oldplayer/init.lua

-- OLD PLAYER : keep only serious players data on server
--(c) 2015-2016 rnd
--
-- modified by SaKeL for Survival X server
-- - Linux support
-- - Protector (redo) support (@todo)

oldplayer = {}

-- SETTINGS 
oldplayer.requirement = { "default:stick 1", "default:steel_ingot 1" }
oldplayer.welcome = "*** IMPORTANT *** Hi new player, please have at least 1 STICK and 1 STEEL INGOT in your inventory when leaving the game to register as serious player. If not, your player data will be deleted!"

-- CORE 
oldplayer.players = {}
local worldpath = minetest.get_worldpath()


minetest.register_on_joinplayer(function(player)
	local name = player:get_player_name()
	if name == nil then return end
	
	-- read player inventory data
	local inv = player:get_inventory()
	local isoldplayer = inv:get_stack("oldplayer", 1):get_count()
	inv:set_size("oldplayer", 2)

	local ip = minetest.get_player_ip(name)
	if not ip then return end

	inv:set_stack("oldplayer", 2, ItemStack("IP".. ip)) -- string.gsub(ip,".","_")));
	
	if isoldplayer > 0 then
		oldplayer.players[name] = 1
		minetest.chat_send_player(name, "<SERVER> Welcome back, have fun!")

	else
		local privs = minetest.get_player_privs(name)

		if privs.kick then
			inv:set_stack("oldplayer", 1, ItemStack("oldplayer"))
			minetest.chat_send_player(name, "<SERVER> Welcome moderator. Will remember you as an old player and will not remove your player data. Have fun!")
			oldplayer.players[name] = 1
		else
			oldplayer.players[name] = 0
			local form = "size [6,2] textarea[0,0;6.6,3.5;help;WELCOME TO SURVIVAL X SERVER;".. oldplayer.welcome.."]"
			minetest.show_formspec(name, "oldplayer:welcome", form)
	--		minetest.chat_send_player(name, oldplayer.welcome)
		end
	end
end)

minetest.register_on_leaveplayer(function(player, timed_out)
	local name = player:get_player_name()
	if name == nil then return end

	if oldplayer.players[name] == 1 then return end -- already old, do nothing

	local delete = false -- should we delete player?
	
	-- read player inventory data
	local inv = player:get_inventory()

	-- does player have all the required items in inventory?
	for _,item in pairs(oldplayer.requirement) do
		if not inv:contains_item("main", item)	then 
			delete = true
		end
	end
	
	if not delete then -- set up oldplayer inventory so we know player is old next time
		inv:set_size("oldplayer", 2)
		inv:set_stack("oldplayer", 1, ItemStack("oldplayer"))

	else -- delete player profile
		local filename = worldpath.."/players/"..name
		
		-- PROBLEM: deleting doesnt always work? seems minetest itself is saving stuff.
		-- so we wait a little and then delete
		minetest.after(10, function() 
			minetest.log("action", "[oldplayer] removing player filename "..filename)
			
			local err,msg = os.remove(filename) 

			if err == nil then 
				minetest.log("warning", "[oldplayer] Error while removing player data "..filename.." error message: "..msg)
			end
			-- TO DO: how to remove players from auth.txt easily without editing file manually like below
		end)
	end
end
)

-- delete file if not old player
local function remove_non_old_player_file(name)
	local filename = worldpath.."/players/"..name
	local f = io.open(filename, "r")
	local s = f:read("*all")
	
	f:close()
	
	if string.find(s,"Item oldplayer") then
		return false
	else
		os.remove(filename)
		return true
	end
end

-- deletes data with no corresponding playerfiles from auth.txt and creates auth_new.txt
local function player_file_exists(name)
	local f = io.open(worldpath.."/players/"..name, "r")
	
	if not f then
		return false
	else
		io.close(f)
		return true
	end
end

local function remove_missing_players_from_auth()
	local playerfilelist = minetest.get_dir_list(worldpath.."/players", false)
	local f = io.open(worldpath.."/auth.txt", "r")

	if not f then return end

	local s = f:read("*a")
	f:close()

	local p1, p2

	f = io.open(worldpath.."/auth_new.txt", "w")

	if not f then return end
	
	local playerlist = {}
	for _, name in ipairs(playerfilelist) do
		playerlist[name] = true
	end
	
	local i = 0
	local j = 0
	local k = 0
	local name
	local count = 0
	-- parse through auth and remove missing players data

	while j do
		j = string.find(s, ":", i)

		if j then
			if i ~= 1 then
				name = string.sub(s, i + 1, j - 1) 
			else
				name = string.sub(s, 1, j - 1)
			end
			
			if j then
				k = string.find(s, "\n", i + 1)

				if not k then 
					j = nil
				
					if playerlist[name] then 
						f:write(string.sub(s, i + 1)) 
					else 
						count = count + 1 
					end
				
				else
					if playerlist[name] then 
						f:write(string.sub(s, i + 1, k)) 
					else 
						count = count + 1
					end
					
					i = k
				end
			end
		end
	end

	f:close()
	minetest.log("action", "[oldplayer] Removed "..count.." entries from auth.txt. Replace auth.txt with auth_new.txt")
end

local function remove_non_old_player_files()
	local playerfilelist = minetest.get_dir_list(worldpath.."/players", false);

	local count = 0;
	for _,name in ipairs(playerfilelist) do
		if remove_non_old_player_file(name) then
			count = count + 1
		end
	end
	minetest.log("action", "[oldplayer] Removed "..count.." non oldplayer player files")
end

minetest.register_on_shutdown(function()
	remove_non_old_player_files()
	remove_missing_players_from_auth()
end)