require 'lets_encrypt_heroku_client/version'

class LetsEncryptHerokuClient
  def initialize(app)
    @app = app
  end

  def call(env)
    if challenge_url?(env['PATH_INFO'])
      body = ENV['LETS_ENCRYPT_CHALLENGE_FILE_CONTENT']
      headers = {
        'Content-Length' => body.length.to_s
      }

      [200, headers, [body]]
    else
      app.call(env)
    end
  end

  private

  attr_reader :app

  def challenge_url?(path)
    ENV.include?('LETS_ENCRYPT_CHALLENGE_FILENAME') &&
      path == "/#{ENV['LETS_ENCRYPT_CHALLENGE_FILENAME']}"
  end
end