module Integrity
  module Helpers
    module Gravatar
      def gravatar_attrs(author, size=40)
        # size = 40 unless %w(20 30 40 50).include?(size)
        if author.email.nil?
          {:src => "gravatar-#{size}.png", :title => 'Unknown author'}
        else
          email_digest = Digest::MD5.hexdigest(author.email)
          source = "http://gravatar.com/avatar/#{email_digest}?s=#{size}"
          {:src => source, :title => author.name}
        end
      end
    end
  end
end