns.Service
project string
nameServerSet *string
zones map[string]*gdns.ManagedZone
}
type errNoExist struct {
domain string
}
func (e errNoExist) Error() string {
return fmt.Sprintf("Domain '%s' not found in gcloud account", e.domain)
}
// New creates a new gcloud provider
func New(cfg map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {
// the key as downloaded is json encoded with literal "\n" instead of newlines.
// in some cases (round-tripping through env vars) this tends to get messed up.
// fix it if we find that.
if key, ok := cfg["private_key"]; ok {
cfg["private_key"] = strings.Replace(key, "\\n", "\n", -1)
}
raw, err := json.Marshal(cfg)
if err != nil {
return nil, err
}
config, err := gauth.JWTConfigFromJSON(raw, "https://www.googleapis.com/auth/ndev.clouddns.readwrite")
if err != nil {
return nil, err
}
ctx := context.Background()
hc := config.Client(ctx)
dcli, err := gdns.New(hc)
if err != nil {
return nil, err
}
var nss *string = nil
if val, ok := cfg["name_server_set"]; ok {
fmt.Printf("GCLOUD :name_server_set %s configured\n", val)
nss = sPtr(val)
}
g := &gcloud{
client: dcli,
nameServerSet: nss,
project: cfg["project_id"],
}
return g, g.loadZoneInfo()
}
func (g *gcloud) loadZoneInfo() error {
if g.zones != nil {
return nil
}
g.zones = map[string]*gdns.ManagedZone{}
pageToken := ""
for {
resp, err := g.client.ManagedZones.List(g.project).PageToken(pageToken).Do()
if err != nil {
return err
}
for _, z := range resp.ManagedZones {
g.zones[z.DnsName] = z
}
if pageToken = resp.NextPageToken; pageToken == "" {
break
}
}
return nil
}
// ListZones returns the list of zones (domains) in this account.
func (g *gcloud) ListZones() ([]string, error) {
var zones []string
for i := range g.zones {
zones = append(zones, strings.TrimSuffix(i, "."))
}
return zones, nil
}
func (g *gcloud) getZone(domain string) (*gdns.ManagedZone, error) {
return g.zones[domain+"."], nil
}
func (g *gcloud) GetNameservers(domain string) ([]*models.Nameserver, error) {
zone, err := g.getZone(domain)
if err != nil {
return nil, err
}
return models.ToNameserversStripTD(zone.NameServers)
}
type key struct {
Type string
Name string
}
func keyFor(r *gdns.ResourceRecordSet) key {
return key{Type: r.Type, Name: r.Name}
}
func keyForRec(r *models.RecordConfig) key {
return key{Type: r.Type, Name: r.GetLabelFQDN() + "."}
}
// GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
func (g *gcloud) GetZoneRecords(domain string) (models.Records, error) {
existingRecords, _, _, err := g.getZoneSets(domain)
return existingRecords, err
}
func (g *gcloud) getZoneSets(domain string) (models.Records, map[key]*gdns.ResourceRecordSet, string, error) {
rrs, zoneName, err := g.getRecords(domain)
if err != nil {
return nil, nil, "", err
}
// convert to dnscontrol RecordConfig format
existingRecords := []*models.RecordConfig{}
oldRRs := map[key]*gdns.ResourceRecordSet{}
for _, set := range rrs {
oldRRs[keyFor(set)] = set
for _, rec := range set.Rrdatas {
existingRecords = append(existingRecords, nativeToRecord(set, rec, domain))
}
}
return existingRecords, oldRRs, zoneName, err
}
func (g *gcloud) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
if err := dc.Punycode(); err != nil {
return nil, err
}
existingRecords, oldRRs, zoneName, err := g.getZoneSets(dc.Name)
if err != nil {
return nil, err
}
// Normalize
models.PostProcessRecords(existingRecords)
// first collect keys that have changed
differ := diff.New(dc)
_, create, delete, modify := differ.IncrementalDiff(existingRecords)
changedKeys := map[key]bool{}
desc := ""
for _, c := range create {
desc += fmt.Sprintln(c)
changedKeys[keyForRec(c.Desired)] = true
}
for _, d := range delete {
desc += fmt.Sprintln(d)
changedKeys[keyForRec(d.Existing)] = true
}
for _, m := range modify {
desc += fmt.Sprintln(m)
changedKeys[keyForRec(m.Existing)] = true
}
if len(changedKeys) == 0 {
return nil, nil
}
chg := &gdns.Change{Kind: "dns#change"}
for ck := range changedKeys {
// remove old version (if present)
if old, ok := oldRRs[ck]; ok {
chg.Deletions = append(chg.Deletions, old)
}
// collect records to replace with
newRRs := &gdns.ResourceRecordSet{
Name: ck.Name,
Type: ck.Type,
Kind: "dns#resourceRecordSet",
}
for _, r := range dc.Records {
if keyForRec(r) == ck {
newRRs.Rrdatas = append(newRRs.Rrdatas, r.GetTargetCombined())
newRRs.Ttl = int64(r.TTL)
}
}
if len(newRRs.Rrdatas) > 0 {
chg.Additions = append(chg.Additions, newRRs)
}
}
runChange := func() error {
_, err := g.client.Changes.Create(g.project, zoneName, chg).Do()
return err
}
return []*models.Correction{{
Msg: desc,
F: runChange,
}}, nil
}
func nativeToRecord(set *gdns.ResourceRecordSet, rec, origin string) *models.RecordConfig {
r := &models.RecordConfig{}
r.SetLabelFromFQDN(set.Name, origin)
r.TTL = uint32(set.Ttl)
if err := r.PopulateFromString(set.Type, rec, origin); err != nil {
panic(fmt.Errorf("unparsable record received from GCLOUD: %w", err))
}
return r
}
func (g *gcloud) getRecords(domain string) ([]*gdns.ResourceRecordSet, string, error) {
zone, err := g.getZone(domain)
if err != nil {
return nil, "", err
}
pageToken := ""
sets := []*gdns.ResourceRecordSet{}
for {
call := g.client.ResourceRecordSets.List(g.project, zone.Name)
if pageToken != "" {
call = call.PageToken(pageToken)
}
resp, err := call.Do()
if err != nil {
return nil, "", err
}
for _, rrs := range resp.Rrsets {
if rrs.Type == "SOA" {
continue
}
sets = append(sets, rrs)
}
if pageToken = resp.NextPageToken; pageToken == "" {
break
}
}
return sets, zone.Name, nil
}
func (g *gcloud) EnsureDomainExists(domain string) error {
z, err := g.getZone(domain)
if err != nil {
if _, ok := err.(errNoExist); !ok {
return err
}
}
if z != nil {
return nil
}
var mz *gdns.ManagedZone
if g.nameServerSet != nil {
fmt.Printf("Adding zone for %s to gcloud account with name_server_set %s\n", domain, *g.nameServerSet)
mz = &gdns.ManagedZone{
DnsName: domain + ".",
NameServerSet: *g.nameServerSet,
Name: "zone-" + strings.Replace(domain, ".", "-", -1),
Description: "zone added by dnscontrol",
}
} else {
fmt.Printf("Adding zone for %s to gcloud account \n", domain)
mz = &gdns.ManagedZone{
DnsName: domain + ".",
Name: "zone-" + strings.Replace(domain, ".", "-", -1),
Description: "zone added by dnscontrol",
}
}
g.zones = nil // reset cache
_, err = g.client.ManagedZones.Create(g.project, mz).Do()
return err
}