sample23.rb

get '/sample23' do
  haml :sample23
end

post '/sample23' do

  set :client_id, params[:clientId]
  set :private_key, params[:privateKey]
  set :source, params[:source]
  set :file_id, params[:fileId]
  set :url, params[:url]
  set :base_path, params[:basePath]

  begin

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

    if settings.base_path.empty? then settings.base_path = 'https://api.groupdocs.com' end

    GroupDocs.configure do |groupdocs|
      groupdocs.client_id = settings.client_id
      groupdocs.private_key = settings.private_key

      groupdocs.api_server = settings.base_path # default is 'https://api.groupdocs.com'
    end

    case settings.source
    when 'guid'

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

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

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

        file = GroupDocs::Storage::File.upload!(file_path, {})
    when 'url'

        file = GroupDocs::Storage::File.upload_web!(settings.url)
    else
        raise 'Wrong GUID source.'
    end

    raise 'No such file' unless file.is_a?(GroupDocs::Storage::File)

    document = file.to_document

    page_image = document.page_images!(700, 700, {})

  rescue Exception => e
    err = e.message
  end

  haml :sample23,  :locals => {:userId => settings.client_id, :privateKey => settings.private_key, :page_image => page_image, :err => err}
end