how to use `setfenv()' provide an openresty sandbox

jiahao.exe · 2018-01-22T19:23:38+00:00

b=[[ip='2.2.2.2']]c={}for i in b:gmatch('(.*)') do table.insert(c,{i})endprint(c['ip'])why get value...

how to use `setfenv()' provide an openresty sandbox

jiahao.exe

local env = {ngx = ngx}
local hacked_set_header_function = function() end

env.ngx.req.set_header = hacked_set_header_function

-- f is function
setfenv(f, env)
pcall(f)

-- result is
-- ngx.req.set_header is modified

Is there anyway to write an openresty sandbox without modify _G.ngx ?