64 lines
2 KiB
JavaScript
64 lines
2 KiB
JavaScript
const cardValidator = require('simple-card-validator');
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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 number.
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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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cvv_length: cvvLength,
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} = cardInfo.getCardDetails();
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if (!valid)
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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'))
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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))
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throw new ExpiredCreditCard(cardNumber.replace('-', ''), month, year);
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console.log(`Transaction processed: ${cardType} ending ${cardNumber.substr(-4)} \
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Amount: ${amount.currency_code}${amount.amount.decimal}.${amount.amount.fractional}`)
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return { transaction_id: -1 }
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}
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