Migrate to go-acme/lego.

vendor/github.com/go-acme/lego/providers/dns/linode/linode.go

@@ -0,0 +1,164 @@
+// Package linode implements a DNS provider for solving the DNS-01 challenge using Linode DNS.
+package linode
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/go-acme/lego/challenge/dns01"
+	"github.com/go-acme/lego/platform/config/env"
+	"github.com/timewasted/linode/dns"
+)
+
+const (
+	minTTL             = 300
+	dnsUpdateFreqMins  = 15
+	dnsUpdateFudgeSecs = 120
+)
+
+// Config is used to configure the creation of the DNSProvider
+type Config struct {
+	APIKey          string
+	PollingInterval time.Duration
+	TTL             int
+}
+
+// NewDefaultConfig returns a default configuration for the DNSProvider
+func NewDefaultConfig() *Config {
+	return &Config{
+		PollingInterval: env.GetOrDefaultSecond("LINODE_POLLING_INTERVAL", 15*time.Second),
+		TTL:             env.GetOrDefaultInt("LINODE_TTL", minTTL),
+	}
+}
+
+type hostedZoneInfo struct {
+	domainID     int
+	resourceName string
+}
+
+// DNSProvider implements the acme.ChallengeProvider interface.
+type DNSProvider struct {
+	config *Config
+	client *dns.DNS
+}
+
+// NewDNSProvider returns a DNSProvider instance configured for Linode.
+// Credentials must be passed in the environment variable: LINODE_API_KEY.
+func NewDNSProvider() (*DNSProvider, error) {
+	values, err := env.Get("LINODE_API_KEY")
+	if err != nil {
+		return nil, fmt.Errorf("linode: %v", err)
+	}
+
+	config := NewDefaultConfig()
+	config.APIKey = values["LINODE_API_KEY"]
+
+	return NewDNSProviderConfig(config)
+}
+
+// NewDNSProviderConfig return a DNSProvider instance configured for Linode.
+func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
+	if config == nil {
+		return nil, errors.New("linode: the configuration of the DNS provider is nil")
+	}
+
+	if len(config.APIKey) == 0 {
+		return nil, errors.New("linode: credentials missing")
+	}
+
+	if config.TTL < minTTL {
+		return nil, fmt.Errorf("linode: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
+	}
+
+	return &DNSProvider{
+		config: config,
+		client: dns.New(config.APIKey),
+	}, 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) {
+	// Since Linode only updates their zone files every X minutes, we need
+	// to figure out how many minutes we have to wait until we hit the next
+	// interval of X.  We then wait another couple of minutes, just to be
+	// safe.  Hopefully at some point during all of this, the record will
+	// have propagated throughout Linode's network.
+	minsRemaining := dnsUpdateFreqMins - (time.Now().Minute() % dnsUpdateFreqMins)
+
+	timeout = (time.Duration(minsRemaining) * time.Minute) +
+		(minTTL * time.Second) +
+		(dnsUpdateFudgeSecs * time.Second)
+	interval = d.config.PollingInterval
+	return
+}
+
+// Present creates a TXT record using the specified parameters.
+func (d *DNSProvider) Present(domain, token, keyAuth string) error {
+	fqdn, value := dns01.GetRecord(domain, keyAuth)
+	zone, err := d.getHostedZoneInfo(fqdn)
+	if err != nil {
+		return err
+	}
+
+	if _, err = d.client.CreateDomainResourceTXT(zone.domainID, dns01.UnFqdn(fqdn), value, d.config.TTL); err != nil {
+		return 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)
+	zone, err := d.getHostedZoneInfo(fqdn)
+	if err != nil {
+		return err
+	}
+
+	// Get all TXT records for the specified domain.
+	resources, err := d.client.GetResourcesByType(zone.domainID, "TXT")
+	if err != nil {
+		return err
+	}
+
+	// Remove the specified resource, if it exists.
+	for _, resource := range resources {
+		if resource.Name == zone.resourceName && resource.Target == value {
+			resp, err := d.client.DeleteDomainResource(resource.DomainID, resource.ResourceID)
+			if err != nil {
+				return err
+			}
+
+			if resp.ResourceID != resource.ResourceID {
+				return errors.New("error deleting resource: resource IDs do not match")
+			}
+			break
+		}
+	}
+
+	return nil
+}
+
+func (d *DNSProvider) getHostedZoneInfo(fqdn string) (*hostedZoneInfo, error) {
+	// Lookup the zone that handles the specified FQDN.
+	authZone, err := dns01.FindZoneByFqdn(fqdn)
+	if err != nil {
+		return nil, err
+	}
+
+	resourceName := strings.TrimSuffix(fqdn, "."+authZone)
+
+	// Query the authority zone.
+	domain, err := d.client.GetDomain(dns01.UnFqdn(authZone))
+	if err != nil {
+		return nil, err
+	}
+
+	return &hostedZoneInfo{
+		domainID:     domain.DomainID,
+		resourceName: resourceName,
+	}, nil
+}