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-rw-r--r--includes/job/DoubleRedirectJob.php178
1 files changed, 178 insertions, 0 deletions
diff --git a/includes/job/DoubleRedirectJob.php b/includes/job/DoubleRedirectJob.php
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--- /dev/null
+++ b/includes/job/DoubleRedirectJob.php
@@ -0,0 +1,178 @@
+<?php
+/**
+ * Job to fix double redirects after moving a page
+ *
+ * @file
+ * @ingroup JobQueue
+ */
+
+/**
+ * Job to fix double redirects after moving a page
+ *
+ * @ingroup JobQueue
+ */
+class DoubleRedirectJob extends Job {
+ var $reason, $redirTitle, $destTitleText;
+ static $user;
+
+ /**
+ * Insert jobs into the job queue to fix redirects to the given title
+ * @param $reason String: the reason for the fix, see message double-redirect-fixed-<reason>
+ * @param $redirTitle Title: the title which has changed, redirects pointing to this title are fixed
+ * @param $destTitle Not used
+ */
+ 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
+ * @return 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;
+ }
+}
+