gistfile1.rb

class AwsController < ApplicationController
  def call
    service = AWS.const_get(params[:service]).new(params[:service_params] || {})
    result = service.client.send(params[:method].to_sym, params[:options] || {})

    respond_to do |format|
      format.json { render :json => result.data }
    end
  end
end