ACME TLS ALPN

provider/acme/challenge_http.go

@@ -0,0 +1,125 @@
+package acme
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/cenk/backoff"
+	"github.com/containous/mux"
+	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/safe"
+	"github.com/xenolf/lego/acme"
+)
+
+var _ acme.ChallengeProviderTimeout = (*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 {
+	httpChallenges, err := c.Store.GetHTTPChallenges()
+	if err != nil {
+		return fmt.Errorf("unable to get HTTPChallenges : %s", err)
+	}
+
+	if httpChallenges == nil {
+		httpChallenges = map[string]map[string][]byte{}
+	}
+
+	if _, ok := httpChallenges[token]; !ok {
+		httpChallenges[token] = map[string][]byte{}
+	}
+
+	httpChallenges[token][domain] = []byte(keyAuth)
+
+	return c.Store.SaveHTTPChallenges(httpChallenges)
+}
+
+// CleanUp cleans the challenges when certificate is obtained
+func (c *challengeHTTP) CleanUp(domain, token, keyAuth string) error {
+	httpChallenges, err := c.Store.GetHTTPChallenges()
+	if err != nil {
+		return fmt.Errorf("unable to get HTTPChallenges : %s", err)
+	}
+
+	log.Debugf("Challenge CleanUp for domain %s", domain)
+
+	if _, ok := httpChallenges[token]; ok {
+		if _, domainOk := httpChallenges[token][domain]; domainOk {
+			delete(httpChallenges[token], domain)
+		}
+		if len(httpChallenges[token]) == 0 {
+			delete(httpChallenges, token)
+		}
+		return c.Store.SaveHTTPChallenges(httpChallenges)
+	}
+	return nil
+}
+
+// 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
+}
+
+func getTokenValue(token, domain string, store Store) []byte {
+	log.Debugf("Looking for an existing ACME challenge for token %v...", token)
+	var result []byte
+
+	operation := func() error {
+		httpChallenges, err := store.GetHTTPChallenges()
+		if err != nil {
+			return fmt.Errorf("HTTPChallenges not available : %s", err)
+		}
+
+		var ok bool
+		if result, ok = httpChallenges[token][domain]; !ok {
+			return fmt.Errorf("cannot find challenge for token %v", token)
+		}
+		return nil
+	}
+
+	notify := func(err error, time time.Duration) {
+		log.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 {
+		log.Errorf("Error getting challenge for token: %v", err)
+		return []byte{}
+	}
+
+	return result
+}
+
+// AddRoutes add routes on internal router
+func (p *Provider) AddRoutes(router *mux.Router) {
+	router.Methods(http.MethodGet).
+		Path(acme.HTTP01ChallengePath("{token}")).
+		Handler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+			vars := mux.Vars(req)
+			if token, ok := vars["token"]; ok {
+				domain, _, err := net.SplitHostPort(req.Host)
+				if err != nil {
+					log.Debugf("Unable to split host and port: %v. Fallback to request host.", err)
+					domain = req.Host
+				}
+
+				tokenValue := getTokenValue(token, domain, p.Store)
+				if len(tokenValue) > 0 {
+					rw.WriteHeader(http.StatusOK)
+					_, err = rw.Write(tokenValue)
+					if err != nil {
+						log.Errorf("Unable to write token : %v", err)
+					}
+					return
+				}
+			}
+			rw.WriteHeader(http.StatusNotFound)
+		}))
+}