api-beep-onboarding/lib/generators.js

Oracle OCI FaaS for Api Beep Onboarding library

/**
 *
 * BeePay 2.023-2.024 - Oracle OCI FaaS for Api Beep Onboarding
 *                      Merchant ID. and Merchant AMEX generator with Luhn Algorithm
 *
 * Changes:
 *    jlugo: 2023-dic-15. File creation
 *    jlugo: 2024-apr-25. Moved to a library
 */

/* RGVzYXJyb2xsYWRvIHBvciBKb25hdGhhbiBMdWdv */
import luhn from "luhn-generator";

/**
 * Merchant ID. and Merchant AMEX generator with Luhn Algorithm
 */
export class Generator {

   static AmexRange = 219;

   static GenType = {
               Merchant: 8,
               Amex: 5
            };

   /**
    * 
    * @param {String} bankCode - Financial institution bank code (2-digits). e.g.: 51
    * @param {*} amexCode - AMEX bank ID. e.g.: 7
    */
   constructor(bankCode, amexCode) {
      this.bankCode = bankCode?.length > 2 ? bankCode.slice(-2) : bankCode;
      this.amexCode = amexCode;
   }

   /**
    * Generate a valid Merchant ID. with Luhn Algorithm
    *
    * @returns {String}
    */
   genMerchantId() {

      let id = "";
      do {

         let tmp = `${this.bankCode}${luhn.random(Generator.GenType.Merchant)}`;
         let checksum = luhn.checksum(tmp);

         id = tmp + checksum;

      } while (!luhn.validate(id))

      this.merchantId = id;

      return this.merchantId;
   }

   /**
    * Generate a valid Merchant ID for AMEX with Luhn Algorithm
    * 
    * @param {String} amexCode - AMEX code
    * @returns {String}
    */
   genMerchantAmex() {
      let id = "";
      const rangeStart = 21920000; // Inicio del rango
      const rangeEnd = 21926999;   // Fin del rango
      
  
      do {
          // Genera los primeros 9 dígitos dentro del rango
          const randomBase = Math.floor(Math.random() * (rangeEnd - rangeStart + 1)) + rangeStart;
  
          // Calcula el checksum usando Luhn
          const checksum = luhn.checksum(randomBase.toString());
  
          // Combina el número base con el checksum
          id = randomBase.toString() + checksum;
  
      } while (!luhn.validate(id));
  
      this.merchantAmexId = `${this.amexCode}${id}`;
      return this.merchantAmexId;
  }
}

export default Generator;