[Github Webhook with LuaJit]

github_webhook_nginx_luajit.lua

local ffi = nil
local token = 'xxx'

ffi = require("ffi")
ffi.load("z")
ffi.cdef[[int system(const char * string);]]

if "POST" == ngx.var.request_method then
    ngx.req.read_body()
    local args, err = ngx.req.get_post_args()
    if args ~= nil then
        local _token = nil
        for key, val in pairs(args) do
            if key == "token" then
                if  val ~= nil then
                    _token = val
                end
            end
        end
        if _token == token then
            ffi.C.system("cd /var/www/blog && git pull >> /var/log/updatelua.log")
            ngx.say("ok")
            ngx.exit(0)
        end
    end
end
ngx.status = ngx.HTTP_INTERNAL_SERVER_ERROR
ngx.say("")