/
variomedia.go
189 lines (152 loc) · 5.31 KB
/
variomedia.go
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// Package variomedia implements a DNS provider for solving the DNS-01 challenge using Variomedia DNS.
package variomedia
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"sync"
"time"
"github.com/go-acme/lego/v4/challenge/dns01"
"github.com/go-acme/lego/v4/log"
"github.com/go-acme/lego/v4/platform/config/env"
"github.com/go-acme/lego/v4/platform/wait"
"github.com/go-acme/lego/v4/providers/dns/variomedia/internal"
)
// Environment variables names.
const (
envNamespace = "VARIOMEDIA_"
EnvAPIToken = envNamespace + "API_TOKEN"
EnvTTL = envNamespace + "TTL"
EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
EnvSequenceInterval = envNamespace + "SEQUENCE_INTERVAL"
EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
)
// Config is used to configure the creation of the DNSProvider.
type Config struct {
APIToken string
PropagationTimeout time.Duration
PollingInterval time.Duration
SequenceInterval time.Duration
TTL int
HTTPClient *http.Client
}
// NewDefaultConfig returns a default configuration for the DNSProvider.
func NewDefaultConfig() *Config {
return &Config{
TTL: env.GetOrDefaultInt(EnvTTL, 300),
PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
SequenceInterval: env.GetOrDefaultSecond(EnvSequenceInterval, dns01.DefaultPropagationTimeout),
HTTPClient: &http.Client{
Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
},
}
}
// DNSProvider implements the challenge.Provider interface.
type DNSProvider struct {
config *Config
client *internal.Client
recordIDs map[string]string
recordIDsMu sync.Mutex
}
// NewDNSProvider returns a DNSProvider instance.
func NewDNSProvider() (*DNSProvider, error) {
values, err := env.Get(EnvAPIToken)
if err != nil {
return nil, fmt.Errorf("variomedia: %w", err)
}
config := NewDefaultConfig()
config.APIToken = values[EnvAPIToken]
return NewDNSProviderConfig(config)
}
// NewDNSProviderConfig return a DNSProvider instance configured for Variomedia.
func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
if config.APIToken == "" {
return nil, errors.New("variomedia: missing credentials")
}
client := internal.NewClient(config.APIToken)
if config.HTTPClient != nil {
client.HTTPClient = config.HTTPClient
}
return &DNSProvider{
config: config,
client: client,
recordIDs: make(map[string]string),
}, 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
}
// Sequential All DNS challenges for this provider will be resolved sequentially.
// Returns the interval between each iteration.
func (d *DNSProvider) Sequential() time.Duration {
return d.config.SequenceInterval
}
// Present creates a TXT record to fulfill the dns-01 challenge.
func (d *DNSProvider) Present(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
authZone, err := dns01.FindZoneByFqdn(info.EffectiveFQDN)
if err != nil {
return fmt.Errorf("variomedia: could not find zone for domain %q (%s): %w", domain, info.EffectiveFQDN, err)
}
subDomain, err := dns01.ExtractSubDomain(info.EffectiveFQDN, authZone)
if err != nil {
return fmt.Errorf("variomedia: %w", err)
}
ctx := context.Background()
record := internal.DNSRecord{
RecordType: "TXT",
Name: subDomain,
Domain: dns01.UnFqdn(authZone),
Data: info.Value,
TTL: d.config.TTL,
}
cdrr, err := d.client.CreateDNSRecord(ctx, record)
if err != nil {
return fmt.Errorf("variomedia: %w", err)
}
err = d.waitJob(ctx, domain, cdrr.Data.ID)
if err != nil {
return fmt.Errorf("variomedia: %w", err)
}
d.recordIDsMu.Lock()
d.recordIDs[token] = strings.TrimPrefix(cdrr.Data.Links.DNSRecord, "https://api.variomedia.de/dns-records/")
d.recordIDsMu.Unlock()
return nil
}
// CleanUp removes the TXT record previously created.
func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
info := dns01.GetChallengeInfo(domain, keyAuth)
ctx := context.Background()
// get the record's unique ID from when we created it
d.recordIDsMu.Lock()
recordID, ok := d.recordIDs[token]
d.recordIDsMu.Unlock()
if !ok {
return fmt.Errorf("variomedia: unknown record ID for '%s'", info.EffectiveFQDN)
}
ddrr, err := d.client.DeleteDNSRecord(ctx, recordID)
if err != nil {
return fmt.Errorf("variomedia: %w", err)
}
err = d.waitJob(ctx, domain, ddrr.Data.ID)
if err != nil {
return fmt.Errorf("variomedia: %w", err)
}
return nil
}
func (d *DNSProvider) waitJob(ctx context.Context, domain string, id string) error {
return wait.For("variomedia: apply change on "+domain, d.config.PropagationTimeout, d.config.PollingInterval, func() (bool, error) {
result, err := d.client.GetJob(ctx, id)
if err != nil {
return false, err
}
log.Infof("variomedia: [%s] %s: %s %s", domain, result.Data.ID, result.Data.Attributes.JobType, result.Data.Attributes.Status)
return result.Data.Attributes.Status == "done", nil
})
}