--- /dev/null
+<?php
+/**
+ * Job to fix double redirects after moving a page.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup JobQueue
+ */
+
+/**
+ * Job to fix double redirects after moving a page
+ *
+ * @ingroup JobQueue
+ */
+class DoubleRedirectJob extends Job {
+ /** @var string Reason for the change, 'maintenance' or 'move'. Suffix fo
+ * message key 'double-redirect-fixed-'.
+ */
+ private $reason;
+
+ /** @var Title The title which has changed, redirects pointing to this
+ * title are fixed
+ */
+ private $redirTitle;
+
+ /** @var User */
+ private static $user;
+
+ /**
+ * @param Title $title
+ * @param array $params
+ */
+ function __construct( Title $title, array $params ) {
+ parent::__construct( 'fixDoubleRedirect', $title, $params );
+ $this->reason = $params['reason'];
+ $this->redirTitle = Title::newFromText( $params['redirTitle'] );
+ }
+
+ /**
+ * Insert jobs into the job queue to fix redirects to the given title
+ * @param string $reason 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
+ * @param bool $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(
+ [ 'redirect', 'page' ],
+ [ 'page_namespace', 'page_title' ],
+ [
+ 'page_id = rd_from',
+ 'rd_namespace' => $redirTitle->getNamespace(),
+ 'rd_title' => $redirTitle->getDBkey()
+ ], __METHOD__ );
+ if ( !$res->numRows() ) {
+ return;
+ }
+ $jobs = [];
+ foreach ( $res as $row ) {
+ $title = Title::makeTitle( $row->page_namespace, $row->page_title );
+ if ( !$title ) {
+ continue;
+ }
+
+ $jobs[] = new self( $title, [
+ 'reason' => $reason,
+ 'redirTitle' => $redirTitle->getPrefixedDBkey() ] );
+ # Avoid excessive memory usage
+ if ( count( $jobs ) > 10000 ) {
+ JobQueueGroup::singleton()->push( $jobs );
+ $jobs = [];
+ }
+ }
+ JobQueueGroup::singleton()->push( $jobs );
+ }
+
+ /**
+ * @return bool
+ */
+ function run() {
+ if ( !$this->redirTitle ) {
+ $this->setLastError( 'Invalid title' );
+
+ return false;
+ }
+
+ $targetRev = Revision::newFromTitle( $this->title, false, Revision::READ_LATEST );
+ if ( !$targetRev ) {
+ wfDebug( __METHOD__ . ": target redirect already deleted, ignoring\n" );
+
+ return true;
+ }
+ $content = $targetRev->getContent();
+ $currentDest = $content ? $content->getRedirectTarget() : null;
+ if ( !$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 ( $content->matchMagicWord( $mw ) ) {
+ 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 (T16904)
+ $newTitle = Title::makeTitle( $newTitle->getNamespace(), $newTitle->getDBkey(),
+ $currentDest->getFragment(), $newTitle->getInterwiki() );
+
+ // Fix the text
+ $newContent = $content->updateRedirect( $newTitle );
+
+ if ( $newContent->equals( $content ) ) {
+ $this->setLastError( 'Content unchanged???' );
+
+ return false;
+ }
+
+ $user = $this->getUser();
+ if ( !$user ) {
+ $this->setLastError( 'Invalid user' );
+
+ return false;
+ }
+
+ // Save it
+ global $wgUser;
+ $oldUser = $wgUser;
+ $wgUser = $user;
+ $article = WikiPage::factory( $this->title );
+
+ // Messages: double-redirect-fixed-move, double-redirect-fixed-maintenance
+ $reason = wfMessage( 'double-redirect-fixed-' . $this->reason,
+ $this->redirTitle->getPrefixedText(), $newTitle->getPrefixedText()
+ )->inContentLanguage()->text();
+ $flags = EDIT_UPDATE | EDIT_SUPPRESS_RC | EDIT_INTERNAL;
+ $article->doEditContent( $newContent, $reason, $flags, false, $user );
+ $wgUser = $oldUser;
+
+ return true;
+ }
+
+ /**
+ * Get the final destination of a redirect
+ *
+ * @param Title $title
+ *
+ * @return Title|bool The final Title after following all redirects, or false if
+ * the page is not a redirect or the redirect loops.
+ */
+ public static function getFinalDestination( $title ) {
+ $dbw = wfGetDB( DB_MASTER );
+
+ // Circular redirect check
+ $seenTitles = [];
+ $dest = false;
+
+ while ( true ) {
+ $titleText = $title->getPrefixedDBkey();
+ if ( isset( $seenTitles[$titleText] ) ) {
+ wfDebug( __METHOD__, "Circular redirect detected, aborting\n" );
+
+ return false;
+ }
+ $seenTitles[$titleText] = true;
+
+ if ( $title->isExternal() ) {
+ // If the target is interwiki, we have to break early (T42352).
+ // Otherwise it will look up a row in the local page table
+ // with the namespace/page of the interwiki target which can cause
+ // unexpected results (e.g. X -> foo:Bar -> Bar -> .. )
+ break;
+ }
+
+ $row = $dbw->selectRow(
+ [ 'redirect', 'page' ],
+ [ 'rd_namespace', 'rd_title', 'rd_interwiki' ],
+ [
+ '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,
+ '',
+ $row->rd_interwiki
+ );
+ }
+ }
+
+ return $dest;
+ }
+
+ /**
+ * Get a user object for doing edits, from a request-lifetime cache
+ * False will be returned if the user name specified in the
+ * 'double-redirect-fixer' message is invalid.
+ *
+ * @return User|bool
+ */
+ function getUser() {
+ if ( !self::$user ) {
+ $username = wfMessage( 'double-redirect-fixer' )->inContentLanguage()->text();
+ self::$user = User::newFromName( $username );
+ # User::newFromName() can return false on a badly configured wiki.
+ if ( self::$user && !self::$user->isLoggedIn() ) {
+ self::$user->addToDatabase();
+ }
+ }
+
+ return self::$user;
+ }
+}
scripts.mit.edu / autoinstallsdev / mediawiki.git / blobdiff