draftfile.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 draft files of current user
  20  *
  21  * @package    core
  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 require_login();
  34 if (isguestuser()) {
  35     print_error('noguest');
  36 }
  37
  38 $relativepath = get_file_argument();
  39
  40 // relative path must start with '/'
  41 if (!$relativepath) {
  42     print_error('invalidargorconf');
  43 } else if ($relativepath{0} != '/') {
  44     print_error('pathdoesnotstartslash');
  45 }
  46
  47 // extract relative path components
  48 $args = explode('/', ltrim($relativepath, '/'));
  49
  50 if (count($args) == 0) { // always at least user id
  51     print_error('invalidarguments');
  52 }
  53
  54 $contextid = (int)array_shift($args);
  55 $component = array_shift($args);
  56 $filearea  = array_shift($args);
  57 $draftid   = (int)array_shift($args);
  58
  59 if ($component !== 'user' or $filearea !== 'draft') {
  60     send_file_not_found();
  61 }
  62
  63 $context = get_context_instance_by_id($contextid);
  64 if ($context->contextlevel != CONTEXT_USER) {
  65     send_file_not_found();
  66 }
  67
  68 $userid = $context->instanceid;
  69 if ($USER->id != $userid) {
  70     print_error('invaliduserid');
  71 }
  72
  73
  74 $fs = get_file_storage();
  75
  76 $relativepath = implode('/', $args);
  77 $fullpath = "/$context->id/user/draft/$draftid/$relativepath";
  78
  79 if (!$file = $fs->get_file_by_hash(sha1($fullpath)) or $file->get_filename() == '.') {
  80     send_file_not_found();
  81 }
  82
  83 // ========================================
  84 // finally send the file
  85 // ========================================
  86 session_get_instance()->write_close(); // unlock session during fileserving
  87 send_stored_file($file, 0, false, true); // force download - security first!