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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 - 2018, 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 - 2018, 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');

/**

 * Config Class

 *

 * This class contains functions that enable config files to be managed

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	Libraries

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/libraries/config.html

 */

class CI_Config {

	/**

	 * List of all loaded config values

	 *

	 * @var	array

	 */

	public $config = array();

	/**

	 * List of all loaded config files

	 *

	 * @var	array

	 */

	public $is_loaded =	array();

	/**

	 * List of paths to search when trying to load a config file.

	 *

	 * @used-by	CI_Loader

	 * @var		array

	 */

	public $_config_paths =	array(APPPATH);

	// --------------------------------------------------------------------

	/**

	 * Class constructor

	 *

	 * Sets the $config data from the primary config.php file as a class variable.

	 *

	 * @return	void

	 */

	public function __construct()

	{

		$this->config =& get_config();

		// Set the base_url automatically if none was provided

		if (empty($this->config['base_url']))

		{

			if (isset($_SERVER['SERVER_ADDR']))

			{

				if (strpos($_SERVER['SERVER_ADDR'], ':') !== FALSE)

				{

					$server_addr = '['.$_SERVER['SERVER_ADDR'].']';

				}

				else

				{

					$server_addr = $_SERVER['SERVER_ADDR'];

				}

				$base_url = (is_https() ? 'https' : 'http').'://'.$server_addr

					.substr($_SERVER['SCRIPT_NAME'], 0, strpos($_SERVER['SCRIPT_NAME'], basename($_SERVER['SCRIPT_FILENAME'])));

			}

			else

			{

				$base_url = 'http://localhost/';

			}

			$this->set_item('base_url', $base_url);

		}

		log_message('info', 'Config Class Initialized');

	}

	// --------------------------------------------------------------------

	/**

	 * Load Config File

	 *

	 * @param	string	$file			Configuration file name

	 * @param	bool	$use_sections		Whether configuration values should be loaded into their own section

	 * @param	bool	$fail_gracefully	Whether to just return FALSE or display an error message

	 * @return	bool	TRUE if the file was loaded correctly or FALSE on failure

	 */

	public function load($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)

	{

		$file = ($file === '') ? 'config' : str_replace('.php', '', $file);

		$loaded = FALSE;

		foreach ($this->_config_paths as $path)

		{

			foreach (array($file, ENVIRONMENT.DIRECTORY_SEPARATOR.$file) as $location)

			{

				$file_path = $path.'config/'.$location.'.php';

				if (in_array($file_path, $this->is_loaded, TRUE))

				{

					return TRUE;

				}

				if ( ! file_exists($file_path))

				{

					continue;

				}

				include($file_path);

				if ( ! isset($config) OR ! is_array($config))

				{

					if ($fail_gracefully === TRUE)

					{

						return FALSE;

					}

					show_error('Your '.$file_path.' file does not appear to contain a valid configuration array.');

				}

				if ($use_sections === TRUE)

				{

					$this->config[$file] = isset($this->config[$file])

						? array_merge($this->config[$file], $config)

						: $config;

				}

				else

				{

					$this->config = array_merge($this->config, $config);

				}

				$this->is_loaded[] = $file_path;

				$config = NULL;

				$loaded = TRUE;

				log_message('debug', 'Config file loaded: '.$file_path);

			}

		}

		if ($loaded === TRUE)

		{

			return TRUE;

		}

		elseif ($fail_gracefully === TRUE)

		{

			return FALSE;

		}

		show_error('The configuration file '.$file.'.php does not exist.');

	}

	// --------------------------------------------------------------------

	/**

	 * Fetch a config file item

	 *

	 * @param	string	$item	Config item name

	 * @param	string	$index	Index name

	 * @return	string|null	The configuration item or NULL if the item doesn't exist

	 */

	public function item($item, $index = '')

	{

		if ($index == '')

		{

			return isset($this->config[$item]) ? $this->config[$item] : NULL;

		}

		return isset($this->config[$index], $this->config[$index][$item]) ? $this->config[$index][$item] : NULL;

	}

	// --------------------------------------------------------------------

	/**

	 * Fetch a config file item with slash appended (if not empty)

	 *

	 * @param	string		$item	Config item name

	 * @return	string|null	The configuration item or NULL if the item doesn't exist

	 */

	public function slash_item($item)

	{

		if ( ! isset($this->config[$item]))

		{

			return NULL;

		}

		elseif (trim($this->config[$item]) === '')

		{

			return '';

		}

		return rtrim($this->config[$item], '/').'/';

	}

	// --------------------------------------------------------------------

	/**

	 * Site URL

	 *

	 * Returns base_url . index_page [. uri_string]

	 *

	 * @uses	CI_Config::_uri_string()

	 *

	 * @param	string|string[]	$uri	URI string or an array of segments

	 * @param	string	$protocol

	 * @return	string

	 */

	public function site_url($uri = '', $protocol = NULL)

	{

		$base_url = $this->slash_item('base_url');

		if (isset($protocol))

		{

			// For protocol-relative links

			if ($protocol === '')

			{

				$base_url = substr($base_url, strpos($base_url, '//'));

			}

			else

			{

				$base_url = $protocol.substr($base_url, strpos($base_url, '://'));

			}

		}

		if (empty($uri))

		{

			return $base_url.$this->item('index_page');

		}

		$uri = $this->_uri_string($uri);

		if ($this->item('enable_query_strings') === FALSE)

		{

			$suffix = isset($this->config['url_suffix']) ? $this->config['url_suffix'] : '';

			if ($suffix !== '')

			{

				if (($offset = strpos($uri, '?')) !== FALSE)

				{

					$uri = substr($uri, 0, $offset).$suffix.substr($uri, $offset);

				}

				else

				{

					$uri .= $suffix;

				}

			}

			return $base_url.$this->slash_item('index_page').$uri;

		}

		elseif (strpos($uri, '?') === FALSE)

		{

			$uri = '?'.$uri;

		}

		return $base_url.$this->item('index_page').$uri;

	}

	// -------------------------------------------------------------

	/**

	 * Base URL

	 *

	 * Returns base_url [. uri_string]

	 *

	 * @uses	CI_Config::_uri_string()

	 *

	 * @param	string|string[]	$uri	URI string or an array of segments

	 * @param	string	$protocol

	 * @return	string

	 */

	public function base_url($uri = '', $protocol = NULL)

	{

		$base_url = $this->slash_item('base_url');

		if (isset($protocol))

		{

			// For protocol-relative links

			if ($protocol === '')

			{

				$base_url = substr($base_url, strpos($base_url, '//'));

			}

			else

			{

				$base_url = $protocol.substr($base_url, strpos($base_url, '://'));

			}

		}

		return $base_url.$this->_uri_string($uri);

	}

	// -------------------------------------------------------------

	/**

	 * Build URI string

	 *

	 * @used-by	CI_Config::site_url()

	 * @used-by	CI_Config::base_url()

	 *

	 * @param	string|string[]	$uri	URI string or an array of segments

	 * @return	string

	 */

	protected function _uri_string($uri)

	{

		if ($this->item('enable_query_strings') === FALSE)

		{

			is_array($uri) && $uri = implode('/', $uri);

			return ltrim($uri, '/');

		}

		elseif (is_array($uri))

		{

			return http_build_query($uri);

		}

		return $uri;

	}

	// --------------------------------------------------------------------

	/**

	 * System URL

	 *

	 * @deprecated	3.0.0	Encourages insecure practices

	 * @return	string

	 */

	public function system_url()

	{

		$x = explode('/', preg_replace('|/*(.+?)/*$|', '\\1', BASEPATH));

		return $this->slash_item('base_url').end($x).'/';

	}

	// --------------------------------------------------------------------

	/**

	 * Set a config file item

	 *

	 * @param	string	$item	Config item key

	 * @param	string	$value	Config item value

	 * @return	void

	 */

	public function set_item($item, $value)

	{

		$this->config[$item] = $value;

	}

}