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 if (!isset($CFG->filelifetime)) {
  40     $lifetime = 86400;     // Seconds for files to remain in caches
  41 } else {
  42     $lifetime = $CFG->filelifetime;
  43 }
  44
  45 $relativepath  = get_file_argument();
  46 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  47
  48 // relative path must start with '/', because of backup/restore!!!
  49 if (!$relativepath) {
  50     print_error('invalidargorconf');
  51 } else if ($relativepath{0} != '/') {
  52     print_error('pathdoesnotstartslash');
  53 }
  54
  55 // extract relative path components
  56 $args = explode('/', ltrim($relativepath, '/'));
  57
  58 if (count($args) == 0) { // always at least courseid, may search for index.html in course root
  59     print_error('invalidarguments');
  60 }
  61
  62 $courseid = (int)array_shift($args);
  63 $relativepath = implode('/', $args);
  64
  65 // security: limit access to existing course subdirectories
  66 $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
  67
  68 if ($course->legacyfiles != 2) {
  69     // course files disabled
  70     send_file_not_found();
  71 }
  72
  73 if ($course->id != SITEID) {
  74     require_login($course->id, true, null, false);
  75
  76 } else if ($CFG->forcelogin) {
  77     if (!empty($CFG->sitepolicy)
  78         and ($CFG->sitepolicy == $CFG->wwwroot.'/file.php/'.$relativepath
  79              or $CFG->sitepolicy == $CFG->wwwroot.'/file.php?file=/'.$relativepath)) {
  80         //do not require login for policy file
  81     } else {
  82         require_login(0, true, null, false);
  83     }
  84 }
  85
  86 $context = get_context_instance(CONTEXT_COURSE, $course->id);
  87
  88 $fs = get_file_storage();
  89
  90 $fullpath = "/$context->id/course/legacy/0/$relativepath";
  91
  92 if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
  93     if (strrpos($fullpath, '/') !== strlen($fullpath) -1 ) {
  94         $fullpath .= '/';
  95     }
  96     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'/.'))) {
  97         send_file_not_found();
  98     }
  99 }
 100 // do not serve dirs
 101 if ($file->get_filename() == '.') {
 102     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.html'))) {
 103         if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.htm'))) {
 104             if (!$file = $fs->get_file_by_hash(sha1($fullpath.'Default.htm'))) {
 105                 send_file_not_found();
 106             }
 107         }
 108     }
 109 }
 110
 111 // ========================================
 112 // finally send the file
 113 // ========================================
 114 session_get_instance()->write_close(); // unlock session during fileserving
 115 send_stored_file($file, $lifetime, $CFG->filteruploadedfiles, $forcedownload);
 116
 117