S3 Resize images

resize.rb

require 'aws/s3'
require 'RMagick'
include AWS::S3
include Magick

AWS::S3::Base.establish_connection!(
    :access_key_id     => 'key',
    :secret_access_key => 'secret'
)
bucket = 'bucket_name';

marker = ''
loop do
  objects = Bucket.objects(bucket, :marker=>marker, :max_keys=>1000)
  break if objects.size == 0
  marker = objects.last.key

  objects.each do |obj|
      fn = obj.key
      if fn.include?('/') then
        next
      end
      puts "#{fn}"
      image = obj.value
      begin
        mimage = Magick::Image.from_blob(image).first
      rescue
        image = Base64.decode64(image)
        mimage = Magick::Image.from_blob(image).first
        #Fix image file encoding
        S3Object.store(fn, image, bucket, :use_ssl => false)
      end
      #Resize to 42px and 64px
      thumb42 = mimage.resize_to_fit(42).to_blob
      thumb64 = mimage.resize_to_fit(64).to_blob
      S3Object.store(fn, thumb42, bucket+'/42', :use_ssl => false)
      S3Object.store(fn, thumb64, bucket+'/64', :use_ssl => false)
      GC.start
  end
end