@adyen/api-library
Version:
The Adyen API Library for NodeJS enables you to work with Adyen APIs.
121 lines • 6.01 kB
JavaScript
;
/*
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* Adyen NodeJS API Library
* Copyright (c) 2020 Adyen B.V.
* This file is open source and available under the MIT license.
* See the LICENSE file for more info.
*/
Object.defineProperty(exports, "__esModule", { value: true });
const crypto_1 = require("crypto");
const apiConstants_1 = require("../constants/apiConstants");
class HmacValidator {
/**
* Calculate HMAC signature of the payload data
* @param data payload as String or as NotificationRequestItem
* @param key HMAC key
* @returns HMAC signature
*/
calculateHmac(data, key) {
const dataString = typeof data !== "string" ? this.getDataToSign(data) : data;
return this.calculateHmacSignature(dataString, key);
}
/**
* @deprecated use Use validateHMACSignature with correct parameter order instead
* Validate HMAC signature for Banking webhooks
* @param hmacKey
* @param hmacSign
* @param notification
* @returns
*/
validateBankingHMAC(hmacKey, hmacSign, notification) {
const expectedSign = (0, crypto_1.createHmac)(HmacValidator.HMAC_SHA256_ALGORITHM, Buffer.from(hmacSign, "hex")).update(notification, "utf8").digest("base64");
if ((hmacKey === null || hmacKey === void 0 ? void 0 : hmacKey.length) === expectedSign.length) {
return (0, crypto_1.timingSafeEqual)(Buffer.from(expectedSign, "base64"), Buffer.from(hmacKey, "base64"));
}
return false;
}
/**
* Validate HMAC signature for Banking/Management webhooks
* @param hmacKey HMAC key
* @param hmacSignature HMAC signature to validate
* @param data webhook payload (as string)
* @returns true when HMAC signature is valid
*/
validateHMACSignature(hmacKey, hmacSignature, data) {
const expectedSign = (0, crypto_1.createHmac)(HmacValidator.HMAC_SHA256_ALGORITHM, Buffer.from(hmacKey, "hex")).update(data, "utf8").digest("base64");
if ((hmacSignature === null || hmacSignature === void 0 ? void 0 : hmacSignature.length) === expectedSign.length) {
return (0, crypto_1.timingSafeEqual)(Buffer.from(expectedSign, "base64"), Buffer.from(hmacSignature, "base64"));
}
return false;
}
/**
* Validate HMAC signature for Payment webhooks
* @param notificationRequestItem webhook payload (as NotificationRequestItem object)
* @param key HMAC key
* @returns true when HMAC signature is valid
*/
validateHMAC(notificationRequestItem, key) {
var _a, _b;
if ((_a = notificationRequestItem.additionalData) === null || _a === void 0 ? void 0 : _a[apiConstants_1.ApiConstants.HMAC_SIGNATURE]) {
const expectedSign = this.calculateHmac(notificationRequestItem, key);
const merchantSign = (_b = notificationRequestItem.additionalData) === null || _b === void 0 ? void 0 : _b[apiConstants_1.ApiConstants.HMAC_SIGNATURE];
if ((merchantSign === null || merchantSign === void 0 ? void 0 : merchantSign.length) === expectedSign.length) {
return (0, crypto_1.timingSafeEqual)(Buffer.from(expectedSign, "base64"), Buffer.from(merchantSign, "base64"));
}
return false;
}
throw Error(`Missing ${apiConstants_1.ApiConstants.HMAC_SIGNATURE}`);
}
isNotificationRequestItem(item) {
return !Object.values(item).every((value) => typeof value === "string");
}
/**
* extract fields to be used to calculate the HMAC signature
* @param notificationRequestItem webhook payload
* @returns data to sign (as string)
*/
getDataToSign(notificationRequestItem) {
if (this.isNotificationRequestItem(notificationRequestItem)) {
const signedDataList = [];
signedDataList.push(notificationRequestItem.pspReference);
signedDataList.push(notificationRequestItem.originalReference);
signedDataList.push(notificationRequestItem.merchantAccountCode);
signedDataList.push(notificationRequestItem.merchantReference);
signedDataList.push(notificationRequestItem.amount.value);
signedDataList.push(notificationRequestItem.amount.currency);
signedDataList.push(notificationRequestItem.eventCode);
signedDataList.push(notificationRequestItem.success);
return signedDataList.join(HmacValidator.DATA_SEPARATOR);
}
else {
const keys = [];
const values = [];
const replacer = (str) => str.replace(/\\/g, "\\\\").replace(/:/g, "\\:");
Object.entries(notificationRequestItem).sort().forEach(([key, value]) => {
keys.push(replacer(key));
values.push(replacer(value));
});
return [...keys, ...values].join(HmacValidator.DATA_SEPARATOR);
}
}
calculateHmacSignature(data, key) {
const rawKey = Buffer.from(key, "hex");
return (0, crypto_1.createHmac)(HmacValidator.HMAC_SHA256_ALGORITHM, rawKey).update(data, "utf8").digest("base64");
}
}
HmacValidator.HMAC_SHA256_ALGORITHM = "sha256";
HmacValidator.DATA_SEPARATOR = ":";
exports.default = HmacValidator;
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