131 lines
3.6 KiB
Go
131 lines
3.6 KiB
Go
// Package linode implements a DNS provider for solving the DNS-01 challenge
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// using Linode DNS.
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package linode
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import (
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"errors"
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"os"
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"strings"
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"time"
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"github.com/timewasted/linode/dns"
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"github.com/xenolf/lego/acme"
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)
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const (
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dnsMinTTLSecs = 300
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dnsUpdateFreqMins = 15
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dnsUpdateFudgeSecs = 120
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)
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type hostedZoneInfo struct {
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domainID int
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resourceName string
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}
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// DNSProvider implements the acme.ChallengeProvider interface.
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type DNSProvider struct {
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linode *dns.DNS
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}
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// NewDNSProvider returns a DNSProvider instance configured for Linode.
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// Credentials must be passed in the environment variable: LINODE_API_KEY.
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func NewDNSProvider() (*DNSProvider, error) {
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apiKey := os.Getenv("LINODE_API_KEY")
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return NewDNSProviderCredentials(apiKey)
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}
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// NewDNSProviderCredentials uses the supplied credentials to return a
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// DNSProvider instance configured for Linode.
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func NewDNSProviderCredentials(apiKey string) (*DNSProvider, error) {
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if len(apiKey) == 0 {
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return nil, errors.New("Linode credentials missing")
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}
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return &DNSProvider{
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linode: dns.New(apiKey),
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}, nil
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}
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// Timeout returns the timeout and interval to use when checking for DNS
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// propagation. Adjusting here to cope with spikes in propagation times.
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func (p *DNSProvider) Timeout() (timeout, interval time.Duration) {
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// Since Linode only updates their zone files every X minutes, we need
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// to figure out how many minutes we have to wait until we hit the next
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// interval of X. We then wait another couple of minutes, just to be
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// safe. Hopefully at some point during all of this, the record will
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// have propagated throughout Linode's network.
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minsRemaining := dnsUpdateFreqMins - (time.Now().Minute() % dnsUpdateFreqMins)
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timeout = (time.Duration(minsRemaining) * time.Minute) +
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(dnsMinTTLSecs * time.Second) +
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(dnsUpdateFudgeSecs * time.Second)
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interval = 15 * time.Second
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return
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}
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// Present creates a TXT record using the specified parameters.
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func (p *DNSProvider) Present(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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zone, err := p.getHostedZoneInfo(fqdn)
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if err != nil {
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return err
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}
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if _, err = p.linode.CreateDomainResourceTXT(zone.domainID, acme.UnFqdn(fqdn), value, 60); err != nil {
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return 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 (p *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, value, _ := acme.DNS01Record(domain, keyAuth)
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zone, err := p.getHostedZoneInfo(fqdn)
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if err != nil {
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return err
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}
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// Get all TXT records for the specified domain.
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resources, err := p.linode.GetResourcesByType(zone.domainID, "TXT")
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if err != nil {
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return err
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}
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// Remove the specified resource, if it exists.
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for _, resource := range resources {
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if resource.Name == zone.resourceName && resource.Target == value {
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resp, err := p.linode.DeleteDomainResource(resource.DomainID, resource.ResourceID)
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if err != nil {
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return err
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}
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if resp.ResourceID != resource.ResourceID {
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return errors.New("error deleting resource: resource IDs do not match")
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}
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break
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}
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}
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return nil
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}
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func (p *DNSProvider) getHostedZoneInfo(fqdn string) (*hostedZoneInfo, error) {
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// Lookup the zone that handles the specified FQDN.
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authZone, err := acme.FindZoneByFqdn(fqdn, acme.RecursiveNameservers)
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if err != nil {
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return nil, err
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}
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resourceName := strings.TrimSuffix(fqdn, "."+authZone)
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// Query the authority zone.
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domain, err := p.linode.GetDomain(acme.UnFqdn(authZone))
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if err != nil {
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return nil, err
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}
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return &hostedZoneInfo{
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domainID: domain.DomainID,
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resourceName: resourceName,
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}, nil
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}
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