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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2019, British Columbia Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/) * @license https://opensource.org/licenses/MIT MIT License * @link https://codeigniter.com * @since Version 1.0.0 * @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 https://codeigniter.com/user_guide/general/hooks.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(); /** * Array with class objects to use hooks methods * * @var array */ protected $_objects = 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() { $CFG =& load_class('Config', 'core'); log_message('info', 'Hooks Class Initialized'); // If hooks are not enabled in the config file // there is nothing else to do if ($CFG->item('enable_hooks') === FALSE) { return; } // Grab the "hooks" definition file. if (file_exists(APPPATH.'config/hooks.php')) { include(APPPATH.'config/hooks.php'); } if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/hooks.php')) { include(APPPATH.'config/'.ENVIRONMENT.'/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[$which])) { return FALSE; } if (is_array($this->hooks[$which]) && ! isset($this->hooks[$which]['function'])) { foreach ($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) { // Closures/lambda functions and array($object, 'method') callables if (is_callable($data)) { is_array($data) ? $data[0]->{$data[1]}() : $data(); return TRUE; } elseif ( ! is_array($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) { // The object is stored? if (isset($this->_objects[$class])) { if (method_exists($this->_objects[$class], $function)) { $this->_objects[$class]->$function($params); } else { return $this->_in_progress = FALSE; } } else { class_exists($class, FALSE) OR require_once($filepath); if ( ! class_exists($class, FALSE) OR ! method_exists($class, $function)) { return $this->_in_progress = FALSE; } // Store the object and execute the method $this->_objects[$class] = new $class(); $this->_objects[$class]->$function($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; } }
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