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client.go
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client.go
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package internal
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"sync"
"time"
"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
)
// Default API endpoints.
const (
APIBaseURL = "https://api.mythic-beasts.com/dns/v2"
AuthBaseURL = "https://auth.mythic-beasts.com/login"
)
// Client the Mythic Beasts API client.
type Client struct {
username string
password string
APIEndpoint *url.URL
AuthEndpoint *url.URL
HTTPClient *http.Client
token *Token
muToken sync.Mutex
}
// NewClient Creates a new Client.
func NewClient(username string, password string) *Client {
apiEndpoint, _ := url.Parse(APIBaseURL)
authEndpoint, _ := url.Parse(AuthBaseURL)
return &Client{
username: username,
password: password,
APIEndpoint: apiEndpoint,
AuthEndpoint: authEndpoint,
HTTPClient: &http.Client{Timeout: 5 * time.Second},
}
}
// CreateTXTRecord creates a TXT record.
// https://www.mythic-beasts.com/support/api/dnsv2#ep-get-zoneszonerecords
func (c *Client) CreateTXTRecord(ctx context.Context, zone, leaf, value string, ttl int) error {
resp, err := c.createTXTRecord(ctx, zone, leaf, "TXT", value, ttl)
if err != nil {
return err
}
if resp.Added != 1 {
return fmt.Errorf("did not add TXT record for some reason: %s", resp.Message)
}
// Success
return nil
}
// RemoveTXTRecord removes a TXT records.
// https://www.mythic-beasts.com/support/api/dnsv2#ep-delete-zoneszonerecords
func (c *Client) RemoveTXTRecord(ctx context.Context, zone, leaf, value string) error {
resp, err := c.removeTXTRecord(ctx, zone, leaf, "TXT", value)
if err != nil {
return err
}
if resp.Removed != 1 {
return fmt.Errorf("did not remove TXT record for some reason: %s", resp.Message)
}
// Success
return nil
}
// https://www.mythic-beasts.com/support/api/dnsv2#ep-post-zoneszonerecords
func (c *Client) createTXTRecord(ctx context.Context, zone, leaf, recordType, value string, ttl int) (*createTXTResponse, error) {
endpoint := c.APIEndpoint.JoinPath("zones", zone, "records", leaf, recordType)
createReq := createTXTRequest{
Records: []createTXTRecord{{
Host: leaf,
TTL: ttl,
Type: "TXT",
Data: value,
}},
}
req, err := newJSONRequest(ctx, http.MethodPost, endpoint, createReq)
if err != nil {
return nil, err
}
resp := &createTXTResponse{}
err = c.do(req, resp)
if err != nil {
return nil, err
}
return resp, nil
}
// https://www.mythic-beasts.com/support/api/dnsv2#ep-delete-zoneszonerecords
func (c *Client) removeTXTRecord(ctx context.Context, zone, leaf, recordType, value string) (*deleteTXTResponse, error) {
endpoint := c.APIEndpoint.JoinPath("zones", zone, "records", leaf, recordType)
query := endpoint.Query()
query.Add("data", value)
endpoint.RawQuery = query.Encode()
req, err := newJSONRequest(ctx, http.MethodDelete, endpoint, nil)
if err != nil {
return nil, err
}
resp := &deleteTXTResponse{}
err = c.do(req, resp)
if err != nil {
return nil, err
}
return resp, nil
}
func (c *Client) do(req *http.Request, result any) error {
tok := getToken(req.Context())
if tok != nil {
req.Header.Set("Authorization", "Bearer "+tok.Token)
} else {
return fmt.Errorf("not logged in")
}
resp, err := c.HTTPClient.Do(req)
if err != nil {
return errutils.NewHTTPDoError(req, err)
}
defer func() { _ = resp.Body.Close() }()
if resp.StatusCode != http.StatusOK {
return errutils.NewUnexpectedResponseStatusCodeError(req, resp)
}
raw, err := io.ReadAll(resp.Body)
if err != nil {
return errutils.NewReadResponseError(req, resp.StatusCode, err)
}
err = json.Unmarshal(raw, result)
if err != nil {
return errutils.NewUnmarshalError(req, resp.StatusCode, raw, err)
}
return nil
}
func newJSONRequest(ctx context.Context, method string, endpoint *url.URL, payload any) (*http.Request, error) {
buf := new(bytes.Buffer)
if payload != nil {
err := json.NewEncoder(buf).Encode(payload)
if err != nil {
return nil, fmt.Errorf("failed to create request JSON body: %w", err)
}
}
req, err := http.NewRequestWithContext(ctx, method, endpoint.String(), buf)
if err != nil {
return nil, fmt.Errorf("unable to create request: %w", err)
}
req.Header.Set("Accept", "application/json")
if payload != nil {
req.Header.Set("Content-Type", "application/json")
}
return req, nil
}