271 lines
7.3 KiB
Go
271 lines
7.3 KiB
Go
// Package exoscale implements a DNS provider for solving the DNS-01 challenge using Exoscale DNS.
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package exoscale
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import (
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"context"
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"errors"
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"fmt"
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"time"
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egoscale "github.com/exoscale/egoscale/v2"
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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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// Default Exoscale API endpoint.
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const defaultBaseURL = "https://api.exoscale.com/v2"
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// Default Exosacle API zone.
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// Each data center location hosts the API and API zone determines which one to connect to.
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const defaultAPIZone = "ch-gva-2"
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// Environment variables names.
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const (
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envNamespace = "EXOSCALE_"
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EnvAPISecret = envNamespace + "API_SECRET"
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EnvAPIKey = envNamespace + "API_KEY"
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EnvEndpoint = envNamespace + "ENDPOINT"
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EnvAPIZone = envNamespace + "API_ZONE"
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EnvTTL = envNamespace + "TTL"
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EnvPropagationTimeout = envNamespace + "PROPAGATION_TIMEOUT"
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EnvPollingInterval = envNamespace + "POLLING_INTERVAL"
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EnvHTTPTimeout = envNamespace + "HTTP_TIMEOUT"
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)
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// Config is used to configure the creation of the DNSProvider.
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type Config struct {
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APIKey string
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APISecret string
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Endpoint string
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HTTPTimeout time.Duration
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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TTL int64
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}
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// NewDefaultConfig returns a default configuration for the DNSProvider.
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func NewDefaultConfig() *Config {
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return &Config{
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TTL: int64(env.GetOrDefaultInt(EnvTTL, dns01.DefaultTTL)),
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
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HTTPTimeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 60*time.Second),
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}
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}
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// DNSProvider implements the challenge.Provider interface.
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type DNSProvider struct {
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config *Config
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client *egoscale.Client
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apiZone string
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}
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// NewDNSProvider Credentials must be passed in the environment variables:
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// EXOSCALE_API_KEY, EXOSCALE_API_SECRET, EXOSCALE_ENDPOINT.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get(EnvAPIKey, EnvAPISecret)
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if err != nil {
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return nil, fmt.Errorf("exoscale: %w", err)
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}
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config := NewDefaultConfig()
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config.APIKey = values[EnvAPIKey]
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config.APISecret = values[EnvAPISecret]
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config.Endpoint = env.GetOrFile(EnvEndpoint)
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Exoscale.
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func NewDNSProviderConfig(config *Config) (*DNSProvider, error) {
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if config == nil {
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return nil, errors.New("exoscale: the configuration of the DNS provider is nil")
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}
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if config.APIKey == "" || config.APISecret == "" {
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return nil, errors.New("exoscale: credentials missing")
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}
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if config.Endpoint == "" {
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config.Endpoint = defaultBaseURL
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}
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client, err := egoscale.NewClient(
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config.APIKey,
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config.APISecret,
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egoscale.ClientOptWithAPIEndpoint(config.Endpoint),
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egoscale.ClientOptWithTimeout(config.HTTPTimeout),
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)
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if err != nil {
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return nil, fmt.Errorf("exoscale: initializing client: %w", err)
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}
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return &DNSProvider{
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client: client,
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config: config,
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apiZone: env.GetOrDefaultString(EnvAPIZone, defaultAPIZone),
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}, nil
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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 *DNSProvider) 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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zoneName, recordName, err := d.findZoneAndRecordName(info.EffectiveFQDN)
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if err != nil {
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return err
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}
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zone, err := d.findExistingZone(zoneName)
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if err != nil {
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return fmt.Errorf("exoscale: %w", err)
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}
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if zone == nil {
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return fmt.Errorf("exoscale: zone %q not found", zoneName)
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}
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recordID, err := d.findExistingRecordID(deref(zone.ID), recordName)
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if err != nil {
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return fmt.Errorf("exoscale: %w", err)
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}
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if recordID == "" {
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record := egoscale.DNSDomainRecord{
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Name: pointer(recordName),
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TTL: pointer(d.config.TTL),
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Content: pointer(info.Value),
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Type: pointer("TXT"),
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}
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_, err = d.client.CreateDNSDomainRecord(ctx, d.apiZone, deref(zone.ID), &record)
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if err != nil {
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return fmt.Errorf("exoscale: error while creating DNS record: %w", err)
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}
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return nil
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}
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record := egoscale.DNSDomainRecord{
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ID: pointer(recordID),
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Name: pointer(recordName),
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TTL: pointer(d.config.TTL),
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Content: pointer(info.Value),
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Type: pointer("TXT"),
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}
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err = d.client.UpdateDNSDomainRecord(ctx, d.apiZone, deref(zone.ID), &record)
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if err != nil {
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return fmt.Errorf("exoscale: error while updating DNS record: %w", err)
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}
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return nil
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}
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// CleanUp removes the record matching the specified parameters.
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func (d *DNSProvider) 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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zoneName, recordName, err := d.findZoneAndRecordName(info.EffectiveFQDN)
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if err != nil {
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return err
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}
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zone, err := d.findExistingZone(zoneName)
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if err != nil {
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return fmt.Errorf("exoscale: %w", err)
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}
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if zone == nil {
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return fmt.Errorf("exoscale: zone %q not found", zoneName)
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}
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recordID, err := d.findExistingRecordID(deref(zone.ID), recordName)
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if err != nil {
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return err
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}
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if recordID != "" {
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err = d.client.DeleteDNSDomainRecord(ctx, d.apiZone, deref(zone.ID), &egoscale.DNSDomainRecord{ID: &recordID})
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if err != nil {
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return fmt.Errorf("exoscale: error while deleting DNS record: %w", err)
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}
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}
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return nil
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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 *DNSProvider) Timeout() (timeout, interval time.Duration) {
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return d.config.PropagationTimeout, d.config.PollingInterval
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}
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// findExistingZone Query Exoscale to find an existing zone for this name.
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// Returns nil result if no zone could be found.
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func (d *DNSProvider) findExistingZone(zoneName string) (*egoscale.DNSDomain, error) {
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ctx := context.Background()
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zones, err := d.client.ListDNSDomains(ctx, d.apiZone)
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if err != nil {
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return nil, fmt.Errorf("error while retrieving DNS zones: %w", err)
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}
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for _, zone := range zones {
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if zone.UnicodeName != nil && deref(zone.UnicodeName) == zoneName {
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return &zone, nil
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}
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}
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return nil, nil
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}
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// findExistingRecordID Query Exoscale to find an existing record for this name.
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// Returns empty result if no record could be found.
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func (d *DNSProvider) findExistingRecordID(zoneID, recordName string) (string, error) {
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ctx := context.Background()
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records, err := d.client.ListDNSDomainRecords(ctx, d.apiZone, zoneID)
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if err != nil {
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return "", fmt.Errorf("error while retrieving DNS records: %w", err)
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}
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for _, record := range records {
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if deref(record.Name) == recordName &&
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deref(record.Type) == "TXT" {
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return deref(record.ID), nil
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}
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}
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return "", nil
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}
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// findZoneAndRecordName Extract DNS zone and DNS entry name.
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func (d *DNSProvider) findZoneAndRecordName(fqdn string) (string, string, error) {
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zone, err := dns01.FindZoneByFqdn(fqdn)
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if err != nil {
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return "", "", err
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}
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zone = dns01.UnFqdn(zone)
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subDomain, err := dns01.ExtractSubDomain(fqdn, zone)
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if err != nil {
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return "", "", err
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}
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return zone, subDomain, nil
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}
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func pointer[T string | int | int32 | int64](v T) *T { return &v }
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func deref[T string | int | int32 | int64](v *T) T {
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if v == nil {
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var zero T
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return zero
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}
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return *v
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}
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