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[mediawiki.git] / includes / specials / SpecialDoubleRedirects.php

<?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\Html\Html;
use MediaWiki\SpecialPage\QueryPage;
use MediaWiki\Title\Title;
use Skin;
use stdClass;
use Wikimedia\Rdbms\IConnectionProvider;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IResultWrapper;

/**
 * List of redirects to another redirecting page.
 *
 * The software will by default not follow double redirects, to prevent loops.
 * Editors are encouraged to fix these, and can discover them via this page.
 *
 * @ingroup SpecialPage
 */
class SpecialDoubleRedirects extends QueryPage {

        private IContentHandlerFactory $contentHandlerFactory;
        private LinkBatchFactory $linkBatchFactory;

        /**
         * @param IContentHandlerFactory $contentHandlerFactory
         * @param LinkBatchFactory $linkBatchFactory
         * @param IConnectionProvider $dbProvider
         */
        public function __construct(
                IContentHandlerFactory $contentHandlerFactory,
                LinkBatchFactory $linkBatchFactory,
                IConnectionProvider $dbProvider
        ) {
                parent::__construct( 'DoubleRedirects' );
                $this->contentHandlerFactory = $contentHandlerFactory;
                $this->linkBatchFactory = $linkBatchFactory;
                $this->setDatabaseProvider( $dbProvider );
        }

        public function isExpensive() {
                return true;
        }

        public function isSyndicated() {
                return false;
        }

        protected function sortDescending() {
                return false;
        }

        protected function getPageHeader() {
                return $this->msg( 'doubleredirectstext' )->parseAsBlock();
        }

        private function reallyGetQueryInfo( $namespace = null, $title = null ) {
                $limitToTitle = !( $namespace === null && $title === null );
                $retval = [
                        'tables' => [
                                'ra' => 'redirect',
                                'rb' => 'redirect',
                                'pa' => 'page',
                                'pb' => 'page'
                        ],
                        'fields' => [
                                'namespace' => 'pa.page_namespace',
                                'title' => 'pa.page_title',

                                'b_namespace' => 'pb.page_namespace',
                                'b_title' => 'pb.page_title',
                                'b_fragment' => 'ra.rd_fragment',

                                // Select fields from redirect instead of page. Because there may
                                // not actually be a page table row for this target (e.g. for interwiki redirects)
                                'c_namespace' => 'rb.rd_namespace',
                                'c_title' => 'rb.rd_title',
                                'c_fragment' => 'rb.rd_fragment',
                                'c_interwiki' => 'rb.rd_interwiki',
                        ],
                        'conds' => [
                                'ra.rd_from = pa.page_id',

                                // Filter out redirects where the target goes interwiki (T42353).
                                // This isn't an optimization, it is required for correct results,
                                // otherwise a non-double redirect like Bar -> w:Foo will show up
                                // like "Bar -> Foo -> w:Foo".
                                'ra.rd_interwiki' => '',

                                'pb.page_namespace = ra.rd_namespace',
                                'pb.page_title = ra.rd_title',

                                'rb.rd_from = pb.page_id',
                        ]
                ];

                if ( $limitToTitle ) {
                        $retval['conds']['pa.page_namespace'] = $namespace;
                        $retval['conds']['pa.page_title'] = $title;
                }

                return $retval;
        }

        public function getQueryInfo() {
                return $this->reallyGetQueryInfo();
        }

        protected function getOrderFields() {
                return [ 'ra.rd_namespace', 'ra.rd_title' ];
        }

        /**
         * @param Skin $skin
         * @param stdClass $result Result row
         * @return string
         */
        public function formatResult( $skin, $result ) {
                // If no Title B or C is in the query, it means this came from
                // querycache (which only saves the 3 columns for title A).
                // That does save the bulk of the query cost, but now we need to
                // get a little more detail about each individual entry quickly
                // using the filter of reallyGetQueryInfo.
                $deep = false;
                if ( $result ) {
                        if ( isset( $result->b_namespace ) ) {
                                $deep = $result;
                        } else {
                                $qi = $this->reallyGetQueryInfo(
                                        $result->namespace,
                                        $result->title
                                );
                                $deep = $this->getDatabaseProvider()->getReplicaDatabase()->newSelectQueryBuilder()
                                        ->queryInfo( $qi )
                                        ->caller( __METHOD__ )
                                        ->fetchRow();
                        }
                }

                $titleA = Title::makeTitle( $result->namespace, $result->title );

                $linkRenderer = $this->getLinkRenderer();
                if ( !$deep ) {
                        return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
                }

                // 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( $titleA->getContentModel() )
                                ->supportsDirectEditing()
                ) {
                        $edit = $linkRenderer->makeKnownLink(
                                $titleA,
                                $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(),
                                [],
                                [ 'action' => 'edit' ]
                        );
                } else {
                        $edit = '';
                }

                $arrow = $this->getLanguage()->getArrow();
                $contentLanguage = $this->getContentLanguage();
                $bdiAttrs = [
                        'dir' => $contentLanguage->getDir(),
                        'lang' => $contentLanguage->getHtmlCode(),
                ];
                $linkA = Html::rawElement( 'bdi', $bdiAttrs, $linkRenderer->makeKnownLink(
                        $titleA,
                        null,
                        [],
                        [ 'redirect' => 'no' ]
                ) );

                $titleB = Title::makeTitle( $deep->b_namespace, $deep->b_title );
                // We show fragment, but don't link to it, as it probably doesn't exist anymore.
                $titleBFrag = Title::makeTitle( $deep->b_namespace, $deep->b_title, $deep->b_fragment );
                $linkB = Html::rawElement( 'bdi', $bdiAttrs, $linkRenderer->makeKnownLink(
                        $titleB,
                        $titleBFrag->getFullText(),
                        [],
                        [ 'redirect' => 'no' ]
                ) );

                $titleC = Title::makeTitle(
                        $deep->c_namespace,
                        $deep->c_title,
                        $deep->c_fragment,
                        $deep->c_interwiki
                );
                $linkC = Html::rawElement( 'bdi', $bdiAttrs,
                        $linkRenderer->makeKnownLink( $titleC, $titleC->getFullText() )
                );

                return ( "{$linkA} {$edit} {$arrow} {$linkB} {$arrow} {$linkC}" );
        }

        public function execute( $par ) {
                $this->addHelpLink( 'Help:Redirects' );
                parent::execute( $par );
        }

        /**
         * Cache page content model and gender distinction for performance
         *
         * @param IDatabase $db
         * @param IResultWrapper $res
         */
        public function preprocessResults( $db, $res ) {
                if ( !$res->numRows() ) {
                        return;
                }

                $batch = $this->linkBatchFactory->newLinkBatch();
                foreach ( $res as $row ) {
                        $batch->add( $row->namespace, $row->title );
                        if ( isset( $row->b_namespace ) ) {
                                // lazy loaded when using cached results
                                $batch->add( $row->b_namespace, $row->b_title );
                        }
                        if ( isset( $row->c_interwiki ) && !$row->c_interwiki ) {
                                // lazy loaded when using cached result, not added when interwiki link
                                $batch->add( $row->c_namespace, $row->c_title );
                        }
                }
                $batch->execute();

                // Back to start for display
                $res->seek( 0 );
        }

        protected function getGroupName() {
                return 'maintenance';
        }
}

/** @deprecated class alias since 1.41 */
class_alias( SpecialDoubleRedirects::class, 'SpecialDoubleRedirects' );