rubyZip Gem: Want to zip remote files in RoR - ruby-on-rails-3

Question

I want to download photos from my website after zipping. I am using rubyZip gem but unable to zip remote files. Following is the scenario:
I am trying to zip content from server. Content is something like this
http://myApplication.s3.amazonaws.com/xxxxxxxx/image/image1.jpeg,
So in "zipfile.add( attachment.document_file_name, attachment.document.url)", i assigned following values:
document_file_name = image1.jpeg/image2.jpeg/image3.jpeg
document.url = http://myApplication.s3.amazonaws.com/xxxxxxxx/image
Now here I am getting following error:
No such file or directory - myApplication.s3.amazonaws.com/xxxxxxxx/image
This gem is working fine if I zipped files from local file system (e.g: /home/user/images) but not for remote files.
Is I am doing something wrong? Can someone help me out? Or any other gem which can do this?
Thanks,
-Tahniyat

Answer 1

What you can do is read it first from s3 write it directly to the archive file (put archive file to your temporary directory), serve it then delete the temp archive file. Here's a little snippet:
require 'zip/zip'
s3 = Aws::S3.new(S3_KEY, S3_SECRET)
bucket_gen = Aws::S3Generator::Bucket.create(s3, S3_BUCKET)
archive_file = "#{Rails.root}/tmp/archive.zip"
Zip::ZipOutputStream.open(archive_file) do |zos|
list_of_files_to_loop.each do |file|
filename = file.filename
url = "#{S3_PATH}/#{filename}"
signed_url = bucket_gen.get(URI.unescape(URI.parse(URI.escape(url)).path[1..-1]), 1.minute)
zos.put_next_entry(filename) # Give it next file a filename
zos.print(URI.parse(signed_url).read) # Add file to zip
end
end # Write zip file
# TODO: Serve file
# TODO: Delete archived file from tmp directory
Reference:
http://rubyzip.sourceforge.net/classes/Zip/ZipOutputStream.html