lego/acme/api/api.go

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2019-03-11 16:56:48 +00:00
package api
import (
"bytes"
"context"
"crypto"
"encoding/json"
"errors"
"fmt"
"net/http"
"time"
"github.com/cenkalti/backoff/v4"
"github.com/go-acme/lego/v3/acme"
"github.com/go-acme/lego/v3/acme/api/internal/nonces"
"github.com/go-acme/lego/v3/acme/api/internal/secure"
"github.com/go-acme/lego/v3/acme/api/internal/sender"
"github.com/go-acme/lego/v3/log"
)
// Core ACME/LE core API.
type Core struct {
doer *sender.Doer
nonceManager *nonces.Manager
jws *secure.JWS
directory acme.Directory
HTTPClient *http.Client
common service // Reuse a single struct instead of allocating one for each service on the heap.
Accounts *AccountService
Authorizations *AuthorizationService
Certificates *CertificateService
Challenges *ChallengeService
Orders *OrderService
}
// New Creates a new Core.
func New(httpClient *http.Client, userAgent string, caDirURL, kid string, privateKey crypto.PrivateKey) (*Core, error) {
doer := sender.NewDoer(httpClient, userAgent)
dir, err := getDirectory(doer, caDirURL)
if err != nil {
return nil, err
}
nonceManager := nonces.NewManager(doer, dir.NewNonceURL)
jws := secure.NewJWS(privateKey, kid, nonceManager)
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c := &Core{doer: doer, nonceManager: nonceManager, jws: jws, directory: dir, HTTPClient: httpClient}
c.common.core = c
c.Accounts = (*AccountService)(&c.common)
c.Authorizations = (*AuthorizationService)(&c.common)
c.Certificates = (*CertificateService)(&c.common)
c.Challenges = (*ChallengeService)(&c.common)
c.Orders = (*OrderService)(&c.common)
return c, nil
}
// post performs an HTTP POST request and parses the response body as JSON,
// into the provided respBody object.
func (a *Core) post(uri string, reqBody, response interface{}) (*http.Response, error) {
content, err := json.Marshal(reqBody)
if err != nil {
return nil, errors.New("failed to marshal message")
}
return a.retrievablePost(uri, content, response)
}
// postAsGet performs an HTTP POST ("POST-as-GET") request.
// https://tools.ietf.org/html/rfc8555#section-6.3
func (a *Core) postAsGet(uri string, response interface{}) (*http.Response, error) {
return a.retrievablePost(uri, []byte{}, response)
}
func (a *Core) retrievablePost(uri string, content []byte, response interface{}) (*http.Response, error) {
// during tests, allow to support ~90% of bad nonce with a minimum of attempts.
bo := backoff.NewExponentialBackOff()
bo.InitialInterval = 200 * time.Millisecond
bo.MaxInterval = 5 * time.Second
bo.MaxElapsedTime = 20 * time.Second
ctx, cancel := context.WithCancel(context.Background())
var resp *http.Response
operation := func() error {
var err error
resp, err = a.signedPost(uri, content, response)
if err != nil {
switch err.(type) {
// Retry if the nonce was invalidated
case *acme.NonceError:
return err
default:
cancel()
return err
}
}
return nil
}
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notify := func(err error, duration time.Duration) {
log.Infof("retry due to: %v", err)
}
err := backoff.RetryNotify(operation, backoff.WithContext(bo, ctx), notify)
if err != nil {
return nil, err
}
return resp, nil
}
func (a *Core) signedPost(uri string, content []byte, response interface{}) (*http.Response, error) {
signedContent, err := a.jws.SignContent(uri, content)
if err != nil {
return nil, fmt.Errorf("failed to post JWS message -> failed to sign content -> %v", err)
}
signedBody := bytes.NewBuffer([]byte(signedContent.FullSerialize()))
resp, err := a.doer.Post(uri, signedBody, "application/jose+json", response)
// nonceErr is ignored to keep the root error.
nonce, nonceErr := nonces.GetFromResponse(resp)
if nonceErr == nil {
a.nonceManager.Push(nonce)
}
return resp, err
}
func (a *Core) signEABContent(newAccountURL, kid string, hmac []byte) ([]byte, error) {
eabJWS, err := a.jws.SignEABContent(newAccountURL, kid, hmac)
if err != nil {
return nil, err
}
return []byte(eabJWS.FullSerialize()), nil
}
// GetKeyAuthorization Gets the key authorization
func (a *Core) GetKeyAuthorization(token string) (string, error) {
return a.jws.GetKeyAuthorization(token)
}
func (a *Core) GetDirectory() acme.Directory {
return a.directory
}
func getDirectory(do *sender.Doer, caDirURL string) (acme.Directory, error) {
var dir acme.Directory
if _, err := do.Get(caDirURL, &dir); err != nil {
return dir, fmt.Errorf("get directory at '%s': %v", caDirURL, err)
}
if dir.NewAccountURL == "" {
return dir, errors.New("directory missing new registration URL")
}
if dir.NewOrderURL == "" {
return dir, errors.New("directory missing new order URL")
}
return dir, nil
}