admin/cron.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  * Web cron
  20  *
  21  * This script looks through all the module directories for cron.php files
  22  * and runs them.  These files can contain cleanup functions, email functions
  23  * or anything that needs to be run on a regular basis.
  24  *
  25  * This file is best run from cron on the host system (ie outside PHP).
  26  * It is strongly recommended to add password protection via admin settings.
  27  *
  28  * eg   wget -q -O /dev/null 'http: *moodle.somewhere.edu/admin/cron.php?password=SeCreT666'
  29  *
  30  * It is also possible to use CLI script admin/cli/cron.php instead,
  31  * you can not call this script from command line any more.
  32  *
  33  * @package    core
  34  * @subpackage admin
  35  * @copyright  1999 onwards Martin Dougiamas  http://dougiamas.com
  36  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37  */
  38
  39 // This is a fake CLI script, it is a really ugly hack which emulates
  40 // CLI via web interface, please do not use this hack elsewhere
  41 define('CLI_SCRIPT', true);
  42 define('WEB_CRON_EMULATED_CLI', 'defined'); // ugly ugly hack, do not use elsewhere please
  43
  44 require('../config.php');
  45 require_once($CFG->libdir.'/clilib.php');
  46 require_once($CFG->libdir.'/cronlib.php');
  47
  48 // disable compression, it would prevent closing of buffers
  49 if (ini_get('zlib.output_compression')) {
  50     ini_set('zlib.output_compression', 'Off');
  51 }
  52 // no more headers and buffers
  53 ob_implicit_flush(true);
  54 while(ob_get_level()) {
  55     if (!ob_end_clean()) {
  56         // prevent infinite loop
  57         break;
  58     }
  59 }
  60
  61 // extra safety
  62 session_get_instance()->write_close();
  63
  64 // check if execution allowed
  65 if (!empty($CFG->cronclionly)) {
  66     // This script can only be run via the cli.
  67     print_error('cronerrorclionly', 'admin');
  68     exit;
  69 }
  70 // This script is being called via the web, so check the password if there is one.
  71 if (!empty($CFG->cronremotepassword)) {
  72     $pass = optional_param('password', '', PARAM_RAW);
  73     if ($pass != $CFG->cronremotepassword) {
  74         // wrong password.
  75         print_error('cronerrorpassword', 'admin');
  76         exit;
  77     }
  78 }
  79
  80 // send mime type and encoding
  81 if (check_browser_version('MSIE')) {
  82     //ugly IE hack to work around downloading instead of viewing
  83     @header('Content-Type: text/html; charset=utf-8');
  84     echo "<xmp>"; //<pre> is not good enough for us here
  85 } else {
  86     //send proper plaintext header
  87     @header('Content-Type: text/plain; charset=utf-8');
  88 }
  89
  90 // execute the cron
  91 cron_run();
  92
  93 // finish the IE hack
  94 if (check_browser_version('MSIE')) {
  95     echo "</xmp>";
  96 }
  97
  98