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namecheapProvider.go
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/
namecheapProvider.go
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package namecheap
import (
"encoding/json"
"fmt"
"sort"
"strings"
"time"
"golang.org/x/net/publicsuffix"
"github.com/StackExchange/dnscontrol/models"
"github.com/StackExchange/dnscontrol/pkg/printer"
"github.com/StackExchange/dnscontrol/providers"
"github.com/StackExchange/dnscontrol/providers/diff"
nc "github.com/billputer/go-namecheap"
"github.com/pkg/errors"
)
// NamecheapDefaultNs lists the default nameservers for this provider.
var NamecheapDefaultNs = []string{"dns1.registrar-servers.com", "dns2.registrar-servers.com"}
// Namecheap is the handle for this provider.
type Namecheap struct {
ApiKey string
ApiUser string
client *nc.Client
}
var features = providers.DocumentationNotes{
providers.CanUseAlias: providers.Cannot(),
providers.CanUseCAA: providers.Cannot(),
providers.CanUsePTR: providers.Cannot(),
providers.CanUseSRV: providers.Cannot("The namecheap web console allows you to make SRV records, but their api does not let you read or set them"),
providers.CanUseTLSA: providers.Cannot(),
providers.CantUseNOPURGE: providers.Cannot(),
providers.DocCreateDomains: providers.Cannot("Requires domain registered through their service"),
providers.DocDualHost: providers.Cannot("Doesn't allow control of apex NS records"),
providers.DocOfficiallySupported: providers.Cannot(),
}
func init() {
providers.RegisterRegistrarType("NAMECHEAP", newReg)
providers.RegisterDomainServiceProviderType("NAMECHEAP", newDsp, features)
providers.RegisterCustomRecordType("URL", "NAMECHEAP", "")
providers.RegisterCustomRecordType("URL301", "NAMECHEAP", "")
providers.RegisterCustomRecordType("FRAME", "NAMECHEAP", "")
}
func newDsp(conf map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {
return newProvider(conf, metadata)
}
func newReg(conf map[string]string) (providers.Registrar, error) {
return newProvider(conf, nil)
}
func newProvider(m map[string]string, metadata json.RawMessage) (*Namecheap, error) {
api := &Namecheap{}
api.ApiUser, api.ApiKey = m["apiuser"], m["apikey"]
if api.ApiKey == "" || api.ApiUser == "" {
return nil, errors.Errorf("missing Namecheap apikey and apiuser")
}
api.client = nc.NewClient(api.ApiUser, api.ApiKey, api.ApiUser)
// if BaseURL is specified in creds, use that url
BaseURL, ok := m["BaseURL"]
if ok {
api.client.BaseURL = BaseURL
}
return api, nil
}
func splitDomain(domain string) (sld string, tld string) {
tld, _ = publicsuffix.PublicSuffix(domain)
d, _ := publicsuffix.EffectiveTLDPlusOne(domain)
sld = strings.Split(d, ".")[0]
return sld, tld
}
// namecheap has request limiting at unpublished limits
// from support in SEP-2017:
// "The limits for the API calls will be 20/Min, 700/Hour and 8000/Day for one user.
// If you can limit the requests within these it should be fine."
// this helper performs some api action, checks for rate limited response, and if so, enters a retry loop until it resolves
// if you are consistently hitting this, you may have success asking their support to increase your account's limits.
func doWithRetry(f func() error) {
// sleep 5 seconds at a time, up to 23 times (1 minute, 15 seconds)
const maxRetries = 23
const sleepTime = 5 * time.Second
var currentRetry int
for {
err := f()
if err == nil {
return
}
if strings.Contains(err.Error(), "Error 500000: Too many requests") {
currentRetry++
if currentRetry >= maxRetries {
return
}
printer.Printf("Namecheap rate limit exceeded. Waiting %s to retry.\n", sleepTime)
time.Sleep(sleepTime)
} else {
return
}
}
}
// GetDomainCorrections returns the corrections for the domain.
func (n *Namecheap) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
dc.Punycode()
sld, tld := splitDomain(dc.Name)
var records *nc.DomainDNSGetHostsResult
var err error
doWithRetry(func() error {
records, err = n.client.DomainsDNSGetHosts(sld, tld)
return err
})
if err != nil {
return nil, err
}
var actual []*models.RecordConfig
// namecheap does not allow setting @ NS with basic DNS
dc.Filter(func(r *models.RecordConfig) bool {
if r.Type == "NS" && r.GetLabel() == "@" {
if !strings.HasSuffix(r.GetTargetField(), "registrar-servers.com.") {
fmt.Println("\n", r.GetTargetField(), "Namecheap does not support changing apex NS records. Skipping.")
}
return false
}
return true
})
// namecheap has this really annoying feature where they add some parking records if you have no records.
// This causes a few problems for our purposes, specifically the integration tests.
// lets detect that one case and pretend it is a no-op.
if len(dc.Records) == 0 && len(records.Hosts) == 2 {
if records.Hosts[0].Type == "CNAME" &&
strings.Contains(records.Hosts[0].Address, "parkingpage") &&
records.Hosts[1].Type == "URL" {
return nil, nil
}
}
for _, r := range records.Hosts {
if r.Type == "SOA" {
continue
}
rec := &models.RecordConfig{
Type: r.Type,
TTL: uint32(r.TTL),
MxPreference: uint16(r.MXPref),
Original: r,
}
rec.SetLabel(r.Name, dc.Name)
rec.SetTarget(r.Address)
actual = append(actual, rec)
}
// Normalize
models.PostProcessRecords(actual)
differ := diff.New(dc)
_, create, delete, modify := differ.IncrementalDiff(actual)
// // because namecheap doesn't have selective create, delete, modify,
// // we bundle them all up to send at once. We *do* want to see the
// // changes though
var desc []string
for _, i := range create {
desc = append(desc, "\n"+i.String())
}
for _, i := range delete {
desc = append(desc, "\n"+i.String())
}
for _, i := range modify {
desc = append(desc, "\n"+i.String())
}
msg := fmt.Sprintf("GENERATE_ZONE: %s (%d records)%s", dc.Name, len(dc.Records), desc)
corrections := []*models.Correction{}
// only create corrections if there are changes
if len(desc) > 0 {
corrections = append(corrections,
&models.Correction{
Msg: msg,
F: func() error {
return n.generateRecords(dc)
},
})
}
return corrections, nil
}
func (n *Namecheap) generateRecords(dc *models.DomainConfig) error {
var recs []nc.DomainDNSHost
id := 1
for _, r := range dc.Records {
rec := nc.DomainDNSHost{
ID: id,
Name: r.GetLabel(),
Type: r.Type,
Address: r.GetTargetField(),
MXPref: int(r.MxPreference),
TTL: int(r.TTL),
}
recs = append(recs, rec)
id++
}
sld, tld := splitDomain(dc.Name)
var err error
doWithRetry(func() error {
_, err = n.client.DomainDNSSetHosts(sld, tld, recs)
return err
})
return err
}
// GetNameservers returns the nameservers for a domain.
func (n *Namecheap) GetNameservers(domainName string) ([]*models.Nameserver, error) {
// return default namecheap nameservers
ns := NamecheapDefaultNs
return models.StringsToNameservers(ns), nil
}
// GetRegistrarCorrections returns corrections to update nameservers.
func (n *Namecheap) GetRegistrarCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
var info *nc.DomainInfo
var err error
doWithRetry(func() error {
info, err = n.client.DomainGetInfo(dc.Name)
return err
})
if err != nil {
return nil, err
}
sort.Strings(info.DNSDetails.Nameservers)
found := strings.Join(info.DNSDetails.Nameservers, ",")
desiredNs := []string{}
for _, d := range dc.Nameservers {
desiredNs = append(desiredNs, d.Name)
}
sort.Strings(desiredNs)
desired := strings.Join(desiredNs, ",")
if found != desired {
parts := strings.SplitN(dc.Name, ".", 2)
sld, tld := parts[0], parts[1]
return []*models.Correction{
{
Msg: fmt.Sprintf("Change Nameservers from '%s' to '%s'", found, desired),
F: func() (err error) {
doWithRetry(func() error {
_, err = n.client.DomainDNSSetCustom(sld, tld, desired)
return err
})
return
}},
}, nil
}
return nil, nil
}