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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
*/
namespace MediaWiki\Specials;
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Content\IContentHandlerFactory;
use MediaWiki\Skin\Skin;
use MediaWiki\SpecialPage\QueryPage;
use MediaWiki\Title\Title;
use stdClass;
use Wikimedia\Rdbms\IConnectionProvider;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IResultWrapper;
/**
* List of redirects to non-existent pages.
*
* Editors are encouraged to fix these by editing them to redirect to
* an existing page instead.
*
* How it works, from a performance perspective:
*
* 1. Identify source pages,
* in doQuery (cached for MiserMode wikis).
*
* 2. Render source links,
* in formatResult(). Pages may change between cache and now, and
* LinkRenderer doesn't know anyway, so we batch preload page info
* for all source pages in preprocessResults(),
* consumed by LinkRenderer calls in formatResult().
*
* 3. Identify redirect destination.
* For uncached, this happens in doQuery() by adding extra fields.
* For MiserMode, the redirect target is loaded from database
* and added to the batch as well.
*
* 4. Render destination links,
* in formatResult(). Pages may change between cache and now.
* So we batch preload page for all destination pages in
* preprocessResults(), consumed by LinkRenderer in formatResult().
*
* @ingroup SpecialPage
*/
class SpecialBrokenRedirects extends QueryPage {
private IContentHandlerFactory $contentHandlerFactory;
/** @var array<int,array<string,Title>> namespace and title map to redirect targets */
private array $redirectTargets = [];
public function __construct(
IContentHandlerFactory $contentHandlerFactory,
IConnectionProvider $dbProvider,
LinkBatchFactory $linkBatchFactory
) {
parent::__construct( 'BrokenRedirects' );
$this->contentHandlerFactory = $contentHandlerFactory;
$this->setDatabaseProvider( $dbProvider );
$this->setLinkBatchFactory( $linkBatchFactory );
}
public function isExpensive() {
return true;
}
public function isSyndicated() {
return false;
}
protected function sortDescending() {
return false;
}
protected function getPageHeader() {
return $this->msg( 'brokenredirectstext' )->parseAsBlock();
}
public function getQueryInfo() {
$dbr = $this->getDatabaseProvider()->getReplicaDatabase();
return [
'tables' => [
'redirect',
'p1' => 'page',
'p2' => 'page',
],
'fields' => [
'namespace' => 'p1.page_namespace',
'title' => 'p1.page_title',
'rd_namespace',
'rd_title',
'rd_fragment',
],
'conds' => [
// Exclude pages that don't exist locally as wiki pages, but aren't "broken" either: special
// pages and interwiki links.
$dbr->expr( 'rd_namespace', '>=', 0 ),
'rd_interwiki' => '',
'p2.page_namespace' => null,
],
'join_conds' => [
'p1' => [ 'JOIN', [
'rd_from=p1.page_id',
] ],
'p2' => [ 'LEFT JOIN', [
'rd_namespace=p2.page_namespace',
'rd_title=p2.page_title'
] ],
],
];
}
/**
* @return array
*/
protected function getOrderFields() {
return [ 'rd_namespace', 'rd_title', 'rd_from' ];
}
/**
* Preload LinkRenderer for source and destination
*
* @param IDatabase $db
* @param IResultWrapper $res
*/
public function preprocessResults( $db, $res ) {
if ( !$res->numRows() ) {
return;
}
$batch = $this->getLinkBatchFactory()->newLinkBatch()->setCaller( __METHOD__ );
$cached = $this->isCached();
foreach ( $res as $row ) {
// Preload LinkRenderer data for source links
$batch->add( $row->namespace, $row->title );
if ( !$cached ) {
// Preload LinkRenderer data for destination links
$batch->add( $row->rd_namespace, $row->rd_title );
}
}
if ( $cached ) {
// Preload redirect targets and LinkRenderer data for destination links
$rdRes = $db->newSelectQueryBuilder()
->select( [ 'page_namespace', 'page_title', 'rd_namespace', 'rd_title', 'rd_fragment' ] )
->from( 'page' )
->join( 'redirect', null, 'page_id = rd_from' )
->where( $batch->constructSet( 'page', $db ) )
->caller( __METHOD__ )
->fetchResultSet();
foreach ( $rdRes as $rdRow ) {
$batch->add( $rdRow->rd_namespace, $rdRow->rd_title );
$this->redirectTargets[$rdRow->page_namespace][$rdRow->page_title] =
Title::makeTitle( $rdRow->rd_namespace, $rdRow->rd_title, $rdRow->rd_fragment );
}
}
$batch->execute();
// Rewind for display
$res->seek( 0 );
}
protected function getRedirectTarget( stdClass $result ): ?Title {
if ( isset( $result->rd_title ) ) {
return Title::makeTitle(
$result->rd_namespace,
$result->rd_title,
$result->rd_fragment
);
} else {
return $this->redirectTargets[$result->namespace][$result->title] ?? null;
}
}
/**
* @param Skin $skin
* @param \stdClass $result Result row
* @return string
*/
public function formatResult( $skin, $result ) {
$fromObj = Title::makeTitle( $result->namespace, $result->title );
$toObj = $this->getRedirectTarget( $result );
$linkRenderer = $this->getLinkRenderer();
if ( $toObj === null || $toObj->exists() ) {
return '<del>' . $linkRenderer->makeLink( $fromObj ) . '</del>';
}
$from = $linkRenderer->makeKnownLink(
$fromObj,
null,
[],
[ 'redirect' => 'no' ]
);
$links = [];
// if the page is editable, add an edit link
if (
// check user permissions
$this->getAuthority()->isAllowed( 'edit' ) &&
// check, if the content model is editable through action=edit
$this->contentHandlerFactory->getContentHandler( $fromObj->getContentModel() )
->supportsDirectEditing()
) {
$links[] = $linkRenderer->makeKnownLink(
$fromObj,
$this->msg( 'brokenredirects-edit' )->text(),
[],
[ 'action' => 'edit' ]
);
}
$to = $linkRenderer->makeBrokenLink( $toObj, $toObj->getFullText() );
$arr = $this->getLanguage()->getArrow();
$out = $from . $this->msg( 'word-separator' )->escaped();
if ( $this->getAuthority()->isAllowed( 'delete' ) ) {
$links[] = $linkRenderer->makeKnownLink(
$fromObj,
$this->msg( 'brokenredirects-delete' )->text(),
[],
[
'action' => 'delete',
'wpReason' => $this->msg( 'brokenredirects-delete-reason' )
->inContentLanguage()
->text()
]
);
}
if ( $links ) {
$out .= $this->msg( 'parentheses' )->rawParams( $this->getLanguage()
->pipeList( $links ) )->escaped();
}
$out .= " {$arr} {$to}";
return $out;
}
public function execute( $par ) {
$this->addHelpLink( 'Help:Redirects' );
parent::execute( $par );
}
protected function getGroupName() {
return 'maintenance';
}
}
/** @deprecated class alias since 1.41 */
class_alias( SpecialBrokenRedirects::class, 'SpecialBrokenRedirects' );