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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\SpecialPage\SpecialPage; use MediaWiki\Title\NamespaceInfo; use MediaWiki\Title\Title; use Wikimedia\Rdbms\IConnectionProvider; /** * Redirect to a random page * * @ingroup SpecialPage * @author Rob Church <robchur@gmail.com>, Ilmari Karonen */ class SpecialRandomPage extends SpecialPage { /** @var int[] namespaces to select pages from */ private $namespaces; /** @var bool should the result be a redirect? */ protected $isRedir = false; /** @var array Extra SQL statements */ protected $extra = []; private IConnectionProvider $dbProvider; /** * @param IConnectionProvider $dbProvider * @param NamespaceInfo $nsInfo */ public function __construct( IConnectionProvider $dbProvider, NamespaceInfo $nsInfo ) { parent::__construct( 'Randompage' ); $this->dbProvider = $dbProvider; $this->namespaces = $nsInfo->getContentNamespaces(); } public function getNamespaces() { return $this->namespaces; } public function setNamespace( $ns ) { if ( !$this->isValidNS( $ns ) ) { $ns = NS_MAIN; } $this->namespaces = [ $ns ]; } private function isValidNS( $ns ) { return $ns !== false && $ns >= 0; } // select redirects instead of normal pages? public function isRedirect() { return $this->isRedir; } public function execute( $par ) { $this->parsePar( $par ); $title = $this->getRandomTitle(); if ( $title === null ) { $this->setHeaders(); // Message: randompage-nopages, randomredirect-nopages $this->getOutput()->addWikiMsg( strtolower( $this->getName() ) . '-nopages', $this->getNsList(), count( $this->namespaces ) ); return; } $redirectParam = $this->isRedirect() ? [ 'redirect' => 'no' ] : []; $query = array_merge( $this->getRequest()->getValues(), $redirectParam ); unset( $query['title'] ); $this->getOutput()->redirect( $title->getFullURL( $query ) ); } /** * Parse the subpage parameter that specifies namespaces * * @param string $par Subpage to special page */ private function parsePar( $par ) { // Testing for stringiness since we want to catch // the empty string to mean main namespace only. if ( is_string( $par ) ) { $ns = $this->getContentLanguage()->getNsIndex( $par ); if ( $ns === false && strpos( $par, ',' ) !== false ) { $nsList = []; // Comma separated list $parSplit = explode( ',', $par ); foreach ( $parSplit as $potentialNs ) { $ns = $this->getContentLanguage()->getNsIndex( $potentialNs ); if ( $this->isValidNS( $ns ) ) { $nsList[] = $ns; } // Remove duplicate values, and re-index array $nsList = array_unique( $nsList ); $nsList = array_values( $nsList ); if ( $nsList !== [] ) { $this->namespaces = $nsList; } } } else { // Note, that the case of $par being something // like "main" which is not a namespace, falls // through to here, and sets NS_MAIN, allowing // Special:Random/main or Special:Random/article // to work as expected. $this->setNamespace( $this->getContentLanguage()->getNsIndex( $par ) ); } } } /** * Get a comma-delimited list of namespaces we don't have * any pages in * @return string */ private function getNsList() { $contLang = $this->getContentLanguage(); $nsNames = []; foreach ( $this->namespaces as $n ) { if ( $n === NS_MAIN ) { $nsNames[] = $this->msg( 'blanknamespace' )->plain(); } else { $nsNames[] = $contLang->getNsText( $n ); } } return $contLang->commaList( $nsNames ); } /** * Choose a random title. * @return Title|null Title object (or null if nothing to choose from) */ public function getRandomTitle() { $randstr = wfRandom(); $title = null; if ( !$this->getHookRunner()->onSpecialRandomGetRandomTitle( $randstr, $this->isRedir, $this->namespaces, // @phan-suppress-next-line PhanTypeMismatchArgument Type mismatch on pass-by-ref args $this->extra, $title ) ) { return $title; } $row = $this->selectRandomPageFromDB( $randstr, __METHOD__ ); /* If we picked a value that was higher than any in * the DB, wrap around and select the page with the * lowest value instead! One might think this would * skew the distribution, but in fact it won't cause * any more bias than what the page_random scheme * causes anyway. Trust me, I'm a mathematician. :) */ if ( !$row ) { $row = $this->selectRandomPageFromDB( 0, __METHOD__ ); } if ( $row ) { return Title::makeTitleSafe( $row->page_namespace, $row->page_title ); } return null; } protected function getQueryInfo( $randstr ) { $dbr = $this->dbProvider->getReplicaDatabase(); $redirect = $this->isRedirect() ? 1 : 0; $tables = [ 'page' ]; $conds = array_merge( [ 'page_namespace' => $this->namespaces, 'page_is_redirect' => $redirect, $dbr->expr( 'page_random', '>=', $randstr ), ], $this->extra ); $joinConds = []; // Allow extensions to modify the query $this->getHookRunner()->onRandomPageQuery( $tables, $conds, $joinConds ); return [ 'tables' => $tables, 'fields' => [ 'page_title', 'page_namespace' ], 'conds' => $conds, 'options' => [ 'ORDER BY' => 'page_random', 'LIMIT' => 1, ], 'join_conds' => $joinConds ]; } private function selectRandomPageFromDB( $randstr, $fname ) { $dbr = $this->dbProvider->getReplicaDatabase(); $query = $this->getQueryInfo( $randstr ); return $dbr->newSelectQueryBuilder() ->queryInfo( $query ) ->caller( $fname ) ->fetchRow(); } protected function getGroupName() { return 'redirects'; } } /** * Retain the old class name for backwards compatibility. * @deprecated since 1.41 */ class_alias( SpecialRandomPage::class, 'SpecialRandomPage' );
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