Working S3 Policy

gistfile1.rb

bucket = ENV['S3_BUCKET']
access_key = ENV['S3_KEY']
secret = ENV['S3_SECRET']
key = "temp/"
content_type = "application/pdf"
expiration = 5.hours.from_now.utc.strftime('%Y-%m-%dT%H:%M:%S.000Z')
max_filesize = 500.megabytes
acl = 'public-read'
policy = Base64.encode64(
  "{'expiration': '#{expiration}',
    'conditions': [
      {'bucket': '#{bucket}'},
       ['starts-with', '$key', '#{key}'],
       {'acl': '#{acl}'},
       {'Content-Type': '#{content_type}'},
       {'Content-Disposition': 'attachment'},
       ['starts-with', '$Filename', ''],
       ['eq', '$success_action_status', '201']
    ]}
").gsub(/\n|\r/, '')