How to skip plugin execution and pass the whole request downstream?

Questions
1

Hi

I’m working on a custom plugin that takes a plain username/password from our frontend, authenticates it, generates a JWT token, and sends it downstream. It works fine but for some URLs (callbacks from services we use) I need to skip this and authenticate it on the backend, not via authentication service.

this is what I’m trying to do

local request_path = kong.request.get_path()
local callback_path = conf.callback_path
local is_callback = request_path:sub(1, #callback_path) == callback_path

if is_callback then
  -- keep the authorization header
  return kong.response.exit(200, "{}", {
    ["Authorization"] = authorizationHeader
  })
end

but there are two problems here:

  1. tests are failing because some headers are missing (./spec/helpers.lua:938: Could not determine the response to be from mock_upstream)

  2. I’m just sending the header but I need the whole request to be passed downstream (headers, body, etc)

I also tried to send the raw body and all headers in the response.exit like below

return kong.response.exit(200, kong.request.get_raw_body(), kong.request.get_headers())

but got another error

./spec/helpers.lua:932: Expected the http response object to have a json encoded body, but decoding gave error 'Expected value but found T_END at character 1'. Obtained body:
.The assertion 'request' modifier takes a http response object as input to decode the json-body returned by mock_upstream, to retrieve the proxied request

basically what I need is something like this:

if is_callback then
  send_it_all_downstream
  stop_plugin_execution
end

I read through the plugin dev. kit docs but I couldn’t find a way to do what I want.

Does anyone know how to do it? Any help is much appreciated