<?php
/**
* @version $Id: sef.php,v 1.3 2005/11/23 22:49:07 csouza Exp $
* @package Mambo
* @copyright (C) 2000 - 2005 Miro International Pty Ltd
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
* Mambo is Free Software
*/

class mosSEF {
	
	var $custom_code = array();
	var $custom_name = array();
	var $custom_PHP = array();
	var $custom_short = array();
	var $sef_content_task = array();
	var $sef_name_chars = array();
	var $sef_translate_chars = array();
	var $content_data = null;
	var $content_items = array();
	var $content_sections = array();
	var $content_categories = array();
	var $SEF_SPACE;
	
	function mosSEF () {
		/*******************************************************************************
		**  The following are parameters for the ReMOSef Search Engine
		**  Optimisation component.  $this->SEF_SPACE should be set to the
		**  character that is to replace blanks in names that form the URL.
		**  You can vary this, although the only sensible choices seem to be
		**  underscore or hyphen (_ or -).
		**
		**  The arrays $this->custom_code and $this->custom_name must be kept exactly
		**  in step with each other.  $this->custom_code is a list of the components
		**  that are to be handled by ReMOSef.
		**
		**  The array $this->custom_name is the alternative name that will be used
		**  in the optimised URL to identify the component and can be whatever
		**  you please so long as it is unique and legal for a URL.  Apart from
		**  using the custom name for the component, ReMOSef will do no further
		**  translation of the URL than is done by the standard Mambo SEF - UNLESS
		**  there is a sef_ext.php file installed for that component.  The
		**  exception to this is ReMOSitory - the optimisation code for Remository
		**  is integrated in ReMOSef.  For other components, if a sef_ext.php is
		**  present, it will be invoked by ReMOSef.
		**

		**  The array $remosef_content_task is capable of translating the tasks
		**  understood by the Mambo content component.  Please DO NOT CHANGE what
		**  is to the left of the equals sign.  When putting different values on
		**  the right hand side, remember that they must all be different, and must
		**  also be different from any of the custom names used for components.
		**  Without that, Remosef cannot figure out what a SEF URL means and will
		**  give unpredictable results.
		*******************************************************************************/
		$this->SEF_SPACE = "_";					// divide words with underscores
											// can be changed to a hyphen "-"
		$this->custom_code = array('com_remository','com_simpleboard','com_frontpage','com_contact','com_mrecommend','com_graphitory');
		$this->custom_name = array('Remository','Forum','Frontpage','Contact_Us','Recommend_Us','Graphitory');
		/*******************************************************************************
		**  The following are the parameters for the optional content specific
		**  URL optimisation.
		**
		**  The following two lines define the translations that SEF will perform on
		**  names of sections and categories when translating them for inclusion in a URL.
		**  Each item in $this->sef_name_chars is translated into the corresponding
		**  element of $this->sef_translate_chars.
		**
		**  NOTE it is important that space be the last translate character, since the
		**  characters are processed in the order in which they appear.  Since earlier
		**  translates may create new spaces, it is vital that the space translation is
		**  done last.
		**
		**  You can extend these arrays as you wish, although it is obviously important
		**  to make sure that the items of one match the items of the other exactly.
		*******************************************************************************/
		$this->sef_name_chars = array('–', '?', '&', '/', ' ');
		$this->sef_translate_chars = array('-', '', 'and', ' or ', $this->SEF_SPACE);

/************** DO NOT MAKE CHANGES PAST HERE EXCEPT AT YOUR OWN RISK! ********************/

		foreach ($this->custom_code as $code) {
			$codefile = "components/$code/sef_ext.php";
			if (file_exists($codefile)) {
				include ($codefile);
				$this->custom_PHP[] = true;
			}
			else $this->custom_PHP[] = false;
			$split = explode('_',$code);
			$this->custom_short[] = $split[1];
		}

		$this->sef_content_task['findkey'] = 'findkey';
		$this->sef_content_task['view'] = 'view';
		$this->sef_content_task['section'] = 'section';
		$this->sef_content_task['category'] = 'category';
		$this->sef_content_task['blogsection'] = 'blogsection';
		$this->sef_content_task['blogcategorymulti'] = 'blogcategorymulti';
		$this->sef_content_task['blogcategory'] = 'blogcategory';
		$this->sef_content_task['archivesection'] = 'archivesection';
		$this->sef_content_task['archivecategory'] = 'archivecategory';
		$this->sef_content_task['save'] = 'save';
		$this->sef_content_task['cancel'] = 'cancel';
		$this->sef_content_task['emailform'] = 'emailform';
		$this->sef_content_task['emailsend'] = 'emailsend';
		$this->sef_content_task['vote'] = 'vote';
		$this->sef_content_task['showblogsection'] = 'showblogsection';

	}
	
	function &getInstance () {
		static $instance;
		if (!is_object($instance)) $instance = new mosSEF();
		return $instance;
	}

	function sefRetrieval($register_globals){
		
	    if (preg_match('/(\b)GLOBALS|_REQUEST|_SERVER|_ENV|_COOKIE|_GET|_POST|_FILES|_SESSION(\b)/i', $_SERVER['REQUEST_URI']) > 0) {
	        die('Invalid Request');
	    }
		if (mamboCore::get('mosConfig_sef')) {
			$url_array = explode('/', $_SERVER['REQUEST_URI']);
			/**
			* Content
			* /$option/$task/$sectionid/$id/$Itemid/$limit/$limitstart
			*/

			$foundit = false;
			if ($url_array[1] == 'content') {
				$foundit = true;
				$_REQUEST['option'] = $_GET['option'] = $option = 'com_content';

				// language hook for content
				$lang = "";
				$parms = array();
				foreach($url_array as $key=>$value) {
					if ( strcasecmp(substr($value,0,5),'lang,') == 0 ) {
						$parts = explode(",", $value);
						if (count($parts) > 1) {
							$lang = $_REQUEST['lang'] = $_GET['lang'] = $parts[1];
						}
					}
					elseif ( $value != '' AND $key > 1 ) $parms[] = $value;
				}

				// $option/$task/$sectionid/$id/$Itemid/$limit/$limitstart
				$task = array_search($parms[0], $this->sef_content_task);
				if ($task === false OR $task === null) return 1;
				$_REQUEST['task'] = $_GET['task'] = $task;
				$QUERY_STRING = "option=com_content&task=$task";
				$num = count($parms);
				for ($i = 1; $i <= $num-1; $i++) {
					if (strcmp($parms[$i], (int)$parms[$i]) !== 0) return 1;
				}
				$i = 1;
				if ($num == 6 OR $num == 4) {
					$_REQUEST['sectionid'] = $_GET['sectionid'] = $sectionid = $parms[$i];
					$QUERY_STRING .= "&sectionid=$sectionid";
					$i++;
				}
				if ($num > 1) {
					$_REQUEST['id'] = $_GET['id'] = $id = $parms[$i];
					$QUERY_STRING .= "&id=$id";
				}
				if ($num > 2) {
					$_REQUEST['Itemid'] = $_GET['Itemid'] = $Itemid = $parms[$i+1];
					mamboCore::set('Itemid',$Itemid);
					$QUERY_STRING .= "&Itemid=$Itemid";
				}
				if ($num > 4) {
					$_REQUEST['limit'] = $_GET['limit'] = $limit = $parms[$i+2];
					$_REQUEST['limitstart'] = $_GET['limitstart'] = $limitstart = $parms[$i+3];
					$QUERY_STRING .= "&limit=$limit&limitstart=$limitstart";
				}

				if ($lang!="") {
					$QUERY_STRING .= "&lang=$lang";
				}
			}

			/*
			Components
			http://www.domain.com/component/$name,$value
			*/
			elseif ($url_array[1] == 'component') {
				$foundit = true;
				$QUERY_STRING = $this->default_revert('component');
			}
			else {
				$menuhandler = mosMenuHandler::getInstance();
				foreach ($this->custom_name as $i=>$compname) {
					if ($url_array[1] == $compname) {
						$foundit = true;
						$origname = $this->custom_code[$i];
						$_REQUEST['Itemid'] = $_GET['Itemid'] = $Itemid = $menuhandler->getIDLikeLink("index.php?option=$origname");
						mamboCore::set('Itemid', $Itemid);
						if ($this->custom_PHP[$i]) {
							$fixup = '$QUERY_STRING = "option='.$origname.'&Itemid=".$Itemid.sef_'.$this->custom_short[$i].'::revert($url_array,0);';
							eval($fixup);
						}
						else $QUERY_STRING = "option=$origname&Itemid=$Itemid".$this->default_revert($compname);
						$_REQUEST['option'] = $this->custom_code[$i];
						break;
					}
				}
				if (!$foundit) {
					$content_sef = mamboCore::get('mosConfig_absolute_path').'/components/com_content/sef_ext.php';
					if (file_exists($content_sef)) {
						require_once($content_sef);
						$QUERY_STRING = sef_content::revert($url_array,0);
						if ($QUERY_STRING) $foundit = true;
					}
				}
			}

			if ($foundit) {
				$_SERVER['QUERY_STRING'] = $QUERY_STRING;
				$REQUEST_URI = '/index.php?'.$QUERY_STRING;
				$_SERVER['REQUEST_URI'] = $REQUEST_URI;
				return 0;
			}
			else return 1;
		}
	}
	
	function default_revert ($specialname) {
		$request = explode($specialname.'/', $_SERVER['REQUEST_URI']);
		if (isset($request[1])) $parmset = explode("/", $request[1]);
		else $parmset = array();
		$QUERY_STRING = '';
		$menuhandler = mosMenuHandler::getInstance();
		foreach($parmset as $values) {
			$parts = explode(",", $values);
			if (count($parts) > 1) {
				$_REQUEST[$parts[0]] = $_GET[$parts[0]] = $parts[1];
				if ($parts[0] == 'option') {
					$_REQUEST['Itemid'] = $_GET['Itemid'] = $Itemid = $menuhandler->getIDLikeLink("index.php?option=$parts[1]");
					mamboCore::set('Itemid', $Itemid);
					$QUERY_STRING .= "$parts[0]=$parts[1]&Itemid=$Itemid";
				}
				$QUERY_STRING .= "&$parts[0]=$parts[1]";
			}
		}
		return $QUERY_STRING;
	}

	function sefRelToAbs( $string ) {
		global $iso_client_lang;

		$server = mamboCore::get('mosConfig_live_site');
		if ($string == 'index.php') return $server;

		if (!mamboCore::get('mosConfig_sef') OR strtolower(substr($string,0,9)) != 'index.php' OR eregi('^(([^:/?#]+):)',$string)) return $string;

		$passed_string = str_replace('&amp;', '&', $string);
		$string = substr($passed_string,10);
		if(mamboCore::get('mosConfig_mbf_content') AND strpos("lang=", strtolower($string)) === false) {
			$string .= "&lang=$iso_client_lang";
		}
		$option = $task = '';
		$oktasks = true;
		parse_str($string, $params);
		foreach ($params as $key=>$value) {
			$lowkey = strtolower($key);
			$lowvalue = strtolower($value);
			$unset = true;
			switch ($lowkey) {
				case 'option':
				    $option = $lowvalue;
				    break;
				case 'task':
				    $task = $value;
					if ($lowvalue == 'new' OR $lowvalue == 'edit') $oktasks = false;
					break;
				default:
					$check_params[$lowkey] = $key;
					$unset = false;
			}
			if ($unset) unset($params[$key]);
		}
		// Process content items
		if (($option == 'com_content' OR $option == 'content') AND $oktasks) {
			/*
			Content
			index.php?option=com_content&task=$task&sectionid=$sectionid&id=$id&Itemid=$Itemid&limit=$limit&limitstart=$limitstart
			*/
			$task = $this->sef_content_task[$task];
			$content_sef = mamboCore::get('mosConfig_absolute_path').'/components/com_content/sef_ext.php';
			if (file_exists($content_sef)) {
				require_once($content_sef);
				return $server.sef_content::create($task, $params);
			}
			$keys = array('sectionid', 'id', 'itemid', 'limit', 'limitstart', 'lang');
			$string = "/content/$task/";
			foreach ($keys as $key) {
				if (isset($check_params[$key])) {
					$pkey = $check_params[$key];
					$string .= $params[$pkey].'/';
				}
			}
			return $server.$string;
		}
		// Other types of URL than content do not use Itemid in the SEO version
		if (isset($check_params['itemid'])) {
			$pkey = $check_params['itemid'];
			unset($params[$pkey]);
			unset($check_params['itemid']);
		}
		// Process customised components
		$i = array_search($option,$this->custom_code);
		if ($i !== false AND $i !== null) {
			if ($this->custom_PHP[$i]) eval('$string = sef_'.$this->custom_short[$i].'::create($passed_string);');
			else $string = $this->componentDetails($params,$task);
			return $server.'/'.$this->custom_name[$i].'/'.$string;
		}
		// Process ordinary components
		if (strpos($option,'com_')===0 AND $option != 'com_registration' AND $oktasks) {
			return "$server/component/option,$option/".$this->componentDetails($params,$task);
		}
		// Anything else is returned as received, except it is guaranteed that & will be &amp;
		return $server.'/'.str_replace( '&', '&amp;', $passed_string );
	}

	function componentDetails (&$params, $task) {
		$string = ($task ? "task,$task/" : '');
		foreach ($params as $key=>$param) $string .= "$key,$param/";
		return $string;
	}

}
?>