module Terraformer
  module Credentials
    class Aws
      def self.get_from_options(options)
        credentials = {}
        %w(aws_region aws_access_key_id aws_secret_access_key).each do |key|
          aws_key = key.sub("aws_", "").to_sym
          credentials[aws_key] = options[key.to_sym].nil? ? options[key] : options[key.to_sym]
          credentials[aws_key] = ENV[key.upcase] if credentials[aws_key].nil?
        end

        credentials.reject{ |k, v| v.nil? }
      end
    end
  end
end