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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;
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 ];
}
/**
* @param int|false $ns
*/
private function isValidNS( $ns ): bool {
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()->getQueryValues(), $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
];
}
/**
* @param int|string $randstr
* @param string $fname
* @return \stdClass|false
*/
private function selectRandomPageFromDB( $randstr, string $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' );