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<?php
/**
* 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
* @author Derick Alangi
*/
namespace MediaWiki\Page;
use MediaWiki\FileRepo\RepoGroup;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleParser;
use MediaWiki\Title\TitleValue;
use Psr\Log\LoggerInterface;
use Wikimedia\MapCacheLRU\MapCacheLRU;
use Wikimedia\Rdbms\IConnectionProvider;
/**
* Service for storing and retrieving page redirect information.
*
* @unstable
* @since 1.38
*/
class RedirectStore implements RedirectLookup {
private IConnectionProvider $dbProvider;
private PageLookup $pageLookup;
private TitleParser $titleParser;
private RepoGroup $repoGroup;
private LoggerInterface $logger;
private MapCacheLRU $procCache;
public function __construct(
IConnectionProvider $dbProvider,
PageLookup $pageLookup,
TitleParser $titleParser,
RepoGroup $repoGroup,
LoggerInterface $logger
) {
$this->dbProvider = $dbProvider;
$this->pageLookup = $pageLookup;
$this->titleParser = $titleParser;
$this->repoGroup = $repoGroup;
$this->logger = $logger;
// Must be 500+ for QueryPage and Pager uses to be effective
$this->procCache = new MapCacheLRU( 1_000 );
}
public function getRedirectTarget( PageIdentity $page ): ?LinkTarget {
$cacheKey = self::makeCacheKey( $page );
$cachedValue = $this->procCache->get( $cacheKey );
if ( $cachedValue !== null ) {
return $cachedValue ?: null;
}
// Handle redirects for files included from foreign image repositories.
if ( $page->getNamespace() === NS_FILE ) {
$file = $this->repoGroup->findFile( $page );
if ( $file && !$file->isLocal() ) {
$from = $file->getRedirected();
$to = $file->getName();
if ( $from === null || $from === $to ) {
$this->procCache->set( $cacheKey, false );
return null;
}
$target = new TitleValue( NS_FILE, $to );
$this->procCache->set( $cacheKey, $target );
return $target;
}
}
$page = $this->pageLookup->getPageByReference( $page );
if ( $page === null || !$page->isRedirect() ) {
$this->procCache->set( $cacheKey, false );
return null;
}
$dbr = $this->dbProvider->getReplicaDatabase();
$row = $dbr->newSelectQueryBuilder()
->select( [ 'rd_namespace', 'rd_title', 'rd_fragment', 'rd_interwiki' ] )
->from( 'redirect' )
->where( [ 'rd_from' => $page->getId() ] )
->caller( __METHOD__ )
->fetchRow();
if ( !$row ) {
$this->logger->info(
'Found inconsistent redirect status; probably the page was deleted after it was loaded'
);
$this->procCache->set( $cacheKey, false );
return null;
}
$target = $this->createRedirectTarget(
$row->rd_namespace,
$row->rd_title,
$row->rd_fragment,
$row->rd_interwiki
);
$this->procCache->set( $cacheKey, $target );
return $target;
}
/**
* Update the redirect target for a page.
*
* @param PageIdentity $page The page to update the redirect target for.
* @param LinkTarget|null $target The new redirect target, or `null` if this is not a redirect.
* @param bool|null $lastRevWasRedirect Whether the last revision was a redirect, or `null`
* if not known. If set, this allows eliding writes to the redirect table.
*
* @return bool `true` on success, `false` on failure.
*/
public function updateRedirectTarget(
PageIdentity $page,
?LinkTarget $target,
?bool $lastRevWasRedirect = null
) {
// Always update redirects (target link might have changed)
// Update/Insert if we don't know if the last revision was a redirect or not
// Delete if changing from redirect to non-redirect
$isRedirect = $target !== null;
$cacheKey = self::makeCacheKey( $page );
if ( !$isRedirect && $lastRevWasRedirect === false ) {
$this->procCache->set( $cacheKey, false );
return true;
}
if ( $isRedirect ) {
$rt = Title::newFromLinkTarget( $target );
if ( !$rt->isValidRedirectTarget() ) {
// Don't put a bad redirect into the database (T278367)
$this->procCache->set( $cacheKey, false );
return false;
}
$dbw = $this->dbProvider->getPrimaryDatabase();
$dbw->startAtomic( __METHOD__ );
$truncatedFragment = self::truncateFragment( $rt->getFragment() );
$dbw->newInsertQueryBuilder()
->insertInto( 'redirect' )
->row( [
'rd_from' => $page->getId(),
'rd_namespace' => $rt->getNamespace(),
'rd_title' => $rt->getDBkey(),
'rd_fragment' => $truncatedFragment,
'rd_interwiki' => $rt->getInterwiki(),
] )
->onDuplicateKeyUpdate()
->uniqueIndexFields( [ 'rd_from' ] )
->set( [
'rd_namespace' => $rt->getNamespace(),
'rd_title' => $rt->getDBkey(),
'rd_fragment' => $truncatedFragment,
'rd_interwiki' => $rt->getInterwiki(),
] )
->caller( __METHOD__ )
->execute();
$dbw->endAtomic( __METHOD__ );
$this->procCache->set(
$cacheKey,
$this->createRedirectTarget(
$rt->getNamespace(),
$rt->getDBkey(),
$truncatedFragment,
$rt->getInterwiki()
)
);
} else {
$dbw = $this->dbProvider->getPrimaryDatabase();
// This is not a redirect, remove row from redirect table
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'redirect' )
->where( [ 'rd_from' => $page->getId() ] )
->caller( __METHOD__ )
->execute();
$this->procCache->set( $cacheKey, false );
}
if ( $page->getNamespace() === NS_FILE ) {
$this->repoGroup->getLocalRepo()->invalidateImageRedirect( $page );
}
return true;
}
/**
* Clear process-cached redirect information for a page.
*
* @param LinkTarget|PageIdentity $page The page to clear the cache for.
* @return void
*/
public function clearCache( $page ) {
$this->procCache->clear( self::makeCacheKey( $page ) );
}
/**
* Create a process cache key for the given page.
* @param LinkTarget|PageIdentity $page The page to create a cache key for.
* @return string Cache key.
*/
private static function makeCacheKey( $page ) {
return "{$page->getNamespace()}:{$page->getDBkey()}";
}
/**
* Create a LinkTarget appropriate for use as a redirect target.
*
* @param int $namespace The namespace of the article
* @param string $title Database key form
* @param string $fragment The link fragment (after the "#")
* @param string $interwiki Interwiki prefix
*
* @return LinkTarget|null `LinkTarget`, or `null` if this is not a valid redirect
*/
private function createRedirectTarget( $namespace, $title, $fragment, $interwiki ): ?LinkTarget {
// (T203942) We can't redirect to Media namespace because it's virtual.
// We don't want to modify Title objects farther down the
// line. So, let's fix this here by changing to File namespace.
if ( $namespace == NS_MEDIA ) {
$namespace = NS_FILE;
}
// mimic behaviour of self::insertRedirectEntry for fragments that didn't
// come from the redirect table
$fragment = self::truncateFragment( $fragment );
// T261347: be defensive when fetching data from the redirect table.
// Use Title::makeTitleSafe(), and if that returns null, ignore the
// row. In an ideal world, the DB would be cleaned up after a
// namespace change, but nobody could be bothered to do that.
$target = $this->titleParser->makeTitleValueSafe( $namespace, $title, $fragment, $interwiki );
if ( $target !== null && Title::newFromLinkTarget( $target )->isValidRedirectTarget() ) {
return $target;
}
return null;
}
/**
* Truncate link fragment to maximum storable value
*
* @param string $fragment The link fragment (after the "#")
* @return string
*/
private static function truncateFragment( $fragment ) {
return mb_strcut( $fragment, 0, 255 );
}
}