forked from TrueCloudLab/lego
179 lines
4.8 KiB
Go
179 lines
4.8 KiB
Go
// Package easydns implements a DNS provider for solving the DNS-01 challenge using EasyDNS API.
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package easydns
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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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"net/url"
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"strconv"
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"strings"
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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/platform/config/env"
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"github.com/miekg/dns"
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)
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// Environment variables names.
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const (
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envNamespace = "EASYDNS_"
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EnvEndpoint = envNamespace + "ENDPOINT"
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EnvToken = envNamespace + "TOKEN"
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EnvKey = envNamespace + "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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EnvSequenceInterval = envNamespace + "SEQUENCE_INTERVAL"
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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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Endpoint *url.URL
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Token string
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Key string
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TTL int
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HTTPClient *http.Client
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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SequenceInterval time.Duration
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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, 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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SequenceInterval: env.GetOrDefaultSecond(EnvSequenceInterval, dns01.DefaultPropagationTimeout),
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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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recordIDs map[string]string
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recordIDsMu sync.Mutex
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}
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// NewDNSProvider returns a DNSProvider instance.
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func NewDNSProvider() (*DNSProvider, error) {
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config := NewDefaultConfig()
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endpoint, err := url.Parse(env.GetOrDefaultString(EnvEndpoint, defaultEndpoint))
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if err != nil {
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return nil, fmt.Errorf("easydns: %w", err)
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}
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config.Endpoint = endpoint
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values, err := env.Get(EnvToken, EnvKey)
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if err != nil {
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return nil, fmt.Errorf("easydns: %w", err)
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}
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config.Token = values[EnvToken]
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config.Key = values[EnvKey]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for EasyDNS.
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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("easydns: the configuration of the DNS provider is nil")
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}
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if config.Token == "" {
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return nil, errors.New("easydns: the API token is missing")
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}
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if config.Key == "" {
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return nil, errors.New("easydns: the API key is missing")
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}
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return &DNSProvider{config: config, recordIDs: map[string]string{}}, 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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info := dns01.GetChallengeInfo(domain, keyAuth)
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apiHost, apiDomain := splitFqdn(info.EffectiveFQDN)
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record := &zoneRecord{
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Domain: apiDomain,
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Host: apiHost,
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Type: "TXT",
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Rdata: info.Value,
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TTL: strconv.Itoa(d.config.TTL),
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Prio: "0",
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}
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recordID, err := d.addRecord(apiDomain, record)
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if err != nil {
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return fmt.Errorf("easydns: error adding zone record: %w", err)
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}
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key := getMapKey(info.EffectiveFQDN, info.Value)
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d.recordIDsMu.Lock()
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d.recordIDs[key] = recordID
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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 matching the specified parameters.
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func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
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info := dns01.GetChallengeInfo(domain, keyAuth)
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key := getMapKey(info.EffectiveFQDN, info.Value)
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recordID, exists := d.recordIDs[key]
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if !exists {
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return nil
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}
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_, apiDomain := splitFqdn(info.EffectiveFQDN)
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err := d.deleteRecord(apiDomain, recordID)
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d.recordIDsMu.Lock()
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defer delete(d.recordIDs, key)
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d.recordIDsMu.Unlock()
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if err != nil {
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return fmt.Errorf("easydns: %w", err)
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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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// Sequential All DNS challenges for this provider will be resolved sequentially.
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// Returns the interval between each iteration.
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func (d *DNSProvider) Sequential() time.Duration {
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return d.config.SequenceInterval
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}
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func splitFqdn(fqdn string) (host, domain string) {
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parts := dns.SplitDomainName(fqdn)
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length := len(parts)
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host = strings.Join(parts[0:length-2], ".")
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domain = strings.Join(parts[length-2:length], ".")
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return
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}
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func getMapKey(fqdn, value string) string {
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return fqdn + "|" + value
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}
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