Created package "calls" and verification for frontend and calls

cmd/frontend/images.go

@@ -10,6 +10,10 @@ import (
 
 func ServeImage(c *b.Config, s *b.CookieStore) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		if _, err := getSession(w, r, c, s); err != nil {
+			return
+		}
+
 		absFilepath, err := filepath.Abs(c.PicsDir)
 		if err != nil {
 			log.Println(err)