docs/include/classes/UrlRewrite/UrlParser.class.php

   1 <?php
   2 /************************************************************************/
   3 /* ATutor                                                                                                                               */
   4 /************************************************************************/
   5 /* Copyright (c) 2002-2010                                              */
   6 /* Inclusive Design Institute                                           */
   7 /* http://atutor.ca                                                     */
   8 /* This program is free software. You can redistribute it and/or        */
   9 /* modify it under the terms of the GNU General Public License          */
  10 /* as published by the Free Software Foundation.                        */
  11 /************************************************************************/
  12 // $Id$
  13
  14 require_once('UrlRewrite.class.php');
  15
  16 /**
  17 * UrlParser
  18 * Class for rewriting pretty urls.
  19 * @access       public
  20 * @author       Harris Wong
  21 * @package      UrlParser
  22 */
  23 class UrlParser {
  24         //Variables
  25         var $path_array;        //an array [0]->course_id; [1]->class obj
  26
  27         // Constructor
  28         function UrlParser($pathinfo=''){
  29                 if ($pathinfo==''){
  30                         $pathinfo = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
  31                 }
  32                 $this->parsePathInfo($pathinfo);
  33         }
  34
  35         /**
  36          * This function will take the pathinfo and return an array of elements
  37          * retrieved from the path info.
  38          * An ATutor pathinfo will always be in the format of /<course_slug>/<type>/<parts>
  39          * course_slug is the course_slug defined in course preference (or course id if it's empty)
  40          * type is the folder, particularlly forums, content, tests, blogs, mods, etc.
  41          * parts is the extra info about this url request.
  42          * @param       string  the pathinfo from the URL
  43          * @access      private
  44          */
  45         function parsePathinfo($pathinfo){
  46                 global $db;
  47                 $pathinfo = strtolower($pathinfo);
  48
  49                 //remove AT_PRETTY_URL_HANDLER from the path info.
  50                 if (($pos=strpos($pathinfo, AT_PRETTY_URL_HANDLER))!==FALSE){
  51                         $pathinfo = substr($pathinfo, $pos);
  52                 }
  53
  54                 /*
  55                  * matches[1] = course slug/id
  56                  * matches[2] = path
  57                  * matches[3] = useless, just a place holder
  58                  * matches[4] = filename
  59                  * matches[5] = query string in pretty format
  60                  * @http://ca3.php.net/preg_match
  61                  */
  62                 if (strpos($pathinfo, 'mods')!==FALSE){
  63                         //If this is a mod, its file name will be longer with mods/ infront
  64                         preg_match('/^\/[\w\-]+\/?$|(\/[\w]+)(\/mods(\/[\w]+)+)\/([\w\_\.]+\.php)([\/\w\W]*)/', $pathinfo, $matches);
  65                 } else {
  66                         preg_match('/^\/[\w\-]+\/?$|(\/[\w]+)(([\/\w]*))\/([\w\_\.]+\.php)([\/\w\W]*)/', $pathinfo, $matches);
  67                 }
  68
  69                 if (empty($matches)){
  70                         //no matches.
  71                         $matches[1] = 0;
  72                 } elseif (sizeof($matches)==1){
  73                         //if the url consist of just the course slug, the size would be just 2
  74                         $matches[1] = $matches[0];
  75                 }
  76
  77                 //take out the front slash
  78                 $matches[1] = preg_replace('/\//', '', $matches[1]);
  79                 $course_id = $matches[1];
  80
  81                 //check if this is a course slug or course id.
  82                 if (preg_match('/^[\d]+$/', $matches[1])==0){
  83                         //it's a course slug, log into the course.
  84                         $sql    = "SELECT course_id FROM ".TABLE_PREFIX."courses WHERE course_dir_name='$matches[1]'";
  85                         $result = mysql_query($sql, $db);
  86                         $row = mysql_fetch_assoc($result);
  87                         if ($row['course_id']!=''){
  88                                 $course_id = $row['course_id'];
  89                         } else {
  90                                 $course_id = 0;
  91                         }
  92                 }
  93
  94                 //Check if there are any matches for prettied query string, if not, use the actual query.
  95                 if (!isset($matches[5]) || $matches[5] == ''){
  96                         $matches[5] = $_SERVER['QUERY_STRING'];
  97                 }
  98
  99                 //Create object based on this path.
 100                 $matches[2] = isset($matches[2]) ? $matches[2] : '';
 101                 $matches[4] = isset($matches[4]) ? $matches[4] : '';
 102                 $url_obj = new UrlRewrite($matches[2], $matches[4], $matches[5]);
 103
 104                 $this->path_array = array($course_id, $url_obj);
 105         }
 106
 107
 108         /**
 109          * return the path array
 110          */
 111         function getPathArray(){
 112                 return $this->path_array;
 113         }
 114
 115
 116         /**
 117          * Returns course_id if config_[course_dir_name] is switched off,
 118          * otherwise, return the course dir name.
 119          * Called by vitals.inc.php
 120          *
 121          * @param       int             course id
 122          * @return      mixed   course id if config[course_dir_name] is 0, course_dir_name otherwise
 123          */
 124         function getCourseDirName($course_id){
 125                 global $db;
 126                 $course_id = intval($course_id);
 127
 128                 $sql    = "SELECT course_dir_name FROM ".TABLE_PREFIX."courses WHERE course_id=$course_id";
 129                 $result = mysql_query($sql, $db);
 130                 $row = mysql_fetch_assoc($result);
 131                 if ($row['course_dir_name']!=''){
 132                         $course_id = $row['course_dir_name'];
 133                 }
 134
 135                 return $course_id;
 136         }
 137 }
 138 ?>