mirror of
https://github.com/joe7575/techpack.git
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118 lines
2.3 KiB
Lua
118 lines
2.3 KiB
Lua
--[[
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SaferLua [safer_lua]
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====================
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Copyright (C) 2018 Joachim Stolberg
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LGPLv2.1+
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See LICENSE.txt for more information
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environ.lua:
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]]--
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safer_lua.MaxCodeSize = 2000 -- size in length of byte code
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safer_lua.MaxTableSize = 1000 -- number of table entries considering string lenghts
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local BASE_ENV = {
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Store = safer_lua.Store,
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math = {
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floor = math.floor,
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abs = math.abs,
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max = math.max,
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min = math.min,
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random = math.random,
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},
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tonumber = tonumber,
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tostring = tostring,
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type = type,
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ticks = 0,
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}
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local function map(dest, source)
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for k,v in pairs(source) do
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dest[k] = v
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end
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return dest
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end
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function safer_lua.config(max_code_size, max_table_size)
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safer_lua.MaxCodeSize = max_code_size
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safer_lua.MaxTableSize = max_table_size
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end
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local function compile(pos, text, label, err_clbk)
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if safer_lua:check(text, label, err_clbk) == 0 then
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text = text:gsub("%$", "S:")
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local code, err = loadstring(text)
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if not code then
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err = err:gsub("%[string .+%]:", label)
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err_clbk(pos, err)
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else
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return code
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end
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end
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end
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function safer_lua.init(pos, init, loop, environ, err_clbk)
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if #init > safer_lua.MaxCodeSize then
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err_clbk(pos, "init() Code size limit exceeded")
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return
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end
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if #loop > safer_lua.MaxCodeSize then
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err_clbk(pos, "loop() Code size limit exceeded")
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return
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end
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local code = compile(pos, init, "init() ", err_clbk)
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if code then
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local env = BASE_ENV
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env.S = {}
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env.S = map(env.S, environ)
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setfenv(code, env)
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local res, err = pcall(code)
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if not res then
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err = err:gsub("%[string .+%]:", "init() ")
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err_clbk(pos, err)
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else
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env = getfenv(code)
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code = compile(pos, loop, "loop() ", err_clbk)
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if code then
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setfenv(code, env)
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return code
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end
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end
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end
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end
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function safer_lua.run_loop(pos, elapsed, code, err_clbk)
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local env = getfenv(code)
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env.event = false
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env.ticks = env.ticks + 1
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env.elapsed = elapsed
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local res, err = pcall(code)
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if not res then
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err = err:gsub("%[string .+%]:", "loop() ")
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err_clbk(pos, err)
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return false
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end
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return true
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end
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function safer_lua.run_event(pos, code, err_clbk)
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local env = getfenv(code)
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env.event = true
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env.elapsed = 0
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local res, err = pcall(code)
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if not res then
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err = err:gsub("%[string .+%]:", "loop() ")
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err_clbk(pos, err)
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return false
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end
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return true
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end
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