RoR: catch send_file via cookies

_download_button.html.erb

<!-- Using ladda-button plugin and bootsrtap  -->
<!-- setting data-attributes to link with unique token  -->
<%= link_to download_products_event_path(event, format: :xlsx), class: "download-file-btn",
    data: { token_value: SecureRandom.hex, token_name: "products_download_token_#{event.id}"} do %>
  <button class="btn btn-outline btn-primary dim ladda-button" type="button" data-style="zoom-out">
    <i class="fa fa-file-excel-o"></i> Download
  </button>
<% end %>

<!--  @TODO: we could also check if token exists to disable button 
             in case of someone somehow will try to download same large file in different tabs -->

download.js

// Jquery + js-cookie (https://github.com/js-cookie/js-cookie)

$(document).ready(function () {
  $('.download-file-btn').on('click', function(e){
    e.preventDefault();
    // updating GET action with token attributes provided
    var token_name = $(this).data('token-name');
    var token_value = $(this).data('token-value');
    window.location.href = $(this).attr("href") + '?token_name=' + token_name + '&token_value=' + token_value
    
    fileDownloadCheckTimer = window.setInterval(function () {
      var cookie_value = Cookies.get(token_name)
      if(cookie_value == token_value){
        Cookies.remove(token_name) // reset cookies
        Ladda.stopAll(); // reset button
        clearInterval(fileDownloadCheckTimer);
      };
    }, 1000);
  });
});

products_controller.rb

class EventsController < ApplicationController
  ### Action example using render axlsx
  def download_products
    token_name  = params[:token_name]
    token_value = params[:token_value]

    respond_to do |format|
      format.xlsx {
        
        # setting cookies when download finishes
        cookies[token_name] = {
          value: token_value,
          expires: 5.minutes.since,
        }

        render xlsx: "filename",
          template: 'templates/xlsx/products.xlsx.axlsx',
          locals: { products: resource.visible_products }
      }
    end
  end

  private

  def resource
    @_resource ||= Event.find(params[:id])
  end
end