file.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 fetches legacy course files in dataroot directory, it is enabled
  20  * only if course->legacyfiles == 2. DO not link to this file in new code.
  21  *
  22  * Syntax:      file.php/courseid/dir/dir/dir/filename.ext
  23  *              file.php/courseid/dir/dir/dir/filename.ext?forcedownload=1 (download instead of inline)
  24  *              file.php/courseid/dir (returns index.html from dir)
  25  * Workaround:  file.php?file=/courseid/dir/dir/dir/filename.ext
  26  *
  27  * @package    core
  28  * @subpackage file
  29  * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
  30  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  31  */
  32
  33 // disable moodle specific debug messages and any errors in output
  34 define('NO_DEBUG_DISPLAY', true);
  35
  36 require_once('config.php');
  37 require_once('lib/filelib.php');
  38
  39 $relativepath  = get_file_argument();
  40 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  41
  42 // relative path must start with '/', because of backup/restore!!!
  43 if (!$relativepath) {
  44     print_error('invalidargorconf');
  45 } else if ($relativepath{0} != '/') {
  46     print_error('pathdoesnotstartslash');
  47 }
  48
  49 // extract relative path components
  50 $args = explode('/', ltrim($relativepath, '/'));
  51
  52 if (count($args) == 0) { // always at least courseid, may search for index.html in course root
  53     print_error('invalidarguments');
  54 }
  55
  56 $courseid = (int)array_shift($args);
  57 $relativepath = implode('/', $args);
  58
  59 // security: limit access to existing course subdirectories
  60 $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
  61
  62 if ($course->legacyfiles != 2) {
  63     // course files disabled
  64     send_file_not_found();
  65 }
  66
  67 if ($course->id != SITEID) {
  68     require_login($course, true, null, false);
  69
  70 } else if ($CFG->forcelogin) {
  71     if (empty($CFG->sitepolicyhandler) and !empty($CFG->sitepolicy)
  72         and ($CFG->sitepolicy == $CFG->wwwroot.'/file.php/'.$relativepath
  73              or $CFG->sitepolicy == $CFG->wwwroot.'/file.php?file=/'.$relativepath)) {
  74         //do not require login for policy file
  75     } else {
  76         require_login(0, true, null, false);
  77     }
  78 }
  79
  80 $context = context_course::instance($course->id);
  81
  82 $fs = get_file_storage();
  83
  84 $fullpath = "/$context->id/course/legacy/0/$relativepath";
  85
  86 if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
  87     if (strrpos($fullpath, '/') !== strlen($fullpath) -1 ) {
  88         $fullpath .= '/';
  89     }
  90     // Try to fallback to the directory named as the supposed file.
  91     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'.'))) {
  92         send_file_not_found();
  93     }
  94 }
  95 // do not serve dirs
  96 if ($file->get_filename() == '.') {
  97     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.html'))) {
  98         if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.htm'))) {
  99             if (!$file = $fs->get_file_by_hash(sha1($fullpath.'Default.htm'))) {
 100                 send_file_not_found();
 101             }
 102         }
 103     }
 104 }
 105
 106 // ========================================
 107 // finally send the file
 108 // ========================================
 109 \core\session\manager::write_close(); // Unlock session during file serving.
 110 send_stored_file($file, null, $CFG->filteruploadedfiles, $forcedownload);
 111
 112