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.
  21  *
  22  * You should use the get_file_url() function, available in lib/filelib.php, to link to file.php.
  23  * This ensures proper formatting and offers useful options.
  24  * Syntax:      file.php/courseid/dir/dir/dir/filename.ext
  25  *              file.php/courseid/dir/dir/dir/filename.ext?forcedownload=1 (download instead of inline)
  26  *              file.php/courseid/dir (returns index.html from dir)
  27  * Workaround:  file.php?file=/courseid/dir/dir/dir/filename.ext
  28  *
  29  * @package    moodlecore
  30  * @subpackage file
  31  * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
  32  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33  */
  34
  35 // disable moodle specific debug messages and any errors in output
  36 define('NO_DEBUG_DISPLAY', true);
  37
  38 require_once('config.php');
  39 require_once('lib/filelib.php');
  40
  41 if (!isset($CFG->filelifetime)) {
  42     $lifetime = 86400;     // Seconds for files to remain in caches
  43 } else {
  44     $lifetime = $CFG->filelifetime;
  45 }
  46
  47 $relativepath  = get_file_argument();
  48 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  49
  50 // relative path must start with '/', because of backup/restore!!!
  51 if (!$relativepath) {
  52     print_error('invalidargorconf');
  53 } else if ($relativepath{0} != '/') {
  54     print_error('pathdoesnotstartslash');
  55 }
  56
  57 // extract relative path components
  58 $args = explode('/', ltrim($relativepath, '/'));
  59
  60 if (count($args) == 0) { // always at least courseid, may search for index.html in course root
  61     print_error('invalidarguments');
  62 }
  63
  64 $courseid = (int)array_shift($args);
  65 $relativepath = '/'.implode('/', $args);
  66
  67 // security: limit access to existing course subdirectories
  68 $course = $DB->get_record('course', array('id'=>$courseid), '*', MUST_EXIST);
  69
  70 if ($course->legacyfiles != 2) {
  71     // course files disabled
  72     send_file_not_found();
  73 }
  74
  75 if ($course->id != SITEID) {
  76     require_login($course->id, true, null, false);
  77
  78 } else if ($CFG->forcelogin) {
  79     if (!empty($CFG->sitepolicy)
  80         and ($CFG->sitepolicy == $CFG->wwwroot.'/file.php'.$relativepath
  81              or $CFG->sitepolicy == $CFG->wwwroot.'/file.php?file='.$relativepath)) {
  82         //do not require login for policy file
  83     } else {
  84         require_login(0, true, null, false);
  85     }
  86 }
  87
  88 $context = get_context_instance(CONTEXT_COURSE, $course->id);
  89
  90 $fs = get_file_storage();
  91
  92 $fullpath = $context->id.'course_content0'.$relativepath;
  93
  94 if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
  95     if (strrpos($fullpath, '/') !== strlen($fullpath) -1 ) {
  96         $fullpath .= '/';
  97     }
  98     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'/.'))) {
  99         send_file_not_found();
 100     }
 101 }
 102 // do not serve dirs
 103 if ($file->get_filename() == '.') {
 104     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.html'))) {
 105         if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.htm'))) {
 106             if (!$file = $fs->get_file_by_hash(sha1($fullpath.'Default.htm'))) {
 107                 send_file_not_found();
 108             }
 109         }
 110     }
 111 }
 112
 113 // ========================================
 114 // finally send the file
 115 // ========================================
 116 session_get_instance()->write_close(); // unlock session during fileserving
 117 send_stored_file($file, $lifetime, $CFG->filteruploadedfiles, $forcedownload);
 118
 119