84 lines
2.7 KiB
JavaScript
84 lines
2.7 KiB
JavaScript
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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const cardValidator = require('simple-card-validator');
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const uuid = require('uuid/v4');
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const pino = require('pino');
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const logger = pino({
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name: 'paymentservice-charge',
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messageKey: 'message',
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changeLevelName: 'severity',
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useLevelLabels: true
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});
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class CreditCardError extends Error {
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constructor (message) {
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super(message);
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this.code = 400; // Invalid argument error
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}
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}
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class InvalidCreditCard extends CreditCardError {
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constructor (cardType) {
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super(`Credit card info is invalid`);
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}
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}
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class UnacceptedCreditCard extends CreditCardError {
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constructor (cardType) {
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super(`Sorry, we cannot process ${cardType} credit cards. Only VISA or MasterCard is accepted.`);
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}
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}
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class ExpiredCreditCard extends CreditCardError {
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constructor (number, month, year) {
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super(`Your credit card (ending ${number.substr(-4)}) expired on ${month}/${year}`);
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}
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}
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/**
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* Verifies the credit card number and (pretend) charges the card.
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*
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* @param {*} request
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* @return transaction_id - a random uuid v4.
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*/
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module.exports = function charge (request) {
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const { amount, credit_card: creditCard } = request;
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const cardNumber = creditCard.credit_card_number;
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const cardInfo = cardValidator(cardNumber);
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const {
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card_type: cardType,
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valid
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} = cardInfo.getCardDetails();
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if (!valid) { throw new InvalidCreditCard(); }
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// Only VISA and mastercard is accepted, other card types (AMEX, dinersclub) will
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// throw UnacceptedCreditCard error.
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if (!(cardType === 'visa' || cardType === 'mastercard')) { throw new UnacceptedCreditCard(cardType); }
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// Also validate expiration is > today.
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const currentMonth = new Date().getMonth() + 1;
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const currentYear = new Date().getFullYear();
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const { credit_card_expiration_year: year, credit_card_expiration_month: month } = creditCard;
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if ((currentYear * 12 + currentMonth) > (year * 12 + month)) { throw new ExpiredCreditCard(cardNumber.replace('-', ''), month, year); }
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logger.info(`Transaction processed: ${cardType} ending ${cardNumber.substr(-4)} \
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Amount: ${amount.currency_code}${amount.units}.${amount.nanos}`);
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return { transaction_id: uuid() };
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};
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