<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



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



/**

 * URI Class

 *

 * Parses URIs and determines routing

 *

 * @package		CodeIgniter

 * @subpackage	Libraries

 * @category	URI

 * @author		ExpressionEngine Dev Team

 * @link		http://codeigniter.com/user_guide/libraries/uri.html

 */

class CI_URI {



	/**

	 * List of cached uri segments

	 *

	 * @var array

	 * @access public

	 */

	var	$keyval			= array();

	/**

	 * Current uri string

	 *

	 * @var string

	 * @access public

	 */

	var $uri_string;

	/**

	 * List of uri segments

	 *

	 * @var array

	 * @access public

	 */

	var $segments		= array();

	/**

	 * Re-indexed list of uri segments

	 * Starts at 1 instead of 0

	 *

	 * @var array

	 * @access public

	 */

	var $rsegments		= array();



	/**

	 * Constructor

	 *

	 * Simply globalizes the $RTR object.  The front

	 * loads the Router class early on so it's not available

	 * normally as other classes are.

	 *

	 * @access	public

	 */

	function __construct()

	{

		$this->config =& load_class('Config', 'core');

		log_message('debug', "URI Class Initialized");

	}





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



	/**

	 * Get the URI String

	 *

	 * @access	private

	 * @return	string

	 */

	function _fetch_uri_string()

	{

		if (strtoupper($this->config->item('uri_protocol')) == 'AUTO')

		{

			// Is the request coming from the command line?

			if (php_sapi_name() == 'cli' or defined('STDIN'))

			{

				$this->_set_uri_string($this->_parse_cli_args());

				return;

			}



			// Let's try the REQUEST_URI first, this will work in most situations

			if ($uri = $this->_detect_uri())

			{

				$this->_set_uri_string($uri);

				return;

			}



			// Is there a PATH_INFO variable?

			// Note: some servers seem to have trouble with getenv() so we'll test it two ways

			$path = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : @getenv('PATH_INFO');

			if (trim($path, '/') != '' && $path != "/".SELF)

			{

				$this->_set_uri_string($path);

				return;

			}



			// No PATH_INFO?... What about QUERY_STRING?

			$path =  (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING');

			if (trim($path, '/') != '')

			{

				$this->_set_uri_string($path);

				return;

			}



			// As a last ditch effort lets try using the $_GET array

			if (is_array($_GET) && count($_GET) == 1 && trim(key($_GET), '/') != '')

			{

				$this->_set_uri_string(key($_GET));

				return;

			}



			// We've exhausted all our options...

			$this->uri_string = '';

			return;

		}



		$uri = strtoupper($this->config->item('uri_protocol'));



		if ($uri == 'REQUEST_URI')

		{

			$this->_set_uri_string($this->_detect_uri());

			return;

		}

		elseif ($uri == 'CLI')

		{

			$this->_set_uri_string($this->_parse_cli_args());

			return;

		}



		$path = (isset($_SERVER[$uri])) ? $_SERVER[$uri] : @getenv($uri);

		$this->_set_uri_string($path);

	}



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



	/**

	 * Set the URI String

	 *

	 * @access	public

	 * @param 	string

	 * @return	string

	 */

	function _set_uri_string($str)

	{

		// Filter out control characters

		$str = remove_invisible_characters($str, FALSE);



		// If the URI contains only a slash we'll kill it

		$this->uri_string = ($str == '/') ? '' : $str;

	}



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



	/**

	 * Detects the URI

	 *

	 * This function will detect the URI automatically and fix the query string

	 * if necessary.

	 *

	 * @access	private

	 * @return	string

	 */

	private function _detect_uri()

	{

		if ( ! isset($_SERVER['REQUEST_URI']) OR ! isset($_SERVER['SCRIPT_NAME']))

		{

			return '';

		}



		$uri = $_SERVER['REQUEST_URI'];

		if (strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)

		{

			$uri = substr($uri, strlen($_SERVER['SCRIPT_NAME']));

		}

		elseif (strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)

		{

			$uri = substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));

		}



		// This section ensures that even on servers that require the URI to be in the query string (Nginx) a correct

		// URI is found, and also fixes the QUERY_STRING server var and $_GET array.

		if (strncmp($uri, '?/', 2) === 0)

		{

			$uri = substr($uri, 2);

		}

		$parts = preg_split('#\?#i', $uri, 2);

		$uri = $parts[0];

		if (isset($parts[1]))

		{

			$_SERVER['QUERY_STRING'] = $parts[1];

			parse_str($_SERVER['QUERY_STRING'], $_GET);

		}

		else

		{

			$_SERVER['QUERY_STRING'] = '';

			$_GET = array();

		}



		if ($uri == '/' || empty($uri))

		{

			return '/';

		}



		$uri = parse_url($uri, PHP_URL_PATH);



		// Do some final cleaning of the URI and return it

		return str_replace(array('//', '../'), '/', trim($uri, '/'));

	}



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



	/**

	 * Parse cli arguments

	 *

	 * Take each command line argument and assume it is a URI segment.

	 *

	 * @access	private

	 * @return	string

	 */

	private function _parse_cli_args()

	{

		$args = array_slice($_SERVER['argv'], 1);



		return $args ? '/' . implode('/', $args) : '';

	}



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



	/**

	 * Filter segments for malicious characters

	 *

	 * @access	private

	 * @param	string

	 * @return	string

	 */

	function _filter_uri($str)

	{

		if ($str != '' && $this->config->item('permitted_uri_chars') != '' && $this->config->item('enable_query_strings') == FALSE)

		{

			// preg_quote() in PHP 5.3 escapes -, so the str_replace() and addition of - to preg_quote() is to maintain backwards

			// compatibility as many are unaware of how characters in the permitted_uri_chars will be parsed as a regex pattern

			if ( ! preg_match("|^[".str_replace(array('\\-', '\-'), '-', preg_quote($this->config->item('permitted_uri_chars'), '-'))."]+$|i", $str))

			{

				show_error('The URI you submitted has disallowed characters.', 400);

			}

		}



		// Convert programatic characters to entities

		$bad	= array('$',		'(',		')',		'%28',		'%29');

		$good	= array('&#36;',	'&#40;',	'&#41;',	'&#40;',	'&#41;');



		return str_replace($bad, $good, $str);

	}



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



	/**

	 * Remove the suffix from the URL if needed

	 *

	 * @access	private

	 * @return	void

	 */

	function _remove_url_suffix()

	{

		if  ($this->config->item('url_suffix') != "")

		{

			$this->uri_string = preg_replace("|".preg_quote($this->config->item('url_suffix'))."$|", "", $this->uri_string);

		}

	}



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



	/**

	 * Explode the URI Segments. The individual segments will

	 * be stored in the $this->segments array.

	 *

	 * @access	private

	 * @return	void

	 */

	function _explode_segments()

	{

		foreach (explode("/", preg_replace("|/*(.+?)/*$|", "\\1", $this->uri_string)) as $val)

		{

			// Filter segments for security

			$val = trim($this->_filter_uri($val));



			if ($val != '')

			{

				$this->segments[] = $val;

			}

		}

	}



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

	/**

	 * Re-index Segments

	 *

	 * This function re-indexes the $this->segment array so that it

	 * starts at 1 rather than 0.  Doing so makes it simpler to

	 * use functions like $this->uri->segment(n) since there is

	 * a 1:1 relationship between the segment array and the actual segments.

	 *

	 * @access	private

	 * @return	void

	 */

	function _reindex_segments()

	{

		array_unshift($this->segments, NULL);

		array_unshift($this->rsegments, NULL);

		unset($this->segments[0]);

		unset($this->rsegments[0]);

	}



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



	/**

	 * Fetch a URI Segment

	 *

	 * This function returns the URI segment based on the number provided.

	 *

	 * @access	public

	 * @param	integer

	 * @param	bool

	 * @return	string

	 */

	function segment($n, $no_result = FALSE)

	{

		return ( ! isset($this->segments[$n])) ? $no_result : $this->segments[$n];

	}



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



	/**

	 * Fetch a URI "routed" Segment

	 *

	 * This function returns the re-routed URI segment (assuming routing rules are used)

	 * based on the number provided.  If there is no routing this function returns the

	 * same result as $this->segment()

	 *

	 * @access	public

	 * @param	integer

	 * @param	bool

	 * @return	string

	 */

	function rsegment($n, $no_result = FALSE)

	{

		return ( ! isset($this->rsegments[$n])) ? $no_result : $this->rsegments[$n];

	}



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



	/**

	 * Generate a key value pair from the URI string

	 *

	 * This function generates and associative array of URI data starting

	 * at the supplied segment. For example, if this is your URI:

	 *

	 *	example.com/user/search/name/joe/location/UK/gender/male

	 *

	 * You can use this function to generate an array with this prototype:

	 *

	 * array (

	 *			name => joe

	 *			location => UK

	 *			gender => male

	 *		 )

	 *

	 * @access	public

	 * @param	integer	the starting segment number

	 * @param	array	an array of default values

	 * @return	array

	 */

	function uri_to_assoc($n = 3, $default = array())

	{

		return $this->_uri_to_assoc($n, $default, 'segment');

	}

	/**

	 * Identical to above only it uses the re-routed segment array

	 *

	 * @access 	public

	 * @param 	integer	the starting segment number

	 * @param 	array	an array of default values

	 * @return 	array

	 *

	 */

	function ruri_to_assoc($n = 3, $default = array())

	{

		return $this->_uri_to_assoc($n, $default, 'rsegment');

	}



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



	/**

	 * Generate a key value pair from the URI string or Re-routed URI string

	 *

	 * @access	private

	 * @param	integer	the starting segment number

	 * @param	array	an array of default values

	 * @param	string	which array we should use

	 * @return	array

	 */

	function _uri_to_assoc($n = 3, $default = array(), $which = 'segment')

	{

		if ($which == 'segment')

		{

			$total_segments = 'total_segments';

			$segment_array = 'segment_array';

		}

		else

		{

			$total_segments = 'total_rsegments';

			$segment_array = 'rsegment_array';

		}



		if ( ! is_numeric($n))

		{

			return $default;

		}



		if (isset($this->keyval[$n]))

		{

			return $this->keyval[$n];

		}



		if ($this->$total_segments() < $n)

		{

			if (count($default) == 0)

			{

				return array();

			}



			$retval = array();

			foreach ($default as $val)

			{

				$retval[$val] = FALSE;

			}

			return $retval;

		}



		$segments = array_slice($this->$segment_array(), ($n - 1));



		$i = 0;

		$lastval = '';

		$retval  = array();

		foreach ($segments as $seg)

		{

			if ($i % 2)

			{

				$retval[$lastval] = $seg;

			}

			else

			{

				$retval[$seg] = FALSE;

				$lastval = $seg;

			}



			$i++;

		}



		if (count($default) > 0)

		{

			foreach ($default as $val)

			{

				if ( ! array_key_exists($val, $retval))

				{

					$retval[$val] = FALSE;

				}

			}

		}



		// Cache the array for reuse

		$this->keyval[$n] = $retval;

		return $retval;

	}



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



	/**

	 * Generate a URI string from an associative array

	 *

	 *

	 * @access	public

	 * @param	array	an associative array of key/values

	 * @return	array

	 */

	function assoc_to_uri($array)

	{

		$temp = array();

		foreach ((array)$array as $key => $val)

		{

			$temp[] = $key;

			$temp[] = $val;

		}



		return implode('/', $temp);

	}



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



	/**

	 * Fetch a URI Segment and add a trailing slash

	 *

	 * @access	public

	 * @param	integer

	 * @param	string

	 * @return	string

	 */

	function slash_segment($n, $where = 'trailing')

	{

		return $this->_slash_segment($n, $where, 'segment');

	}



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



	/**

	 * Fetch a URI Segment and add a trailing slash

	 *

	 * @access	public

	 * @param	integer

	 * @param	string

	 * @return	string

	 */

	function slash_rsegment($n, $where = 'trailing')

	{

		return $this->_slash_segment($n, $where, 'rsegment');

	}



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



	/**

	 * Fetch a URI Segment and add a trailing slash - helper function

	 *

	 * @access	private

	 * @param	integer

	 * @param	string

	 * @param	string

	 * @return	string

	 */

	function _slash_segment($n, $where = 'trailing', $which = 'segment')

	{

		$leading	= '/';

		$trailing	= '/';



		if ($where == 'trailing')

		{

			$leading	= '';

		}

		elseif ($where == 'leading')

		{

			$trailing	= '';

		}



		return $leading.$this->$which($n).$trailing;

	}



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



	/**

	 * Segment Array

	 *

	 * @access	public

	 * @return	array

	 */

	function segment_array()

	{

		return $this->segments;

	}



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



	/**

	 * Routed Segment Array

	 *

	 * @access	public

	 * @return	array

	 */

	function rsegment_array()

	{

		return $this->rsegments;

	}



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



	/**

	 * Total number of segments

	 *

	 * @access	public

	 * @return	integer

	 */

	function total_segments()

	{

		return count($this->segments);

	}



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



	/**

	 * Total number of routed segments

	 *

	 * @access	public

	 * @return	integer

	 */

	function total_rsegments()

	{

		return count($this->rsegments);

	}



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



	/**

	 * Fetch the entire URI string

	 *

	 * @access	public

	 * @return	string

	 */

	function uri_string()

	{

		return $this->uri_string;

	}





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



	/**

	 * Fetch the entire Re-routed URI string

	 *

	 * @access	public

	 * @return	string

	 */

	function ruri_string()

	{

		return '/'.implode('/', $this->rsegment_array());

	}



}

// END URI Class



/* End of file URI.php */

/* Location: ./system/core/URI.php */