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./othercms/ips_4.3.4/applications/core/modules/front/system/unsubscribe.php
<?php
/**
 * @brief        Allow users to unsubscribe from site updates
 * @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        12 Jun 2013
 */

namespace IPS\core\modules\front\system;

/* 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;
}

/**
 * Unsubscribe
 */
class _unsubscribe extends \IPS\Dispatcher\Controller
{
   
/**
     * Unsubscribe the user
     *
     * @return    void
     */
   
protected function manage()
    {
       
/* Get the member being requested */
       
if( empty( \IPS\Request::i()->email ) )
        {
            \
IPS\Output::i()->error( 'no_user_to_unsubscribe', '2S127/3', 404, '' );
        }

       
$member    = \IPS\Member::load( \IPS\Request::i()->email, 'email' );

        if( !
$member->member_id )
        {
            \
IPS\Output::i()->error( 'no_user_to_unsubscribe', '2S127/2', 404, '' );
        }

       
/* Verify the key is correct */
       
if ( \IPS\Login::compareHashes( md5( $member->email . ':' . $member->members_pass_hash ), (string) \IPS\Request::i()->key ) )
        {
           
/* Set the member not to receive future emails */
           
$member->allow_admin_mails    = 0;
           
$member->save();

           
/* Log it */
           
$member->logHistory( 'core', 'admin_mails', array( 'enabled' => FALSE ) );

           
/* And then show them a confirmation screen */
           
\IPS\Output::i()->title = \IPS\Member::loggedIn()->language()->addToStack('unsubscribed');
            \
IPS\Output::i()->output = \IPS\Theme::i()->getTemplate( 'system' )->unsubscribed();
        }
        else
        {
           
/* Key did not match */
           
\IPS\Output::i()->error( 'no_user_to_unsubscribe', '3S127/4', 403, '' );
        }
    }
}