maskdata/lib/maskService/PasswordMask.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 PasswordMask {
  static maskPassword(password, options) {
    if (!password || typeof password === 'object') return password;
    password = password + '';
    if (options) {
      options = MaskHelper.mapWithDefaultValues(options, Constants.defaultPasswordMaskOptions);
      MaskHelper.validatePasswordOptions(options);
    } else {
      options = Constants.defaultPasswordMaskOptions;
    }
    let maskPasswordLength = password.length;
    if (options.fixedOutputLength !== undefined && options.fixedOutputLength >= 0) {
      maskPasswordLength = options.fixedOutputLength;
      if (password.length < options.fixedOutputLength) {
        password =
          password + `${options.maskWith}`.repeat(options.fixedOutputLength - password.length);
      }
    }
    if (password.length > options.maxMaskedCharacters) {
      maskPasswordLength = parseInt(options.maxMaskedCharacters);
    }
    const maskingCharacters =
      maskPasswordLength - options.unmaskedStartCharacters - options.unmaskedEndCharacters;

    if (maskingCharacters < 0) {
      if (maskPasswordLength <= options.unmaskedStartCharacters) {
        return password.substring(0, maskPasswordLength);
      } else {
        let maskedPassword = password.substring(0, options.unmaskedStartCharacters);
        const remainingChars = maskPasswordLength - options.unmaskedStartCharacters;
        for (let i = password.length - remainingChars; i < password.length; i++) {
          maskedPassword += password[i];
        }
        return maskedPassword;
      }
    }
    let maskedPassword = '';
    maskedPassword = password.substring(0, options.unmaskedStartCharacters);
    maskedPassword += `${options.maskWith}`.repeat(maskingCharacters);
    for (let i = password.length - options.unmaskedEndCharacters; i < password.length; i++) {
      maskedPassword += password[i];
    }
    return maskedPassword;
  }
}

module.exports = PasswordMask;