mirror of
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180 lines
5.2 KiB
Go
180 lines
5.2 KiB
Go
// Package otc implements a DNS provider for solving the DNS-01 challenge using Open Telekom Cloud Managed DNS.
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package otc
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import (
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"errors"
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"fmt"
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"net"
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"net/http"
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"time"
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"github.com/go-acme/lego/challenge/dns01"
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"github.com/go-acme/lego/platform/config/env"
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)
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const defaultIdentityEndpoint = "https://iam.eu-de.otc.t-systems.com:443/v3/auth/tokens"
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// minTTL 300 is otc minimum value for ttl
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const minTTL = 300
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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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IdentityEndpoint string
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DomainName string
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ProjectName string
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UserName string
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Password string
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PropagationTimeout time.Duration
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PollingInterval time.Duration
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TTL int
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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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IdentityEndpoint: env.GetOrDefaultString("OTC_IDENTITY_ENDPOINT", defaultIdentityEndpoint),
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PropagationTimeout: env.GetOrDefaultSecond("OTC_PROPAGATION_TIMEOUT", dns01.DefaultPropagationTimeout),
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PollingInterval: env.GetOrDefaultSecond("OTC_POLLING_INTERVAL", dns01.DefaultPollingInterval),
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TTL: env.GetOrDefaultInt("OTC_TTL", minTTL),
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HTTPClient: &http.Client{
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Timeout: env.GetOrDefaultSecond("OTC_HTTP_TIMEOUT", 10*time.Second),
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Transport: &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: (&net.Dialer{
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Timeout: 30 * time.Second,
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KeepAlive: 30 * time.Second,
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DualStack: true,
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}).DialContext,
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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// Workaround for keep alive bug in otc api
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DisableKeepAlives: true,
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},
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},
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}
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}
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// DNSProvider is an implementation of the acme.ChallengeProvider interface that uses
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// OTC's Managed DNS API to manage TXT records for a domain.
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type DNSProvider struct {
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config *Config
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baseURL string
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token string
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}
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// NewDNSProvider returns a DNSProvider instance configured for OTC DNS.
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// Credentials must be passed in the environment variables: OTC_USER_NAME,
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// OTC_DOMAIN_NAME, OTC_PASSWORD OTC_PROJECT_NAME and OTC_IDENTITY_ENDPOINT.
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func NewDNSProvider() (*DNSProvider, error) {
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values, err := env.Get("OTC_DOMAIN_NAME", "OTC_USER_NAME", "OTC_PASSWORD", "OTC_PROJECT_NAME")
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if err != nil {
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return nil, fmt.Errorf("otc: %v", err)
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}
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config := NewDefaultConfig()
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config.DomainName = values["OTC_DOMAIN_NAME"]
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config.UserName = values["OTC_USER_NAME"]
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config.Password = values["OTC_PASSWORD"]
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config.ProjectName = values["OTC_PROJECT_NAME"]
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return NewDNSProviderConfig(config)
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}
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// NewDNSProviderConfig return a DNSProvider instance configured for OTC 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("otc: the configuration of the DNS provider is nil")
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}
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if config.DomainName == "" || config.UserName == "" || config.Password == "" || config.ProjectName == "" {
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return nil, fmt.Errorf("otc: credentials missing")
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}
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if config.TTL < minTTL {
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return nil, fmt.Errorf("otc: invalid TTL, TTL (%d) must be greater than %d", config.TTL, minTTL)
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}
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if config.IdentityEndpoint == "" {
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config.IdentityEndpoint = defaultIdentityEndpoint
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}
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return &DNSProvider{config: config}, nil
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}
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// Present creates a TXT record using the specified parameters
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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("otc: %v", err)
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}
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err = d.login()
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if err != nil {
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return fmt.Errorf("otc: %v", err)
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}
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zoneID, err := d.getZoneID(authZone)
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if err != nil {
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return fmt.Errorf("otc: unable to get zone: %s", err)
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}
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resource := fmt.Sprintf("zones/%s/recordsets", zoneID)
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r1 := &recordset{
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Name: fqdn,
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Description: "Added TXT record for ACME dns-01 challenge using lego client",
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Type: "TXT",
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TTL: d.config.TTL,
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Records: []string{fmt.Sprintf("\"%s\"", value)},
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}
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_, err = d.sendRequest(http.MethodPost, resource, r1)
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if err != nil {
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return fmt.Errorf("otc: %v", err)
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}
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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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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("otc: %v", err)
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}
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err = d.login()
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if err != nil {
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return fmt.Errorf("otc: %v", err)
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}
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zoneID, err := d.getZoneID(authZone)
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if err != nil {
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return fmt.Errorf("otc: %v", err)
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}
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recordID, err := d.getRecordSetID(zoneID, fqdn)
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if err != nil {
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return fmt.Errorf("otc: unable go get record %s for zone %s: %s", fqdn, domain, err)
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}
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err = d.deleteRecordSet(zoneID, recordID)
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if err != nil {
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return fmt.Errorf("otc: %v", 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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