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./othercms/ips_4.3.4/system/Helpers/Form/Email.php
<?php
/**
 * @brief        Email input class for Form Builder
 * @author        <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright    (c) Invision Power Services, Inc.
 * @license        https://www.invisioncommunity.com/legal/standards/
 * @package        Invision Community
 * @since        11 Mar 2013
 */

namespace IPS\Helpers\Form;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
   
header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
    exit;
}

/**
 * Email input class for Form Builder
 */
class _Email extends Text
{
   
/**
     * @brief    Default Options
     * @code
         $childDefaultOptions = array(
             'accountEmail' => TRUE,    // If TRUE, additional checks will be performed to ensure provided email address is acceptable for use on a user's account. If an \IPS\Member object, that member will be excluded
         );
     * @endcode
     */
   
public $childDefaultOptions = array(
       
'accountEmail'    => FALSE,
    );
   
   
/**
     * Validate
     *
     * @throws    \InvalidArgumentException
     * @throws    \DomainException
     * @return    TRUE
     */
   
public function validate()
    {
       
parent::validate();
       
       
/* Check it's generally an acceptable email */
       
if ( $this->value !== '' and filter_var( $this->value, FILTER_VALIDATE_EMAIL ) === FALSE )
        {
            throw new \
InvalidArgumentException('form_email_bad');
        }
       
       
/* If it's for a user account, do additional checks */
       
if ( $this->options['accountEmail'] )
        {
           
/* Check if it exists */
           
if ( $error = \IPS\Login::emailIsInUse( $this->value, ( $this->options['accountEmail'] instanceof \IPS\Member ) ? $this->options['accountEmail'] : NULL, \IPS\Member::loggedIn()->isAdmin() ) )
            {
                throw new \
DomainException( $error );
            }


           
/* Check Banned and Allowed Emails only if the data are not coming from an administrator */
           
if ( !\IPS\Member::loggedIn()->isAdmin() )
            {
               
/* Check it's not a banned address */
               
foreach ( \IPS\Db::i()->select( 'ban_content', 'core_banfilters', array( "ban_type=?", 'email' ) ) as $bannedEmail )
                {
                    if (
preg_match( '/^' . str_replace( '\*', '.*', preg_quote( $bannedEmail, '/' ) ) . '$/i', $this->value ) )
                    {
                        throw new \
DomainException( 'form_email_banned' );
                    }
                }

               
/* Check it's an allowed domain */
               
if ( \IPS\Settings::i()->allowed_reg_email !== '' AND $allowedEmailDomains = explode( ',', \IPS\Settings::i()->allowed_reg_email )  )
                {
                   
$matched = FALSE;
                    foreach (
$allowedEmailDomains AS $domain )
                    {
                        if( \
mb_stripos( $this->value,  "@" . $domain ) !== FALSE )
                        {
                           
$matched = TRUE;
                        }
                    }

                    if (
count( $allowedEmailDomains ) AND !$matched )
                    {
                        throw new \
DomainException( 'form_email_banned' );
                    }
                }
            }
        }
    }
}