includes/specials/SpecialRunJobs.php

   1 <?php
   2 /**
   3  * Implements Special:RunJobs
   4  *
   5  * This program 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 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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 along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @author Aaron Schulz
  23  */
  24
  25 /**
  26  * Special page designed for running background tasks (internal use only)
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialRunJobs extends UnlistedSpecialPage {
  31         public function __construct() {
  32                 parent::__construct( 'RunJobs' );
  33         }
  34
  35         public function execute( $par = '' ) {
  36                 $this->getOutput()->disable();
  37
  38                 if ( wfReadOnly() ) {
  39                         header( "HTTP/1.0 423 Locked" );
  40                         print 'Wiki is in read-only mode';
  41
  42                         return;
  43                 } elseif ( !$this->getRequest()->wasPosted() ) {
  44                         header( "HTTP/1.0 400 Bad Request" );
  45                         print 'Request must be POSTed';
  46
  47                         return;
  48                 }
  49
  50                 $optional = array( 'maxjobs' => 0, 'maxtime' => 30, 'type' => false, 'async' => true );
  51                 $required = array_flip( array( 'title', 'tasks', 'signature', 'sigexpiry' ) );
  52
  53                 $params = array_intersect_key( $this->getRequest()->getValues(), $required + $optional );
  54                 $missing = array_diff_key( $required, $params );
  55                 if ( count( $missing ) ) {
  56                         header( "HTTP/1.0 400 Bad Request" );
  57                         print 'Missing parameters: ' . implode( ', ', array_keys( $missing ) );
  58
  59                         return;
  60                 }
  61
  62                 $squery = $params;
  63                 unset( $squery['signature'] );
  64                 $cSig = self::getQuerySignature( $squery ); // correct signature
  65                 $rSig = $params['signature']; // provided signature
  66
  67                 $verified = is_string( $rSig ) && hash_equals( $cSig, $rSig );
  68                 if ( !$verified || $params['sigexpiry'] < time() ) {
  69                         header( "HTTP/1.0 400 Bad Request" );
  70                         print 'Invalid or stale signature provided';
  71
  72                         return;
  73                 }
  74
  75                 // Apply any default parameter values
  76                 $params += $optional;
  77
  78                 if ( $params['async'] ) {
  79                         // Client will usually disconnect before checking the response,
  80                         // but it needs to know when it is safe to disconnect. Until this
  81                         // reaches ignore_user_abort(), it is not safe as the jobs won't run.
  82                         ignore_user_abort( true ); // jobs may take a bit of time
  83                         header( "HTTP/1.0 202 Accepted" );
  84                         ob_flush();
  85                         flush();
  86                         // Once the client receives this response, it can disconnect
  87                 }
  88
  89                 // Do all of the specified tasks...
  90                 if ( in_array( 'jobs', explode( '|', $params['tasks'] ) ) ) {
  91                         $runner = new JobRunner();
  92                         $response = $runner->run( array(
  93                                 'type'     => $params['type'],
  94                                 'maxJobs'  => $params['maxjobs'] ? $params['maxjobs'] : 1,
  95                                 'maxTime'  => $params['maxtime'] ? $params['maxjobs'] : 30
  96                         ) );
  97                         if ( !$params['async'] ) {
  98                                 print FormatJson::encode( $response, true );
  99                         }
 100                 }
 101         }
 102
 103         /**
 104          * @param array $query
 105          * @return string
 106          */
 107         public static function getQuerySignature( array $query ) {
 108                 global $wgSecretKey;
 109
 110                 ksort( $query ); // stable order
 111                 return hash_hmac( 'sha1', wfArrayToCgi( $query ), $wgSecretKey );
 112         }
 113 }