Subversion-Projekte lars-tiefland.ci

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://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;
        }

}