uri.php

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<?php
/**
 * @version		$Id: uri.php 10214 2008-04-19 08:59:04Z eddieajau $
 * @package		Joomla.Framework
 * @subpackage	Environment
 * @copyright	Copyright (C) 2005 - 2008 Open Source Matters. All rights reserved.
 * @license		GNU/GPL, see LICENSE.php
 * Joomla! is free software. This version may have been modified pursuant
 * to the GNU General Public License, and as distributed it includes or
 * is derivative of works licensed under the GNU General Public License or
 * other free or open source software licenses.
 * See COPYRIGHT.php for copyright notices and details.
 */

// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();

/**
 * JURI Class
 *
 * This class serves two purposes.  First to parse a URI and provide a common interface
 * for the Joomla Framework to access and manipulate a URI.  Second to attain the URI of
 * the current executing script from the server regardless of server.
 *
 * @author		Louis Landry <[e-mail]>
 * @package		Joomla.Framework
 * @subpackage	Environment
 * @since		1.5
 */
class JURI extends JObject
{
	/**
	 * Original URI
	 *
	 * @var		string
	 */
	var $_uri = null;

	/**
	 * Protocol
	 *
	 * @var		string
	 */
	var $_scheme = null;

	/**
	 * Host
	 *
	 * @var		string
	 */
	var $_host = null;

	/**
	 * Port
	 *
	 * @var		integer
	 */
	var $_port = null;

	/**
	 * Username
	 *
	 * @var		string
	 */
	var $_user = null;

	/**
	 * Password
	 *
	 * @var		string
	 */
	var $_pass = null;

	/**
	 * Path
	 *
	 * @var		string
	 */
	var $_path = null;

	/**
	 * Query
	 *
	 * @var		string
	 */
	var $_query = null;

	/**
	 * Anchor
	 *
	 * @var		string
	 */
	var $_fragment = null;

	/**
	 * Query variable hash
	 *
	 * @var		array
	 */
	var $_vars = array ();

	/**
	 * Constructor.
	 * You can pass a URI string to the constructor to initialize a specific URI.
	 *
	 * @param	string $uri The optional URI string
	 */
	function __construct($uri = null)
	{
		if ($uri !== null) {
			$this->parse($uri);
		}
	}

	/**
	 * Returns a reference to a global JURI object, only creating it
	 * if it doesn't already exist.
	 *
	 * This method must be invoked as:
	 * 		<pre>  $uri =& JURI::getInstance([$uri]);</pre>
	 *
	 * @static
	 * @param	string $uri The URI to parse.  [optional: if null uses script URI]
	 * @return	JURI  The URI object.
	 * @since	1.5
	 */
	function &getInstance($uri = 'SERVER')
	{
		static $instances = array();

		if (!isset ($instances[$uri]))
		{
			// Are we obtaining the URI from the server?
			if ($uri == 'SERVER')
			{
				// Determine if the request was over SSL (HTTPS)
				if (isset($_SERVER['HTTPS']) && !empty($_SERVER['HTTPS']) && (strtolower($_SERVER['HTTPS']) != 'off')) {
					$https = 's://';
				} else {
					$https = '://';
				}

				/*
				 * Since we are assigning the URI from the server variables, we first need
				 * to determine if we are running on apache or IIS.  If PHP_SELF and REQUEST_URI
				 * are present, we will assume we are running on apache.
				 */
				if (!empty ($_SERVER['PHP_SELF']) && !empty ($_SERVER['REQUEST_URI'])) {

					/*
					 * To build the entire URI we need to prepend the protocol, and the http host
					 * to the URI string.
					 */
					$theURI = 'http' . $https . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

				/*
				 * Since we do not have REQUEST_URI to work with, we will assume we are
				 * running on IIS and will therefore need to work some magic with the SCRIPT_NAME and
				 * QUERY_STRING environment variables.
				 */
				}
				 else
				 {
					// IIS uses the SCRIPT_NAME variable instead of a REQUEST_URI variable... thanks, MS
					$theURI = 'http' . $https . $_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'];

					// If the query string exists append it to the URI string
					if (isset($_SERVER['QUERY_STRING']) && !empty($_SERVER['QUERY_STRING'])) {
						$theURI .= '?' . $_SERVER['QUERY_STRING'];
					}
				}

				// Now we need to clean what we got since we can't trust the server var
				$theURI = urldecode($theURI);
				$theURI = str_replace('"', '&quot;',$theURI);
				$theURI = str_replace('<', '&lt;',$theURI);
				$theURI = str_replace('>', '&gt;',$theURI);
				$theURI = preg_replace('/eval\((.*)\)/', '', $theURI);
				$theURI = preg_replace('/[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']/', '""', $theURI);
			}
			else
			{
				// We were given a URI
				$theURI = $uri;
			}

			// Create the new JURI instance
			$instances[$uri] = new JURI($theURI);
		}
		return $instances[$uri];
	}

	/**
	 * Returns the base URI for the request.
	 *
	 * @access	public
	 * @static
	 * @param	boolean $pathonly If false, prepend the scheme, host and port information. Default is false.
	 * @return	string	The base URI string
	 * @since	1.5
	 */
	function base($pathonly = false)
	{
		static $base;

		// Get the base request path
		if (!isset($base))
		{
			$config =& JFactory::getConfig();
			$live_site = $config->getValue('config.live_site');
			if(trim($live_site) != '') {
				$uri =& JURI::getInstance($live_site);
				$base['prefix'] = $uri->toString( array('scheme', 'host', 'port'));
				$base['path'] = rtrim($uri->toString( array('path')), '/\\');
				if(JPATH_BASE == JPATH_ADMINISTRATOR) {
					$base['path'] .= '/administrator';
				}
			} else {
				$uri	         =& JURI::getInstance();
				$base['prefix'] = $uri->toString( array('scheme', 'host', 'port'));

				if (strpos(php_sapi_name(), 'cgi') !== false && !empty($_SERVER['REQUEST_URI'])) {
					//Apache CGI
					$base['path'] =  rtrim(dirname($_SERVER['PHP_SELF']), '/\\');
				} else {
					//Others
					$base['path'] =  rtrim(dirname($_SERVER['SCRIPT_NAME']), '/\\');
				}
			}
		}

		return $pathonly === false ? $base['prefix'].$base['path'].'/' : $base['path'];
	}

	/**
	 * Returns the root URI for the request.
	 *
	 * @access	public
	 * @static
	 * @param	boolean $pathonly If false, prepend the scheme, host and port information. Default is false.
	 * @return	string	The root URI string
	 * @since	1.5
	 */
	function root($pathonly = false, $path = null)
	{
		static $root;

		// Get the scheme
		if(!isset($root))
		{
			$uri	        =& JURI::getInstance();
			$root['prefix'] = $uri->toString( array('scheme', 'host', 'port'));
			$root['path']    = JURI::base(true);
		}

		// Get the scheme
		if(isset($path)) {
			$root['path']    = $path;
		}

		return $pathonly === false ? $root['prefix'].$root['path'].'/' : $root['path'];
	}

	/**
	 * Returns the URL for the request, minus the query
	 *
	 * @access	public
	 * @return	string
	 * @since	1.5
	 */
	function current()
	{
		static $current;

		// Get the current URL
		if (!isset($current))
		{
			$uri	 = & JURI::getInstance();
			$current = $uri->toString( array('scheme', 'host', 'port', 'path'));
		}

		return $current;
	}

	/**
	 * Parse a given URI and populate the class fields
	 *
	 * @access	public
	 * @param	string $uri The URI string to parse
	 * @return	boolean True on success
	 * @since	1.5
	 */
	function parse($uri)
	{
		//Initialize variables
		$retval = false;

		// Set the original URI to fall back on
		$this->_uri = $uri;

		/*
		 * Parse the URI and populate the object fields.  If URI is parsed properly,
		 * set method return value to true.
		 */
		if ($_parts = $this->_parseURL($uri)) {
			$retval = true;
		}

		//We need to replace &amp; with & for parse_str to work right...
		if(isset ($_parts['query']) && strpos($_parts['query'], '&amp;')) {
			$_parts['query'] = str_replace('&amp;', '&', $_parts['query']);
		}

		$this->_scheme = isset ($_parts['scheme']) ? $_parts['scheme'] : null;
		$this->_user = isset ($_parts['user']) ? $_parts['user'] : null;
		$this->_pass = isset ($_parts['pass']) ? $_parts['pass'] : null;
		$this->_host = isset ($_parts['host']) ? $_parts['host'] : null;
		$this->_port = isset ($_parts['port']) ? $_parts['port'] : null;
		$this->_path = isset ($_parts['path']) ? $_parts['path'] : null;
		$this->_query = isset ($_parts['query'])? $_parts['query'] : null;
		$this->_fragment = isset ($_parts['fragment']) ? $_parts['fragment'] : null;

		//parse the query

		if(isset ($_parts['query'])) parse_str($_parts['query'], $this->_vars);
		return $retval;
	}

	/**
	 * Returns full uri string
	 *
	 * @access	public
	 * @param	array $parts An array specifying the parts to render
	 * @return	string The rendered URI string
	 * @since	1.5
	 */
	function toString($parts = array('scheme', 'user', 'pass', 'host', 'port', 'path', 'query', 'fragment'))
	{
		$query = $this->getQuery(); //make sure the query is created

		$uri = '';
		$uri .= in_array('scheme', $parts)  ? (!empty($this->_scheme) ? $this->_scheme.'://' : '') : '';
		$uri .= in_array('user', $parts)	? $this->_user : '';
		$uri .= in_array('pass', $parts)	? (!empty ($this->_pass) ? ':' : '') .$this->_pass. (!empty ($this->_user) ? '@' : '') : '';
		$uri .= in_array('host', $parts)	? $this->_host : '';
		$uri .= in_array('port', $parts)	? (!empty ($this->_port) ? ':' : '').$this->_port : '';
		$uri .= in_array('path', $parts)	? $this->_path : '';
		$uri .= in_array('query', $parts)	? (!empty ($query) ? '?'.$query : '') : '';
		$uri .= in_array('fragment', $parts)? (!empty ($this->_fragment) ? '#'.$this->_fragment : '') : '';

		return $uri;
	}

	/**
	 * Adds a query variable and value, replacing the value if it
	 * already exists and returning the old value.
	 *
	 * @access	public
	 * @param	string $name Name of the query variable to set
	 * @param	string $value Value of the query variable
	 * @return	string Previous value for the query variable
	 * @since	1.5
	 */
	function setVar($name, $value)
	{
		$tmp = @$this->_vars[$name];
		$this->_vars[$name] = $value;

		//empty the query
		$this->_query = null;

		return $tmp;
	}

	/**
	 * Returns a query variable by name
	 *
	 * @access	public
	 * @param	string $name Name of the query variable to get