lua plugin system

rootfs/etc/nginx/lua/plugins/hello_world/main.lua

@@ -0,0 +1,15 @@
+local _M = {}
+
+function _M.rewrite()
+  ngx.req.set_header("x-hello-world", "1")
+end
+
+function _M.access()
+  local ua = ngx.var.http_user_agent
+
+  if ua == "hello" then
+    ngx.exit(403)
+  end
+end
+
+return _M