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package acme

import (
	"bytes"
	"encoding/json"
	"log"
	"net/http"
	"net/textproto"
	"regexp"
)

type NonceSigner interface {
	Sign([]byte) ([]byte, error)
	parseNonce(*http.Response)
}

// Get is used for
// directory, authz, cert
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

// Post is used for
// new-reg, new-authz, challenge, new-cert
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
}

type Links map[string]string

func parseLinks(r *http.Response) Links {
	links := make(Links)
	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
}