134 lines
3.9 KiB
Go
134 lines
3.9 KiB
Go
package azure
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"time"
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"github.com/Azure/azure-sdk-for-go/services/dns/mgmt/2017-09-01/dns"
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"github.com/Azure/go-autorest/autorest"
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"github.com/Azure/go-autorest/autorest/to"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/platform/config/env"
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)
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// dnsProviderPublic implements the challenge.Provider interface for Azure Public Zone DNS.
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type dnsProviderPublic struct {
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config *Config
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authorizer autorest.Authorizer
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}
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// Timeout returns the timeout and interval to use when checking for DNS propagation.
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// Adjusting here to cope with spikes in propagation times.
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func (d *dnsProviderPublic) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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// Present creates a TXT record to fulfill the dns-01 challenge.
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func (d *dnsProviderPublic) Present(domain, token, keyAuth string) error {
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ctx := context.Background()
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info := dns01.GetChallengeInfo(domain, keyAuth)
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zone, err := d.getHostedZoneID(ctx, info.EffectiveFQDN)
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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rsc := dns.NewRecordSetsClientWithBaseURI(d.config.ResourceManagerEndpoint, d.config.SubscriptionID)
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rsc.Authorizer = d.authorizer
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subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, zone)
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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// Get existing record set
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rset, err := rsc.Get(ctx, d.config.ResourceGroup, zone, subDomain, dns.TXT)
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if err != nil {
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var detailed autorest.DetailedError
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if !errors.As(err, &detailed) || detailed.StatusCode != http.StatusNotFound {
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return fmt.Errorf("azure: %w", err)
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}
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}
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// Construct unique TXT records using map
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uniqRecords := map[string]struct{}{info.Value: {}}
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if rset.RecordSetProperties != nil && rset.TxtRecords != nil {
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for _, txtRecord := range *rset.TxtRecords {
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// Assume Value doesn't contain multiple strings
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values := to.StringSlice(txtRecord.Value)
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if len(values) > 0 {
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uniqRecords[values[0]] = struct{}{}
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}
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}
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}
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var txtRecords []dns.TxtRecord
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for txt := range uniqRecords {
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txtRecords = append(txtRecords, dns.TxtRecord{Value: &[]string{txt}})
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}
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rec := dns.RecordSet{
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Name: &subDomain,
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RecordSetProperties: &dns.RecordSetProperties{
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TTL: to.Int64Ptr(int64(d.config.TTL)),
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TxtRecords: &txtRecords,
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},
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}
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_, err = rsc.CreateOrUpdate(ctx, d.config.ResourceGroup, zone, subDomain, dns.TXT, rec, "", "")
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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return nil
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}
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// CleanUp removes the TXT record matching the specified parameters.
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func (d *dnsProviderPublic) CleanUp(domain, token, keyAuth string) error {
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ctx := context.Background()
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info := dns01.GetChallengeInfo(domain, keyAuth)
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zone, err := d.getHostedZoneID(ctx, info.EffectiveFQDN)
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, zone)
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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rsc := dns.NewRecordSetsClientWithBaseURI(d.config.ResourceManagerEndpoint, d.config.SubscriptionID)
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rsc.Authorizer = d.authorizer
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_, err = rsc.Delete(ctx, d.config.ResourceGroup, zone, subDomain, dns.TXT, "")
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if err != nil {
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return fmt.Errorf("azure: %w", err)
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}
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return nil
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}
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// Checks that azure has a zone for this domain name.
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func (d *dnsProviderPublic) getHostedZoneID(ctx context.Context, fqdn string) (string, error) {
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if zone := env.GetOrFile(EnvZoneName); zone != "" {
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return zone, nil
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}
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authZone, err := dns01.FindZoneByFqdn(fqdn)
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if err != nil {
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return "", fmt.Errorf("could not find zone for FQDN %q: %w", fqdn, err)
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}
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dc := dns.NewZonesClientWithBaseURI(d.config.ResourceManagerEndpoint, d.config.SubscriptionID)
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dc.Authorizer = d.authorizer
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zone, err := dc.Get(ctx, d.config.ResourceGroup, dns01.UnFqdn(authZone))
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if err != nil {
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return "", err
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}
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// zone.Name shouldn't have a trailing dot(.)
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return to.String(zone.Name), nil
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}
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