Generating PDF from website screenshot using Iron Router and Webshot

generate-pdf.js

/**
 * Generating PDF from website screenshot.
 * 
 * Using iron:router's server-side route and meteorhacks:npm to load Webshot NPM package.
 * Don't forget to add "webshot": "0.16.0" to your packages.json file. Example:
 *   {
 *     "webshot": "0.16.0"
 *   }
 * Tried it with bryanmorgan:webshot but it didn't work so sticking to loading NPM package directly.
 * Thanks to @nate-strauser (https://github.com/nate-strauser).
 */
Router.route('generatePDF', {
  path: '/invoices/:_id/generate-pdf', // example route with _id param
  where: 'server',
  action: function() {
    // Get invoice ID parameter
    var invoiceId = this.params._id;
    
    // Setting name for our generated PDF
    var fileName = "invoice_" + invoiceId + ".pdf";
    
    // Load NPM packages
    var webshot  = Meteor.npmRequire('webshot');
    var fs       = Npm.require('fs');
    var Future   = Npm.require('fibers/future');
    
    var fut      = new Future();
    
    // Set path to your route here - Meteor.absoluteUrl() is your root url ("http://localhost:3000/")
    var url      = Meteor.absoluteUrl('invoices/' + invoiceId); // Meteor.absoluteUrl('path/to/your/route');
    
    // How you want your PDF to look, it also waits 3 seconds just to make sure photo has been taken
    var options = {
      "renderDelay": 3000,
      "paperSize": {
        "format": "Letter", 
        "orientation": "portrait", 
        "margin": "1cm"
      }
    };
  
    // Magic happens here...
    webshot(url, fileName, options, function(err) {
      if (err) {
        return console.log(err);
      } else { 
        fs.readFile(fileName, function (error,data) {
          if (error) {
            return console.log(err);
          }

          fs.unlinkSync(fileName);
          fut.return(data);
        });
      }
    });
  
    // Give our generated PDF to the client
    this.response.writeHead(200, {'Content-Type': 'application/pdf',"Content-Disposition": "attachment; filename=" + fileName});
    this.response.end(fut.wait());
  }
});