index.js

'use strict';

/*
  Copyright (C) 2022 Mindbaz
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  
  --
  
  Change receivers in header for dryrun purpose
  Header must include 'configured header' = 'yes' to be triggered
*/

module.exports.title = 'Dry Run mode';

/**
 * Send mail to differrent user by changing header based on configuration file
 * If multiples users are provided in configuration file, function will randomly choose
 * one from read and fake receivers concatanated
 * 
 * @param {Object} app 
 * @param {Object} done 
 */
module.exports.init = ( app, done ) => {
    app.addHook ( 'message:headers', ( envelope, messageInfo, next ) => {
        if ( envelope.headers.getFirst ( app.config.header ).toLowerCase () === 'yes' ) {
            let realReceivers = app.config.receivers;
            let receivers = realReceivers.concat ( app.config.fakeReceivers );
            let receiverNumber = receivers.length;
            if ( receiverNumber < 2 ) {
                next ( new Error ( 'No receivers found in config' ) );
            }
            let sender = app.config.sender;
            let mailToUse = receivers [ Math.random () * ( receiverNumber ) | 0 ];
            envelope [ 'from' ] = sender;
            envelope [ 'to' ] =  [ mailToUse ];
            envelope [ 'parsedEnvelope' ] [ 'to' ] =  [ mailToUse ];
            envelope [ 'parsedEnvelope' ] [ 'from' ] = sender;
            envelope.headers.update ( 'to',  [ mailToUse ] );
            envelope.headers.update ( 'from', sender );
            envelope.headers.update ( 'Delivered-To',  [ mailToUse ] );
        }
        next ();
    } );
    done ();
}