local M = {} local session = require "resty.session" function M.get_challenge () local charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIKLMNOPQRSTUVWXYZ0123456789" math.randomseed(os.clock()*os.time()) local random = "" local rand = 0 for i = 1, 20 do rand = math.random(1, #charset) random = random .. charset:sub(rand, rand) end return random end function M.get_code (challenge, antibot_uri, original_uri) return string.format([[ ]], challenge, antibot_uri, original_uri) end function M.check (challenge, user) local resty_sha256 = require "resty.sha256" local str = require "resty.string" local sha256 = resty_sha256:new() sha256:update(challenge) local digest = sha256:final() return str.to_hex(digest) == user end return M