1 files changed, 42 insertions, 0 deletions
diff --git a/core/https/handler.go b/core/https/handler.go
new file mode 100644
index 000000000..f3139f54e
--- /dev/null
+++ b/core/https/handler.go
@@ -0,0 +1,42 @@
+package https
+
+import (
+	"crypto/tls"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+)
+
+const challengeBasePath = "/.well-known/acme-challenge"
+
+// RequestCallback proxies challenge requests to ACME client if the
+// request path starts with challengeBasePath. It returns true if it
+// handled the request and no more needs to be done; it returns false
+// if this call was a no-op and the request still needs handling.
+func RequestCallback(w http.ResponseWriter, r *http.Request) bool {
+	if strings.HasPrefix(r.URL.Path, challengeBasePath) {
+		scheme := "http"
+		if r.TLS != nil {
+			scheme = "https"
+		}
+
+		upstream, err := url.Parse(scheme + "://localhost:" + AlternatePort)
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			log.Printf("[ERROR] ACME proxy handler: %v", err)
+			return true
+		}
+
+		proxy := httputil.NewSingleHostReverseProxy(upstream)
+		proxy.Transport = &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, // solver uses self-signed certs
+		}
+		proxy.ServeHTTP(w, r)
+
+		return true
+	}
+
+	return false
+}