141 lines
3.3 KiB
Go
141 lines
3.3 KiB
Go
package internal
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import (
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"context"
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"crypto/sha1"
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"encoding/json"
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"fmt"
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"io"
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"math/rand"
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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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"time"
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"github.com/go-acme/lego/v4/challenge/dns01"
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"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
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querystring "github.com/google/go-querystring/query"
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)
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const apiURL = "https://api.nearlyfreespeech.net"
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const authenticationHeader = "X-NFSN-Authentication"
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const saltBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
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type Client struct {
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login string
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apiKey string
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signer *Signer
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baseURL *url.URL
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HTTPClient *http.Client
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}
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func NewClient(login string, apiKey string) *Client {
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baseURL, _ := url.Parse(apiURL)
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return &Client{
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login: login,
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apiKey: apiKey,
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signer: NewSigner(),
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baseURL: baseURL,
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HTTPClient: &http.Client{Timeout: 10 * time.Second},
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}
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}
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func (c Client) AddRecord(ctx context.Context, domain string, record Record) error {
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endpoint := c.baseURL.JoinPath("dns", dns01.UnFqdn(domain), "addRR")
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params, err := querystring.Values(record)
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if err != nil {
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return err
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}
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return c.doRequest(ctx, endpoint, params)
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}
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func (c Client) RemoveRecord(ctx context.Context, domain string, record Record) error {
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endpoint := c.baseURL.JoinPath("dns", dns01.UnFqdn(domain), "removeRR")
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params, err := querystring.Values(record)
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if err != nil {
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return err
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}
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return c.doRequest(ctx, endpoint, params)
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}
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func (c Client) doRequest(ctx context.Context, endpoint *url.URL, params url.Values) error {
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payload := params.Encode()
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, endpoint.String(), strings.NewReader(payload))
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if err != nil {
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return fmt.Errorf("unable to create request: %w", err)
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}
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req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
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req.Header.Set(authenticationHeader, c.signer.Sign(endpoint.Path, payload, c.login, c.apiKey))
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resp, err := c.HTTPClient.Do(req)
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if err != nil {
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return errutils.NewHTTPDoError(req, err)
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return parseError(req, resp)
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}
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return nil
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}
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func parseError(req *http.Request, resp *http.Response) error {
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raw, _ := io.ReadAll(resp.Body)
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errAPI := &APIError{}
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err := json.Unmarshal(raw, errAPI)
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if err != nil {
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return errutils.NewUnexpectedStatusCodeError(req, resp.StatusCode, raw)
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}
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return errAPI
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}
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type Signer struct {
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saltShaker func() []byte
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clock func() time.Time
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}
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func NewSigner() *Signer {
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return &Signer{saltShaker: getRandomSalt, clock: time.Now}
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}
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func (c Signer) Sign(uri string, body, login, apiKey string) string {
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// Header is "login;timestamp;salt;hash".
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// hash is SHA1("login;timestamp;salt;api-key;request-uri;body-hash")
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// and body-hash is SHA1(body).
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bodyHash := sha1.Sum([]byte(body))
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timestamp := strconv.FormatInt(c.clock().Unix(), 10)
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// Workaround for https://golang.org/issue/58605
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uri = "/" + strings.TrimLeft(uri, "/")
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hashInput := fmt.Sprintf("%s;%s;%s;%s;%s;%02x", login, timestamp, c.saltShaker(), apiKey, uri, bodyHash)
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return fmt.Sprintf("%s;%s;%s;%02x", login, timestamp, c.saltShaker(), sha1.Sum([]byte(hashInput)))
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}
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func getRandomSalt() []byte {
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// This is the only part of this that needs to be serialized.
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salt := make([]byte, 16)
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for i := 0; i < 16; i++ {
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salt[i] = saltBytes[rand.Intn(len(saltBytes))]
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}
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return salt
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}
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