make default avatar use the avatars table

util.lua

@@ -34,9 +34,6 @@ util.TransientUser = {
 }
 
 function util.get_user_avatar_url(req, user)
-  if not user.avatar_id then
-    return "/avatars/default.webp"
-  end
   return Avatars:find(user.avatar_id).file_path
 end
 
@@ -72,6 +69,28 @@ function util.validate_and_create_image(input_image, filename)
   return true
 end
 
+function util.destroy_avatar(avatar_id)
+  if avatar_id == 1 then
+    print("won't delete default avatar")
+    return
+  end
+  
+  local avatar = Avatars:find(avatar_id)
+  
+  if not avatar then
+    return
+  end
+  
+  local file_path = "static" .. avatar.file_path
+  local f = io.open(file_path, "r")
+  if not f then
+    print("can't open avatar file")
+  else
+    f:close()
+    os.remove(file_path)
+  end
+end
+
 function util.get_logged_in_user(req)
   if req.session.session_key == nil then
     return nil