S3 bulk rename script

# This is a quick script for doing a mass rename of all files in an Amazon S3 bucket.
# In this case, the rename operation was to unescape all filenames which had been 
# previously escaped in error.

#############################
# Configuration: 

bucketname = "YOUR_S3_BUCKET_NAME"
access_key = 'YOUR_ACCESS_KEY_ID'
secret_key = 'YOUR_SECRET_ACCESS_KEY'



#############################


require 'rubygems'
require 'aws/s3'
include AWS::S3

require 'cgi'

Base.establish_connection!(
      :access_key_id     => access_key,
      :secret_access_key => secret_key
    )

b = Bucket.find(bucketname)
marker = ''
while b.size > 0 do
  puts "\n\n--------------------new page----------------------"
  puts "\n From marker #{marker}"
  puts "\n\n--------------------------------------------------"
  b.each {|s3o| 
    if s3o.key.include? '%'
      #TODO: check with a better regex - a simple "%" search includes escaped chars
      #and legitimate files with % in the name
      begin
        S3Object.copy(CGI::escape(s3o.key), CGI::unescape(s3o.key), bucketname)
        puts "copied #{CGI::escape(s3o.key)} to #{CGI::unescape(s3o.key)}"
        #Uncomment this if you're feeling confident and want to delete the key
        #s3o.delete
      rescue Exception => e
        puts "\n\n @@@@@@@@@@@@ EXCEPTION on key #{s3o.key} \n\n"
        puts e.message
        puts "@@@@@@@@@@@@@@}"
        next
      end
      
    end
  }
  marker = b.objects.last.key
  b = Bucket.find('presslift', {:marker => marker})
end