Generate PDF's and Barcodes with Feathers.js

tickets.class.js

const errors = require('feathers-errors');
const PDFDocument = require('pdfkit');
const bwipjs = require('bwip-js');

/* eslint-disable no-unused-vars */
class Service {
  constructor (options) {
    this.options = options || {};
  }

  _generateBarcode (text) {
    return new Promise((resolve, reject) => {
      bwipjs.toBuffer({
        bcid: 'code128',
        text,
        scale: 5,
        height: 10,
        includetext: true,
        textxalign: 'center'
      }, (err, png) => {
        if (err) reject(err);
        else resolve(png);
      });
    });
  }

  _generatePdf (booking) {
    const doc = new PDFDocument();
    // Title and name of event
    doc.fontSize(25).text(booking.firstName + ' ' + booking.lastName, 100, 100);
    doc.fontSize(16)
      .text(`${booking.numberOfSpots} toegangticket${booking.numberOfSpots > 1 ? 's' : ''} voor ${booking.eventName} - ${booking.price} EUR`);
    // Add Bookfast website
    doc.fontSize(16).text('Ticketing by', 100, 320);
    doc.fontSize(25).text('www.example.com', 100, 345);
    // Add a hr stroke
    doc.moveTo(100, 160).lineTo(508, 160).lineTo(508, 161).lineTo(100, 161).fill('#DEDEDE');
    // Add the barcode
    return this._generateBarcode(booking._id).then(barcode => {
      doc.image(barcode, 100, 200, { width: 408 });
      return doc;
    });
  }

  async get (id, params) {
    return this.app.service('bookings').get(id).then(booking => {
      return this._generatePdf(booking);
    }).catch(() => {
      throw new errors.NotFound('Booking not found.');
    });
  }

  setup(app) {
    this.app = app;
  }
}

module.exports = function (options) {
  return new Service(options);
};

module.exports.Service = Service;