File: untrusted-event.js

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let sender = null;

self.addEventListener('message', e => {
  sender = e.source;

  if (e.data == 'paymentrequest') {
    self.dispatchEvent(new PaymentRequestEvent('paymentrequest', {
      methodData: [{
        supportedMethods: 'basic-card'
      }],
      total: {
        currency: 'USD',
        value: '100'
      },
      modifiers: [{
        supportedMethods: 'basic-card'
      }]
    }));
  } else if (e.data == 'canmakepayment') {
    self.dispatchEvent(new CanMakePaymentEvent('canmakepayment', {
      methodData: [{
        supportedMethods: 'basic-card'
      }],
      modifiers: [{
        supportedMethods: 'basic-card'
      }]
    }));
  }
});

self.addEventListener('paymentrequest', async e => {
  const result = [];

  try {
    e.respondWith({});
  } catch (exception) {
    result.push(exception.name);
  }

  try {
    await e.openWindow('payment-app/payment.html');
  } catch (exception) {
    result.push(exception.name);
  }

  sender.postMessage(result);
});

self.addEventListener('canmakepayment', async e => {
  const result = [];

  try {
    e.respondWith({});
  } catch (exception) {
    result.push(exception.name);
  }

  sender.postMessage(result);
});