index.js

// Require necessary modules
const path = require('path');
const fs = require('fs');
const crypto = require('crypto');
const fastify = require('fastify')({
  logger: true,
  bodyLimit: 15 * 1048576,
});
const { PKPass } = require('passkit-generator');

// Load certificates
const certDirectory = path.resolve(process.cwd(), 'cert');
const wwdr = fs.readFileSync(path.join(certDirectory, 'wwdr.pem'));
const signerCert = fs.readFileSync(path.join(certDirectory, 'signerCert.pem'));
const signerKey = fs.readFileSync(path.join(certDirectory, 'signerKey.key'));

// Define the route to handle POST requests
fastify.post('/', async (request, reply) => {
  try {
    // Destructure request body
    const {
      name,
      cardNr,
      dateFrom,
      dateTo,
      dateBirth,
      aztecCode,
      type,
      image
    } = request.body;

    // Generate pass ID
    const passID = crypto.createHash('md5').update(`${name}_${Date.now()}`).digest('hex');

    // Generate the pass
    const pass = await PKPass.from(
      {
        model: path.resolve(process.cwd(), 'transit.pass'),
        certificates: {
          wwdr,
          signerCert,
          signerKey,
        },
      },
      {
        serialNumber: passID,
      },
    );

    // Set barcode
    pass.setBarcodes({
      format: "PKBarcodeFormatAztec",
      message: aztecCode,
      messageEncoding: "iso-8859-1"
    });

    // Set expiration date
    const [day, month, year] = dateTo.split('.');
    const expirationDate = new Date(`${year}-${month}-${day}T23:59:00+01:00`);
    pass.setExpirationDate(expirationDate);

    // Add fields
    pass.headerFields.push({ key: 'type', value: type });
    pass.primaryFields.push({ key: 'name', value: name });
    pass.secondaryFields.push({ key: 'cardNr', label: "Kartennummer", value: cardNr }, { key: 'dateTo', label: "Ablaufdatum", value: dateTo });
    pass.auxiliaryFields.push({ key: 'dateBirth', label: "Geburtsdatum", value: dateBirth }, { key: 'dateFrom', label: "Beginn", value: dateFrom });

    // Add image
    const imageBuffer = Buffer.from(image, "base64");
    pass.addBuffer("thumbnail.png", imageBuffer);
    pass.addBuffer("thumbnail@2x.png", imageBuffer);

    // Set response headers and send pass as buffer
    reply.header('Content-Type', 'application/vnd-apple.pkpass');
    reply.send(pass.getAsBuffer());
  } catch (error) {
    // Log and handle errors
      console.error('Error occurred during request processing:', error);
    console.error('Error stack trace:', error.stack);
   
    reply.code(500).send({ error: 'Internal Server Error' });
  }
});

// Start the server
const port = 7860;
fastify.listen(port, '0.0.0.0', (err, address) => {
  if (err) {
    console.error(err);
    process.exit(1);
  }
  console.log(`Server listening on ${address}`);
});