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lego/providers/dns/oraclecloud/oraclecloud.go
2020-09-02 20:38:01 +02:00

206 lines
6.3 KiB
Go

// Package oraclecloud implements a DNS provider for solving the DNS-01 challenge using Oracle Cloud DNS.
package oraclecloud
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/oracle/oci-go-sdk/common"
"github.com/oracle/oci-go-sdk/dns"
)
// Environment variables names.
const (
envNamespace = "OCI_"
EnvCompartmentOCID = envNamespace + "COMPARTMENT_OCID"
envPrivKey = envNamespace + "PRIVKEY"
EnvPrivKeyFile = envPrivKey + "_FILE"
EnvPrivKeyPass = envPrivKey + "_PASS"
EnvTenancyOCID = envNamespace + "TENANCY_OCID"
EnvUserOCID = envNamespace + "USER_OCID"
EnvPubKeyFingerprint = envNamespace + "PUBKEY_FINGERPRINT"
EnvRegion = envNamespace + "REGION"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
CompartmentID string
OCIConfigProvider common.ConfigurationProvider
PropagationTimeout time.Duration
PollingInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, dns01.DefaultTTL),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 60*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
client *dns.DnsClient
config *Config
}
// NewDNSProvider returns a DNSProvider instance configured for OracleCloud.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(envPrivKey, EnvTenancyOCID, EnvUserOCID, EnvPubKeyFingerprint, EnvRegion, EnvCompartmentOCID)
if err != nil {
return nil, fmt.Errorf("oraclecloud: %w", err)
}
config := NewDefaultConfig()
config.CompartmentID = values[EnvCompartmentOCID]
config.OCIConfigProvider = newConfigProvider(values)
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for OracleCloud.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config == nil {
return nil, errors.New("oraclecloud: the configuration of the DNS provider is nil")
}
if config.CompartmentID == "" {
return nil, errors.New("oraclecloud: CompartmentID is missing")
}
if config.OCIConfigProvider == nil {
return nil, errors.New("oraclecloud: OCIConfigProvider is missing")
}
client, err := dns.NewDnsClientWithConfigurationProvider(config.OCIConfigProvider)
if err != nil {
return nil, fmt.Errorf("oraclecloud: %w", err)
}
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{client: &client, config: config}, nil
}
// Present creates a TXT record to fulfill the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zoneNameOrID, err1 := dns01.FindZoneByFqdn(dns01.ToFqdn(domain))
if err1 != nil {
return fmt.Errorf("oraclecloud: could not find zone for domain %q and fqdn %q : %w", domain, fqdn, err1)
}
// generate request to dns.PatchDomainRecordsRequest
recordOperation := dns.RecordOperation{
Domain: common.String(dns01.UnFqdn(fqdn)),
Rdata: common.String(value),
Rtype: common.String("TXT"),
Ttl: common.Int(d.config.TTL),
IsProtected: common.Bool(false),
}
request := dns.PatchDomainRecordsRequest{
CompartmentId: common.String(d.config.CompartmentID),
ZoneNameOrId: common.String(zoneNameOrID),
Domain: common.String(dns01.UnFqdn(fqdn)),
PatchDomainRecordsDetails: dns.PatchDomainRecordsDetails{
Items: []dns.RecordOperation{recordOperation},
},
}
_, err := d.client.PatchDomainRecords(context.Background(), request)
if err != nil {
return fmt.Errorf("oraclecloud: %w", err)
}
return nil
}
// CleanUp removes the TXT record matching the specified parameters.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
fqdn, value := dns01.GetRecord(domain, keyAuth)
zoneNameOrID, err1 := dns01.FindZoneByFqdn(dns01.ToFqdn(domain))
if err1 != nil {
return fmt.Errorf("oraclecloud: could not find zone for domain %q and fqdn %q : %w", domain, fqdn, err1)
}
// search to TXT record's hash to delete
getRequest := dns.GetDomainRecordsRequest{
ZoneNameOrId: common.String(zoneNameOrID),
Domain: common.String(dns01.UnFqdn(fqdn)),
CompartmentId: common.String(d.config.CompartmentID),
Rtype: common.String("TXT"),
}
ctx := context.Background()
domainRecords, err := d.client.GetDomainRecords(ctx, getRequest)
if err != nil {
return fmt.Errorf("oraclecloud: %w", err)
}
if *domainRecords.OpcTotalItems == 0 {
return errors.New("oraclecloud: no record to CleanUp")
}
var deleteHash *string
for _, record := range domainRecords.RecordCollection.Items {
if record.Rdata != nil && *record.Rdata == `"`+value+`"` {
deleteHash = record.RecordHash
break
}
}
if deleteHash == nil {
return errors.New("oraclecloud: no record to CleanUp")
}
recordOperation := dns.RecordOperation{
RecordHash: deleteHash,
Operation: dns.RecordOperationOperationRemove,
}
patchRequest := dns.PatchDomainRecordsRequest{
ZoneNameOrId: common.String(zoneNameOrID),
Domain: common.String(dns01.UnFqdn(fqdn)),
PatchDomainRecordsDetails: dns.PatchDomainRecordsDetails{
Items: []dns.RecordOperation{recordOperation},
},
CompartmentId: common.String(d.config.CompartmentID),
}
_, err = d.client.PatchDomainRecords(ctx, patchRequest)
if err != nil {
return fmt.Errorf("oraclecloud: %w", err)
}
return nil
}
// Timeout returns the timeout and interval to use when checking for DNS propagation.
// Adjusting here to cope with spikes in propagation times.
func (d *DNSProvider) Timeout() (timeout, interval time.Duration) {
return d.config.PropagationTimeout, d.config.PollingInterval
}