sample7.rb

get '/sample7' do
  haml :sample7
end

post '/sample7' 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!('/', {:extended => true}, {:client_id => settings.client_id, :private_key => settings.private_key})

    thumbnails = ''
    files_list.each do |element|
      if element.class.name.split('::').last == 'Folder'
        next
      end

      if element.thumbnail
        name = element.name
        thumbnails += "<p><img src='data:image/png;base64,#{element.thumbnail}', width='40px', height='40px'> #{name}</p>"
      end
    end

    unless thumbnails.empty?
      set :thumbnails, thumbnails
    end

  rescue Exception => e
    err = e.message
  end

  haml :sample7, :locals => {:userId => settings.client_id, :privateKey => settings.private_key, :thumbnailList => thumbnails, :err => err}
end