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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;

	}

}