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