maskdata/lib/maskService/CardMask.js

Node module to mask various kinds of data in the required formats

'use strict';
const MaskHelper = require('../helpers/MaskHelper');
const Constants = require('../helpers/Constants');

class CardMask {
  static maskCard(card, options) {
    if (!card) return card;
    let cardToProcess = (card + '').trim();
    if (options) {
      options = MaskHelper.mapWithDefaultValues(options, Constants.defaultCardMaskOptions);
      MaskHelper.validateCardMaskOptions(options, cardToProcess.length);
    } else {
      options = Constants.defaultCardMaskOptions;
    }
    let countOfNumbers = 0;
    let lastIndex = 0;
    let flag = true;
    for (let i = cardToProcess.length - 1; i >= 0; i--) {
      if (!isNaN(cardToProcess[i])) {
        if (flag && countOfNumbers === options.unmaskedEndDigits) {
          lastIndex = i;
          flag = false;
        }
        countOfNumbers++;
      }
    }
    if (options.unmaskedStartDigits + options.unmaskedEndDigits >= countOfNumbers) {
      return cardToProcess;
    }
    let maskedCard = '';
    let i = 0;
    let j = 0;
    while (i < options.unmaskedStartDigits) {
      if (!isNaN(cardToProcess[j])) {
        i++;
      }
      maskedCard += cardToProcess[j++];
    }

    while (j <= lastIndex) {
      if (isNaN(parseInt(cardToProcess[j]))) {
        maskedCard += cardToProcess[j];
      } else {
        maskedCard += options.maskWith;
      }
      j++;
    }

    i = 0;
    j = lastIndex + 1;
    while (i < options.unmaskedEndDigits) {
      if (!isNaN(cardToProcess[j])) {
        i++;
      }
      maskedCard += cardToProcess[j++];
    }
    return maskedCard;
  }
}

module.exports = CardMask;