145 lines
3.6 KiB
Go
145 lines
3.6 KiB
Go
package sender
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import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"runtime"
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"strings"
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"github.com/go-acme/lego/v3/acme"
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)
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type RequestOption func(*http.Request) error
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func contentType(ct string) RequestOption {
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return func(req *http.Request) error {
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req.Header.Set("Content-Type", ct)
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return nil
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}
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}
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type Doer struct {
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httpClient *http.Client
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userAgent string
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}
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// NewDoer Creates a new Doer.
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func NewDoer(client *http.Client, userAgent string) *Doer {
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return &Doer{
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httpClient: client,
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userAgent: userAgent,
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}
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}
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// Get performs a GET request with a proper User-Agent string.
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// If "response" is not provided, callers should close resp.Body when done reading from it.
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func (d *Doer) Get(url string, response interface{}) (*http.Response, error) {
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req, err := d.newRequest(http.MethodGet, url, nil)
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if err != nil {
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return nil, err
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}
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return d.do(req, response)
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}
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// Head performs a HEAD request with a proper User-Agent string.
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// The response body (resp.Body) is already closed when this function returns.
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func (d *Doer) Head(url string) (*http.Response, error) {
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req, err := d.newRequest(http.MethodHead, url, nil)
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if err != nil {
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return nil, err
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}
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return d.do(req, nil)
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}
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// Post performs a POST request with a proper User-Agent string.
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// If "response" is not provided, callers should close resp.Body when done reading from it.
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func (d *Doer) Post(url string, body io.Reader, bodyType string, response interface{}) (*http.Response, error) {
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req, err := d.newRequest(http.MethodPost, url, body, contentType(bodyType))
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if err != nil {
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return nil, err
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}
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return d.do(req, response)
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}
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func (d *Doer) newRequest(method, uri string, body io.Reader, opts ...RequestOption) (*http.Request, error) {
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req, err := http.NewRequest(method, uri, body)
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if err != nil {
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return nil, fmt.Errorf("failed to create request: %v", err)
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}
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req.Header.Set("User-Agent", d.formatUserAgent())
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for _, opt := range opts {
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err = opt(req)
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if err != nil {
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return nil, fmt.Errorf("failed to create request: %v", err)
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}
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}
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return req, nil
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}
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func (d *Doer) do(req *http.Request, response interface{}) (*http.Response, error) {
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resp, err := d.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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if err = checkError(req, resp); err != nil {
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return resp, err
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}
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if response != nil {
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raw, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return resp, err
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}
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defer resp.Body.Close()
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err = json.Unmarshal(raw, response)
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if err != nil {
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return resp, fmt.Errorf("failed to unmarshal %q to type %T: %v", raw, response, err)
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}
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}
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return resp, nil
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}
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// formatUserAgent builds and returns the User-Agent string to use in requests.
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func (d *Doer) formatUserAgent() string {
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ua := fmt.Sprintf("%s %s (%s; %s; %s)", d.userAgent, ourUserAgent, ourUserAgentComment, runtime.GOOS, runtime.GOARCH)
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return strings.TrimSpace(ua)
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}
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func checkError(req *http.Request, resp *http.Response) error {
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if resp.StatusCode >= http.StatusBadRequest {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return fmt.Errorf("%d :: %s :: %s :: %v", resp.StatusCode, req.Method, req.URL, err)
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}
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var errorDetails *acme.ProblemDetails
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err = json.Unmarshal(body, &errorDetails)
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if err != nil {
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return fmt.Errorf("%d ::%s :: %s :: %v :: %s", resp.StatusCode, req.Method, req.URL, err, string(body))
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}
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errorDetails.Method = req.Method
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errorDetails.URL = req.URL.String()
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// Check for errors we handle specifically
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if errorDetails.HTTPStatus == http.StatusBadRequest && errorDetails.Type == acme.BadNonceErr {
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return &acme.NonceError{ProblemDetails: errorDetails}
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}
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return errorDetails
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}
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return nil
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}
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