forked from TrueCloudLab/lego
282 lines
6.4 KiB
Go
282 lines
6.4 KiB
Go
package internal
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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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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"github.com/go-acme/lego/v3/challenge/dns01"
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)
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const defaultBaseURL = "https://api.cloudns.net/dns/"
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type apiResponse struct {
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Status string `json:"status"`
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StatusDescription string `json:"statusDescription"`
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}
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type Zone struct {
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Name string
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Type string
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Zone string
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Status string // is an integer, but cast as string
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}
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// TXTRecord a TXT record.
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type TXTRecord struct {
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ID int `json:"id,string"`
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Type string `json:"type"`
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Host string `json:"host"`
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Record string `json:"record"`
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Failover int `json:"failover,string"`
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TTL int `json:"ttl,string"`
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Status int `json:"status"`
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}
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type TXTRecords map[string]TXTRecord
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// NewClient creates a ClouDNS client.
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func NewClient(authID, subAuthID, authPassword string) (*Client, error) {
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if authID == "" && subAuthID == "" {
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return nil, errors.New("credentials missing: authID or subAuthID")
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}
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if authPassword == "" {
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return nil, errors.New("credentials missing: authPassword")
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}
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baseURL, err := url.Parse(defaultBaseURL)
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if err != nil {
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return nil, err
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}
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return &Client{
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authID: authID,
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subAuthID: subAuthID,
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authPassword: authPassword,
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HTTPClient: &http.Client{},
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BaseURL: baseURL,
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}, nil
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}
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// Client ClouDNS client.
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type Client struct {
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authID string
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subAuthID string
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authPassword string
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HTTPClient *http.Client
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BaseURL *url.URL
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}
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// GetZone Get domain name information for a FQDN.
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func (c *Client) GetZone(authFQDN string) (*Zone, error) {
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authZone, err := dns01.FindZoneByFqdn(authFQDN)
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if err != nil {
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return nil, err
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}
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authZoneName := dns01.UnFqdn(authZone)
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reqURL := *c.BaseURL
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reqURL.Path += "get-zone-info.json"
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q := reqURL.Query()
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q.Add("domain-name", authZoneName)
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reqURL.RawQuery = q.Encode()
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result, err := c.doRequest(http.MethodGet, &reqURL)
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if err != nil {
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return nil, err
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}
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var zone Zone
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if len(result) > 0 {
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if err = json.Unmarshal(result, &zone); err != nil {
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return nil, fmt.Errorf("zone unmarshaling error: %w", err)
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}
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}
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if zone.Name == authZoneName {
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return &zone, nil
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}
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return nil, fmt.Errorf("zone %s not found for authFQDN %s", authZoneName, authFQDN)
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}
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// FindTxtRecord return the TXT record a zone ID and a FQDN.
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func (c *Client) FindTxtRecord(zoneName, fqdn string) (*TXTRecord, error) {
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host := dns01.UnFqdn(strings.TrimSuffix(dns01.UnFqdn(fqdn), zoneName))
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reqURL := *c.BaseURL
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reqURL.Path += "records.json"
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q := reqURL.Query()
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q.Add("domain-name", zoneName)
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q.Add("host", host)
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q.Add("type", "TXT")
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reqURL.RawQuery = q.Encode()
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result, err := c.doRequest(http.MethodGet, &reqURL)
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if err != nil {
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return nil, err
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}
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// the API returns [] when there is no records.
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if string(result) == "[]" {
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return nil, nil
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}
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var records TXTRecords
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if err = json.Unmarshal(result, &records); err != nil {
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return nil, fmt.Errorf("TXT record unmarshaling error: %w: %s", err, string(result))
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}
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for _, record := range records {
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if record.Host == host && record.Type == "TXT" {
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return &record, nil
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}
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}
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return nil, nil
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}
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// AddTxtRecord add a TXT record.
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func (c *Client) AddTxtRecord(zoneName, fqdn, value string, ttl int) error {
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host := dns01.UnFqdn(strings.TrimSuffix(dns01.UnFqdn(fqdn), zoneName))
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reqURL := *c.BaseURL
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reqURL.Path += "add-record.json"
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q := reqURL.Query()
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q.Add("domain-name", zoneName)
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q.Add("host", host)
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q.Add("record", value)
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q.Add("ttl", strconv.Itoa(ttlRounder(ttl)))
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q.Add("record-type", "TXT")
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reqURL.RawQuery = q.Encode()
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raw, err := c.doRequest(http.MethodPost, &reqURL)
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if err != nil {
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return err
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}
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resp := apiResponse{}
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if err = json.Unmarshal(raw, &resp); err != nil {
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return fmt.Errorf("apiResponse unmarshaling error: %w: %s", err, string(raw))
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}
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if resp.Status != "Success" {
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return fmt.Errorf("fail to add TXT record: %s %s", resp.Status, resp.StatusDescription)
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}
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return nil
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}
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// RemoveTxtRecord remove a TXT record.
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func (c *Client) RemoveTxtRecord(recordID int, zoneName string) error {
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reqURL := *c.BaseURL
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reqURL.Path += "delete-record.json"
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q := reqURL.Query()
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q.Add("domain-name", zoneName)
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q.Add("record-id", strconv.Itoa(recordID))
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reqURL.RawQuery = q.Encode()
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raw, err := c.doRequest(http.MethodPost, &reqURL)
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if err != nil {
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return err
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}
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resp := apiResponse{}
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if err = json.Unmarshal(raw, &resp); err != nil {
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return fmt.Errorf("apiResponse unmarshaling error: %w: %s", err, string(raw))
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}
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if resp.Status != "Success" {
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return fmt.Errorf("fail to add TXT record: %s %s", resp.Status, resp.StatusDescription)
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}
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return nil
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}
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func (c *Client) doRequest(method string, url *url.URL) (json.RawMessage, error) {
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req, err := c.buildRequest(method, url)
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if err != nil {
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return nil, err
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}
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resp, err := c.HTTPClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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content, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, errors.New(toUnreadableBodyMessage(req, content))
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}
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if resp.StatusCode != 200 {
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return nil, fmt.Errorf("invalid code (%v), error: %s", resp.StatusCode, content)
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}
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return content, nil
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}
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func (c *Client) buildRequest(method string, url *url.URL) (*http.Request, error) {
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q := url.Query()
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if c.subAuthID != "" {
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q.Add("sub-auth-id", c.subAuthID)
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} else {
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q.Add("auth-id", c.authID)
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}
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q.Add("auth-password", c.authPassword)
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url.RawQuery = q.Encode()
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req, err := http.NewRequest(method, url.String(), nil)
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if err != nil {
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return nil, fmt.Errorf("invalid request: %w", err)
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}
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return req, nil
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}
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func toUnreadableBodyMessage(req *http.Request, rawBody []byte) string {
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return fmt.Sprintf("the request %s sent a response with a body which is an invalid format: %q", req.URL, string(rawBody))
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}
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// Rounds the given TTL in seconds to the next accepted value.
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// Accepted TTL values are:
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// - 60 = 1 minute
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// - 300 = 5 minutes
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// - 900 = 15 minutes
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// - 1800 = 30 minutes
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// - 3600 = 1 hour
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// - 21600 = 6 hours
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// - 43200 = 12 hours
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// - 86400 = 1 day
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// - 172800 = 2 days
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// - 259200 = 3 days
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// - 604800 = 1 week
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// - 1209600 = 2 weeks
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// - 2592000 = 1 month
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// - 2592000 = 1 month
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// See https://www.cloudns.net/wiki/article/58/ for details.
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func ttlRounder(ttl int) int {
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for _, validTTL := range []int{60, 300, 900, 1800, 3600, 21600, 43200, 86400, 172800, 259200, 604800, 1209600} {
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if ttl <= validTTL {
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return validTTL
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}
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}
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return 2592000
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}
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