package acme import ( "bytes" "encoding/json" "log" "net/http" "net/textproto" "regexp" ) type NonceSigner interface { Sign([]byte) ([]byte, error) parseNonce(*http.Response) } func Get(s NonceSigner, uri string, v interface{}) error { resp, err := http.Get(uri) if err != nil { return err } defer resp.Body.Close() s.parseNonce(resp) return json.NewDecoder(resp.Body).Decode(v) } // Important header fields // // Replay-Nonce each response, required for next request // Link links to next stage // Retry-After pooling interval // Action Request Response // // Register POST new-reg 201 -> reg // Request challenges POST new-authz 201 -> authz // Answer challenges POST challenge 200 // Poll for status GET authz 200 // Request issuance POST new-cert 201 -> cert // Check for new cert GET cert 200 func Post(s NonceSigner, uri string, v interface{}) (*http.Response, error) { body, err := json.Marshal(v) if err != nil { return nil, err } signed, err := s.Sign(body) if err != nil { return nil, err } resp, err := http.Post(uri, "application/jose+json", bytes.NewReader(signed)) if err != nil { return nil, err } s.parseNonce(resp) if resp.StatusCode >= http.StatusBadRequest { return nil, handleError(resp) } log.Printf("%+v\n", parseLinks(resp)) return resp, nil } func parseLinks(r *http.Response) map[string]string { links := make(map[string]string) key := textproto.CanonicalMIMEHeaderKey("link") reg := regexp.MustCompile(`^<(.*)>;rel="(.*)"`) for _, l := range r.Header[key] { re := reg.FindStringSubmatch(l) if len(re) == 3 { links[re[2]] = re[1] } } return links }