Set far future cache control for existing files in an s3 bucket

set_cache_control_s3.rb

require 'rubygems'
require 'aws/s3'

AWS::S3::Base.establish_connection!(
  :access_key_id     => '',
  :secret_access_key => ''
)

bucket = AWS::S3::Bucket.find('my_bucket')

objects = bucket.objects
size = objects.size

objects.each_with_index do |file, index|
  path = file.path
  print "#{index + 1}/#{size} #{path} ... "
  file.cache_control = 'max-age=315360000'
  file.save({:access => :public_read})
  puts "done."
end

FYI, this appears to download each file locally, then upload it?