include/classes/UrlRewrite/UrlParser.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2008 by Greg Gay, Joel Kronenberg & Heidi Hazelton*/
   6 /* Adaptive Technology Resource Centre / University of Toronto                  */
   7 /* http://atutor.ca                                                                                                             */
   8 /*                                                                                                                                              */
   9 /* This program is free software. You can redistribute it and/or                */
  10 /* modify it under the terms of the GNU General Public License                  */
  11 /* as published by the Free Software Foundation.                                                */
  12 /************************************************************************/
  13 // $Id$
  14
  15 require_once('UrlRewrite.class.php');
  16
  17 /**
  18 * UrlParser
  19 * Class for rewriting pretty urls.
  20 * @access       public
  21 * @author       Harris Wong
  22 * @package      UrlParser
  23 */
  24 class UrlParser {
  25         //Variables
  26         var $path_array;        //an array [0]->course_id; [1]->class obj
  27
  28         // Constructor
  29         function UrlParser($pathinfo=''){
  30                 if ($pathinfo==''){
  31                         $pathinfo = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
  32                 }
  33                 $this->parsePathInfo($pathinfo);
  34         }
  35
  36         /**
  37          * This function will take the pathinfo and return an array of elements
  38          * retrieved from the path info.
  39          * An ATutor pathinfo will always be in the format of /<course_slug>/<type>/<parts>
  40          * course_slug is the course_slug defined in course preference (or course id if it's empty)
  41          * type is the folder, particularlly forums, content, tests, blogs, mods, etc.
  42          * parts is the extra info about this url request.
  43          * @param       string  the pathinfo from the URL
  44          * @access      private
  45          */
  46         function parsePathinfo($pathinfo){
  47                 global $db;
  48                 $pathinfo = strtolower($pathinfo);
  49
  50                 //remove AT_PRETTY_URL_HANDLER from the path info.
  51                 if (($pos=strpos($pathinfo, AT_PRETTY_URL_HANDLER))!==FALSE){
  52                         $pathinfo = substr($pathinfo, $pos);
  53                 }
  54
  55                 /*
  56                  * matches[1] = course slug/id
  57                  * matches[2] = path
  58                  * matches[3] = useless, just a place holder
  59                  * matches[4] = filename
  60                  * matches[5] = query string in pretty format
  61                  * @http://ca3.php.net/preg_match
  62                  */
  63                 if (strpos($pathinfo, 'mods')!==FALSE){
  64                         //If this is a mod, its file name will be longer with mods/ infront
  65                         preg_match('/^\/[\w\-]+\/?$|(\/[\w]+)(\/mods(\/[\w]+)+)\/([\w\_\.]+\.php)([\/\w\W]*)/', $pathinfo, $matches);
  66                 } else {
  67                         preg_match('/^\/[\w\-]+\/?$|(\/[\w]+)(([\/\w]*))\/([\w\_\.]+\.php)([\/\w\W]*)/', $pathinfo, $matches);
  68                 }
  69
  70                 if (empty($matches)){
  71                         //no matches.
  72                         $matches[1] = 0;
  73                 } elseif (sizeof($matches)==1){
  74                         //if the url consist of just the course slug, the size would be just 2
  75                         $matches[1] = $matches[0];
  76                 }
  77
  78                 //take out the front slash
  79                 $matches[1] = preg_replace('/\//', '', $matches[1]);
  80                 $course_id = $matches[1];
  81
  82                 //check if this is a course slug or course id.
  83                 if (preg_match('/^[\d]+$/', $matches[1])==0){
  84                         //it's a course slug, log into the course.
  85                         $sql    = "SELECT course_id FROM ".TABLE_PREFIX."courses WHERE course_dir_name='$matches[1]'";
  86                         $result = mysql_query($sql, $db);
  87                         $row = mysql_fetch_assoc($result);
  88                         if ($row['course_id']!=''){
  89                                 $course_id = $row['course_id'];
  90                         } else {
  91                                 $course_id = 0;
  92                         }
  93                 }
  94
  95                 //Check if there are any matches for prettied query string, if not, use the actual query.
  96                 if (!isset($matches[5]) || $matches[5] == ''){
  97                         $matches[5] = $_SERVER['QUERY_STRING'];
  98                 }
  99
 100                 //Create object based on this path.
 101                 $matches[2] = isset($matches[2]) ? $matches[2] : '';
 102                 $matches[4] = isset($matches[4]) ? $matches[4] : '';
 103                 $url_obj = new UrlRewrite($matches[2], $matches[4], $matches[5]);
 104
 105                 $this->path_array = array($course_id, $url_obj);
 106         }
 107
 108
 109         /**
 110          * return the path array
 111          */
 112         function getPathArray(){
 113                 return $this->path_array;
 114         }
 115
 116
 117         /**
 118          * Returns course_id if config_[course_dir_name] is switched off,
 119          * otherwise, return the course dir name.
 120          * Called by vitals.inc.php
 121          *
 122          * @param       int             course id
 123          * @return      mixed   course id if config[course_dir_name] is 0, course_dir_name otherwise
 124          */
 125         function getCourseDirName($course_id){
 126                 global $db;
 127                 $course_id = intval($course_id);
 128
 129                 $sql    = "SELECT course_dir_name FROM ".TABLE_PREFIX."courses WHERE course_id=$course_id";
 130                 $result = mysql_query($sql, $db);
 131                 $row = mysql_fetch_assoc($result);
 132                 if ($row['course_dir_name']!=''){
 133                         $course_id = $row['course_dir_name'];
 134                 }
 135
 136                 return $course_id;
 137         }
 138 }
 139 ?>