apigw.rb

class DataServiceClient
  def initialize(customer_id)
    raise "Invalid Customer Id" if customer_id.to_i.zero?

    @customer_id = customer_id.to_i
    @client = RestClient::Resource.new(ENV['DATA_API_URL'] + '/customers/' + @customer_id.to_s,
      :headers => { 'X-Access-Token' => ENV['DATA_API_KEY'], 'Accept' => 'application/json' })
  end
  
  def info
    {
      :assets => handle_response(@client['assets'].get(), [ :id, :asset_type, :value ]),
      :projects => handle_response(@client['projects'].get(), [ :id, :type, :name ])
    }
  end

  private

  def handle_response(res, whitelist=[])
    if res.code == 200
      do_whitelist(JSON.parse(res.body), whitelist)
    else
      { :error => 'UpstreamError', :message => 'Failed to fetch resource from upstream' }
    end
  end

  def do_whitelist(h, w)
    # Do whitelisting of hash keys
  end
end