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 );
  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                 // Constant-time signature verification
  68                 // http://www.emerose.com/timing-attacks-explained
  69                 // @todo Make a common method for this
  70                 if ( !is_string( $rSig ) || strlen( $rSig ) !== strlen( $cSig ) ) {
  71                         $verified = false;
  72                 } else {
  73                         $result = 0;
  74                         $cSigLength = strlen( $cSig );
  75                         for ( $i = 0; $i < $cSigLength; $i++ ) {
  76                                 $result |= ord( $cSig[$i] ) ^ ord( $rSig[$i] );
  77                         }
  78                         $verified = ( $result == 0 );
  79                 }
  80                 if ( !$verified || $params['sigexpiry'] < time() ) {
  81                         header( "HTTP/1.0 400 Bad Request" );
  82                         print 'Invalid or stale signature provided';
  83
  84                         return;
  85                 }
  86
  87                 // Apply any default parameter values
  88                 $params += $optional;
  89
  90                 // Client will usually disconnect before checking the response,
  91                 // but it needs to know when it is safe to disconnect. Until this
  92                 // reaches ignore_user_abort(), it is not safe as the jobs won't run.
  93                 ignore_user_abort( true ); // jobs may take a bit of time
  94                 header( "HTTP/1.0 202 Accepted" );
  95                 ob_flush();
  96                 flush();
  97                 // Once the client receives this response, it can disconnect
  98
  99                 // Do all of the specified tasks...
 100                 if ( in_array( 'jobs', explode( '|', $params['tasks'] ) ) ) {
 101                         self::executeJobs( (int)$params['maxjobs'] );
 102                 }
 103         }
 104
 105         /**
 106          * @param array $query
 107          * @return string
 108          */
 109         public static function getQuerySignature( array $query ) {
 110                 global $wgSecretKey;
 111
 112                 ksort( $query ); // stable order
 113                 return hash_hmac( 'sha1', wfArrayToCgi( $query ), $wgSecretKey );
 114         }
 115
 116         /**
 117          * Run jobs from the job queue
 118          *
 119          * @note: also called from Wiki.php
 120          *
 121          * @param int $maxJobs Maximum number of jobs to run
 122          * @return void
 123          */
 124         public static function executeJobs( $maxJobs ) {
 125                 $n = $maxJobs; // number of jobs to run
 126                 if ( $n < 1 ) {
 127                         return;
 128                 }
 129                 try {
 130                         $group = JobQueueGroup::singleton();
 131                         $count = $group->executeReadyPeriodicTasks();
 132                         if ( $count > 0 ) {
 133                                 wfDebugLog( 'jobqueue', "Executed $count periodic queue task(s)." );
 134                         }
 135
 136                         do {
 137                                 $job = $group->pop( JobQueueGroup::TYPE_DEFAULT, JobQueueGroup::USE_CACHE );
 138                                 if ( $job ) {
 139                                         $output = $job->toString() . "\n";
 140                                         $t = -microtime( true );
 141                                         wfProfileIn( __METHOD__ . '-' . get_class( $job ) );
 142                                         $success = $job->run();
 143                                         wfProfileOut( __METHOD__ . '-' . get_class( $job ) );
 144                                         $group->ack( $job ); // done
 145                                         $t += microtime( true );
 146                                         $t = round( $t * 1000 );
 147                                         if ( $success === false ) {
 148                                                 $output .= "Error: " . $job->getLastError() . ", Time: $t ms\n";
 149                                         } else {
 150                                                 $output .= "Success, Time: $t ms\n";
 151                                         }
 152                                         wfDebugLog( 'jobqueue', $output );
 153                                 }
 154                         } while ( --$n && $job );
 155                 } catch ( MWException $e ) {
 156                         MWExceptionHandler::rollbackMasterChangesAndLog( $e );
 157                         // We don't want exceptions thrown during job execution to
 158                         // be reported to the user since the output is already sent.
 159                         // Instead we just log them.
 160                         MWExceptionHandler::logException( $e );
 161                 }
 162         }
 163 }