debug_app.rb

###
# log requests that hopefully send some readable data
#
# RACK_ENV=development bundle exec unicorn --config-file unicorn_conf.rb config.ru
#
require 'json'
require 'logger'
require 'sinatra/base'
require 'sinatra/multi_route'
require 'rack'
require 'rack/contrib'
require 'active_support/all'

class DebugApp < Sinatra::Base
  register Sinatra::MultiRoute

  configure do
    set :raise_errors, true
    set :dump_errors, false
    set :show_exceptions, false
    use Rack::BounceFavicon
  end

  get '/health-check' do
    set_response_headers

    [200, {}, ['this is the debug app']]
  end

  route :patch, :post, :put, :delete, '/*' do
    set_response_headers

    puts("#{request.url}#{request.query_string}")
    puts("## headers")
    request.env.slice(*header_keys_to_display).map do |k, v|
      puts("#{k}: #{v}")
    end
    puts("## body")
    body = request.body.read; request.body.rewind
    print_body(body)
    puts("\n")

    [200, {}, ['']]
  end

  private

  def header_keys_to_display
    @good_keys ||= [
      "HTTP_USER_AGENT",
      "HTTP_X_TASK_SCHEDULER_SECRET_TOKEN",
    ]
  end

  def print_body(body)
    begin puts(JSON.pretty_generate(JSON.parse(body))); return nil; rescue StandardError; nil; end
    begin puts(URI.decode_www_form(body)); return nil; rescue StandardError; nil; end
    begin puts(XML.parse(body)); return nil; rescue StandardError; nil; end
    begin puts(body); return nil; rescue StandardError; nil; end

    puts("???") if body.present?
  end

  def set_response_headers
    response.headers['X-app-name'] = 'debug_app'
  end
end