client.go raw

   1  package internal
   2  
   3  import (
   4  	"bytes"
   5  	"context"
   6  	"encoding/json"
   7  	"fmt"
   8  	"io"
   9  	"net/http"
  10  	"net/url"
  11  	"strconv"
  12  	"time"
  13  
  14  	"github.com/go-acme/lego/v4/challenge/dns01"
  15  	"github.com/go-acme/lego/v4/providers/dns/internal/errutils"
  16  	"golang.org/x/oauth2"
  17  )
  18  
  19  // DefaultBaseURL default API endpoint.
  20  const DefaultBaseURL = "https://api.digitalocean.com"
  21  
  22  // Client the Digital Ocean API client.
  23  type Client struct {
  24  	BaseURL    *url.URL
  25  	httpClient *http.Client
  26  }
  27  
  28  // NewClient creates a new Client.
  29  func NewClient(hc *http.Client) *Client {
  30  	baseURL, _ := url.Parse(DefaultBaseURL)
  31  
  32  	if hc == nil {
  33  		hc = &http.Client{Timeout: 5 * time.Second}
  34  	}
  35  
  36  	return &Client{BaseURL: baseURL, httpClient: hc}
  37  }
  38  
  39  func (c *Client) AddTxtRecord(ctx context.Context, zone string, record Record) (*TxtRecordResponse, error) {
  40  	endpoint := c.BaseURL.JoinPath("v2", "domains", dns01.UnFqdn(zone), "records")
  41  
  42  	req, err := newJSONRequest(ctx, http.MethodPost, endpoint, record)
  43  	if err != nil {
  44  		return nil, err
  45  	}
  46  
  47  	respData := &TxtRecordResponse{}
  48  
  49  	err = c.do(req, respData)
  50  	if err != nil {
  51  		return nil, err
  52  	}
  53  
  54  	return respData, nil
  55  }
  56  
  57  func (c *Client) RemoveTxtRecord(ctx context.Context, zone string, recordID int) error {
  58  	endpoint := c.BaseURL.JoinPath("v2", "domains", dns01.UnFqdn(zone), "records", strconv.Itoa(recordID))
  59  
  60  	req, err := newJSONRequest(ctx, http.MethodDelete, endpoint, nil)
  61  	if err != nil {
  62  		return err
  63  	}
  64  
  65  	return c.do(req, nil)
  66  }
  67  
  68  func (c *Client) do(req *http.Request, result any) error {
  69  	resp, err := c.httpClient.Do(req)
  70  	if err != nil {
  71  		return errutils.NewHTTPDoError(req, err)
  72  	}
  73  
  74  	defer func() { _ = resp.Body.Close() }()
  75  
  76  	if resp.StatusCode >= http.StatusBadRequest {
  77  		return parseError(req, resp)
  78  	}
  79  
  80  	if result == nil {
  81  		return nil
  82  	}
  83  
  84  	raw, err := io.ReadAll(resp.Body)
  85  	if err != nil {
  86  		return errutils.NewReadResponseError(req, resp.StatusCode, err)
  87  	}
  88  
  89  	err = json.Unmarshal(raw, result)
  90  	if err != nil {
  91  		return errutils.NewUnmarshalError(req, resp.StatusCode, raw, err)
  92  	}
  93  
  94  	return nil
  95  }
  96  
  97  func newJSONRequest(ctx context.Context, method string, endpoint *url.URL, payload any) (*http.Request, error) {
  98  	buf := new(bytes.Buffer)
  99  
 100  	if payload != nil {
 101  		err := json.NewEncoder(buf).Encode(payload)
 102  		if err != nil {
 103  			return nil, fmt.Errorf("failed to create request JSON body: %w", err)
 104  		}
 105  	}
 106  
 107  	req, err := http.NewRequestWithContext(ctx, method, endpoint.String(), buf)
 108  	if err != nil {
 109  		return nil, fmt.Errorf("unable to create request: %w", err)
 110  	}
 111  
 112  	req.Header.Set("Accept", "application/json")
 113  
 114  	// NOTE: Even though the body is empty, DigitalOcean API docs still show setting this Content-Type...
 115  	req.Header.Set("Content-Type", "application/json")
 116  
 117  	return req, nil
 118  }
 119  
 120  func parseError(req *http.Request, resp *http.Response) error {
 121  	raw, _ := io.ReadAll(resp.Body)
 122  
 123  	var errInfo APIError
 124  
 125  	err := json.Unmarshal(raw, &errInfo)
 126  	if err != nil {
 127  		return errutils.NewUnexpectedStatusCodeError(req, resp.StatusCode, raw)
 128  	}
 129  
 130  	return fmt.Errorf("[status code %d] %w", resp.StatusCode, errInfo)
 131  }
 132  
 133  func OAuthStaticAccessToken(client *http.Client, accessToken string) *http.Client {
 134  	if client == nil {
 135  		client = &http.Client{Timeout: 5 * time.Second}
 136  	}
 137  
 138  	client.Transport = &oauth2.Transport{
 139  		Source: oauth2.StaticTokenSource(&oauth2.Token{AccessToken: accessToken}),
 140  		Base:   client.Transport,
 141  	}
 142  
 143  	return client
 144  }
 145