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<?php
class DoubleRedirectJob extends Job {
var $reason, $redirTitle, $destTitleText;
static $user;
/**
* Insert jobs into the job queue to fix redirects to the given title
* @param string $type The reason for the fix, see message double-redirect-fixed-<reason>
* @param Title $redirTitle The title which has changed, redirects pointing to this title are fixed
*/
public static function fixRedirects( $reason, $redirTitle, $destTitle = false ) {
# Need to use the master to get the redirect table updated in the same transaction
$dbw = wfGetDB( DB_MASTER );
$res = $dbw->select(
array( 'redirect', 'page' ),
array( 'page_namespace', 'page_title' ),
array(
'page_id = rd_from',
'rd_namespace' => $redirTitle->getNamespace(),
'rd_title' => $redirTitle->getDBkey()
), __METHOD__ );
if ( !$res->numRows() ) {
return;
}
$jobs = array();
foreach ( $res as $row ) {
$title = Title::makeTitle( $row->page_namespace, $row->page_title );
if ( !$title ) {
continue;
}
$jobs[] = new self( $title, array(
'reason' => $reason,
'redirTitle' => $redirTitle->getPrefixedDBkey() ) );
# Avoid excessive memory usage
if ( count( $jobs ) > 10000 ) {
Job::batchInsert( $jobs );
$jobs = array();
}
}
Job::batchInsert( $jobs );
}
function __construct( $title, $params = false, $id = 0 ) {
parent::__construct( 'fixDoubleRedirect', $title, $params, $id );
$this->reason = $params['reason'];
$this->redirTitle = Title::newFromText( $params['redirTitle'] );
$this->destTitleText = !empty( $params['destTitle'] ) ? $params['destTitle'] : '';
}
function run() {
if ( !$this->redirTitle ) {
$this->setLastError( 'Invalid title' );
return false;
}
$targetRev = Revision::newFromTitle( $this->title );
if ( !$targetRev ) {
wfDebug( __METHOD__.": target redirect already deleted, ignoring\n" );
return true;
}
$text = $targetRev->getText();
$currentDest = Title::newFromRedirect( $text );
if ( !$currentDest || !$currentDest->equals( $this->redirTitle ) ) {
wfDebug( __METHOD__.": Redirect has changed since the job was queued\n" );
return true;
}
# Check for a suppression tag (used e.g. in periodically archived discussions)
$mw = MagicWord::get( 'staticredirect' );
if ( $mw->match( $text ) ) {
wfDebug( __METHOD__.": skipping: suppressed with __STATICREDIRECT__\n" );
return true;
}
# Find the current final destination
$newTitle = self::getFinalDestination( $this->redirTitle );
if ( !$newTitle ) {
wfDebug( __METHOD__.": skipping: single redirect, circular redirect or invalid redirect destination\n" );
return true;
}
if ( $newTitle->equals( $this->redirTitle ) ) {
# The redirect is already right, no need to change it
# This can happen if the page was moved back (say after vandalism)
wfDebug( __METHOD__.": skipping, already good\n" );
}
# Preserve fragment (bug 14904)
$newTitle = Title::makeTitle( $newTitle->getNamespace(), $newTitle->getDBkey(),
$currentDest->getFragment() );
# Fix the text
# Remember that redirect pages can have categories, templates, etc.,
# so the regex has to be fairly general
$newText = preg_replace( '/ \[ \[ [^\]]* \] \] /x',
'[[' . $newTitle->getFullText() . ']]',
$text, 1 );
if ( $newText === $text ) {
$this->setLastError( 'Text unchanged???' );
return false;
}
# Save it
global $wgUser;
$oldUser = $wgUser;
$wgUser = $this->getUser();
$article = new Article( $this->title );
$reason = wfMsgForContent( 'double-redirect-fixed-' . $this->reason,
$this->redirTitle->getPrefixedText(), $newTitle->getPrefixedText() );
$article->doEdit( $newText, $reason, EDIT_UPDATE | EDIT_SUPPRESS_RC );
$wgUser = $oldUser;
return true;
}
/**
* Get the final destination of a redirect
* Returns false if the specified title is not a redirect, or if it is a circular redirect
*/
public static function getFinalDestination( $title ) {
$dbw = wfGetDB( DB_MASTER );
$seenTitles = array(); # Circular redirect check
$dest = false;
while ( true ) {
$titleText = $title->getPrefixedDBkey();
if ( isset( $seenTitles[$titleText] ) ) {
wfDebug( __METHOD__, "Circular redirect detected, aborting\n" );
return false;
}
$seenTitles[$titleText] = true;
$row = $dbw->selectRow(
array( 'redirect', 'page' ),
array( 'rd_namespace', 'rd_title' ),
array(
'rd_from=page_id',
'page_namespace' => $title->getNamespace(),
'page_title' => $title->getDBkey()
), __METHOD__ );
if ( !$row ) {
# No redirect from here, chain terminates
break;
} else {
$dest = $title = Title::makeTitle( $row->rd_namespace, $row->rd_title );
}
}
return $dest;
}
/**
* Get a user object for doing edits, from a request-lifetime cache
*/
function getUser() {
if ( !self::$user ) {
self::$user = User::newFromName( wfMsgForContent( 'double-redirect-fixer' ), false );
if ( !self::$user->isLoggedIn() ) {
self::$user->addToDatabase();
}
}
return self::$user;
}
}
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