<?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');

/**
 * Input Class
 *
 * Pre-processes global input data for security
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Input
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/input.html
 */
class MY_Input extends CI_Input
{

	/**
	 * Fetch from array
	 *
	 * Internal method used to retrieve values from global arrays.
	 *
	 * @param	array	&$array		$_GET, $_POST, $_COOKIE, $_SERVER, etc.
	 * @param	mixed	$index		Index for item to be fetched from $array
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	protected function _fetch_from_array(&$array, $index = NULL, $xss_clean = NULL, $default_value =NULL)
	{
		is_bool($xss_clean) OR $xss_clean = $this->_enable_xss;

		// If $index is NULL, it means that the whole $array is requested
		isset($index) OR $index = array_keys($array);

		// allow fetching multiple keys at once
		if (is_array($index))
		{
			$output = array();
			foreach ($index as $key)
			{
				$output[$key] = $this->_fetch_from_array($array, $key, $xss_clean);
			}

			return $output;
		}

		if (isset($array[$index]))
		{
			$value = $array[$index];
		}
		elseif (($count = preg_match_all('/(?:^[^\[]+)|\[[^]]*\]/', $index, $matches)) > 1) // Does the index contain array notation
		{
			$value = $array;
			for ($i = 0; $i < $count; $i++)
			{
				$key = trim($matches[0][$i], '[]');
				if ($key === '') // Empty notation will return the value as array
				{
					break;
				}

				if (isset($value[$key]))
				{
					$value = $value[$key];
				}
				else
				{
					return $default_value;
				}
			}
		}
		else
		{
			return $default_value;
		}

		return ($xss_clean === TRUE)
			? $this->security->xss_clean($value)
			: $value;
	}

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

	/**
	 * Fetch an item from the GET array
	 *
	 * @param	mixed	$index		Index for item to be fetched from $_GET
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function get($index = NULL, $xss_clean = NULL, $default_value = NULL)
	{
		return $this->_fetch_from_array($_GET, $index, $xss_clean, $default_value);
	}

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

	/**
	 * Fetch an item from the POST array
	 *
	 * @param	mixed	$index		Index for item to be fetched from $_POST
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function post($index = NULL, $xss_clean = NULL, $default_value = NULL)
	{
		return $this->_fetch_from_array($_POST, $index, $xss_clean, $default_value);
	}

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

	/**
	 * Fetch an item from POST data with fallback to GET
	 *
	 * @param	string	$index		Index for item to be fetched from $_POST or $_GET
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function post_get($index, $xss_clean = NULL, $default_value = NULL)
	{
		return isset($_POST[$index])
			? $this->post($index, $xss_clean, $default_value)
			: $this->get($index, $xss_clean, $default_value);
	}

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

	/**
	 * Fetch an item from GET data with fallback to POST
	 *
	 * @param	string	$index		Index for item to be fetched from $_GET or $_POST
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function get_post($index, $xss_clean = NULL, $default_value = NULL)
	{
		return isset($_GET[$index])
			? $this->get($index, $xss_clean, $default_value)
			: $this->post($index, $xss_clean, $default_value);
	}

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

	/**
	 * Fetch an item from the COOKIE array
	 *
	 * @param	mixed	$index		Index for item to be fetched from $_COOKIE
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function cookie($index = NULL, $xss_clean = NULL, $default_value = NULL)
	{
		return $this->_fetch_from_array($_COOKIE, $index, $xss_clean, $default_value);
	}

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

	/**
	 * Fetch an item from the SERVER array
	 *
	 * @param	mixed	$index		Index for item to be fetched from $_SERVER
	 * @param	bool	$xss_clean	Whether to apply XSS filtering
	 * @return	mixed
	 */
	public function server($index, $xss_clean = NULL, $default_value = NULL)
	{
		return $this->_fetch_from_array($_SERVER, $index, $xss_clean, $default_value);
	}

}
