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 files from the course files in dataroot directory
  20  *
  21  * You should use the get_file_url() function, available in lib/filelib.php, to link to file.php.
  22  * This ensures proper formatting and offers useful options.
  23  * Syntax:      file.php/courseid/dir/dir/dir/filename.ext
  24  *              file.php/courseid/dir/dir/dir/filename.ext?forcedownload=1 (download instead of inline)
  25  *              file.php/courseid/dir (returns index.html from dir)
  26  * Workaround:  file.php?file=/courseid/dir/dir/dir/filename.ext
  27  *
  28  * @package    moodlecore
  29  * @subpackage file
  30  * @copyright  1999 onwards Martin Dougiamas (http://dougiamas.com)
  31  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  32  */
  33
  34 // disable moodle specific debug messages and any errors in output
  35 define('NO_DEBUG_DISPLAY', true);
  36
  37 require_once('config.php');
  38 require_once('lib/filelib.php');
  39
  40 if (!isset($CFG->filelifetime)) {
  41     $lifetime = 86400;     // Seconds for files to remain in caches
  42 } else {
  43     $lifetime = $CFG->filelifetime;
  44 }
  45
  46 $relativepath  = get_file_argument();
  47 $forcedownload = optional_param('forcedownload', 0, PARAM_BOOL);
  48
  49 // relative path must start with '/', because of backup/restore!!!
  50 if (!$relativepath) {
  51     print_error('invalidargorconf');
  52 } else if ($relativepath{0} != '/') {
  53     print_error('pathdoesnotstartslash');
  54 }
  55
  56 // extract relative path components
  57 $args = explode('/', ltrim($relativepath, '/'));
  58
  59 if (count($args) == 0) { // always at least courseid, may search for index.html in course root
  60     print_error('invalidarguments');
  61 }
  62
  63 $courseid = (int)array_shift($args);
  64 $relativepath = '/'.implode('/', $args);
  65
  66 // security: limit access to existing course subdirectories
  67 if (!$course = $DB->get_record('course', array('id'=>$courseid))) {
  68     print_error('invalidcourseid');
  69 }
  70
  71 if ($course->id != SITEID) {
  72     require_login($course->id, true, null, false);
  73
  74 } else if ($CFG->forcelogin) {
  75     if (!empty($CFG->sitepolicy)
  76         and ($CFG->sitepolicy == $CFG->wwwroot.'/file.php'.$relativepath
  77              or $CFG->sitepolicy == $CFG->wwwroot.'/file.php?file='.$relativepath)) {
  78         //do not require login for policy file
  79     } else {
  80         require_login(0, true, null, false);
  81     }
  82 }
  83
  84 $context = get_context_instance(CONTEXT_COURSE, $course->id);
  85
  86 $fs = get_file_storage();
  87
  88 $fullpath = $context->id.'course_content0'.$relativepath;
  89
  90 if (!$file = $fs->get_file_by_hash(sha1($fullpath))) {
  91     if (strrpos($fullpath, '/') !== strlen($fullpath) -1 ) {
  92         $fullpath .= '/';
  93     }
  94     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'/.'))) {
  95         send_file_not_found();
  96     }
  97 }
  98 // do not serve dirs
  99 if ($file->get_filename() == '.') {
 100     if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.html'))) {
 101         if (!$file = $fs->get_file_by_hash(sha1($fullpath.'index.htm'))) {
 102             if (!$file = $fs->get_file_by_hash(sha1($fullpath.'Default.htm'))) {
 103                 send_file_not_found();
 104             }
 105         }
 106     }
 107 }
 108
 109 // ========================================
 110 // finally send the file
 111 // ========================================
 112 session_get_instance()->write_close(); // unlock session during fileserving
 113 send_stored_file($file, $lifetime, $CFG->filteruploadedfiles, $forcedownload);
 114
 115