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package acme

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

	"github.com/square/go-jose"
)

type Signer interface {
	Sign([]byte) ([]byte, error)
}

var nonces = newNonce()

func Get(uri string, v interface{}) error {
	resp, err := http.Get(uri)
	if err != nil {
		return err
	}
	defer resp.Body.Close()
	nonces.parse(resp)
	return json.NewDecoder(resp.Body).Decode(v)
}

// Important header fields
// Replay-Nonce		each request
// Link			links to next stage
// Retry-After		pooling interval

func Post(s Signer, 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
	}
	nonces.parse(resp)
	log.Printf("%+v\n", parseLinks(resp))

	if resp.StatusCode >= http.StatusBadRequest {
		return nil, handleError(resp)
	}

	return resp, nil
}

func Sign(acc Account, body []byte) (string, error) {
	signer, err := jose.NewSigner(jose.RS256, acc.PrivKey)
	signer.SetNonceSource(nonces)
	if err != nil {
		return "", err
	}
	obj, err := signer.Sign(body)
	if err != nil {
		return "", err
	}
	return obj.FullSerialize(), 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
}