Allow paying with using on-site credit card (#22)

assets/shop/entrypoint.js

@@ -0,0 +1 @@
+import './js/card_encoder';

assets/shop/js/card_encoder.js

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+import * as JSEncrypt from './jsencrypt.min';
+
+document.addEventListener('DOMContentLoaded', () => {
+  const form = document.querySelector('[name="sylius_checkout_complete"]');
+  const submit_button = form.querySelector('[type="submit"]');
+  const cards_api = document.getElementById('sylius_checkout_complete_tpay_cards_api').value.replace(/\s/g, '');
+  const encrypted_card_field = document.getElementById('sylius_checkout_complete_tpay_card_card');
+
+  const encrypt = new JSEncrypt();
+  encrypt.setPublicKey(atob(cards_api));
+
+  submit_button.addEventListener('click', (e) => {
+    e.preventDefault();
+
+    const card_number = document.getElementById('sylius_checkout_complete_tpay_card_number').value.replace(/\s/g, '');
+    const cvc = document.getElementById('sylius_checkout_complete_tpay_card_cvv').value.replace(/\s/g, '');
+    const expiration_date_month = document.getElementById('sylius_checkout_complete_tpay_card_expiration_date_month').value.replace(/\s/g, '');
+    const expiration_date_year = document.getElementById('sylius_checkout_complete_tpay_card_expiration_date_year').value.replace(/\s/g, '');
+    const expiration_date = [expiration_date_month, expiration_date_year].join('/');
+
+    encrypted_card_field.value = encrypt.encrypt([card_number, expiration_date, cvc, document.location.origin].join('|'));
+
+    form.submit();
+  })
+});