00001 <?php 00002 00003 class DoubleRedirectJob extends Job { 00004 var $reason, $redirTitle, $destTitleText; 00005 static $user; 00006 00012 public static function fixRedirects( $reason, $redirTitle, $destTitle = false ) { 00013 # Need to use the master to get the redirect table updated in the same transaction 00014 $dbw = wfGetDB( DB_MASTER ); 00015 $res = $dbw->select( 00016 array( 'redirect', 'page' ), 00017 array( 'page_namespace', 'page_title' ), 00018 array( 00019 'page_id = rd_from', 00020 'rd_namespace' => $redirTitle->getNamespace(), 00021 'rd_title' => $redirTitle->getDBkey() 00022 ), __METHOD__ ); 00023 if ( !$res->numRows() ) { 00024 return; 00025 } 00026 $jobs = array(); 00027 foreach ( $res as $row ) { 00028 $title = Title::makeTitle( $row->page_namespace, $row->page_title ); 00029 if ( !$title ) { 00030 continue; 00031 } 00032 00033 $jobs[] = new self( $title, array( 00034 'reason' => $reason, 00035 'redirTitle' => $redirTitle->getPrefixedDBkey() ) ); 00036 # Avoid excessive memory usage 00037 if ( count( $jobs ) > 10000 ) { 00038 Job::batchInsert( $jobs ); 00039 $jobs = array(); 00040 } 00041 } 00042 Job::batchInsert( $jobs ); 00043 } 00044 function __construct( $title, $params = false, $id = 0 ) { 00045 parent::__construct( 'fixDoubleRedirect', $title, $params, $id ); 00046 $this->reason = $params['reason']; 00047 $this->redirTitle = Title::newFromText( $params['redirTitle'] ); 00048 $this->destTitleText = !empty( $params['destTitle'] ) ? $params['destTitle'] : ''; 00049 } 00050 00051 function run() { 00052 if ( !$this->redirTitle ) { 00053 $this->setLastError( 'Invalid title' ); 00054 return false; 00055 } 00056 00057 $targetRev = Revision::newFromTitle( $this->title ); 00058 if ( !$targetRev ) { 00059 wfDebug( __METHOD__.": target redirect already deleted, ignoring\n" ); 00060 return true; 00061 } 00062 $text = $targetRev->getText(); 00063 $currentDest = Title::newFromRedirect( $text ); 00064 if ( !$currentDest || !$currentDest->equals( $this->redirTitle ) ) { 00065 wfDebug( __METHOD__.": Redirect has changed since the job was queued\n" ); 00066 return true; 00067 } 00068 00069 # Check for a suppression tag (used e.g. in periodically archived discussions) 00070 $mw = MagicWord::get( 'staticredirect' ); 00071 if ( $mw->match( $text ) ) { 00072 wfDebug( __METHOD__.": skipping: suppressed with __STATICREDIRECT__\n" ); 00073 return true; 00074 } 00075 00076 # Find the current final destination 00077 $newTitle = self::getFinalDestination( $this->redirTitle ); 00078 if ( !$newTitle ) { 00079 wfDebug( __METHOD__.": skipping: single redirect, circular redirect or invalid redirect destination\n" ); 00080 return true; 00081 } 00082 if ( $newTitle->equals( $this->redirTitle ) ) { 00083 # The redirect is already right, no need to change it 00084 # This can happen if the page was moved back (say after vandalism) 00085 wfDebug( __METHOD__.": skipping, already good\n" ); 00086 } 00087 00088 # Preserve fragment (bug 14904) 00089 $newTitle = Title::makeTitle( $newTitle->getNamespace(), $newTitle->getDBkey(), 00090 $currentDest->getFragment() ); 00091 00092 # Fix the text 00093 # Remember that redirect pages can have categories, templates, etc., 00094 # so the regex has to be fairly general 00095 $newText = preg_replace( '/ \[ \[ [^\]]* \] \] /x', 00096 '[[' . $newTitle->getFullText() . ']]', 00097 $text, 1 ); 00098 00099 if ( $newText === $text ) { 00100 $this->setLastError( 'Text unchanged???' ); 00101 return false; 00102 } 00103 00104 # Save it 00105 global $wgUser; 00106 $oldUser = $wgUser; 00107 $wgUser = $this->getUser(); 00108 $article = new Article( $this->title ); 00109 $reason = wfMsgForContent( 'double-redirect-fixed-' . $this->reason, 00110 $this->redirTitle->getPrefixedText(), $newTitle->getPrefixedText() ); 00111 $article->doEdit( $newText, $reason, EDIT_UPDATE | EDIT_SUPPRESS_RC ); 00112 $wgUser = $oldUser; 00113 00114 return true; 00115 } 00116 00121 public static function getFinalDestination( $title ) { 00122 $dbw = wfGetDB( DB_MASTER ); 00123 00124 $seenTitles = array(); # Circular redirect check 00125 $dest = false; 00126 00127 while ( true ) { 00128 $titleText = $title->getPrefixedDBkey(); 00129 if ( isset( $seenTitles[$titleText] ) ) { 00130 wfDebug( __METHOD__, "Circular redirect detected, aborting\n" ); 00131 return false; 00132 } 00133 $seenTitles[$titleText] = true; 00134 00135 $row = $dbw->selectRow( 00136 array( 'redirect', 'page' ), 00137 array( 'rd_namespace', 'rd_title' ), 00138 array( 00139 'rd_from=page_id', 00140 'page_namespace' => $title->getNamespace(), 00141 'page_title' => $title->getDBkey() 00142 ), __METHOD__ ); 00143 if ( !$row ) { 00144 # No redirect from here, chain terminates 00145 break; 00146 } else { 00147 $dest = $title = Title::makeTitle( $row->rd_namespace, $row->rd_title ); 00148 } 00149 } 00150 return $dest; 00151 } 00152 00156 function getUser() { 00157 if ( !self::$user ) { 00158 self::$user = User::newFromName( wfMsgForContent( 'double-redirect-fixer' ), false ); 00159 if ( !self::$user->isLoggedIn() ) { 00160 self::$user->addToDatabase(); 00161 } 00162 } 00163 return self::$user; 00164 } 00165 } 00166