pix-utils
Version:
Set of tools to parse, generate and validate payments of Brazil Instant Payment System (Pix)
93 lines • 10.2 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseEmv = exports.createEmv = void 0;
const crc_1 = require("./crc");
const pixElements_1 = require("./types/pixElements");
const pixEmvSchema_1 = require("./types/pixEmvSchema");
const textParser_1 = require("./utils/textParser");
const zeroPad_1 = __importDefault(require("./utils/zeroPad"));
function generateEmvElement(elementId, value) {
if (!value)
return '';
const parsedElementId = (0, zeroPad_1.default)(elementId, 2);
const parsedLength = (0, zeroPad_1.default)(value.length, 2);
return `${parsedElementId}${parsedLength}${value}`;
}
function generateMAI(elements) {
if (elements.type === pixElements_1.PixElementType.STATIC) {
return [
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_GUI, pixEmvSchema_1.EmvMaiSchema.BC_GUI),
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_PIXKEY, elements.pixKey),
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_INFO_ADD, elements.infoAdicional),
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_FSS, elements.fss),
].join('');
}
else if (elements.type === pixElements_1.PixElementType.DYNAMIC) {
return [
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_GUI, pixEmvSchema_1.EmvMaiSchema.BC_GUI),
generateEmvElement(pixEmvSchema_1.EmvMaiSchema.TAG_MAI_URL, elements.url),
].join('');
}
return undefined;
}
function generateAdditionalData(txid) {
return generateEmvElement(pixEmvSchema_1.EmvAdditionalDataSchema.TAG_TXID, txid || '***');
}
function createEmv(elements) {
if (![pixElements_1.PixElementType.STATIC, pixElements_1.PixElementType.DYNAMIC].includes(elements.type))
return 'INVALID';
const emvElements = [
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_INIT, '01'),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_ONETIME, elements.oneTime ? '12' : ''),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_MAI, generateMAI(elements)),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_MCC, elements.merchantCategoryCode),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_TRANSACTION_CURRENCY, elements.transactionCurrency),
elements.type === pixElements_1.PixElementType.STATIC
? generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_TRANSACTION_AMOUNT, elements.transactionAmount > 0
? elements.transactionAmount.toFixed(2)
: '')
: '',
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_COUNTRY_CODE, elements.countryCode),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_MERCHANT_NAME, (0, textParser_1.normalizeName)(elements.merchantName)),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_MERCHANT_CITY, (0, textParser_1.normalizeCity)(elements.merchantCity)),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_ADDITIONAL_DATA, generateAdditionalData(elements.type === pixElements_1.PixElementType.STATIC ? elements.txid : '')),
generateEmvElement(pixEmvSchema_1.EmvSchema.TAG_CRC, '0000'),
];
const generatedEmv = emvElements.join('');
return generatedEmv.replace(/\w{4}$/, (0, crc_1.computeCRC)(generatedEmv));
}
exports.createEmv = createEmv;
function parseEmv({ emvCode, currentIndex = 0, currentData = {}, }) {
const tag = +emvCode.substring(currentIndex, currentIndex + 2);
const length = Number(emvCode.substring(currentIndex + 2, currentIndex + 4));
const value = emvCode.substring(currentIndex + 4, currentIndex + 4 + length);
if (!length || !value.length || length !== value.length) {
return {
isValid: false,
rawTags: currentData,
};
}
const newData = Object.assign(Object.assign({}, currentData), { [tag]: Object.assign({ tag: tag, length: length, value: value }, (Object.values(pixEmvSchema_1.TagsWithSubTags).includes(tag)
? { subTags: parseEmv({ emvCode: value }) }
: {})) });
if (currentIndex + 4 + length === emvCode.length) {
return {
isValid: true,
rawTags: newData,
getTag: (tag) => { var _a; return (_a = newData === null || newData === void 0 ? void 0 : newData[Number(tag)]) === null || _a === void 0 ? void 0 : _a.value; },
getSubTag: (tag, mainTag) => { var _a, _b; return (_b = (_a = newData === null || newData === void 0 ? void 0 : newData[Number(mainTag)]) === null || _a === void 0 ? void 0 : _a.subTags) === null || _b === void 0 ? void 0 : _b.getTag(Number(tag)); },
};
}
else {
return parseEmv({
emvCode,
currentIndex: currentIndex + 4 + length,
currentData: newData,
});
}
}
exports.parseEmv = parseEmv;
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MsQ0FBQyxDQUFBLEVBQUE7U0FDM0QsQ0FBQztLQUNIO1NBQU07UUFDTCxPQUFPLFFBQVEsQ0FBQztZQUNkLE9BQU87WUFDUCxZQUFZLEVBQUUsWUFBWSxHQUFHLENBQUMsR0FBRyxNQUFNO1lBQ3ZDLFdBQVcsRUFBRSxPQUFPO1NBQ3JCLENBQUMsQ0FBQztLQUNKO0FBQ0gsQ0FBQztBQTNDRCw0QkEyQ0MifQ==