maskdata/lib/maskService/EmailMask.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 EmailMask {
  static maskEmail2(email, options) {
    if (!email || typeof email !== 'string') return email;
    let maskedEmail = '';
    options = options
      ? MaskHelper.mapWithDefaultValues(options, Constants.defaultEmailMask2Options)
      : Constants.defaultEmailMask2Options;
    MaskHelper.validateEmailOptions2(email, options);
    const indexOfAt = email.indexOf('@');
    // if(indexOfAt < 0) return email; // Not needed since we have the validation for mandatory '@'
    const [before, after] = email.split('@');
    const beforeLength = before.length;
    const afterLength = after.length;

    maskedEmail +=
      options.unmaskedStartCharactersBeforeAt >= beforeLength
        ? before
        : before.substring(0, options.unmaskedStartCharactersBeforeAt) +
          `${options.maskWith}`.repeat(beforeLength - options.unmaskedStartCharactersBeforeAt);

    maskedEmail += options.maskAtTheRate ? options.maskWith : '@';

    maskedEmail +=
      options.unmaskedEndCharactersAfterAt >= afterLength
        ? after
        : `${options.maskWith}`.repeat(afterLength - options.unmaskedEndCharactersAfterAt) +
          after.substring(afterLength - options.unmaskedEndCharactersAfterAt);
    return maskedEmail;
  }
}

module.exports = EmailMask;