sample2.rb

get '/sample2' do
  haml :sample2
end

post '/sample2' do

  set :client_id, params[:client_id]
  set :private_key, params[:private_key]

  begin

    raise 'Please enter all required parameters' if settings.client_id.empty? or settings.private_key.empty?

    files_list = GroupDocs::Storage::Folder.list!('/', {}, {:client_id => settings.client_id, :private_key => settings.private_key})

    filelist = ''
    files_list.each { |element| filelist << "#{element.name}<br />" }

  rescue Exception => e
    err = e.message
  end

  haml :sample2, :locals => {:userId => settings.client_id, :privateKey => settings.private_key, :filelist => filelist, :err => err}
end