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