userfile.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * This script serves user's private files
  20  *
  21  * @package    moodlecore
  22  * @subpackage file
  23  * @copyright  2008 Petr Skoda (http://skodak.org)
  24  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25  */
  26
  27 // disable moodle specific debug messages and any errors in output
  28 define('NO_DEBUG_DISPLAY', true);
  29
  30 require_once('config.php');
  31 require_once('lib/filelib.php');
  32
  33
  34 $relativepath = get_file_argument();
  35 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  36
  37 // relative path must start with '/'
  38 if (!$relativepath) {
  39     print_error('invalidargorconf');
  40 } else if ($relativepath{0} != '/') {
  41     print_error('pathdoesnotstartslash');
  42 }
  43
  44 // extract relative path components
  45 $args = explode('/', ltrim($relativepath, '/'));
  46
  47 if (count($args) == 0) { // always at least user id
  48     print_error('invalidarguments');
  49 }
  50
  51 $contextid = (int)array_shift($args);
  52 $filearea = array_shift($args);
  53
  54 $context = get_context_instance_by_id($contextid);
  55 if ($context->contextlevel != CONTEXT_USER) {
  56     print_error('invalidarguments');
  57 }
  58
  59 $userid = $context->instanceid;
  60
  61 switch ($filearea) {
  62     case 'user_profile':
  63         require_login();
  64         if (isguestuser()) {
  65             print_error('noguest');
  66         }
  67
  68         // access controll here must match user edit forms
  69         if ($userid == $USER->id) {
  70              if (!has_capability('moodle/user:editownprofile', get_context_instance(CONTEXT_SYSTEM))) {
  71                 send_file_not_found();
  72              }
  73         } else {
  74             if (!has_capability('moodle/user:editprofile', $context) and !has_capability('moodle/user:update', $context)) {
  75                 send_file_not_found();
  76             }
  77         }
  78         $itemid = 0;
  79         $forcedownload = true;
  80         break;
  81
  82     case 'user_private':
  83         require_login();
  84         if (isguestuser()) {
  85             send_file_not_found();
  86         }
  87         if ($USER->id != $userid) {
  88             send_file_not_found();
  89         }
  90         $itemid = 0;
  91         $forcedownload = true;
  92         break;
  93     case 'user_backup':
  94         require_login();
  95         if (isguestuser()) {
  96             send_file_not_found();
  97         }
  98         if ($USER->id != $userid) {
  99             send_file_not_found();
 100         }
 101         $itemid = 0;
 102         $forcedownload = true;
 103         break;
 104
 105     default:
 106         send_file_not_found();
 107 }
 108
 109 $relativepath = '/'.implode('/', $args);
 110
 111 $fs = get_file_storage();
 112
 113 $fullpath = $context->id.$filearea.$itemid.$relativepath;
 114
 115 if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->get_filename() == '.') {
 116     send_file_not_found();
 117 }
 118
 119 // ========================================
 120 // finally send the file
 121 // ========================================
 122 session_get_instance()->write_close(); // unlock session during fileserving
 123 send_stored_file($file, 0, false, $forcedownload);