Localisation updates from https://translatewiki.net.

[mediawiki.git] / includes / actions / InfoAction.php

<?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 );
        }
}