Rake Task to Update AWS Content Dispositions of All Files in a Bucket

update_content_dispositions.rake

namespace :aws do
  desc 'Update Dispositions'
  task :update_dispositions => :environment do
    bucket_name = ENV['BUCKET']

    s3 = Aws::S3::Resource.new
    bucket = s3.bucket(bucket_name)
    bucket.objects.each do |obj|
      key = obj.key

      original_key = key + ".original"

      # Print what file we're moving.
      puts key

      # Move the file to different location.
      obj.move_to({ bucket: bucket_name, key: original_key})

      # Copy it back to its original location with the new content disposition.
      bucket.object(original_key).copy_to({ bucket: bucket_name, key: key }, {
        metadata_directive: 'REPLACE',
        content_disposition: 'attachment'
      })

      # Delete the copy.
      bucket.object(original_key).delete
    end
  end
end