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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Hooks Class
*
* Provides a mechanism to extend the base system without hacking.
*
* @package CodeIgniter
* @subpackage Libraries
* @category Libraries
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/encryption.html
*/
class CI_Hooks {
/**
* Determines whether hooks are enabled
*
* @var bool
*/
public $enabled = FALSE;
/**
* List of all hooks set in config/hooks.php
*
* @var array
*/
public $hooks = array();
/**
* In progress flag
*
* Determines whether hook is in progress, used to prevent infinte loops
*
* @var bool
*/
protected $_in_progress = FALSE;
/**
* Class constructor
*
* @return void
*/
public function __construct()
{
$CFG =& load_class('Config', 'core');
log_message('debug', 'Hooks Class Initialized');
// If hooks are not enabled in the config file
// there is nothing else to do
if ($CFG->item('enable_hooks') === FALSE)
{
return;
}
// Grab the "hooks" definition file.
if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/hooks.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/hooks.php');
}
if (file_exists(APPPATH.'config/hooks.php'))
{
include(APPPATH.'config/hooks.php');
}
// If there are no hooks, we're done.
if ( ! isset($hook) OR ! is_array($hook))
{
return;
}
$this->hooks =& $hook;
$this->enabled = TRUE;
}
// --------------------------------------------------------------------
/**
* Call Hook
*
* Calls a particular hook. Called by CodeIgniter.php.
*
* @uses CI_Hooks::_run_hook()
*
* @param string $which Hook name
* @return bool TRUE on success or FALSE on failure
*/
public function call_hook($which = '')
{
if ( ! $this->enabled OR ! isset($this->hooks[$which]))
{
return FALSE;
}
if (isset($this->hooks[$which][0]) && is_array($this->hooks[$which][0]))
{
foreach ($this->hooks[$which] as $val)
{
$this->_run_hook($val);
}
}
else
{
$this->_run_hook($this->hooks[$which]);
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Run Hook
*
* Runs a particular hook
*
* @param array $data Hook details
* @return bool TRUE on success or FALSE on failure
*/
protected function _run_hook($data)
{
if ( ! is_array($data))
{
return FALSE;
}
// -----------------------------------
// Safety - Prevents run-away loops
// -----------------------------------
// If the script being called happens to have the same
// hook call within it a loop can happen
if ($this->_in_progress === TRUE)
{
return;
}
// -----------------------------------
// Set file path
// -----------------------------------
if ( ! isset($data['filepath'], $data['filename']))
{
return FALSE;
}
$filepath = APPPATH.$data['filepath'].'/'.$data['filename'];
if ( ! file_exists($filepath))
{
return FALSE;
}
// Determine and class and/or function names
$class = empty($data['class']) ? FALSE : $data['class'];
$function = empty($data['function']) ? FALSE : $data['function'];
$params = isset($data['params']) ? $data['params'] : '';
if (empty($function))
{
return FALSE;
}
// Set the _in_progress flag
$this->_in_progress = TRUE;
// Call the requested class and/or function
if ($class !== FALSE)
{
class_exists($class, FALSE) OR require_once($filepath);
if ( ! class_exists($class, FALSE) OR ! method_exists($class, $function))
{
return $this->_in_progress = FALSE;
}
$HOOK = new $class();
$HOOK->$function($params);
}
else
{
function_exists($function) OR require_once($filepath);
if ( ! function_exists($function))
{
return $this->_in_progress = FALSE;
}
$function($params);
}
$this->_in_progress = FALSE;
return TRUE;
}
}
/* End of file Hooks.php */
/* Location: ./system/core/Hooks.php */
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