module Selenium::WebDriver::ProfileHelper::ClassMethods

def from_json(json)
  data = JSON.parse(json).fetch('zip')
  # can't use Tempfile here since it doesn't support File::BINARY mode on 1.8
  # can't use Dir.mktmpdir(&blk) because of http://jira.codehaus.org/browse/JRUBY-4082
  tmp_dir = Dir.mktmpdir
  begin
    zip_path = File.join(tmp_dir, "webdriver-profile-duplicate-#{json.hash}.zip")
    File.open(zip_path, 'wb') { |zip_file| zip_file << Base64.decode64(data) }
    new Zipper.unzip(zip_path)
  ensure
    FileUtils.rm_rf tmp_dir
  end
end