<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2015, 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. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://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 http://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($this->config['base_url']))
{
// The regular expression is only a basic validation for a valid "Host" header.
// It's not exhaustive, only checks for valid characters.
if (isset($_SERVER['HTTP_HOST']) && preg_match('/^((\[[0-9a-f:]+\])|(\d{1,3}(\.\d{1,3}){3})|[a-z0-9\-\.]+)(:\d+)?$/i', $_SERVER['HTTP_HOST']))
{
$base_url = (is_https() ? 'https' : 'http').'://'.$_SERVER['HTTP_HOST']
.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))
{
$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))
{
$base_url = $protocol.substr($base_url, strpos($base_url, '://'));
}

return $base_url.ltrim($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 ($this->item('enable_query_strings') === FALSE)
{
if (is_array($uri))
{
$uri = implode('/', $uri);
}
return trim($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;
}

}