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  )
  17  
  18  const defaultBaseURL = "https://api.ukfast.io/safedns/v1"
  19  
  20  const authorizationHeader = "Authorization"
  21  
  22  // Client the UKFast SafeDNS client.
  23  type Client struct {
  24  	authToken string
  25  
  26  	baseURL    *url.URL
  27  	HTTPClient *http.Client
  28  }
  29  
  30  // NewClient Creates a new Client.
  31  func NewClient(authToken string) *Client {
  32  	baseURL, _ := url.Parse(defaultBaseURL)
  33  
  34  	return &Client{
  35  		authToken:  authToken,
  36  		baseURL:    baseURL,
  37  		HTTPClient: &http.Client{Timeout: 5 * time.Second},
  38  	}
  39  }
  40  
  41  // AddRecord adds a DNS record.
  42  func (c *Client) AddRecord(ctx context.Context, zone string, record Record) (*AddRecordResponse, error) {
  43  	endpoint := c.baseURL.JoinPath("zones", dns01.UnFqdn(zone), "records")
  44  
  45  	req, err := newJSONRequest(ctx, http.MethodPost, endpoint, record)
  46  	if err != nil {
  47  		return nil, err
  48  	}
  49  
  50  	respData := &AddRecordResponse{}
  51  
  52  	err = c.do(req, respData)
  53  	if err != nil {
  54  		return nil, fmt.Errorf("add record: %w", err)
  55  	}
  56  
  57  	return respData, nil
  58  }
  59  
  60  // RemoveRecord removes a DNS record.
  61  func (c *Client) RemoveRecord(ctx context.Context, zone string, recordID int) error {
  62  	endpoint := c.baseURL.JoinPath("zones", dns01.UnFqdn(zone), "records", strconv.Itoa(recordID))
  63  
  64  	req, err := newJSONRequest(ctx, http.MethodDelete, endpoint, nil)
  65  	if err != nil {
  66  		return err
  67  	}
  68  
  69  	err = c.do(req, nil)
  70  	if err != nil {
  71  		return fmt.Errorf("remove record: %w", err)
  72  	}
  73  
  74  	return nil
  75  }
  76  
  77  func (c *Client) do(req *http.Request, result any) error {
  78  	req.Header.Set(authorizationHeader, c.authToken)
  79  
  80  	resp, err := c.HTTPClient.Do(req)
  81  	if err != nil {
  82  		return errutils.NewHTTPDoError(req, err)
  83  	}
  84  
  85  	defer func() { _ = resp.Body.Close() }()
  86  
  87  	if resp.StatusCode/100 != 2 {
  88  		return parseError(req, resp)
  89  	}
  90  
  91  	if result == nil {
  92  		return nil
  93  	}
  94  
  95  	raw, err := io.ReadAll(resp.Body)
  96  	if err != nil {
  97  		return errutils.NewReadResponseError(req, resp.StatusCode, err)
  98  	}
  99  
 100  	err = json.Unmarshal(raw, result)
 101  	if err != nil {
 102  		return errutils.NewUnmarshalError(req, resp.StatusCode, raw, err)
 103  	}
 104  
 105  	return nil
 106  }
 107  
 108  func newJSONRequest(ctx context.Context, method string, endpoint *url.URL, payload any) (*http.Request, error) {
 109  	buf := new(bytes.Buffer)
 110  
 111  	if payload != nil {
 112  		err := json.NewEncoder(buf).Encode(payload)
 113  		if err != nil {
 114  			return nil, fmt.Errorf("failed to create request JSON body: %w", err)
 115  		}
 116  	}
 117  
 118  	req, err := http.NewRequestWithContext(ctx, method, endpoint.String(), buf)
 119  	if err != nil {
 120  		return nil, fmt.Errorf("unable to create request: %w", err)
 121  	}
 122  
 123  	req.Header.Set("Accept", "application/json")
 124  
 125  	if payload != nil {
 126  		req.Header.Set("Content-Type", "application/json")
 127  	}
 128  
 129  	return req, nil
 130  }
 131  
 132  func parseError(req *http.Request, resp *http.Response) error {
 133  	raw, _ := io.ReadAll(resp.Body)
 134  
 135  	var errAPI APIError
 136  
 137  	err := json.Unmarshal(raw, &errAPI)
 138  	if err != nil {
 139  		return errutils.NewUnexpectedStatusCodeError(req, resp.StatusCode, raw)
 140  	}
 141  
 142  	return fmt.Errorf("[status code: %d] %w", resp.StatusCode, errAPI)
 143  }
 144