lego/providers/dns/rackspace/client.go

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2019-03-11 16:56:48 +00:00
package rackspace
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"github.com/go-acme/lego/v3/challenge/dns01"
)
// APIKeyCredentials API credential
type APIKeyCredentials struct {
Username string `json:"username"`
APIKey string `json:"apiKey"`
}
// Auth auth credentials
type Auth struct {
APIKeyCredentials `json:"RAX-KSKEY:apiKeyCredentials"`
}
// AuthData Auth data
type AuthData struct {
Auth `json:"auth"`
}
// Identity Identity
type Identity struct {
Access Access `json:"access"`
}
// Access Access
type Access struct {
ServiceCatalog []ServiceCatalog `json:"serviceCatalog"`
Token Token `json:"token"`
}
// Token Token
type Token struct {
ID string `json:"id"`
}
// ServiceCatalog ServiceCatalog
type ServiceCatalog struct {
Endpoints []Endpoint `json:"endpoints"`
Name string `json:"name"`
}
// Endpoint Endpoint
type Endpoint struct {
PublicURL string `json:"publicURL"`
TenantID string `json:"tenantId"`
}
// ZoneSearchResponse represents the response when querying Rackspace DNS zones
type ZoneSearchResponse struct {
TotalEntries int `json:"totalEntries"`
HostedZones []HostedZone `json:"domains"`
}
// HostedZone HostedZone
type HostedZone struct {
ID int `json:"id"`
Name string `json:"name"`
}
// Records is the list of records sent/received from the DNS API
type Records struct {
Record []Record `json:"records"`
}
// Record represents a Rackspace DNS record
type Record struct {
Name string `json:"name"`
Type string `json:"type"`
Data string `json:"data"`
TTL int `json:"ttl,omitempty"`
ID string `json:"id,omitempty"`
}
// getHostedZoneID performs a lookup to get the DNS zone which needs
// modifying for a given FQDN
func (d *DNSProvider) getHostedZoneID(fqdn string) (int, error) {
authZone, err := dns01.FindZoneByFqdn(fqdn)
if err != nil {
return 0, err
}
result, err := d.makeRequest(http.MethodGet, fmt.Sprintf("/domains?name=%s", dns01.UnFqdn(authZone)), nil)
if err != nil {
return 0, err
}
var zoneSearchResponse ZoneSearchResponse
err = json.Unmarshal(result, &zoneSearchResponse)
if err != nil {
return 0, err
}
// If nothing was returned, or for whatever reason more than 1 was returned (the search uses exact match, so should not occur)
if zoneSearchResponse.TotalEntries != 1 {
return 0, fmt.Errorf("found %d zones for %s in Rackspace for domain %s", zoneSearchResponse.TotalEntries, authZone, fqdn)
}
return zoneSearchResponse.HostedZones[0].ID, nil
}
// findTxtRecord searches a DNS zone for a TXT record with a specific name
func (d *DNSProvider) findTxtRecord(fqdn string, zoneID int) (*Record, error) {
result, err := d.makeRequest(http.MethodGet, fmt.Sprintf("/domains/%d/records?type=TXT&name=%s", zoneID, dns01.UnFqdn(fqdn)), nil)
if err != nil {
return nil, err
}
var records Records
err = json.Unmarshal(result, &records)
if err != nil {
return nil, err
}
switch len(records.Record) {
case 1:
case 0:
return nil, fmt.Errorf("no TXT record found for %s", fqdn)
default:
return nil, fmt.Errorf("more than 1 TXT record found for %s", fqdn)
}
return &records.Record[0], nil
}
// makeRequest is a wrapper function used for making DNS API requests
func (d *DNSProvider) makeRequest(method, uri string, body io.Reader) (json.RawMessage, error) {
url := d.cloudDNSEndpoint + uri
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, err
}
req.Header.Set("X-Auth-Token", d.token)
req.Header.Set("Content-Type", "application/json")
resp, err := d.config.HTTPClient.Do(req)
if err != nil {
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return nil, fmt.Errorf("error querying DNS API: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusAccepted {
return nil, fmt.Errorf("request failed for %s %s. Response code: %d", method, url, resp.StatusCode)
}
var r json.RawMessage
err = json.NewDecoder(resp.Body).Decode(&r)
if err != nil {
return nil, fmt.Errorf("JSON decode failed for %s %s. Response code: %d", method, url, resp.StatusCode)
}
return r, nil
}
func login(config *Config) (*Identity, error) {
authData := AuthData{
Auth: Auth{
APIKeyCredentials: APIKeyCredentials{
Username: config.APIUser,
APIKey: config.APIKey,
},
},
}
body, err := json.Marshal(authData)
if err != nil {
return nil, err
}
req, err := http.NewRequest(http.MethodPost, config.BaseURL, bytes.NewReader(body))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
resp, err := config.HTTPClient.Do(req)
if err != nil {
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return nil, fmt.Errorf("error querying Identity API: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("authentication failed: response code: %d", resp.StatusCode)
}
var identity Identity
err = json.NewDecoder(resp.Body).Decode(&identity)
if err != nil {
return nil, err
}
return &identity, nil
}