Add middleware to read X-Forwarded-Proto header

daemon/routes.go

@@ -39,6 +39,7 @@ func routes(cfg *config.Config, store *storage.Storage, feedHandler *feed.Handle
 		router = router.PathPrefix(cfg.BasePath()).Subrouter()
 	}
 
+	router.Use(middleware.HeaderConfig)
 	router.Use(middleware.Logging)
 
 	router.HandleFunc("/healthcheck", func(w http.ResponseWriter, r *http.Request) {

http/handler/handler.go

@@ -34,10 +34,6 @@ func (h *Handler) Use(f ControllerFunc) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		defer timer.ExecutionTime(time.Now(), r.URL.Path)
 
-		if r.Header.Get("X-Forwarded-Proto") == "https" {
-			h.cfg.IsHTTPS = true
-		}
-
 		ctx := NewContext(r, h.store, h.router, h.translator)
 		request := NewRequest(r)
 		response := NewResponse(h.cfg, w, r, h.template)

middleware/header_config.go

@@ -0,0 +1,19 @@
+// Copyright 2018 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package middleware
+
+import (
+	"net/http"
+)
+
+// HeaderConfig changes config values according to HTTP headers.
+func (m *Middleware) HeaderConfig(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Header.Get("X-Forwarded-Proto") == "https" {
+			m.cfg.IsHTTPS = true
+		}
+		next.ServeHTTP(w, r)
+	})
+}