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index.js
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index.js
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const { crc16xmodem } = require('crc')
const { encode, decode } = require('./tvl')
const tag = require('./constants/tag.json')
const pointOfInitiationMethod = require('./constants/pointOfInitiationMethod.json')
const application = require('./constants/application.json')
const promptPayCreditTransfer = require('./constants/promptPayCreditTransfer.json')
const promptPayBillPayment = require('./constants/promptPayBillPayment.json')
const additionalDataField = require('./constants/additionalDataField.json')
const vat = require('./constants/vat.json')
const PROMPTPAY_CREDIT_TRANSFER = 'PROMPTPAY_CREDIT_TRANSFER'
const PROMPTPAY_CREDIT_TRANSFER_WITH_OTA = 'PROMPTPAY_CREDIT_TRANSFER_WITH_OTA'
const PROMPTPAY_BILL_PAYMENT = 'PROMPTPAY_BILL_PAYMENT'
const PROMPTPAY_BILL_PAYMENT_CROSS_BORDER = 'PROMPTPAY_BILL_PAYMENT_CROSS_BORDER'
const MOBILE_NUMBER = 'MOBILE_NUMBER'
const NATIONAL_ID = 'NATIONAL_ID'
const TAX_ID = 'TAX_ID'
const E_WALLET_ID = 'E_WALLET_ID'
const BANK_ACCOUNT = 'BANK_ACCOUNT'
const CRC_INITIAL = 0xFFFF
const CRC_LENGTH = '04'
const ADDITIONAL_DATA_FIELD = 'ADDITIONAL_DATA_FIELD'
const UNKNOWN = 'UNKNOWN'
/**
*
* @typedef {'QR_STATIC' | 'QR_DYNAMIC' | 'BLE_STATIC' | 'BLE_DYNAMIC' | 'NFC_STATIC' | 'NFC_DYNAMIC'} Method
* @typedef {'PROMPTPAY_CREDIT_TRANSFER' | 'PROMPTPAY_CREDIT_TRANSFER_WITH_OTA' | 'PROMPTPAY_BILL_PAYMENT' | 'PROMPTPAY_BILL_PAYMENT_CROSS_BORDER'} Application
* @typedef {'PROMPTPAY_CREDIT_TRANSFER' | 'PROMPTPAY_BILL_PAYMENT' | 'ADDITIONAL_DATA_FIELD'} TagType
*
*/
/**
*
* @param {TagType} type
* @param {string} id
*
*/
function findTagKey (type, id) {
switch (type) {
case PROMPTPAY_CREDIT_TRANSFER:
return Object.keys(promptPayCreditTransfer).find((key) => promptPayCreditTransfer[key] === id) || UNKNOWN
case PROMPTPAY_BILL_PAYMENT:
return Object.keys(promptPayBillPayment).find((key) => promptPayBillPayment[key] === id) || UNKNOWN
case ADDITIONAL_DATA_FIELD:
return Object.keys(additionalDataField).find((key) => additionalDataField[key] === id) || UNKNOWN
default:
return Object.keys(tag).find((key) => tag[key] === id) || UNKNOWN
}
}
/**
*
* @param {object} config
* @param {Method} config.method
* @param {Application} config.application
* @param {string} [config.mobileNumber]
* @param {string} [config.nationalID]
* @param {string} [config.taxID]
* @param {string} [config.eWalletID]
* @param {string} [config.bankAccount]
* @param {string} [config.ota]
* @param {string} [config.billerID]
* @param {string} [config.reference1]
* @param {string} [config.reference2]
* @param {string} [config.mcc]
* @param {string} config.currencyCode
* @param {string} [config.amount]
* @param {string} [config.tip]
* @param {string} config.countryCode
* @param {string} [config.merchantName]
* @param {string} [config.merchantCity]
* @param {string} [config.postalCode]
* @param {object} [config.additional]
* @param {string} [config.additional.billNumber]
* @param {string} [config.additional.mobileNumber]
* @param {string} [config.additional.storeID]
* @param {string} [config.additional.loyaltyNumber]
* @param {string} [config.additional.referenceID]
* @param {string} [config.additional.customerID]
* @param {stirng} [config.additional.terminalID]
* @param {string} [config.additional.purposeOfTransaction]
* @param {string} [config.additional.additionalCustomerData]
* @param {string} [config.merchantInformation]
* @param {string} [config.sellerTaxBranchID]
* @param {string} [config.vatRate]
* @param {string} [config.vatAmount]
*
*/
function generate (config) {
if (typeof config !== 'object') throw new Error('Missing config')
if (!config.method) throw new Error('Missing required config: method')
if (!config.application) throw new Error('Missing required config: application')
if (!config.currencyCode) throw new Error('Missing required config: currencyCode')
if (!config.countryCode) throw new Error('Missing required config: countryCode')
if (!Object.keys(pointOfInitiationMethod).includes(config.method)) throw new Error('Invalid parameter: method')
if (!Object.keys(application).includes(config.application)) throw new Error('Invalid parameter: application')
let payload = encode(tag.PAYLOAD_FORMAT_INDICATOR, '01')
payload += encode(tag.POINT_OF_INITIATION_METHOD, pointOfInitiationMethod[config.method])
if (
config.application === PROMPTPAY_CREDIT_TRANSFER ||
config.application === PROMPTPAY_CREDIT_TRANSFER_WITH_OTA
) {
const identification = [
{ key: MOBILE_NUMBER, value: config.mobileNumber },
{ key: NATIONAL_ID, value: config.nationalID },
{ key: TAX_ID, value: config.taxID },
{ key: E_WALLET_ID, value: config.eWalletID },
{ key: BANK_ACCOUNT, value: config.bankAccount }
].filter((val) => val.value)
if (identification.length === 0) throw new Error(`${config.application} missing required config`)
if (config.application === PROMPTPAY_CREDIT_TRANSFER_WITH_OTA && !config.ota) throw new Error(`${config.application} missing required config: ota`)
payload += encode(
tag.PROMPTPAY_CREDIT_TRANSFER,
encode(promptPayCreditTransfer.AID, application[config.application]) +
encode(promptPayCreditTransfer[identification[0].key], identification[0].value) +
(config.ota ? encode(promptPayCreditTransfer.OTA, config.ota) : '')
)
} else if (
config.application === PROMPTPAY_BILL_PAYMENT ||
config.application === PROMPTPAY_BILL_PAYMENT_CROSS_BORDER
) {
if (!config.billerID) throw new Error(`${config.application} missing required config: billerID`)
if (!config.reference1) throw new Error(`${config.application} missing required config: reference1`)
payload += encode(
tag.PROMPTPAY_BILL_PAYMENT,
encode(promptPayBillPayment.AID, application[config.application]) +
encode(promptPayBillPayment.BILLER_ID, config.billerID) +
encode(promptPayBillPayment.REFERENCE_1, config.reference1) +
(config.reference2 ? encode(promptPayBillPayment.REFERENCE_2, config.reference2) : '')
)
}
if (config.mcc) payload += encode(tag.MCC, config.mcc)
payload += encode(tag.CURRENCY_CODE, config.currencyCode)
if (config.amount) payload += encode(tag.AMOUNT, config.amount)
payload += encode(tag.COUNTRY_CODE, config.countryCode)
if (config.merchantName) payload += encode(tag.MERCHANT_NAME, config.merchantName)
if (config.merchantCity) payload += encode(tag.MERCHANT_CITY, config.merchantCity)
if (config.postalCode) payload += encode(tag.POSTAL_CODE, config.postalCode)
if (config.additional) {
const {
billNumber,
mobileNumber,
storeID,
loyaltyNumber,
referenceID,
customerID,
terminalID,
purposeOfTransaction,
additionalCustomerData
} = config.additional
payload += encode(
tag.ADDITIONAL_DATA_FIELD,
(billNumber ? encode(additionalDataField.BILL_NUMBER, billNumber) : '') +
(mobileNumber ? encode(additionalDataField.MOBILE_NUMBER, mobileNumber) : '') +
(storeID ? encode(additionalDataField.STORE_ID, storeID) : '') +
(loyaltyNumber ? encode(additionalDataField.LOYALTY_NUMBER, loyaltyNumber) : '') +
(referenceID ? encode(additionalDataField.REFERENCE_ID, referenceID) : '') +
(customerID ? encode(additionalDataField.CUSTOMER_ID, customerID) : '') +
(terminalID ? encode(additionalDataField.TERMINAL_ID, terminalID) : '') +
(purposeOfTransaction ? encode(additionalDataField.PERPOSE_OF_TRANSACTION, purposeOfTransaction) : '') +
(additionalCustomerData ? encode(additionalDataField.ADDITIONAL_CUSTOMER_DATA, additionalCustomerData) : '')
)
}
if (config.merchantInformation) payload += encode(tag.MERCHANT_INFORMATION, config.merchantInformation)
if (config.sellerTaxBranchID) {
if (!config.vatAmount) throw new Error('VAT TQRC missing required config: vatAmount')
payload += encode(
tag.VAT_TQRC,
encode(vat.SELLER_TAX_BRANCH_ID, config.sellerTaxBranchID) +
(config.vatRate ? encode(vat.VAT_RATE, config.vatRate) : '') +
encode(vat.VAT_AMOUNT, config.vatAmount)
)
}
payload += encode(
tag.CRC,
crc16xmodem(payload + tag.CRC + CRC_LENGTH, CRC_INITIAL)
.toString(16)
.padStart(4, '0')
.toUpperCase()
)
return payload
}
/**
*
* @param {string} payload
* @param {TagType} [tagType]
*/
function parse (payload, tagType) {
if (!payload) throw new Error('Missing required payload')
if (typeof payload !== 'string') throw new Error('Invalid parameter: payload must be string')
if (tagType && ![PROMPTPAY_CREDIT_TRANSFER, PROMPTPAY_BILL_PAYMENT, ADDITIONAL_DATA_FIELD].includes(tagType)) throw new Error('Invalid Parameter: tagType')
const data = {}
while (payload.length > 0) {
const decoded = decode(payload)
switch (decoded.id) {
case tag.PROMPTPAY_CREDIT_TRANSFER:
data[decoded.id] = {
key: findTagKey(tagType, decoded.id),
value: parse(decoded.value, PROMPTPAY_CREDIT_TRANSFER)
}
break
case tag.PROMPTPAY_BILL_PAYMENT:
data[decoded.id] = {
key: findTagKey(tagType, decoded.id),
value: parse(decoded.value, PROMPTPAY_BILL_PAYMENT)
}
break
case tag.ADDITIONAL_DATA_FIELD:
data[decoded.id] = {
key: findTagKey(tagType, decoded.id),
value: parse(decoded.value, ADDITIONAL_DATA_FIELD)
}
break
default:
data[decoded.id] = {
key: findTagKey(tagType, decoded.id),
value: decoded.value
}
}
if (payload.length - decoded.raw.length < 0) throw new Error('Invalid Payload')
payload = payload.substr(decoded.raw.length, payload.length)
}
return data
}
module.exports = {
generate,
parse
}