Piler mailpiler.org - adding aliases on the fly

config-site.php

<?

// based on:
// https://www.mailpiler.org/wiki/current:custom-authentication

$config['CUSTOM_EMAIL_QUERY_FUNCTION'] = 'set_email_aliases';

function set_email_aliases($username = '') {
   $session = Registry::get('session');
   $data = $session->get("auth_data");

   // array of aliases per email login
   $aliases = [
     'example@example.com' => [
       'alias1',
       'alias2',
     ],
     'example2@example.com' => [
       'alias3',
       'alias4',
     ],
   ];

   // list of domains for aliases
   $domains = [
     'example1.com',
     'example2.com',
     'example3.com'
   ];
   
   // results
   // example@example.com -> example@example.com, alias1@example1.com, alias2@example1.com, alias1@example2.com, alias2@example2.com, alias1@example3.com, alias2@example3.com
   // example2@example.com -> example2@example.com, alias3@example1.com, alias4@example1.com, alias3@example2.com, alias4@example2.com, alias3@example3.com, alias4@example3.com

   if($data) {
     $current_email = is_array($data['emails']) ? $data['emails'][0] : $data['emails'];
     $current_aliases = in_array($current_email, array_keys($aliases)) ? $aliases[$current_email] : [];

     $current_emails = array();

     foreach($current_aliases as $alias) {
       foreach($domains as $domain) {
         array_push($current_emails, $alias.'@'.$domain);
       }
     }

     $data['emails'] = array_merge([$current_email], $current_emails);
     $session->set("auth_data", $data);
  }
}
?>