apple-pay-helper/Decryptor.js

A utility library for handling server side Apple Pay sessions and decrypting tokens.

const PaymentToken = require("./PaymentToken");

/**
 * Decryptor Class
 * Handles the logic to decrypt the Apple Pay token.
 */
class Decryptor {
  /**
   * Constructs an instance of Decryptor.
   * @param { import('./applePayHelperTypes').ApplePayConfig } config - Configuration object containing necessary parameters.
   */
  constructor(config) {
    this.config = config;
  }

  /**
   * Decrypts the Apple Pay token.
   * @param {import('./applePayHelperTypes').ApplePaymentResponse_PaymentData} token - The Apple Pay token to be decrypted.
   * @returns {Promise<import('./applePayHelperTypes').DecryptedTokenRaw>} - The decrypted token.
   */
  async decrypt(token) {
    try {
      const paymentToken = new PaymentToken(token);

      const {
        merchantCertOnlyPem,
        paymentProcessorPrivateKeyPem,
        isValidateExpirationDate,
        tokenExpirationWindow,
      } = this.config;

      const decrypted = paymentToken.decrypt(
        merchantCertOnlyPem,
        paymentProcessorPrivateKeyPem,
        isValidateExpirationDate,
        tokenExpirationWindow
      );

      return decrypted;
    } catch (error) {
      console.error("Error decrypting Apple Pay token:", error);
      throw error;
    }
  }
}

module.exports = Decryptor;