Move code to pkg

pkg/provider/acme/challenge_http.go

@@ -0,0 +1,94 @@
+package acme
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/cenkalti/backoff"
+	"github.com/containous/mux"
+	"github.com/containous/traefik/pkg/log"
+	"github.com/containous/traefik/pkg/safe"
+	"github.com/go-acme/lego/challenge"
+	"github.com/go-acme/lego/challenge/http01"
+)
+
+var _ challenge.ProviderTimeout = (*challengeHTTP)(nil)
+
+type challengeHTTP struct {
+	Store Store
+}
+
+// Present presents a challenge to obtain new ACME certificate.
+func (c *challengeHTTP) Present(domain, token, keyAuth string) error {
+	return c.Store.SetHTTPChallengeToken(token, domain, []byte(keyAuth))
+}
+
+// CleanUp cleans the challenges when certificate is obtained.
+func (c *challengeHTTP) CleanUp(domain, token, keyAuth string) error {
+	return c.Store.RemoveHTTPChallengeToken(token, domain)
+}
+
+// Timeout calculates the maximum of time allowed to resolved an ACME challenge.
+func (c *challengeHTTP) Timeout() (timeout, interval time.Duration) {
+	return 60 * time.Second, 5 * time.Second
+}
+
+// Append adds routes on internal router
+func (p *Provider) Append(router *mux.Router) {
+	router.Methods(http.MethodGet).
+		Path(http01.ChallengePath("{token}")).
+		Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+			vars := mux.Vars(req)
+
+			ctx := log.With(context.Background(), log.Str(log.ProviderName, "acme"))
+			logger := log.FromContext(ctx)
+
+			if token, ok := vars["token"]; ok {
+				domain, _, err := net.SplitHostPort(req.Host)
+				if err != nil {
+					logger.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
+					domain = req.Host
+				}
+
+				tokenValue := getTokenValue(ctx, token, domain, p.Store)
+				if len(tokenValue) > 0 {
+					rw.WriteHeader(http.StatusOK)
+					_, err = rw.Write(tokenValue)
+					if err != nil {
+						logger.Errorf("Unable to write token: %v", err)
+					}
+					return
+				}
+			}
+			rw.WriteHeader(http.StatusNotFound)
+		}))
+}
+
+func getTokenValue(ctx context.Context, token, domain string, store Store) []byte {
+	logger := log.FromContext(ctx)
+	logger.Debugf("Retrieving the ACME challenge for token %v...", token)
+
+	var result []byte
+
+	operation := func() error {
+		var err error
+		result, err = store.GetHTTPChallengeToken(token, domain)
+		return err
+	}
+
+	notify := func(err error, time time.Duration) {
+		logger.Errorf("Error getting challenge for token retrying in %s", time)
+	}
+
+	ebo := backoff.NewExponentialBackOff()
+	ebo.MaxElapsedTime = 60 * time.Second
+	err := backoff.RetryNotify(safe.OperationWithRecover(operation), ebo, notify)
+	if err != nil {
+		logger.Errorf("Cannot retrieve the ACME challenge for token %v: %v", token, err)
+		return []byte{}
+	}
+
+	return result
+}