sample4.rb

get '/sample4' do
  haml :sample4
end

post '/sample4' do

  set :client_id, params[:client_id]
  set :private_key, params[:private_key]
  set :file_id, params[:file_id]
  set :source, params[:source]
  set :url, params[:url]

  begin

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

    file = nil
    case settings.source
      when 'guid'
        file = GroupDocs::Storage::File.new({:guid => settings.file_id})
      when 'local'

        filepath = "#{Dir.tmpdir}/#{params[:file][:filename]}"

        File.open(filepath, 'wb') { |f| f.write(params[:file][:tempfile].read) }

        file = GroupDocs::Storage::File.upload!(filepath, {}, client_id: settings.client_id, private_key: settings.private_key)
      when 'url'
        file = GroupDocs::Storage::File.upload_web!(settings.url, client_id: settings.client_id, private_key: settings.private_key)
      else
        raise 'Wrong GUID source.'
    end

    pp file
    pp file.name

    dowloaded_file = file.download!("#{File.dirname(__FILE__)}/../public/downloads", {:client_id => settings.client_id, :private_key => settings.private_key})
    unless dowloaded_file.empty?
      massage = "<font color='green'>File was downloaded to the <font color='blue'>#{dowloaded_file}</font> folder</font> <br />"
    end

  rescue Exception => e
    err = e.message
  end

  haml :sample4, :locals => {:userId => settings.client_id, :privateKey => settings.private_key, :file_id => settings.file_id, :massage => massage, :err => err}
end