181 lines
4.8 KiB
Go
181 lines
4.8 KiB
Go
// Package liara implements a DNS provider for solving the DNS-01 challenge using Liara DNS.
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package liara
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import (
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"errors"
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"fmt"
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"net/http"
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"sync"
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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/log"
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"github.com/go-acme/lego/v4/platform/config/env"
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"github.com/go-acme/lego/v4/providers/dns/liara/internal"
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"github.com/hashicorp/go-retryablehttp"
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)
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const (
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minTTL = 120
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maxTTL = 432000
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)
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// Environment variables names.
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const (
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envNamespace = "LIARA_"
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EnvAPIKey = envNamespace + "API_KEY"
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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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TTL int
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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HTTPClient *http.Client
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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: env.GetOrDefaultInt(EnvTTL, 3600),
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PropagationTimeout: env.GetOrDefaultSecond(EnvPropagationTimeout, dns01.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond(EnvPollingInterval, dns01.DefaultPollingInterval),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond(EnvHTTPTimeout, 30*time.Second),
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},
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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 *internal.Client
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recordIDs map[string]string
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recordIDsMu sync.Mutex
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}
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// NewDNSProvider returns a DNSProvider instance configured for Liara DNS.
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// Liara_API_KEY must be passed in the environment variables.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get(EnvAPIKey)
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if err != nil {
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return nil, fmt.Errorf("liara: %w", err)
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}
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config := NewDefaultConfig()
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config.APIKey = values[EnvAPIKey]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for Liara DNS.
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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("liara: the configuration of the DNS provider is nil")
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}
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if config.APIKey == "" {
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return nil, errors.New("liara: APIKey is missing")
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}
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if config.TTL < minTTL {
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return nil, fmt.Errorf("liara: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
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}
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if config.TTL > maxTTL {
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return nil, fmt.Errorf("liara: invalid TTL, TTL (%d) must be lower than %d", config.TTL, maxTTL)
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}
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client := internal.NewClient(config.APIKey)
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retryClient := retryablehttp.NewClient()
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retryClient.RetryMax = 5
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if config.HTTPClient != nil {
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retryClient.HTTPClient = config.HTTPClient
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}
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retryClient.Logger = log.Logger
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client.HTTPClient = retryClient.StandardClient()
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return &DNSProvider{
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config: config,
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client: client,
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recordIDs: make(map[string]string),
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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 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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// 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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fqdn, value := dns01.GetRecord(domain, keyAuth)
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authZone, err := dns01.FindZoneByFqdn(fqdn)
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if err != nil {
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return fmt.Errorf("liara: %w", err)
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}
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subDomain, err := dns01.ExtractSubDomain(fqdn, authZone)
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if err != nil {
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return fmt.Errorf("liara: %w", err)
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}
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record := internal.Record{
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Type: "TXT",
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Name: subDomain,
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Contents: []internal.Content{{Text: value}},
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TTL: d.config.TTL,
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}
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newRecord, err := d.client.CreateRecord(dns01.UnFqdn(authZone), record)
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if err != nil {
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return fmt.Errorf("liara: failed to create TXT record, fqdn=%s: %w", fqdn, err)
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}
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d.recordIDsMu.Lock()
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d.recordIDs[token] = newRecord.ID
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d.recordIDsMu.Unlock()
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return nil
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}
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// CleanUp removes the TXT record.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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fqdn, _ := dns01.GetRecord(domain, keyAuth)
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authZone, err := dns01.FindZoneByFqdn(fqdn)
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if err != nil {
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return fmt.Errorf("liara: %w", err)
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}
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// gets the record's unique ID
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d.recordIDsMu.Lock()
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recordID, ok := d.recordIDs[token]
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d.recordIDsMu.Unlock()
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if !ok {
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return fmt.Errorf("liara: unknown record ID for '%s' '%s'", fqdn, token)
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}
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err = d.client.DeleteRecord(dns01.UnFqdn(authZone), recordID)
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if err != nil {
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return fmt.Errorf("liara: failed to delete TXT record, id=%s: %w", recordID, err)
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}
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// deletes record ID from map
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d.recordIDsMu.Lock()
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delete(d.recordIDs, token)
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d.recordIDsMu.Unlock()
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return nil
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}
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