docs/mods/_standard/photos/include/lib.inc.php

   1 <?php
   2 /***********************************************************************/
   3 /* ATutor                                                                                                                          */
   4 /***********************************************************************/
   5 /* Copyright (c) 2002-2010                                             */
   6 /* Inclusive Design Institute                                          */
   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 /**
  16  * Generate album path padding by using album_id + album_created_date
  17  */
  18 function getPhotoFilePath($id, $filename, $timestamp){
  19         $padding = hash('sha1', $id.$timestamp);
  20         $path_parts = pathinfo($filename);
  21         //return the hash if filename is empty.
  22         //this is used for validation purposes.
  23         if($filename==''){
  24                 return $padding;
  25         }
  26
  27         $extension  = strtolower($path_parts['extension']);
  28         //Note: the padding might not be unique, but the path is ALWAYS unique
  29         //              because the id is unique.
  30         return ($id.'_'.substr($padding, -5).'.'.$extension);
  31 }
  32
  33 /**
  34  * Generate album path padding by using album_id + album_created_date
  35  */
  36 function getAlbumFilePath($id, $timestamp){
  37         $padding = hash('sha1', $id.$timestamp);
  38         //Note: the padding might not be unique, but the path is ALWAYS unique
  39         //              because the id is unique.
  40         return ($id.'_'.substr($padding, -5));
  41 }
  42
  43 /**
  44  * Check if the photo is supported, including extension check, file size check
  45  * and library support checks.
  46  * @param       string  location of the file.
  47  * @return      $_FILE[] on successful, null on failure.
  48  */
  49 function checkPhoto($file){
  50         global $stripslashes;
  51         global $msg, $_config;
  52         $msg = new AjaxMessage();
  53
  54         // check if GD is installed
  55         if (!extension_loaded('gd')) {
  56                 $msg->printInfos('FEATURE_NOT_AVAILABLE');
  57                 return false;
  58         }
  59
  60         // check if folder exists, if not, create it
  61         if (!is_dir(AT_PA_CONTENT_DIR)) {
  62                 mkdir(AT_PA_CONTENT_DIR);
  63         }
  64
  65         //check GD support
  66         $gd_info = gd_info();
  67
  68         $supported_images = array();
  69         if ($gd_info['GIF Create Support']) {
  70                 $supported_images[] = 'gif';
  71         }
  72         if ($gd_info['JPG Support'] || $gd_info['JPEG Support']) {
  73                 $supported_images[] = 'jpg';
  74         }
  75         if ($gd_info['PNG Support']) {
  76                 $supported_images[] = 'png';
  77         }
  78         if (!$supported_images) {
  79                 $msg->printInfos('FEATURE_NOT_AVAILABLE');
  80                 return false;
  81         }
  82
  83         // check if this is a supported file type
  84         $filename   = $stripslashes($file['name']);
  85         $path_parts = pathinfo($filename);
  86         $extension  = strtolower($path_parts['extension']);
  87         $image_attributes = getimagesize($file['tmp_name']);
  88
  89         //check Extension
  90         if ($extension == 'jpeg') {
  91                 $extension = 'jpg';
  92         }
  93         if (!in_array($extension, $supported_images)) {
  94                 $msg->addError(array('FILE_ILLEGAL', $extension));
  95                 return false;
  96         } else if ($image_attributes[2] > IMAGETYPE_PNG) {
  97                 $msg->addError(array('FILE_ILLEGAL', $extension));
  98                 return false;
  99         }
 100
 101         // make sure under max file size
 102         $allowed_usage = $_config['pa_max_memory_per_member'] * 1024 *1024;     //mb
 103         if (memoryUsage($_SESSION['member_id']) > $allowed_usage){
 104                 $msg->addError('PA_EXCEEDED_MAX_USAGE');
 105                 return false;
 106         }
 107
 108         //check filename
 109         $file['name'] = str_replace(array('\'', '"', ' ', '|', '\\', '/', '<', '>', ':'), '_' , $file['name'] );
 110         $file['name'] = preg_replace("/[^A-Za-z0-9._\-]/", '', $file['name'] );
 111         return $file;
 112 }
 113
 114
 115 /**
 116  * Return the total personal data usage (in bytes)
 117  */
 118 function memoryUsage($member_id){
 119         global $db;
 120         $member_id = intval($member_id);
 121         if ($member_id < 1){
 122                 return false;
 123         }
 124
 125         $memory_usage = 0;
 126         $sql = 'SELECT p.* FROM '.TABLE_PREFIX.'pa_photos p LEFT JOIN '.TABLE_PREFIX."pa_course_album ca ON p.album_id=ca.album_id WHERE member_id=$member_id AND ca.course_id IS NULL";
 127         $result = mysql_query($sql, $db);
 128         if ($result){
 129                 while ($row=mysql_fetch_assoc($result)){
 130                         $pa = new PhotoAlbum($row['album_id']);
 131                         $album_info = $pa->getAlbumInfo();
 132                         $photo_info = $pa->getPhotoInfo($row['id']);
 133                         $album_file_path = getAlbumFilePath($album_info['id'], $album_info['created_date']);
 134                         $photo_file_path = getPhotoFilePath($photo_info['id'], $photo_info['name'], $photo_info['created_date']);
 135                         $file = AT_PA_CONTENT_DIR . $album_file_path . DIRECTORY_SEPARATOR . $photo_file_path;
 136                         if (file_exists($file)){
 137                                 $memory_usage += filesize($file);
 138                         }
 139                 }
 140         }
 141         return $memory_usage;
 142 }
 143 ?>