Override OssnBlock 404 page

ossn_com.php

<?php
/**
 * Open Source Social Network
 *
 * @package   Open Source Social Network
 * @author    Open Social Website Core Team <[email protected]>
 * @copyright 2014 iNFORMATIKON TECHNOLOGIES
 * @license   General Public Licence http://www.opensource-socialnetwork.org/licence
 * @link      http://www.opensource-socialnetwork.org/licence
 */
 
function mynew_com(){
  //set priority to 1 so our call back loads before ossnblock
  ossn_register_callback('page', 'load:profile', 'mynew_com_block_check', 1);
}
function mynew_com_block_check($name, $type, $return, $params) {
    /*
    * Deny from visiting profile
    */
    if ($params['handler'] == 'u') {
        $user = ossn_user_by_username($params['page'][0]);
        if (OssnBlock::UserBlockCheck($user)) {
          ossn_trigger_message('You are blocked by user.', 'error');
          redirect(REF);
        }
    }
    /*
    * Deny from sending messages
    */
    if ($params['handler'] == 'messages' && isset($params['page'][1])) {
        $user = ossn_user_by_username($params['page'][1]);
        if ($user && OssnBlock::UserBlockCheck($user)) {
          ossn_trigger_message('You are blocked by user.', 'error');
          redirect(REF);
        }
    }
    /*
    * Deny from viewing user wall posts
    */
    if ($params['handler'] == 'post' && $params['page'][0] == 'view' && com_is_active('OssnWall')) {
        $post = new OssnWall;
        $post = $post->GetPost($params['page'][1]);
        $user = ossn_user_by_guid($post->owner_guid);
        if (OssnBlock::UserBlockCheck($user)) {
          ossn_trigger_message('You are blocked by user.', 'error');
          redirect(REF);
        }
    }
    /*
    * Deny from viewing profile photos album and albums
    */
    if ($params['handler'] == 'album') {
        //check if album is profile photos
        if ($params['page'][0] == 'profile') {
            $user = ossn_user_by_guid($params['page'][1]);
            //if album is not profile photos album then it means it simple album
        } elseif ($params['page'][0] == 'view') {
            $album = new OssnAlbums;
            $album = $album->GetAlbum($params['page'][1]);
            $user = ossn_user_by_guid($album->album->owner_guid);
        }
        if (isset($user) && OssnBlock::UserBlockCheck($user)) {
          ossn_trigger_message('You are blocked by user.', 'error');
          redirect(REF);
        }
    }
}
ossn_register_callback('ossn', 'init', 'mynew_com');