Display owner group names on failed interaction

api.lua

@@ -87,11 +87,24 @@ end
 function areas:getNodeOwners(pos)
 	local owners = {}
 	for _, area in pairs(self:getAreasAtPos(pos)) do
-		table.insert(owners, area.owner)
+    if area.owner and (area.owner ~= "") then
+      table.insert(owners, area.owner)
+    end
 	end
 	return owners
 end
 
+-- Returns a table (list) of all groups that own an area
+function areas:getNodeOwnerGroups(pos)
+  local ownerGroups = {}
+  for _, area in pairs(self:getAreasAtPos(pos)) do
+    if area.group then
+      table.insert(ownerGroups, area.group)
+    end
+  end
+  return ownerGroups
+end
+
 --- Checks if the area intersects with an area that the player can't interact in.
 -- Note that this fails and returns false when the specified area is fully
 -- owned by the player, but with multiple protection zones, none of which

interact.lua

@@ -1,4 +1,3 @@
-
 local old_is_protected = minetest.is_protected
 function minetest.is_protected(pos, name)
 	if not areas:canInteract(pos, name) then
@@ -10,6 +9,11 @@ end
 minetest.register_on_protection_violation(function(pos, name)
 	if not areas:canInteract(pos, name) then
 		local owners = areas:getNodeOwners(pos)
+
+    if not owners[1] then
+      owners = areas:getNodeOwnerGroups(pos)
+    end
+
 		minetest.chat_send_player(name,
 			("%s is protected by %s."):format(
 				minetest.pos_to_string(pos),