Add `mcl_player_csm` mod to check if a player have the official CSM enabled

mods/PLAYER/mcl_player_csm/init.lua

@@ -0,0 +1,37 @@
+mcl_player_csm = {}
+
+---@type table<string, boolean>
+local activated = {}
+
+---Return whatever player with specified name have official CSM enabled
+---@param name string
+---@return boolean? # `nil` if player not found, boolean overwise
+function mcl_player_csm.is_enabled(name)
+	return activated[name]
+end
+
+minetest.mod_channel_join("mcl_player_csm:activate")
+
+minetest.register_on_modchannel_message(function(channel_name, sender, message)
+	if channel_name == "mcl_player_csm:activate" and message == "activated" then
+		activated[sender] = true
+	end
+end)
+
+minetest.register_on_joinplayer(function(player, last_login)
+	activated[player:get_player_name()] = false
+end)
+
+minetest.register_on_leaveplayer(function(player, timed_out)
+	activated[player:get_player_name()] = nil
+end)
+
+minetest.register_chatcommand("have_csm", {
+	description = "Show whatever player have official CSM enabled",
+	params = "[<name>]",
+	privs = {debug = true},
+	func = function(name, param)
+		local pname = param ~= "" and param or name
+		return true, "Player [" .. pname .. "]: " .. tostring(activated[pname])
+	end
+})

mods/PLAYER/mcl_player_csm/mod.conf

@@ -0,0 +1,5 @@
+name = mcl_player_csm
+description = 
+depends = 
+optional_depends = 
+author = AFCM