A middleware for apitools.com to control a LIFX build light using Buildkite webhooks

buildkite_lifx_build_light_apitools_middleware.lua

return function(request, next_middleware)
  local next_response = next_middleware()
  
  -- Modify these
  local lifx_access_token = "xxx"
  local bulb_selector = "id:xxx"
  local webhook_token = "xxx"

  -- The rest is standard and doesn't need to be modified
  if request.headers["X-Buildkite-Token"] ~= webhook_token then
    return next_response
  end
  
  local event_name = request.headers["X-Buildkite-Event"]
  local event = json.decode(request.body)

  local lifx_params = { power_on = false }

  if event_name == "build.running" then
    lifx_params.color      = "yellow brightness:5%"
    lifx_params.from_color = "yellow brightness:35%"
    lifx_params.period     = 5
    lifx_params.cycles     = 9999
    lifx_params.persist    = true
  elseif event_name == "build.finished" and event.build.state == "passed" then
    lifx_params.color      = "green brightness:75%"
    lifx_params.from_color = "green brightness:10%"
    lifx_params.period     = 0.45
    lifx_params.cycles     = 3
    lifx_params.persist    = true
    lifx_params.peak       = 0.2
  elseif event_name == "build.finished" and event.build.state == "failed" then
    lifx_params.color      = "red brightness:60%"
    lifx_params.from_color = "red brightness:25%"
    lifx_params.period     = 0.1
    lifx_params.cycles     = 20
    lifx_params.persist    = true
    lifx_params.peak       = 0.2
  end
  
  local lifx_url = "https://api.lifx.com/v1beta1/lights/" .. bulb_selector .. "/effects/breathe.json"
  local lifx_headers = { Authorization = "Bearer " .. lifx_access_token }

  local lifx_response = http.json.post(lifx_url, json.encode(lifx_params), { headers = lifx_headers })
  console.log(lifx_response)

  return next_response
end