InfoAction.php
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InfoAction.php
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	<?php
	/**
	* Displays information about a page.
	*
	* Copyright © 2011 Alexandre Emsenhuber
	*
	* 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
	*
	* @file
	* @ingroup Actions
	*/

	use MediaWiki\Cache\LinkBatchFactory;
	use MediaWiki\Category\Category;
	use MediaWiki\Content\ContentHandler;
	use MediaWiki\Context\IContextSource;
	use MediaWiki\EditPage\TemplatesOnThisPageFormatter;
	use MediaWiki\Html\Html;
	use MediaWiki\Language\Language;
	use MediaWiki\Languages\LanguageNameUtils;
	use MediaWiki\Linker\Linker;
	use MediaWiki\Linker\LinkRenderer;
	use MediaWiki\Linker\LinksMigration;
	use MediaWiki\MainConfigNames;
	use MediaWiki\MediaWikiServices;
	use MediaWiki\Message\Message;
	use MediaWiki\Page\PageIdentity;
	use MediaWiki\Page\PageProps;
	use MediaWiki\Page\RedirectLookup;
	use MediaWiki\Parser\MagicWordFactory;
	use MediaWiki\Parser\ParserOutput;
	use MediaWiki\Parser\Sanitizer;
	use MediaWiki\Permissions\RestrictionStore;
	use MediaWiki\Revision\RevisionLookup;
	use MediaWiki\Revision\RevisionRecord;
	use MediaWiki\SpecialPage\SpecialPage;
	use MediaWiki\Title\NamespaceInfo;
	use MediaWiki\Title\Title;
	use MediaWiki\User\UserFactory;
	use MediaWiki\Watchlist\WatchedItemStoreInterface;
	use Wikimedia\ObjectCache\WANObjectCache;
	use Wikimedia\Rdbms\Database;
	use Wikimedia\Rdbms\IConnectionProvider;
	use Wikimedia\Rdbms\IDBAccessObject;
	use Wikimedia\Rdbms\IExpression;
	use Wikimedia\Rdbms\LikeValue;

	/**
	* Displays information about a page.
	*
	* @ingroup Actions
	*/
	class InfoAction extends FormlessAction {
	private const VERSION = 1;

	private Language $contentLanguage;
	private LanguageNameUtils $languageNameUtils;
	private LinkBatchFactory $linkBatchFactory;
	private LinkRenderer $linkRenderer;
	private IConnectionProvider $dbProvider;
	private MagicWordFactory $magicWordFactory;
	private NamespaceInfo $namespaceInfo;
	private PageProps $pageProps;
	private RepoGroup $repoGroup;
	private RevisionLookup $revisionLookup;
	private WANObjectCache $wanObjectCache;
	private WatchedItemStoreInterface $watchedItemStore;
	private RedirectLookup $redirectLookup;
	private RestrictionStore $restrictionStore;
	private LinksMigration $linksMigration;
	private UserFactory $userFactory;

	public function __construct(
	Article $article,
	IContextSource $context,
	Language $contentLanguage,
	LanguageNameUtils $languageNameUtils,
	LinkBatchFactory $linkBatchFactory,
	LinkRenderer $linkRenderer,
	IConnectionProvider $dbProvider,
	MagicWordFactory $magicWordFactory,
	NamespaceInfo $namespaceInfo,
	PageProps $pageProps,
	RepoGroup $repoGroup,
	RevisionLookup $revisionLookup,
	WANObjectCache $wanObjectCache,
	WatchedItemStoreInterface $watchedItemStore,
	RedirectLookup $redirectLookup,
	RestrictionStore $restrictionStore,
	LinksMigration $linksMigration,
	UserFactory $userFactory
	) {
	parent::__construct( $article, $context );
	$this->contentLanguage = $contentLanguage;
	$this->languageNameUtils = $languageNameUtils;
	$this->linkBatchFactory = $linkBatchFactory;
	$this->linkRenderer = $linkRenderer;
	$this->dbProvider = $dbProvider;
	$this->magicWordFactory = $magicWordFactory;
	$this->namespaceInfo = $namespaceInfo;
	$this->pageProps = $pageProps;
	$this->repoGroup = $repoGroup;
	$this->revisionLookup = $revisionLookup;
	$this->wanObjectCache = $wanObjectCache;
	$this->watchedItemStore = $watchedItemStore;
	$this->redirectLookup = $redirectLookup;
	$this->restrictionStore = $restrictionStore;
	$this->linksMigration = $linksMigration;
	$this->userFactory = $userFactory;
	}

	/** @inheritDoc */
	public function getName() {
	return 'info';
	}

	/** @inheritDoc */
	public function requiresUnblock() {
	return false;
	}

	/** @inheritDoc */
	public function requiresWrite() {
	return false;
	}

	/**
	* Clear the info cache for a given Title.
	*
	* @since 1.22
	* @param PageIdentity $page Title to clear cache for
	* @param int\|null $revid Revision id to clear
	*/
	public static function invalidateCache( PageIdentity $page, $revid = null ) {
	$services = MediaWikiServices::getInstance();
	if ( $revid === null ) {
	$revision = $services->getRevisionLookup()
	->getRevisionByTitle( $page, 0, IDBAccessObject::READ_LATEST );
	$revid = $revision ? $revision->getId() : 0;
	}
	$cache = $services->getMainWANObjectCache();
	$key = self::getCacheKey( $cache, $page, $revid ?? 0 );
	$cache->delete( $key );
	}

	/**
	* Shows page information on GET request.
	*
	* @return string Page information that will be added to the output
	*/
	public function onView() {
	$this->getOutput()->addModuleStyles( [
	'mediawiki.interface.helpers.styles',
	'mediawiki.action.styles',
	] );

	// "Help" button
	$this->addHelpLink( 'Page information' );

	// Validate revision
	$oldid = $this->getArticle()->getOldID();
	if ( $oldid ) {
	$revRecord = $this->getArticle()->fetchRevisionRecord();

	if ( !$revRecord ) {
	return $this->msg( 'missing-revision', $oldid )->parse();
	} elseif ( !$revRecord->isCurrent() ) {
	return $this->msg( 'pageinfo-not-current' )->plain();
	}
	}

	// Page header
	$msg = $this->msg( 'pageinfo-header' );
	$content = $msg->isDisabled() ? '' : $msg->parse();

	// Get page information
	$pageInfo = $this->pageInfo();

	// Allow extensions to add additional information
	$this->getHookRunner()->onInfoAction( $this->getContext(), $pageInfo );

	// Render page information
	foreach ( $pageInfo as $header => $infoTable ) {
	// Messages:
	// pageinfo-header-basic, pageinfo-header-edits, pageinfo-header-restrictions,
	// pageinfo-header-properties, pageinfo-category-info
	$content .= $this->makeHeader(
	$this->msg( "pageinfo-$header" )->text(),
	"mw-pageinfo-$header"
	) . "\n";
	$rows = '';
	$below = "";
	foreach ( $infoTable as $infoRow ) {
	if ( $infoRow[0] == "below" ) {
	$below = $infoRow[1] . "\n";
	continue;
	}
	$name = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->escaped() : $infoRow[0];
	$value = ( $infoRow[1] instanceof Message ) ? $infoRow[1]->escaped() : $infoRow[1];
	$id = ( $infoRow[0] instanceof Message ) ? $infoRow[0]->getKey() : null;
	$rows .= $this->getRow( $name, $value, $id ) . "\n";
	}
	if ( $rows !== '' ) {
	$content .= Html::rawElement( 'table', [ 'class' => 'wikitable mw-page-info' ],
	"\n" . $rows );
	}
	$content .= "\n" . $below;
	}

	// Page footer
	if ( !$this->msg( 'pageinfo-footer' )->isDisabled() ) {
	$content .= $this->msg( 'pageinfo-footer' )->parse();
	}

	return $content;
	}

	/**
	* Creates a header that can be added to the output.
	*
	* @param string $header The header text.
	* @param string $canonicalId
	* @return string The HTML.
	*/
	private function makeHeader( $header, $canonicalId ) {
	return Html::rawElement(
	'h2',
	[ 'id' => Sanitizer::escapeIdForAttribute( $header ) ],
	Html::element(
	'span',
	[ 'id' => Sanitizer::escapeIdForAttribute( $canonicalId ) ],
	''
	) .
	htmlspecialchars( $header )
	);
	}

	/**
	* @param string $name The name of the row
	* @param string $value The value of the row
	* @param string\|null $id The ID to use for the 'tr' element
	* @param-taint $id none
	* @return string HTML
	*/
	private function getRow( $name, $value, $id ) {
	return Html::rawElement(
	'tr',
	[
	'id' => $id === null ? null : 'mw-' . $id,
	'style' => 'vertical-align: top;',
	],
	Html::rawElement( 'td', [], $name ) .
	Html::rawElement( 'td', [], $value )
	);
	}

	/**
	* Returns an array of info groups (will be rendered as tables), keyed by group ID.
	* Group IDs are arbitrary and used so that extensions may add additional information in
	* arbitrary positions (and as message keys for section headers for the tables, prefixed
	* with 'pageinfo-').
	* Each info group is a non-associative array of info items (rendered as table rows).
	* Each info item is an array with two elements: the first describes the type of
	* information, the second the value for the current page. Both can be strings (will be
	* interpreted as raw HTML) or messages (will be interpreted as plain text and escaped).
	*
	* @return array
	* @phan-return array<string, list<array{0:string\|Message, 1:string\|Message}>>
	*/
	private function pageInfo() {
	$user = $this->getUser();
	$lang = $this->getLanguage();
	$title = $this->getTitle();
	$id = $title->getArticleID();
	$config = $this->context->getConfig();
	$linkRenderer = $this->linkRenderer;

	$pageCounts = $this->pageCounts();

	$pageProperties = $this->pageProps->getAllProperties( $title )[$id] ?? [];

	// Basic information
	$pageInfo = [];
	$pageInfo['header-basic'] = [];

	// Display title
	$displayTitle = $pageProperties['displaytitle'] ??
	htmlspecialchars( $title->getPrefixedText(), ENT_NOQUOTES );

	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-display-title' ),
	$displayTitle
	];

	// Is it a redirect? If so, where to?
	$redirectTarget = $this->redirectLookup->getRedirectTarget( $this->getWikiPage() );
	if ( $redirectTarget !== null ) {
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-redirectsto' ),
	$linkRenderer->makeLink( $redirectTarget ) .
	$this->msg( 'word-separator' )->escaped() .
	$this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
	$redirectTarget,
	$this->msg( 'pageinfo-redirectsto-info' )->text(),
	[],
	[ 'action' => 'info' ]
	) )->escaped()
	];
	}

	// Default sort key
	$sortKey = $pageProperties['defaultsort'] ?? $title->getCategorySortkey();
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-default-sort' ),
	htmlspecialchars( $sortKey )
	];

	// Page length (in bytes)
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-length' ),
	$lang->formatNum( $title->getLength() )
	];

	// Page namespace
	$pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-namespace-id' ), $title->getNamespace() ];
	$pageNamespace = $title->getNsText();
	if ( $pageNamespace ) {
	$pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-namespace' ), $pageNamespace ];
	}

	// Page ID (number not localised, as it's a database ID)
	$pageInfo['header-basic'][] = [ $this->msg( 'pageinfo-article-id' ), $id ];

	// Language in which the page content is (supposed to be) written
	$pageLang = $title->getPageLanguage()->getCode();

	$pageLangHtml = $pageLang . ' - ' .
	$this->languageNameUtils->getLanguageName( $pageLang, $lang->getCode() );
	// Link to Special:PageLanguage with pre-filled page title if user has permissions
	if ( $config->get( MainConfigNames::PageLanguageUseDB )
	&& $this->getAuthority()->probablyCan( 'pagelang', $title )
	) {
	$pageLangHtml .= $this->msg( 'word-separator' )->escaped();
	$pageLangHtml .= $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
	SpecialPage::getTitleValueFor( 'PageLanguage', $title->getPrefixedText() ),
	$this->msg( 'pageinfo-language-change' )->text()
	) )->escaped();
	}

	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-language' )->escaped(),
	$pageLangHtml
	];

	// Content model of the page
	$modelHtml = htmlspecialchars( ContentHandler::getLocalizedName( $title->getContentModel() ) );
	// If the user can change it, add a link to Special:ChangeContentModel
	if ( $this->getAuthority()->probablyCan( 'editcontentmodel', $title ) ) {
	$modelHtml .= $this->msg( 'word-separator' )->escaped();
	$modelHtml .= $this->msg( 'parentheses' )->rawParams( $linkRenderer->makeLink(
	SpecialPage::getTitleValueFor( 'ChangeContentModel', $title->getPrefixedText() ),
	$this->msg( 'pageinfo-content-model-change' )->text()
	) )->escaped();
	}

	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-content-model' ),
	$modelHtml
	];

	if ( $title->inNamespace( NS_USER ) ) {
	$pageUser = $this->userFactory->newFromName( $title->getRootText() );
	if ( $pageUser && $pageUser->getId() && !$pageUser->isHidden() ) {
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-user-id' ),
	$pageUser->getId()
	];
	}
	}

	// Search engine status
	$parserOutput = new ParserOutput();
	if ( isset( $pageProperties['noindex'] ) ) {
	$parserOutput->setIndexPolicy( 'noindex' );
	}
	if ( isset( $pageProperties['index'] ) ) {
	$parserOutput->setIndexPolicy( 'index' );
	}

	// Use robot policy logic
	$policy = $this->getArticle()->getRobotPolicy( 'view', $parserOutput );
	$pageInfo['header-basic'][] = [
	// Messages: pageinfo-robot-index, pageinfo-robot-noindex
	$this->msg( 'pageinfo-robot-policy' ),
	$this->msg( "pageinfo-robot-{$policy['index']}" )
	];

	$unwatchedPageThreshold = $config->get( MainConfigNames::UnwatchedPageThreshold );
	if ( $this->getAuthority()->isAllowed( 'unwatchedpages' ) \|\|
	( $unwatchedPageThreshold !== false &&
	$pageCounts['watchers'] >= $unwatchedPageThreshold )
	) {
	// Number of page watchers
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-watchers' ),
	$lang->formatNum( $pageCounts['watchers'] )
	];

	$visiting = $pageCounts['visitingWatchers'] ?? null;
	if ( $visiting !== null && $config->get( MainConfigNames::ShowUpdatedMarker ) ) {
	if ( $visiting > $config->get( MainConfigNames::UnwatchedPageSecret ) \|\|
	$this->getAuthority()->isAllowed( 'unwatchedpages' )
	) {
	$value = $lang->formatNum( $visiting );
	} else {
	$value = $this->msg( 'pageinfo-few-visiting-watchers' );
	}
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-visiting-watchers' )
	->numParams( ceil( $config->get( MainConfigNames::WatchersMaxAge ) / 86400 ) ),
	$value
	];
	}
	} elseif ( $unwatchedPageThreshold !== false ) {
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-watchers' ),
	$this->msg( 'pageinfo-few-watchers' )->numParams( $unwatchedPageThreshold )
	];
	}

	// Redirects to this page
	$whatLinksHere = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedText() );
	$pageInfo['header-basic'][] = [
	$linkRenderer->makeLink(
	$whatLinksHere,
	$this->msg( 'pageinfo-redirects-name' )->text(),
	[],
	[
	'hidelinks' => 1,
	'hidetrans' => 1,
	'hideimages' => $title->getNamespace() === NS_FILE
	]
	),
	$this->msg( 'pageinfo-redirects-value' )
	->numParams( count( $title->getRedirectsHere() ) )
	];

	// Is it counted as a content page?
	if ( $this->getWikiPage()->isCountable() ) {
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-contentpage' ),
	$this->msg( 'pageinfo-contentpage-yes' )
	];
	}

	// Subpages of this page, if subpages are enabled for the current NS
	if ( $this->namespaceInfo->hasSubpages( $title->getNamespace() ) ) {
	$prefixIndex = SpecialPage::getTitleFor(
	'Prefixindex',
	$title->getPrefixedText() . '/'
	);
	$pageInfo['header-basic'][] = [
	$linkRenderer->makeLink(
	$prefixIndex,
	$this->msg( 'pageinfo-subpages-name' )->text()
	),
	// $wgNamespacesWithSubpages can be changed and this can be unset (T340749)
	isset( $pageCounts['subpages'] )
	? $this->msg( 'pageinfo-subpages-value' )->numParams(
	$pageCounts['subpages']['total'],
	$pageCounts['subpages']['redirects'],
	$pageCounts['subpages']['nonredirects']
	) : $this->msg( 'pageinfo-subpages-value-unknown' )->rawParams(
	$linkRenderer->makeKnownLink(
	$title, $this->msg( 'purge' )->text(), [], [ 'action' => 'purge' ] )
	)
	];
	}

	if ( $title->inNamespace( NS_CATEGORY ) ) {
	$category = Category::newFromTitle( $title );

	$allCount = $category->getMemberCount();
	$subcatCount = $category->getSubcatCount();
	$fileCount = $category->getFileCount();
	$pageCount = $category->getPageCount( Category::COUNT_CONTENT_PAGES );

	$pageInfo['category-info'] = [
	[
	$this->msg( 'pageinfo-category-total' ),
	$lang->formatNum( $allCount )
	],
	[
	$this->msg( 'pageinfo-category-pages' ),
	$lang->formatNum( $pageCount )
	],
	[
	$this->msg( 'pageinfo-category-subcats' ),
	$lang->formatNum( $subcatCount )
	],
	[
	$this->msg( 'pageinfo-category-files' ),
	$lang->formatNum( $fileCount )
	]
	];
	}

	// Display image SHA-1 value
	if ( $title->inNamespace( NS_FILE ) ) {
	$fileObj = $this->repoGroup->findFile( $title );
	if ( $fileObj !== false ) {
	// Convert the base-36 sha1 value obtained from database to base-16
	$output = Wikimedia\base_convert( $fileObj->getSha1(), 36, 16, 40 );
	$pageInfo['header-basic'][] = [
	$this->msg( 'pageinfo-file-hash' ),
	$output
	];
	}
	}

	// Page protection
	$pageInfo['header-restrictions'] = [];

	// Is this page affected by the cascading protection of something which includes it?
	if ( $this->restrictionStore->isCascadeProtected( $title ) ) {
	$cascadingFrom = '';
	$sources = $this->restrictionStore->getCascadeProtectionSources( $title )[0];

	foreach ( $sources as $sourcePageIdentity ) {
	$cascadingFrom .= Html::rawElement(
	'li',
	[],
	$linkRenderer->makeKnownLink( $sourcePageIdentity )
	);
	}

	$cascadingFrom = Html::rawElement( 'ul', [], $cascadingFrom );
	$pageInfo['header-restrictions'][] = [
	$this->msg( 'pageinfo-protect-cascading-from' ),
	$cascadingFrom
	];
	}

	// Is out protection set to cascade to other pages?
	if ( $this->restrictionStore->areRestrictionsCascading( $title ) ) {
	$pageInfo['header-restrictions'][] = [
	$this->msg( 'pageinfo-protect-cascading' ),
	$this->msg( 'pageinfo-protect-cascading-yes' )
	];
	}

	// Page protection
	foreach ( $this->restrictionStore->listApplicableRestrictionTypes( $title ) as $restrictionType ) {
	$protections = $this->restrictionStore->getRestrictions( $title, $restrictionType );

	switch ( count( $protections ) ) {
	case 0:
	$message = $this->getNamespaceProtectionMessage( $title ) ??
	// Allow all users by default
	$this->msg( 'protect-default' )->escaped();
	break;

	case 1:
	// Messages: protect-level-autoconfirmed, protect-level-sysop
	$message = $this->msg( 'protect-level-' . $protections[0] );
	if ( !$message->isDisabled() ) {
	$message = $message->escaped();
	break;
	}
	// Intentional fall-through if message is disabled (or non-existent)

	default:
	// Require "$1" permission
	$message = $this->msg( "protect-fallback", $lang->commaList( $protections ) )->parse();
	break;
	}
	$expiry = $this->restrictionStore->getRestrictionExpiry( $title, $restrictionType );
	$formattedexpiry = $expiry === null ? '' : $this->msg(
	'parentheses',
	$lang->formatExpiry( $expiry, true, 'infinity', $user )
	)->escaped();
	$message .= $this->msg( 'word-separator' )->escaped() . $formattedexpiry;

	// Messages: restriction-edit, restriction-move, restriction-create,
	// restriction-upload
	$pageInfo['header-restrictions'][] = [
	$this->msg( "restriction-$restrictionType" ), $message
	];
	}
	$protectLog = SpecialPage::getTitleFor( 'Log' );
	$pageInfo['header-restrictions'][] = [
	'below',
	$linkRenderer->makeKnownLink(
	$protectLog,
	$this->msg( 'pageinfo-view-protect-log' )->text(),
	[],
	[ 'type' => 'protect', 'page' => $title->getPrefixedText() ]
	),
	];

	if ( !$this->getWikiPage()->exists() ) {
	return $pageInfo;
	}

	// Edit history
	$pageInfo['header-edits'] = [];

	$firstRev = $this->revisionLookup->getFirstRevision( $this->getTitle() );
	$lastRev = $this->getWikiPage()->getRevisionRecord();
	$batch = $this->linkBatchFactory->newLinkBatch();
	if ( $firstRev ) {
	$firstRevUser = $firstRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
	if ( $firstRevUser ) {
	$batch->add( NS_USER, $firstRevUser->getName() );
	$batch->add( NS_USER_TALK, $firstRevUser->getName() );
	}
	}

	if ( $lastRev ) {
	$lastRevUser = $lastRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
	if ( $lastRevUser ) {
	$batch->add( NS_USER, $lastRevUser->getName() );
	$batch->add( NS_USER_TALK, $lastRevUser->getName() );
	}
	}

	$batch->execute();

	if ( $firstRev ) {
	// Page creator
	$firstRevUser = $firstRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
	// Check if the username is available – it may have been suppressed, in
	// which case use the invalid user name '[HIDDEN]' to get the wiki's
	// default user gender.
	$firstRevUserName = $firstRevUser ? $firstRevUser->getName() : '[HIDDEN]';
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-firstuser', $firstRevUserName ),
	Linker::revUserTools( $firstRev )
	];

	// Date of page creation
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-firsttime' ),
	$linkRenderer->makeKnownLink(
	$title,
	$lang->userTimeAndDate( $firstRev->getTimestamp(), $user ),
	[],
	[ 'oldid' => $firstRev->getId() ]
	)
	];
	}

	if ( $lastRev ) {
	// Latest editor
	$lastRevUser = $lastRev->getUser( RevisionRecord::FOR_THIS_USER, $user );
	// Check if the username is available – it may have been suppressed, in
	// which case use the invalid user name '[HIDDEN]' to get the wiki's
	// default user gender.
	$lastRevUserName = $lastRevUser ? $lastRevUser->getName() : '[HIDDEN]';
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-lastuser', $lastRevUserName ),
	Linker::revUserTools( $lastRev )
	];

	// Date of latest edit
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-lasttime' ),
	$linkRenderer->makeKnownLink(
	$title,
	$lang->userTimeAndDate( $this->getWikiPage()->getTimestamp(), $user ),
	[],
	[ 'oldid' => $this->getWikiPage()->getLatest() ]
	)
	];
	}

	// Total number of edits
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-edits' ),
	$lang->formatNum( $pageCounts['edits'] )
	];

	// Total number of distinct authors
	if ( $pageCounts['authors'] > 0 ) {
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-authors' ),
	$lang->formatNum( $pageCounts['authors'] )
	];
	}

	// Recent number of edits (within past 30 days)
	$pageInfo['header-edits'][] = [
	$this->msg(
	'pageinfo-recent-edits',
	$lang->formatDuration( $config->get( MainConfigNames::RCMaxAge ) )
	),
	$lang->formatNum( $pageCounts['recent_edits'] )
	];

	// Recent number of distinct authors
	$pageInfo['header-edits'][] = [
	$this->msg( 'pageinfo-recent-authors' ),
	$lang->formatNum( $pageCounts['recent_authors'] )
	];

	// Array of magic word IDs
	$wordIDs = $this->magicWordFactory->getDoubleUnderscoreArray()->getNames();

	// Array of IDs => localized magic words
	$localizedWords = $this->contentLanguage->getMagicWords();

	$listItems = [];
	foreach ( $pageProperties as $property => $value ) {
	if ( in_array( $property, $wordIDs ) ) {
	$listItems[] = Html::element( 'li', [], $localizedWords[$property][1] );
	}
	}

	$localizedList = Html::rawElement( 'ul', [], implode( '', $listItems ) );
	$hiddenCategories = $this->getWikiPage()->getHiddenCategories();

	if (
	count( $listItems ) > 0 \|\|
	count( $hiddenCategories ) > 0 \|\|
	$pageCounts['transclusion']['from'] > 0 \|\|
	$pageCounts['transclusion']['to'] > 0
	) {
	$options = [ 'LIMIT' => $config->get( MainConfigNames::PageInfoTransclusionLimit ) ];
	$transcludedTemplates = $title->getTemplateLinksFrom( $options );
	if ( $config->get( MainConfigNames::MiserMode ) ) {
	$transcludedTargets = [];
	} else {
	$transcludedTargets = $title->getTemplateLinksTo( $options );
	}

	// Page properties
	$pageInfo['header-properties'] = [];

	// Magic words
	if ( count( $listItems ) > 0 ) {
	$pageInfo['header-properties'][] = [
	$this->msg( 'pageinfo-magic-words' )->numParams( count( $listItems ) ),
	$localizedList
	];
	}

	// Hidden categories
	if ( count( $hiddenCategories ) > 0 ) {
	$pageInfo['header-properties'][] = [
	$this->msg( 'pageinfo-hidden-categories' )
	->numParams( count( $hiddenCategories ) ),
	Linker::formatHiddenCategories( $hiddenCategories )
	];
	}

	// Transcluded templates
	if ( $pageCounts['transclusion']['from'] > 0 ) {
	if ( $pageCounts['transclusion']['from'] > count( $transcludedTemplates ) ) {
	$more = $this->msg( 'morenotlisted' )->escaped();
	} else {
	$more = null;
	}

	$templateListFormatter = new TemplatesOnThisPageFormatter(
	$this->getContext(),
	$linkRenderer,
	$this->linkBatchFactory,
	$this->restrictionStore
	);

	$pageInfo['header-properties'][] = [
	$this->msg( 'pageinfo-templates' )
	->numParams( $pageCounts['transclusion']['from'] ),
	$templateListFormatter->format( $transcludedTemplates, false, $more )
	];
	}

	if ( !$config->get( MainConfigNames::MiserMode ) && $pageCounts['transclusion']['to'] > 0 ) {
	if ( $pageCounts['transclusion']['to'] > count( $transcludedTargets ) ) {
	$more = $linkRenderer->makeLink(
	$whatLinksHere,
	$this->msg( 'moredotdotdot' )->text(),
	[],
	[ 'hidelinks' => 1, 'hideredirs' => 1 ]
	);
	} else {
	$more = null;
	}

	$templateListFormatter = new TemplatesOnThisPageFormatter(
	$this->getContext(),
	$linkRenderer,
	$this->linkBatchFactory,
	$this->restrictionStore
	);

	$pageInfo['header-properties'][] = [
	$this->msg( 'pageinfo-transclusions' )
	->numParams( $pageCounts['transclusion']['to'] ),
	$templateListFormatter->format( $transcludedTargets, false, $more )
	];
	}
	}

	return $pageInfo;
	}

	/**
	* Get namespace protection message for title or null if no namespace protection
	* has been applied
	*
	* @param Title $title
	* @return ?string HTML
	*/
	private function getNamespaceProtectionMessage( Title $title ): ?string {
	$rights = [];
	if ( $title->isRawHtmlMessage() ) {
	$rights[] = 'editsitecss';
	$rights[] = 'editsitejs';
	} elseif ( $title->isSiteCssConfigPage() ) {
	$rights[] = 'editsitecss';
	} elseif ( $title->isSiteJsConfigPage() ) {
	$rights[] = 'editsitejs';
	} elseif ( $title->isSiteJsonConfigPage() ) {
	$rights[] = 'editsitejson';
	} elseif ( $title->isUserCssConfigPage() ) {
	$rights[] = 'editusercss';
	} elseif ( $title->isUserJsConfigPage() ) {
	$rights[] = 'edituserjs';
	} elseif ( $title->isUserJsonConfigPage() ) {
	$rights[] = 'edituserjson';
	} else {
	$namespaceProtection = $this->context->getConfig()->get( MainConfigNames::NamespaceProtection );
	$right = $namespaceProtection[$title->getNamespace()] ?? null;
	if ( $right ) {
	// a single string as the value is allowed as well as an array
	$rights = (array)$right;
	}
	}
	if ( $rights ) {
	return $this->msg( 'protect-fallback', $this->getLanguage()->commaList( $rights ) )->parse();
	} else {
	return null;
	}
	}

	/**
	* Returns page counts that would be too "expensive" to retrieve by normal means.
	*
	* @return array
	*/
	private function pageCounts() {
	$page = $this->getWikiPage();
	$fname = __METHOD__;
	$config = $this->context->getConfig();
	$cache = $this->wanObjectCache;

	return $cache->getWithSetCallback(
	self::getCacheKey( $cache, $page->getTitle(), $page->getLatest() ),
	WANObjectCache::TTL_WEEK,
	function ( $oldValue, &$ttl, &$setOpts ) use ( $page, $config, $fname ) {
	$title = $page->getTitle();
	$id = $title->getArticleID();

	$dbr = $this->dbProvider->getReplicaDatabase();
	$setOpts += Database::getCacheSetOptions( $dbr );

	$field = 'rev_actor';
	$pageField = 'rev_page';

	$watchedItemStore = $this->watchedItemStore;

	$result = [];
	$result['watchers'] = $watchedItemStore->countWatchers( $title );

	if ( $config->get( MainConfigNames::ShowUpdatedMarker ) ) {
	$updated = (int)wfTimestamp( TS_UNIX, $page->getTimestamp() );
	$result['visitingWatchers'] = $watchedItemStore->countVisitingWatchers(
	$title,
	$updated - $config->get( MainConfigNames::WatchersMaxAge )
	);
	}

	// Total number of edits
	$edits = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(*)' )
	->from( 'revision' )
	->where( [ 'rev_page' => $id ] )
	->caller( $fname )
	->fetchField();
	$result['edits'] = $edits;

	// Total number of distinct authors
	if ( $config->get( MainConfigNames::MiserMode ) ) {
	$result['authors'] = 0;
	} else {
	$result['authors'] = (int)$dbr->newSelectQueryBuilder()
	->select( "COUNT(DISTINCT $field)" )
	->from( 'revision' )
	->where( [ $pageField => $id ] )
	->caller( $fname )
	->fetchField();
	}

	// "Recent" threshold defined by RCMaxAge setting
	$threshold = $dbr->timestamp( time() - $config->get( MainConfigNames::RCMaxAge ) );

	// Recent number of edits
	$edits = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(rev_page)' )
	->from( 'revision' )
	->where( [ 'rev_page' => $id ] )
	->andWhere( $dbr->expr( 'rev_timestamp', '>=', $threshold ) )
	->caller( $fname )
	->fetchField();
	$result['recent_edits'] = $edits;

	// Recent number of distinct authors
	$result['recent_authors'] = (int)$dbr->newSelectQueryBuilder()
	->select( "COUNT(DISTINCT $field)" )
	->from( 'revision' )
	->where( [ $pageField => $id ] )
	->andWhere( [ $dbr->expr( 'rev_timestamp', '>=', $threshold ) ] )
	->caller( $fname )
	->fetchField();

	// Subpages (if enabled)
	if ( $this->namespaceInfo->hasSubpages( $title->getNamespace() ) ) {
	$conds = [ 'page_namespace' => $title->getNamespace() ];
	$conds[] = $dbr->expr(
	'page_title',
	IExpression::LIKE,
	new LikeValue( $title->getDBkey() . '/', $dbr->anyString() )
	);

	// Subpages of this page (redirects)
	$conds['page_is_redirect'] = 1;
	$result['subpages']['redirects'] = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(page_id)' )
	->from( 'page' )
	->where( $conds )
	->caller( $fname )
	->fetchField();
	// Subpages of this page (non-redirects)
	$conds['page_is_redirect'] = 0;
	$result['subpages']['nonredirects'] = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(page_id)' )
	->from( 'page' )
	->where( $conds )
	->caller( $fname )
	->fetchField();

	// Subpages of this page (total)
	$result['subpages']['total'] = $result['subpages']['redirects']
	+ $result['subpages']['nonredirects'];
	}

	// Counts for the number of transclusion links (to/from)
	if ( $config->get( MainConfigNames::MiserMode ) ) {
	$result['transclusion']['to'] = 0;
	} else {
	$result['transclusion']['to'] = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(tl_from)' )
	->from( 'templatelinks' )
	->where( $this->linksMigration->getLinksConditions( 'templatelinks', $title ) )
	->caller( $fname )
	->fetchField();
	}

	$result['transclusion']['from'] = (int)$dbr->newSelectQueryBuilder()
	->select( 'COUNT(*)' )
	->from( 'templatelinks' )
	->where( [ 'tl_from' => $title->getArticleID() ] )
	->caller( $fname )
	->fetchField();

	return $result;
	}
	);
	}

	/**
	* Returns the name that goes in the "<h1>" page title.
	*
	* @return string
	*/
	protected function getPageTitle() {
	return $this->msg( 'pageinfo-title' )->plaintextParams( $this->getTitle()->getPrefixedText() );
	}

	/**
	* Returns the description that goes below the "<h1>" tag.
	*
	* @return string
	*/
	protected function getDescription() {
	return '';
	}

	/**
	* @param WANObjectCache $cache
	* @param PageIdentity $page
	* @param int $revId
	* @return string
	*/
	protected static function getCacheKey( WANObjectCache $cache, PageIdentity $page, $revId ) {
	return $cache->makeKey( 'infoaction', md5( (string)$page ), $revId, self::VERSION );
	}
	}

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