Use vanilla HTTP handlers (refactoring)

middleware/common_headers.go

@@ -0,0 +1,25 @@
+// 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"
+)
+
+// CommonHeaders sends common HTTP headers.
+func (m *Middleware) CommonHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-XSS-Protection", "1; mode=block")
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+		w.Header().Set("X-Frame-Options", "DENY")
+		w.Header().Set("Content-Security-Policy", "default-src 'self'; img-src *; media-src *; frame-src *; child-src *")
+
+		if m.cfg.IsHTTPS && m.cfg.HasHSTS() {
+			w.Header().Set("Strict-Transport-Security", "max-age=31536000")
+		}
+
+		next.ServeHTTP(w, r)
+	})
+}