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package acme

import (
	"errors"
	"net/http"
)

var errNoNonces = errors.New("No nonces available")

type nonce chan string

func (n nonce) parse(r *http.Response) {
	if nonce := r.Header.Get("Replay-Nonce"); nonce != "" {
		n <- nonce
	}
}

// Nonce implements jose nonce provider
func (n nonce) Nonce() (string, error) {
	if nonce, ok := <-n; ok {
		return nonce, nil
	}
	return "", errNoNonces
}