Add placeholder middleware for guardian

guardian/guardian.go

@@ -0,0 +1,27 @@
+package guardian
+
+import (
+	"net/http"
+
+	"gitlab.com/mstarongitlab/linstrom/config"
+	"gitlab.com/mstarongitlab/linstrom/storage"
+)
+
+type GuardianMiddleware struct {
+	nextHandler http.Handler
+	config      *config.Config
+	storage     *storage.Storage
+}
+
+func NewMiddleware(nextHandler http.Handler, cfg *config.Config, s *storage.Storage) *GuardianMiddleware {
+	return &GuardianMiddleware{
+		nextHandler: nextHandler,
+		config:      cfg,
+		storage:     s,
+	}
+}
+
+func (gm *GuardianMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// TODO: Add guardian filtering stuff here, see Planka
+	gm.nextHandler.ServeHTTP(w, r)
+}